1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini ps implementation(s) for busybox
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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 | * Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
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7 | (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
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8 | *
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9 | * Licensed under the GPL version 2, see the file LICENSE in this tarball.
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10 | */
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11 |
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12 | #include "libbb.h"
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13 |
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14 | /* Absolute maximum on output line length */
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15 | enum { MAX_WIDTH = 2*1024 };
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16 |
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17 | #if ENABLE_DESKTOP
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18 |
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19 | /* Print value to buf, max size+1 chars (including trailing '\0') */
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20 |
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21 | static void func_user(char *buf, int size, const procps_status_t *ps)
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22 | {
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23 | safe_strncpy(buf, get_cached_username(ps->uid), size+1);
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24 | }
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25 |
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26 | static void func_comm(char *buf, int size, const procps_status_t *ps)
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27 | {
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28 | safe_strncpy(buf, ps->comm, size+1);
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29 | }
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30 |
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31 | static void func_args(char *buf, int size, const procps_status_t *ps)
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32 | {
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33 | read_cmdline(buf, size, ps->pid, ps->comm);
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34 | }
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35 |
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36 | static void func_pid(char *buf, int size, const procps_status_t *ps)
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37 | {
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38 | sprintf(buf, "%*u", size, ps->pid);
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39 | }
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40 |
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41 | static void func_ppid(char *buf, int size, const procps_status_t *ps)
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42 | {
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43 | sprintf(buf, "%*u", size, ps->ppid);
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44 | }
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45 |
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46 | static void func_pgid(char *buf, int size, const procps_status_t *ps)
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47 | {
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48 | sprintf(buf, "%*u", size, ps->pgid);
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49 | }
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50 |
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51 | static void put_u(char *buf, int size, unsigned u)
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52 | {
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53 | char buf5[5];
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54 | smart_ulltoa5( ((unsigned long long)u) << 10, buf5);
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55 | sprintf(buf, "%.*s", size, buf5);
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56 | }
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57 |
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58 | static void func_vsz(char *buf, int size, const procps_status_t *ps)
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59 | {
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60 | put_u(buf, size, ps->vsz);
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61 | }
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62 |
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63 | static void func_rss(char *buf, int size, const procps_status_t *ps)
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64 | {
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65 | put_u(buf, size, ps->rss);
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66 | }
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67 |
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68 | static void func_tty(char *buf, int size, const procps_status_t *ps)
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69 | {
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70 | buf[0] = '?';
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71 | buf[1] = '\0';
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72 | if (ps->tty_major) /* tty field of "0" means "no tty" */
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73 | snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
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74 | }
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75 |
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76 | #if ENABLE_SELINUX
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77 | static void func_label(char *buf, int size, const procps_status_t *ps)
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78 | {
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79 | safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
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80 | }
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81 | #endif
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82 |
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83 | /*
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84 | static void func_nice(char *buf, int size, const procps_status_t *ps)
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85 | {
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86 | ps->???
