diff options
Diffstat (limited to 'm4/mknod.m4')
-rw-r--r-- | m4/mknod.m4 | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/m4/mknod.m4 b/m4/mknod.m4 new file mode 100644 index 00000000..04c55de3 --- /dev/null +++ b/m4/mknod.m4 @@ -0,0 +1,48 @@ +# serial 4 +# See if we need to provide mknod replacement. + +dnl Copyright (C) 2009-2012 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([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> +]], [[/* Indeterminate for super-user, assume no. Why are you running + configure as root, anyway? */ + if (!geteuid ()) 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], + [gl_cv_func_mknod_works="guessing no"]) + rm -f conftest.fifo]) + if test "$gl_cv_func_mknod_works" != yes; then + AC_DEFINE([MKNOD_FIFO_BUG], [1], [Define to 1 if mknod cannot create + a fifo without super-user privileges]) + fi + dnl Systems that mishandle trailing slash on mkfifo also goof on mknod. + if test $REPLACE_MKFIFO = 1 || test "$gl_cv_func_mknod_works" != yes; then + REPLACE_MKNOD=1 + fi + fi +]) |