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      1 # open.m4 serial 14
      2 dnl Copyright (C) 2007-2012 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_OPEN],
      8 [
      9   AC_REQUIRE([AC_CANONICAL_HOST])
     10   case "$host_os" in
     11     mingw* | pw*)
     12       REPLACE_OPEN=1
     13       ;;
     14     *)
     15       dnl open("foo/") should not create a file when the file name has a
     16       dnl trailing slash.  FreeBSD only has the problem on symlinks.
     17       AC_CHECK_FUNCS_ONCE([lstat])
     18       AC_CACHE_CHECK([whether open recognizes a trailing slash],
     19         [gl_cv_func_open_slash],
     20         [# Assume that if we have lstat, we can also check symlinks.
     21           if test $ac_cv_func_lstat = yes; then
     22             touch conftest.tmp
     23             ln -s conftest.tmp conftest.lnk
     24           fi
     25           AC_RUN_IFELSE(
     26             [AC_LANG_SOURCE([[
     27 #include <fcntl.h>
     28 #if HAVE_UNISTD_H
     29 # include <unistd.h>
     30 #endif
     31 int main ()
     32 {
     33   int result = 0;
     34 #if HAVE_LSTAT
     35   if (open ("conftest.lnk/", O_RDONLY) != -1)
     36     result |= 1;
     37 #endif
     38   if (open ("conftest.sl/", O_CREAT, 0600) >= 0)
     39     result |= 2;
     40   return result;
     41 }]])],
     42             [gl_cv_func_open_slash=yes],
     43             [gl_cv_func_open_slash=no],
     44             [
     45 changequote(,)dnl
     46              case "$host_os" in
     47                freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)
     48                  gl_cv_func_open_slash="guessing no" ;;
     49                *)
     50                  gl_cv_func_open_slash="guessing yes" ;;
     51              esac
     52 changequote([,])dnl
     53             ])
     54           rm -f conftest.sl conftest.tmp conftest.lnk
     55         ])
     56       case "$gl_cv_func_open_slash" in
     57         *no)
     58           AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
     59             [Define to 1 if open() fails to recognize a trailing slash.])
     60           REPLACE_OPEN=1
     61           ;;
     62       esac
     63       ;;
     64   esac
     65   dnl Replace open() for supporting the gnulib-defined fchdir() function,
     66   dnl to keep fchdir's bookkeeping up-to-date.
     67   m4_ifdef([gl_FUNC_FCHDIR], [
     68     if test $REPLACE_OPEN = 0; then
     69       gl_TEST_FCHDIR
     70       if test $HAVE_FCHDIR = 0; then
     71         REPLACE_OPEN=1
     72       fi
     73     fi
     74   ])
     75   dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
     76   m4_ifdef([gl_NONBLOCKING_IO], [
     77     if test $REPLACE_OPEN = 0; then
     78       gl_NONBLOCKING_IO
     79       if test $gl_cv_have_open_O_NONBLOCK != yes; then
     80         REPLACE_OPEN=1
     81       fi
     82     fi
     83   ])
     84 ])
     85 
     86 # Prerequisites of lib/open.c.
     87 AC_DEFUN([gl_PREREQ_OPEN],
     88 [
     89   AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
     90   :
     91 ])
     92