| /* |
| * |
| * 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 "usctest.h" |
| |
| #define TEMPFILE "mmapfile" |
| |
| char *TCID = "munmap02"; |
| int TST_TOTAL = 1; |
| |
| size_t page_sz; /* system page size */ |
| 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; |
| const char *msg; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| 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; |
| } |
| /* |
| * Perform functional verification if test |
| * executed without (-f) option. |
| */ |
| if (STD_FUNCTIONAL_TEST) { |
| /* |
| * 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"); |
| } else { |
| tst_resm(TPASS, "call succeeded"); |
| } |
| |
| 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"); |
| tst_exit(); |
| } |
| |
| TEST_PAUSE; |
| |
| /* Get the system page size */ |
| if ((page_sz = getpagesize()) < 0) { |
| tst_brkm(TBROK, cleanup, |
| "getpagesize() fails to get system page size"); |
| tst_exit(); |
| } |
| |
| /* |
| * 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)); |
| tst_exit(); |
| } |
| |
| /* |
| * move the file pointer to maplength position from the beginning |
| * of the file. |
| */ |
| if (lseek(fildes, map_len, SEEK_SET) == -1) { |
| tst_brkm(TBROK, cleanup, "lseek() fails on %s, errno=%d : %s", |
| TEMPFILE, errno, strerror(errno)); |
| tst_exit(); |
| } |
| |
| /* 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)); |
| tst_exit(); |
| } |
| |
| /* |
| * 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)); |
| tst_exit(); |
| } |
| |
| /* |
| * 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) |
| { |
| /* |
| * print timing stats if that option was specified. |
| * print errno log if that option was specified. |
| */ |
| TEST_CLEANUP; |
| |
| /* |
| * 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 */ |
| if (munmap(addr, map_len) < 0) { |
| tst_brkm(TBROK, NULL, |
| "munmap() fails to unmap portion of mapped region"); |
| } |
| |
| /* Close the temporary file */ |
| if (close(fildes) < 0) { |
| tst_brkm(TBROK, NULL, "close() on %s Failed, errno=%d : %s", |
| TEMPFILE, errno, strerror(errno)); |
| } |
| |
| tst_rmdir(); |
| } |