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From: Graham Swallow <Information-Cascade@ntlworld.com>
To: linux-kernel@vger.kernel.org
Subject: /proc/kmsg  blocks with O_NONBLOCK, read() should return 0 with EAGAIN
Date: Mon, 23 Feb 2004 12:24:10 +0000	[thread overview]
Message-ID: <20040223122410.6eb44df1.Information-Cascade@ntlworld.com> (raw)

/proc/kmsg  blocks with O_NONBLOCK, read() should return 0 with EAGAIN

	fd = open( "/proc/kmsg", O_RDONLY|O_NONBLOCK );
	...
	poll() -- says read it

	len = read(fd,buff,len); // first read is fine
	...
	len = read(fd,buff,len); // second read blocks

I call read() a second time, because I'm feeling lucky,
(this is library code, which also reads from sockets).

I expected it to return 0 with errno==EAGAIN.
Instead it waits:  do_syslog(2,buf,count); 

I'm not on this list, so please raise a ticket, linux-2.4.23,

   thanks
--
   Graham
   Information-Cascade (at) ntlworld.com

             reply	other threads:[~2004-02-23 12:24 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-02-23 12:24 Graham Swallow [this message]
2004-02-24  0:01 ` Andrew Morton

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