Attachment 148693 Details for Bug 229469 – demo program to trigger lock problems

demo program to trigger lock problems

repeatlock.c (text/x-csrc), 971 bytes, created by Michael Young on 2007-02-23 18:03:25 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Michael Young

Created: 2007-02-23 18:03:25 UTC

Size: 971 bytes

patch

obsolete

>#include <unistd.h>
>#include <fcntl.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <stdio.h>
>#include <errno.h>
>#include <signal.h>
>
>void sighand (int sig) {
>	}
>	
>
>int main() {
>	struct flock dolock, checklock, dounlock;
>	struct sigaction alarmhand;
>	int fd,ret,i;
>
>	dolock.l_type=F_WRLCK;
>	dolock.l_whence=SEEK_SET;
>	dolock.l_start=0;
>	dolock.l_len=0;
>	dolock.l_pid=0;
>
>	dounlock.l_type=F_UNLCK;
>	dounlock.l_whence=SEEK_SET;
>	dounlock.l_start=0;
>	dounlock.l_len=0;
>	dounlock.l_pid=0;
>
>
>	fd=open("lockfile", O_RDWR|O_CREAT, S_IRWXU);
>
>	alarmhand.sa_handler=&sighand;
>
>	ret=-1;
>	sigaction(SIGALRM, &alarmhand, NULL);
>	for (i=0; i<10 && ret==-1; i++) {
>		printf("i=%d\n",i);
>		alarm(5);
>		ret=fcntl(fd, F_SETLKW, &dolock);
>		if ( ret==-1 ) {
>			perror("fcntl");
>			}
>		else {
>			alarm(0);
>			printf ("locked\n");
>			}
>		}
>
>	sleep(30);
>	ret=fcntl(fd, F_SETLK, &dounlock);
>	if ( ret==-1 ) {
>		perror("fcntl");
>		}
>	else {
>		printf ("unlocked\n");
>		}
>
>	close(fd);
>}

Actions: View

Attachments on bug 229469: 148680 | 148692 | 148693 | 148759 | 148974