socket服务端代码

socket服务端代码如果开发者对于本文件有需要的可以参考。
#include
#include
#include

#include
#include

printf("accept a client %d\n", sockfd);

struct event_base* base = (event_base*)arg;

//仅仅是为了动态创建一个event结构体
struct event *ev = event_new(NULL, -1, 0, NULL, NULL);
//将动态创建的结构体作为event的回调参数
event_assign(ev, base, sockfd, EV_READ | EV_PERSIST,
socket_read_cb, (void*)ev);

event_add(ev, NULL);
}


void socket_read_cb(int fd, short events, void *arg)
{
char msg[4096];
struct event *ev = (struct event*)arg;
int len = read(fd, msg, sizeof(msg) - 1);



if( len <= 0 )
{
printf("some error happen when read\n");
event_free(ev);
close(fd);
return ;
}

msg[len] = '\0';
printf("recv the client msg: %s", msg);

char reply_msg[4096] = "I have recvieced the msg: ";
strcat(reply_msg strlen(reply_msg), msg);

write(fd, reply_msg, strlen(reply_msg) );
}



typedef struct sockaddr SA;
int tcp_server_init(int port, int listen_num)
{
int errno_save;
evutil_socket_t listener;

listener = ::socket(AF_INET, SOCK_STREAM, 0);
if( listener == -1 )
return -1;

//允许多次绑定同一个地址。要用在socket和bind之间
evutil_make_listen_socket_reuseable(listener);

struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = 0;
sin.sin_port = htons(port);

if( ::bind(listener, (SA*)&sin, sizeof(sin)) < 0 )
goto error;

if( ::listen(listener, listen_num) < 0)
goto error;


//跨平台统一接口，将套接字设置为非阻塞状态
evutil_make_socket_nonblocking(listener);

return listener;

error:
errno_save = errno;
evutil_closesocket(listener);
errno = errno_save;

return -1;
}