250 lines
6.6 KiB
C
250 lines
6.6 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: munmap01
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*
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* Test Description:
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* Verify that, munmap call will succeed to unmap a mapped file or
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* anonymous shared memory region from the calling process's address space
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* and after successful completion of munmap, the unmapped region is no
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* longer accessible.
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*
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* Expected Result:
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* munmap call should succeed to unmap a mapped file or anonymous shared
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* memory region from the process's address space and it returns with a
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* value 0, further reference to the unmapped region should result in a
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* segmentation fault (SIGSEGV).
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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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* Log the errno and Issue a FAIL message.
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* Otherwise,
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* Verify the Functionality of system call
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* if successful,
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* Issue Functionality-Pass message.
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* Otherwise,
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* Issue Functionality-Fail message.
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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 created.
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*
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* Usage: <for command-line>
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* munmap01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
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* where, -c n : Run n copies concurrently.
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* -f : Turn off functionality Testing.
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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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* RESTRICTIONS:
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* None.$
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include "test.h"
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#include "safe_macros.h"
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#define TEMPFILE "mmapfile"
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char *TCID = "munmap01";
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int TST_TOTAL = 1;
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char *addr; /* addr of memory mapped region */
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int fildes; /* file descriptor for tempfile */
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unsigned int map_len; /* length of the region to be mapped */
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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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void sig_handler(); /* signal catching function */
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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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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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setup();
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/*
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* Call munmap to unmap the mapped region of the
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* temporary file from the calling process's address space.
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*/
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TEST(munmap(addr, map_len));
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/* Check for the return value of munmap() */
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if (TEST_RETURN == -1) {
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tst_resm(TFAIL, "munmap() fails, errno=%d : %s",
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TEST_ERRNO, strerror(TEST_ERRNO));
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continue;
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}
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#ifdef UCLINUX
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/*
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* No SIGSEGV on uClinux since
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* MMU not implemented on uClinux
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*/
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tst_resm(TPASS, "call succedded");
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#else
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/*
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* Check whether further reference is possible
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* to the unmapped memory region by writing
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* to the first byte of region with
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* some arbitrary number.
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*/
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*addr = 50;
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/* This message is printed if no SIGSEGV */
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tst_resm(TFAIL, "process succeeds to refer unmapped "
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"memory region");
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#endif
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cleanup();
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}
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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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* Set up signal handler to catch SIGSEGV.
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* Get system page size, create a temporary file for reading/writing,
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* write one byte data into it, map the open file for the specified
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* map length.
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*/
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void setup(void)
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{
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size_t page_sz;
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tst_sig(NOFORK, DEF_HANDLER, cleanup);
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/* call signal function to trap the signal generated */
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if (signal(SIGSEGV, sig_handler) == SIG_ERR) {
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tst_brkm(TBROK, cleanup, "signal fails to catch signal");
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}
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TEST_PAUSE;
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/* Get the system page size */
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page_sz = getpagesize();
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/*
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* Get the length of the open file to be mapped into process
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* address space.
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*/
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map_len = 3 * page_sz;
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tst_tmpdir();
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/* Creat a temporary file used for mapping */
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if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
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tst_brkm(TBROK, cleanup, "open() on %s Failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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}
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/*
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* move the file pointer to maplength position from the beginning
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* of the file.
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*/
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SAFE_LSEEK(cleanup, fildes, map_len, SEEK_SET);
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/* Write one byte into temporary file */
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if (write(fildes, "a", 1) != 1) {
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tst_brkm(TBROK, cleanup, "write() on %s Failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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}
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/*
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* map the open file 'TEMPFILE' from its beginning up to the maplength
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* into the calling process's address space at the system choosen
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* with read/write permissions to the the mapped region.
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*/
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#ifdef UCLINUX
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/* MAP_SHARED is not implemented on uClinux */
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addr = mmap(0, map_len, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_PRIVATE, fildes, 0);
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#else
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addr = mmap(0, map_len, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, fildes, 0);
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#endif
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/* check for the return value of mmap system call */
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if (addr == (char *)MAP_FAILED) {
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tst_brkm(TBROK, cleanup, "mmap() Failed on %s, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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}
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}
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/*
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* sig_handler() - signal catching function.
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* This function is used to trap the signal generated when tried to read or
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* write to the memory mapped region which is already detached from the
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* calling process address space.
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* this function is invoked when SIGSEGV generated and it calls test
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* cleanup function and exit the program.
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*/
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void sig_handler(void)
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{
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tst_resm(TPASS, "Functionality of munmap() successful");
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/* Invoke test cleanup function and exit */
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cleanup();
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tst_exit();
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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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* Close the temporary file.
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* Remove the temporary directory.
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*/
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void cleanup(void)
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{
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/* Close the temporary file */
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if (close(fildes) < 0) {
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tst_brkm(TFAIL, NULL, "close() on %s Failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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}
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tst_rmdir();
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}
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