linux-kernel - [RFC PATCH 02/11] [BUGFIX] trace-cmd: Add waitpid() when recorders are destoried

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Date:	Mon, 19 Aug 2013 18:46:25 +0900
From:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org, yrl.pp-manager.tt@...achi.com
Subject: [RFC PATCH 02/11] [BUGFIX] trace-cmd: Add waitpid() when recorders
 are destoried

Add waitpid() when recorders are destroyed for avoiding zombie processes.
When udp_port is inappropriate, a parent process will destroy all child recorder
processes. Currently, the process does not wait for the termination of the
children, so those recorders can become zombie processes if the parent process
cannot die at once due to any reasons.

Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
---
 trace-listen.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/trace-listen.c b/trace-listen.c
index dec1c00..6c1bcac 100644
--- a/trace-listen.c
+++ b/trace-listen.c
@@ -446,6 +446,7 @@ static void process_client(const char *node, const char *port, int fd)
 	for (cpu = 0; cpu < cpus; cpu++) {
 		if (pid_array[cpu] > 0) {
 			kill(pid_array[cpu], SIGKILL);
+			waitpid(pid_array[cpu], NULL, 0);
 			delete_temp_file(node, port, cpu);
 			pid_array[cpu] = 0;
 		}

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