# open-slash.m4 serial 1

dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl Tests whether open() and creat() recognize a trailing slash.

dnl Sets gl_cv_func_open_slash.

AC_DEFUN([gl_OPEN_TRAILING_SLASH_BUG],

[

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  dnl open("foo/") should not create a file when the file name has a

  dnl trailing slash.  FreeBSD only has the problem on symlinks.

  AC_CHECK_FUNCS_ONCE([lstat])

  AC_CACHE_CHECK([whether open recognizes a trailing slash],

    [gl_cv_func_open_slash],

    [# Assume that if we have lstat, we can also check symlinks.

     if test $ac_cv_func_lstat = yes; then

       touch conftest.tmp

       ln -s conftest.tmp conftest.lnk

     fi

     AC_RUN_IFELSE(

       [AC_LANG_SOURCE([[

#include <fcntl.h>

#if HAVE_UNISTD_H

# include <unistd.h>

#endif

int main ()

{

  int result = 0;

#if HAVE_LSTAT

  if (open ("conftest.lnk/", O_RDONLY) != -1)

    result |= 1;

#endif

  if (open ("conftest.sl/", O_CREAT, 0600) >= 0)

    result |= 2;

  return result;

}]])],

       [gl_cv_func_open_slash=yes],

       [gl_cv_func_open_slash=no],

       [

changequote(,)dnl

        case "$host_os" in

          freebsd* | aix* | hpux* | solaris2.[0-9] | solaris2.[0-9].*)

            gl_cv_func_open_slash="guessing no" ;;

          *)

            gl_cv_func_open_slash="guessing yes" ;;

        esac

changequote([,])dnl

       ])

     rm -f conftest.sl conftest.tmp conftest.lnk

    ])

  case "$gl_cv_func_open_slash" in

    *no)

      AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],

        [Define to 1 if open() fails to recognize a trailing slash.])

      ;;

  esac

])