name

#include <stdio.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

// For functions returning -1 and setting errno.
#define try(function, ...) ({ \
	int result = function(__VA_ARGS__); \
	if (result == -1) { perror(#function); exit(1); } \
	result; \
})

int main(void) {
	int s = try(socket, AF_INET, SOCK_STREAM, 0);
#ifdef main_reuse_address
	try(setsockopt, s, SOL_SOCKET, SO_REUSEADDR, &(int) { 1 }, sizeof(int));
#endif
	try(
		bind,
		s,
		(struct sockaddr *)&(struct sockaddr_in) {
			.sin_family = AF_INET,
			.sin_port = htons(
#ifdef main_port
				main_port
#else
				8000
#endif
			),
			.sin_addr.s_addr = htonl((127 << 24) + 1),
		},
		sizeof(struct sockaddr_in)
	);
	try(listen, s, SOMAXCONN);
	try(
		accept,
		s,
		(struct sockaddr *)&(struct sockaddr_storage) { 0 },
		&(socklen_t) { sizeof(struct sockaddr_storage) }
	);
}