mdtcp.c

一个C编写网络广播的程序

/* mdtcp.c -- tcp sockets support functions
 *  
 * This file is part of 'netcast' program, released under BSD License. 
 * (c) 2001-2002 Stanis砤w Pa秌o <[e-mail]>. All rights reserved.   
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include "mdist.h"
#include "mdtcp.h"
#include "util.h"

/* Open server at - optionally - given address and - optional -
   given port */
int mdtcp_open_server(char *addr,unsigned short port) {
  int s;
  struct sockaddr_in sin;
  port = port?port:MDTCP_DPORT;
  sin = make_addr(addr,port);
  if ((s=socket(AF_INET,SOCK_STREAM,0))<0) 
    crit("socket() failed, error allocationg tcp socket");
  if (bind(s,(struct sockaddr *) &sin,sizeof(struct sockaddr_in))<0)
    crit("bind() failed, error binding tcp socket");
  if (listen(s,5)<0) 
    crit("listen() failed, error listening on socket");
  MSG(3,"Server ready at %s:%d",inet_ntoa(sin.sin_addr),port);
  return s;
}

/* Open connection to server, addr is required */
int mdtcp_open_client(char *addr,unsigned short port) {
  int s;
  struct sockaddr_in sin;
  port = port?port:MDTCP_DPORT;
  sin = make_addr(addr,port);
  if ((s=socket(AF_INET,SOCK_STREAM,0))<0) 
    crit("socket() failed, error allocationg tcp socket");
  if (connect(s,(struct sockaddr *) &sin, sizeof(struct sockaddr_in))<0) 
    crit("connect() failed, cannot connect to server");
  MSG(3,"Connected to server %s:%d",inet_ntoa(sin.sin_addr),port);
  return s;
}