| /* |
| * |
| * 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 |
| */ |
| |
| /* |
| * NAME |
| * write03.c |
| * |
| * DESCRIPTION |
| * Testcase to check that write(2) doesn't corrupt a file when it fails |
| * |
| * ALGORITHM |
| * Create a file for writing, write 100 bytes to it. Then make write(2) |
| * fail with some erroneous parameter, close the fd. Then reopen the |
| * file in RDONLY mode, and read the contents of the file. Compare the |
| * buffers, to see whether they are same. |
| * |
| * USAGE: <for command-line> |
| * write03 [-c n] [-e] [-i n] [-I x] [-P x] [-t] |
| * where, -c n : Run n copies concurrently. |
| * -e : Turn on errno logging. |
| * -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 John George |
| * -Ported |
| * |
| * Restrictions |
| * NONE |
| */ |
| |
| #include <unistd.h> |
| #include <string.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include "test.h" |
| #include <sys/mman.h> |
| |
| char *TCID = "write03"; |
| int TST_TOTAL = 1; |
| |
| char *bad_addr = 0; |
| |
| void setup(void); |
| void cleanup(void); |
| |
| char filename[100]; |
| |
| #if !defined(UCLINUX) |
| |
| int main(int argc, char **argv) |
| { |
| int lc; |
| const char *msg; |
| |
| char wbuf[BUFSIZ], rbuf[BUFSIZ]; |
| int fd; |
| |
| if ((msg = parse_opts(argc, argv, NULL, NULL)) != NULL) { |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| } |
| |
| /* global setup */ |
| setup(); |
| |
| /* The following loop checks looping state if -i option given */ |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| |
| /* reset tst_count in case we are looping */ |
| tst_count = 0; |
| |
| //block1: |
| tst_resm(TINFO, "Enter Block 1: test to check if write " |
| "corrupts the file when write fails"); |
| |
| fd = creat(filename, 0644); |
| if (fd < 0) { |
| tst_resm(TBROK, "creating a new file failed"); |
| cleanup(); |
| } |
| |
| (void)memset(wbuf, '0', 100); |
| |
| if (write(fd, wbuf, 100) == -1) { |
| tst_resm(TFAIL, "failed to write to %s", filename); |
| cleanup(); |
| } |
| |
| if (write(fd, bad_addr, 100) != -1) { |
| tst_resm(TFAIL, "write(2) failed to fail"); |
| cleanup(); |
| } |
| close(fd); |
| |
| if ((fd = open(filename, O_RDONLY)) == -1) { |
| tst_resm(TBROK, "open(2) failed, errno: %d", errno); |
| cleanup(); |
| } |
| |
| if (read(fd, rbuf, 100) == -1) { |
| tst_resm(TBROK, "read(2) failed, errno: %d", errno); |
| cleanup(); |
| } |
| |
| if (memcmp(wbuf, rbuf, 100) == 0) { |
| tst_resm(TPASS, "failure of write(2) didnot corrupt " |
| "the file"); |
| } else { |
| tst_resm(TFAIL, "failure of write(2) corrupted the " |
| "file"); |
| } |
| tst_resm(TINFO, "Exit block 1"); |
| close(fd); |
| } |
| cleanup(); |
| tst_exit(); |
| } |
| |
| #else |
| |
| int main(void) |
| { |
| tst_resm(TINFO, "test is not available on uClinux"); |
| tst_exit(); |
| } |
| |
| #endif /* if !defined(UCLINUX) */ |
| |
| /* |
| * setup() - performs all ONE TIME setup for this test |
| */ |
| void setup(void) |
| { |
| |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| /* Pause if that option was specified |
| * TEST_PAUSE contains the code to fork the test with the -i option. |
| * You want to make sure you do this before you create your temporary |
| * directory. |
| */ |
| TEST_PAUSE; |
| |
| /* Create a unique temporary directory and chdir() to it. */ |
| tst_tmpdir(); |
| |
| sprintf(filename, "./write03.%d", getpid()); |
| |
| bad_addr = mmap(0, 1, PROT_NONE, |
| MAP_PRIVATE_EXCEPT_UCLINUX | MAP_ANONYMOUS, 0, 0); |
| if (bad_addr == MAP_FAILED) { |
| printf("mmap failed\n"); |
| } |
| |
| } |
| |
| /* |
| * cleanup() - performs all ONE TIME cleanup for this test at |
| * completion or premature exit |
| */ |
| void cleanup(void) |
| { |
| |
| unlink(filename); |
| tst_rmdir(); |
| |
| } |