tests/fcntl_lock.c

ソースコードを見る。

関数
static int	sys_waitpid (pid_t pid, int *status, int options)
int	main (int argc, char *argv[])

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関数

static int sys_waitpid	(	pid_t	pid,
		int *	status,
		int	options
	)			[static]

fcntl_lock.c の 25 行で定義されています。

{
#ifdef HAVE_WAITPID
  return waitpid(pid,status,options);
#else /* USE_WAITPID */
  return wait4(pid, status, options, NULL);
#endif /* USE_WAITPID */
}

int main	(	int	argc,
		char *	argv[]
	)

fcntl_lock.c の 41 行で定義されています。

参照先 errno・fd・fprintf()・status・sys_waitpid().

{
        struct flock lock;
        int fd, ret, status=1;
        pid_t pid;
        char *testdir = NULL;

        testdir = getenv("TESTDIR");
        if (testdir) chdir(testdir);

        alarm(10);

        if (!(pid=fork())) {
                sleep(2);
                fd = open(DATA, O_RDONLY);

                if (fd == -1) {
                        fprintf(stderr,"ERROR: failed to open %s (errno=%d)\n", 
                                DATA, (int)errno);
                        exit(1);
                }

                lock.l_type = F_WRLCK;
                lock.l_whence = SEEK_SET;
                lock.l_start = 0;
                lock.l_len = 4;
                lock.l_pid = getpid();
                
                lock.l_type = F_WRLCK;
                
                /* check if a lock applies */
                ret = fcntl(fd,F_GETLK,&lock);

                if ((ret == -1) ||
                    (lock.l_type == F_UNLCK)) {
                        fprintf(stderr,"ERROR: lock test failed (ret=%d errno=%d)\n", ret, (int)errno);
                        exit(1);
                } else {
                        exit(0);
                }
        }

        unlink(DATA);
        fd = open(DATA, O_RDWR|O_CREAT|O_EXCL, 0600);

        if (fd == -1) {
                fprintf(stderr,"ERROR: failed to open %s (errno=%d)\n", 
                        DATA, (int)errno);
                exit(1);
        }

        lock.l_type = F_WRLCK;
        lock.l_whence = SEEK_SET;
        lock.l_start = 0;
        lock.l_len = 4;
        lock.l_pid = getpid();

        /* set a 4 byte write lock */
        fcntl(fd,F_SETLK,&lock);

        sys_waitpid(pid, &status, 0);

        unlink(DATA);

#if defined(WIFEXITED) && defined(WEXITSTATUS)
    if(WIFEXITED(status)) {
        status = WEXITSTATUS(status);
    } else {
        status = 1;
    }
#else /* defined(WIFEXITED) && defined(WEXITSTATUS) */
        status = (status == 0) ? 0 : 1;
#endif /* defined(WIFEXITED) && defined(WEXITSTATUS) */

        if (status) {
                fprintf(stderr,"ERROR: lock test failed with status=%d\n", 
                        status);
        }

        exit(status);
}

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