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>

1 files changed, 36 insertions, 1 deletions

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>
@@ -349,6 +351,39 @@ Plwp_getpsinfo(struct ps_prochandle *P, lwpid_t lwpid, lwpsinfo_t *lps)
 }
 
 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)
 {
 	uintptr_t addr;