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87 | }
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88 |
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89 | static void func_etime(char *buf, int size, const procps_status_t *ps)
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90 | {
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91 | elapled time [[dd-]hh:]mm:ss
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92 | }
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93 |
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94 | static void func_time(char *buf, int size, const procps_status_t *ps)
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95 | {
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96 | cumulative time [[dd-]hh:]mm:ss
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97 | }
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98 |
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99 | static void func_pcpu(char *buf, int size, const procps_status_t *ps)
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100 | {
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101 | }
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102 | */
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103 |
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104 | typedef struct {
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105 | uint16_t width;
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106 | char name[6];
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107 | const char *header;
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108 | void (*f)(char *buf, int size, const procps_status_t *ps);
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109 | int ps_flags;
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110 | } ps_out_t;
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111 |
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112 | static const ps_out_t out_spec[] = {
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113 | // Mandated by POSIX:
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114 | { 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
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115 | { 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
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116 | { 256 , "args" ,"COMMAND",func_args ,PSSCAN_COMM },
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117 | { 5 , "pid" ,"PID" ,func_pid ,PSSCAN_PID },
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118 | { 5 , "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID },
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119 | { 5 , "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID },
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120 | // { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_ },
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121 | // { sizeof("GROUP" )-1, "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
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122 | // { sizeof("NI" )-1, "nice" ,"NI" ,func_nice ,PSSCAN_ },
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123 | // { sizeof("%CPU" )-1, "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
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124 | // { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID },
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125 | // { sizeof("RUSER" )-1, "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID },
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126 | // { sizeof("TIME" )-1, "time" ,"TIME" ,func_time ,PSSCAN_ },
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127 | { 6 , "tty" ,"TT" ,func_tty ,PSSCAN_TTY },
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128 | { 4 , "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ },
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129 | // Not mandated by POSIX, but useful:
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130 | { 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
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131 | #if ENABLE_SELINUX
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132 | { 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
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133 | #endif
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134 | };
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135 |
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136 | #if ENABLE_SELINUX
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137 | #define SELINIX_O_PREFIX "label,"
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138 | #define DEFAULT_O_STR SELINIX_O_PREFIX "pid,user" /* TODO: ,vsz,stat */ ",args"
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139 | #else
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140 | #define DEFAULT_O_STR "pid,user" /* TODO: ,vsz,stat */ ",args"
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141 | #endif
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142 |
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143 | struct globals {
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144 | ps_out_t* out;
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145 | int out_cnt;
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146 | int print_header;
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147 | int need_flags;
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148 | char *buffer;
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149 | unsigned terminal_width;
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150 | char default_o[sizeof(DEFAULT_O_STR)];
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151 | };
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152 | #define G (*(struct globals*)&bb_common_bufsiz1)
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153 | #define out (G.out )
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154 | #define out_cnt (G.out_cnt )
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155 | #define print_header (G.print_header )
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156 | #define need_flags (G.need_flags )
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157 | #define buffer (G.buffer )
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158 | #define terminal_width (G.terminal_width)
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159 | #define default_o (G.default_o )
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160 |
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161 | static ps_out_t* new_out_t(void)
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162 | {
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163 | int i = out_cnt++;
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164 | out = xrealloc(out, out_cnt * sizeof(*out));
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165 | return &out[i];
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166 | }
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167 |
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168 | static const ps_out_t* find_out_spec(const char *name)
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169 | {
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170 | int i;
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171 | for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
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172 | if (!strcmp(name, out_spec[i].name))
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173 | return &out_spec[i];
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174 | }
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175 | bb_error_msg_and_die("bad -o argument '%s'", name);
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176 | }
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177 |
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178 | static void parse_o(char* opt)
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179 | {
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180 | ps_out_t* new;
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181 | // POSIX: "-o is blank- or comma-separated list" (FIXME)
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182 | char *comma, *equal;
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183 | while (1) {
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184 | comma = strchr(opt, ',');
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185 | equal = strchr(opt, '=');
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186 | if (comma && (!equal || equal > comma)) {
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187 | *comma = '\0';
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188 | *new_out_t() = *find_out_spec(opt);
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189 | *comma = ',';
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190 | opt = comma + 1;
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191 | continue;
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192 | }
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193 | break;
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194 | }
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195 | // opt points to last spec in comma separated list.
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196 | // This one can have =HEADER part.
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197 | new = new_out_t();
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198 | if (equal)
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199 | *equal = '\0';
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200 | *new = *find_out_spec(opt);
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201 | if (equal) {
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202 | *equal = '=';
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203 | new->header = equal + 1;
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204 | // POSIX: the field widths shall be ... at least as wide as
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205 | // the header text (default or overridden value).
