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To: Daniel Podlejski <underley@underley.eu.org>
Cc: Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: Re: Incorect signal handling ?
In-Reply-To: <20010412223128.A11625@witch.underley.eu.org>
From: Doug McNaught <doug@wireboard.com>
Date: 12 Apr 2001 17:56:37 -0400
In-Reply-To: Daniel Podlejski's message of "Thu, 12 Apr 2001 22:31:28 +0200"
Message-ID: <m3r8yxrdd6.fsf@belphigor.mcnaught.org>
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Daniel Podlejski <underley@underley.eu.org> writes:

> Hi,
> 
> there is litlle programm:
> 
> 	signal (SIGALRM, empty);
> 	alarm (1);
> 
>         a = read(fd, buf, 511);
> 
>         while (a && a != -1) a = read(fd, buf, 511);

> I open /tmp/nic and run compiled program.
> There should be error EINTR in read, but isn't.

"Fast" system calls (eg reads from disk) are generally
uninterruptible; thus the signal will be deferred until the read()
returns.

-Doug
-
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