1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * lash -- the BusyBox Lame-Ass SHell
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | *
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7 | * Based in part on ladsh.c by Michael K. Johnson and Erik W. Troan, which is
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8 | * under the following liberal license: "We have placed this source code in the
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9 | * public domain. Use it in any project, free or commercial."
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10 | *
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11 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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12 | */
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13 |
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14 | /* This shell's parsing engine is officially at a dead-end. Future
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15 | * work shell work should be done using hush, msh, or ash. This is
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16 | * still a very useful, small shell -- it just don't need any more
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17 | * features beyond what it already has...
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18 | */
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19 |
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20 | //For debugging/development on the shell only...
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21 | //#define DEBUG_SHELL
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22 |
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23 | #include <getopt.h>
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24 | #include <glob.h>
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25 |
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26 | #include "busybox.h" /* for struct bb_applet */
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27 |
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28 | #define expand_t glob_t
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29 |
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30 | /* Always enable for the moment... */
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31 | #define CONFIG_LASH_PIPE_N_REDIRECTS
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32 | #define CONFIG_LASH_JOB_CONTROL
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33 | #define ENABLE_LASH_PIPE_N_REDIRECTS 1
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34 | #define ENABLE_LASH_JOB_CONTROL 1
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35 |
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36 |
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37 | enum { MAX_READ = 128 }; /* size of input buffer for 'read' builtin */
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38 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
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39 |
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40 |
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41 | #if ENABLE_LASH_PIPE_N_REDIRECTS
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42 | enum redir_type { REDIRECT_INPUT, REDIRECT_OVERWRITE,
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43 | REDIRECT_APPEND
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44 | };
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45 | #endif
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46 |
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47 | enum {
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48 | DEFAULT_CONTEXT = 0x1,
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49 | IF_TRUE_CONTEXT = 0x2,
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50 | IF_FALSE_CONTEXT = 0x4,
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51 | THEN_EXP_CONTEXT = 0x8,
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52 | ELSE_EXP_CONTEXT = 0x10
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53 | };
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54 |
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55 | #define LASH_OPT_DONE (1)
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56 | #define LASH_OPT_SAW_QUOTE (2)
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57 |
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58 | #if ENABLE_LASH_PIPE_N_REDIRECTS
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59 | struct redir_struct {
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60 | enum redir_type type; /* type of redirection */
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61 | int fd; /* file descriptor being redirected */
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62 | char *filename; /* file to redirect fd to */
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63 | };
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64 | #endif
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65 |
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66 | struct child_prog {
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67 | pid_t pid; /* 0 if exited */
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68 | char **argv; /* program name and arguments */
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69 | int num_redirects; /* elements in redirection array */
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70 | int is_stopped; /* is the program currently running? */
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71 | struct job *family; /* pointer back to the child's parent job */
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72 | #if ENABLE_LASH_PIPE_N_REDIRECTS
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73 | struct redir_struct *redirects; /* I/O redirects */
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74 | #endif
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75 | };
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76 |
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77 | struct jobset {
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78 | struct job *head; /* head of list of running jobs */
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79 | struct job *fg; /* current foreground job */
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80 | };
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81 |
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82 | struct job {
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83 | int jobid; /* job number */
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84 | int num_progs; /* total number of programs in job */
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85 | int running_progs; /* number of programs running */
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86 | char *text; /* name of job */
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87 | char *cmdbuf; /* buffer various argv's point into */
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88 | pid_t pgrp; /* process group ID for the job */
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89 | struct child_prog *progs; /* array of programs in job */
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90 | struct job *next; /* to track background commands */
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91 | int stopped_progs; /* number of programs alive, but stopped */
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92 | unsigned int job_context; /* bitmask defining current context */
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93 | struct jobset *job_list;
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94 | };
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95 |
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96 | struct built_in_command {
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97 | const char *cmd; /* name */
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98 | const char *descr; /* description */
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99 | int (*function) (struct child_prog *); /* function ptr */
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100 | };
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101 |
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102 | /* function prototypes for builtins */
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103 | static int builtin_cd(struct child_prog *cmd);
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104 | static int builtin_exec(struct child_prog *cmd);
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105 | static int builtin_exit(struct child_prog *cmd);
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106 | static int builtin_fg_bg(struct child_prog *cmd);
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107 | static int builtin_help(struct child_prog *cmd);
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108 | static int builtin_jobs(struct child_prog *dummy);
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109 | static int builtin_pwd(struct child_prog *dummy);
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110 | static int builtin_export(struct child_prog *cmd);
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111 | static int builtin_source(struct child_prog *cmd);
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112 | static int builtin_unset(struct child_prog *cmd);
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113 | static int builtin_read(struct child_prog *cmd);
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114 |
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115 |
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116 | /* function prototypes for shell stuff */
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117 | static void checkjobs(struct jobset *job_list);
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118 | static void remove_job(struct jobset *j_list, struct job *job);
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119 | static int get_command_bufsiz(FILE * source, char *command);
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120 | static int parse_command(char **command_ptr, struct job *job, int *inbg);
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121 | static int run_command(struct job *newjob, int inbg, int outpipe[2]);
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122 | static int pseudo_exec(struct child_prog *cmd) ATTRIBUTE_NORETURN;
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123 | static int busy_loop(FILE * input);
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124 |
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125 |
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126 | /* Table of built-in functions (these are non-forking builtins, meaning they
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127 | * can change global variables in the parent shell process but they will not
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128 | * work with pipes and redirects; 'unset foo | whatever' will not work) */
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129 | static const struct built_in_command bltins[] = {
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130 | {"bg" , "Resume a job in the background", builtin_fg_bg},
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131 | {"cd" , "Change working directory", builtin_cd},
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132 | {"exec" , "Exec command, replacing this shell with the exec'd process", builtin_exec},
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133 | {"exit" , "Exit from shell()", builtin_exit},
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134 | {"fg" , "Bring job into the foreground", builtin_fg_bg},
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135 | {"jobs" , "Lists the active jobs", builtin_jobs},
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136 | {"export", "Set environment variable", builtin_export},
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137 | {"unset" , "Unset environment variable", builtin_unset},
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138 | {"read" , "Input environment variable", builtin_read},
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139 | {"." , "Source-in and run commands in a file", builtin_source},
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140 | /* These were "forked applets", but distinction was nuked */
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141 | /* Original comment retained: */
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142 | /* Table of forking built-in functions (things that fork cannot change global
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143 | * variables in the parent process, such as the current working directory) */
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144 | {"pwd" , "Print current directory", builtin_pwd},
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145 | {"help" , "List shell built-in commands", builtin_help},
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146 | /* to do: add ulimit */
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147 | };
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148 |
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149 |
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150 | #define VEC_LAST(v) v[ARRAY_SIZE(v)-1]
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151 |
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152 |
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153 | static int shell_context; /* Type prompt trigger (PS1 or PS2) */
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154 |
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155 |
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156 | /* Globals that are static to this file */
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157 | static char *cwd;
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158 | static char *local_pending_command;
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159 | static struct jobset job_list = { NULL, NULL };
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160 | static int argc;
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161 | static char **argv;
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162 | static llist_t *close_me_list;
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163 | static int last_return_code;
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164 | static int last_bg_pid;
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165 | static unsigned int last_jobid;
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166 | static int shell_terminal;
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167 | static const char *PS1;
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168 | static const char *PS2 = "> ";
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169 |
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170 |
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171 | #ifdef DEBUG_SHELL
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172 | static inline void debug_printf(const char *format, ...)
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173 | {
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174 | va_list args;
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175 | va_start(args, format);
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176 | vfprintf(stderr, format, args);
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177 | va_end(args);
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178 | }
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179 | #else
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180 | static inline void debug_printf(const char ATTRIBUTE_UNUSED *format, ...) { }
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181 | #endif
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182 |
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183 | /*
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184 | Most builtins need access to the struct child_prog that has
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185 | their arguments, previously coded as cmd->progs[0]. That coding
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186 | can exhibit a bug, if the builtin is not the first command in
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187 | a pipeline: "echo foo | exec sort" will attempt to exec foo.
