1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * script implementation for busybox
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4 | *
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5 | * pascal.bellard@ads-lu.com
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6 | *
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7 | * Based on code from util-linux v 2.12r
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8 | * Copyright (c) 1980
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9 | * The Regents of the University of California. All rights reserved.
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10 | *
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11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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12 | */
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13 |
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14 | //usage:#define script_trivial_usage
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15 | //usage: "[-afq" IF_SCRIPTREPLAY("t") "] [-c PROG] [OUTFILE]"
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16 | //usage:#define script_full_usage "\n\n"
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17 | //usage: " -a Append output"
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18 | //usage: "\n -c PROG Run PROG, not shell"
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19 | //usage: "\n -f Flush output after each write"
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20 | //usage: "\n -q Quiet"
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21 | //usage: IF_SCRIPTREPLAY(
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22 | //usage: "\n -t Send timing to stderr"
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23 | //usage: )
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24 |
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25 | #include "libbb.h"
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26 | #include "common_bufsiz.h"
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27 |
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28 | int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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29 | int script_main(int argc UNUSED_PARAM, char **argv)
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30 | {
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31 | int opt;
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32 | int mode;
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33 | int child_pid;
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34 | int attr_ok; /* NB: 0: ok */
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35 | int winsz_ok;
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36 | int pty;
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37 | char pty_line[GETPTY_BUFSIZE];
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38 | struct termios tt, rtt;
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39 | struct winsize win;
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40 | const char *fname = "typescript";
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41 | const char *shell;
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42 | char shell_opt[] = "-i";
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43 | char *shell_arg = NULL;
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44 | enum {
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45 | OPT_a = (1 << 0),
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46 | OPT_c = (1 << 1),
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47 | OPT_f = (1 << 2),
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48 | OPT_q = (1 << 3),
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49 | OPT_t = (1 << 4),
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50 | };
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51 |
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52 | #if ENABLE_LONG_OPTS
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53 | static const char getopt_longopts[] ALIGN1 =
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54 | "append\0" No_argument "a"
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55 | "command\0" Required_argument "c"
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56 | "flush\0" No_argument "f"
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57 | "quiet\0" No_argument "q"
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58 | IF_SCRIPTREPLAY("timing\0" No_argument "t")
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59 | ;
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60 |
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61 | applet_long_options = getopt_longopts;
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62 | #endif
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63 |
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64 | opt_complementary = "?1"; /* max one arg */
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65 | opt = getopt32(argv, "ac:fq" IF_SCRIPTREPLAY("t") , &shell_arg);
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66 | //argc -= optind;
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67 | argv += optind;
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68 | if (argv[0]) {
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69 | fname = argv[0];
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70 | }
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71 | mode = O_CREAT|O_TRUNC|O_WRONLY;
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72 | if (opt & OPT_a) {
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73 | mode = O_CREAT|O_APPEND|O_WRONLY;
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74 | }
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75 | if (opt & OPT_c) {
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76 | shell_opt[1] = 'c';
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77 | }
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78 | if (!(opt & OPT_q)) {
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79 | printf("Script started, file is %s\n", fname);
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80 | }
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81 |
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82 | shell = get_shell_name();
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83 |
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84 | /* Some people run "script ... 0>&-".
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85 | * Our code assumes that STDIN_FILENO != pty.
