On Wed, 1 Dec 1999, Adriano Camargo Rodrigues da Cunha wrote:
If you think that spawning many processes for a pipe is a waste of resources
on low-end systems like MSX you should use the temporary file approach, just
like MSXDOS and MS-DOS do.
Yeah, I could, but it's not the
Shevek,
7. [wait for all processes to terminate? only last one?]
I tested yesterday. Waiting for all the process to terminate
doesn't hangs system anymore. :)
BUT: by an unknown reason, the flushing of the pipe is not correct
yet. The error seems to be in my
Adriano Camargo Rodrigues da Cunha wrote:
I thought that "broken pipe" was an error code set by kernel
when
it tries to write to a pipe that has no readers... Interesting... I'll
take a look...
In the case of a named-pipe (a fifo-special-file-thing) the writer just
goes to sleep, and
]
] That's what I did yesterday. After the forks, I put a
] for (i=0; i2; i++) {
] if ((wait(status)==pid1) close(pipe_fd[0]);
] else close(pipe_fd[1]);
] }
]
After the two forks, the shell should close both ends of the pipe, before
going into the
Hi, again, people.
Unix uses the fork()/exec() approach.
This was an important explanation, Alex. Thank you.
If you think that spawning many processes for a pipe is a waste of resources
on low-end systems like MSX you should use the temporary file approach, just
like
Hi,
Does anyone knows how a pipe between processes is implemented by
UNIX shells?
I think that lauching all processes at the same time and piping
one to another is an extreme waste of resources. And I know that MS-DOS
and MSXDOS2 have pipes and they are monotask OSs
[Howto]
cat fudeba.txt | head 20 | tail 10 | less
I know for sure (i.e. 95% ;-)) that Messy DOS uses temporary files in this
case...
(so actaully does something like:
cat fudeba.txt tmp001
head -20 tmp001 tmp002; del tmp001
tail -10 tmp002 tmp003; del tmp002
less
On Thu, 25 Nov 1999, Boon, Eric wrote:
[Howto]
cat fudeba.txt | head 20 | tail 10 | less
I know for sure (i.e. 95% ;-)) that Messy DOS uses temporary files in this
case...
(so actaully does something like:
cat fudeba.txt tmp001
head -20 tmp001 tmp002; del tmp001
] [mailto:[EMAIL PROTECTED]]On Behalf
Of Adriano
Camargo Rodrigues da Cunha
Sent: Thursday, November 25, 1999 3:01 PM
To: MSX International Mailing List
Subject: Piping
Hi,
Does anyone knows how a pipe between processes is implemented by
UNIX shells?
I think
] cat fudeba.txt | head 20 | tail 10 | less
]
] What is the (best) approach? I think that making 4 fork()/exec()
] is an extreme waste of system resources. And I don't know how making the
Unix uses the fork()/exec() approach. You can see it if you do the following in one terminal:
cat |
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