linux-kernel - Re: ftrace trace_raw

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Message-ID: <20191217174732.08df7689@gandalf.local.home>
Date:   Tue, 17 Dec 2019 17:47:32 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: Re: ftrace trace_raw_pipe format

On Tue, 17 Dec 2019 17:34:03 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> static void read_raw_buffer(int i, const char *buffer)
> {
> 	struct trace_seq s;
> 	char buf[page_size];
> 	int fd;
> 	int r;
> 
> 	printf("Parsing CPU %d buffer\n", i);
> 
> 	fd = open(buffer, O_RDONLY);

Changing the above to:

	fd = open(buffer, O_RDONLY|O_NONBLOCK);

Will then not make it block on empty buffers.

-- Steve

> 	if (fd < 0)
> 		pdie("Failed to open %s", buffer);