2014-10-01 04:07:17 +00:00
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/* $NetBSD: t_lockf.c,v 1.9 2013/10/19 17:45:00 christos Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <atf-c.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/ptrace.h>
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/*
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* lockf1 regression test:
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*
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* Tests:
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* Fork N child processes, each of which gets M random byte range locks
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* on a common file. We ignore all lock errors (practically speaking,
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* this means EDEADLK or ENOLOCK), but we make numerous passes over all
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* the children to make sure that they are still awake. (We do this by
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* verifying that we can ptrace(ATTACH/DETACH) to the children and get
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* their status via waitpid().)
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* When finished, reap all the children.
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*/
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#define nlocks 500 /* number of locks per thread */
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#define nprocs 10 /* number of processes to spawn */
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#define npasses 50 /* number of passes to make over the children */
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#define sleeptime 150000 /* sleep time between locks, usec */
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#define filesize 8192 /* size of file to lock */
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const char *lockfile = "lockf_test";
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static u_int32_t
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random_uint32(void)
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{
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return lrand48();
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}
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static void
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trylocks(int id)
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{
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int i, fd;
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srand48(getpid());
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fd = open (lockfile, O_RDWR, 0);
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if (fd < 0)
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err(1, "%s", lockfile);
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printf("%d: start\n", id);
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for (i = 0; i < nlocks; i++) {
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struct flock fl;
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fl.l_start = random_uint32() % filesize;
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fl.l_len = random_uint32() % filesize;
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switch (random_uint32() % 3) {
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case 0:
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fl.l_type = F_RDLCK;
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break;
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case 1:
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fl.l_type = F_WRLCK;
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break;
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case 2:
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fl.l_type = F_UNLCK;
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break;
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}
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fl.l_whence = SEEK_SET;
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(void)fcntl(fd, F_SETLKW, &fl);
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if (usleep(sleeptime) < 0)
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2015-11-16 04:53:13 +00:00
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#if defined(__FreeBSD__)
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if (errno != EINTR)
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#endif
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2014-10-01 04:07:17 +00:00
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err(1, "usleep");
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}
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printf("%d: done\n", id);
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close (fd);
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}
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ATF_TC(randlock);
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ATF_TC_HEAD(randlock, tc)
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{
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atf_tc_set_md_var(tc, "timeout", "300");
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atf_tc_set_md_var(tc, "descr", "Checks fcntl(2) locking");
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}
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ATF_TC_BODY(randlock, tc)
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{
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int i, j, fd;
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int pipe_fd[2];
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pid_t *pid;
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int status;
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char pipe_in, pipe_out;
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const char pipe_errmsg[] = "child: pipe write failed\n";
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(void)unlink(lockfile);
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fd = open (lockfile, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0666);
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ATF_REQUIRE_MSG(fd >= 0, "open(%s): %s", lockfile, strerror(errno));
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ATF_REQUIRE_MSG(ftruncate(fd, filesize) >= 0,
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"ftruncate(%s): %s", lockfile, strerror(errno));
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ATF_REQUIRE_MSG(pipe(pipe_fd) == 0, "pipe: %s", strerror(errno));
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fsync(fd);
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close(fd);
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pid = malloc(nprocs * sizeof(pid_t));
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for (i = 0; i < nprocs; i++) {
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pipe_out = (char)('A' + i);
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pid[i] = fork();
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switch (pid[i]) {
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case 0:
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if (write(pipe_fd[1], &pipe_out, 1) != 1)
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write(STDERR_FILENO, pipe_errmsg,
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__arraycount(pipe_errmsg) - 1);
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else
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trylocks(i);
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_exit(0);
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break;
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case -1:
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atf_tc_fail("fork %d failed", i);
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break;
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default:
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ATF_REQUIRE_MSG(read(pipe_fd[0], &pipe_in, 1) == 1,
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"parent: read_pipe(%i): %s", i, strerror(errno));
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ATF_REQUIRE_MSG(pipe_in == pipe_out,
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"parent: pipe does not match");
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break;
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}
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}
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for (j = 0; j < npasses; j++) {
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printf("parent: run %i\n", j+1);
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for (i = 0; i < nprocs; i++) {
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ATF_REQUIRE_MSG(ptrace(PT_ATTACH, pid[i], 0, 0) >= 0,
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"ptrace attach %d", pid[i]);
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ATF_REQUIRE_MSG(waitpid(pid[i], &status, WUNTRACED) >= 0,
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"waitpid(ptrace)");
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usleep(sleeptime / 3);
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ATF_REQUIRE_MSG(ptrace(PT_DETACH, pid[i], (caddr_t)1,
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0) >= 0,
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"ptrace detach %d", pid[i]);
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usleep(sleeptime / 3);
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}
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}
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for (i = 0; i < nprocs; i++) {
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printf("reap %d: ", i);
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fflush(stdout);
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kill(pid[i], SIGINT);
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waitpid(pid[i], &status, 0);
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printf(" status %d\n", status);
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}
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atf_tc_pass();
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}
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static int
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dolock(int fd, int op, off_t lk_off, off_t lk_size)
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{
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off_t result;
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int ret;
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result = lseek(fd, lk_off, SEEK_SET);
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if (result == -1) {
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return errno;
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}
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ATF_REQUIRE_MSG(result == lk_off, "lseek to wrong offset");
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ret = lockf(fd, op, lk_size);
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if (ret == -1) {
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return errno;
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}
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return 0;
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}
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ATF_TC(deadlock);
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ATF_TC_HEAD(deadlock, tc)
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{
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atf_tc_set_md_var(tc, "timeout", "30");
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atf_tc_set_md_var(tc, "descr", "Checks fcntl(2) deadlock detection");
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}
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ATF_TC_BODY(deadlock, tc)
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{
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int fd;
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int error;
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int ret;
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pid_t pid;
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(void)unlink(lockfile);
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fd = open (lockfile, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0666);
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ATF_REQUIRE_MSG(fd >= 0, "open(%s): %s", lockfile, strerror(errno));
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ATF_REQUIRE_MSG(ftruncate(fd, filesize) >= 0,
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"ftruncate(%s): %s", lockfile, strerror(errno));
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fsync(fd);
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error = dolock(fd, F_LOCK, 0, 1);
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ATF_REQUIRE_MSG(error == 0, "initial dolock: %s", strerror(errno));
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pid = fork();
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ATF_REQUIRE_MSG(pid != -1, "fork failed: %s", strerror(errno));
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if (pid == 0) {
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error = dolock(fd, F_LOCK, 1, 1);
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ATF_REQUIRE_MSG(error == 0, "child dolock: %s",
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strerror(errno));
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dolock(fd, F_LOCK, 0, 1); /* will block */
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atf_tc_fail("child did not block");
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}
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sleep(1); /* give child time to grab its lock then block */
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error = dolock(fd, F_LOCK, 1, 1);
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ATF_REQUIRE_MSG(error == EDEADLK, "parent did not detect deadlock: %s",
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strerror(errno));
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ret = kill(pid, SIGKILL);
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ATF_REQUIRE_MSG(ret != -1, "failed to kill child: %s", strerror(errno));
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atf_tc_pass();
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, randlock);
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ATF_TP_ADD_TC(tp, deadlock);
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return atf_no_error();
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}
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