Re: Help on pipe

[David Lee <live4thee@gmail.com>]

2009/7/11 Glynn Clements <glynn@gclements.plus.com>:
>
> Micha³ Nazarewicz wrote:
>
>> >     waitpid(pid, &ret, 0);
>> >     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 driver
> "sends EOF" (i.e. causes read() to return a zero count) when you press
> 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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-- 
Thanks,
Li Qun
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