source: tags/syscall-add-simple-foo/minix/lib/other/flock.c@ 15

/* Library routines
 *
 * Porting to Minix 2.0.0
 * Author:      Giovanni Falzoni <gfalzoni@pointest.com>
 *
 * $Id: flock.c,v 1.1 2005/10/31 14:31:05 beng Exp $
 */
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

/*
 *      Name:           int flock(int fd, int mode);
 *      Function:       Implements the flock function in Minix.
 */
int flock(int fd, int mode)
{
  struct flock lck;
  register int retcode;

  memset((void *) &lck, 0, sizeof(struct flock));
  lck.l_type = mode & ~LOCK_NB;
  lck.l_pid = getpid();
  if ((retcode = fcntl(fd, mode & LOCK_NB ? F_SETLK : F_SETLKW, &lck)) < 0 && errno == EAGAIN)
        errno = EWOULDBLOCK;
  return retcode;
}

/** flock.c **/