view rvinterf/libinterf/launchrvif.c @ 926:6a0aa8d36d06

rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +0000 (2023-05-23)
parents e40bb5a6c6b9
children
line wrap: on
line source
/*
 * This module implements the optional "behind the scenes" invokation
 * of rvinterf from client programs.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "exitcodes.h"

static char rvinterf_pathname[] = "/opt/freecalypso/bin/rvinterf";

extern int sock;

char *rvinterf_ttyport, *rvinterf_Bopt, *rvinterf_lopt, *rvinterf_wopt;

launch_rvinterf(do_delay)
{
	int sp[2], rc;
	char *rvif_argv[11], Sarg[16], **ap;

	rc = socketpair(AF_UNIX, SOCK_STREAM, 0, sp);
	if (rc < 0) {
		perror("socketpair");
		exit(ERROR_UNIX);
	}
	sock = sp[0];
	sprintf(Sarg, "-S%d", sp[1]);
	ap = rvif_argv;
	*ap++ = "rvinterf";
	*ap++ = Sarg;
	*ap++ = "-n";
	if (rvinterf_Bopt) {
		*ap++ = "-B";
		*ap++ = rvinterf_Bopt;
	}
	if (rvinterf_lopt) {
		*ap++ = "-l";
		*ap++ = rvinterf_lopt;
	}
	if (rvinterf_wopt) {
		*ap++ = "-w";
		*ap++ = rvinterf_wopt;
	}
	*ap++ = rvinterf_ttyport;
	*ap = 0;
	rc = vfork();
	if (rc < 0) {
		perror("vfork for launching rvinterf");
		exit(ERROR_UNIX);
	}
	if (!rc) {
		/* we are in the child - do the exec */
		close(sp[0]);
		execv(rvinterf_pathname, rvif_argv);
		perror(rvinterf_pathname);
		_exit(1);
	}
	close(sp[1]);
	if (do_delay)
		usleep(30000);
	return 0;
}