/*
*
* 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: mremap01
*
* Test Description:
* Verify that, mremap() succeeds when used to expand the existing
* virtual memory mapped region to the requested size where the
* virtual memory area was previously mapped to a file using mmap().
*
* Expected Result:
* mremap() should succeed returning the address of new virtual memory area.
* The expanded mapped memory region should be accessible and able to
* synchronize with the file.
*
* 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)
* Log the errno and Issue a FAIL message.
* Otherwise,
* Verify the Functionality of system call
* if successful,
* Issue Functionality-Pass message.
* Otherwise,
* Issue Functionality-Fail message.
* Cleanup:
* Print errno log and/or timing stats if options given
* Delete the temporary directory created.
*
* Usage: <for command-line>
* mremap01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -f : Turn off functionality Testing.
* -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...
*
* RESTRICTIONS:
* None.
*/
#include <unistd.h>
#include <errno.h>
#define __USE_GNU
#include <sys/mman.h>
#undef __USE_GNU
#include <fcntl.h>
#include "test.h"
#include "safe_macros.h"
#define TEMPFILE "mremapfile"
char *TCID = "mremap01";
int TST_TOTAL = 1;
char *addr; /* addr of memory mapped region */
int memsize; /* memory mapped size */
int newsize; /* new size of virtual memory block */
int fildes; /* file descriptor for tempfile */
void setup(); /* Main setup function of test */
void cleanup(); /* cleanup function for the test */
int main(int ac, char **av)
{
int ind; /* counter variable */
tst_parse_opts(ac, av, NULL, NULL);
tst_count = 0;
setup();
/*
* Call mremap to expand the existing mapped
* memory region (memsize) by newsize limits.
*/
addr = mremap(addr, memsize, newsize, MREMAP_MAYMOVE);
/* Check for the return value of mremap() */
if (addr == MAP_FAILED)
tst_brkm(TFAIL | TERRNO, cleanup, "mremap failed");
/*
* Attempt to initialize the expanded memory
* mapped region with data. If the map area
* was bad, we'd get SIGSEGV.
*/
for (ind = 0; ind < newsize; ind++) {
addr[ind] = (char)ind;
}
/*
* Memory mapped area is good. Now, attempt
* to synchronize the mapped memory region
* with the file.
*/
if (msync(addr, newsize, MS_SYNC) != 0) {
tst_resm(TFAIL | TERRNO, "msync failed to synch "
"mapped file");
} else {
tst_resm(TPASS, "Functionality of "
"mremap() is correct");
}
cleanup();
tst_exit();
}
/*
* void
* setup() - performs all ONE TIME setup for this test.
*
* Get system page size, Set the size of virtual memory area and the
* new size after resize,
* Creat a temporary directory and a file under it.
* Stratch the file size to the size of virtual memory area and
* write 1 byte (\0). Map the temporary file for the length of virtual
* memory (memsize) into memory.
*/
void setup(void)
{
int pagesz; /* system's page size */
tst_sig(NOFORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
/* Get the system page size */
if ((pagesz = getpagesize()) < 0) {
tst_brkm(TFAIL, NULL,
"getpagesize failed to get system page size");
}
/* Get the size of virtual memory area to be mapped */
memsize = (1000 * pagesz);
/* Get the New size of virtual memory block after resize */
newsize = (memsize * 2);
tst_tmpdir();
/* Creat a temporary file used for mapping */
if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0)
tst_brkm(TBROK | TERRNO, cleanup, "opening %s failed",
TEMPFILE);
/* Stretch the file to the size of virtual memory area */
if (lseek(fildes, (off_t) memsize, SEEK_SET) != (off_t) memsize) {
tst_brkm(TBROK | TERRNO, cleanup,
"lseeking to %d offset pos. failed", memsize);
}
/* Write one byte data into temporary file */
if (write(fildes, "\0", 1) != 1) {
tst_brkm(TBROK, cleanup, "writing to %s failed", TEMPFILE);
}
/*
* Call mmap to map virtual memory (memsize bytes) from the
* beginning of temporary file (offset is 0) into memory.
*/
addr = mmap(0, memsize, PROT_WRITE, MAP_SHARED, fildes, 0);
/* Check for the return value of mmap() */
if (addr == (char *)MAP_FAILED) {
tst_brkm(TBROK, cleanup, "mmaping Failed on %s", TEMPFILE);
}
/* Stretch the file to newsize of virtual memory block */
if (lseek(fildes, (off_t) newsize, SEEK_SET) != (off_t) newsize) {
tst_brkm(TBROK, cleanup, "lseek() to %d offset pos. Failed, "
"error=%d : %s", newsize, errno, strerror(errno));
}
/* Write one byte data into temporary file */
if (write(fildes, "\0", 1) != 1) {
tst_brkm(TBROK | TERRNO, cleanup, "writing to %s failed",
TEMPFILE);
}
}
/*
* void
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit.
* Unmap the mapped memory area done in the test.
* Close the temporary file.
* Remove the temporary directory.
*/
void cleanup(void)
{
/* Unmap the mapped memory */
if (munmap(addr, newsize) != 0)
tst_brkm(TBROK | TERRNO, NULL, "munmap failed");
/* Close the temporary file */
SAFE_CLOSE(NULL, fildes);
tst_rmdir();
}