144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/* Smoke test for the closefrom.
|
|
Copyright (C) 2021-2022 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 <errno.h>
|
|
#include <fcntl.h>
|
|
#include <sys/resource.h>
|
|
#include <unistd.h>
|
|
|
|
#include <support/check.h>
|
|
#include <support/descriptors.h>
|
|
#include <support/xunistd.h>
|
|
#include <support/support.h>
|
|
|
|
#include <array_length.h>
|
|
|
|
#define NFDS 100
|
|
|
|
static int
|
|
closefrom_test (void)
|
|
{
|
|
struct support_descriptors *descrs = support_descriptors_list ();
|
|
|
|
int lowfd = support_open_dev_null_range (NFDS, O_RDONLY, 0600);
|
|
|
|
const int maximum_fd = lowfd + NFDS - 1;
|
|
const int half_fd = lowfd + NFDS / 2;
|
|
const int gap = lowfd + NFDS / 4;
|
|
|
|
/* Close half of the descriptors and check result. */
|
|
closefrom (half_fd);
|
|
|
|
for (int i = half_fd; i <= maximum_fd; i++)
|
|
{
|
|
TEST_COMPARE (fcntl (i, F_GETFL), -1);
|
|
TEST_COMPARE (errno, EBADF);
|
|
}
|
|
for (int i = lowfd; i < half_fd; i++)
|
|
TEST_VERIFY (fcntl (i, F_GETFL) > -1);
|
|
|
|
/* Create some gaps, close up to a threshold, and check result. */
|
|
xclose (lowfd + 35);
|
|
xclose (lowfd + 38);
|
|
xclose (lowfd + 42);
|
|
xclose (lowfd + 46);
|
|
|
|
/* Close half of the descriptors and check result. */
|
|
closefrom (gap);
|
|
for (int i = gap + 1; i < maximum_fd; i++)
|
|
{
|
|
TEST_COMPARE (fcntl (i, F_GETFL), -1);
|
|
TEST_COMPARE (errno, EBADF);
|
|
}
|
|
for (int i = lowfd; i < gap; i++)
|
|
TEST_VERIFY (fcntl (i, F_GETFL) > -1);
|
|
|
|
/* Close the remmaining but the last one. */
|
|
closefrom (lowfd + 1);
|
|
for (int i = lowfd + 1; i <= maximum_fd; i++)
|
|
{
|
|
TEST_COMPARE (fcntl (i, F_GETFL), -1);
|
|
TEST_COMPARE (errno, EBADF);
|
|
}
|
|
TEST_VERIFY (fcntl (lowfd, F_GETFL) > -1);
|
|
|
|
/* Close the last one. */
|
|
closefrom (lowfd);
|
|
TEST_COMPARE (fcntl (lowfd, F_GETFL), -1);
|
|
TEST_COMPARE (errno, EBADF);
|
|
|
|
/* Double check by check the /proc. */
|
|
support_descriptors_check (descrs);
|
|
support_descriptors_free (descrs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Check if closefrom works even when no new file descriptors can be
|
|
created. */
|
|
static int
|
|
closefrom_test_file_desc_limit (void)
|
|
{
|
|
int max_fd = NFDS;
|
|
{
|
|
struct rlimit rl;
|
|
if (getrlimit (RLIMIT_NOFILE, &rl) == -1)
|
|
FAIL_EXIT1 ("getrlimit (RLIMIT_NOFILE): %m");
|
|
|
|
max_fd = (rl.rlim_cur < max_fd ? rl.rlim_cur : max_fd);
|
|
rl.rlim_cur = max_fd;
|
|
|
|
if (setrlimit (RLIMIT_NOFILE, &rl) == 1)
|
|
FAIL_EXIT1 ("setrlimit (RLIMIT_NOFILE): %m");
|
|
}
|
|
|
|
/* Exhauste the file descriptor limit. */
|
|
int lowfd = xopen ("/dev/null", O_RDONLY, 0600);
|
|
for (;;)
|
|
{
|
|
int fd = open ("/dev/null", O_RDONLY, 0600);
|
|
if (fd == -1)
|
|
{
|
|
if (errno != EMFILE)
|
|
FAIL_EXIT1 ("open: %m");
|
|
break;
|
|
}
|
|
TEST_VERIFY_EXIT (fd < max_fd);
|
|
}
|
|
|
|
closefrom (lowfd);
|
|
for (int i = lowfd; i < NFDS; i++)
|
|
{
|
|
TEST_COMPARE (fcntl (i, F_GETFL), -1);
|
|
TEST_COMPARE (errno, EBADF);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
closefrom_test ();
|
|
closefrom_test_file_desc_limit ();
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|