前言

网上关于libuv的代码示例较少，官方文档和代码中的示例都只是给了简单的例子，实际使用的时候可能会遇到很多内存泄漏和指针异常的问题

代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <uv.h>
#define CRTDBG_MAP_ALLOC
#include "crtdbg.h"

#define DEFAULT_PORT 7000
#define DEFAULT_BACKLOG 128
struct sockaddr_in toaddr;
uv_loop_t *loop;
struct sockaddr_in addr;

#define CONTAINER_OF(ptr, type, member) \
  ((type *) ((char *) (ptr) - offsetof(type, member)))

struct mysocket{
    uv_tcp_t stream;
    uv_timer_t streamtime;

    uv_tcp_t tostream;

};

typedef struct {
    uv_write_t req;
    uv_buf_t buf;
} write_req_t;

void free_write_req(uv_write_t *req) {
    write_req_t *wr = (write_req_t*) req;
    free(wr->buf.base);
    free(wr);
}

void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
    buf->base = (char*) malloc(suggested_size);
    buf->len = suggested_size;
}

void on_close(uv_handle_t* handle) {
    printf("on_close\n");

    struct mysocket *myysocket;
    myysocket = CONTAINER_OF(handle,struct mysocket,stream);
    free(myysocket);
}

void on_closeto(uv_handle_t* handle) {
    printf("on_close\n");

    struct mysocket *myysocket;
    myysocket = CONTAINER_OF(handle,struct mysocket,tostream);
    free(myysocket);
}

void echo_write(uv_write_t *req, int status) {
    if (status) {
        fprintf(stderr, "Write error %s\n", uv_strerror(status));
    }
    printf("echo_write\n");
    free_write_req(req);
}

void socket_timer_expire_cb(uv_timer_t *handle)
{
    struct mysocket *myysocket;
    printf("socket_timer_expire_cb\n");
    myysocket = CONTAINER_OF(handle,struct mysocket,streamtime);
    uv_timer_stop(&myysocket->streamtime);
    uv_close((uv_handle_t*)&myysocket->stream,NULL);
    uv_close((uv_handle_t*)&myysocket->tostream,NULL);
    uv_close((uv_handle_t*)handle,NULL);
    free(myysocket);
}
void echo_read(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) {
    printf("echo_read\n");
    uv_tcp_t *streamto = client->data;
    struct mysocket *myysocket;
    myysocket = CONTAINER_OF(client,struct mysocket,stream);
    if (nread > 0) {
        write_req_t *req = (write_req_t*) malloc(sizeof(write_req_t));
        req->buf = uv_buf_init(buf->base, nread);
        uv_write((uv_write_t*) req, streamto, &req->buf, 1, echo_write);
        return;
    }

    if (nread < 0) {
        if (nread != UV_EOF)
            fprintf(stderr, "Read error %s\n", uv_err_name(nread));
        uv_close((uv_handle_t*) client, on_close);
    }
    free(buf->base);
}


void echo_readto(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) {
    printf("echo_readto\n");
    uv_tcp_t *streamto = client->data;
    struct mysocket *myysocket;
    myysocket = CONTAINER_OF(streamto,struct mysocket,tostream);
    uv_timer_t* streamtime = &myysocket->streamtime;

    if (nread > 0) {
        write_req_t *req = (write_req_t*) malloc(sizeof(write_req_t));
        req->buf = uv_buf_init(buf->base, nread);
        uv_write((uv_write_t*) req, streamto, &req->buf, 1, echo_write);
        uv_timer_start(streamtime, socket_timer_expire_cb, 20000, 0);
        printf("%p\n",&myysocket->streamtime);

        return;
    }
    if (nread < 0) {
        if (nread != UV_EOF)
            fprintf(stderr, "Read error %s\n", uv_err_name(nread));

        uv_close((uv_handle_t*) streamto, on_closeto);
    }
    free(buf->base);
}



void on_connect(uv_connect_t *req, int status) {
    if (status < 0) {
        fprintf(stderr, "connect failed error %s\n", uv_err_name(status));
        free(req);
        return;
    }
    struct mysocket *myysocket;
    myysocket = CONTAINER_OF(req->handle,struct mysocket,tostream);
    uv_stream_t *tostream = &myysocket->tostream;


    uv_tcp_keepalive(tostream,1,10);
    uv_tcp_keepalive(tostream->data,1,10);
    uv_read_start((uv_stream_t*) tostream, alloc_buffer, echo_read);
    uv_read_start((uv_stream_t*) tostream->data, alloc_buffer, echo_readto);
    free(req);
}

void on_new_connection(uv_stream_t *server, int status) {
    if (status < 0) {
        fprintf(stderr, "New connection error %s\n", uv_strerror(status));
        // error!
        return;
    }

    struct mysocket *myysocket = (struct mysocket*) malloc(sizeof (struct mysocket));
    server->loop->data = myysocket;
    uv_tcp_t *client = &myysocket->stream;
    uv_tcp_t *streamto = &myysocket->tostream;

    uv_timer_t* streamtime = &myysocket->streamtime;
    uv_tcp_init(loop, client);
    uv_timer_init(loop,streamtime);
    if (uv_accept(server, (uv_stream_t*) client) != 0) {
        uv_close((uv_handle_t*) client, on_close);
    }
    uv_ip4_addr("192.168.164.128", 80, &toaddr);
    uv_connect_t *connect_req = (uv_connect_t*) malloc(sizeof(uv_connect_t));
    uv_tcp_init(loop, streamto);
    streamto->data=(uv_stream_t*)client;
    client->data=(uv_stream_t*)streamto;
    uv_tcp_connect(connect_req, streamto, (const struct sockaddr*) &toaddr, on_connect);
}

int main() {
    loop = uv_default_loop();

    uv_tcp_t server;
    uv_tcp_init(loop, &server);

    uv_ip4_addr("0.0.0.0", DEFAULT_PORT, &addr);

    uv_tcp_bind(&server, (const struct sockaddr*)&addr, 0);
    int r = uv_listen((uv_stream_t*) &server, DEFAULT_BACKLOG, on_new_connection);
    if (r) {
        fprintf(stderr, "Listen error %s\n", uv_strerror(r));
        return 1;
    }
    uv_run(loop, UV_RUN_DEFAULT);
    _CrtDumpMemoryLeaks();
    uv_loop_close(loop);
    return 0;
}