/*
- * Copyright (c) 1980 Regents of the University of California.
+ * Copyright (C) 1980 Regents of the University of California.
+ * Copyright (C) 2013-2019 Karel Zak <kzak@redhat.com>
+ *
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
-
-/*
- * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
- * - added Native Language Support
- *
- * 2000-07-30 Per Andreas Buer <per@linpro.no> - added "q"-option
- *
- * 2014-05-30 Csaba Kos <csaba.kos@gmail.com>
- * - fixed a rare deadlock after child termination
- */
-
#include <stdio.h>
#include <stdlib.h>
#include <paths.h>
#include "xalloc.h"
#include "optutils.h"
#include "signames.h"
-
+#include "pty-session.h"
#include "debug.h"
static UL_DEBUG_DEFINE_MASK(script);
UL_DEBUG_DEFINE_MASKNAMES(script) = UL_DEBUG_EMPTY_MASKNAMES;
#define SCRIPT_DEBUG_INIT (1 << 1)
-#define SCRIPT_DEBUG_POLL (1 << 2)
-#define SCRIPT_DEBUG_SIGNAL (1 << 3)
-#define SCRIPT_DEBUG_IO (1 << 4)
+#define SCRIPT_DEBUG_PTY (1 << 2)
+#define SCRIPT_DEBUG_IO (1 << 3)
+#define SCRIPT_DEBUG_SIGNAL (1 << 4)
#define SCRIPT_DEBUG_MISC (1 << 5)
#define SCRIPT_DEBUG_ALL 0xFFFF
};
struct script_control {
- char *shell; /* shell to be executed */
- char *command; /* command to be executed */
uint64_t outsz; /* current output files size */
uint64_t maxsz; /* maximum output files size */
- int master; /* pseudoterminal master file descriptor */
- int slave; /* pseudoterminal slave file descriptor */
-
struct script_stream out; /* output */
struct script_stream in; /* input */
int ttycols;
int ttylines;
- int poll_timeout; /* poll() timeout, used in end of execution */
+ struct ul_pty *pty;
pid_t child; /* child pid */
int childstatus; /* child process exit value */
- struct termios attrs; /* slave terminal runtime attributes */
- struct winsize win; /* terminal window size */
-#if !HAVE_LIBUTIL || !HAVE_PTY_H
- char *line; /* terminal line */
-#endif
+
unsigned int
append:1, /* append output */
rc_wanted:1, /* return child exit value */
flush:1, /* flush after each write */
quiet:1, /* suppress most output */
force:1, /* write output to links */
- isterm:1, /* is child process running as terminal */
- die:1; /* terminate program */
-
- sigset_t sigset; /* catch SIGCHLD and SIGWINCH with signalfd() */
- sigset_t sigorg; /* original signal mask */
- int sigfd; /* file descriptor for signalfd() */
+ isterm:1; /* is child process running as terminal */
};
-static void restore_tty(struct script_control *ctl, int mode);
-static void __attribute__((__noreturn__)) fail(struct script_control *ctl);
-static uint64_t log_info(struct script_control *ctl, const char *name, const char *msgfmt, ...);
+static ssize_t log_info(struct script_control *ctl, const char *name, const char *msgfmt, ...);
static void script_init_debug(void)
{
return log;
}
-static void log_close(struct script_control *ctl,
+static int log_close(struct script_control *ctl,
struct script_log *log,
const char *msg,
int status)
{
+ int rc = 0;
+
if (!log->initialized)
- return;
+ return 0;
DBG(MISC, ul_debug("closing %s", log->filename));
break;
}
- if (close_stream(log->fp) != 0)
- err(EXIT_FAILURE, "write failed: %s", log->filename);
+ if (close_stream(log->fp) != 0) {
+ warn(_("write failed: %s"), log->filename);
+ rc = -errno;
+ }
log->fp = NULL;
log->initialized = 0;
+
+ return rc;
}
-static void log_start(struct script_control *ctl,
+static int log_start(struct script_control *ctl,
struct script_log *log)
{
if (log->initialized)
- return;
+ return 0;
DBG(MISC, ul_debug("opening %s", log->filename));
"a" UL_CLOEXECSTR :
"w" UL_CLOEXECSTR);
