144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/*
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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 Description:
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* Call mmap() to map a file creating a mapped region with read access
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* under the following conditions -
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* - The prot parameter is set to PROT_READ
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* - The file descriptor is open for writing.
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*
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* The call should fail to map the file.
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*
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* Expected Result:
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* mmap() should fail returning -1 and errno should get set to EACCES.
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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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 <string.h>
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#include <signal.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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#define TEMPFILE "mmapfile"
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char *TCID = "mmap06";
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int TST_TOTAL = 1;
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static size_t page_sz;
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static char *addr;
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static int fildes;
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static void setup(void);
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static void cleanup(void);
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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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* Call mmap to map the temporary file 'TEMPFILE'
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* with read access.
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*/
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errno = 0;
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addr = mmap(0, page_sz, PROT_READ,
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MAP_FILE | MAP_SHARED, fildes, 0);
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TEST_ERRNO = errno;
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/* Check for the return value of mmap() */
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if (addr != MAP_FAILED) {
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tst_resm(TFAIL | TERRNO,
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"mmap() returned invalid value, expected: %p",
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MAP_FAILED);
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/* Unmap the mapped memory */
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if (munmap(addr, page_sz) != 0) {
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tst_resm(TBROK, "munmap() failed");
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cleanup();
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}
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continue;
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}
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if (TEST_ERRNO == EACCES) {
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tst_resm(TPASS, "mmap failed with EACCES");
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} else {
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tst_resm(TFAIL | TERRNO,
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"mmap failed with unexpected 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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static void setup(void)
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{
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char *tst_buff;
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tst_sig(NOFORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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page_sz = getpagesize();
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/* Allocate space for the test buffer */
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if ((tst_buff = calloc(page_sz, sizeof(char))) == NULL) {
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tst_brkm(TFAIL, NULL, "calloc() failed (tst_buff)");
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}
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/* Fill the test buffer with the known data */
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memset(tst_buff, 'A', 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_WRONLY | O_CREAT, 0666)) < 0) {
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free(tst_buff);
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tst_brkm(TFAIL, cleanup, "opening %s failed", TEMPFILE);
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}
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/* Write test buffer contents into temporary file */
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if (write(fildes, tst_buff, page_sz) < (ssize_t)page_sz) {
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free(tst_buff);
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tst_brkm(TFAIL, cleanup, "writing to %s failed", TEMPFILE);
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}
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free(tst_buff);
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}
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static void cleanup(void)
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{
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close(fildes);
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tst_rmdir();
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}
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