ftp.nice.ch/pub/next/developer/languages/lisp/AKCL.1.599.s.tar.gz#/akcl-1-599/attport/kcn.c

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#define	KCL_SELF		"/usr2/kcl/attport/saved_kcn"
#define	SYSTEM_DIRECTORY	"/usr2/kcl/attport/"

#include <stdio.h>
#include <signal.h>

#define	COMSIZ	1024

main()
{
	int in[2];
	int out[2];
	char command[COMSIZ];
	char buf[4];

	pipe(in);
	pipe(out);
	if (in[1] != 4 || out[0] != 5) {
		fprintf(stderr, "Can't get a pipe.\n");
		exit(1);
	}
	fflush(stdout);
	if (fork() != 0) {
		close(in[0]);
		close(out[1]);
		if (execl(KCL_SELF, KCL_SELF, SYSTEM_DIRECTORY, 0) < 0) {
			fprintf(stderr, "Can't exec KCL.\n");
			exit(1);
		}
	}
	signal(SIGINT, SIG_IGN);
	close(in[1]);
	close(out[0]);
	for (;;) {
		if (read(in[0], command, COMSIZ) <= 0)
			exit(0);
		buf[0] = system(command);
		write(out[1], buf, 1);
	}
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.