# open.m4 serial 15

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.

AC_DEFUN([gl_FUNC_OPEN],

[

  AC_REQUIRE([AC_CANONICAL_HOST])

  AC_REQUIRE([gl_PREPROC_O_CLOEXEC])

  case "$host_os" in

    mingw* | pw*)

      REPLACE_OPEN=1

      ;;

    *)

      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])

      if test "$gl_cv_macro_O_CLOEXEC" != yes; then

        REPLACE_OPEN=1

      fi

      gl_OPEN_TRAILING_SLASH_BUG

      case "$gl_cv_func_open_slash" in

        *no)

          REPLACE_OPEN=1

          ;;

      esac

      ;;

  esac

  dnl Replace open() for supporting the gnulib-defined fchdir() function,

  dnl to keep fchdir's bookkeeping up-to-date.

  m4_ifdef([gl_FUNC_FCHDIR], [

    if test $REPLACE_OPEN = 0; then

      gl_TEST_FCHDIR

      if test $HAVE_FCHDIR = 0; then

        REPLACE_OPEN=1

      fi

    fi

  ])

  dnl Replace open() for supporting the gnulib-defined O_NONBLOCK flag.

  m4_ifdef([gl_NONBLOCKING_IO], [

    if test $REPLACE_OPEN = 0; then

      gl_NONBLOCKING_IO

      if test $gl_cv_have_open_O_NONBLOCK != yes; then

        REPLACE_OPEN=1

      fi

    fi

  ])

])

# Prerequisites of lib/open.c.

AC_DEFUN([gl_PREREQ_OPEN],

[

  AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])

  :

])