shmxt.c revision 6c69ed7ac54b7a7570227f3691d25e53e8318d19 
1#include "tests.h"
2#include <stdio.h>
3#include <stdlib.h>
4#include <sys/shm.h>
5
6static int id = -1;
7
8static void
9cleanup(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
21int
22main(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}
54