sysvipc/test-sysvsem.c

   1 /* Basic tests for SYSV semaphore functions.
   2    Copyright (C) 2016-2024 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 <intprops.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <sys/types.h>
  26 #include <sys/ipc.h>
  27 #include <sys/sem.h>
  28
  29 #include <test-sysvipc.h>
  30
  31 #include <support/support.h>
  32 #include <support/check.h>
  33 #include <support/temp_file.h>
  34 #include <support/xtime.h>
  35 #include <support/xsignal.h>
  36
  37 /* These are for the temporary file we generate.  */
  38 static char *name;
  39 static int semid;
  40
  41 static void
  42 remove_sem (void)
  43 {
  44   /* Enforce message queue removal in case of early test failure.
  45      Ignore error since the sem may already have being removed.  */
  46   semctl (semid, 0, IPC_RMID, 0);
  47 }
  48
  49 static void
  50 do_prepare (int argc, char *argv[])
  51 {
  52   int fd = create_temp_file ("tst-sysvsem.", &name);
  53   if (fd == -1)
  54     FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
  55 }
  56
  57 #define PREPARE do_prepare
  58
  59 /* It is not an extensive test, but rather a functional one aimed to check
  60    correct parameter passing on kernel.  */
  61
  62 #define SEM_MODE 0644
  63
  64 union semun
  65 {
  66   int val;
  67   struct semid_ds *buf;
  68   unsigned short  *array;
  69 };
  70
  71 static int
  72 do_test (void)
  73 {
  74   atexit (remove_sem);
  75
  76   key_t key = ftok (name, 'G');
  77   if (key == -1)
  78     FAIL_EXIT1 ("ftok failed");
  79
  80   semid = semget(key, 1, IPC_CREAT | IPC_EXCL | SEM_MODE);
  81   if (semid == -1)
  82     {
  83       if (errno == ENOSYS)
  84         FAIL_UNSUPPORTED ("msgget not supported");
  85       FAIL_EXIT1 ("semget failed (errno=%d)", errno);
  86     }
  87
  88   TEST_COMPARE (semctl (semid, 0, first_sem_invalid_cmd (), NULL), -1);
  89   TEST_COMPARE (errno, EINVAL);
  90
  91   /* Get semaphore kernel information and do some sanity checks.  */
  92   struct semid_ds seminfo;
  93   if (semctl (semid, 0, IPC_STAT, (union semun) { .buf = &seminfo }) == -1)
  94     FAIL_EXIT1 ("semctl with IPC_STAT failed (errno=%d)", errno);
  95
  96   if (seminfo.sem_perm.__key != key)
  97     FAIL_EXIT1 ("semid_ds::sem_perm::key (%d) != %d",
  98                 (int) seminfo.sem_perm.__key, (int) key);
  99   if (seminfo.sem_perm.mode != SEM_MODE)
 100     FAIL_EXIT1 ("semid_ds::sem_perm::mode (%o) != %o",
 101                 seminfo.sem_perm.mode, SEM_MODE);
 102   if (seminfo.sem_nsems != 1)
 103     FAIL_EXIT1 ("semid_ds::sem_nsems (%lu) != 1",
 104                 (long unsigned) seminfo.sem_nsems);
 105
 106   /* Some lock/unlock basic tests.  */
 107   struct sembuf sb1 = { 0, 1, 0 };
 108   if (semop (semid, &sb1, 1) == -1)
 109     FAIL_EXIT1 ("semop failed (errno=%i)", errno);
 110
 111   struct sembuf sb2 = { 0, -1, 0 };
 112   if (semop (semid, &sb2, 1) == -1)
 113     FAIL_EXIT1 ("semop failed (errno=%i)", errno);
 114
 115 #ifdef _GNU_SOURCE
 116   /* Set a time for half a second.  The semaphore operation should timeout
 117      with EAGAIN.  */
 118   {
 119     struct timespec ts = { 0 /* sec */, 500000000 /* nsec */ };
 120     if (semtimedop (semid, &sb2, 1, &ts) != -1
 121         || (errno != EAGAIN && errno != ENOSYS))
 122       FAIL_EXIT1 ("semtimedop succeed or returned errno != {EAGAIN,ENOSYS} "
 123                   "(errno=%i)", errno);
 124   }
 125
 126   {
 127     support_create_timer (0, 100000000, false, NULL);
 128     struct timespec ts = { TYPE_MAXIMUM (time_t), 0 };
 129     TEST_COMPARE (semtimedop (semid, &sb2, 1, &ts), -1);
 130     TEST_VERIFY (errno == EINTR || errno == EOVERFLOW);
 131   }
 132 #endif
 133
 134   /* Finally free up the semnaphore resource.  */
 135   if (semctl (semid, 0, IPC_RMID, 0) == -1)
 136     FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
 137
 138   return 0;
 139 }
 140
 141 #include <support/test-driver.c>