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/* Check posix_spawn set controlling terminal extension.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <intprops.h>
#include <paths.h>
#include <spawn.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <termios.h>
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif
static char ptmxpath[PATH_MAX];
static int
handle_restart (const char *argv1, const char *argv2)
{
/* If process group is not changed (POSIX_SPAWN_SETPGROUP), then check
the creating process one, otherwise check against the process group
itself. */
pid_t pgrp;
if (strcmp (argv1, "setgrpr") != 0)
TEST_COMPARE (sscanf (argv1, "%d", &pgrp), 1);
else
{
pgrp = getpgrp ();
/* Check if a new process group was actually created. */
pid_t ppid = getppid ();
pid_t pgid = getpgid (ppid);
TEST_VERIFY (pgid != pgrp);
}
char *endptr;
long int tcfd = strtol (argv2, &endptr, 10);
if (*endptr != '\0' || tcfd > INT_MAX)
FAIL_EXIT1 ("invalid file descriptor name: %s", argv2);
if (tcfd != -1)
{
TEST_COMPARE (fcntl (tcfd, F_GETFD), -1);
TEST_COMPARE (errno, EBADF);
}
int fd = xopen (_PATH_TTY, O_RDONLY, 0600);
TEST_COMPARE (tcgetpgrp (fd), pgrp);
xclose (fd);
return 0;
}
static int restart;
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
static void
run_subprogram (int argc, char *argv[], const posix_spawnattr_t *attr,
const posix_spawn_file_actions_t *actions, int tcfd,
int exp_err)
{
short int flags;
TEST_COMPARE (posix_spawnattr_getflags (attr, &flags), 0);
bool setpgrp = flags & POSIX_SPAWN_SETPGROUP;
char *spargv[9];
TEST_VERIFY_EXIT (((argc - 1) + 4) < array_length (spargv));
char pgrp[INT_STRLEN_BOUND (pid_t)];
char tcfdstr[INT_STRLEN_BOUND (int)];
int i = 0;
for (; i < argc - 1; i++)
spargv[i] = argv[i + 1];
spargv[i++] = (char *) "--direct";
spargv[i++] = (char *) "--restart";
if (setpgrp)
spargv[i++] = (char *) "setgrpr";
else
{
snprintf (pgrp, sizeof pgrp, "%d", getpgrp ());
spargv[i++] = pgrp;
}
snprintf (tcfdstr, sizeof tcfdstr, "%d", tcfd);
spargv[i++] = tcfdstr;
spargv[i] = NULL;
pid_t pid;
TEST_COMPARE (posix_spawn (&pid, argv[1], actions, attr, spargv, environ),
exp_err);
if (exp_err != 0)
return;
int status;
TEST_COMPARE (xwaitpid (pid, &status, WUNTRACED), pid);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSTOPPED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
}
static int
run_test (int argc, char *argv[])
{
/* We must have either:
- four parameters left if called initially:
+ path to ld.so optional
+ "--library-path" optional
+ the library path optional
+ the application name
- six parameters left if called through re-execution:
+ --setgrpr optional
*/
int tcfd = xopen (ptmxpath, O_RDONLY, 0600);
/* Check setting the controlling terminal without changing the group. */
{
posix_spawnattr_t attr;
TEST_COMPARE (posix_spawnattr_init (&attr), 0);
posix_spawn_file_actions_t actions;
TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
TEST_COMPARE (posix_spawn_file_actions_addtcsetpgrp_np (&actions, tcfd),
0);
run_subprogram (argc, argv, &attr, &actions, -1, 0);
}
/* Check setting both the controlling terminal and the create a new process
group. */
{
posix_spawnattr_t attr;
TEST_COMPARE (posix_spawnattr_init (&attr), 0);
TEST_COMPARE (posix_spawnattr_setflags (&attr, POSIX_SPAWN_SETPGROUP), 0);
posix_spawn_file_actions_t actions;
TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
TEST_COMPARE (posix_spawn_file_actions_addtcsetpgrp_np (&actions, tcfd),
0);
run_subprogram (argc, argv, &attr, &actions, -1, 0);
}
/* Same as before, but check if the addclose file actions closes the terminal
file descriptor. */
{
posix_spawnattr_t attr;
TEST_COMPARE (posix_spawnattr_init (&attr), 0);
TEST_COMPARE (posix_spawnattr_setflags (&attr, POSIX_SPAWN_SETPGROUP), 0);
posix_spawn_file_actions_t actions;
TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
TEST_COMPARE (posix_spawn_file_actions_addtcsetpgrp_np (&actions, tcfd),
0);
TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, tcfd), 0);
run_subprogram (argc, argv, &attr, &actions, tcfd, 0);
}
/* Trying to set the controlling terminal after a setsid incurs in a ENOTTY
from tcsetpgrp. */
{
posix_spawnattr_t attr;
TEST_COMPARE (posix_spawnattr_init (&attr), 0);
TEST_COMPARE (posix_spawnattr_setflags (&attr, POSIX_SPAWN_SETSID), 0);
posix_spawn_file_actions_t actions;
TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
TEST_COMPARE (posix_spawn_file_actions_addtcsetpgrp_np (&actions, tcfd),
0);
run_subprogram (argc, argv, &attr, &actions, -1, ENOTTY);
}
xclose (tcfd);
return 0;
}
static int
do_test (int argc, char *argv[])
{
if (restart)
return handle_restart (argv[1], argv[2]);
pid_t pid = xfork ();
if (pid == 0)
{
/* Create a pseudo-terminal to avoid interfering with the one using by
test itself, creates a new session (so there is no controlling
terminal), and set the pseudo-terminal as the controlling one. */
int ptmx = posix_openpt (0);
if (ptmx == -1)
{
if (errno == ENXIO)
FAIL_UNSUPPORTED ("terminal not available, skipping test");
FAIL_EXIT1 ("posix_openpt (0): %m");
}
TEST_VERIFY_EXIT (grantpt (ptmx) == 0);
TEST_VERIFY_EXIT (unlockpt (ptmx) == 0);
TEST_VERIFY_EXIT (setsid () != -1);
TEST_VERIFY_EXIT (ioctl (ptmx, TIOCSCTTY, NULL) == 0);
while (dup2 (ptmx, STDIN_FILENO) == -1 && errno == EBUSY)
;
while (dup2 (ptmx, STDOUT_FILENO) == -1 && errno == EBUSY)
;
while (dup2 (ptmx, STDERR_FILENO) == -1 && errno == EBUSY)
;
TEST_VERIFY_EXIT (ptsname_r (ptmx, ptmxpath, sizeof ptmxpath) == 0);
xclose (ptmx);
run_test (argc, argv);
_exit (0);
}
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (WIFEXITED (status));
exit (0);
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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