Re: [LIP] confusion about half-duplex pipes.

Shehjar u are confused about what fork does ? Read fork again perhaps tht
will answer a lot more questions tht u mite get for other things
Fork creates a copy of the existing process and does not share so closing a
file in the child or vice versa doesnt affect nething in the parent

Come to think abt it u must have read tht the parent gets a SIGCLD when the
child exits if the child/parent were to share address space the signal would
be delivered to both but it is only delivered to the parent


-SIGTERM
amit

----- Original Message -----
From: "Shehjar Tikoo" <shehjar_tikoo-/[email protected]>
To: <linux-india-programmers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Sent: Wednesday, November 12, 2003 1:18 PM
Subject: [LIP] confusion about half-duplex pipes.


> Hi all.
> I'd be grateful if somebody solved this confusion I
> have about IPC using half-duplex pipes.Read on for
> where I am getting stuck.
>
> A parent forks a child after creating a pipe using the
> pipe function.
> In the situation where child wants to read and parent
> wants to write to
> the pipe, the child closes the fd[1] file descriptor
> and parent closes the fd[0] file descriptor, since
> these are not needed by them.What I
> want to know is that, since the parent and child are
> working on the same address space, should'nt the
> closing of both of those file
> descriptors( though in separate processes..) close the
> pipe.Leaving no file descriptor for reading and
> writing open.
>
> I know I am wrong here coz this is not what happens, I
> am counting on some of you to correct me and explain
> what really goes on here.
>
> Thanks.
> Shehjar
>
>
>
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