Attachment 3829 Details for Bug 5993 – Test case provided by our user

Test case provided by our user

testlocking.c (text/x-csrc), 1.00 KB, created by Debian samba package maintainers (PUBLIC MAILING LIST) on 2008-12-25 11:26:46 UTC

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Creator: Debian samba package maintainers (PUBLIC MAILING LIST)

Created: 2008-12-25 11:26:46 UTC

Size: 1.00 KB

patch

obsolete

>/* grep open(2) for O_LARGEFILE to explain this: */
>#define _FILE_OFFSET_BITS 64
>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <unistd.h>
>#include <fcntl.h>
>#include <stdio.h>
>
>/* 
>   Author: Daniel Kahn Gillmor <dkg-debian.org@fifthhorseman.net>
>   Date: 2008-05-28
>
>   This is a demonstration program for testing
>   http://bugs.debian.org/483216
> */
>
>int main(int argc, char* argv[]) {
>  struct flock flock;
>  int fd;
>
>  flock.l_whence=SEEK_SET;
>
>  /* open file, get file descriptor */
>  fd = open(argv[1], O_RDWR|O_CREAT, 0644);
>
>  fcntl(fd, F_SETFD, FD_CLOEXEC | fcntl(fd, F_GETFD));
>
>  /* get read lock: */
>  flock.l_type=F_RDLCK;
>  flock.l_start=0;
>  flock.l_len = 1;
>  if (0 != fcntl(fd, F_SETLK64, &flock)) {
>    perror("read lock failed");
>    return 1;
>  }
>
>  /* get write lock for same range: */
>  flock.l_type=F_WRLCK;
>  if (0 != fcntl(fd, F_SETLK64, &flock)) {
>    /* fails here when used on CIFS share mounted without nobrl option */
>    perror("write lock failed");
>    return 1;
>  }
>    
>  return 0;
>}

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