util-vserver-0.30

[util-vserver.git] / m4 / ensc_syscallnr.m4

diff --git a/m4/ensc_syscallnr.m4 b/m4/ensc_syscallnr.m4
new file mode 100644 (file)
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--- /dev/null
+++ b/m4/ensc_syscallnr.m4
@@ -0,0 +1,62 @@
+dnl $Id: ensc_syscallnr.m4,v 1.1.2.5 2004/03/09 04:16:21 ensc Exp $
+
+dnl Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+dnl  
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; version 2 of the License.
+dnl  
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl  
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+dnl Usage: ENSC_SYSCALLNR(<syscall>,<default>)
+
+AC_DEFUN([ENSC_SYSCALLNR],
+[
+       AC_REQUIRE([AC_PROG_CPP])
+       AC_REQUIRE([AC_PROG_EGREP])
+       AC_REQUIRE([ENSC_KERNEL_HEADERS])
+
+       AC_CACHE_CHECK([for number of syscall '$1'], [ensc_cv_value_syscall_$1],
+       [
+               AC_LANG_PUSH(C)
+               AC_LANG_CONFTEST([
+#include <asm/unistd.h>
+#ifdef __NR_$1
+ensc_syscall_tmp_nr=__NR_$1;
+ensc_syscall_tmp_src=ENSC_MARK
+#endif
+])
+               ensc_syscall_tmp_nr=
+               ensc_syscall_tmp_src=
+               test "$ensc_syscall_tmp_nr" || \
+                       eval $($CPP $CPPFLAGS -D ENSC_MARK='glibc'                                 conftest.c | $EGREP '^ensc_syscall_tmp_(nr=[[1-9]][[0-9]]*;|src=.*)$')
+               test "$ensc_syscall_tmp_nr" || \
+                       eval $($CPP $CPPFLAGS -D ENSC_MARK='kernel' -I $ensc_cv_path_kernelheaders conftest.c | $EGREP '^ensc_syscall_tmp_(nr=[[1-9]][[0-9]]*;|src=.*)$')
+               test "$ensc_syscall_tmp_nr" || {
+                       ensc_syscall_tmp_nr=$2
+                       ensc_syscall_tmp_src=default
+               }
+
+               if test x"$ensc_syscall_tmp_nr" = x; then
+                       AC_MSG_ERROR(
+[Can not determine value of __NR_$1; please verify your glibc/kernelheaders, and/or set CPPFLAGS='-D__NR_$1=<value>' environment when calling configure.])
+               fi
+               AC_LANG_POP
+
+               ensc_cv_value_syscall_$1="$ensc_syscall_tmp_nr/$ensc_syscall_tmp_src"
+       ])
+
+       ensc_syscall_tmp_nr=${ensc_cv_value_syscall_$1%/*}
+       ensc_syscall_tmp_src=${ensc_cv_value_syscall_$1#*/}
+
+       if test x"$ensc_syscall_tmp_src" != x'glibc'; then
+               AC_DEFINE_UNQUOTED(ENSC_SYSCALL__NR_$1, $ensc_syscall_tmp_nr, [The number of the $1 syscall])
+       fi
+])