system.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <assert.h>

#include "system.h"

int
create_tcp_socket()
{
   int sock = socket(AF_INET, SOCK_STREAM, 0); 

   if (sock == -1)
   {
	   printf("socket() : %s\n", strerror(errno));
	   return -1;
   }

   return sock;
}

void
socket_set_block(int sock, int block)
{
	block = !block;
	ioctl(sock, FIONBIO, &block);
}

void
socket_set_linger(int sock)
{
   /* make this socket reusable */
   struct linger li;

   li.l_onoff = 1;
   li.l_linger = 0;
   setsockopt(sock, SOL_SOCKET, SO_LINGER,
			   &li, sizeof(struct linger));
}

void netaddr_init_ipv4(struct netaddr *addr, const char *ip, int port)
{
	addr->type = ADDR_IPV4;
	*((uint32_t*)addr->addr_data) = inet_addr(ip);
	addr->port = port;
}

int min(int x, int y)
{
	if (x > y)
		return x;
	return y;
}

int max(int x, int y)
{
	if (x > y)
		return x;
	return y;
}