Attachment 4889 Details for Bug 6828 – Test program to grab lock and not release it.

Test program to grab lock and not release it.

ctdb_test.c (text/plain), 962 bytes, created by Barry Sabsevitz (mail address dead) on 2009-10-26 19:19:20 UTC

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Creator: Barry Sabsevitz (mail address dead)

Created: 2009-10-26 19:19:20 UTC

Size: 962 bytes

patch

obsolete

>#include <stdio.h>
>#include <fcntl.h>
>#include <sys/errno.h>
>
>int fd;
>
>void
>lock_file()
>{
>	struct flock lock;
>	int ret;
>
>	lock.l_whence = SEEK_SET;
>	lock.l_start = 0;
>	lock.l_len = 0;
>	lock.l_type = F_WRLCK;
>
>	printf ("locking file\n");
>	fflush(stdout);
>
>	ret = fcntl(fd, F_SETLKW, &lock);
>	if (ret < 0) {
>		perror ("lock failed:");
>		exit(1);
>	}
>}
>
>void
>unlock_file()
>{
>
>	struct flock lock;
>	int ret;
>
>	lock.l_whence = SEEK_SET;
>	lock.l_start = 0;
>	lock.l_len = 0;
>	lock.l_type = F_UNLCK;
>
>	printf ("unlocking file\n");
>	fflush(stdout);
>
>	ret = fcntl(fd, F_SETLKW, &lock);
>	if (ret < 0) {
>		perror ("unlock lock failed:");
>		exit(1);
>	}
>}
>
>
>main(int argc, char *argv[])
>{
>
>	char buf[1024];
>
>	fd = open(argv[1], O_RDWR);
>	if (fd < 0) {
>		perror ("open failed:");
>		exit(1);
>	}
>
>	while(1) {
>
>		lock_file();
>
>		printf ("File locked\n");
>		fflush(stdout);
>		fgets(buf, sizeof(buf), stdin);
>
>		unlock_file();
>		printf ("File unlocked\n");
>		fflush(stdout);
>	}
>}
>	
>

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