if (!log->fp) {
- restore_tty(ctl, TCSANOW);
warn(_("cannot open %s"), log->filename);
- fail(ctl);
+ return -errno;
}
/* write header, etc. */
}
log->initialized = 1;
+ return 0;
}
-static void start_logging(struct script_control *ctl)
+static int start_logging(struct script_control *ctl)
{
size_t i;
/* start all output logs */
- for (i = 0; i < ctl->out.nlogs; i++)
- log_start(ctl, ctl->out.logs[i]);
+ for (i = 0; i < ctl->out.nlogs; i++) {
+ int rc = log_start(ctl, ctl->out.logs[i]);
+ if (rc)
+ return rc;
+ }
/* start all input logs */
- for (i = 0; i < ctl->in.nlogs; i++)
- log_start(ctl, ctl->in.logs[i]);
+ for (i = 0; i < ctl->in.nlogs; i++) {
+ int rc = log_start(ctl, ctl->in.logs[i]);
+ if (rc)
+ return rc;
+ }
+ return 0;
}
-static size_t log_write(struct script_control *ctl,
+static ssize_t log_write(struct script_control *ctl,
struct script_stream *stream,
struct script_log *log,
char *obuf, size_t bytes)
{
+ int rc;
+ ssize_t ssz = 0;
+ struct timeval now, delta;
+
if (!log->fp)
return 0;
- DBG(IO, ul_debug(" writining %s", log->filename));
+ DBG(IO, ul_debug(" writing [file=%s]", log->filename));
switch (log->format) {
case SCRIPT_FMT_RAW:
- if (fwrite_all(obuf, 1, bytes, log->fp)) {
+ DBG(IO, ul_debug(" log raw data"));
+ rc = fwrite_all(obuf, 1, bytes, log->fp);
+ if (rc) {
warn(_("cannot write %s"), log->filename);
- fail(ctl);
+ return rc;
}
+ ssz = bytes;
break;
- case SCRIPT_FMT_TIMING_SIMPLE:
- {
- struct timeval now, delta;
- int sz;
- DBG(IO, ul_debug(" writing timing info"));
+ case SCRIPT_FMT_TIMING_SIMPLE:
+ DBG(IO, ul_debug(" log timing info"));
gettime_monotonic(&now);
timersub(&now, &log->oldtime, &delta);
- sz = fprintf(log->fp, "%ld.%06ld %zd\n",
+ ssz = fprintf(log->fp, "%ld.%06ld %zd\n",
(long)delta.tv_sec, (long)delta.tv_usec, bytes);
+ if (ssz < 0)
+ return -errno;
+
log->oldtime = now;
- bytes = sz > 0 ? sz : 0;
break;
- }
- case SCRIPT_FMT_TIMING_MULTI:
- {
- struct timeval now, delta;
- int sz;
- DBG(IO, ul_debug(" writing multi-stream timing info"));
+ case SCRIPT_FMT_TIMING_MULTI:
+ DBG(IO, ul_debug(" log multi-stream timing info"));
gettime_monotonic(&now);
timersub(&now, &log->oldtime, &delta);
- sz = fprintf(log->fp, "%c %ld.%06ld %zd\n",
+ ssz = fprintf(log->fp, "%c %ld.%06ld %zd\n",
stream->ident,
(long)delta.tv_sec, (long)delta.tv_usec, bytes);
+ if (ssz < 0)
+ return -errno;
+
log->oldtime = now;
- bytes = sz > 0 ? sz : 0;
- }
+ break;
default:
break;
}
if (ctl->flush)
fflush(log->fp);
-
- return bytes;
+ return ssz;
}
-static uint64_t log_stream_activity(
+static ssize_t log_stream_activity(
struct script_control *ctl,
struct script_stream *stream,
char *buf, size_t bytes)
{
size_t i;
- uint64_t outsz = 0;
+ ssize_t outsz = 0;
- for (i = 0; i < stream->nlogs; i++)
- outsz += log_write(ctl, stream, stream->logs[i], buf, bytes);
+ for (i = 0; i < stream->nlogs; i++) {
+ ssize_t ssz = log_write(ctl, stream, stream->logs[i], buf, bytes);
+
+ if (ssz < 0)
+ return ssz;
+ outsz += ssz;
+ }
return outsz;
}
-static uint64_t log_signal(struct script_control *ctl, int signum, char *msgfmt, ...)
+static ssize_t log_signal(struct script_control *ctl, int signum, char *msgfmt, ...)
{
struct script_log *log;
struct timeval now, delta;
char msg[BUFSIZ] = {0};
va_list ap;
- int sz;
+ ssize_t sz;
assert(ctl);
signum_to_signame(signum));
log->oldtime = now;
- return sz > 0 ? sz : 0;
+ return sz;
}
-static uint64_t log_info(struct script_control *ctl, const char *name, const char *msgfmt, ...)
+static ssize_t log_info(struct script_control *ctl, const char *name, const char *msgfmt, ...)
