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Home -> Community -> Mailing Lists -> Oracle-L -> RE: shell and output redirection
I was quite stunned to Know that is wahat happened.. I always tHought that
Pipes as the Nomal "|" does two Process Parallely ... Something new Learnt
... :)
Cheers,
Ganesh R
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]
On Behalf Of Tanel P=F5der
Sent: 02 July 2004 21:18
To: oracle-l_at_freelists.org
Subject: Re: shell and output redirection
> Programs are executed simultaneously. Pseudocode goes like this:=20
> create pipe fork process 1 {
> open pipe for output
> exec program 1 }
> fork process 2 {
> open pipe for input
> exec program 2 }
Ok, but if program 1 will issue a write request to the pipe now, shall it post process 2 and not continue before process 2 has completed?
As I saw from your trace, shell uses pipe() to create the pipe file descriptors for passing on data between processes. What if I create a pipe manually using mknod and run my two processes manually, does the data streaming work exactly the same way that with shell-generated pipe?
Tanel.
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