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188 |
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189 | builtin previous use notes
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190 | ------ ----------------- ---------
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191 | cd cmd->progs[0]
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192 | exec cmd->progs[0] squashed bug: didn't look for applets or forking builtins
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193 | exit cmd->progs[0]
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194 | fg_bg cmd->progs[0], job_list->head, job_list->fg
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195 | help 0
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196 | jobs job_list->head
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197 | pwd 0
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198 | export cmd->progs[0]
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199 | source cmd->progs[0]
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200 | unset cmd->progs[0]
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201 | read cmd->progs[0]
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202 |
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203 | I added "struct job *family;" to struct child_prog,
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204 | and switched API to builtin_foo(struct child_prog *child);
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205 | So cmd->text becomes child->family->text
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206 | cmd->job_context becomes child->family->job_context
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207 | cmd->progs[0] becomes *child
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208 | job_list becomes child->family->job_list
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209 | */
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210 |
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211 |
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212 | static void update_cwd(void)
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213 | {
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214 | cwd = xrealloc_getcwd_or_warn(cwd);
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215 | if (!cwd)
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216 | cwd = xstrdup(bb_msg_unknown);
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217 | }
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218 |
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219 | /* built-in 'cd <path>' handler */
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220 | static int builtin_cd(struct child_prog *child)
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221 | {
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222 | char *newdir;
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223 |
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224 | if (child->argv[1] == NULL)
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225 | newdir = getenv("HOME");
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226 | else
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227 | newdir = child->argv[1];
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228 | if (chdir(newdir)) {
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229 | bb_perror_msg("cd: %s", newdir);
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230 | return EXIT_FAILURE;
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231 | }
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232 | update_cwd();
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233 | return EXIT_SUCCESS;
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234 | }
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235 |
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236 | /* built-in 'exec' handler */
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237 | static int builtin_exec(struct child_prog *child)
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238 | {
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239 | if (child->argv[1] == NULL)
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240 | return EXIT_SUCCESS; /* Really? */
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241 | child->argv++;
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242 | while (close_me_list)
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243 | close((long)llist_pop(&close_me_list));
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244 | pseudo_exec(child);
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245 | /* never returns */
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246 | }
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247 |
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248 | /* built-in 'exit' handler */
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249 | static int builtin_exit(struct child_prog *child)
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250 | {
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251 | if (child->argv[1] == NULL)
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252 | exit(EXIT_SUCCESS);
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253 |
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254 | exit(atoi(child->argv[1]));
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255 | }
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256 |
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257 | /* built-in 'fg' and 'bg' handler */
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258 | static int builtin_fg_bg(struct child_prog *child)
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259 | {
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260 | int i, jobnum;
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261 | struct job *job;
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262 |
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263 | /* If they gave us no args, assume they want the last backgrounded task */
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264 | if (!child->argv[1]) {
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265 | for (job = child->family->job_list->head; job; job = job->next) {
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266 | if (job->jobid == last_jobid) {
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267 | goto found;
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268 | }
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269 | }
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270 | bb_error_msg("%s: no current job", child->argv[0]);
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271 | return EXIT_FAILURE;
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272 | }
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273 | if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
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274 | bb_error_msg(bb_msg_invalid_arg, child->argv[1], child->argv[0]);
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275 | return EXIT_FAILURE;
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276 | }
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277 | for (job = child->family->job_list->head; job; job = job->next) {
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278 | if (job->jobid == jobnum) {
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279 | goto found;
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280 | }
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281 | }
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282 | bb_error_msg("%s: %d: no such job", child->argv[0], jobnum);
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283 | return EXIT_FAILURE;
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284 | found:
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285 | if (*child->argv[0] == 'f') {
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286 | /* Put the job into the foreground. */
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287 | tcsetpgrp(shell_terminal, job->pgrp);
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288 |
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289 | child->family->job_list->fg = job;
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290 | }
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291 |
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292 | /* Restart the processes in the job */
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293 | for (i = 0; i < job->num_progs; i++)
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294 | job->progs[i].is_stopped = 0;
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295 |
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296 | job->stopped_progs = 0;
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297 |
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298 | i = kill(- job->pgrp, SIGCONT);
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299 | if (i < 0) {
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300 | if (errno == ESRCH) {
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301 | remove_job(&job_list, job);
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302 | } else {
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303 | bb_perror_msg("kill (SIGCONT)");
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304 | }
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305 | }
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306 |
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307 | return EXIT_SUCCESS;
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308 | }
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309 |
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310 | /* built-in 'help' handler */
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311 | static int builtin_help(struct child_prog ATTRIBUTE_UNUSED *dummy)
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312 | {
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313 | const struct built_in_command *x;
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314 |
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315 | printf("\nBuilt-in commands:\n"
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316 | "-------------------\n");
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317 | for (x = bltins; x <= &VEC_LAST(bltins); x++) {
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318 | if (x->descr == NULL)
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319 | continue;
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320 | printf("%s\t%s\n", x->cmd, x->descr);
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321 | }
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322 | putchar('\n');
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323 | return EXIT_SUCCESS;
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324 | }
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325 |
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326 | /* built-in 'jobs' handler */
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327 | static int builtin_jobs(struct child_prog *child)
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328 | {
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329 | struct job *job;
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330 | const char *status_string;
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331 |
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332 | for (job = child->family->job_list->head; job; job = job->next) {
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333 | if (job->running_progs == job->stopped_progs)
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334 | status_string = "Stopped";
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335 | else
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336 | status_string = "Running";
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337 |
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338 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
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339 | }
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340 | return EXIT_SUCCESS;
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341 | }
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342 |
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343 |
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344 | /* built-in 'pwd' handler */
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345 | static int builtin_pwd(struct child_prog ATTRIBUTE_UNUSED *dummy)
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346 | {
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347 | update_cwd();
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348 | puts(cwd);
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349 | return EXIT_SUCCESS;
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350 | }
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351 |
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352 | /* built-in 'export VAR=value' handler */
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353 | static int builtin_export(struct child_prog *child)
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354 | {
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355 | int res;
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356 | char *v = child->argv[1];
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357 |
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358 | if (v == NULL) {
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359 | char **e;
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360 | for (e = environ; *e; e++) {
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361 | puts(*e);
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362 | }
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363 | return 0;
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364 | }
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365 | res = putenv(v);
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366 | if (res)
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367 | bb_perror_msg("export");
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368 | #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
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369 | if (strncmp(v, "PS1=", 4) == 0)
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370 | PS1 = getenv("PS1");
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371 | #endif
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372 |
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373 | #if ENABLE_LOCALE_SUPPORT
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374 | // TODO: why getenv? "" would be just as good...
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375 | if (strncmp(v, "LC_ALL=", 7) == 0)
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376 | setlocale(LC_ALL, getenv("LC_ALL"));
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377 | if (strncmp(v, "LC_CTYPE=", 9) == 0)
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378 | setlocale(LC_CTYPE, getenv("LC_CTYPE"));
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379 | #endif
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380 |
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381 | return res;
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382 | }
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383 |
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384 | /* built-in 'read VAR' handler */
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385 | static int builtin_read(struct child_prog *child)
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386 | {
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387 | int res = 0, len;
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388 | char *s;
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389 | char string[MAX_READ];
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390 |
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391 | if (child->argv[1]) {
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392 | /* argument (VAR) given: put "VAR=" into buffer */
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393 | safe_strncpy(string, child->argv[1], MAX_READ-1);
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394 | len = strlen(string);
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395 | string[len++] = '=';
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396 | string[len] = '\0';
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397 | fgets(&string[len], sizeof(string) - len, stdin); /* read string */
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398 | res = strlen(string);
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399 | if (res > len)
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400 | string[--res] = '\0'; /* chomp trailing newline */
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401 | /*
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402 | ** string should now contain "VAR=<value>"
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403 | ** copy it (putenv() won't do that, so we must make sure
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404 | ** the string resides in a static buffer!)
