# -*- Autoconf -*-
# SYNOPSIS
#
# AX_CHECK_CAPSICUM([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
#
# DESCRIPTION
#
# This macro searches for an installed Capsicum header and library,
# and if found:
# - AC_DEFINE([HAVE_CAPSICUM]) is called.
# - AC_DEFINE([HAVE_SYS_CAPSICUM_H]) is called if <sys/capsicum.h>
# is present (otherwise <sys/capability.h> must be used).
# - CAPSICUM_LIB is set to the -l option needed to link Capsicum support,
# and AC_SUBST([CAPSICUM_LIB]) is called.
# - The shell commands in ACTION-IF-FOUND are run. The default
# ACTION-IF-FOUND prepends ${CAPSICUM_LIB} into LIBS. If you don't
# want to modify LIBS and don't need to run any other commands either,
# use a colon as ACTION-IF-FOUND.
#
# If Capsicum support isn't found:
# - The shell commands in ACTION-IF-NOT-FOUND are run. The default
# ACTION-IF-NOT-FOUND calls AC_MSG_WARN to print a warning that
# Capsicum support wasn't found.
#
# You should use autoheader to include a definition for the symbols above
# in a config.h file.
#
# Sample usage in a C/C++ source is as follows:
#
# #ifdef HAVE_CAPSICUM
# # ifdef HAVE_SYS_CAPSICUM_H
# # include <sys/capsicum.h>
# # else
# # include <sys/capability.h>
# # endif
# #endif /* HAVE_CAPSICUM */
#
# LICENSE
#
# Copyright (c) 2014 Google Inc.
# Copyright (c) 2015 Lasse Collin <lasse.collin@tukaani.org>
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without any warranty.
#serial 2
AC_DEFUN([AX_CHECK_CAPSICUM], [
# On FreeBSD >= 11.x and Linux, Capsicum is uses <sys/capsicum.h>.
# If this header is found, it is assumed to be the right one.
capsicum_header_found=no
AC_CHECK_HEADERS([sys/capsicum.h], [capsicum_header_found=yes])
if test "$capsicum_header_found" = no ; then
# On FreeBSD 10.x Capsicum uses <sys/capability.h>. Such a header exists
# on Linux too but it describes POSIX.1e capabilities. Look for the
# declaration of cap_rights_limit to check if <sys/capability.h> is
# a Capsicum header.
AC_CHECK_DECL([cap_rights_limit], [capsicum_header_found=yes], [],
[#include <sys/capability.h>])
fi
capsicum_lib_found=no
CAPSICUM_LIB=
if test "$capsicum_header_found" = yes ; then
AC_LANG_PUSH([C])
# FreeBSD >= 10.x has Capsicum functions in libc.
AC_LINK_IFELSE([AC_LANG_CALL([], [cap_rights_limit])],
[capsicum_lib_found=yes], [])
# Linux has Capsicum functions in libcaprights.
AC_CHECK_LIB([caprights], [cap_rights_limit],
[CAPSICUM_LIB=-lcaprights
capsicum_lib_found=yes], [])
AC_LANG_POP([C])
fi
AC_SUBST([CAPSICUM_LIB])
if test "$capsicum_lib_found" = yes ; then
AC_DEFINE([HAVE_CAPSICUM], [1], [Define to 1 if Capsicum is available.])
m4_default([$1], [LIBS="${CAPSICUM_LIB} $LIBS"])
else
m4_default([$2], [AC_MSG_WARN([Capsicum support not found])])
fi])
