[3320] | 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 | #include "libbb.h"
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| 14 |
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| 15 | int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 16 | int script_main(int argc UNUSED_PARAM, char **argv)
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| 17 | {
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| 18 | int opt;
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| 19 | int mode;
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| 20 | int child_pid;
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| 21 | int attr_ok; /* NB: 0: ok */
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| 22 | int winsz_ok;
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| 23 | int pty;
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| 24 | char pty_line[GETPTY_BUFSIZE];
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| 25 | struct termios tt, rtt;
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| 26 | struct winsize win;
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| 27 | const char *fname = "typescript";
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| 28 | const char *shell;
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| 29 | char shell_opt[] = "-i";
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| 30 | char *shell_arg = NULL;
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| 31 | enum {
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| 32 | OPT_a = (1 << 0),
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| 33 | OPT_c = (1 << 1),
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| 34 | OPT_f = (1 << 2),
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| 35 | OPT_q = (1 << 3),
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| 36 | OPT_t = (1 << 4),
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| 37 | };
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| 38 |
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| 39 | #if ENABLE_LONG_OPTS
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| 40 | static const char getopt_longopts[] ALIGN1 =
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| 41 | "append\0" No_argument "a"
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| 42 | "command\0" Required_argument "c"
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| 43 | "flush\0" No_argument "f"
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| 44 | "quiet\0" No_argument "q"
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| 45 | IF_SCRIPTREPLAY("timing\0" No_argument "t")
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| 46 | ;
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| 47 |
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| 48 | applet_long_options = getopt_longopts;
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| 49 | #endif
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| 50 |
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| 51 | opt_complementary = "?1"; /* max one arg */
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| 52 | opt = getopt32(argv, "ac:fq" IF_SCRIPTREPLAY("t") , &shell_arg);
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| 53 | //argc -= optind;
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| 54 | argv += optind;
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| 55 | if (argv[0]) {
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| 56 | fname = argv[0];
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| 57 | }
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| 58 | mode = O_CREAT|O_TRUNC|O_WRONLY;
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| 59 | if (opt & OPT_a) {
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| 60 | mode = O_CREAT|O_APPEND|O_WRONLY;
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| 61 | }
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| 62 | if (opt & OPT_c) {
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| 63 | shell_opt[1] = 'c';
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| 64 | }
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| 65 | if (!(opt & OPT_q)) {
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| 66 | printf("Script started, file is %s\n", fname);
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| 67 | }
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| 68 | shell = getenv("SHELL");
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| 69 | if (shell == NULL) {
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| 70 | shell = DEFAULT_SHELL;
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| 71 | }
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| 72 |
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| 73 | pty = xgetpty(pty_line);
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| 74 |
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| 75 | /* get current stdin's tty params */
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| 76 | attr_ok = tcgetattr(0, &tt);
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| 77 | winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win);
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| 78 |
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| 79 | rtt = tt;
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| 80 | cfmakeraw(&rtt);
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| 81 | rtt.c_lflag &= ~ECHO;
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| 82 | tcsetattr(0, TCSAFLUSH, &rtt);
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| 83 |
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| 84 | /* "script" from util-linux exits when child exits,
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| 85 | * we wouldn't wait for EOF from slave pty
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| 86 | * (output may be produced by grandchildren of child) */
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| 87 | signal(SIGCHLD, record_signo);
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| 88 |
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| 89 | /* TODO: SIGWINCH? pass window size changes down to slave? */
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| 90 |
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| 91 | child_pid = xvfork();
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| 92 |
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| 93 | if (child_pid) {
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| 94 | /* parent */
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| 95 | #define buf bb_common_bufsiz1
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| 96 | struct pollfd pfd[2];
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| 97 | int outfd, count, loop;
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| 98 | double oldtime = ENABLE_SCRIPTREPLAY ? time(NULL) : 0;
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| 99 | smallint fd_count = 2;
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| 100 |
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| 101 | outfd = xopen(fname, mode);
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| 102 | pfd[0].fd = pty;
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| 103 | pfd[0].events = POLLIN;
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| 104 | pfd[1].fd = STDIN_FILENO;
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| 105 | pfd[1].events = POLLIN;
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| 106 | ndelay_on(pty); /* this descriptor is not shared, can do this */
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| 107 | /* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */
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| 108 |
