liblock/lockfcntl.c

   1 /*
   2 ** Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
   3 ** distribution information.
   4 */
   5
   6 /* $Id: lockfcntl.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 #include        "liblock.h"
  18
  19 int     ll_lockfd(int fd, int ltype, LL_OFFSET_TYPE start, LL_OFFSET_TYPE len)
  20 {
  21 #if HAS_FLOCK_T
  22 flock_t ft;
  23 #else
  24 struct flock ft;
  25 #endif
  26
  27         ft.l_type=ltype & ll_unlock ? F_UNLCK:
  28                 ltype & ll_writelock ? F_WRLCK:F_RDLCK;
  29         ft.l_whence=ltype & ll_whence_curpos ? 1:
  30                         ltype & ll_whence_end ? 2:0;
  31         ft.l_start=start;
  32         ft.l_len=len;
  33
  34         return (fcntl(fd, (ltype & ll_unlock) == 0 && (ltype & ll_wait)
  35                         ? F_SETLKW:F_SETLK, &ft));
  36 }