| /* |
| * Copyright (c) International Business Machines Corp., 2002 |
| * Copyright (c) 2012 Cyril Hrubis <chrubis@suse.cz> |
| * |
| * 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 |
| */ |
| |
| /* |
| * This test verifies that flock cannot unlock a file locked |
| * by another task |
| * |
| * Test Steps: |
| * |
| * Fork a child processes The parent flocks a file with LOCK_EX Child waits |
| * for that to happen, then checks to make sure it is locked. Child then |
| * tries to unlock the file. If the unlock succeeds, the child attempts to |
| * lock the file with LOCK_EX. The test passes if the child is able to lock |
| * the file. |
| */ |
| |
| #include <stdio.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/file.h> |
| #include <sys/wait.h> |
| #include "test.h" |
| #include "usctest.h" |
| |
| #define FILE_NAME "flock03" |
| |
| static void setup(void); |
| static void cleanup(void); |
| static void childfunc(int); |
| |
| #ifdef UCLINUX |
| static int fd_uc; |
| static void childfunc_uc(void) |
| { |
| childfunc(fd_uc); |
| } |
| #endif |
| |
| char *TCID = "flock03"; |
| int TST_TOTAL = 3; |
| |
| static struct tst_checkpoint checkpoint; |
| |
| int main(int argc, char **argv) |
| { |
| int lc; |
| char *msg; |
| pid_t pid; |
| int status; |
| int fd; |
| |
| if ((msg = parse_opts(argc, argv, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| #ifdef UCLINUX |
| maybe_run_child(&childfunc_uc, "ds", &fd_uc, FILE_NAME); |
| #endif |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| Tst_count = 0; |
| |
| fd = open(FILE_NAME, O_RDWR); |
| |
| if (fd == -1) |
| tst_brkm(TFAIL, cleanup, "parent failed to open the" |
| "file, errno %d", errno); |
| |
| pid = FORK_OR_VFORK(); |
| |
| if (pid == -1) |
| tst_brkm(TFAIL, cleanup, "fork() failed, errno %d", |
| errno); |
| if (pid == 0) { |
| #ifdef UCLINUX |
| if (self_exec(argv[0], "ds", fd, FILENAME) < 0) |
| tst_brkm(TFAIL, cleanup, "self_exec failed, " |
| "errno &d", errno); |
| #else |
| childfunc(fd); |
| #endif |
| } |
| |
| TEST(flock(fd, LOCK_EX | LOCK_NB)); |
| |
| if (TEST_RETURN != 0) |
| tst_resm(TFAIL, |
| "Parent: Initial attempt to flock() failed, " |
| "errno %d", TEST_ERRNO); |
| else |
| tst_resm(TPASS, |
| "Parent: Initial attempt to flock() passed"); |
| |
| TST_CHECKPOINT_SIGNAL_CHILD(cleanup, &checkpoint); |
| |
| if ((waitpid(pid, &status, 0)) < 0) { |
| tst_resm(TFAIL, "wait() failed"); |
| continue; |
| } |
| if ((WIFEXITED(status)) && (WEXITSTATUS(status) == 0)) |
| tst_resm(TPASS, "flock03 Passed"); |
| else |
| tst_resm(TFAIL, "flock03 Failed"); |
| |
| close(fd); |
| |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| static void childfunc(int fd) |
| { |
| int fd2; |
| |
| TST_CHECKPOINT_CHILD_WAIT(&checkpoint); |
| |
| fd2 = open(FILE_NAME, O_RDWR); |
| |
| if (fd2 == -1) { |
| fprintf(stderr, "CHILD: failed to open the file: %s\n", |
| strerror(errno)); |
| exit(1); |
| } |
| |
| if (flock(fd2, LOCK_EX | LOCK_NB) != -1) { |
| fprintf(stderr, "CHILD: The file was not already locked\n"); |
| exit(1); |
| } |
| |
| TEST(flock(fd, LOCK_UN)); |
| /* XXX: LOCK_UN does not return an error if there was nothing to |
| * unlock. |
| */ |
| if (TEST_RETURN == -1) { |
| fprintf(stderr, "CHILD: Unable to unlock file locked by " |
| "parent: %s\n", strerror(TEST_ERRNO)); |
| exit(1); |
| } else { |
| fprintf(stderr, "CHILD: File locked by parent unlocked\n"); |
| } |
| |
| TEST(flock(fd2, LOCK_EX | LOCK_NB)); |
| |
| if (TEST_RETURN == -1) { |
| fprintf(stderr, "CHILD: Unable to lock file after " |
| "unlocking: %s\n", strerror(TEST_ERRNO)); |
| exit(1); |
| } else { |
| fprintf(stderr, "CHILD: Locking after unlock passed\n"); |
| } |
| |
| close(fd); |
| close(fd2); |
| |
| exit(0); |
| } |
| |
| static void setup(void) |
| { |
| int fd; |
| |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| TEST_PAUSE; |
| |
| tst_tmpdir(); |
| |
| TST_CHECKPOINT_INIT(&checkpoint); |
| |
| fd = creat(FILE_NAME, 0666); |
| if (fd < 0) { |
| tst_resm(TBROK, "creating a new file failed"); |
| TEST_CLEANUP; |
| cleanup(); |
| } |
| close(fd); |
| } |
| |
| static void cleanup(void) |
| { |
| TEST_CLEANUP; |
| |
| tst_rmdir(); |
| } |