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Arturo
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 Posted: Sun Mar 25, 2007 4:28 am Post subject: C/C++ Linux |
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Hey All,
Wondering if anyone can help me. I am working on an assignment for an
OS class. The assignment requires that I write code that will create 4
child processes, "producer", "filter1", "filter2", and "consumer". The
"producer" will read data from an input text file (line by line),
"filter1" will replace all " " with "*", "filter2" will replace all
"CAPS" with "LOWERCASES" and the consumer will append the new modified
data to a new output text file (this must be done line by line). I am
suppose to use pipe() to allow each process to pass data to the next
process. The picture is simply straight forward and clear, producer
reads a line, passes it to filter1; via pipe, who does his job and
then passes the new modified line to filter2; via pipe, who does his
job and then passes the new modified line to the consumer, via pipe;
who finally outputs the new modified line in a text file. This process
is repeated until the input file is completely modified. Very simple,
however, I need to specifically use: vfork(), wait(), exit(), and
pipe(). I read up on this stuff and it seems straight forward but I am
having a difficult time making it all work. Can someone please atleast
just give me a hint or some guidance on how I should approach this
problem.
Thanks,
Art |
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Phlip
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| Posted: Sun Mar 25, 2007 4:36 am Post subject: Re: C/C++ Linux |
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Arturo:
| Quote: |
Wondering if anyone can help me. I am working on an assignment for an
OS class.
|
Tip: Break text up into paragraphs, to make it easier to read.
| Quote: |
The assignment requires that I write code that will create 4
child processes, "producer", "filter1", "filter2", and "consumer". The
"producer" will read data from an input text file (line by line),
"filter1" will replace all " " with "*", "filter2" will replace all
"CAPS" with "LOWERCASES" and the consumer will append the new modified
data to a new output text file (this must be done line by line).
|
And you have written a scratch project that uses tolower and toupper on its
STDIN and STDOUT first, right?
| Quote: |
I am
suppose to use pipe() to allow each process to pass data to the next
process. The picture is simply straight forward and clear, producer
reads a line, passes it to filter1; via pipe, who does his job and
then passes the new modified line to filter2; via pipe, who does his
job and then passes the new modified line to the consumer, via pipe;
who finally outputs the new modified line in a text file. This process
is repeated until the input file is completely modified. Very simple,
however, I need to specifically use: vfork(), wait(), exit(), and
pipe(). I read up on this stuff and it seems straight forward but I am
having a difficult time making it all work. Can someone please atleast
just give me a hint or some guidance on how I should approach this
problem.
|
Post a sample of your code (containing a confession it is homework) to a
newsgroup with Linux and C in its name. This newsgroup covers generic
things, so you might get less than ideal results here!
--
Phlip
http://www.greencheese.us/ZeekLand <-- NOT a blog!!! |
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Arturo
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| Posted: Sun Mar 25, 2007 9:43 pm Post subject: Re: C/C++ Linux |
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On Mar 24, 8:36 pm, "Phlip" <phlip...@yahoo.com> wrote:
| Quote: |
Arturo:
Wondering if anyone can help me. I am working on an assignment for an
OS class.
Tip: Break text up into paragraphs, to make it easier to read.
The assignment requires that I write code that will create 4
child processes, "producer", "filter1", "filter2", and "consumer". The
"producer" will read data from an input text file (line by line),
"filter1" will replace all " " with "*", "filter2" will replace all
"CAPS" with "LOWERCASES" and the consumer will append the new modified
data to a new output text file (this must be done line by line).
And you have written a scratch project that uses tolower and toupper on its
STDIN and STDOUT first, right?
I am
suppose to use pipe() to allow each process to pass data to the next
process. The picture is simply straight forward and clear, producer
reads a line, passes it to filter1; via pipe, who does his job and
then passes the new modified line to filter2; via pipe, who does his
job and then passes the new modified line to the consumer, via pipe;
who finally outputs the new modified line in a text file. This process
is repeated until the input file is completely modified. Very simple,
however, I need to specifically use: vfork(), wait(), exit(), and
pipe(). I read up on this stuff and it seems straight forward but I am
having a difficult time making it all work. Can someone please atleast
just give me a hint or some guidance on how I should approach this
problem.
Post a sample of your code (containing a confession it is homework) to a
newsgroup with Linux and C in its name. This newsgroup covers generic
things, so you might get less than ideal results here!
--
Phlip
http://www.greencheese.us/ZeekLand<-- NOT a blog!!!
And you have written a scratch project that uses tolower and toupper on its
STDIN and STDOUT first, right?
|
I'm not sure what you mean by "scratch project", but I am using
islower(), tolower() and isupper(), toupper to manipulate the ASCII
values.
| Quote: |
Post a sample of your code (containing a confession it is homework) to a
newsgroup with Linux and C in its name. This newsgroup covers generic
things, so you might get less than ideal results here!
|
Thanks |
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