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405 | */
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406 | res = -1;
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407 | s = strdup(string);
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408 | if (s)
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409 | res = putenv(s);
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410 | if (res)
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411 | bb_perror_msg("read");
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412 | } else
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413 | fgets(string, sizeof(string), stdin);
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414 |
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415 | return res;
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416 | }
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417 |
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418 | /* Built-in '.' handler (read-in and execute commands from file) */
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419 | static int builtin_source(struct child_prog *child)
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420 | {
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421 | FILE *input;
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422 | int status;
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423 |
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424 | input = fopen_or_warn(child->argv[1], "r");
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425 | if (!input) {
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426 | return EXIT_FAILURE;
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427 | }
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428 |
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429 | llist_add_to(&close_me_list, (void *)(long)fileno(input));
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430 | /* Now run the file */
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431 | status = busy_loop(input);
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432 | fclose(input);
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433 | llist_pop(&close_me_list);
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434 | return status;
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435 | }
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436 |
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437 | /* built-in 'unset VAR' handler */
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438 | static int builtin_unset(struct child_prog *child)
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439 | {
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440 | if (child->argv[1] == NULL) {
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441 | printf(bb_msg_requires_arg, "unset");
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442 | return EXIT_FAILURE;
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443 | }
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444 | unsetenv(child->argv[1]);
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445 | return EXIT_SUCCESS;
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446 | }
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447 |
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448 | #if ENABLE_LASH_JOB_CONTROL
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449 | /* free up all memory from a job */
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450 | static void free_job(struct job *cmd)
|
---|
451 | {
|
---|
452 | int i;
|
---|
453 | struct jobset *keep;
|
---|
454 |
|
---|
455 | for (i = 0; i < cmd->num_progs; i++) {
|
---|
456 | free(cmd->progs[i].argv);
|
---|
457 | #if ENABLE_LASH_PIPE_N_REDIRECTS
|
---|
458 | if (cmd->progs[i].redirects)
|
---|
459 | free(cmd->progs[i].redirects);
|
---|
460 | #endif
|
---|
461 | }
|
---|
462 | free(cmd->progs);
|
---|
463 | free(cmd->text);
|
---|
464 | free(cmd->cmdbuf);
|
---|
465 | keep = cmd->job_list;
|
---|
466 | memset(cmd, 0, sizeof(struct job));
|
---|
467 | cmd->job_list = keep;
|
---|
468 | }
|
---|
469 |
|
---|
470 | /* remove a job from a jobset */
|
---|
471 | static void remove_job(struct jobset *j_list, struct job *job)
|
---|
472 | {
|
---|
473 | struct job *prevjob;
|
---|
474 |
|
---|
475 | free_job(job);
|
---|
476 | if (job == j_list->head) {
|
---|
477 | j_list->head = job->next;
|
---|
478 | } else {
|
---|
479 | prevjob = j_list->head;
|
---|
480 | while (prevjob->next != job)
|
---|
481 | prevjob = prevjob->next;
|
---|
482 | prevjob->next = job->next;
|
---|
483 | }
|
---|
484 |
|
---|
485 | if (j_list->head)
|
---|
486 | last_jobid = j_list->head->jobid;
|
---|
487 | else
|
---|
488 | last_jobid = 0;
|
---|
489 |
|
---|
490 | free(job);
|
---|
491 | }
|
---|
492 |
|
---|
493 | /* Checks to see if any background processes have exited -- if they
|
---|
494 | have, figure out why and see if a job has completed */
|
---|
495 | static void checkjobs(struct jobset *j_list)
|
---|
496 | {
|
---|
497 | struct job *job;
|
---|
498 | pid_t childpid;
|
---|
499 | int status;
|
---|
500 | int prognum = 0;
|
---|
501 |
|
---|
502 | while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
|
---|
503 | for (job = j_list->head; job; job = job->next) {
|
---|
504 | prognum = 0;
|
---|
505 | while (prognum < job->num_progs &&
|
---|
506 | job->progs[prognum].pid != childpid) prognum++;
|
---|
507 | if (prognum < job->num_progs)
|
---|
508 | break;
|
---|
509 | }
|
---|
510 |
|
---|
511 | /* This happens on backticked commands */
|
---|
512 | if (job == NULL)
|
---|
513 | return;
|
---|
514 |
|
---|
515 | if (WIFEXITED(status) || WIFSIGNALED(status)) {
|
---|
516 | /* child exited */
|
---|
517 | job->running_progs--;
|
---|
518 | job->progs[prognum].pid = 0;
|
---|
519 |
|
---|
520 | if (!job->running_progs) {
|
---|
521 | printf(JOB_STATUS_FORMAT, job->jobid, "Done", job->text);
|
---|
522 | last_jobid = 0;
|
---|
523 | remove_job(j_list, job);
|
---|
524 | }
|
---|
525 | } else {
|
---|
526 | /* child stopped */
|
---|
527 | job->stopped_progs++;
|
---|
528 | job->progs[prognum].is_stopped = 1;
|
---|
529 | }
|
---|
530 | }
|
---|
531 |
|
---|
532 | if (childpid == -1 && errno != ECHILD)
|
---|
533 | bb_perror_msg("waitpid");
|
---|
534 | }
|
---|
535 | #else
|
---|
536 | static void checkjobs(struct jobset *j_list)
|
---|
537 | {
|
---|
538 | }
|
---|
539 | static void free_job(struct job *cmd)
|
---|
540 | {
|
---|
541 | }
|
---|
542 | static void remove_job(struct jobset *j_list, struct job *job)
|
---|
543 | {
|
---|
544 | }
|
---|
545 | #endif
|
---|
546 |
|
---|
547 | #if ENABLE_LASH_PIPE_N_REDIRECTS
|
---|
548 | /* squirrel != NULL means we squirrel away copies of stdin, stdout,
|
---|
549 | * and stderr if they are redirected. */
|
---|
550 | static int setup_redirects(struct child_prog *prog, int squirrel[])
|
---|
551 | {
|
---|
552 | int i;
|
---|
553 | int openfd;
|
---|
554 | int mode = O_RDONLY;
|
---|
555 | struct redir_struct *redir = prog->redirects;
|
---|
556 |
|
---|
557 | for (i = 0; i < prog->num_redirects; i++, redir++) {
|
---|
558 | switch (redir->type) {
|
---|
559 | case REDIRECT_INPUT:
|
---|
560 | mode = O_RDONLY;
|
---|
561 | break;
|
---|
562 | case REDIRECT_OVERWRITE:
|
---|
563 | mode = O_WRONLY | O_CREAT | O_TRUNC;
|
---|
564 | break;
|
---|
565 | case REDIRECT_APPEND:
|
---|
566 | mode = O_WRONLY | O_CREAT | O_APPEND;
|
---|
567 | break;
|
---|
568 | }
|
---|
569 |
|
---|
570 | openfd = open3_or_warn(redir->filename, mode, 0666);
|
---|
571 | if (openfd < 0) {
|
---|
572 | /* this could get lost if stderr has been redirected, but
|
---|
573 | bash and ash both lose it as well (though zsh doesn't!) */
|
---|
574 | return 1;
|
---|
575 | }
|
---|
576 |
|
---|
577 | if (openfd != redir->fd) {
|
---|
578 | if (squirrel && redir->fd < 3) {
|
---|
