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From: anand@amax.npac.syr.edu (Rangachari Anand)
Newsgroups: comp.sys.sun
Subject: Problem with lockf on SunOS 3.5
Keywords: SunOS
Message-ID: <4114@kalliope.rice.edu>
Date: 25 Jun 89 15:18:03 GMT
Sender: usenet@rice.edu
Organization: Sun-Spots
Lines: 39
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 8, Issue 49, message 8 of 11

The following program works perfectly on SunOS 4.0.  When run on 3.5 the
following things happen.

  1. The program hangs. The process can not be killed even with
     kill -9

  2. The daemon lockd dies.

The program is shown below:
#include <stdio.h>
#include <sys/file.h>
#include <unistd.h>

main()
{
  int fd, res;

  fd = open("foo", O_WRONLY | O_CREAT);
  if (fd == -1) { perror("t1"); exit(0); }

  res = lockf(fd, F_LOCK, (long) 1);
  if (res == -1) { perror("t1"); exit(0); }
  printf("Lockf returns %d\n", res);

  res = lockf(fd, F_ULOCK, (long) 1);
  if (res == -1) { perror("t1"); exit(0); }
  printf("Lockf returns %d\n", res);

  res = lockf(fd, F_TEST, (long) 1);
  if (res == -1) { perror("t1"); exit(0); }
  printf("Lockf returns %d\n", res);
}

Does any one know what causes this problem.

                                           R.Anand

Internet:  anand@amax.npac.syr.edu
Bitnet:    ranand@sunrise