added check for reliable signal handlers

SConstruct

@@ -52,6 +52,7 @@ from locktype import checkForLockingType
 from lamerpack import checkForLamerpack
 from debugmode import checkForDebugBuild
 from timeout import checkForClientTimeout
+from relsignals import checkReliableSignals
 
 conf = Configure(env,{'checkForCCOption':checkForCCOption,
                       'MAINTAINER_MODE':checkForMaintainerMode,
@@ -61,7 +62,8 @@ conf = Configure(env,{'checkForCCOption':checkForCCOption,
 		      'checkForLockingType':checkForLockingType,
 		      'checkForLamerPack':checkForLamerpack,
 		      'checkForDebugBuild':checkForDebugBuild,
-		      'checkForClientTimeout':checkForClientTimeout
+		      'checkForClientTimeout':checkForClientTimeout,
+		      'checkReliableSignals':checkReliableSignals
 		      })
 # check for CC options
 for option in Split("""
@@ -118,6 +120,8 @@ if not conf.CheckType("union semun", "#include <sys/types.h>\n#include <sys/ipc.
        conf.env.Append(CPPFLAGS = "-D_SEM_SEMUN_UNDEFINED=1")
 
 conf.checkForLockingType(conf)
+if conf.checkReliableSignals():
+    conf.env.Append(CPPFLAGS = '-DRELIABLE_SIGNALS')
 conf.checkForLockPrefix()
 PREFIX=conf.checkPrefix(PREFIX)
 conf.env.Append(CPPFLAGS = '-DSYSCONFDIR=\\"'+PREFIX+'/etc\\"')

site_scons/relsignals.py

@@ -0,0 +1,40 @@
+#
+# SCons Reliable signals test
+#
+# Version 1.0
+# 24-Aug-2009
+#
+
+def checkReliableSignals(conf):
+    """Returns true if signal handlers reinstalls themself"""
+    conf.Message("Checking for reliable signals... ")
+    rc,result = conf.TryRun('''
+#include <stdio.h>    
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>    
+volatile int test;
+void sig_handler(int sg)
+{ 
+    test=1;
+}
+int main()
+{
+    signal(SIGUSR1,sig_handler);
+    test=0;
+    kill(getpid(),SIGUSR1);
+    sleep(1);
+    if(test==0) {
+        printf("Signals ARE BROKEN!\\n");
+        kill(0,SIGQUIT);
+    }
+    test=0;
+    kill(getpid(),SIGUSR1);
+    if(test==1)
+        exit(0);
+    else
+        exit(1);
+}
+''','.c')
+    conf.Result(rc)
+    return rc