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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <string.h>
#include <linux/limits.h>
#include "zdtmtst.h"
const char *test_doc = "Check that posix flocks are restored";
const char *test_author = "Qiang Huang <h.huangqiang@huawei.com>";
char *filename;
TEST_OPTION(filename, string, "file name", 1);
char file0[PATH_MAX];
char file1[PATH_MAX];
static int lock_reg(int fd, int cmd, int type, int whence,
off_t offset, off_t len)
{
struct flock lock;
lock.l_type = type; /* F_RDLCK, F_WRLCK, F_UNLCK */
lock.l_whence = whence; /* SEEK_SET, SEEK_CUR, SEEK_END */
lock.l_start = offset; /* byte offset, relative to l_whence */
lock.l_len = len; /* #bytes (0 means to EOF) */
errno = 0;
return fcntl(fd, cmd, &lock);
}
#define set_read_lock(fd, whence, offset, len) \
lock_reg(fd, F_SETLK, F_RDLCK, whence, offset, len)
#define set_write_lock(fd, whence, offset, len) \
lock_reg(fd, F_SETLK, F_WRLCK, whence, offset, len)
static int check_read_lock(int fd, int whence, off_t offset, off_t len)
{
struct flock lock;
int ret;
lock.l_type = F_RDLCK; /* F_RDLCK, F_WRLCK, F_UNLCK */
lock.l_whence = whence; /* SEEK_SET, SEEK_CUR, SEEK_END */
lock.l_start = offset; /* byte offset, relative to l_whence */
lock.l_len = len; /* #bytes (0 means to EOF) */
lock.l_pid = -1;
errno = 0;
ret = fcntl(fd, F_GETLK, &lock);
if (ret == -1) {
pr_perror("F_GETLK failed.");
return -1;
}
if (lock.l_pid == -1) {
/* Share lock should succeed. */
return 0;
}
fail("Read lock check failed.");
return -1;
}
static int check_write_lock(int fd, int whence, off_t offset, off_t len)
{
struct flock lock;
int ret;
pid_t ppid = getppid();
lock.l_type = F_WRLCK; /* F_RDLCK, F_WRLCK, F_UNLCK */
lock.l_whence = whence; /* SEEK_SET, SEEK_CUR, SEEK_END */
lock.l_start = offset; /* byte offset, relative to l_whence */
lock.l_len = len; /* #bytes (0 means to EOF) */
lock.l_pid = -1;
errno = 0;
ret = fcntl(fd, F_GETLK, &lock);
if (ret == -1) {
pr_perror("F_GETLK failed.");
return -1;
}
if (lock.l_pid == -1) {
fail("Write lock check failed.");
return -1;
}
/*
* It only succeed when the file lock's owner is exactly
* the same as the file lock was dumped.
*/
if (lock.l_pid == ppid)
return 0;
fail("Write lock check failed.");
return -1;
}
static int check_file_locks(void)
{
int fd_0, fd_1;
int ret0, ret1;
fd_0 = open(file0, O_RDWR | O_CREAT, 0644);
if (fd_0 < 0) {
pr_perror("Unable to open file %s", file0);
return -1;
}
ret0 = check_read_lock(fd_0, SEEK_SET, 0, 0);
fd_1 = open(file1, O_RDWR | O_CREAT, 0644);
if (fd_1 < 0) {
close(fd_0);
unlink(file0);
pr_perror("Unable to open file %s", file1);
return -1;
}
ret1 = check_write_lock(fd_1, SEEK_SET, 0, 0);
close(fd_0);
close(fd_1);
return ret0 | ret1;
}
int main(int argc, char **argv)
{
int fd_0, fd_1, ret;
pid_t pid;
test_init(argc, argv);
snprintf(file0, sizeof(file0), "%s.0", filename);
snprintf(file1, sizeof(file0), "%s.1", filename);
fd_0 = open(file0, O_RDWR | O_CREAT | O_EXCL, 0666);
if (fd_0 < 0) {
pr_perror("Unable to open file %s", file0);
return -1;
}
fd_1 = open(file1, O_RDWR | O_CREAT | O_EXCL, 0666);
if (fd_1 < 0) {
close(fd_0);
unlink(file0);
pr_perror("Unable to open file %s", file1);
return -1;
}
pid = fork();
if (pid < 0) {
pr_perror("Can't fork");
return -1;
}
if (pid == 0) { /* child will check father's file locks */
test_waitsig();
if (check_file_locks()) {
fail("Posix file lock check failed");
exit(1);
}
pass();
exit(0);
}
ret = set_read_lock(fd_0, SEEK_SET, 0, 0);
if (ret == -1) {
pr_perror("Failed to set read lock");
kill(pid, SIGTERM);
return -1;
}
ret = set_write_lock(fd_1, SEEK_SET, 0, 0);
if (ret == -1) {
pr_perror("Failed to set write lock");
kill(pid, SIGTERM);
return -1;
}
test_daemon();
test_waitsig();
kill(pid, SIGTERM);
waitpid(pid, NULL, 0);
close(fd_0);
close(fd_1);
unlink(file0);
unlink(file1);
return 0;
}
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