/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Test Name: mremap04
*
* Test Description:
* Verify that,
* mremap() fails when used to expand the existing virtual memory mapped
* region to the requested size, if the memory area cannot be expanded at
* the current virtual address and MREMAP_MAYMOVE flag not set.
*
* Expected Result:
* mremap() should return -1 and set errno to ENOMEM.
*
* Algorithm:
* Setup:
* Setup signal handling.
* Create temporary directory.
* Pause for SIGUSR1 if option specified.
*
* Test:
* Loop if the proper options are given.
* Execute system call
* Check return code, if system call failed (return=-1)
* if errno set == expected errno
* Issue sys call failed with expected return value and errno.
* Otherwise,
* Issue sys call failed with unexpected errno.
* Otherwise,
* Issue sys call returns unexpected value.
*
* Cleanup:
* Print errno log and/or timing stats if options given
* Delete the temporary directory(s)/file(s) created.
*
* Usage: <for command-line>
* mremap04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -e : Turn on errno logging.
* -i n : Execute test n times.
* -I x : Execute test for x seconds.
* -p x : Pause for x seconds between iterations.
* -t : Turn on syscall timing.
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* 11/09/2001 Manoj Iyer (manjo@austin.ibm.com)
* Modified.
* - #include <linux/mman.h> should not be included as per man page for
* mremap, #include <sys/mman.h> alone should do the job. But inorder
* to include definition of MREMAP_MAYMOVE defined in bits/mman.h
* (included by sys/mman.h) __USE_GNU needs to be defined.
* There may be a more elegant way of doing this...
*
* 26/02/2008 Renaud Lottiaux (Renaud.Lottiaux@kerlabs.com)
* - Fix concurrency issue. Use a shm key from getipckey instead of
* a fixed hard-coded value.
*
* RESTRICTIONS:
* None.
*/
#include <errno.h>
#include <unistd.h>
#define __USE_GNU
#include <sys/mman.h>
#undef __USE_GNU
#include <sys/ipc.h>
#include <sys/shm.h>
#include "test.h"
#define SHM_MODE (SHM_R | SHM_W) /* mode permissions of shared memory */
char *TCID = "mremap04";
int TST_TOTAL = 1;
char *addr; /* addr of memory mapped region */
char *shmaddr; /* pointer to shared memory segment */
int shmid; /* shared memory identifier. */
int memsize; /* memory mapped size */
int newsize; /* new size of virtual memory block */
void setup(); /* Main setup function of test */
void cleanup(); /* cleanup function for the test */
extern int getipckey();
int main(int ac, char **av)
{
int lc;
tst_parse_opts(ac, av, NULL, NULL);
setup();
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
/*
* Attempt to expand the existing shared
* memory region of newsize by newsize limits
* using mremap() should fail as specified
* memory area already locked and MREMAP_MAYMOVE
* flag unset.
*/
errno = 0;
addr = mremap(shmaddr, memsize, newsize, 0);
TEST_ERRNO = errno;
/* Check for the return value of mremap() */
if (addr != MAP_FAILED) {
tst_resm(TFAIL,
"mremap returned invalid value, expected: -1");
/* Unmap the mapped memory region */
if (munmap(addr, newsize) != 0) {
tst_brkm(TFAIL, cleanup, "munmap failed to "
"unmap the expanded memory region, "
"error=%d", errno);
}
continue;
}
if (TEST_ERRNO == ENOMEM) {
tst_resm(TPASS, "mremap() failed, "
"'MREMAP_MAYMOVE flag unset', "
"errno %d", TEST_ERRNO);
} else {
tst_resm(TFAIL, "mremap() failed, "
"Unexpected errno %d", TEST_ERRNO);
}
}
cleanup();
tst_exit();
}
/*
* setup() - performs all ONE TIME setup for this test.
*
* Get system page size, Set the size of virtual memory area and the
* newsize after resize,
* Create a named shared memory segment SHMKEY of newsize and mode SHM_MODE
* by using shmget() which returns a shared memory identifier associated
* with the created shared memory segment.
* Call shmat() to attach the shared memory segment to the data segment of the
* calling process. The segment is attached at the first available address as
* selected by the system.
*/
void setup(void)
{
key_t shmkey;
tst_sig(FORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
tst_tmpdir();
/* Get the system page size */
if ((memsize = getpagesize()) < 0) {
tst_brkm(TBROK, NULL,
"getpagesize() failed to get system page size");
}
/* Get the New size of virtual memory block after resize */
newsize = (memsize * 2);
/* get an IPC resource key */
shmkey = getipckey();
/*
* Create a shared memory segment represented by SHMKEY of
* specified size 'newsize' and mode permissions 'SHM_MODE'.
*/
shmid = shmget(shmkey, newsize, IPC_CREAT | SHM_MODE);
if (shmid == -1) {
tst_brkm(TBROK, NULL, "shmget() Failed to create a shared "
"memory, error:%d", errno);
}
/*
* Attach the shared memory segment associated with the shared
* memory identifier specified by "shmid" to the data segment of
* the calling process at the first available address as selected
* by the system.
*/
shmaddr = shmat(shmid, NULL, 0);
if (shmaddr == (void *)-1) {
tst_brkm(TBROK, cleanup, "shmat() Failed to attach shared "
"memory, error:%d", errno);
}
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit.
* Detach the shared memory segment and remove the shared memory
* identifier associated with the shared memory.
*/
void cleanup(void)
{
/*
* Detach the shared memory segment attached to
* the calling process's data segment
*/
if (shmdt(shmaddr) < 0) {
tst_brkm(TFAIL, NULL, "shmdt() Failed to detach shared "
"memory, error:%d", errno);
}
/*
* Remove the shared memory identifier associated with
* the shared memory segment and destroy the shared memory
* segment.
*/
if (shmctl(shmid, IPC_RMID, 0) < 0) {
tst_brkm(TFAIL, NULL, "shmctl() Failed to remove shared "
"memory, error:%d", errno);
}
tst_rmdir();
/* Exit the program */
}