579 | squirrel[redir->fd] = dup(redir->fd);
|
---|
580 | fcntl(squirrel[redir->fd], F_SETFD, FD_CLOEXEC);
|
---|
581 | }
|
---|
582 | dup2(openfd, redir->fd);
|
---|
583 | close(openfd);
|
---|
584 | }
|
---|
585 | }
|
---|
586 |
|
---|
587 | return 0;
|
---|
588 | }
|
---|
589 |
|
---|
590 | static void restore_redirects(int squirrel[])
|
---|
591 | {
|
---|
592 | int i, fd;
|
---|
593 | for (i = 0; i < 3; i++) {
|
---|
594 | fd = squirrel[i];
|
---|
595 | if (fd != -1) {
|
---|
596 | /* No error checking. I sure wouldn't know what
|
---|
597 | * to do with an error if I found one! */
|
---|
598 | dup2(fd, i);
|
---|
599 | close(fd);
|
---|
600 | }
|
---|
601 | }
|
---|
602 | }
|
---|
603 | #else
|
---|
604 | static inline int setup_redirects(struct child_prog *prog, int squirrel[])
|
---|
605 | {
|
---|
606 | return 0;
|
---|
607 | }
|
---|
608 | static inline void restore_redirects(int squirrel[])
|
---|
609 | {
|
---|
610 | }
|
---|
611 | #endif
|
---|
612 |
|
---|
613 | static inline void cmdedit_set_initial_prompt(void)
|
---|
614 | {
|
---|
615 | #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
---|
616 | PS1 = NULL;
|
---|
617 | #else
|
---|
618 | PS1 = getenv("PS1");
|
---|
619 | if (PS1 == 0)
|
---|
620 | PS1 = "\\w \\$ ";
|
---|
621 | #endif
|
---|
622 | }
|
---|
623 |
|
---|
624 | static inline const char* setup_prompt_string(void)
|
---|
625 | {
|
---|
626 | #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
---|
627 | /* Set up the prompt */
|
---|
628 | if (shell_context == 0) {
|
---|
629 | char *ns;
|
---|
630 | free((char*)PS1);
|
---|
631 | ns = xmalloc(strlen(cwd)+4);
|
---|
632 | sprintf(ns, "%s %c ", cwd, (geteuid() != 0) ? '$': '#');
|
---|
633 | PS1 = ns;
|
---|
634 | return ns;
|
---|
635 | } else {
|
---|
636 | return PS2;
|
---|
637 | }
|
---|
638 | #else
|
---|
639 | return (shell_context == 0)? PS1 : PS2;
|
---|
640 | #endif
|
---|
641 | }
|
---|
642 |
|
---|
643 | #if ENABLE_FEATURE_EDITING
|
---|
644 | static line_input_t *line_input_state;
|
---|
645 | #endif
|
---|
646 |
|
---|
647 | static int get_command_bufsiz(FILE * source, char *command)
|
---|
648 | {
|
---|
649 | const char *prompt_str;
|
---|
650 |
|
---|
651 | if (source == NULL) {
|
---|
652 | if (local_pending_command) {
|
---|
653 | /* a command specified (-c option): return it & mark it done */
|
---|
654 | strncpy(command, local_pending_command, BUFSIZ);
|
---|
655 | local_pending_command = NULL;
|
---|
656 | return 0;
|
---|
657 | }
|
---|
658 | return 1;
|
---|
659 | }
|
---|
660 |
|
---|
661 | if (source == stdin) {
|
---|
662 | prompt_str = setup_prompt_string();
|
---|
663 |
|
---|
664 | #if ENABLE_FEATURE_EDITING
|
---|
665 | /*
|
---|
666 | ** enable command line editing only while a command line
|
---|
667 | ** is actually being read; otherwise, we'll end up bequeathing
|
---|
668 | ** atexit() handlers and other unwanted stuff to our
|
---|
669 | ** child processes (rob@sysgo.de)
|
---|
670 | */
|
---|
671 | read_line_input(prompt_str, command, BUFSIZ, line_input_state);
|
---|
672 | return 0;
|
---|
673 | #else
|
---|
674 | fputs(prompt_str, stdout);
|
---|
675 | #endif
|
---|
676 | }
|
---|
677 |
|
---|
678 | if (!fgets(command, BUFSIZ - 2, source)) {
|
---|
679 | if (source == stdin)
|
---|
680 | puts("");
|
---|
681 | return 1;
|
---|
682 | }
|
---|
683 |
|
---|
684 | return 0;
|
---|
685 | }
|
---|
686 |
|
---|
687 | static char * strsep_space(char *string, int * ix)
|
---|
688 | {
|
---|
689 | /* Short circuit the trivial case */
|
---|
690 | if (!string || ! string[*ix])
|
---|
691 | return NULL;
|
---|
692 |
|
---|
693 | /* Find the end of the token. */
|
---|
694 | while (string[*ix] && !isspace(string[*ix]) ) {
|
---|
695 | (*ix)++;
|
---|
696 | }
|
---|
697 |
|
---|
698 | /* Find the end of any whitespace trailing behind
|
---|
699 | * the token and let that be part of the token */
|
---|
700 | while (string[*ix] && (isspace)(string[*ix]) ) {
|
---|
701 | (*ix)++;
|
---|
702 | }
|
---|
703 |
|
---|
704 | if (!*ix) {
|
---|
705 | /* Nothing useful was found */
|
---|
706 | return NULL;
|
---|
707 | }
|
---|
708 |
|
---|
709 | return xstrndup(string, *ix);
|
---|
710 | }
|
---|
711 |
|
---|
712 | static int expand_arguments(char *command)
|
---|
713 | {
|
---|
714 | static const char out_of_space[] ALIGN1 = "out of space during expansion";
|
---|
715 |
|
---|
716 | int total_length = 0, length, i, retval, ix = 0;
|
---|
717 | expand_t expand_result;
|
---|
718 | char *tmpcmd, *cmd, *cmd_copy;
|
---|
719 | char *src, *dst, *var;
|
---|
720 | int flags = GLOB_NOCHECK
|
---|
721 | #ifdef GLOB_BRACE
|
---|
722 | | GLOB_BRACE
|
---|
723 | #endif
|
---|
724 | #ifdef GLOB_TILDE
|
---|
725 | | GLOB_TILDE
|
---|
726 | #endif
|
---|
727 | ;
|
---|
728 |
|
---|
729 | /* get rid of the terminating \n */
|
---|
730 | chomp(command);
|
---|
731 |
|
---|
732 | /* Fix up escape sequences to be the Real Thing(tm) */
|
---|
733 | while (command && command[ix]) {
|
---|
734 | if (command[ix] == '\\') {
|
---|
735 | const char *tmp = command+ix+1;
|
---|
736 | command[ix] = bb_process_escape_sequence( &tmp );
|
---|
737 | memmove(command+ix + 1, tmp, strlen(tmp)+1);
|
---|
738 | }
|
---|
739 | ix++;
|
---|
740 | }
|
---|
741 | /* Use glob and then fixup environment variables and such */
|
---|
742 |
|
---|
743 | /* It turns out that glob is very stupid. We have to feed it one word at a
|
---|
744 | * time since it can't cope with a full string. Here we convert command
|
---|
745 | * (char*) into cmd (char**, one word per string) */
|
---|
746 |
|
---|
747 | /* We need a clean copy, so strsep can mess up the copy while
|
---|
748 | * we write stuff into the original (in a minute) */
|
---|
749 | cmd = cmd_copy = xstrdup(command);
|
---|
750 | *command = '\0';
|
---|
751 | for (ix = 0, tmpcmd = cmd;
|
---|
752 | (tmpcmd = strsep_space(cmd, &ix)) != NULL; cmd += ix, ix = 0) {
|
---|
753 | if (*tmpcmd == '\0')
|
---|
754 | break;
|
---|
755 | /* we need to trim() the result for glob! */
|
---|
756 | trim(tmpcmd);
|
---|
757 | retval = glob(tmpcmd, flags, NULL, &expand_result);
|
---|
758 | free(tmpcmd); /* Free mem allocated by strsep_space */
|
---|
759 | if (retval == GLOB_NOSPACE) {
|
---|
760 | /* Mem may have been allocated... */
|
---|
761 | globfree(&expand_result);
|
---|
762 | bb_error_msg(out_of_space);
|
---|
763 | return FALSE;
|
---|
764 | } else if (retval != 0) {
|
---|
765 | /* Some other error. GLOB_NOMATCH shouldn't
|
---|
766 | * happen because of the GLOB_NOCHECK flag in
|
---|
767 | * the glob call. */
|
---|
768 | bb_error_msg("syntax error");
|
---|
769 | return FALSE;
|
---|
770 | } else {
|
---|
771 | /* Convert from char** (one word per string) to a simple char*,
|
---|
772 | * but don't overflow command which is BUFSIZ in length */
|
---|
773 | for (i = 0; i < expand_result.gl_pathc; i++) {
|
---|
774 | length = strlen(expand_result.gl_pathv[i]);
|
---|
775 | if (total_length+length+1 >= BUFSIZ) {
|
---|
776 | bb_error_msg(out_of_space);
|
---|
777 | return FALSE;
|
---|
778 | }
|
---|
779 | strcat(command+total_length, " ");
|
---|
780 | total_length += 1;
|
---|
781 | strcat(command+total_length, expand_result.gl_pathv[i]);
|
---|
782 | total_length += length;
|
---|
783 | }
|
---|
784 | globfree(&expand_result);
|
---|
785 | }
|
---|
786 | }
|
---|
787 | free(cmd_copy);
|
---|
788 | trim(command);
|
---|
789 |
|
---|
790 | /* Now do the shell variable substitutions which
|
---|
791 | * wordexp can't do for us, namely $? and $! */
|
---|
792 | src = command;
|
---|
793 | while ((dst = strchr(src,'$')) != NULL) {
|
---|
794 | var = NULL;
|
---|
795 | switch (*(dst+1)) {
|
---|
796 | case '?':
|
---|
797 | var = itoa(last_return_code);
|
---|
798 | break;
|
---|
799 | case '!':
|
---|
800 | if (last_bg_pid == -1)
|
---|
801 | *var = '\0';
|
---|
802 | else
|
---|
803 | var = itoa(last_bg_pid);
|
---|
804 | break;
|
---|
