graphene/LibOS/shim/test/apps/lmbench/lmbench-2.5/src/lat_connect.c

/*
 * lat_connect.c - simple TCP connection latency test
 *
 * Three programs in one -
 *	server usage:	lat_connect -s
 *	client usage:	lat_connect hostname [N]
 *	shutdown:	lat_connect -hostname
 *
 * Copyright (c) 1994 Larry McVoy.  Distributed under the FSF GPL with
 * additional restriction that results may published only if
 * (1) the benchmark is unmodified, and
 * (2) the version in the sccsid below is included in the report.
 * Support for this development by Sun Microsystems is gratefully acknowledged.
 */
char	*id = "$Id$\n";
#include "bench.h"

void	server_main(int ac, char **av);
void	client_main(int ac, char **av);

void
doit(char *server)
{
	int	sock = tcp_connect(server, TCP_CONNECT, SOCKOPT_NONE);
	close(sock);
}

int
main(int ac, char **av)
{
	if (ac != 2) {
		fprintf(stderr, "Usage: %s -s OR %s [-]serverhost\n",
		    av[0], av[0]);
		exit(1);
	}
	if (!strcmp(av[1], "-s")) {
		if (fork() == 0) {
			server_main(ac, av);
		}
		exit(0);
	} else {
		client_main(ac, av);
	}
	exit(0);
	/* NOTREACHED */
}

void
client_main(int ac, char **av)
{
	int     sock;
	char	*server;
	char	buf[256];

	if (ac != 2) {
		fprintf(stderr, "usage: %s host\n", av[0]);
		exit(1);
	}
	server = av[1][0] == '-' ? &av[1][1] : av[1];

	/*
	 * Stop server code.
	 */
	if (av[1][0] == '-') {
		sock = tcp_connect(server, TCP_CONNECT, SOCKOPT_NONE);
		write(sock, "0", 1);
		close(sock);
		exit(0);
		/* NOTREACHED */
	}

	/*
	 * We don't want more than a few of these, they stack up in time wait.
	 * XXX - report an error if the clock is too shitty?
	 */
	BENCH(doit(server), 0);
	sprintf(buf, "TCP/IP connection cost to %s", server);
	micro(buf, get_n());
	exit(0);
	/* NOTREACHED */
}

void
server_main(int ac, char **av)
{
	int     newsock, sock, n;
	char	c;

	if (ac != 2) {
		fprintf(stderr, "usage: %s -s\n", av[0]);
		exit(1);
	}
	GO_AWAY;
	sock = tcp_server(TCP_CONNECT, SOCKOPT_REUSE);
	for (;;) {
		newsock = tcp_accept(sock, SOCKOPT_NONE);
		c = 0;
		n = read(newsock, &c, 1);
		if (n > 0 && c == '0') {
			tcp_done(TCP_CONNECT);
			exit(0);
		}
		close(newsock);
	}
	/* NOTREACHED */
}