liblock/lockflock.c

   1 /*
   2 ** Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
   3 ** distribution information.
   4 */
   5
   6 /* $Id: lockflock.c,v 1.3 1999/12/06 13:18:55 mrsam Exp $ */
   7 #if     HAVE_CONFIG_H
   8 #include        "config.h"
   9 #endif
  10 #include        <sys/types.h>
  11 #if     HAVE_FCNTL_H
  12 #include        <fcntl.h>
  13 #endif
  14 #if     HAVE_SYS_FCNTL_H
  15 #include        <sys/fcntl.h>
  16 #endif
  17 #if     HAVE_SYS_FILE_H
  18 #include        <sys/file.h>
  19 #endif
  20 #include        <errno.h>
  21 #include        "liblock.h"
  22
  23 int     ll_lockfd(int fd, int ltype, LL_OFFSET_TYPE start, LL_OFFSET_TYPE len)
  24 {
  25         if (start || len
  26                 || (ltype & ll_whence_curpos)
  27                 || (ltype & ll_whence_end))
  28         {
  29                 errno=EINVAL;
  30                 return (-1);
  31         }
  32
  33         return (flock(fd, ltype & ll_unlock ? LOCK_UN:
  34                 (ltype & ll_writelock ? LOCK_EX:LOCK_SH) |
  35                 (ltype & ll_wait ? 0:LOCK_NB)));
  36 }