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      1 # open.m4 serial 15
      2 dnl Copyright (C) 2007-2022 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   AC_REQUIRE([gl_PREPROC_O_CLOEXEC])
     11   case "$host_os" in
     12     mingw* | pw*)
     13       REPLACE_OPEN=1
     14       ;;
     15     *)
     16       dnl open("foo/") should not create a file when the file name has a
     17       dnl trailing slash.  FreeBSD only has the problem on symlinks.
     18       AC_CHECK_FUNCS_ONCE([lstat])
     19       if test "$gl_cv_macro_O_CLOEXEC" != yes; then
     20         REPLACE_OPEN=1
     21       fi
     22       gl_OPEN_TRAILING_SLASH_BUG
     23       case "$gl_cv_func_open_slash" in
     24         *no)
     25           REPLACE_OPEN=1
     26           ;;
     27       esac
     28       ;;
     29   esac
     30   dnl Replace open() for supporting the gnulib-defined fchdir() function,
     31   dnl to keep fchdir's bookkeeping up-to-date.
     32   m4_ifdef([gl_FUNC_FCHDIR], [
     33     if test $REPLACE_OPEN = 0; then
     34       gl_TEST_FCHDIR
     35       if test $HAVE_FCHDIR = 0; then
     36         REPLACE_OPEN=1
     37       fi
     38     fi
     39   ])
     40   dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.
     41   m4_ifdef([gl_NONBLOCKING_IO], [
     42     if test $REPLACE_OPEN = 0; then
     43       gl_NONBLOCKING_IO
     44       if test $gl_cv_have_open_O_NONBLOCK != yes; then
     45         REPLACE_OPEN=1
     46       fi
     47     fi
     48   ])
     49 ])
     50 
     51 # Prerequisites of lib/open.c.
     52 AC_DEFUN([gl_PREREQ_OPEN],
     53 [
     54   AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
     55   :
     56 ])
     57