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Feb 13th, 2007

Named Pipe (FIFO)

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Hi,
I'm trying to write a program using named pipes, and I'm having trouble opening it. In another program I call this line:

C++ Syntax (Toggle Plain Text)
  mkfifo("./fife", 0777);
  mkfifo("./fife", 0777);

So my named pipe exists and I see it in my list of files. Then I run the program I included below, but I can not get past the open call. Any help would be appreciated for I can not find a lot of resources on this subject.

C++ Syntax (Toggle Plain Text)
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <iostream>
 
#define MSGSIZE 14
 
void main() {
  char *message = "Hello, world!";
 
  int fd;
  fd = open("fife", O_WRONLY);
 // Can not get past this point!
 
  cout << "fd: " << fd << endl;
 
  if (write(fd, message, MSGSIZE) < 0)
    cout << "error writing" << endl;
 
  close(fd);
}
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <iostream>

#define MSGSIZE 14

void main() {
  char *message = "Hello, world!";

  int fd;
  fd = open("fife", O_WRONLY);
 // Can not get past this point!

  cout << "fd: " << fd << endl;

  if (write(fd, message, MSGSIZE) < 0)
    cout << "error writing" << endl;

  close(fd);
}

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nanodano

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Feb 13th, 2007

Re: Named Pipe (FIFO)

Look at the errno which open sets, when it returns with a failure?

Salem

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Posting Sage

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Feb 14th, 2007

Re: Named Pipe (FIFO)

I found out the problem. It waits because it wants another program to handle the other end of the pipe.

I fixed my codes up and I wrote a script like this to fix the problem:

C++ Syntax (Toggle Plain Text)
#!/bin/bash
echo "Running clients..."
./client &
./client &
 
echo "Running server..."
./server
# The & runs the program in the background, so you can run another program, playing client and server in the same console
#!/bin/bash
echo "Running clients..."
./client &
./client &

echo "Running server..."
./server
# The & runs the program in the background, so you can run another program, playing client and server in the same console

nanodano

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May 21st, 2008

Re: Named Pipe (FIFO)

can you post the client program (reading program) too?

Last edited by mustihi; May 21st, 2008 at 8:58 am.

mustihi

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May 21st, 2008

Re: Named Pipe (FIFO)

a) you're too late - by at least a year, check the dates.
b) try programming something for yourself.
c) start your own thread when you've got something to show.

Salem

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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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