3 dnl Copyright (C) 2009-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 # See if we need to provide mknod replacement.
10 # Written by Eric Blake.
12 AC_DEFUN([gl_FUNC_MKNOD],
14 AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
15 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
16 AC_REQUIRE([gl_FUNC_MKFIFO])
17 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
18 AC_CHECK_FUNCS_ONCE([mknod])
19 if test $ac_cv_func_mknod = no; then
22 dnl Detect BSD bug, where mknod requires root privileges to create fifo.
23 AC_CACHE_CHECK([whether mknod can create fifo without root privileges],
24 [gl_cv_func_mknod_works],
27 [[#include <sys/stat.h>
30 /* Copied from root-uid.h. FIXME: Just use root-uid.h. */
32 # define ROOT_UID 65535
36 ]], [[/* Indeterminate for super-user, assume no. Why are you running
37 configure as root, anyway? */
38 if (geteuid () == ROOT_UID) return 99;
39 if (mknod ("conftest.fifo", S_IFIFO | 0600, 0)) return 2;]])],
40 [gl_cv_func_mknod_works=yes],
41 [if test $? = 99 && test x"$FORCE_UNSAFE_CONFIGURE" = x; then
42 AC_MSG_FAILURE([you should not run configure as root ]dnl
43 [(set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)])
45 gl_cv_func_mknod_works=no],
47 # Guess yes on Linux systems.
48 linux-* | linux) gl_cv_func_mknod_works="guessing yes" ;;
49 # Guess yes on glibc systems.
50 *-gnu* | gnu*) gl_cv_func_mknod_works="guessing yes" ;;
51 # If we don't know, obey --enable-cross-guesses.
52 *) gl_cv_func_mknod_works="$gl_cross_guess_normal" ;;
56 case "$gl_cv_func_mknod_works" in
60 AC_DEFINE([MKNOD_FIFO_BUG], [1], [Define to 1 if mknod cannot create
61 a fifo without super-user privileges])
64 dnl Systems that mishandle trailing slash on mkfifo also goof on mknod.
65 if test $REPLACE_MKFIFO = 1; then