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         static const int bogus_shmid = 0xfdb97531;
  25         static const void * const bogus_shmaddr =
  26                 (void *) (unsigned long) 0xdec0ded1dec0ded2ULL;
  27         static const int bogus_shmflg = 0xffffface;
  28
  29         long rc;
  30
  31         id = shmget(IPC_PRIVATE, 1, 0600);
  32         if (id < 0)
  33                 perror_msg_and_skip("shmget");
  34         atexit(cleanup);
  35
  36         rc = (long) shmat(bogus_shmid, bogus_shmaddr, bogus_shmflg);
  37         printf("%s(%d, %p, SHM_REMAP|SHM_RDONLY|SHM_RND|%#x) = %s\n",
  38                SHMAT, bogus_shmid, bogus_shmaddr, bogus_shmflg & ~0x7000,
  39                sprintrc(rc));
  40
  41         shmat(id, NULL, SHM_REMAP);
  42         printf("%s(%d, NULL, SHM_REMAP) = -1 %s (%m)\n",
  43                SHMAT, id, errno2name());
  44
  45         void *shmaddr = shmat(id, NULL, SHM_RDONLY);
  46         if (shmaddr == (void *)(-1))
  47                 perror_msg_and_skip("shmat SHM_RDONLY");
  48         printf("%s(%d, NULL, SHM_RDONLY) = %p\n", SHMAT, id, shmaddr);
  49
  50         rc = shmdt(NULL);
  51         printf("shmdt(NULL) = %s\n", sprintrc(rc));
  52
  53         if (shmdt(shmaddr))
  54                 perror_msg_and_skip("shmdt");
  55         printf("shmdt(%p) = 0\n", shmaddr);
  56
  57         ++shmaddr;
  58         void *shmaddr2 = shmat(id, shmaddr, SHM_RND);
  59         if (shmaddr2 == (void *)(-1))
  60                 printf("%s(%d, %p, SHM_RND) = -1 %s (%m)\n",
  61                        SHMAT, id, shmaddr, errno2name());
  62         else
  63                 printf("%s(%d, %p, SHM_RND) = %p\n",
  64                        SHMAT, id, shmaddr, shmaddr2);
  65
  66         puts("+++ exited with 0 +++");
  67         return 0;
  68 }