linux-kernel - [PATCH 5/7] tracing/filters: disallow newline as delimeter

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Date:	Sat, 11 Apr 2009 15:55:11 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Tom Zanussi <tzanussi@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/7] tracing/filters: disallow newline as delimeter

I guess because user input is often ended with '\n' (like "echo xxx"),
thus '\n' is used as a delimeter besides ' ' ? But we can just strip
tailing spaces.

One of the effects of this patch, is fixing this inconsistency:

 # echo -n 'parent_comm ==' > filter
 bash: echo: write error: Invalid argument

 # echo 'parent_comm ==' > filter
 # cat filter
 parent_comm ==

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/trace/trace_events_filter.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 2bf4481..8e3a095 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -364,7 +364,9 @@ int filter_parse(char **pbuf, struct filter_pred *pred)
 	char *tmp, *tok, *val_str = NULL;
 	int tok_n = 0;
 
-	while ((tok = strsep(pbuf, " \n"))) {
+	strstrip(*pbuf);
+
+	while ((tok = strsep(pbuf, " "))) {
 		if (tok_n == 0) {
 			if (!strcmp(tok, "0")) {
 				pred->clear = 1;
-- 
1.5.4.rc3

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