From f971a3462face662ae8ef220a18a98354d625d54 Mon Sep 17 00:00:00 2001
From: Bryan Cantrill <bryan@joyent.com>
Date: Tue, 2 Apr 2013 13:52:19 -0700
Subject: 3673 core dumping is abysmally slow 3671 left behind enemy lines,
 agent LWP can go rogue 3670 add visibility into agent LWP's spymaster
 Reviewed by: Keith M Wesolowski <keith.wesolowski@joyent.com> Reviewed by:
 Joshua M. Clulow <jmc@joyent.com> Reviewed by: Robert Mustacchi
 <rm@joyent.com> Reviewed by: Richard Lowe <richlowe@richlowe.net> Reviewed
 by: Garrett D'Amore <garrett@damore.org> Reviewed by: Eric Schrock
 <eric.schrock@delphix.com> Approved by: Richard Lowe <richlowe@richlowe.net>

---
 usr/src/lib/libproc/common/Plwpregs.c | 37 ++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

(limited to 'usr/src/lib/libproc/common/Plwpregs.c')

diff --git a/usr/src/lib/libproc/common/Plwpregs.c b/usr/src/lib/libproc/common/Plwpregs.c
index 76f658a458..7549bc142d 100644
--- a/usr/src/lib/libproc/common/Plwpregs.c
+++ b/usr/src/lib/libproc/common/Plwpregs.c
@@ -23,7 +23,9 @@
  * Use is subject to license terms.
  */
 
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
+/*
+ * Copyright (c) 2013, Joyent, Inc. All rights reserved.
+ */
 
 #include <sys/types.h>
 #include <sys/uio.h>
@@ -348,6 +350,39 @@ Plwp_getpsinfo(struct ps_prochandle *P, lwpid_t lwpid, lwpsinfo_t *lps)
 	return (-1);
 }
 
+int
+Plwp_getspymaster(struct ps_prochandle *P, lwpid_t lwpid, psinfo_t *ps)
+{
+	lwpstatus_t lps;
+
+	if (P->state == PS_IDLE) {
+		errno = ENODATA;
+		return (-1);
+	}
+
+	if (getlwpstatus(P, lwpid, &lps) != 0)
+		return (-1);
+
+	if (!(lps.pr_flags & PR_AGENT)) {
+		errno = EINVAL;
+		return (-1);
+	}
+
+	if (P->state != PS_DEAD) {
+		return (getlwpfile(P, lwpid, "spymaster",
+		    ps, sizeof (psinfo_t)));
+	}
+
+	if (P->spymaster.pr_nlwp != 0) {
+		(void) memcpy(ps, &P->spymaster, sizeof (psinfo_t));
+		return (0);
+	}
+
+	errno = ENODATA;
+
+	return (-1);
+}
+
 int
 Plwp_stack(struct ps_prochandle *P, lwpid_t lwpid, stack_t *stkp)
 {
-- 
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