sysvipc/test-sysvshm.c

   1 /* Basic tests for SYSV shared memory functions.
   2    Copyright (C) 2016-2023 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 <unistd.h>
  24 #include <sys/types.h>
  25 #include <sys/ipc.h>
  26 #include <sys/shm.h>
  27
  28 #include <test-sysvipc.h>
  29
  30 #include <support/support.h>
  31 #include <support/check.h>
  32 #include <support/temp_file.h>
  33
  34 /* These are for the temporary file we generate.  */
  35 static char *name;
  36 static int shmid;
  37
  38 static void
  39 remove_shm (void)
  40 {
  41   /* Enforce message queue removal in case of early test failure.
  42      Ignore error since the shm may already have being removed.  */
  43   shmctl (shmid, IPC_RMID, 0);
  44 }
  45
  46 static void
  47 do_prepare (int argc, char *argv[])
  48 {
  49   int fd = create_temp_file ("tst-sysvshm.", &name);
  50   if (fd == -1)
  51     FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
  52 }
  53
  54 #define PREPARE do_prepare
  55
  56 /* It is not an extensive test, but rather a functional one aimed to check
  57    correct parameter passing on kernel.  */
  58
  59 #define CHECK_EQ(v, k) \
  60   if ((v) != (k)) \
  61     FAIL_EXIT1("%d != %d", v, k)
  62
  63 #define SHM_MODE 0666
  64
  65 static int
  66 do_test (void)
  67 {
  68   atexit (remove_shm);
  69
  70   key_t key = ftok (name, 'G');
  71   if (key == -1)
  72     FAIL_EXIT1 ("ftok failed");
  73
  74   long int pgsz = sysconf (_SC_PAGESIZE);
  75   if (pgsz == -1)
  76     FAIL_EXIT1 ("sysconf (_SC_PAGESIZE) failed (errno = %d)", errno);
  77
  78   shmid = shmget(key, pgsz, IPC_CREAT | IPC_EXCL | SHM_MODE);
  79   if (shmid == -1)
  80     {
  81       if (errno == ENOSYS)
  82         FAIL_UNSUPPORTED ("shmget not supported");
  83       FAIL_EXIT1 ("shmget failed (errno=%d)", errno);
  84     }
  85
  86   TEST_COMPARE (shmctl (shmid, first_shm_invalid_cmd (), NULL), -1);
  87   TEST_COMPARE (errno, EINVAL);
  88
  89   /* Get shared memory kernel information and do some sanity checks.  */
  90   struct shmid_ds shminfo;
  91   if (shmctl (shmid, IPC_STAT, &shminfo) == -1)
  92     FAIL_EXIT1 ("shmctl with IPC_STAT failed (errno=%d)", errno);
  93
  94   if (shminfo.shm_perm.__key != key)
  95     FAIL_EXIT1 ("shmid_ds::shm_perm::key (%d) != %d",
  96                 (int) shminfo.shm_perm.__key, (int) key);
  97   if (shminfo.shm_perm.mode != SHM_MODE)
  98     FAIL_EXIT1 ("shmid_ds::shm_perm::mode (%o) != %o",
  99                 shminfo.shm_perm.mode, SHM_MODE);
 100   if (shminfo.shm_segsz != pgsz)
 101     FAIL_EXIT1 ("shmid_ds::shm_segsz (%lu) != %lu",
 102                 (long unsigned) shminfo.shm_segsz, pgsz);
 103
 104   /* Attach on shared memory and realize some operations.  */
 105   int *shmem = shmat (shmid, NULL, 0);
 106   if (shmem == (void*) -1)
 107     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 108
 109   shmem[0]   = 0x55555555;
 110   shmem[32]  = 0x44444444;
 111   shmem[64]  = 0x33333333;
 112   shmem[128] = 0x22222222;
 113
 114   if (shmdt (shmem) == -1)
 115     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 116
 117   shmem = shmat (shmid, NULL, SHM_RDONLY);
 118   if (shmem == (void*) -1)
 119     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 120
 121   CHECK_EQ (shmem[0],   0x55555555);
 122   CHECK_EQ (shmem[32],  0x44444444);
 123   CHECK_EQ (shmem[64],  0x33333333);
 124   CHECK_EQ (shmem[128], 0x22222222);
 125
 126   if (shmdt (shmem) == -1)
 127     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 128
 129   /* Finally free up the semnaphore resource.  */
 130   if (shmctl (shmid, IPC_RMID, 0) == -1)
 131     FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
 132
 133   return 0;
 134 }
 135
 136 #include <support/test-driver.c>