libs/liblock/lockfcntl.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 #include        "liblock.h"
  17
  18 int     ll_lockfd(int fd, int ltype, LL_OFFSET_TYPE start, LL_OFFSET_TYPE len)
  19 {
  20 #if HAS_FLOCK_T
  21 flock_t ft;
  22 #else
  23 struct flock ft;
  24 #endif
  25
  26         ft.l_type=ltype & ll_unlock ? F_UNLCK:
  27                 ltype & ll_writelock ? F_WRLCK:F_RDLCK;
  28         ft.l_whence=ltype & ll_whence_curpos ? 1:
  29                         ltype & ll_whence_end ? 2:0;
  30         ft.l_start=start;
  31         ft.l_len=len;
  32
  33         return (fcntl(fd, (ltype & ll_unlock) == 0 && (ltype & ll_wait)
  34                         ? F_SETLKW:F_SETLK, &ft));
  35 }