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- /* vi: set sw=4 ts=4: */
- /*
- * script implementation for busybox
- *
- * pascal.bellard@ads-lu.com
- *
- * Based on code from util-linux v 2.12r
- * Copyright (c) 1980
- * The Regents of the University of California. All rights reserved.
- *
- * Licensed under GPLv2 or later, see file LICENSE in this source tree.
- */
- //usage:#define script_trivial_usage
- //usage: "[-afq" IF_SCRIPTREPLAY("t") "] [-c PROG] [OUTFILE]"
- //usage:#define script_full_usage "\n\n"
- //usage: " -a Append output"
- //usage: "\n -c PROG Run PROG, not shell"
- //usage: "\n -f Flush output after each write"
- //usage: "\n -q Quiet"
- //usage: IF_SCRIPTREPLAY(
- //usage: "\n -t Send timing to stderr"
- //usage: )
- #include "libbb.h"
- int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
- int script_main(int argc UNUSED_PARAM, char **argv)
- {
- int opt;
- int mode;
- int child_pid;
- int attr_ok; /* NB: 0: ok */
- int winsz_ok;
- int pty;
- char pty_line[GETPTY_BUFSIZE];
- struct termios tt, rtt;
- struct winsize win;
- const char *fname = "typescript";
- const char *shell;
- char shell_opt[] = "-i";
- char *shell_arg = NULL;
- enum {
- OPT_a = (1 << 0),
- OPT_c = (1 << 1),
- OPT_f = (1 << 2),
- OPT_q = (1 << 3),
- OPT_t = (1 << 4),
- };
- #if ENABLE_LONG_OPTS
- static const char getopt_longopts[] ALIGN1 =
- "append\0" No_argument "a"
- "command\0" Required_argument "c"
- "flush\0" No_argument "f"
- "quiet\0" No_argument "q"
- IF_SCRIPTREPLAY("timing\0" No_argument "t")
- ;
- applet_long_options = getopt_longopts;
- #endif
- opt_complementary = "?1"; /* max one arg */
- opt = getopt32(argv, "ac:fq" IF_SCRIPTREPLAY("t") , &shell_arg);
- //argc -= optind;
- argv += optind;
- if (argv[0]) {
- fname = argv[0];
- }
- mode = O_CREAT|O_TRUNC|O_WRONLY;
- if (opt & OPT_a) {
- mode = O_CREAT|O_APPEND|O_WRONLY;
- }
- if (opt & OPT_c) {
- shell_opt[1] = 'c';
- }
- if (!(opt & OPT_q)) {
- printf("Script started, file is %s\n", fname);
- }
- shell = get_shell_name();
- /* Some people run "script ... 0>&-".
- * Our code assumes that STDIN_FILENO != pty.
- * Ensure STDIN_FILENO is not closed:
- */
- bb_sanitize_stdio();
- pty = xgetpty(pty_line);
- /* get current stdin's tty params */
- attr_ok = tcgetattr(0, &tt);
- winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win);
- rtt = tt;
- cfmakeraw(&rtt);
- rtt.c_lflag &= ~ECHO;
- tcsetattr(0, TCSAFLUSH, &rtt);
- /* "script" from util-linux exits when child exits,
- * we wouldn't wait for EOF from slave pty
- * (output may be produced by grandchildren of child) */
- signal(SIGCHLD, record_signo);
- /* TODO: SIGWINCH? pass window size changes down to slave? */
- child_pid = xvfork();
- if (child_pid) {
- /* parent */
- #define buf bb_common_bufsiz1
- struct pollfd pfd[2];
- int outfd, count, loop;
- double oldtime = ENABLE_SCRIPTREPLAY ? time(NULL) : 0;
- smallint fd_count = 2;
- outfd = xopen(fname, mode);
- pfd[0].fd = pty;
- pfd[0].events = POLLIN;
- pfd[1].fd = STDIN_FILENO;
- pfd[1].events = POLLIN;
- ndelay_on(pty); /* this descriptor is not shared, can do this */
- /* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */
- /* copy stdin to pty master input,
- * copy pty master output to stdout and file */
- /* TODO: don't use full_write's, use proper write buffering */
- while (fd_count && !bb_got_signal) {
- /* not safe_poll! we want SIGCHLD to EINTR poll */
- if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) {
- /* If child exits too quickly, we may get EIO:
- * for example, try "script -c true" */
- break;
- }
- if (pfd[0].revents) {
- errno = 0;
- count = safe_read(pty, buf, sizeof(buf));
- if (count <= 0 && errno != EAGAIN) {
- /* err/eof from pty: exit */
- goto restore;
- }
- if (count > 0) {
- if (ENABLE_SCRIPTREPLAY && (opt & OPT_t)) {
- struct timeval tv;
- double newtime;
- gettimeofday(&tv, NULL);
- newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
- fprintf(stderr, "%f %u\n", newtime - oldtime, count);
- oldtime = newtime;
- }
- full_write(STDOUT_FILENO, buf, count);
- full_write(outfd, buf, count);
- if (opt & OPT_f) {
- fsync(outfd);
- }
- }
- }
- if (pfd[1].revents) {
- count = safe_read(STDIN_FILENO, buf, sizeof(buf));
- if (count <= 0) {
- /* err/eof from stdin: don't read stdin anymore */
- pfd[1].revents = 0;
- fd_count--;
- } else {
- full_write(pty, buf, count);
- }
- }
- }
- /* If loop was exited because SIGCHLD handler set bb_got_signal,
- * there still can be some buffered output. But dont loop forever:
- * we won't pump orphaned grandchildren's output indefinitely.
- * Testcase: running this in script:
- * exec dd if=/dev/zero bs=1M count=1
- * must have "1+0 records in, 1+0 records out" captured too.
- * (util-linux's script doesn't do this. buggy :) */
- loop = 999;
- /* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */
- while (--loop && (count = safe_read(pty, buf, sizeof(buf))) > 0) {
- full_write(STDOUT_FILENO, buf, count);
- full_write(outfd, buf, count);
- }
- restore:
- if (attr_ok == 0)
- tcsetattr(0, TCSAFLUSH, &tt);
- if (!(opt & OPT_q))
- printf("Script done, file is %s\n", fname);
- return EXIT_SUCCESS;
- }
- /* child: make pty slave to be input, output, error; run shell */
- close(pty); /* close pty master */
- /* open pty slave to fd 0,1,2 */
- close(0);
- xopen(pty_line, O_RDWR); /* uses fd 0 */
- xdup2(0, 1);
- xdup2(0, 2);
- /* copy our original stdin tty's parameters to pty */
- if (attr_ok == 0)
- tcsetattr(0, TCSAFLUSH, &tt);
- if (winsz_ok == 0)
- ioctl(0, TIOCSWINSZ, (char *)&win);
- /* set pty as a controlling tty */
- setsid();
- ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
- /* Non-ignored signals revert to SIG_DFL on exec anyway */
- /*signal(SIGCHLD, SIG_DFL);*/
- execl(shell, shell, shell_opt, shell_arg, (char *) NULL);
- bb_simple_perror_msg_and_die(shell);
- }
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