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206 | // If the header text is null, such as -o user=,
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207 | // the field width shall be at least as wide as the
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208 | // default header text
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209 | if (new->header[0]) {
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210 | new->width = strlen(new->header);
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211 | print_header = 1;
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212 | }
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213 | } else
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214 | print_header = 1;
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215 | }
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216 |
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217 | static void post_process(void)
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218 | {
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219 | int i;
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220 | int width = 0;
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221 | for (i = 0; i < out_cnt; i++) {
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222 | need_flags |= out[i].ps_flags;
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223 | if (out[i].header[0]) {
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224 | print_header = 1;
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225 | }
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226 | width += out[i].width + 1; /* "FIELD " */
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227 | }
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228 | #if ENABLE_SELINUX
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229 | if (!is_selinux_enabled())
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230 | need_flags &= ~PSSCAN_CONTEXT;
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231 | #endif
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232 | buffer = xmalloc(width + 1); /* for trailing \0 */
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233 | }
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234 |
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235 | static void format_header(void)
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236 | {
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237 | int i;
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238 | ps_out_t* op;
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239 | char *p;
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240 |
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241 | if (!print_header)
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242 | return;
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243 | p = buffer;
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244 | i = 0;
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245 | if (out_cnt) {
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246 | while (1) {
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247 | op = &out[i];
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248 | if (++i == out_cnt) /* do not pad last field */
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249 | break;
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250 | p += sprintf(p, "%-*s ", op->width, op->header);
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251 | }
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252 | strcpy(p, op->header);
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253 | }
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254 | printf("%.*s\n", terminal_width, buffer);
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255 | }
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256 |
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257 | static void format_process(const procps_status_t *ps)
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258 | {
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259 | int i, len;
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260 | char *p = buffer;
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261 | i = 0;
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262 | if (out_cnt) while (1) {
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263 | out[i].f(p, out[i].width, ps);
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264 | // POSIX: Any field need not be meaningful in all
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265 | // implementations. In such a case a hyphen ( '-' )
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266 | // should be output in place of the field value.
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267 | if (!p[0]) {
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268 | p[0] = '-';
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269 | p[1] = '\0';
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270 | }
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271 | len = strlen(p);
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272 | p += len;
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273 | len = out[i].width - len + 1;
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274 | if (++i == out_cnt) /* do not pad last field */
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275 | break;
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276 | p += sprintf(p, "%*s", len, "");
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277 | }
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278 | printf("%.*s\n", terminal_width, buffer);
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279 | }
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280 |
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281 | int ps_main(int argc, char **argv);
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282 | int ps_main(int argc, char **argv)
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283 | {
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284 | procps_status_t *p;
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285 | llist_t* opt_o = NULL;
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286 | USE_SELINUX(int opt;)
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287 |
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288 | // POSIX:
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289 | // -a Write information for all processes associated with terminals
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290 | // Implementations may omit session leaders from this list
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291 | // -A Write information for all processes
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292 | // -d Write information for all processes, except session leaders
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293 | // -e Write information for all processes (equivalent to -A.)
