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Date: Tue, 10 Aug 2010 01:53:47 +0000
From: Alexander Best <arundel@freebsd.org>
To: freebsd-hackers@freebsd.org
Message-ID: <20100810015347.GA17233@freebsd.org>
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Subject: tiny sys/sys/signal.h cleanup
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hi there,

just wanted to get some feedback for this tiny patch and if people think it
makes sense.

cheers.
alex
-- 
a13x

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Index: sys/sys/signal.h
===================================================================
--- sys/sys/signal.h	(revision 211114)
+++ sys/sys/signal.h	(working copy)
@@ -47,6 +47,14 @@
 
 /*
  * System defined signals.
+ *
+ * Unlike previous signal facilities, the handler will not be reset when caught
+ * and remains installed after a signal has been delivered.
+ *
+ * With the exception of the SIGKILL and SIGSTOP signals, all other signals can
+ * be caught, be ignored, or generate an interrupt.  Any attempt to ignore or
+ * supply a handler for SIGKILL or SIGSTOP will fail with error EINVAL and no
+ * action will take place.
  */
 #if __POSIX_VISIBLE || __XSI_VISIBLE
 #define	SIGHUP		1	/* hangup */
@@ -55,9 +63,9 @@
 #if __POSIX_VISIBLE || __XSI_VISIBLE
 #define	SIGQUIT		3	/* quit */
 #endif
-#define	SIGILL		4	/* illegal instr. (not reset when caught) */
+#define	SIGILL		4	/* illegal instruction */
 #if __XSI_VISIBLE
-#define	SIGTRAP		5	/* trace trap (not reset when caught) */
+#define	SIGTRAP		5	/* trace trap */
 #endif
 #define	SIGABRT		6	/* abort() */
 #if __BSD_VISIBLE
@@ -66,7 +74,7 @@
 #endif
 #define	SIGFPE		8	/* floating point exception */
 #if __POSIX_VISIBLE || __XSI_VISIBLE
-#define	SIGKILL		9	/* kill (cannot be caught or ignored) */
+#define	SIGKILL		9	/* kill */
 #endif
 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
 #define	SIGBUS		10	/* bus error */

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