granicus.if.org Git - strace/blob - tests/shmxt.c

   1 #include "tests.h"
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <sys/shm.h>
   5
   6 static int id = -1;
   7
   8 static void
   9 cleanup(void)
  10 {
  11         shmctl(id, IPC_RMID, NULL);
  12         id = -1;
  13 }
  14
  15 #ifdef __alpha__
  16 # define SHMAT "osf_shmat"
  17 #else
  18 # define SHMAT "shmat"
  19 #endif
  20
  21 int
  22 main(void)
  23 {
  24         id = shmget(IPC_PRIVATE, 1, 0600);
  25         if (id < 0)
  26                 perror_msg_and_skip("shmget");
  27         atexit(cleanup);
  28
  29         shmat(id, NULL, SHM_REMAP);
  30         printf("%s(%d, NULL, SHM_REMAP) = -1 %s (%m)\n",
  31                SHMAT, id, errno2name());
  32
  33         void *shmaddr = shmat(id, NULL, SHM_RDONLY);
  34         if (shmaddr == (void *)(-1))
  35                 perror_msg_and_skip("shmat SHM_RDONLY");
  36         printf("%s(%d, NULL, SHM_RDONLY) = %p\n", SHMAT, id, shmaddr);
  37
  38         if (shmdt(shmaddr))
  39                 perror_msg_and_skip("shmdt");
  40         printf("shmdt(%p) = 0\n", shmaddr);
  41
  42         ++shmaddr;
  43         void *shmaddr2 = shmat(id, shmaddr, SHM_RND);
  44         if (shmaddr2 == (void *)(-1))
  45                 printf("%s(%d, %p, SHM_RND) = -1 %s (%m)\n",
  46                        SHMAT, id, shmaddr, errno2name());
  47         else
  48                 printf("%s(%d, %p, SHM_RND) = %p\n",
  49                        SHMAT, id, shmaddr, shmaddr2);
  50
  51         puts("+++ exited with 0 +++");
  52         return 0;
  53 }