libevent使用简单示例

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>

#include <netinet/tcp.h>
#include <my_net.h>

#include <event.h>

#define TRACE_INT(v,fmt,args...) do {\
    if(v < 0) {\
        fprintf(stderr,fmt"\n",##args);\
        return -1;\
    }\
}while(0)

#define TRACE_POT(v,fmt,args...) do {\
    if(v == NULL) {\
        fprintf(stderr,fmt"\n",##args);\
        return -1;\
    }\
}while(0)


int32_t DEFAULT_LISTEN_PORT = 7123;
int32_t DEFAULT_LISTEN_SIZE = 100;


int32_t g_listen_port;
int32_t g_listen_size;

struct event_base *g_event_base;



void init_server_data()
{
    g_listen_port = DEFAULT_LISTEN_PORT;
    g_listen_size = DEFAULT_LISTEN_SIZE; 
}


int init_server_socket(int32_t listen_port,int32_t listen_size)
{
    int listen_fd ;
    int on = 1;
    int err = 0;
    
    listen_fd = my_tcplisten(listen_port,listen_size);
    TRACE_INT(listen_fd,"open tcp listen fail");
    
    err = setsockopt(listen_fd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on));
    TRACE_INT(err,"setsockopt reuse address fail");

    err = setsockopt(listen_fd,IPPROTO_TCP,TCP_NODELAY,&on,sizeof(on));
    TRACE_INT(err,"setsockopt nodelay fail");

    return listen_fd;

}

void server_loop(int listen_fd,short,void *)
{
    
    char buf[100];
    int cli_fd = my_accept(listen_fd,NULL,NULL);

    if(read(cli_fd,buf,sizeof(buf))!=0)
    {
        fprintf(stdout,"%s\n",buf);
    }

    close(cli_fd);

    return ;
}


int main()
{
    int32_t socket_fd = 0;
    init_server_data();
    socket_fd = init_server_socket(g_listen_port,g_listen_size);
    fprintf(stdout,"socket fd is %d\n",socket_fd);
    
    g_event_base = event_base_new();
    TRACE_POT(g_event_base,"new event base fail");

    struct event listen_event;
    event_set(&listen_event,socket_fd,EV_READ|EV_PERSIST,server_loop,NULL);
    event_base_set(g_event_base,&listen_event);
    event_add(&listen_event,NULL);
    event_base_dispatch(g_event_base);

    return 0;
}