lib/sys_file.in.h

   1 /* Provide a more complete sys/file.h.
   2
   3    Copyright (C) 2007-2008 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 /* Written by Richard W.M. Jones.  */
  20 #ifndef _GL_SYS_FILE_H
  21
  22 # if __GNUC__ >= 3
  23 @PRAGMA_SYSTEM_HEADER@
  24 # endif
  25
  26 /* The include_next requires a split double-inclusion guard.  */
  27 # if @HAVE_SYS_FILE_H@
  28 #  @INCLUDE_NEXT@ @NEXT_SYS_FILE_H@
  29 # endif
  30
  31 #ifndef _GL_SYS_FILE_H
  32 #define _GL_SYS_FILE_H
  33
  34
  35 #if @GNULIB_FLOCK@
  36 /* Apply or remove advisory locks on an open file.
  37    Return 0 if successful, otherwise -1 and errno set.  */
  38 # if !@HAVE_FLOCK@
  39 extern int flock (int fd, int operation);
  40
  41 /* Operations for the 'flock' call (same as Linux kernel constants).  */
  42 #define LOCK_SH 1       /* Shared lock.  */
  43 #define LOCK_EX 2       /* Exclusive lock.  */
  44 #define LOCK_UN 8       /* Unlock.  */
  45
  46 /* Can be OR'd in to one of the above.  */
  47 #define LOCK_NB 4       /* Don't block when locking.  */
  48
  49 # endif
  50 #elif defined GNULIB_POSIXCHECK
  51 # undef flock
  52 # define flock(fd,op)                          \
  53     (GL_LINK_WARNING ("flock is unportable - " \
  54                       "use gnulib module flock for portability"), \
  55      flock ((fd), (op)))
  56 #endif
  57
  58
  59 #endif /* _GL_SYS_FILE_H */
  60 #endif /* _GL_SYS_FILE_H */