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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 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);
}
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