Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
39 lines
758 B
C
39 lines
758 B
C
/*
|
|
* Test shmat(NULL).
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <sys/ipc.h>
|
|
#include <sys/shm.h>
|
|
|
|
int main(void)
|
|
{
|
|
int shmid;
|
|
char *p;
|
|
int err;
|
|
|
|
/* Create, attach and intialize shared memory. */
|
|
shmid = shmget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
|
|
assert(shmid != -1);
|
|
p = shmat(shmid, NULL, 0);
|
|
assert(p != (void *)-1);
|
|
*p = 42;
|
|
|
|
/* Reattach, check that the value is still there. */
|
|
err = shmdt(p);
|
|
assert(err == 0);
|
|
p = shmat(shmid, NULL, 0);
|
|
assert(p != (void *)-1);
|
|
assert(*p == 42);
|
|
|
|
/* Detach. */
|
|
err = shmdt(p);
|
|
assert(err == 0);
|
|
err = shmctl(shmid, IPC_RMID, NULL);
|
|
assert(err == 0);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|