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Diffstat (limited to 'm4/ax_check_capsicum.m4')
| -rw-r--r-- | m4/ax_check_capsicum.m4 | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/m4/ax_check_capsicum.m4 b/m4/ax_check_capsicum.m4 new file mode 100644 index 0000000..f79dc5c --- /dev/null +++ b/m4/ax_check_capsicum.m4 @@ -0,0 +1,85 @@ +# -*- 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]) |