189 lines
5.4 KiB
C
189 lines
5.4 KiB
C
/* Basic tests for Linux SYSV shared memory extensions.
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Copyright (C) 2020-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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#define SHM_MODE 0644
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/* These are for the temporary file we generate. */
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static char *name;
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static int shmid;
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static long int pgsz;
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static void
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remove_shm (void)
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{
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/* Enforce message queue removal in case of early test failure.
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Ignore error since the shm may already have being removed. */
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shmctl (shmid, IPC_RMID, NULL);
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}
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static void
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do_prepare (int argc, char *argv[])
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{
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TEST_VERIFY_EXIT (create_temp_file ("tst-sysvshm.", &name) != -1);
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}
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#define PREPARE do_prepare
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struct test_shminfo
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{
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__syscall_ulong_t shmall;
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__syscall_ulong_t shmmax;
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__syscall_ulong_t shmmni;
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};
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/* It tries to obtain some system-wide SysV shared memory information from
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/proc to check against IPC_INFO/SHM_INFO. The /proc only returns the
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tunables value of SHMALL, SHMMAX, and SHMMNI. */
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static uint64_t
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read_proc_file (const char *file)
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{
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FILE *f = fopen (file, "r");
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if (f == NULL)
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FAIL_UNSUPPORTED ("/proc is not mounted or %s is not available", file);
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/* Handle 32-bit binaries running on 64-bit kernels. */
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uint64_t v;
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int r = fscanf (f, "%" SCNu64, &v);
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TEST_VERIFY_EXIT (r == 1);
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fclose (f);
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return v;
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}
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/* Check if the message queue with IDX (index into the kernel's internal
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array) matches the one with KEY. The CMD is either SHM_STAT or
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SHM_STAT_ANY. */
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static bool
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check_shminfo (int idx, key_t key, int cmd)
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{
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struct shmid_ds shminfo;
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int sid = shmctl (idx, cmd, &shminfo);
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/* Ignore unused array slot returned by the kernel or information from
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unknown message queue. */
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if ((sid == -1 && errno == EINVAL) || sid != shmid)
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return false;
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if (sid == -1)
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FAIL_EXIT1 ("shmctl with %s failed: %m",
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cmd == SHM_STAT ? "SHM_STAT" : "SHM_STAT_ANY");
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TEST_COMPARE (shminfo.shm_perm.__key, key);
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TEST_COMPARE (shminfo.shm_perm.mode, SHM_MODE);
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TEST_COMPARE (shminfo.shm_segsz, pgsz);
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return true;
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}
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static int
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do_test (void)
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{
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atexit (remove_shm);
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pgsz = sysconf (_SC_PAGESIZE);
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if (pgsz == -1)
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FAIL_EXIT1 ("sysconf (_SC_PAGESIZE) failed: %m");
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key_t key = ftok (name, 'G');
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if (key == -1)
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FAIL_EXIT1 ("ftok failed: %m");
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shmid = shmget (key, pgsz, IPC_CREAT | IPC_EXCL | SHM_MODE);
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if (shmid == -1)
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FAIL_EXIT1 ("shmget failed: %m");
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/* It does not check shmmax because kernel clamp its value to INT_MAX for:
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1. Compat symbols with IPC_64, i.e, 32-bit binaries running on 64-bit
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kernels.
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2. Default symbol without IPC_64 (defined as IPC_OLD within Linux) and
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glibc always use IPC_64 for 32-bit ABIs (to support 64-bit time_t).
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It means that 32-bit binaries running on 32-bit kernels will not see
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shmmax being clamped.
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And finding out whether the compat symbol is used would require checking
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the underlying kernel against the current ABI. The shmall and shmmni
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already provided enough coverage. */
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struct test_shminfo tipcinfo;
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tipcinfo.shmall = read_proc_file ("/proc/sys/kernel/shmall");
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tipcinfo.shmmni = read_proc_file ("/proc/sys/kernel/shmmni");
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int shmidx;
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/* Note: SHM_INFO does not return a shminfo, but rather a 'struct shm_info'.
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It is tricky to verify its values since the syscall returns system wide
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resources consumed by shared memory. The shmctl implementation handles
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SHM_INFO as IPC_INFO, so the IPC_INFO test should validate SHM_INFO as
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well. */
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{
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struct shminfo ipcinfo;
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shmidx = shmctl (shmid, IPC_INFO, (struct shmid_ds *) &ipcinfo);
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if (shmidx == -1)
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FAIL_EXIT1 ("shmctl with IPC_INFO failed: %m");
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TEST_COMPARE (ipcinfo.shmall, tipcinfo.shmall);
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TEST_COMPARE (ipcinfo.shmmni, tipcinfo.shmmni);
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}
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/* We check if the created shared memory shows in the global list. */
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bool found = false;
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for (int i = 0; i <= shmidx; i++)
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{
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/* We can't tell apart if SHM_STAT_ANY is not supported (kernel older
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than 4.17) or if the index used is invalid. So it just check if
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value returned from a valid call matches the created message
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queue. */
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check_shminfo (i, key, SHM_STAT_ANY);
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if (check_shminfo (i, key, SHM_STAT))
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{
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found = true;
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break;
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}
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}
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if (!found)
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FAIL_EXIT1 ("shmctl with SHM_STAT/SHM_STAT_ANY could not find the "
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"created shared memory");
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if (shmctl (shmid, IPC_RMID, NULL) == -1)
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FAIL_EXIT1 ("shmctl failed");
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return 0;
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}
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#include <support/test-driver.c>
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