| /* 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. |
| */ |
| #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 = getenv("SHELL"); |
| if (shell == NULL) { |
| shell = DEFAULT_SHELL; |
| } |
| |
| 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); |
| } |