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| 109 | /* copy stdin to pty master input,
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| 110 | * copy pty master output to stdout and file */
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| 111 | /* TODO: don't use full_write's, use proper write buffering */
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| 112 | while (fd_count && !bb_got_signal) {
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| 113 | /* not safe_poll! we want SIGCHLD to EINTR poll */
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| 114 | if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) {
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| 115 | /* If child exits too quickly, we may get EIO:
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| 116 | * for example, try "script -c true" */
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| 117 | break;
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| 118 | }
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| 119 | if (pfd[0].revents) {
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| 120 | errno = 0;
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| 121 | count = safe_read(pty, buf, sizeof(buf));
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| 122 | if (count <= 0 && errno != EAGAIN) {
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| 123 | /* err/eof from pty: exit */
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| 124 | goto restore;
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| 125 | }
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| 126 | if (count > 0) {
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| 127 | if (ENABLE_SCRIPTREPLAY && (opt & OPT_t)) {
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| 128 | struct timeval tv;
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| 129 | double newtime;
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| 130 |
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| 131 | gettimeofday(&tv, NULL);
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| 132 | newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
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| 133 | fprintf(stderr, "%f %u\n", newtime - oldtime, count);
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| 134 | oldtime = newtime;
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| 135 | }
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| 136 | full_write(STDOUT_FILENO, buf, count);
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| 137 | full_write(outfd, buf, count);
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| 138 | if (opt & OPT_f) {
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| 139 | fsync(outfd);
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| 140 | }
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| 141 | }
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| 142 | }
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| 143 | if (pfd[1].revents) {
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| 144 | count = safe_read(STDIN_FILENO, buf, sizeof(buf));
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| 145 | if (count <= 0) {
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| 146 | /* err/eof from stdin: don't read stdin anymore */
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| 147 | pfd[1].revents = 0;
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| 148 | fd_count--;
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| 149 | } else {
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| 150 | full_write(pty, buf, count);
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| 151 | }
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| 152 | }
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| 153 | }
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| 154 | /* If loop was exited because SIGCHLD handler set bb_got_signal,
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| 155 | * there still can be some buffered output. But dont loop forever:
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| 156 | * we won't pump orphaned grandchildren's output indefinitely.
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| 157 | * Testcase: running this in script:
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| 158 | * exec dd if=/dev/zero bs=1M count=1
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| 159 | * must have "1+0 records in, 1+0 records out" captured too.
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| 160 | * (util-linux's script doesn't do this. buggy :) */
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| 161 | loop = 999;
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| 162 | /* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */
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| 163 | while (--loop && (count = safe_read(pty, buf, sizeof(buf))) > 0) {
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| 164 | full_write(STDOUT_FILENO, buf, count);
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| 165 | full_write(outfd, buf, count);
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| 166 | }
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| 167 | restore:
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| 168 | if (attr_ok == 0)
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| 169 | tcsetattr(0, TCSAFLUSH, &tt);
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| 170 | if (!(opt & OPT_q))
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| 171 | printf("Script done, file is %s\n", fname);
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| 172 | return EXIT_SUCCESS;
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| 173 | }
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| 174 |
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| 175 | /* child: make pty slave to be input, output, error; run shell */
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| 176 | close(pty); /* close pty master */
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| 177 | /* open pty slave to fd 0,1,2 */
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| 178 | close(0);
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| 179 | xopen(pty_line, O_RDWR); /* uses fd 0 */
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| 180 | xdup2(0, 1);
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| 181 | xdup2(0, 2);
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| 182 | /* copy our original stdin tty's parameters to pty */
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| 183 | if (attr_ok == 0)
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| 184 | tcsetattr(0, TCSAFLUSH, &tt);
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| 185 | if (winsz_ok == 0)
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| 186 | ioctl(0, TIOCSWINSZ, (char *)&win);
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| 187 | /* set pty as a controlling tty */
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| 188 | setsid();
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| 189 | ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
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| 190 |
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| 191 | /* Non-ignored signals revert to SIG_DFL on exec anyway */
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| 192 | /*signal(SIGCHLD, SIG_DFL);*/
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| 193 | execl(shell, shell, shell_opt, shell_arg, (char *) NULL);
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| 194 | bb_simple_perror_msg_and_die(shell);
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| 195 | }
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