sysvipc/test-sysvsem.c

   1 /* Basic tests for SYSV semaphore functions.
   2    Copyright (C) 2016-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <errno.h>
  22 #include <string.h>
  23 #include <sys/types.h>
  24 #include <sys/ipc.h>
  25 #include <sys/sem.h>
  26
  27 #include <support/support.h>
  28 #include <support/check.h>
  29 #include <support/temp_file.h>
  30
  31 /* These are for the temporary file we generate.  */
  32 static char *name;
  33 static int semid;
  34
  35 static void
  36 remove_sem (void)
  37 {
  38   /* Enforce message queue removal in case of early test failure.
  39      Ignore error since the sem may already have being removed.  */
  40   semctl (semid, 0, IPC_RMID, 0);
  41 }
  42
  43 static void
  44 do_prepare (int argc, char *argv[])
  45 {
  46   int fd = create_temp_file ("tst-sysvsem.", &name);
  47   if (fd == -1)
  48     FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
  49 }
  50
  51 #define PREPARE do_prepare
  52
  53 /* It is not an extensive test, but rather a functional one aimed to check
  54    correct parameter passing on kernel.  */
  55
  56 #define SEM_MODE 0644
  57
  58 union semun
  59 {
  60   int val;
  61   struct semid_ds *buf;
  62   unsigned short  *array;
  63 };
  64
  65 static int
  66 do_test (void)
  67 {
  68   atexit (remove_sem);
  69
  70   key_t key = ftok (name, 'G');
  71   if (key == -1)
  72     FAIL_EXIT1 ("ftok failed");
  73
  74   semid = semget(key, 1, IPC_CREAT | IPC_EXCL | SEM_MODE);
  75   if (semid == -1)
  76     {
  77       if (errno == ENOSYS)
  78         FAIL_UNSUPPORTED ("msgget not supported");
  79       FAIL_EXIT1 ("semget failed (errno=%d)", errno);
  80     }
  81
  82   /* Get semaphore kernel information and do some sanity checks.  */
  83   struct semid_ds seminfo;
  84   if (semctl (semid, 0, IPC_STAT, (union semun) { .buf = &seminfo }) == -1)
  85     FAIL_EXIT1 ("semctl with IPC_STAT failed (errno=%d)", errno);
  86
  87   if (seminfo.sem_perm.__key != key)
  88     FAIL_EXIT1 ("semid_ds::sem_perm::key (%d) != %d",
  89                 (int) seminfo.sem_perm.__key, (int) key);
  90   if (seminfo.sem_perm.mode != SEM_MODE)
  91     FAIL_EXIT1 ("semid_ds::sem_perm::mode (%o) != %o",
  92                 seminfo.sem_perm.mode, SEM_MODE);
  93   if (seminfo.sem_nsems != 1)
  94     FAIL_EXIT1 ("semid_ds::sem_nsems (%lu) != 1",
  95                 (long unsigned) seminfo.sem_nsems);
  96
  97   /* Some lock/unlock basic tests.  */
  98   struct sembuf sb1 = { 0, 1, 0 };
  99   if (semop (semid, &sb1, 1) == -1)
 100     FAIL_EXIT1 ("semop failed (errno=%i)", errno);
 101
 102   struct sembuf sb2 = { 0, -1, 0 };
 103   if (semop (semid, &sb2, 1) == -1)
 104     FAIL_EXIT1 ("semop failed (errno=%i)", errno);
 105
 106 #ifdef _GNU_SOURCE
 107   /* Set a time for half a second.  The semaphore operation should timeout
 108      with EAGAIN.  */
 109   struct timespec ts = { 0 /* sec */, 500000000 /* nsec */ };
 110   if (semtimedop (semid, &sb2, 1, &ts) != -1
 111       || (errno != EAGAIN && errno != ENOSYS))
 112     FAIL_EXIT1 ("semtimedop succeed or returned errno != {EAGAIN,ENOSYS} "
 113                 "(errno=%i)", errno);
 114 #endif
 115
 116   /* Finally free up the semnaphore resource.  */
 117   if (semctl (semid, 0, IPC_RMID, 0) == -1)
 118     FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
 119
 120   return 0;
 121 }
 122
 123 #include <support/test-driver.c>