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