{
struct script_log *log;
char msg[BUFSIZ] = {0};
va_list ap;
- int sz;
+ ssize_t sz;
assert(ctl);
else
sz = fprintf(log->fp, "H %f %s\n", 0.0, name);
- return sz > 0 ? sz : 0;
-}
-
-static void die_if_link(struct script_control *ctl, const char *filename)
-{
- struct stat s;
-
- if (ctl->force)
- return;
- if (lstat(filename, &s) == 0 && (S_ISLNK(s.st_mode) || s.st_nlink > 1))
- errx(EXIT_FAILURE,
- _("output file `%s' is a link\n"
- "Use --force if you really want to use it.\n"
- "Program not started."), filename);
-}
-
-static void restore_tty(struct script_control *ctl, int mode)
-{
- struct termios rtt;
-
- if (!ctl->isterm)
- return;
-
- rtt = ctl->attrs;
- tcsetattr(STDIN_FILENO, mode, &rtt);
+ return sz;
}
-static void enable_rawmode_tty(struct script_control *ctl)
-{
- struct termios rtt;
-
- if (!ctl->isterm)
- return;
-
- rtt = ctl->attrs;
- cfmakeraw(&rtt);
- rtt.c_lflag &= ~ECHO;
- tcsetattr(STDIN_FILENO, TCSANOW, &rtt);
-}
-static void __attribute__((__noreturn__)) done_log(struct script_control *ctl, const char *msg)
+static void log_done(struct script_control *ctl, const char *msg)
{
int status;
size_t i;
- DBG(MISC, ul_debug("done!"));
-
- restore_tty(ctl, TCSADRAIN);
+ DBG(MISC, ul_debug("stop logging"));
if (WIFSIGNALED(ctl->childstatus))
status = WTERMSIG(ctl->childstatus) + 0x80;
else
status = WEXITSTATUS(ctl->childstatus);
-
DBG(MISC, ul_debug(" status=%d", status));
/* close all output logs */
/* close all input logs */
for (i = 0; i < ctl->in.nlogs; i++)
log_close(ctl, ctl->in.logs[i], msg, status);
-
- if (!ctl->quiet)
- printf(_("Script done.\n"));
-
-#ifdef HAVE_LIBUTEMPTER
- if (ctl->master >= 0)
- utempter_remove_record(ctl->master);
-#endif
- kill(ctl->child, SIGTERM); /* make sure we don't create orphans */
-
- exit(ctl->rc_wanted ? status : EXIT_SUCCESS);
-}
-
-static void __attribute__((__noreturn__)) done(struct script_control *ctl)
-{
- done_log(ctl, NULL);
}
-static void __attribute__((__noreturn__)) fail(struct script_control *ctl)
-{
- DBG(MISC, ul_debug("fail!"));
- kill(0, SIGTERM);
- done(ctl);
-}
-
-static void wait_for_child(struct script_control *ctl, int wait)
+static void wait_for_child(void *data)
{
+ struct script_control *ctl = (struct script_control *) data;
int status;
pid_t pid;
- int options = wait ? 0 : WNOHANG;
+ int options = 0;
- DBG(MISC, ul_debug("waiting for child"));
-
- while ((pid = wait3(&status, options, NULL)) > 0)
- if (pid == ctl->child)
- ctl->childstatus = status;
-}
+ if (ctl->child == (pid_t) -1)
+ return;
-/* data from master to stdout */
-static void write_output(struct script_control *ctl, char *obuf,
- ssize_t bytes)
-{
- DBG(IO, ul_debug(" writing to output"));
+ DBG(MISC, ul_debug("waiting for child"));
- if (write_all(STDOUT_FILENO, obuf, bytes)) {
- DBG(IO, ul_debug(" writing output *failed*"));
- warn(_("write failed"));
- fail(ctl);
+ if (ul_pty_is_running(ctl->pty)) {
+ /* wait for specific child */
+ options = WNOHANG;
+ for (;;) {
+ pid = waitpid(ctl->child, &status, options);
+ if (pid != (pid_t) - 1) {
+ ctl->childstatus = status;
+ ctl->child = (pid_t) -1;
+ ul_pty_set_child(ctl->pty, (pid_t) -1);
+ } else
+ break;
+ }
+ } else {
+ /* final wait */
+ while ((pid = wait3(&status, options, NULL)) > 0) {
+ if (pid == ctl->child) {
+ ctl->childstatus = status;
+ ctl->child = (pid_t) -1;
+ ul_pty_set_child(ctl->pty, (pid_t) -1);
+ }
+ }
}
}
-static int write_to_shell(struct script_control *ctl,
- char *buf, size_t bufsz)
+static void callback_child_sigstop(void *data)
{
- return write_all(ctl->master, buf, bufsz);
+ struct script_control *ctl = (struct script_control *) data;
+
+ DBG(SIGNAL, ul_debug(" child stop by SIGSTOP -- stop parent too"));
+ kill(getpid(), SIGSTOP);
+ DBG(SIGNAL, ul_debug(" resume"));
+ kill(ctl->child, SIGCONT);
}
-/*
- * The script(1) is usually faster than shell, so it's a good idea to wait until
- * the previous message has been already read by shell from slave before we
- * write to master. This is necessary especially for EOF situation when we can
- * send EOF to master before shell is fully initialized, to workaround this
- * problem we wait until slave is empty. For example:
- *
- * echo "date" | script
- *
- * Unfortunately, the child (usually shell) can ignore stdin at all, so we
- * don't wait forever to avoid dead locks...