805 | /* Everything else like $$, $#, $[0-9], etc. should all be
|
---|
806 | * expanded by wordexp(), so we can in theory skip that stuff
|
---|
807 | * here, but just to be on the safe side (i.e., since uClibc
|
---|
808 | * wordexp doesn't do this stuff yet), lets leave it in for
|
---|
809 | * now. */
|
---|
810 | case '$':
|
---|
811 | var = itoa(getpid());
|
---|
812 | break;
|
---|
813 | case '#':
|
---|
814 | var = itoa(argc-1);
|
---|
815 | break;
|
---|
816 | case '0':case '1':case '2':case '3':case '4':
|
---|
817 | case '5':case '6':case '7':case '8':case '9':
|
---|
818 | {
|
---|
819 | int ixx = *(dst+1)-48+1;
|
---|
820 | if (ixx >= argc) {
|
---|
821 | var = '\0';
|
---|
822 | } else {
|
---|
823 | var = argv[ixx];
|
---|
824 | }
|
---|
825 | }
|
---|
826 | break;
|
---|
827 |
|
---|
828 | }
|
---|
829 | if (var) {
|
---|
830 | /* a single character construction was found, and
|
---|
831 | * already handled in the case statement */
|
---|
832 | src = dst + 2;
|
---|
833 | } else {
|
---|
834 | /* Looks like an environment variable */
|
---|
835 | char delim_hold;
|
---|
836 | int num_skip_chars = 0;
|
---|
837 | int dstlen = strlen(dst);
|
---|
838 | /* Is this a ${foo} type variable? */
|
---|
839 | if (dstlen >= 2 && *(dst+1) == '{') {
|
---|
840 | src = strchr(dst+1, '}');
|
---|
841 | num_skip_chars = 1;
|
---|
842 | } else {
|
---|
843 | src = dst + 1;
|
---|
844 | while ((isalnum)(*src) || *src == '_') src++;
|
---|
845 | }
|
---|
846 | if (src == NULL) {
|
---|
847 | src = dst+dstlen;
|
---|
848 | }
|
---|
849 | delim_hold = *src;
|
---|
850 | *src = '\0'; /* temporary */
|
---|
851 | var = getenv(dst + 1 + num_skip_chars);
|
---|
852 | *src = delim_hold;
|
---|
853 | src += num_skip_chars;
|
---|
854 | }
|
---|
855 | if (var == NULL) {
|
---|
856 | /* Seems we got an un-expandable variable. So delete it. */
|
---|
857 | var = (char*)"";
|
---|
858 | }
|
---|
859 | {
|
---|
860 | int subst_len = strlen(var);
|
---|
861 | int trail_len = strlen(src);
|
---|
862 | if (dst+subst_len+trail_len >= command+BUFSIZ) {
|
---|
863 | bb_error_msg(out_of_space);
|
---|
864 | return FALSE;
|
---|
865 | }
|
---|
866 | /* Move stuff to the end of the string to accommodate
|
---|
867 | * filling the created gap with the new stuff */
|
---|
868 | memmove(dst+subst_len, src, trail_len+1);
|
---|
869 | /* Now copy in the new stuff */
|
---|
870 | memcpy(dst, var, subst_len);
|
---|
871 | src = dst+subst_len;
|
---|
872 | }
|
---|
873 | }
|
---|
874 |
|
---|
875 | return TRUE;
|
---|
876 | }
|
---|
877 |
|
---|
878 | /* Return cmd->num_progs as 0 if no command is present (e.g. an empty
|
---|
879 | line). If a valid command is found, command_ptr is set to point to
|
---|
880 | the beginning of the next command (if the original command had more
|
---|
881 | then one job associated with it) or NULL if no more commands are
|
---|
882 | present. */
|
---|
883 | static int parse_command(char **command_ptr, struct job *job, int *inbg)
|
---|
884 | {
|
---|
885 | char *command;
|
---|
886 | char *return_command = NULL;
|
---|
887 | char *src, *buf;
|
---|
888 | int argc_l;
|
---|
889 | int flag;
|
---|
890 | int argv_alloced;
|
---|
891 | char quote = '\0';
|
---|
892 | struct child_prog *prog;
|
---|
893 | #if ENABLE_LASH_PIPE_N_REDIRECTS
|
---|
894 | int i;
|
---|
895 | char *chptr;
|
---|
896 | #endif
|
---|
897 |
|
---|
898 | /* skip leading white space */
|
---|
899 | *command_ptr = skip_whitespace(*command_ptr);
|
---|
900 |
|
---|
901 | /* this handles empty lines or leading '#' characters */
|
---|
902 | if (!**command_ptr || (**command_ptr == '#')) {
|
---|
903 | job->num_progs = 0;
|
---|
904 | return 0;
|
---|
905 | }
|
---|
906 |
|
---|
907 | *inbg = 0;
|
---|
908 | job->num_progs = 1;
|
---|
909 | job->progs = xmalloc(sizeof(*job->progs));
|
---|
910 |
|
---|
911 | /* We set the argv elements to point inside of this string. The
|
---|
912 | memory is freed by free_job(). Allocate twice the original
|
---|
913 | length in case we need to quote every single character.
|
---|
914 |
|
---|
915 | Getting clean memory relieves us of the task of NULL
|
---|
916 | terminating things and makes the rest of this look a bit
|
---|
917 | cleaner (though it is, admittedly, a tad less efficient) */
|
---|
918 | job->cmdbuf = command = xzalloc(2*strlen(*command_ptr) + 1);
|
---|
919 | job->text = NULL;
|
---|
920 |
|
---|
921 | prog = job->progs;
|
---|
922 | prog->num_redirects = 0;
|
---|
923 | prog->is_stopped = 0;
|
---|
924 | prog->family = job;
|
---|
925 | #if ENABLE_LASH_PIPE_N_REDIRECTS
|
---|
926 | prog->redirects = NULL;
|
---|
927 | #endif
|
---|
928 |
|
---|
929 | argv_alloced = 5;
|
---|
930 | prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced);
|
---|
931 | prog->argv[0] = job->cmdbuf;
|
---|
932 |
|
---|
933 | flag = argc_l = 0;
|
---|
934 | buf = command;
|
---|
935 | src = *command_ptr;
|
---|
936 | while (*src && !(flag & LASH_OPT_DONE)) {
|
---|
937 | if (quote == *src) {
|
---|
938 | quote = '\0';
|
---|
939 | } else if (quote) {
|
---|
940 | if (*src == '\\') {
|
---|
941 | src++;
|
---|
942 | if (!*src) {
|
---|
943 | bb_error_msg("character expected after \\");
|
---|
944 | free_job(job);
|
---|
945 | return 1;
|
---|
946 | }
|
---|
947 |
|
---|
948 | /* in shell, "\'" should yield \' */
|
---|
949 | if (*src != quote) {
|
---|
950 | *buf++ = '\\';
|
---|
951 | *buf++ = '\\';
|
---|
952 | }
|
---|
953 | } else if (*src == '*' || *src == '?' || *src == '[' ||
|
---|
954 | *src == ']') *buf++ = '\\';
|
---|
955 | *buf++ = *src;
|
---|
956 | } else if (isspace(*src)) {
|
---|
957 | if (*prog->argv[argc_l] || (flag & LASH_OPT_SAW_QUOTE)) {
|
---|
958 | buf++, argc_l++;
|
---|
959 | /* +1 here leaves room for the NULL which ends argv */
|
---|
960 | if ((argc_l + 1) == argv_alloced) {
|
---|
961 | argv_alloced += 5;
|
---|
962 | prog->argv = xrealloc(prog->argv,
|
---|
963 | sizeof(*prog->argv) * argv_alloced);
|
---|
964 | }
|
---|
965 | prog->argv[argc_l] = buf;
|
---|
966 | flag ^= LASH_OPT_SAW_QUOTE;
|
---|
967 | }
|
---|
968 | } else
|
---|
969 | switch (*src) {
|
---|
970 | case '"':
|
---|
971 | case '\'':
|
---|
972 | quote = *src;
|
---|
973 | flag |= LASH_OPT_SAW_QUOTE;
|
---|
974 | break;
|
---|
975 |
|
---|
976 | case '#': /* comment */
|
---|
977 | if (*(src-1)== '$')
|
---|
978 | *buf++ = *src;
|
---|
979 | else
|
---|
980 | flag |= LASH_OPT_DONE;
|
---|
981 | break;
|
---|
982 |
|
---|
983 | #if ENABLE_LASH_PIPE_N_REDIRECTS
|
---|
984 | case '>': /* redirects */
|
---|
985 | case '<':
|
---|
986 | i = prog->num_redirects++;
|
---|
987 | prog->redirects = xrealloc(prog->redirects,
|
---|
988 | sizeof(*prog->redirects) * (i + 1));
|
---|
989 |
|
---|
990 | prog->redirects[i].fd = -1;
|
---|
991 | if (buf != prog->argv[argc_l]) {
|
---|
992 | /* the stuff before this character may be the file number
|
---|
993 | being redirected */
|
---|
994 | prog->redirects[i].fd =
|
---|
995 | strtol(prog->argv[argc_l], &chptr, 10);
|
---|
996 |
|
---|
997 | if (*chptr && *prog->argv[argc_l]) {
|
---|
998 | buf++, argc_l++;
|
---|
999 | prog->argv[argc_l] = buf;
|
---|
1000 | }
|
---|
1001 | }
|
---|
1002 |
|
---|
1003 | if (prog->redirects[i].fd == -1) {
|
---|
1004 | if (*src == '>')
|
---|
1005 | prog->redirects[i].fd = 1;
|
---|
1006 | else
|
---|
1007 | prog->redirects[i].fd = 0;
|
---|
1008 | }
|
---|
1009 |
|
---|
1010 | if (*src++ == '>') {
|
---|
1011 | if (*src == '>')
|
---|
1012 | prog->redirects[i].type =
|
---|
1013 | REDIRECT_APPEND, src++;
|
---|
1014 | else
|
---|
1015 | prog->redirects[i].type = REDIRECT_OVERWRITE;
|
---|
1016 | } else {
|
---|
1017 | prog->redirects[i].type = REDIRECT_INPUT;
|
---|
1018 | }
|
---|
1019 |
|
---|
1020 | /* This isn't POSIX sh compliant. Oh well. */
|
---|
1021 | chptr = src;
|
---|
1022 | chptr = skip_whitespace(chptr);
|
---|
1023 |
|
---|
1024 | if (!*chptr) {
|
---|
1025 | bb_error_msg("file name expected after %c", *(src-1));
