I'm not sure if there's something I'm missing, but I'm trying to write
a script that writes to a subprocess' stdin and then reads its stdout.
The program being executed (via 'subprocess') is this C program:
/* test.c */
#include <stdio.h>
int main() {
int d;
printf("Hello World!");
scanf("%d", &d);
printf("\nDone %d\n", d);
return 0;
}
My Racket script is:
#lang racket
(define-values (p stdout stdin stderr)
(subprocess #f #f #f "./test"))
(display "123\n" stdin)
(port->string stdout)
And it hangs on reading stdout, and (char-ready? stdout) produces #f.
***********************************
The following program that doesn't have the scanf doesn't cause the
Racket script to hang:
#include <stdio.h>
int main() {
int d;
printf("Hello World!");
return 0;
}
produces
"Hello World!"
when the same Racket program above is run.
This is on Mac OS X Lion. I compile the C program with "gcc test.c -o test".
I appreciate any help!
--- nadeem
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