- *
- * Note that script is primarily designed for interactive sessions as it
- * maintains master+slave tty stuff within the session. Use pipe to write to
- * script(1) and assume non-interactive (tee-like) behavior is NOT well
- * supported.
- */
-static void write_eof_to_shell(struct script_control *ctl)
+static int callback_log_stream_activity(void *data, int fd, char *buf, size_t bufsz)
{
- unsigned int tries = 0;
- struct pollfd fds[] = {
- { .fd = ctl->slave, .events = POLLIN }
- };
- char c = DEF_EOF;
+ struct script_control *ctl = (struct script_control *) data;
+ ssize_t ssz = 0;
- DBG(IO, ul_debug(" waiting for empty slave"));
- while (poll(fds, 1, 10) == 1 && tries < 8) {
- DBG(IO, ul_debug(" slave is not empty"));
- xusleep(250000);
- tries++;
- }
- if (tries < 8)
- DBG(IO, ul_debug(" slave is empty now"));
+ DBG(IO, ul_debug("stream activity callback"));
- DBG(IO, ul_debug(" sending EOF to master"));
- write_to_shell(ctl, &c, sizeof(char));
-}
+ /* from stdin (user) to command */
+ if (fd == STDIN_FILENO)
+ ssz = log_stream_activity(ctl, &ctl->in, buf, (size_t) bufsz);
-static void handle_io(struct script_control *ctl, int fd, int *eof)
-{
- char buf[BUFSIZ];
- ssize_t bytes;
- DBG(IO, ul_debug("%d FD active", fd));
- *eof = 0;
-
- /* read from active FD */
- bytes = read(fd, buf, sizeof(buf));
- if (bytes < 0) {
- if (errno == EAGAIN || errno == EINTR)
- return;
- fail(ctl);
- }
+ /* from command (master) to stdout and log */
+ else if (fd == ul_pty_get_childfd(ctl->pty))
+ ssz = log_stream_activity(ctl, &ctl->out, buf, (size_t) bufsz);
- if (bytes == 0) {
- *eof = 1;
- return;
- }
+ if (ssz < 0)
+ return (int) ssz;
- /* from stdin (user) to command */
- if (fd == STDIN_FILENO) {
- DBG(IO, ul_debug(" stdin --> master %zd bytes", bytes));
+ DBG(IO, ul_debug(" append %ld bytes [summary=%zu, max=%zu]", ssz,
+ ctl->outsz, ctl->maxsz));
- if (write_to_shell(ctl, buf, bytes)) {
- warn(_("write failed"));
- fail(ctl);
- }
- /* without sync write_output() will write both input &
- * shell output that looks like double echoing */
- fdatasync(ctl->master);
- ctl->outsz += log_stream_activity(ctl, &ctl->in, buf, (size_t) bytes);
+ ctl->outsz += ssz;
- /* from command (master) to stdout and log */
- } else if (fd == ctl->master) {
- DBG(IO, ul_debug(" master --> stdout %zd bytes", bytes));
- write_output(ctl, buf, bytes);
- ctl->outsz += log_stream_activity(ctl, &ctl->out, buf, (size_t) bytes);
- }
/* check output limit */
if (ctl->maxsz != 0 && ctl->outsz >= ctl->maxsz) {
if (!ctl->quiet)
printf(_("Script terminated, max output files size %"PRIu64" exceeded.\n"), ctl->maxsz);
DBG(IO, ul_debug("output size %"PRIu64", exceeded limit %"PRIu64, ctl->outsz, ctl->maxsz));
- done_log(ctl, _("max output size exceeded"));
+ log_done(ctl, _("max output size exceeded"));
+ return 1;
}
+ return 0;
}
-static void handle_signal(struct script_control *ctl, int fd)
+static int callback_log_signal(void *data, struct signalfd_siginfo *info, void *sigdata)
{
- struct signalfd_siginfo info;
- ssize_t bytes;
+ struct script_control *ctl = (struct script_control *) data;
+ ssize_t ssz = 0;
- DBG(SIGNAL, ul_debug("signal FD %d active", fd));
-
- bytes = read(fd, &info, sizeof(info));
- if (bytes != sizeof(info)) {
