1# open.m4 serial 15
2dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_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.
52AC_DEFUN([gl_PREREQ_OPEN],
53[
54  AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
55  :
56])
57