| 1 | #serial 14 -*- Autoconf -*-
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| 2 |
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| 3 | dnl Find out how to get the file descriptor associated with an open DIR*.
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| 4 |
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| 5 | # Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software
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| 6 | # Foundation, Inc.
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| 7 | # This file is free software; the Free Software Foundation
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| 8 | # gives unlimited permission to copy and/or distribute it,
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| 9 | # with or without modifications, as long as this notice is preserved.
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| 10 |
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| 11 | dnl From Jim Meyering
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| 12 |
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| 13 | AC_DEFUN([gl_FUNC_DIRFD],
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| 14 | [
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| 15 | dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
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| 16 | AC_REQUIRE([AC_PROG_CPP])
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| 17 | AC_REQUIRE([AC_PROG_EGREP])
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| 18 | AC_CHECK_FUNCS(dirfd)
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| 19 | AC_CHECK_DECLS([dirfd], , ,
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| 20 | [#include <sys/types.h>
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| 21 | #include <dirent.h>])
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| 22 |
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| 23 | AC_CACHE_CHECK([whether dirfd is a macro],
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| 24 | gl_cv_func_dirfd_macro,
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| 25 | [AC_EGREP_CPP([dirent_header_defines_dirfd], [
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| 26 | #include <sys/types.h>
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| 27 | #include <dirent.h>
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| 28 | #ifdef dirfd
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| 29 | dirent_header_defines_dirfd
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| 30 | #endif],
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| 31 | gl_cv_func_dirfd_macro=yes,
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| 32 | gl_cv_func_dirfd_macro=no)])
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| 33 |
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| 34 | # Use the replacement only if we have no function, macro,
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| 35 | # or declaration with that name.
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| 36 | if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd,$gl_cv_func_dirfd_macro \
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| 37 | = no,no,no; then
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| 38 | AC_REPLACE_FUNCS([dirfd])
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| 39 | AC_CACHE_CHECK(
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| 40 | [how to get the file descriptor associated with an open DIR*],
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| 41 | gl_cv_sys_dir_fd_member_name,
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| 42 | [
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| 43 | dirfd_save_CFLAGS=$CFLAGS
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| 44 | for ac_expr in d_fd dd_fd; do
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| 45 |
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| 46 | CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
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| 47 | AC_TRY_COMPILE(
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| 48 | [#include <sys/types.h>
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| 49 | #include <dirent.h>],
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| 50 | [DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
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| 51 | dir_fd_found=yes
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| 52 | )
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| 53 | CFLAGS=$dirfd_save_CFLAGS
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| 54 | test "$dir_fd_found" = yes && break
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| 55 | done
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| 56 | test "$dir_fd_found" = yes || ac_expr=no_such_member
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| 57 |
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| 58 | gl_cv_sys_dir_fd_member_name=$ac_expr
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| 59 | ]
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| 60 | )
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| 61 | if test $gl_cv_sys_dir_fd_member_name != no_such_member; then
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| 62 | AC_DEFINE_UNQUOTED(DIR_FD_MEMBER_NAME,
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| 63 | $gl_cv_sys_dir_fd_member_name,
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| 64 | [the name of the file descriptor member of DIR])
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| 65 | fi
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| 66 | AH_VERBATIM(DIR_TO_FD,
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| 67 | [#ifdef DIR_FD_MEMBER_NAME
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| 68 | # define DIR_TO_FD(Dir_p) ((Dir_p)->DIR_FD_MEMBER_NAME)
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| 69 | #else
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| 70 | # define DIR_TO_FD(Dir_p) -1
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| 71 | #endif
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| 72 | ])
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| 73 | fi
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| 74 | ])
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