- if (bytes < 0 && (errno == EAGAIN || errno == EINTR))
- return;
- fail(ctl);
- }
-
- switch (info.ssi_signo) {
- case SIGCHLD:
- DBG(SIGNAL, ul_debug(" get signal SIGCHLD [ssi_code=%d, ssi_status=%d]",
- info.ssi_code, info.ssi_status));
- if (info.ssi_code == CLD_EXITED
- || info.ssi_code == CLD_KILLED
- || info.ssi_code == CLD_DUMPED) {
- wait_for_child(ctl, 0);
- ctl->poll_timeout = 10;
-
- /* In case of ssi_code is CLD_TRAPPED, CLD_STOPPED, or CLD_CONTINUED */
- } else if (info.ssi_status == SIGSTOP && ctl->child) {
- DBG(SIGNAL, ul_debug(" child stop by SIGSTOP -- stop parent too"));
- kill(getpid(), SIGSTOP);
- DBG(SIGNAL, ul_debug(" resume"));
- kill(ctl->child, SIGCONT);
- }
- return;
+ switch (info->ssi_signo) {
case SIGWINCH:
- DBG(SIGNAL, ul_debug(" get signal SIGWINCH"));
- if (ctl->isterm) {
- ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&ctl->win);
- ioctl(ctl->slave, TIOCSWINSZ, (char *)&ctl->win);
- log_signal(ctl, info.ssi_signo,
- "ROWS=%d COLS=%d",
- ctl->win.ws_row,
- ctl->win.ws_col);
- }
+ {
+ struct winsize *win = (struct winsize *) sigdata;
+ ssz = log_signal(ctl, info->ssi_signo, "ROWS=%d COLS=%d",
+ win->ws_row, win->ws_col);
break;
+ }
case SIGTERM:
/* fallthrough */
case SIGINT:
/* fallthrough */
case SIGQUIT:
- log_signal(ctl, info.ssi_signo, NULL);
- DBG(SIGNAL, ul_debug(" get signal SIG{TERM,INT,QUIT}"));
- fprintf(stderr, _("\nSession terminated.\n"));
- /* Child termination is going to generate SIGCHILD (see above) */
- kill(ctl->child, SIGTERM);
- return;
+ ssz = log_signal(ctl, info->ssi_signo, NULL);
+ break;
default:
- abort();
- }
- DBG(SIGNAL, ul_debug("signal handle on FD %d done", fd));
-}
-
-static void do_io(struct script_control *ctl)
-{
- int ret, eof = 0;
- enum {
- POLLFD_SIGNAL = 0,
- POLLFD_MASTER,
- POLLFD_STDIN
-
- };
- struct pollfd pfd[] = {
- [POLLFD_SIGNAL] = { .fd = ctl->sigfd, .events = POLLIN | POLLERR | POLLHUP },
- [POLLFD_MASTER] = { .fd = ctl->master, .events = POLLIN | POLLERR | POLLHUP },
- [POLLFD_STDIN] = { .fd = STDIN_FILENO, .events = POLLIN | POLLERR | POLLHUP }
- };
-
- while (!ctl->die) {
- size_t i;
- int errsv;
-
- DBG(POLL, ul_debug("calling poll()"));
-
- /* wait for input or signal */
- ret = poll(pfd, ARRAY_SIZE(pfd), ctl->poll_timeout);
- errsv = errno;
- DBG(POLL, ul_debug("poll() rc=%d", ret));
-
- if (ret < 0) {
- if (errsv == EAGAIN)
- continue;
- warn(_("poll failed"));
- fail(ctl);
- }
- if (ret == 0) {
- DBG(POLL, ul_debug("setting die=1"));
- ctl->die = 1;
- break;
- }
-
- for (i = 0; i < ARRAY_SIZE(pfd); i++) {
- if (pfd[i].revents == 0)
- continue;
-
- DBG(POLL, ul_debug(" active pfd[%s].fd=%d %s %s %s",
- i == POLLFD_STDIN ? "stdin" :
- i == POLLFD_MASTER ? "master" :
- i == POLLFD_SIGNAL ? "signal" : "???",
- pfd[i].fd,
- pfd[i].revents & POLLIN ? "POLLIN" : "",
- pfd[i].revents & POLLHUP ? "POLLHUP" : "",
- pfd[i].revents & POLLERR ? "POLLERR" : ""));
- switch (i) {
- case POLLFD_STDIN:
- case POLLFD_MASTER:
- /* data */
- if (pfd[i].revents & POLLIN)
- handle_io(ctl, pfd[i].fd, &eof);
- /* EOF maybe detected by two ways:
- * A) poll() return POLLHUP event after close()
- * B) read() returns 0 (no data) */
- if ((pfd[i].revents & POLLHUP) || eof) {
- DBG(POLL, ul_debug(" ignore FD"));
- pfd[i].fd = -1;
