libs/liblock/lockflock.c

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