| /* 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 tarball for details. |
| */ |
| |
| #include "libbb.h" |
| |
| struct globals { |
| int child_pid; |
| int attr_ok; /* NB: 0: ok */ |
| struct termios tt; |
| const char *fname; |
| }; |
| #define G (*ptr_to_globals) |
| #define child_pid (G.child_pid) |
| #define attr_ok (G.attr_ok ) |
| #define tt (G.tt ) |
| #define fname (G.fname ) |
| #define INIT_G() do { \ |
| PTR_TO_GLOBALS = xzalloc(sizeof(G)); \ |
| fname = "typescript"; \ |
| } while (0) |
| |
| static void done(void) |
| { |
| if (child_pid) { /* we are parent */ |
| if (attr_ok == 0) |
| tcsetattr(0, TCSAFLUSH, &tt); |
| if (!(option_mask32 & 8)) /* not -q */ |
| printf("Script done, file is %s\n", fname); |
| } |
| exit(0); |
| } |
| |
| #ifdef UNUSED |
| static void handle_sigchld(int sig) |
| { |
| /* wait for the exited child and exit */ |
| while (wait_any_nohang(&sig) > 0) |
| continue; |
| done(); |
| } |
| #endif |
| |
| #if ENABLE_GETOPT_LONG |
| 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" |
| ; |
| #endif |
| |
| int script_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE; |
| int script_main(int argc, char *argv[]) |
| { |
| int opt, pty; |
| int winsz_ok; |
| int mode; |
| struct termios rtt; |
| struct winsize win; |
| char line[32]; |
| const char *shell; |
| char shell_opt[] = "-i"; |
| char *shell_arg = NULL; |
| |
| INIT_G(); |
| #if ENABLE_GETOPT_LONG |
| applet_long_options = getopt_longopts; |
| #endif |
| opt_complementary = "?1"; /* max one arg */ |
| opt = getopt32(argv, "ac:fq", &shell_arg); |
| //argc -= optind; |
| argv += optind; |
| if (argv[0]) { |
| fname = argv[0]; |
| } |
| mode = O_CREAT|O_TRUNC|O_WRONLY; |
| if (opt & 1) { |
| mode = O_CREAT|O_APPEND|O_WRONLY; |
| } |
| if (opt & 2) { |
| shell_opt[1] = 'c'; |
| } |
| if (!(opt & 8)) { /* not -q */ |
| printf("Script started, file is %s\n", fname); |
| } |
| shell = getenv("SHELL"); |
| if (shell == NULL) { |
| shell = _PATH_BSHELL; |
| } |
| |
| pty = getpty(line, sizeof(line)); |
| if (pty < 0) { |
| bb_perror_msg_and_die("can't get pty"); |
| } |
| |
| /* 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); |
| |
| /* We exit as soon as child exits */ |
| //signal(SIGCHLD, handle_sigchld); |
| signal(SIGCHLD, (void (*)(int)) done); |
| |
| child_pid = vfork(); |
| if (child_pid < 0) { |
| bb_perror_msg_and_die("vfork"); |
| } |
| |
| if (child_pid) { |
| /* parent */ |
| char buf[256]; |
| struct pollfd pfd[2]; |
| int outfd; |
| int fd_count = 2; |
| struct pollfd *ppfd = pfd; |
| |
| outfd = xopen(fname, mode); |
| pfd[0].fd = 0; |
| pfd[0].events = POLLIN; |
| pfd[1].fd = pty; |
| pfd[1].events = POLLIN; |
| ndelay_on(pty); /* this descriptor is not shared, can do this */ |
| /* ndelay_on(0); - NO, stdin can be shared! */ |
| |
| /* 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 && safe_poll(ppfd, fd_count, -1) > 0) { |
| if (pfd[0].revents) { |
| int count = safe_read(0, buf, sizeof(buf)); |
| if (count <= 0) { |
| /* err/eof: don't read anymore */ |
| pfd[0].revents = 0; |
| ppfd++; |
| fd_count--; |
| } else { |
| full_write(pty, buf, count); |
| } |
| } |
| if (pfd[1].revents) { |
| int count; |
| errno = 0; |
| count = safe_read(pty, buf, sizeof(buf)); |
| if (count <= 0 && errno != EAGAIN) { |
| /* err/eof: don't read anymore */ |
| pfd[1].revents = 0; |
| fd_count--; |
| } |
| if (count > 0) { |
| full_write(1, buf, count); |
| full_write(outfd, buf, count); |
| if (opt & 4) { /* -f */ |
| fsync(outfd); |
| } |
| } |
| } |
| } |
| done(); /* does not return */ |
| } |
| |
| /* 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(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 */); |
| |
| /* signal(SIGCHLD, SIG_DFL); - exec does this for us */ |
| execl(shell, shell, shell_opt, shell_arg, NULL); |
| bb_simple_perror_msg_and_die(shell); |
| } |