- if (i == POLLFD_STDIN) {
- write_eof_to_shell(ctl);
- DBG(POLL, ul_debug(" ignore STDIN"));
- }
- }
- continue;
- case POLLFD_SIGNAL:
- handle_signal(ctl, pfd[i].fd);
- break;
- }
- }
- }
-
- DBG(POLL, ul_debug("poll() done"));
-
- if (!ctl->die)
- wait_for_child(ctl, 1);
-
- done(ctl);
-}
-
-static void getslave(struct script_control *ctl)
-{
-#ifndef HAVE_LIBUTIL
- ctl->line[strlen("/dev/")] = 't';
- ctl->slave = open(ctl->line, O_RDWR | O_CLOEXEC);
- if (ctl->slave < 0) {
- warn(_("cannot open %s"), ctl->line);
- fail(ctl);
- }
- if (ctl->isterm) {
- tcsetattr(ctl->slave, TCSANOW, &ctl->attrs);
- ioctl(ctl->slave, TIOCSWINSZ, (char *)&ctl->win);
+ /* no log */
+ break;
}
-#endif
- setsid();
- ioctl(ctl->slave, TIOCSCTTY, 0);
-}
-
-/* don't use DBG() stuff here otherwise it will be in the typescript file */
-static void __attribute__((__noreturn__)) do_shell(struct script_control *ctl)
-{
- char *shname;
-
- getslave(ctl);
-
- /* close things irrelevant for this process */
- close(ctl->master);
- close(ctl->sigfd);
-
- dup2(ctl->slave, STDIN_FILENO);
- dup2(ctl->slave, STDOUT_FILENO);
- dup2(ctl->slave, STDERR_FILENO);
- close(ctl->slave);
-
- ctl->master = -1;
-
- shname = strrchr(ctl->shell, '/');
- if (shname)
- shname++;
- else
- shname = ctl->shell;
-
- sigprocmask(SIG_SETMASK, &ctl->sigorg, NULL);
-
- /*
- * When invoked from within /etc/csh.login, script spawns a csh shell
- * that spawns programs that cannot be killed with a SIGTERM. This is
- * because csh has a documented behavior wherein it disables all
- * signals when processing the /etc/csh.* files.
- *
- * Let's restore the default behavior.
- */
- signal(SIGTERM, SIG_DFL);
- if (access(ctl->shell, X_OK) == 0) {
- if (ctl->command)
- execl(ctl->shell, shname, "-c", ctl->command, NULL);
- else
- execl(ctl->shell, shname, "-i", NULL);
- } else {
- if (ctl->command)
- execlp(shname, "-c", ctl->command, NULL);
- else
- execlp(shname, "-i", NULL);
- }
- warn(_("failed to execute %s"), ctl->shell);
- fail(ctl);
+ return ssz < 0 ? ssz : 0;
}
-
-static void getmaster(struct script_control *ctl)
+static void die_if_link(struct script_control *ctl, const char *filename)
{
-#if defined(HAVE_LIBUTIL) && defined(HAVE_PTY_H)
- int rc;
-
- ctl->isterm = isatty(STDIN_FILENO);
-
- if (ctl->isterm) {
- if (tcgetattr(STDIN_FILENO, &ctl->attrs) != 0)
- err(EXIT_FAILURE, _("failed to get terminal attributes"));
- ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&ctl->win);
- rc = openpty(&ctl->master, &ctl->slave, NULL, &ctl->attrs, &ctl->win);
- } else
- rc = openpty(&ctl->master, &ctl->slave, NULL, NULL, NULL);
-
- if (rc < 0) {
- warn(_("openpty failed"));
- fail(ctl);
- }
-#else
- char *pty, *bank, *cp;
-
- ctl->isterm = isatty(STDIN_FILENO);
-
- pty = &ctl->line[strlen("/dev/ptyp")];
- for (bank = "pqrs"; *bank; bank++) {
- ctl->line[strlen("/dev/pty")] = *bank;
- *pty = '0';
- if (access(ctl->line, F_OK) != 0)
- break;
- for (cp = "0123456789abcdef"; *cp; cp++) {
- *pty = *cp;
- ctl->master = open(ctl->line, O_RDWR | O_CLOEXEC);
- if (ctl->master >= 0) {
- char *tp = &ctl->line[strlen("/dev/")];
- int ok;
-
- /* verify slave side is usable */
- *tp = 't';
- ok = access(ctl->line, R_OK | W_OK) == 0;
- *tp = 'p';
- if (ok) {
- if (ctl->isterm) {
