From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Lee <live4thee@gmail.com>
Subject: Re: Help on pipe
Date: Sat, 11 Jul 2009 11:41:41 +0800
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To: Glynn Clements <glynn@gclements.plus.com>
Cc: =?ISO-8859-2?Q?Micha=B3_Nazarewicz?= <m.nazarewicz@samsung.com>, Ardhan Madras <nightdecoder@gmail.com>, linux-c-programming@vger.kernel.org

2009/7/11 Glynn Clements <glynn@gclements.plus.com>:
>
> Micha=B3 Nazarewicz wrote:
>
>> > =A0 =A0 waitpid(pid, &ret, 0);
>> > =A0 =A0 close(fds[1]);
>>
>> No need to close.
>
> There definitely is a need to close, but it should be fclose(stream)
> *before* the waitpid(). As David points out, sort won't terminate
> until it has finished reading its input.
>
> David Lee wrote:
>
>> The sort program is waiting for an EOF (^D).
>
> Ctrl-D isn't EOF unless you're reading from a terminal. The TTY drive=
r
> "sends EOF" (i.e. causes read() to return a zero count) when you pres=
s
> Ctrl-D (by default) if the driver is in canonical mode. Ctrl-D doesn'=
t
> have any significance in other contexts.
>
Definitely!  Thanks for pointing out. :-)
And BTW, `strace' is a handy tool for diagnosing this kind of problems.

> --
> Glynn Clements <glynn@gclements.plus.com>
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--=20
Thanks,
Li Qun
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