|
---|
1026 | free_job(job);
|
---|
1027 | job->num_progs = 0;
|
---|
1028 | return 1;
|
---|
1029 | }
|
---|
1030 |
|
---|
1031 | prog->redirects[i].filename = buf;
|
---|
1032 | while (*chptr && !isspace(*chptr))
|
---|
1033 | *buf++ = *chptr++;
|
---|
1034 |
|
---|
1035 | src = chptr - 1; /* we src++ later */
|
---|
1036 | prog->argv[argc_l] = ++buf;
|
---|
1037 | break;
|
---|
1038 |
|
---|
1039 | case '|': /* pipe */
|
---|
1040 | /* finish this command */
|
---|
1041 | if (*prog->argv[argc_l] || flag & LASH_OPT_SAW_QUOTE)
|
---|
1042 | argc_l++;
|
---|
1043 | if (!argc_l) {
|
---|
1044 | goto empty_command_in_pipe;
|
---|
1045 | }
|
---|
1046 | prog->argv[argc_l] = NULL;
|
---|
1047 |
|
---|
1048 | /* and start the next */
|
---|
1049 | job->num_progs++;
|
---|
1050 | job->progs = xrealloc(job->progs,
|
---|
1051 | sizeof(*job->progs) * job->num_progs);
|
---|
1052 | prog = job->progs + (job->num_progs - 1);
|
---|
1053 | prog->num_redirects = 0;
|
---|
1054 | prog->redirects = NULL;
|
---|
1055 | prog->is_stopped = 0;
|
---|
1056 | prog->family = job;
|
---|
1057 | argc_l = 0;
|
---|
1058 |
|
---|
1059 | argv_alloced = 5;
|
---|
1060 | prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced);
|
---|
1061 | prog->argv[0] = ++buf;
|
---|
1062 |
|
---|
1063 | src++;
|
---|
1064 | src = skip_whitespace(src);
|
---|
1065 |
|
---|
1066 | if (!*src) {
|
---|
1067 | empty_command_in_pipe:
|
---|
1068 | bb_error_msg("empty command in pipe");
|
---|
1069 | free_job(job);
|
---|
1070 | job->num_progs = 0;
|
---|
1071 | return 1;
|
---|
1072 | }
|
---|
1073 | src--; /* we'll ++ it at the end of the loop */
|
---|
1074 |
|
---|
1075 | break;
|
---|
1076 | #endif
|
---|
1077 |
|
---|
1078 | #if ENABLE_LASH_JOB_CONTROL
|
---|
1079 | case '&': /* background */
|
---|
1080 | *inbg = 1;
|
---|
1081 | /* fallthrough */
|
---|
1082 | #endif
|
---|
1083 | case ';': /* multiple commands */
|
---|
1084 | flag |= LASH_OPT_DONE;
|
---|
1085 | return_command = *command_ptr + (src - *command_ptr) + 1;
|
---|
1086 | break;
|
---|
1087 |
|
---|
1088 | case '\\':
|
---|
1089 | src++;
|
---|
1090 | if (!*src) {
|
---|
1091 | bb_error_msg("character expected after \\");
|
---|
1092 | free_job(job);
|
---|
1093 | return 1;
|
---|
1094 | }
|
---|
1095 | if (*src == '*' || *src == '[' || *src == ']'
|
---|
1096 | || *src == '?') *buf++ = '\\';
|
---|
1097 | /* fallthrough */
|
---|
1098 | default:
|
---|
1099 | *buf++ = *src;
|
---|
1100 | }
|
---|
1101 |
|
---|
1102 | src++;
|
---|
1103 | }
|
---|
1104 |
|
---|
1105 | if (*prog->argv[argc_l] || flag & LASH_OPT_SAW_QUOTE) {
|
---|
1106 | argc_l++;
|
---|
1107 | }
|
---|
1108 | if (!argc_l) {
|
---|
1109 | free_job(job);
|
---|
1110 | return 0;
|
---|
1111 | }
|
---|
1112 | prog->argv[argc_l] = NULL;
|
---|
1113 |
|
---|
1114 | if (!return_command) {
|
---|
1115 | job->text = xstrdup(*command_ptr);
|
---|
1116 | } else {
|
---|
1117 | /* This leaves any trailing spaces, which is a bit sloppy */
|
---|
1118 | job->text = xstrndup(*command_ptr, return_command - *command_ptr);
|
---|
1119 | }
|
---|
1120 |
|
---|
1121 | *command_ptr = return_command;
|
---|
1122 |
|
---|
1123 | return 0;
|
---|
1124 | }
|
---|
1125 |
|
---|
1126 | /* Run the child_prog, no matter what kind of command it uses.
|
---|
1127 | */
|
---|
1128 | static int pseudo_exec(struct child_prog *child)
|
---|
1129 | {
|
---|
1130 | const struct built_in_command *x;
|
---|
1131 |
|
---|
1132 | /* Check if the command matches any of the non-forking builtins.
|
---|
1133 | * Depending on context, this might be redundant. But it's
|
---|
1134 | * easier to waste a few CPU cycles than it is to figure out
|
---|
1135 | * if this is one of those cases.
|
---|
1136 | */
|
---|
1137 | /* Check if the command matches any of the forking builtins. */
|
---|
1138 | for (x = bltins; x <= &VEC_LAST(bltins); x++) {
|
---|
1139 | if (strcmp(child->argv[0], x->cmd) == 0) {
|
---|
1140 | _exit(x->function(child));
|
---|
1141 | }
|
---|
1142 | }
|
---|
1143 |
|
---|
1144 |
|
---|
1145 | /* Check if the command matches any busybox internal
|
---|
1146 | * commands ("applets") here. Following discussions from
|
---|
1147 | * November 2000 on busybox@busybox.net, don't use
|
---|
1148 | * bb_get_last_path_component(). This way explicit (with
|
---|
1149 | * slashes) filenames will never be interpreted as an
|
---|
1150 | * applet, just like with builtins. This way the user can
|
---|
1151 | * override an applet with an explicit filename reference.
|
---|
1152 | * The only downside to this change is that an explicit
|
---|
1153 | * /bin/foo invocation will fork and exec /bin/foo, even if
|
---|
1154 | * /bin/foo is a symlink to busybox.
|
---|
1155 | */
|
---|
1156 | if (ENABLE_FEATURE_SH_STANDALONE) {
|
---|
1157 | run_applet_and_exit(child->argv[0], child->argv);
|
---|
1158 | }
|
---|
1159 |
|
---|
1160 | execvp(child->argv[0], child->argv);
|
---|
1161 |
|
---|
1162 | /* Do not use bb_perror_msg_and_die() here, since we must not
|
---|
1163 | * call exit() but should call _exit() instead */
|
---|
1164 | bb_perror_msg("%s", child->argv[0]);
|
---|
1165 | _exit(EXIT_FAILURE);
|
---|
1166 | }
|
---|
1167 |
|
---|
1168 | static void insert_job(struct job *newjob, int inbg)
|
---|
1169 | {
|
---|
1170 | struct job *thejob;
|
---|
1171 | struct jobset *j_list = newjob->job_list;
|
---|
1172 |
|
---|
1173 | /* find the ID for thejob to use */
|
---|
1174 | newjob->jobid = 1;
|
---|
1175 | for (thejob = j_list->head; thejob; thejob = thejob->next)
|
---|
1176 | if (thejob->jobid >= newjob->jobid)
|
---|
1177 | newjob->jobid = thejob->jobid + 1;
|
---|
1178 |
|
---|
1179 | /* add thejob to the list of running jobs */
|
---|
1180 | if (!j_list->head) {
|
---|
1181 | thejob = j_list->head = xmalloc(sizeof(*thejob));
|
---|
1182 | } else {
|
---|
1183 | for (thejob = j_list->head; thejob->next; thejob = thejob->next) /* nothing */;
|
---|
1184 | thejob->next = xmalloc(sizeof(*thejob));
|
---|
1185 | thejob = thejob->next;
|
---|
1186 | }
|
---|
1187 |
|
---|
1188 | *thejob = *newjob; /* physically copy the struct job */
|
---|
1189 | thejob->next = NULL;
|
---|
1190 | thejob->running_progs = thejob->num_progs;
|
---|
1191 | thejob->stopped_progs = 0;
|
---|
1192 |
|
---|
1193 | #if ENABLE_LASH_JOB_CONTROL
|
---|
1194 | if (inbg) {
|
---|
1195 | /* we don't wait for background thejobs to return -- append it
|
---|
1196 | to the list of backgrounded thejobs and leave it alone */
|
---|
1197 | printf("[%d] %d\n", thejob->jobid,
|
---|
1198 | newjob->progs[newjob->num_progs - 1].pid);
|
---|
1199 | last_jobid = newjob->jobid;
|
---|
1200 | last_bg_pid = newjob->progs[newjob->num_progs - 1].pid;
|
---|
1201 | } else {
|
---|
1202 | newjob->job_list->fg = thejob;
|
---|
1203 |
|
---|
1204 | /* move the new process group into the foreground */
|
---|
1205 | /* Ignore errors since child could have already exited */
|
---|
1206 | tcsetpgrp(shell_terminal, newjob->pgrp);
|
---|
1207 | }
|
---|
1208 | #endif
|
---|
1209 | }
|
---|
1210 |
|
---|
1211 | static int run_command(struct job *newjob, int inbg, int outpipe[2])
|
---|
1212 | {
|
---|
1213 | /* struct job *thejob; */
|
---|
1214 | int i;
|
---|
1215 | int nextin, nextout;
|
---|
1216 | int pipefds[2]; /* pipefd[0] is for reading */
|
---|
1217 | const struct built_in_command *x;
|
---|
1218 | struct child_prog *child;
|
---|
1219 |
|
---|
1220 | nextin = 0;
|
---|
1221 | for (i = 0; i < newjob->num_progs; i++) {
|
---|
1222 | child = &(newjob->progs[i]);
|
---|
1223 |
|
---|
1224 | nextout = 1;
|
---|
1225 | if ((i + 1) < newjob->num_progs) {
|
---|
1226 | xpipe(pipefds);
|
---|
1227 | nextout = pipefds[1];
|
---|
1228 | } else if (outpipe[1] != -1) {
|
---|
1229 | nextout = outpipe[1];
|
---|
1230 | }
|
---|
1231 |
|
---|
1232 | /* Check if the command matches any non-forking builtins,
|
---|
1233 | * but only if this is a simple command.
