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