/*
*
* 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: munmap02
*
* Test Description:
* Verify that, munmap call will succeed to unmap a mapped file or
* anonymous shared memory region from the calling process's address space
* if the region specified by the address and the length is part or all of
* the mapped region.
*
* Expected Result:
* munmap call should succeed to unmap a part or all of mapped region of a
* file or anonymous shared memory from the process's address space and it
* returns with a value 0,
* further reference to the unmapped region should result in a segmentation
* fault (SIGSEGV).
*
* 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>
* munmap01 [-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
*
* RESTRICTIONS:
* None.
*/
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "test.h"
#include "safe_macros.h"
#define TEMPFILE "mmapfile"
char *TCID = "munmap02";
int TST_TOTAL = 1;
static size_t page_sz;
char *addr; /* addr of memory mapped region */
int fildes; /* file descriptor for tempfile */
unsigned int map_len; /* length of the region to be mapped */
void setup(); /* Main setup function of test */
void cleanup(); /* cleanup function for the test */
void sig_handler(); /* signal catching function */
#ifndef UCLINUX
int main(int ac, char **av)
{
int lc;
tst_parse_opts(ac, av, NULL, NULL);
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
setup();
/*
* Call munmap to unmap the part of the mapped region of the
* temporary file from the address and length that is part of
* the mapped region.
*/
TEST(munmap(addr, map_len));
/* Check for the return value of munmap() */
if (TEST_RETURN == -1) {
tst_resm(TFAIL, "munmap() fails, errno=%d : %s",
TEST_ERRNO, strerror(TEST_ERRNO));
continue;
}
/*
* Check whether further reference is possible
* to the unmapped memory region by writing
* to the first byte of region with
* some arbitrary number.
*/
*addr = 50;
/* This message is printed if no SIGSEGV */
tst_resm(TFAIL, "process succeeds to refer unmapped "
"memory region");
cleanup();
}
tst_exit();
}
#else
int main(void)
{
tst_resm(TINFO, "munmap02 test is not available on uClinux");
tst_exit();
}
#endif /* ifndef UCLINUX */
/*
* setup() - performs all ONE TIME setup for this test.
* Setup signal handler to catch SIGSEGV.
* Get system page size, create a temporary file for reading/writing,
* write one byte data into it, map the open file for the specified
* map length.
*/
void setup(void)
{
tst_sig(NOFORK, DEF_HANDLER, cleanup);
/* call signal function to trap the signal generated */
if (signal(SIGSEGV, sig_handler) == SIG_ERR) {
tst_brkm(TBROK, cleanup, "signal fails to catch signal");
}
TEST_PAUSE;
/* Get the system page size */
page_sz = getpagesize();
/*
* Get the length of the open file to be mapped into process
* address space.
*/
map_len = 3 * page_sz;
tst_tmpdir();
/* Creat a temporary file used for mapping */
if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
tst_brkm(TBROK, cleanup, "open() on %s Failed, errno=%d : %s",
TEMPFILE, errno, strerror(errno));
}
/*
* move the file pointer to maplength position from the beginning
* of the file.
*/
SAFE_LSEEK(cleanup, fildes, map_len, SEEK_SET);
/* Write one byte into temporary file */
if (write(fildes, "a", 1) != 1) {
tst_brkm(TBROK, cleanup, "write() on %s Failed, errno=%d : %s",
TEMPFILE, errno, strerror(errno));
}
/*
* map the open file 'TEMPFILE' from its beginning up to the maplength
* into the calling process's address space at the system choosen
* with read/write permissions to the the mapped region.
*/
#ifdef UCLINUX
/* mmap() doesn't support MAP_SHARED on uClinux */
addr = mmap(0, map_len, PROT_READ | PROT_WRITE,
MAP_FILE | MAP_PRIVATE, fildes, 0);
#else
addr = mmap(0, map_len, PROT_READ | PROT_WRITE,
MAP_FILE | MAP_SHARED, fildes, 0);
#endif
/* check for the return value of mmap system call */
if (addr == (char *)MAP_FAILED) {
tst_brkm(TBROK, cleanup, "mmap() Failed on %s, errno=%d : %s",
TEMPFILE, errno, strerror(errno));
}
/*
* increment the start address of the region at which the file is
* mapped to a maplength of 3 times the system page size by the value
* of system page size and decrement the maplength value by the value
* of system page size.
*/
addr = (char *)((long)addr + page_sz);
map_len = map_len - page_sz;
}
/*
* void
* sig_handler() - signal catching function.
* This function is used to trap the signal generated when tried to read or
* write to the memory mapped region which is already detached from the
* calling process address space.
* this function is invoked when SIGSEGV generated and it calls test
* cleanup function and exit the program.
*/
void sig_handler(void)
{
tst_resm(TPASS, "Functionality of munmap() successful");
/* Invoke test cleanup function and exit */
cleanup();
tst_exit();
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit.
* Unmap the portion of the region of the file left unmapped.
* Close the temporary file.
* Remove the temporary directory.
*/
void cleanup(void)
{
/*
* get the start address and length of the portion of
* the mapped region of the file.
*/
addr = (char *)((long)addr - page_sz);
map_len = map_len - page_sz;
/* unmap the portion of the region of the file left unmapped */
SAFE_MUNMAP(NULL, addr, map_len);
/* Close the temporary file */
SAFE_CLOSE(NULL, fildes);
tst_rmdir();
}