From d5f92571083c82347f58a415db828b064e377522 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Fri, 22 Feb 2013 14:26:16 +0100
Subject: [PATCH] tevent: define TEVENT_NUM_SIGNALS based on configure checks

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
---
 lib/tevent/libtevent.m4    | 29 +++++++++++++++++++++++++++++
 lib/tevent/tevent_signal.c |  2 --
 lib/tevent/wscript         | 17 +++++++++++++++++
 3 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/lib/tevent/libtevent.m4 b/lib/tevent/libtevent.m4
index 5c5969b0df5..4d4fd2bd77a 100644
--- a/lib/tevent/libtevent.m4
+++ b/lib/tevent/libtevent.m4
@@ -39,6 +39,35 @@ if test x"$ac_cv_header_sys_epoll_h" = x"yes" -a x"$ac_cv_func_epoll_create" = x
    AC_DEFINE(HAVE_EPOLL, 1, [Whether epoll available])
 fi
 
+tevent_num_signals_includes="$ac_includes_default
+#include <signal.h>
+"
+tevent_num_signals=64
+AC_CHECK_VALUEOF(NSIG, [$tevent_num_signals_includes])
+v=$ac_cv_valueof_NSIG
+test -n "$v" && test "$v" -gt "$tevent_num_signals" && {
+	tevent_num_signals=$v
+}
+AC_CHECK_VALUEOF(_NSIG, [$tevent_num_signals_includes])
+v=$ac_cv_valueof__NSIG
+test -n "$v" && test "$v" -gt "$tevent_num_signals" && {
+	tevent_num_signals=$v
+}
+AC_CHECK_VALUEOF(SIGRTMAX, [$tevent_num_signals_includes])
+v=$ac_cv_valueof_SIGRTMAX
+test -n "$v" && test "$v" -gt "$tevent_num_signals" && {
+	tevent_num_signals=$v
+}
+AC_CHECK_VALUEOF(SIGRTMIN, [$tevent_num_signals_includes])
+v=$ac_cv_valueof_SIGRTMIN
+test -n "$v" && {
+	v=`expr $v + $v`
+}
+test -n "$v" && test "$v" -gt "$tevent_num_signals" && {
+	tevent_num_signals=$v
+}
+AC_DEFINE_UNQUOTED(TEVENT_NUM_SIGNALS, $tevent_num_signals, [Max signal number value])
+
 if test x"$VERSIONSCRIPT" != "x"; then
     EXPORTSFILE=tevent.exports
     AC_SUBST(EXPORTSFILE)
diff --git a/lib/tevent/tevent_signal.c b/lib/tevent/tevent_signal.c
index 9582f6e7acd..b5a56ef03aa 100644
--- a/lib/tevent/tevent_signal.c
+++ b/lib/tevent/tevent_signal.c
@@ -30,8 +30,6 @@
 #include "tevent_internal.h"
 #include "tevent_util.h"
 
-#define TEVENT_NUM_SIGNALS 64
-
 /* maximum number of SA_SIGINFO signals to hold in the queue.
   NB. This *MUST* be a power of 2, in order for the ring buffer
   wrap to work correctly. Thanks to Petr Vandrovec <petr@vandrovec.name>
diff --git a/lib/tevent/wscript b/lib/tevent/wscript
index 684286d8c4e..c62c3de3173 100755
--- a/lib/tevent/wscript
+++ b/lib/tevent/wscript
@@ -44,6 +44,23 @@ def configure(conf):
     if conf.CHECK_FUNCS('epoll_create', headers='sys/epoll.h'):
         conf.DEFINE('HAVE_EPOLL', 1)
 
+    tevent_num_signals = 64
+    v = conf.CHECK_VALUEOF('NSIG', headers='signal.h')
+    if v is not None:
+        tevent_num_signals = max(tevent_num_signals, v)
+    v = conf.CHECK_VALUEOF('_NSIG', headers='signal.h')
+    if v is not None:
+        tevent_num_signals = max(tevent_num_signals, v)
+    v = conf.CHECK_VALUEOF('SIGRTMAX', headers='signal.h')
+    if v is not None:
+        tevent_num_signals = max(tevent_num_signals, v)
+    v = conf.CHECK_VALUEOF('SIGRTMIN', headers='signal.h')
+    if v is not None:
+        tevent_num_signals = max(tevent_num_signals, v*2)
+
+    if not conf.CONFIG_SET('USING_SYSTEM_TEVENT'):
+        conf.DEFINE('TEVENT_NUM_SIGNALS', tevent_num_signals)
+
     conf.env.disable_python = getattr(Options.options, 'disable_python', False)
 
     if not conf.env.disable_python: