RE: shell and output redirection
- From: Ganesh.Raja@xxxxxxxxxxxxxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 2 Jul 2004 21:26:57 +0100
That should have been "NoT DOES TWO PROCESSES IN PARALLEL...
:)
Cheers,
Ganesh R
-----Original Message-----
From: Ganesh.Raja@xxxxxxxxxxxxxxxxxxx
Sent: 02 July 2004 21:20
To: oracle-l@xxxxxxxxxxxxx
Subject: 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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Tanel P=F5der
Sent: 02 July 2004 21:18
To: oracle-l@xxxxxxxxxxxxx
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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