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glibc/posix/tst-spawn.c

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/* Tests for spawn.
Copyright (C) 2000-2023 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 <stdio.h>
#include <getopt.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <support/temp_file.h>
#include <support/support.h>
/* Nonzero if the program gets called via `exec'. */
static int restart;
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
/* Name of the temporary files. */
static char *name1;
static char *name2;
static char *name3;
static char *name5;
/* Descriptors for the temporary files. */
static int temp_fd1 = -1;
static int temp_fd2 = -1;
static int temp_fd3 = -1;
static int temp_fd5 = -1;
/* The contents of our files. */
static const char fd1string[] = "This file should get closed";
static const char fd2string[] = "This file should stay opened";
static const char fd3string[] = "This file will be opened";
static const char fd5string[] = "This file should stay opened (O_CLOEXEC)";
/* We have a preparation function. */
static void
do_prepare (int argc, char *argv[])
{
/* We must not open any files in the restart case. */
if (restart)
return;
TEST_VERIFY_EXIT ((temp_fd1 = create_temp_file ("spawn", &name1)) != -1);
TEST_VERIFY_EXIT ((temp_fd2 = create_temp_file ("spawn", &name2)) != -1);
TEST_VERIFY_EXIT ((temp_fd3 = create_temp_file ("spawn", &name3)) != -1);
TEST_VERIFY_EXIT ((temp_fd5 = create_temp_file ("spawn", &name5)) != -1);
int flags;
TEST_VERIFY_EXIT ((flags = fcntl (temp_fd5, F_GETFD, &flags)) != -1);
TEST_COMPARE (fcntl (temp_fd5, F_SETFD, flags | FD_CLOEXEC), 0);
}
#define PREPARE do_prepare
static int
handle_restart (const char *fd1s, const char *fd2s, const char *fd3s,
const char *fd4s, const char *name, const char *fd5s)
{
char buf[100];
int fd1;
int fd2;
int fd3;
int fd4;
int fd5;
/* First get the descriptors. */
fd1 = atol (fd1s);
fd2 = atol (fd2s);
fd3 = atol (fd3s);
fd4 = atol (fd4s);
fd5 = atol (fd5s);
/* Sanity check. */
TEST_VERIFY_EXIT (fd1 != fd2);
TEST_VERIFY_EXIT (fd1 != fd3);
TEST_VERIFY_EXIT (fd1 != fd4);
TEST_VERIFY_EXIT (fd2 != fd3);
TEST_VERIFY_EXIT (fd2 != fd4);
TEST_VERIFY_EXIT (fd3 != fd4);
TEST_VERIFY_EXIT (fd4 != fd5);
/* First the easy part: read from the file descriptor which is
supposed to be open. */
TEST_COMPARE (xlseek (fd2, 0, SEEK_CUR), strlen (fd2string));
/* The duped descriptor must have the same position. */
TEST_COMPARE (xlseek (fd4, 0, SEEK_CUR), strlen (fd2string));
TEST_COMPARE (xlseek (fd2, 0, SEEK_SET), 0);
TEST_COMPARE (xlseek (fd4, 0, SEEK_CUR), 0);
TEST_COMPARE (read (fd2, buf, sizeof buf), strlen (fd2string));
TEST_COMPARE_BLOB (fd2string, strlen (fd2string), buf, strlen (fd2string));
/* Now read from the third file. */
TEST_COMPARE (read (fd3, buf, sizeof buf), strlen (fd3string));
TEST_COMPARE_BLOB (fd3string, strlen (fd3string), buf, strlen (fd3string));
/* Try to write to the file. This should not be allowed. */
TEST_COMPARE (write (fd3, "boo!", 4), -1);
TEST_COMPARE (errno, EBADF);
/* Now try to read the first file. First make sure it is not opened. */
TEST_COMPARE (lseek (fd1, 0, SEEK_CUR), (off_t) -1);
TEST_COMPARE (errno, EBADF);
/* Now open the file and read it. */
fd1 = xopen (name, O_RDONLY, 0600);
TEST_COMPARE (read (fd1, buf, sizeof buf), strlen (fd1string));
TEST_COMPARE_BLOB (fd1string, strlen (fd1string), buf, strlen (fd1string));
TEST_COMPARE (xlseek (fd5, 0, SEEK_SET), 0);
TEST_COMPARE (read (fd5, buf, sizeof buf), strlen (fd5string));
TEST_COMPARE_BLOB (fd5string, strlen (fd5string), buf, strlen (fd5string));
return 0;
}
static int
do_test (int argc, char *argv[])
{
pid_t pid;
int fd4;
int status;
posix_spawn_file_actions_t actions;
char fd1name[18];
char fd2name[18];
char fd3name[18];
char fd4name[18];
char fd5name[18];
char *name3_copy;
char *spargv[13];
int i;
/* We must have
- one or four parameters left if called initially
+ path for ld.so optional
+ "--library-path" optional
+ the library path optional
+ the application name
- six parameters left if called through re-execution
+ file descriptor number which is supposed to be closed
+ the open file descriptor
+ the newly opened file descriptor
+ the duped second descriptor
+ the name of the closed descriptor
+ the duped fourth file descriptor which O_CLOEXEC should be
remove by adddup2.
