Subj : Re: named pipe problem on linux
To   : comp.os.linux
From : richard
Date : Mon Nov 01 2004 04:49 pm

Thanks, the flush made the C program work, but not C++ (which is 
what I am trying to use). I use g++ to compile both.

----
the C program works

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
 
#include <linux/stat.h>
 
#define FIFO_FILE       "MYFIFO"
 
int main(void)
{
        FILE *fp;
                char ch;
 
        /* Create the FIFO if it does not exist */
        umask(0);
        mknod(FIFO_FILE, S_IFIFO|0666, 0);
 
                fp = fopen(FIFO_FILE, "r");
        while(  (ch=fgetc(fp)) != EOF )
        {
                printf("Received char: %c\n", ch);
                                fflush(stdout);
        }
 
                fclose(fp);
        return(0);
}

-------
the c++ program which donot work
-------
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <iostream.h>
#include <fstream.h>
                                                                                
#include <linux/stat.h>
                                                                                
#define FIFO_FILE       "MYFIFO"
                                                                                
int main(void)
{
        char ch;
                                                                                
        /* Create the FIFO if it does not exist */
        umask(0);
        mknod(FIFO_FILE, S_IFIFO|0666, 0);
                                                                                
        ifstream ifs(FIFO_FILE);
                                                                                
        while(  ifs.good() )
        {
                ifs.get(ch);
                printf("Received char: %c\n", ch);
                                fflush(stdout);
                                                                                
        }
                                                                                
        return(0);
}


On Mon, 01 Nov 2004 09:01:54 +0100, Sybren Stuvel wrote:

> ["Followup-To:" header set to comp.os.linux.]
> richard enlightened us with:
>> I have a simple test to pass information from a client to a server 
>> using named pipe.
> 
> Using C. But posting to a C++ group. Make up your mind, but at least
> don't crosspost.
> 
>> anything I missed?
> 
> Try flushing.
> 
> Sybren

.