|
---|
1234 | * Non-forking builtins within pipes have to fork anyway,
|
---|
1235 | * and are handled in pseudo_exec. "echo foo | read bar"
|
---|
1236 | * is doomed to failure, and doesn't work on bash, either.
|
---|
1237 | */
|
---|
1238 | if (newjob->num_progs == 1) {
|
---|
1239 | int rcode;
|
---|
1240 | int squirrel[] = {-1, -1, -1};
|
---|
1241 |
|
---|
1242 | /* Check if the command sets an environment variable. */
|
---|
1243 | if (strchr(child->argv[0], '=') != NULL) {
|
---|
1244 | child->argv[1] = child->argv[0];
|
---|
1245 | return builtin_export(child);
|
---|
1246 | }
|
---|
1247 |
|
---|
1248 | for (x = bltins; x <= &VEC_LAST(bltins); x++) {
|
---|
1249 | if (strcmp(child->argv[0], x->cmd) == 0) {
|
---|
1250 | setup_redirects(child, squirrel);
|
---|
1251 | rcode = x->function(child);
|
---|
1252 | restore_redirects(squirrel);
|
---|
1253 | return rcode;
|
---|
1254 | }
|
---|
1255 | }
|
---|
1256 | #if ENABLE_FEATURE_SH_STANDALONE
|
---|
1257 | {
|
---|
1258 | const struct bb_applet *a = find_applet_by_name(child->argv[i]);
|
---|
1259 | if (a && a->nofork) {
|
---|
1260 | setup_redirects(child, squirrel);
|
---|
1261 | rcode = run_nofork_applet(a, child->argv + i);
|
---|
1262 | restore_redirects(squirrel);
|
---|
1263 | return rcode;
|
---|
1264 | }
|
---|
1265 | }
|
---|
1266 | #endif
|
---|
1267 | }
|
---|
1268 |
|
---|
1269 | #if BB_MMU
|
---|
1270 | child->pid = fork();
|
---|
1271 | #else
|
---|
1272 | child->pid = vfork();
|
---|
1273 | #endif
|
---|
1274 | if (!child->pid) {
|
---|
1275 | /* Set the handling for job control signals back to the default. */
|
---|
1276 | signal(SIGINT, SIG_DFL);
|
---|
1277 | signal(SIGQUIT, SIG_DFL);
|
---|
1278 | signal(SIGTSTP, SIG_DFL);
|
---|
1279 | signal(SIGTTIN, SIG_DFL);
|
---|
1280 | signal(SIGTTOU, SIG_DFL);
|
---|
1281 | signal(SIGCHLD, SIG_DFL);
|
---|
1282 |
|
---|
1283 | /* Close all open filehandles. */
|
---|
1284 | while (close_me_list)
|
---|
1285 | close((long)llist_pop(&close_me_list));
|
---|
1286 |
|
---|
1287 | if (outpipe[1] != -1) {
|
---|
1288 | close(outpipe[0]);
|
---|
1289 | }
|
---|
1290 | if (nextin != 0) {
|
---|
1291 | dup2(nextin, 0);
|
---|
1292 | close(nextin);
|
---|
1293 | }
|
---|
1294 |
|
---|
1295 | if (nextout != 1) {
|
---|
1296 | dup2(nextout, 1);
|
---|
1297 | dup2(nextout, 2); /* Really? */
|
---|
1298 | close(nextout);
|
---|
1299 | close(pipefds[0]);
|
---|
1300 | }
|
---|
1301 |
|
---|
1302 | /* explicit redirects override pipes */
|
---|
1303 | setup_redirects(child,NULL);
|
---|
1304 |
|
---|
1305 | pseudo_exec(child);
|
---|
1306 | }
|
---|
1307 | if (outpipe[1] != -1) {
|
---|
1308 | close(outpipe[1]);
|
---|
1309 | }
|
---|
1310 |
|
---|
1311 | /* put our child in the process group whose leader is the
|
---|
1312 | first process in this pipe */
|
---|
1313 | setpgid(child->pid, newjob->progs[0].pid);
|
---|
1314 | if (nextin != 0)
|
---|
1315 | close(nextin);
|
---|
1316 | if (nextout != 1)
|
---|
1317 | close(nextout);
|
---|
1318 |
|
---|
1319 | /* If there isn't another process, nextin is garbage
|
---|
1320 | but it doesn't matter */
|
---|
1321 | nextin = pipefds[0];
|
---|
1322 | }
|
---|
1323 |
|
---|
1324 | newjob->pgrp = newjob->progs[0].pid;
|
---|
1325 |
|
---|
1326 | insert_job(newjob, inbg);
|
---|
1327 |
|
---|
1328 | return 0;
|
---|
1329 | }
|
---|
1330 |
|
---|
1331 | static int busy_loop(FILE * input)
|
---|
1332 | {
|
---|
1333 | char *command;
|
---|
1334 | char *next_command = NULL;
|
---|
1335 | struct job newjob;
|
---|
1336 | int i;
|
---|
1337 | int inbg = 0;
|
---|
1338 | int status;
|
---|
1339 | #if ENABLE_LASH_JOB_CONTROL
|
---|
1340 | pid_t parent_pgrp;
|
---|
1341 | /* save current owner of TTY so we can restore it on exit */
|
---|
1342 | parent_pgrp = tcgetpgrp(shell_terminal);
|
---|
1343 | #endif
|
---|
1344 | newjob.job_list = &job_list;
|
---|
1345 | newjob.job_context = DEFAULT_CONTEXT;
|
---|
1346 |
|
---|
1347 | command = xzalloc(BUFSIZ);
|
---|
1348 |
|
---|
1349 | while (1) {
|
---|
1350 | if (!job_list.fg) {
|
---|
1351 | /* no job is in the foreground */
|
---|
1352 |
|
---|
1353 | /* see if any background processes have exited */
|
---|
1354 | checkjobs(&job_list);
|
---|
1355 |
|
---|
1356 | if (!next_command) {
|
---|
1357 | if (get_command_bufsiz(input, command))
|
---|
1358 | break;
|
---|
1359 | next_command = command;
|
---|
1360 | }
|
---|
1361 |
|
---|
1362 | if (!expand_arguments(next_command)) {
|
---|
1363 | free(command);
|
---|
1364 | command = xzalloc(BUFSIZ);
|
---|
1365 | next_command = NULL;
|
---|
1366 | continue;
|
---|
1367 | }
|
---|
1368 |
|
---|
1369 | if (!parse_command(&next_command, &newjob, &inbg) &&
|
---|
1370 | newjob.num_progs) {
|
---|
1371 | int pipefds[2] = { -1, -1 };
|
---|
1372 | debug_printf("job=%p fed to run_command by busy_loop()'\n",
|
---|
1373 | &newjob);
|
---|
1374 | run_command(&newjob, inbg, pipefds);
|
---|
1375 | }
|
---|
1376 | else {
|
---|
1377 | free(command);
|
---|
1378 | command = xzalloc(BUFSIZ);
|
---|
1379 | next_command = NULL;
|
---|
1380 | }
|
---|
1381 | } else {
|
---|
1382 | /* a job is running in the foreground; wait for it */
|
---|
1383 | i = 0;
|
---|
1384 | while (!job_list.fg->progs[i].pid ||
|
---|
1385 | job_list.fg->progs[i].is_stopped == 1) i++;
|
---|
1386 |
|
---|
1387 | if (waitpid(job_list.fg->progs[i].pid, &status, WUNTRACED) < 0) {
|
---|
1388 | if (errno != ECHILD) {
|
---|
1389 | bb_perror_msg_and_die("waitpid(%d)", job_list.fg->progs[i].pid);
|
---|
1390 | }
|
---|
1391 | }
|
---|
1392 |
|
---|
1393 | if (WIFEXITED(status) || WIFSIGNALED(status)) {
|
---|
1394 | /* the child exited */
|
---|
1395 | job_list.fg->running_progs--;
|
---|
1396 | job_list.fg->progs[i].pid = 0;
|
---|
1397 |
|
---|
1398 | last_return_code = WEXITSTATUS(status);
|
---|
1399 |
|
---|
1400 | if (!job_list.fg->running_progs) {
|
---|
1401 | /* child exited */
|
---|
1402 | remove_job(&job_list, job_list.fg);
|
---|
1403 | job_list.fg = NULL;
|
---|
1404 | }
|
---|
1405 | }
|
---|
1406 | #if ENABLE_LASH_JOB_CONTROL
|
---|
1407 | else {
|
---|
1408 | /* the child was stopped */
|
---|
1409 | job_list.fg->stopped_progs++;
