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/* Tests for posix_spawn cgroup extension.
Copyright (C) 2023-2024 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 <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <spawn.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
#include <support/temp_file.h>
#include <sys/vfs.h>
#include <sys/wait.h>
#include <unistd.h>
#define CGROUPFS "/sys/fs/cgroup/"
#ifndef CGROUP2_SUPER_MAGIC
# define CGROUP2_SUPER_MAGIC 0x63677270
#endif
#define F_TYPE_EQUAL(a, b) (a == (typeof (a)) b)
#define CGROUP_TEST "test-spawn-cgroup"
/* Nonzero if the program gets called via `exec'. */
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
static int restart;
/* Hold the four initial argument used to respawn the process, plus the extra
'--direct', '--restart', the check type ('SIG_IGN' or 'SIG_DFL'), and a
final NULL. */
static char *spargs[8];
static inline char *
startswith (const char *s, const char *prefix)
{
size_t l = strlen (prefix);
if (strncmp (s, prefix, l) == 0)
return (char *) s + l;
return NULL;
}
static char *
get_cgroup (void)
{
FILE *f = fopen ("/proc/self/cgroup", "re");
if (f == NULL)
FAIL_UNSUPPORTED ("no cgroup defined for the process: %m");
char *cgroup = NULL;
char *line = NULL;
size_t linesiz = 0;
while (xgetline (&line, &linesiz, f) > 0)
{
char *entry = startswith (line, "0:");
if (entry == NULL)
continue;
entry = strchr (entry, ':');
if (entry == NULL)
continue;
cgroup = entry + 1;
size_t l = strlen (cgroup);
if (cgroup[l - 1] == '\n')
cgroup[l - 1] = '\0';
cgroup = xstrdup (entry + 1);
break;
}
xfclose (f);
free (line);
return cgroup;
}
/* Called on process re-execution. */
static void
handle_restart (int argc, char *argv[])
{
assert (argc == 1);
char *newcgroup = argv[0];
char *current_cgroup = get_cgroup ();
TEST_VERIFY_EXIT (current_cgroup != NULL);
TEST_COMPARE_STRING (newcgroup, current_cgroup);
}
static int
do_test_cgroup_failure (pid_t *pid, int cgroup)
{
posix_spawnattr_t attr;
TEST_COMPARE (posix_spawnattr_init (&attr), 0);
TEST_COMPARE (posix_spawnattr_setflags (&attr, POSIX_SPAWN_SETCGROUP), 0);
TEST_COMPARE (posix_spawnattr_setcgroup_np (&attr, cgroup), 0);
int cgetgroup;
TEST_COMPARE (posix_spawnattr_getcgroup_np (&attr, &cgetgroup), 0);
TEST_COMPARE (cgroup, cgetgroup);
return posix_spawn (pid, spargs[0], NULL, &attr, spargs, environ);
}
static int
create_new_cgroup (char **newcgroup)
{
struct statfs fs;
if (statfs (CGROUPFS, &fs) < 0)
{
if (errno == ENOENT)
FAIL_UNSUPPORTED ("no cgroupv2 mount found");
FAIL_EXIT1 ("statfs (%s): %m\n", CGROUPFS);
}
if (!F_TYPE_EQUAL (fs.f_type, CGROUP2_SUPER_MAGIC))
FAIL_UNSUPPORTED ("%s is not a cgroupv2 (expected %#jx, got %#jx)",
CGROUPFS, (intmax_t) CGROUP2_SUPER_MAGIC,
(intmax_t) fs.f_type);
char *cgroup = get_cgroup ();
TEST_VERIFY_EXIT (cgroup != NULL);
*newcgroup = xasprintf ("%s/%s", cgroup, CGROUP_TEST);
char *cgpath = xasprintf ("%s%s/%s", CGROUPFS, cgroup, CGROUP_TEST);
free (cgroup);
if (mkdir (cgpath, 0755) == -1 && errno != EEXIST)
{
if (errno == EACCES || errno == EPERM || errno == EROFS)
FAIL_UNSUPPORTED ("can not create a new cgroupv2 group");
FAIL_EXIT1 ("mkdir (%s): %m", cgpath);
}
add_temp_file (cgpath);
return xopen (cgpath, O_DIRECTORY | O_RDONLY | O_CLOEXEC, 0666);
}
static int
do_test (int argc, char *argv[])
{
/* We must have either:
- one or four parameters if called initially:
+ argv[1]: path for ld.so optional
+ argv[2]: "--library-path" optional
+ argv[3]: the library path optional
+ argv[4]: the application name
- six parameters left if called through re-execution:
+ argv[4/1]: the application name
+ argv[5/2]: the created cgroup
* When built with --enable-hardcoded-path-in-tests or issued without
using the loader directly. */
if (restart)
{
handle_restart (argc - 1, &argv[1]);
return 0;
}
TEST_VERIFY_EXIT (argc == 2 || argc == 5);
char *newcgroup;
int cgroup = create_new_cgroup (&newcgroup);
int i;
for (i = 0; i < argc - 1; i++)
spargs[i] = argv[i + 1];
spargs[i++] = (char *) "--direct";
spargs[i++] = (char *) "--restart";
spargs[i++] = (char *) newcgroup;
spargs[i] = NULL;
/* Check if invalid cgroups returns an error. */
{
int r = do_test_cgroup_failure (NULL, -1);
if (r == EOPNOTSUPP)
FAIL_UNSUPPORTED ("posix_spawn POSIX_SPAWN_SETCGROUP is not supported");
TEST_COMPARE (r, EINVAL);
}
{
pid_t pid;
TEST_COMPARE (do_test_cgroup_failure (&pid, cgroup), 0);
siginfo_t sinfo;
TEST_COMPARE (waitid (P_PID, pid, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_signo, SIGCHLD);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
}
xclose (cgroup);
free (newcgroup);
return 0;
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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