#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int
main(int argc, char **argv)
{
	struct sockaddr_un sun;
	char *template, *file;
	pid_t pid;
	int csd, sd, flags, one;

	template = strdup("foo.XXXXXXXX");
	if (template == NULL)
		err(1, "strdup");
	file = mktemp(template);
	if (file == NULL)
		err(1, "mktemp");

	memset(&sun, 0, sizeof(sun));
	sun.sun_family = AF_LOCAL;
	sun.sun_len = sizeof(sun);
	snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", file);
	free(template);

	pid = fork();
	if (pid < 0)
		err(1, "fork");
	if (pid == 0) {
		for (;;) {
			sd = socket(PF_LOCAL, SOCK_STREAM, 0);
			if (sd < 0)
				err(1, "socket");
			one = 1;
			if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &one,
			    sizeof(one)) < 0)
				err(1, "setsockopt");
			if (bind(sd, (struct sockaddr *)&sun, sizeof(sun)) < 0)
				err(1, "bind");
			if (listen(sd, 10) != 0)
				err(1, "listen");
			usleep(random() % 10);
			(void)close(sd);
			(void)unlink(file);
		}
	} else {
		for (;;) {
			sd = socket(PF_LOCAL, SOCK_STREAM, 0);
			if (sd < 0)
				err(1, "socket");
			if ((flags = fcntl(sd, F_GETFL, 0)) < 0)
				err(1, "fcntl(F_GETFL)");
			flags |= O_NONBLOCK;
			if (fcntl(sd, F_SETFL, flags) < 0)
				err(1, "fcntl(F_SETFL)");
			(void)connect(sd, (struct sockaddr *)&sun, sizeof(sun));
			usleep(random() % 10);
			(void)close(sd);
		}
	}
	return (0);
}