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/* Basic tests for Linux SYSV semaphore extensions.
Copyright (C) 2020-2024 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 <sys/ipc.h>
#include <sys/sem.h>
#include <errno.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <support/check.h>
#include <support/temp_file.h>
/* These are for the temporary file we generate. */
static char *name;
static int semid;
static void
remove_sem (void)
{
/* Enforce message queue removal in case of early test failure.
Ignore error since the sem may already have being removed. */
semctl (semid, 0, IPC_RMID, 0);
}
static void
do_prepare (int argc, char *argv[])
{
TEST_VERIFY_EXIT (create_temp_file ("tst-sysvsem.", &name) != -1);
}
#define PREPARE do_prepare
#define SEM_MODE 0644
union semun
{
int val;
struct semid_ds *buf;
unsigned short *array;
struct seminfo *__buf;
};
struct test_seminfo
{
int semmsl;
int semmns;
int semopm;
int semmni;
};
/* It tries to obtain some system-wide SysV semaphore information from /proc
to check against IPC_INFO/SEM_INFO. The /proc only returns the tunables
value of SEMMSL, SEMMNS, SEMOPM, and SEMMNI.
The kernel also returns constant value for SEMVMX, SEMMNU, SEMMAP, SEMUME,
and also SEMUSZ and SEMAEM (for IPC_INFO). The issue to check them is they
might change over kernel releases. */
static void
read_sem_stat (struct test_seminfo *tseminfo)
{
FILE *f = fopen ("/proc/sys/kernel/sem", "r");
if (f == NULL)
FAIL_UNSUPPORTED ("/proc is not mounted or /proc/sys/kernel/sem is not "
"available");
int r = fscanf (f, "%d %d %d %d",
&tseminfo->semmsl, &tseminfo->semmns, &tseminfo->semopm,
&tseminfo->semmni);
TEST_VERIFY_EXIT (r == 4);
fclose (f);
}
/* Check if the semaphore with IDX (index into the kernel's internal array)
matches the one with KEY. The CMD is either SEM_STAT or SEM_STAT_ANY. */
static bool
check_seminfo (int idx, key_t key, int cmd)
{
struct semid_ds seminfo;
int sid = semctl (idx, 0, cmd, (union semun) { .buf = &seminfo });
/* Ignore unused array slot returned by the kernel or information from
unknown semaphores. */
if ((sid == -1 && errno == EINVAL) || sid != semid)
return false;
if (sid == -1)
FAIL_EXIT1 ("semctl with SEM_STAT failed (errno=%d)", errno);
TEST_COMPARE (seminfo.sem_perm.__key, key);
TEST_COMPARE (seminfo.sem_perm.mode, SEM_MODE);
TEST_COMPARE (seminfo.sem_nsems, 1);
return true;
}
static int
do_test (void)
{
atexit (remove_sem);
key_t key = ftok (name, 'G');
if (key == -1)
FAIL_EXIT1 ("ftok failed: %m");
semid = semget (key, 1, IPC_CREAT | IPC_EXCL | SEM_MODE);
if (semid == -1)
FAIL_EXIT1 ("semget failed: %m");
struct test_seminfo tipcinfo;
read_sem_stat (&tipcinfo);
int semidx;
{
struct seminfo ipcinfo;
semidx = semctl (semid, 0, IPC_INFO, (union semun) { .__buf = &ipcinfo });
if (semidx == -1)
FAIL_EXIT1 ("semctl with IPC_INFO failed: %m");
TEST_COMPARE (ipcinfo.semmsl, tipcinfo.semmsl);
TEST_COMPARE (ipcinfo.semmns, tipcinfo.semmns);
TEST_COMPARE (ipcinfo.semopm, tipcinfo.semopm);
TEST_COMPARE (ipcinfo.semmni, tipcinfo.semmni);
}
/* Same as before but with SEM_INFO. */
{
struct seminfo ipcinfo;
semidx = semctl (semid, 0, SEM_INFO, (union semun) { .__buf = &ipcinfo });
if (semidx == -1)
FAIL_EXIT1 ("semctl with IPC_INFO failed: %m");
TEST_COMPARE (ipcinfo.semmsl, tipcinfo.semmsl);
TEST_COMPARE (ipcinfo.semmns, tipcinfo.semmns);
TEST_COMPARE (ipcinfo.semopm, tipcinfo.semopm);
TEST_COMPARE (ipcinfo.semmni, tipcinfo.semmni);
}
/* We check if the created semaphore shows in the system-wide status. */
bool found = false;
for (int i = 0; i <= semidx; i++)
{
/* We can't tell apart if SEM_STAT_ANY is not supported (kernel older
than 4.17) or if the index used is invalid. So it just check if
value returned from a valid call matches the created semaphore. */
check_seminfo (i, key, SEM_STAT_ANY);
if (check_seminfo (i, key, SEM_STAT))
{
found = true;
break;
}
}
if (!found)
FAIL_EXIT1 ("semctl with SEM_STAT/SEM_STAT_ANY could not find the "
"created semaphore");
if (semctl (semid, 0, IPC_RMID, 0) == -1)
FAIL_EXIT1 ("semctl failed: %m");
return 0;
}
#include <support/test-driver.c>
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