| 1 | # fchdir.m4 serial 20
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| 2 | dnl Copyright (C) 2006-2012 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | AC_DEFUN([gl_FUNC_FCHDIR],
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| 8 | [
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| 9 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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| 10 | AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
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| 11 |
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| 12 | AC_CHECK_DECLS_ONCE([fchdir])
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| 13 | if test $ac_cv_have_decl_fchdir = no; then
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| 14 | HAVE_DECL_FCHDIR=0
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| 15 | fi
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| 16 |
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| 17 | AC_REQUIRE([gl_TEST_FCHDIR])
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| 18 | if test $HAVE_FCHDIR = 0; then
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| 19 | AC_LIBOBJ([fchdir])
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| 20 | gl_PREREQ_FCHDIR
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| 21 | AC_DEFINE([REPLACE_FCHDIR], [1],
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| 22 | [Define to 1 if gnulib's fchdir() replacement is used.])
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| 23 | dnl We must also replace anything that can manipulate a directory fd,
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| 24 | dnl to keep our bookkeeping up-to-date. We don't have to replace
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| 25 | dnl fstatat, since no platform has fstatat but lacks fchdir.
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| 26 | AC_CACHE_CHECK([whether open can visit directories],
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| 27 | [gl_cv_func_open_directory_works],
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| 28 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>
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| 29 | ]], [return open(".", O_RDONLY) < 0;])],
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| 30 | [gl_cv_func_open_directory_works=yes],
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| 31 | [gl_cv_func_open_directory_works=no],
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| 32 | [gl_cv_func_open_directory_works="guessing no"])])
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| 33 | if test "$gl_cv_func_open_directory_works" != yes; then
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| 34 | AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should
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| 35 | work around the inability to open a directory.])
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| 36 | fi
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| 37 | fi
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| 38 | ])
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| 39 |
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| 40 | # Determine whether to use the overrides in lib/fchdir.c.
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| 41 | AC_DEFUN([gl_TEST_FCHDIR],
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| 42 | [
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| 43 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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| 44 | AC_CHECK_FUNCS_ONCE([fchdir])
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| 45 | if test $ac_cv_func_fchdir = no; then
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| 46 | HAVE_FCHDIR=0
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| 47 | fi
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| 48 | ])
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| 49 |
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| 50 | # Prerequisites of lib/fchdir.c.
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| 51 | AC_DEFUN([gl_PREREQ_FCHDIR], [:])
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