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tracing: Add full state to trace_seq

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The trace_seq buffer might fill up, and right now one needs to check the
return value of each printf into the buffer to check for that.

Instead, have the buffer keep track of whether it is full or not, and
reject more input if it is full or would have overflowed with an input
that wasn't added.

Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Johannes Berg 2009-11-25 16:10:14 +01:00 • committed by Steven Rostedt
parent a63ce5b306
commit d184b31c0e
2 changed files with 52 additions and 11 deletions
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2
include/linux/trace_seq.h
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@ -14,6 +14,7 @@ struct trace_seq {
unsigned char buffer[PAGE_SIZE];
unsigned int len;
unsigned int readpos;
int full;
};
static inline void
@ -21,6 +22,7 @@ trace_seq_init(struct trace_seq *s)
{
s->len = 0;
s->readpos = 0;
s->full = 0;
}
/*