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Date:      Wed, 20 Feb 2013 04:14:32 +0000 (UTC)
From:      Jamie Gritton <jamie@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org
Subject:   svn commit: r247019 - stable/9/usr.sbin/jail
Message-ID:  <201302200414.r1K4EWax019379@svn.freebsd.org>
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Author: jamie
Date: Wed Feb 20 04:14:31 2013
New Revision: 247019
URL: http://svnweb.freebsd.org/changeset/base/247019

Log:
  MFC r246804:
  
    Handle (ignore) when a process disappears before it can be tracked.

Modified:
  stable/9/usr.sbin/jail/command.c
Directory Properties:
  stable/9/usr.sbin/jail/   (props changed)

Modified: stable/9/usr.sbin/jail/command.c
==============================================================================
--- stable/9/usr.sbin/jail/command.c	Wed Feb 20 03:59:45 2013	(r247018)
+++ stable/9/usr.sbin/jail/command.c	Wed Feb 20 04:14:31 2013	(r247019)
@@ -66,7 +66,7 @@ int paralimit = -1;
 extern char **environ;
 
 static int run_command(struct cfjail *j);
-static void add_proc(struct cfjail *j, pid_t pid);
+static int add_proc(struct cfjail *j, pid_t pid);
 static void clear_procs(struct cfjail *j);
 static struct cfjail *find_proc(pid_t pid);
 static int term_procs(struct cfjail *j);
@@ -542,13 +542,12 @@ run_command(struct cfjail *j)
 	if (pid < 0)
 		err(1, "fork");
 	if (pid > 0) {
-		if (bg) {
+		if (bg || !add_proc(j, pid)) {
 			free(j->comline);
 			j->comline = NULL;
 			return 0;
 		} else {
 			paralimit--;
-			add_proc(j, pid);
 			return 1;
 		}
 	}
@@ -622,7 +621,7 @@ run_command(struct cfjail *j)
 /*
  * Add a process to the hash, tied to a jail.
  */
-static void
+static int
 add_proc(struct cfjail *j, pid_t pid)
 {
 	struct kevent ke;
@@ -632,8 +631,11 @@ add_proc(struct cfjail *j, pid_t pid)
 	if (!kq && (kq = kqueue()) < 0)
 		err(1, "kqueue");
 	EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL);
-	if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0)
+	if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) {
+		if (errno == ESRCH)
+			return 0;
 		err(1, "kevent");
+	}
 	ph = emalloc(sizeof(struct phash));
 	ph->j = j;
 	ph->pid = pid;
@@ -658,6 +660,7 @@ add_proc(struct cfjail *j, pid_t pid)
 			TAILQ_INSERT_TAIL(&sleeping, j, tq);
 		j->queue = &sleeping;
 	}
+	return 1;
 }
 
 /*
@@ -730,7 +733,7 @@ term_procs(struct cfjail *j)
 	for (i = 0; i < pcnt; i++)
 		if (ki[i].ki_jid == j->jid &&
 		    kill(ki[i].ki_pid, SIGTERM) == 0) {
-			add_proc(j, ki[i].ki_pid);
+			(void)add_proc(j, ki[i].ki_pid);
 			if (verbose > 0) {
 				if (!noted) {
 					noted = 1;

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