82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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*/
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/*\
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* [Description]
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*
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* This case check whether we get SIGSEGV when write a value to a detached
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* shared memory resource.
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*/
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <setjmp.h>
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#include "tst_test.h"
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#include "libnewipc.h"
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#include "tst_safe_sysv_ipc.h"
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static int shm_id = -1, shm_key, pass;
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static int *shared;
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static sigjmp_buf env;
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static void sighandler(int sig LTP_ATTRIBUTE_UNUSED)
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{
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pass = 1;
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siglongjmp(env, 1);
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}
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static void check_functionality(void)
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{
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struct shmid_ds buf;
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SAFE_SHMCTL(shm_id, IPC_STAT, &buf);
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TST_EXP_EQ_LI(buf.shm_nattch, 0);
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if (buf.shm_nattch)
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return;
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if (sigsetjmp(env, 1) == 0)
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*shared = 2;
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if (pass)
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tst_res(TPASS, "shared memory detached correctly");
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else
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tst_res(TFAIL, "shared memory was not detached correctly");
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}
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static void verify_shmdt(void)
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{
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TST_EXP_PASS_SILENT(shmdt(shared));
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if (TST_PASS) {
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check_functionality();
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shared = SAFE_SHMAT(shm_id, 0, 0);
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}
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pass = 0;
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}
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static void setup(void)
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{
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shm_key = GETIPCKEY();
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shm_id = SAFE_SHMGET(shm_key, INT_SIZE, SHM_RW | IPC_CREAT | IPC_EXCL);
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SAFE_SIGNAL(SIGSEGV, sighandler);
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shared = SAFE_SHMAT(shm_id, 0, 0);
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}
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static void cleanup(void)
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{
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if (shm_id != -1)
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SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.needs_root = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_shmdt,
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};
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