Try these. They are super simple and don't take errors and broken-pipe conditions into account. Start the c program, then start the perl program. The perl program could be launched from c if you wanted.

#include <stdio.h>

int main(void)
{
FILE *fp;
/* char *line;  updated correction */
char line[256];   

if (mkfifo ("age-pipe", 0755) != 0)
{printf ("Could not make this fifo\n");}
else {printf ("FIFO was successfully made!\n");}

fp = fopen ("age-pipe", "r");

for(;;){
fgets (line,256, fp);
printf ("message: %s\n", line);
}
close (fp);
}
[download]

#!/usr/bin/perl
use strict;
use warnings;

open(FIFO, "> age-pipe") or die $!;

select FIFO; $|=1;
select STDOUT;$|=1;

my $input = 'a';
while(1){
print "Enter your age:\n";
#my $input = <STDIN>;
print FIFO "$input\n";
sleep(1);
$input++
}

close(FIFO);
[download]

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