| # 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 |
| ]) |
