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From: Uno on 23 Apr 2010 04:15
I would like to call a c function using the iso_c_binding. I thought I
had a template for this in a place that I could readily access, but
apparently, I don't.

I have Mr&C and the Fortran 2003 Handbook as references.

The idea is that I'm asking my OS a simple question like uname. To be
returned from the C part is a char * and an integer that exceeds the
necessary size of a buffer to hold it.

The C part wouldn't look a whole lot different from this:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int main(void)
{
FILE *stream;
char *sys;
sys = malloc(100);
stream = popen("/bin/uname -snm", "r");
fscanf( stream, "%31[^\n]", sys );
printf("sys is %s\n", sys);
pclose(stream);
return 0;
}

// gcc -D_GNU_SOURCE -std=c99 -Wall -Wextra r1.c -o out

, except that main is no longer there.

So, with this as an example, I'm looking for an interface that can
return the char * sys, as well as the 100, if that were big enough to
accomodate uname, which it seems to be by orders of magnitude.

How do I do this?
--
Uno
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