New BSD compatible signal function

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@212 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/signal.c

@@ -0,0 +1,40 @@
+#include "bsd_locl.h"
+
+RCSID("$Id$");
+
+/*
+ * Bugs:
+ *
+ * Do we need any extra hacks for SIGCLD and/or SIGCHLD?
+ */
+
+typedef RETSIGTYPE (*SigAction)(/* int??? */);
+
+
+SigAction
+signal(int iSig, SigAction pAction)
+{
+    struct sigaction saNew, saOld;
+
+    saNew.sa_handler = pAction;
+    sigemptyset(&saNew.sa_mask);
+    saNew.sa_flags = 0;
+
+    if (iSig == SIGALRM)
+	{
+#ifdef SA_INTERRUPT
+	    saNew.sa_flags |= SA_INTERRUPT;
+#endif
+	}
+    else
+	{
+#ifdef SA_RESTART
+	    saNew.sa_flags |= SA_RESTART;
+#endif
+	}
+
+    if (sigaction(iSig, &saNew, &saOld) < 0)
+	return(SIG_ERR);
+
+    return(saOld.sa_handler);
+}