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86 | * Ensure STDIN_FILENO is not closed:
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87 | */
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88 | bb_sanitize_stdio();
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89 |
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90 | pty = xgetpty(pty_line);
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91 |
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92 | /* get current stdin's tty params */
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93 | attr_ok = tcgetattr(0, &tt);
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94 | winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win);
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95 |
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96 | rtt = tt;
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97 | cfmakeraw(&rtt);
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98 | rtt.c_lflag &= ~ECHO;
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99 | tcsetattr(0, TCSAFLUSH, &rtt);
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100 |
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101 | /* "script" from util-linux exits when child exits,
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102 | * we wouldn't wait for EOF from slave pty
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103 | * (output may be produced by grandchildren of child) */
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104 | signal(SIGCHLD, record_signo);
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105 |
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106 | /* TODO: SIGWINCH? pass window size changes down to slave? */
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107 |
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108 | child_pid = xvfork();
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109 |
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110 | if (child_pid) {
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111 | /* parent */
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112 | struct pollfd pfd[2];
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113 | int outfd, count, loop;
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114 | double oldtime = ENABLE_SCRIPTREPLAY ? time(NULL) : 0;
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115 | smallint fd_count = 2;
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116 | #define buf bb_common_bufsiz1
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117 | setup_common_bufsiz();
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118 |
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119 | outfd = xopen(fname, mode);
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120 | pfd[0].fd = pty;
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121 | pfd[0].events = POLLIN;
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122 | pfd[1].fd = STDIN_FILENO;
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123 | pfd[1].events = POLLIN;
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124 | ndelay_on(pty); /* this descriptor is not shared, can do this */
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125 | /* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */
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126 |
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127 | /* copy stdin to pty master input,
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128 | * copy pty master output to stdout and file */
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129 | /* TODO: don't use full_write's, use proper write buffering */
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130 | while (fd_count && !bb_got_signal) {
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131 | /* not safe_poll! we want SIGCHLD to EINTR poll */
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132 | if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) {
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133 | /* If child exits too quickly, we may get EIO:
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134 | * for example, try "script -c true" */
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135 | break;
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136 | }
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137 | if (pfd[0].revents) {
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138 | errno = 0;
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139 | count = safe_read(pty, buf, COMMON_BUFSIZE);
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140 | if (count <= 0 && errno != EAGAIN) {
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141 | /* err/eof from pty: exit */
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142 | goto restore;
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143 | }
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144 | if (count > 0) {
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145 | if (ENABLE_SCRIPTREPLAY && (opt & OPT_t)) {
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146 | struct timeval tv;
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147 | double newtime;
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148 |
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149 | gettimeofday(&tv, NULL);
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150 | newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
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151 | fprintf(stderr, "%f %u\n", newtime - oldtime, count);
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152 | oldtime = newtime;
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153 | }
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154 | full_write(STDOUT_FILENO, buf, count);
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155 | full_write(outfd, buf, count);
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156 | if (opt & OPT_f) {
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157 | fsync(outfd);
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158 | }
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159 | }
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160 | }
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161 | if (pfd[1].revents) {
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162 | count = safe_read(STDIN_FILENO, buf, COMMON_BUFSIZE);
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163 | if (count <= 0) {
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164 | /* err/eof from stdin: don't read stdin anymore */
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165 | pfd[1].revents = 0;
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166 | fd_count--;
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167 | } else {
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168 | full_write(pty, buf, count);
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169 | }
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170 | }
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171 | }
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172 | /* If loop was exited because SIGCHLD handler set bb_got_signal,
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173 | * there still can be some buffered output. But dont loop forever:
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174 | * we won't pump orphaned grandchildren's output indefinitely.
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175 | * Testcase: running this in script:
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176 | * exec dd if=/dev/zero bs=1M count=1
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177 | * must have "1+0 records in, 1+0 records out" captured too.
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178 | * (util-linux's script doesn't do this. buggy :) */
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179 | loop = 999;
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180 | /* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */
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181 | while (--loop && (count = safe_read(pty, buf, COMMON_BUFSIZE)) > 0) {
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182 | full_write(STDOUT_FILENO, buf, count);
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183 | full_write(outfd, buf, count);
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184 | }
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185 | restore:
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186 | if (attr_ok == 0)
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187 | tcsetattr(0, TCSAFLUSH, &tt);
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188 | if (!(opt & OPT_q))
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189 | printf("Script done, file is %s\n", fname);
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190 | return EXIT_SUCCESS;
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191 | }
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192 |
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193 | /* child: make pty slave to be input, output, error; run shell */
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194 | close(pty); /* close pty master */
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195 | /* open pty slave to fd 0,1,2 */
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196 | close(0);
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197 | xopen(pty_line, O_RDWR); /* uses fd 0 */
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198 | xdup2(0, 1);
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199 | xdup2(0, 2);
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200 | /* copy our original stdin tty's parameters to pty */
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201 | if (attr_ok == 0)
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202 | tcsetattr(0, TCSAFLUSH, &tt);
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203 | if (winsz_ok == 0)
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204 | ioctl(0, TIOCSWINSZ, (char *)&win);
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205 | /* set pty as a controlling tty */
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206 | setsid();
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207 | ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
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208 |
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209 | /* Non-ignored signals revert to SIG_DFL on exec anyway */
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210 | /*signal(SIGCHLD, SIG_DFL);*/
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211 | execl(shell, shell, shell_opt, shell_arg, (char *) NULL);
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212 | bb_simple_perror_msg_and_die(shell);
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213 | }
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