- tcgetattr(STDIN_FILENO, &ctl->attrs);
- ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&ctl->win);
- }
- return;
- }
- close(ctl->master);
- ctl->master = -1;
- }
- }
- }
- ctl->master = -1;
- warn(_("out of pty's"));
- fail(ctl);
-#endif /* not HAVE_LIBUTIL */
+ struct stat s;
- DBG(IO, ul_debug("master fd: %d", ctl->master));
+ if (ctl->force)
+ return;
+ if (lstat(filename, &s) == 0 && (S_ISLNK(s.st_mode) || s.st_nlink > 1))
+ errx(EXIT_FAILURE,
+ _("output file `%s' is a link\n"
+ "Use --force if you really want to use it.\n"
+ "Program not started."), filename);
}
int main(int argc, char **argv)
{
struct script_control ctl = {
-#if !HAVE_LIBUTIL || !HAVE_PTY_H
- .line = "/dev/ptyXX",
-#endif
- .master = -1,
- .slave = -1,
-
.out = { .ident = 'O' },
.in = { .ident = 'I' },
-
- .poll_timeout = -1
};
- int ch, format = 0;
+ struct ul_pty_callbacks *cb;
+ int ch, format = 0, caught_signal = 0, rc = 0;
const char *outfile = NULL, *infile = NULL;
- const char *timingfile = NULL;
+ const char *timingfile = NULL, *shell = NULL, *command = NULL;
enum { FORCE_OPTION = CHAR_MAX + 1 };
close_stdout_atexit();
script_init_debug();
+ ON_DBG(PTY, ul_pty_init_debug(0xFFFF));
while ((ch = getopt_long(argc, argv, "aB:c:efI:O:o:qm:T:t::Vh", longopts, NULL)) != -1) {
ctl.append = 1;
break;
case 'c':
- ctl.command = optarg;
+ command = optarg;
break;
case 'e':
ctl.rc_wanted = 1;
log_associate(&ctl, &ctl.in, timingfile, format);
}
- ctl.shell = getenv("SHELL");
- if (ctl.shell == NULL)
- ctl.shell = _PATH_BSHELL;
+ shell = getenv("SHELL");
+ if (!shell)
+ shell = _PATH_BSHELL;
- getmaster(&ctl);
+ ctl.isterm = isatty(STDIN_FILENO);
+ ctl.pty = ul_new_pty(ctl.isterm);
+ if (!ctl.pty)
+ err(EXIT_FAILURE, "failed to allocate PTY handler");
+
+ ul_pty_set_callback_data(ctl.pty, (void *) &ctl);
+ cb = ul_pty_get_callbacks(ctl.pty);
+ cb->child_wait = wait_for_child;
+ cb->child_sigstop = callback_child_sigstop;
+ cb->log_stream_activity = callback_log_stream_activity;
+ cb->log_signal = callback_log_signal;
if (!ctl.quiet) {
printf(_("Script started"));
printf(_(", timing file is '%s'"), timingfile);
printf(_(".\n"));
}
- enable_rawmode_tty(&ctl);
+
+ if (ul_pty_setup(ctl.pty))
+ err(EXIT_FAILURE, _("failed to create pseudo-terminal"));
+
+ fflush(stdout);
+
+ /*
+ * We have terminal, do not use err() from now, use "goto done"
+ */
#ifdef HAVE_LIBUTEMPTER
- utempter_add_record(ctl.master, NULL);
+ utempter_add_record(ul_pty_get_childfd(ctl.pty), NULL);
#endif
- /* setup signal handler */
- sigemptyset(&ctl.sigset);
- sigaddset(&ctl.sigset, SIGCHLD);
- sigaddset(&ctl.sigset, SIGWINCH);
- sigaddset(&ctl.sigset, SIGTERM);
- sigaddset(&ctl.sigset, SIGINT);
- sigaddset(&ctl.sigset, SIGQUIT);
- /* block signals used for signalfd() to prevent the signals being
- * handled according to their default dispositions */
- sigprocmask(SIG_BLOCK, &ctl.sigset, &ctl.sigorg);
+ switch ((int) (ctl.child = fork())) {
+ case -1: /* error */
+ warn(_("cannot create child process"));
+ rc = -errno;
+ goto done;
- if ((ctl.sigfd = signalfd(-1, &ctl.sigset, SFD_CLOEXEC)) < 0)
- err(EXIT_FAILURE, _("cannot set signal handler"));
+ case 0: /* child */
+ {
+ const char *shname;
- DBG(SIGNAL, ul_debug("signal fd=%d", ctl.sigfd));
