kc3-lang/gnulib/m4/mknod.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/mknod.m4

• # serial 8
  # See if we need to provide mknod replacement.
  
  dnl Copyright (C) 2009-2023 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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