--- /dev/null
+/* 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);
+}
projects / oweals / busybox.git / commitdiff