*/
if (argc != (restart ? 7 : 2) && argc != (restart ? 7 : 5))
FAIL_EXIT1 ("wrong number of arguments (%d)", argc);
if (restart)
return handle_restart (argv[1], argv[2], argv[3], argv[4], argv[5],
argv[6]);
/* Prepare the test. We are creating four files: two which file descriptor
will be marked with FD_CLOEXEC, another which is not. */
/* Write something in the files. */
xwrite (temp_fd1, fd1string, strlen (fd1string));
xwrite (temp_fd2, fd2string, strlen (fd2string));
xwrite (temp_fd3, fd3string, strlen (fd3string));
xwrite (temp_fd5, fd5string, strlen (fd5string));
/* Close the third file. It'll be opened by `spawn'. */
xclose (temp_fd3);
/* Tell `spawn' what to do. */
TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
/* Close `temp_fd1'. */
TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, temp_fd1), 0);
/* We want to open the third file. */
name3_copy = xstrdup (name3);
TEST_COMPARE (posix_spawn_file_actions_addopen (&actions, temp_fd3,
name3_copy,
O_RDONLY, 0666),
0);
/* Overwrite the name to check that a copy has been made. */
memset (name3_copy, 'X', strlen (name3_copy));
/* We dup the second descriptor. */
fd4 = MAX (2, MAX (temp_fd1, MAX (temp_fd2, MAX (temp_fd3, temp_fd5)))) + 1;
TEST_COMPARE (posix_spawn_file_actions_adddup2 (&actions, temp_fd2, fd4),
0);
/* We clear the O_CLOEXEC on fourth descriptor, so it should be
stay open on child. */
TEST_COMPARE (posix_spawn_file_actions_adddup2 (&actions, temp_fd5,
temp_fd5),
0);
/* Now spawn the process. */
snprintf (fd1name, sizeof fd1name, "%d", temp_fd1);
snprintf (fd2name, sizeof fd2name, "%d", temp_fd2);
snprintf (fd3name, sizeof fd3name, "%d", temp_fd3);
snprintf (fd4name, sizeof fd4name, "%d", fd4);
snprintf (fd5name, sizeof fd5name, "%d", temp_fd5);
for (i = 0; i < (argc == (restart ? 7 : 5) ? 4 : 1); i++)
spargv[i] = argv[i + 1];
spargv[i++] = (char *) "--direct";
spargv[i++] = (char *) "--restart";
spargv[i++] = fd1name;
spargv[i++] = fd2name;
spargv[i++] = fd3name;
spargv[i++] = fd4name;
spargv[i++] = name1;
spargv[i++] = fd5name;
spargv[i] = NULL;
TEST_COMPARE (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ),
0);
/* Wait for the children. */
TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
/* Same test but with a NULL pid argument. */
TEST_COMPARE (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ),
0);
/* Cleanup. */
TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
free (name3_copy);
/* Wait for the children. */
xwaitpid (-1, &status, 0);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
return 0;
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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