m4/flock.m4

   1 # flock.m4 serial 1
   2 dnl Copyright (C) 2008-2010 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 AC_DEFUN([gl_FUNC_FLOCK],
   8 [
   9   AC_REQUIRE([gl_HEADER_SYS_FILE_H_DEFAULTS])
  10   AC_CHECK_FUNCS_ONCE([flock])
  11   if test $ac_cv_func_flock = no; then
  12     HAVE_FLOCK=0
  13     AC_LIBOBJ([flock])
  14     gl_PREREQ_FLOCK
  15   fi
  16 ])
  17
  18 dnl Prerequisites of lib/flock.c.
  19 AC_DEFUN([gl_PREREQ_FLOCK],
  20 [
  21   AC_CHECK_FUNCS_ONCE([fcntl])
  22   AC_CHECK_HEADERS_ONCE([unistd.h fcntl.h])
  23
  24   dnl Do we have a POSIX fcntl lock implementation?
  25   AC_CHECK_MEMBERS([struct flock.l_type],[],[],[[#include <fcntl.h>]])
  26 ])