|
---|
1410 | job_list.fg->progs[i].is_stopped = 1;
|
---|
1411 |
|
---|
1412 | if (job_list.fg->stopped_progs == job_list.fg->running_progs) {
|
---|
1413 | printf("\n" JOB_STATUS_FORMAT, job_list.fg->jobid,
|
---|
1414 | "Stopped", job_list.fg->text);
|
---|
1415 | job_list.fg = NULL;
|
---|
1416 | }
|
---|
1417 | }
|
---|
1418 |
|
---|
1419 | if (!job_list.fg) {
|
---|
1420 | /* move the shell to the foreground */
|
---|
1421 | /* suppress messages when run from /linuxrc mag@sysgo.de */
|
---|
1422 | if (tcsetpgrp(shell_terminal, getpgrp()) && errno != ENOTTY)
|
---|
1423 | bb_perror_msg("tcsetpgrp");
|
---|
1424 | }
|
---|
1425 | #endif
|
---|
1426 | }
|
---|
1427 | }
|
---|
1428 | free(command);
|
---|
1429 |
|
---|
1430 | #if ENABLE_LASH_JOB_CONTROL
|
---|
1431 | /* return controlling TTY back to parent process group before exiting */
|
---|
1432 | if (tcsetpgrp(shell_terminal, parent_pgrp) && errno != ENOTTY)
|
---|
1433 | bb_perror_msg("tcsetpgrp");
|
---|
1434 | #endif
|
---|
1435 |
|
---|
1436 | /* return exit status if called with "-c" */
|
---|
1437 | if (input == NULL && WIFEXITED(status))
|
---|
1438 | return WEXITSTATUS(status);
|
---|
1439 |
|
---|
1440 | return 0;
|
---|
1441 | }
|
---|
1442 |
|
---|
1443 | #if ENABLE_FEATURE_CLEAN_UP
|
---|
1444 | static void free_memory(void)
|
---|
1445 | {
|
---|
1446 | free(cwd);
|
---|
1447 |
|
---|
1448 | if (job_list.fg && !job_list.fg->running_progs) {
|
---|
1449 | remove_job(&job_list, job_list.fg);
|
---|
1450 | }
|
---|
1451 | }
|
---|
1452 | #else
|
---|
1453 | void free_memory(void);
|
---|
1454 | #endif
|
---|
1455 |
|
---|
1456 | #if ENABLE_LASH_JOB_CONTROL
|
---|
1457 | /* Make sure we have a controlling tty. If we get started under a job
|
---|
1458 | * aware app (like bash for example), make sure we are now in charge so
|
---|
1459 | * we don't fight over who gets the foreground */
|
---|
1460 | static void setup_job_control(void)
|
---|
1461 | {
|
---|
1462 | int status;
|
---|
1463 | pid_t shell_pgrp;
|
---|
1464 |
|
---|
1465 | /* Loop until we are in the foreground. */
|
---|
1466 | while ((status = tcgetpgrp(shell_terminal)) >= 0) {
|
---|
1467 | shell_pgrp = getpgrp();
|
---|
1468 | if (status == shell_pgrp) {
|
---|
1469 | break;
|
---|
1470 | }
|
---|
1471 | kill(- shell_pgrp, SIGTTIN);
|
---|
1472 | }
|
---|
1473 |
|
---|
1474 | /* Ignore interactive and job-control signals. */
|
---|
1475 | signal(SIGINT, SIG_IGN);
|
---|
1476 | signal(SIGQUIT, SIG_IGN);
|
---|
1477 | signal(SIGTSTP, SIG_IGN);
|
---|
1478 | signal(SIGTTIN, SIG_IGN);
|
---|
1479 | signal(SIGTTOU, SIG_IGN);
|
---|
1480 | signal(SIGCHLD, SIG_IGN);
|
---|
1481 |
|
---|
1482 | /* Put ourselves in our own process group. */
|
---|
1483 | setsid();
|
---|
1484 | shell_pgrp = getpid();
|
---|
1485 | setpgid(shell_pgrp, shell_pgrp);
|
---|
1486 |
|
---|
1487 | /* Grab control of the terminal. */
|
---|
1488 | tcsetpgrp(shell_terminal, shell_pgrp);
|
---|
1489 | }
|
---|
1490 | #else
|
---|
1491 | static inline void setup_job_control(void)
|
---|
1492 | {
|
---|
1493 | }
|
---|
1494 | #endif
|
---|
1495 |
|
---|
1496 | int lash_main(int argc_l, char **argv_l);
|
---|
1497 | int lash_main(int argc_l, char **argv_l)
|
---|
1498 | {
|
---|
1499 | unsigned opt;
|
---|
1500 | FILE *input = stdin;
|
---|
1501 | argc = argc_l;
|
---|
1502 | argv = argv_l;
|
---|
1503 |
|
---|
1504 | #if ENABLE_FEATURE_EDITING
|
---|
1505 | line_input_state = new_line_input_t(FOR_SHELL);
|
---|
1506 | #endif
|
---|
1507 |
|
---|
1508 | /* These variables need re-initializing when recursing */
|
---|
1509 | last_jobid = 0;
|
---|
1510 | close_me_list = NULL;
|
---|
1511 | job_list.head = NULL;
|
---|
1512 | job_list.fg = NULL;
|
---|
1513 | last_return_code = 1;
|
---|
1514 |
|
---|
1515 | if (argv[0] && argv[0][0] == '-') {
|
---|
1516 | FILE *prof_input;
|
---|
1517 | prof_input = fopen("/etc/profile", "r");
|
---|
1518 | if (prof_input) {
|
---|
1519 | llist_add_to(&close_me_list, (void *)(long)fileno(prof_input));
|
---|
1520 | /* Now run the file */
|
---|
1521 | busy_loop(prof_input);
|
---|
1522 | fclose_if_not_stdin(prof_input);
|
---|
1523 | llist_pop(&close_me_list);
|
---|
1524 | }
|
---|
1525 | }
|
---|
1526 |
|
---|
1527 | opt = getopt32(argv_l, "+ic:", &local_pending_command);
|
---|
1528 | #define LASH_OPT_i (1<<0)
|
---|
1529 | #define LASH_OPT_c (1<<1)
|
---|
1530 | if (opt & LASH_OPT_c) {
|
---|
1531 | input = NULL;
|
---|
1532 | optind++;
|
---|
1533 | argv += optind;
|
---|
1534 | }
|
---|
1535 | /* A shell is interactive if the `-i' flag was given, or if all of
|
---|
1536 | * the following conditions are met:
|
---|
1537 | * no -c command
|
---|
1538 | * no arguments remaining or the -s flag given
|
---|
1539 | * standard input is a terminal
|
---|
1540 | * standard output is a terminal
|
---|
1541 | * Refer to Posix.2, the description of the `sh' utility. */
|
---|
1542 | if (argv[optind] == NULL && input == stdin
|
---|
1543 | && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
|
---|
1544 | ) {
|
---|
1545 | opt |= LASH_OPT_i;
|
---|
1546 | }
|
---|
1547 | setup_job_control();
|
---|
1548 | if (opt & LASH_OPT_i) {
|
---|
1549 | /* Looks like they want an interactive shell */
|
---|
1550 | if (!ENABLE_FEATURE_SH_EXTRA_QUIET) {
|
---|
1551 | printf("\n\n%s built-in shell (lash)\n"
|
---|
1552 | "Enter 'help' for a list of built-in commands.\n\n",
|
---|
1553 | bb_banner);
|
---|
1554 | }
|
---|
1555 | } else if (!local_pending_command && argv[optind]) {
|
---|
1556 | //printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
|
---|
1557 | input = xfopen(argv[optind], "r");
|
---|
1558 | /* be lazy, never mark this closed */
|
---|
1559 | llist_add_to(&close_me_list, (void *)(long)fileno(input));
|
---|
1560 | }
|
---|
1561 |
|
---|
1562 | /* initialize the cwd -- this is never freed...*/
|
---|
1563 | update_cwd();
|
---|
1564 |
|
---|
1565 | if (ENABLE_FEATURE_CLEAN_UP) atexit(free_memory);
|
---|
1566 |
|
---|
1567 | if (ENABLE_FEATURE_EDITING) cmdedit_set_initial_prompt();
|
---|
1568 | else PS1 = NULL;
|
---|
1569 |
|
---|
1570 | return busy_loop(input);
|
---|
1571 | }
|
---|