+ ul_pty_init_slave(ctl.pty);
- fflush(stdout);
- ctl.child = fork();
+ signal(SIGTERM, SIG_DFL); /* because /etc/csh.login */
- switch (ctl.child) {
- case -1: /* error */
- warn(_("fork failed"));
- fail(&ctl);
+ shname = strrchr(shell, '/');
+ shname = shname ? shname + 1 : shell;
+
+ if (command)
+ execl(shell, shname, "-c", command, NULL);
+ else
+ execl(shell, shname, "-i", NULL);
+ err(EXIT_FAILURE, "failed to execute %s", shell);
break;
- case 0: /* child */
- do_shell(&ctl);
+ }
+ default:
break;
- default: /* parent */
- start_logging(&ctl);
-
- if (timingfile && format == SCRIPT_FMT_TIMING_MULTI) {
- char buf[FORMAT_TIMESTAMP_MAX];
- time_t tvec = script_time((time_t *)NULL);
-
- strtime_iso(&tvec, ISO_TIMESTAMP, buf, sizeof(buf));
- log_info(&ctl, "START_TIME", buf);
-
- if (ctl.isterm) {
- init_terminal_info(&ctl);
- log_info(&ctl, "TERM", ctl.ttytype);
- log_info(&ctl, "TTY", ctl.ttyname);
- log_info(&ctl, "COLUMNS", "%d", ctl.ttycols);
- log_info(&ctl, "LINES", "%d", ctl.ttylines);
- }
- log_info(&ctl, "SHELL", ctl.shell);
- log_info(&ctl, "TIMING_LOG", timingfile);
- if (outfile)
- log_info(&ctl, "OUTPUT_LOG", outfile);
- if (infile)
- log_info(&ctl, "INPUT_LOG", infile);
+ }
+
+ /* parent */
+ ul_pty_set_child(ctl.pty, ctl.child);
+
+ rc = start_logging(&ctl);
+ if (rc)
+ goto done;
+
+ if (timingfile && format == SCRIPT_FMT_TIMING_MULTI) {
+ char buf[FORMAT_TIMESTAMP_MAX];
+ time_t tvec = script_time((time_t *)NULL);
+
+ strtime_iso(&tvec, ISO_TIMESTAMP, buf, sizeof(buf));
+ log_info(&ctl, "START_TIME", buf);
+
+ if (ctl.isterm) {
+ init_terminal_info(&ctl);
+ log_info(&ctl, "TERM", ctl.ttytype);
+ log_info(&ctl, "TTY", ctl.ttyname);
+ log_info(&ctl, "COLUMNS", "%d", ctl.ttycols);
+ log_info(&ctl, "LINES", "%d", ctl.ttylines);
}
- do_io(&ctl);
- break;
+ log_info(&ctl, "SHELL", shell);
+ if (command)
+ log_info(&ctl, "COMMAND", command);
+ log_info(&ctl, "TIMING_LOG", timingfile);
+ if (outfile)
+ log_info(&ctl, "OUTPUT_LOG", outfile);
+ if (infile)
+ log_info(&ctl, "INPUT_LOG", infile);
+ }
+
+ /* this is the main loop */
+ rc = ul_pty_proxy_master(ctl.pty);
+
+ /* all done; cleanup and kill */
+ caught_signal = ul_pty_get_delivered_signal(ctl.pty);
+
+ if (!caught_signal && ctl.child != (pid_t)-1)
+ wait_for_child(&ctl); /* final wait */
+
+ if (caught_signal && ctl.child != (pid_t)-1) {
+ fprintf(stderr, "\nSession terminated, killing shell...");
+ kill(ctl.child, SIGTERM);
+ sleep(2);
+ kill(ctl.child, SIGKILL);
+ fprintf(stderr, " ...killed.\n");
+ }
+
+done:
+ ul_pty_cleanup(ctl.pty);
+ log_done(&ctl, NULL);
+
+ if (!ctl.quiet)
+ printf(_("Script done.\n"));
+
+#ifdef HAVE_LIBUTEMPTER
+ if (ul_pty_get_childfd(ctl.pty) >= 0)
+ utempter_remove_record(ul_pty_get_childfd(ctl.pty));
+#endif
+ ul_free_pty(ctl.pty);
+
+ /* default exit code */
+ rc = rc ? EXIT_FAILURE : EXIT_SUCCESS;
+
+ /* exit code based on child status */
+ if (ctl.rc_wanted && rc == EXIT_SUCCESS) {
+ if (WIFSIGNALED(ctl.childstatus))
+ rc = WTERMSIG(ctl.childstatus) + 0x80;
+ else
+ rc = WEXITSTATUS(ctl.childstatus);
}
- /* should not happen, all used functions are non-return */
- return EXIT_FAILURE;
+ DBG(MISC, ul_debug("done [rc=%d]", rc));
+ return rc;
}
projects / thirdparty / util-linux.git / commitdiff
