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annotate m4/mknod.m4 @ 18070:d460ec17f09f

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author Karl Berry <karl@freefriends.org>
date Tue, 28 Jul 2015 13:57:32 -0700
parents ab58d4870664
children
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1 # serial 5
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2 # See if we need to provide mknod replacement.
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3
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4 dnl Copyright (C) 2009-2015 Free Software Foundation, Inc.
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5 dnl This file is free software; the Free Software Foundation
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6 dnl gives unlimited permission to copy and/or distribute it,
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7 dnl with or without modifications, as long as this notice is preserved.
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8
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9 # Written by Eric Blake.
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10
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11 AC_DEFUN([gl_FUNC_MKNOD],
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12 [
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13 AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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14 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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15 AC_REQUIRE([gl_FUNC_MKFIFO])
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16 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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17 AC_CHECK_FUNCS_ONCE([mknod])
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18 if test $ac_cv_func_mknod = no; then
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19 HAVE_MKNOD=0
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20 else
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21 dnl Detect BSD bug, where mknod requires root privileges to create fifo.
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22 AC_CACHE_CHECK([whether mknod can create fifo without root privileges],
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23 [gl_cv_func_mknod_works],
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24 [AC_RUN_IFELSE(
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25 [AC_LANG_PROGRAM(
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26 [[#include <sys/stat.h>
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27 #include <unistd.h>
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28
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29 /* Copied from root-uid.h. FIXME: Just use root-uid.h. */
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30 #ifdef __TANDEM
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31 # define ROOT_UID 65535
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32 #else
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33 # define ROOT_UID 0
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34 #endif
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35 ]], [[/* Indeterminate for super-user, assume no. Why are you running
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36 configure as root, anyway? */
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37 if (geteuid () == ROOT_UID) return 99;
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38 if (mknod ("conftest.fifo", S_IFIFO | 0600, 0)) return 2;]])],
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39 [gl_cv_func_mknod_works=yes],
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40 [if test $? = 99 && test x"$FORCE_UNSAFE_CONFIGURE" = x; then
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41 AC_MSG_FAILURE([you should not run configure as root ]dnl
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42 [(set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)])
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43 fi
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44 gl_cv_func_mknod_works=no],
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45 [case "$host_os" in
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46 # Guess yes on glibc systems.
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47 *-gnu*) gl_cv_func_mknod_works="guessing yes" ;;
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48 # If we don't know, assume the worst.
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49 *) gl_cv_func_mknod_works="guessing no" ;;
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50 esac
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51 ])
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52 rm -f conftest.fifo])
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53 case "$gl_cv_func_mknod_works" in
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54 *yes) ;;
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55 *)
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56 REPLACE_MKNOD=1
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57 AC_DEFINE([MKNOD_FIFO_BUG], [1], [Define to 1 if mknod cannot create
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58 a fifo without super-user privileges])
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59 ;;
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60 esac
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61 dnl Systems that mishandle trailing slash on mkfifo also goof on mknod.
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62 if test $REPLACE_MKFIFO = 1; then
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63 REPLACE_MKNOD=1
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64 fi
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65 fi
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66 ])