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294 | // -f Generate a full listing
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295 | // -l Generate a long listing
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296 | // -o col1,col2,col3=header
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297 | // Select which columns to display
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298 | /* We allow (and ignore) most of the above. FIXME */
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299 | opt_complementary = "o::";
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300 | USE_SELINUX(opt =) getopt32(argv, "Zo:aAdefl", &opt_o);
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301 | if (opt_o) {
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302 | do {
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303 | parse_o(opt_o->data);
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304 | opt_o = opt_o->link;
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305 | } while (opt_o);
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306 | } else {
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307 | /* Below: parse_o() needs char*, NOT const char*... */
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308 | #if ENABLE_SELINUX
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309 | if (!(opt & 1) || !is_selinux_enabled()) {
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310 | /* no -Z or no SELinux: do not show LABEL */
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311 | strcpy(default_o, DEFAULT_O_STR + sizeof(SELINIX_O_PREFIX)-1);
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312 | } else
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313 | #endif
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314 | {
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315 | strcpy(default_o, DEFAULT_O_STR);
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316 | }
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317 | parse_o(default_o);
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318 | }
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319 | post_process();
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320 |
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321 | /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
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322 | * and such large widths */
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323 | terminal_width = MAX_WIDTH;
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324 | if (isatty(1)) {
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325 | get_terminal_width_height(0, &terminal_width, NULL);
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326 | if (--terminal_width > MAX_WIDTH)
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327 | terminal_width = MAX_WIDTH;
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328 | }
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329 | format_header();
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330 |
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331 | p = NULL;
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332 | while ((p = procps_scan(p, need_flags))) {
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333 | format_process(p);
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334 | }
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335 |
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336 | return EXIT_SUCCESS;
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337 | }
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338 |
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339 |
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340 | #else /* !ENABLE_DESKTOP */
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341 |
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342 |
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343 | int ps_main(int argc, char **argv);
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344 | int ps_main(int argc, char **argv)
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345 | {
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346 | procps_status_t *p = NULL;
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347 | int len;
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348 | SKIP_SELINUX(const) int use_selinux = 0;
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349 | USE_SELINUX(int i;)
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350 | #if !ENABLE_FEATURE_PS_WIDE
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351 | enum { terminal_width = 79 };
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352 | #else
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353 | int terminal_width;
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354 | int w_count = 0;
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355 | #endif
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356 |
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357 | #if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
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358 | #if ENABLE_FEATURE_PS_WIDE
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359 | opt_complementary = "-:ww";
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360 | USE_SELINUX(i =) getopt32(argv, USE_SELINUX("Z") "w", &w_count);
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361 | /* if w is given once, GNU ps sets the width to 132,
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362 | * if w is given more than once, it is "unlimited"
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363 | */
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364 | if (w_count) {
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365 | terminal_width = (w_count==1) ? 132 : MAX_WIDTH;
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366 | } else {
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367 | get_terminal_width_height(0, &terminal_width, NULL);
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368 | /* Go one less... */
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369 | if (--terminal_width > MAX_WIDTH)
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370 | terminal_width = MAX_WIDTH;
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371 | }
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372 | #else /* only ENABLE_SELINUX */
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373 | i = getopt32(argv, "Z");
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374 | #endif
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375 | #if ENABLE_SELINUX
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376 | if ((i & 1) && is_selinux_enabled())
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377 | use_selinux = PSSCAN_CONTEXT;
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378 | #endif
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379 | #endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
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380 |
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381 | if (use_selinux)
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382 | puts(" PID Context Stat Command");
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383 | else
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384 | puts(" PID Uid VSZ Stat Command");
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385 |
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386 | while ((p = procps_scan(p, 0
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387 | | PSSCAN_PID
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388 | | PSSCAN_UIDGID
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389 | | PSSCAN_STATE
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390 | | PSSCAN_VSZ
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391 | | PSSCAN_COMM
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392 | | use_selinux
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393 | ))) {
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394 | #if ENABLE_SELINUX
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395 | if (use_selinux) {
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396 | len = printf("%5u %-32s %s ",
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397 | p->pid,
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398 | p->context ? p->context : "unknown",
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399 | p->state);
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400 | } else
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401 | #endif
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402 | {
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403 | const char *user = get_cached_username(p->uid);
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404 | if (p->vsz == 0)
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405 | len = printf("%5u %-8s %s ",
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406 | p->pid, user, p->state);
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407 | else
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408 | len = printf("%5u %-8s %6u %s ",
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409 | p->pid, user, p->vsz, p->state);
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410 | }
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411 |
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412 | {
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413 | int sz = terminal_width - len;
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414 | char buf[sz + 1];
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415 | read_cmdline(buf, sz, p->pid, p->comm);
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416 | puts(buf);
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417 | }
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418 | }
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419 | if (ENABLE_FEATURE_CLEAN_UP)
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420 | clear_username_cache();
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421 | return EXIT_SUCCESS;
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422 | }
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423 |
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424 | #endif /* ENABLE_DESKTOP */
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