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# serial 8
# See if we need to provide mknod replacement.
dnl Copyright (C) 2009-2020 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.
# Written by Eric Blake.
AC_DEFUN([gl_FUNC_MKNOD],
[
AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_REQUIRE([gl_FUNC_MKFIFO])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([mknod])
if test $ac_cv_func_mknod = no; then
HAVE_MKNOD=0
else
dnl Detect BSD bug, where mknod requires root privileges to create fifo.
AC_CACHE_CHECK([whether mknod can create fifo without root privileges],
[gl_cv_func_mknod_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/stat.h>
#include <unistd.h>
/* Copied from root-uid.h. FIXME: Just use root-uid.h. */
#ifdef __TANDEM
# define ROOT_UID 65535
#else
# define ROOT_UID 0
#endif
]], [[/* Indeterminate for super-user, assume no. Why are you running
configure as root, anyway? */
if (geteuid () == ROOT_UID) return 99;
if (mknod ("conftest.fifo", S_IFIFO | 0600, 0)) return 2;]])],
[gl_cv_func_mknod_works=yes],
[if test $? = 99 && test x"$FORCE_UNSAFE_CONFIGURE" = x; then
AC_MSG_FAILURE([you should not run configure as root ]dnl
[(set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)])
fi
gl_cv_func_mknod_works=no],
[case "$host_os" in
# Guess yes on Linux systems.
linux-* | linux) gl_cv_func_mknod_works="guessing yes" ;;
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_mknod_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_mknod_works="$gl_cross_guess_normal" ;;
esac
])
rm -f conftest.fifo])
case "$gl_cv_func_mknod_works" in
*yes) ;;
*)
REPLACE_MKNOD=1
AC_DEFINE([MKNOD_FIFO_BUG], [1], [Define to 1 if mknod cannot create
a fifo without super-user privileges])
;;
esac
dnl Systems that mishandle trailing slash on mkfifo also goof on mknod.
if test $REPLACE_MKFIFO = 1; then
REPLACE_MKNOD=1
fi
fi
])
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