157 lines
3.8 KiB
C
157 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) International Business Machines Corp., 2004
|
|
* Copyright (c) Linux Test Project, 2004-2017
|
|
*
|
|
* DESCRIPTION
|
|
* hugeshmdt01 - check that largr shared memory is detached correctly
|
|
*
|
|
* ALGORITHM
|
|
* create a large shared memory resource
|
|
* attach it to the current process and give it a value
|
|
* call shmdt() using the TEST macro
|
|
* check the return code
|
|
* if failure, issue a FAIL message.
|
|
* otherwise,
|
|
* if doing functionality testing
|
|
* attempt to write a value to the large shared memory address
|
|
* this should generate a SIGSEGV which will be caught in
|
|
* the signal handler
|
|
* if correct,
|
|
* issue a PASS message
|
|
* otherwise
|
|
* issue a FAIL message
|
|
* call cleanup
|
|
*
|
|
* HISTORY
|
|
* 03/2001 - Written by Wayne Boyer
|
|
* 04/2004 - Updated by Robbie Williamson
|
|
*/
|
|
|
|
#include <setjmp.h>
|
|
#include <limits.h>
|
|
#include "hugetlb.h"
|
|
|
|
static size_t shm_size;
|
|
static int shm_id_1 = -1;
|
|
struct shmid_ds buf;
|
|
static int *shared;
|
|
static int pass;
|
|
static sigjmp_buf env;
|
|
|
|
static void check_functionality(void);
|
|
static void sighandler(int sig);
|
|
|
|
static void hugeshmdt_test(void)
|
|
{
|
|
struct sigaction sa;
|
|
|
|
sa.sa_handler = sighandler;
|
|
sigaction(SIGSEGV, &sa, NULL);
|
|
|
|
if (shmdt(shared) == -1)
|
|
tst_res(TFAIL | TERRNO, "shmdt");
|
|
else
|
|
check_functionality();
|
|
|
|
/* reattach the shared memory segment in case we are looping */
|
|
shared = shmat(shm_id_1, 0, 0);
|
|
if (shared == (void *)-1)
|
|
tst_brk(TBROK | TERRNO, "shmat #2: reattach");
|
|
|
|
/* also reset pass */
|
|
pass = 0;
|
|
}
|
|
|
|
static void check_functionality(void)
|
|
{
|
|
/* stat the shared memory segment */
|
|
if (shmctl(shm_id_1, IPC_STAT, &buf) == -1)
|
|
tst_brk(TBROK | TERRNO, "shmctl");
|
|
|
|
if (buf.shm_nattch != 0) {
|
|
tst_res(TFAIL, "# of attaches is incorrect");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Try writing to the shared memory. This should generate a
|
|
* SIGSEGV which will be caught below.
|
|
*
|
|
* This is wrapped by the sigsetjmp() call that will take care of
|
|
* restoring the program's context in an elegant way in conjunction
|
|
* with the call to siglongjmp() in the signal handler.
|
|
*
|
|
* An attempt to do the assignment without using the sigsetjmp()
|
|
* and siglongjmp() calls will result in an infinite loop. Program
|
|
* control is returned to the assignment statement after the execution
|
|
* of the signal handler and another SIGSEGV will be generated.
|
|
*/
|
|
|
|
if (sigsetjmp(env, 1) == 0)
|
|
*shared = 2;
|
|
|
|
if (pass)
|
|
tst_res(TPASS, "huge shared memory detached correctly");
|
|
else
|
|
tst_res(TFAIL, "huge shared memory was not detached "
|
|
"correctly");
|
|
}
|
|
|
|
static void sighandler(int sig)
|
|
{
|
|
/* if we have received a SIGSEGV, we are almost done */
|
|
if (sig == SIGSEGV) {
|
|
/* set the global variable and jump back */
|
|
pass = 1;
|
|
siglongjmp(env, 1);
|
|
} else {
|
|
tst_brk(TBROK, "unexpected signal received: %d", sig);
|
|
}
|
|
}
|
|
|
|
void setup(void)
|
|
{
|
|
long hpage_size;
|
|
|
|
if (tst_hugepages == 0)
|
|
tst_brk(TCONF, "No enough hugepages for testing.");
|
|
|
|
hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;
|
|
|
|
shm_size = hpage_size * tst_hugepages / 2;
|
|
update_shm_size(&shm_size);
|
|
shmkey = getipckey();
|
|
|
|
/* create a shared memory resource with read and write permissions */
|
|
shm_id_1 = shmget(shmkey, shm_size,
|
|
SHM_HUGETLB | SHM_RW | IPC_CREAT | IPC_EXCL);
|
|
if (shm_id_1 == -1)
|
|
tst_brk(TBROK | TERRNO, "shmget");
|
|
|
|
/* attach the shared memory segment */
|
|
shared = shmat(shm_id_1, 0, 0);
|
|
if (shared == (void *)-1)
|
|
tst_brk(TBROK | TERRNO, "shmat #1");
|
|
|
|
/* give a value to the shared memory integer */
|
|
*shared = 4;
|
|
}
|
|
|
|
void cleanup(void)
|
|
{
|
|
rm_shm(shm_id_1);
|
|
}
|
|
|
|
static struct tst_test test = {
|
|
.needs_root = 1,
|
|
.options = (struct tst_option[]) {
|
|
{"s:", &nr_opt, "-s num Set the number of the been allocated hugepages"},
|
|
{}
|
|
},
|
|
.setup = setup,
|
|
.cleanup = cleanup,
|
|
.test_all = hugeshmdt_test,
|
|
.request_hugepages = 128,
|
|
};
|