Off Topic: Question about pipes

[E. Robert Tisdale]

Madhusudan Singh wrote:

Just a basic question from someone who is new to pipes.

The statement of the problem is simple :

Instead of using popen(progname,"w"),
I wish to use the elementary functions pipe, fork, dup2, etc.
to get the same effect. You may well wonder why I am trying to do this -
I am programming in another language (Fortran 95)
where a library provides equivalents
for pipe(), fork(), dup2() etc., but [not] for popen(). I do NOT wish to depend upon underscores in the object code
and want to make my code pure Fortran 95.

I would appreciate it if someone could give me a flowchart
(with proper calls like pipe() with the arguments).

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POPEN(3) Linux Programmer’s Manual POPEN(3)

NAME
popen, pclose - process I/O

SYNOPSIS
#include <stdio.h>

FILE *popen(const char* command, const char* type);

int pclose(FILE* stream);