diff options
Diffstat (limited to 'util-linux/script.c')
| -rw-r--r-- | util-linux/script.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/util-linux/script.c b/util-linux/script.c new file mode 100644 index 0000000..fda726e --- /dev/null +++ b/util-linux/script.c @@ -0,0 +1,195 @@ +/* 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); +} |