Created
December 7, 2017 16:46
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libuv TCP echo server with destructor
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| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <assert.h> | |
| #include "uv.h" | |
| #define PORT 8000 | |
| typedef struct { | |
| uv_write_t req; | |
| uv_buf_t buf; | |
| } write_req_t; | |
| static uint64_t data_cntr = 0; | |
| static void on_close(uv_handle_t* handle) { | |
| free(handle); | |
| } | |
| static void after_write(uv_write_t* req, int status) { | |
| write_req_t* wr = (write_req_t*)req; | |
| if (wr->buf.base != NULL) | |
| free(wr->buf.base); | |
| free(wr); | |
| if (status == 0) | |
| return; | |
| fprintf(stderr, "uv_write error: %s\n", uv_strerror(status)); | |
| if (status == UV_ECANCELED) | |
| return; | |
| assert(status == UV_EPIPE); | |
| uv_close((uv_handle_t*)req->handle, on_close); | |
| } | |
| static void after_shutdown(uv_shutdown_t* req, int status) { | |
| /*assert(status == 0);*/ | |
| if (status < 0) | |
| fprintf(stderr, "err: %s\n", uv_strerror(status)); | |
| fprintf(stderr, "data received: %lu\n", data_cntr / 1024 / 1024); | |
| data_cntr = 0; | |
| uv_close((uv_handle_t*)req->handle, on_close); | |
| free(req); | |
| } | |
| static void after_read(uv_stream_t* handle, | |
| ssize_t nread, | |
| const uv_buf_t* buf) { | |
| int r; | |
| write_req_t* wr; | |
| uv_shutdown_t* req; | |
| if (nread <= 0 && buf->base != NULL) | |
| free(buf->base); | |
| if (nread == 0) | |
| return; | |
| if (nread < 0) { | |
| /*assert(nread == UV_EOF);*/ | |
| fprintf(stderr, "err: %s\n", uv_strerror(nread)); | |
| req = (uv_shutdown_t*) malloc(sizeof(*req)); | |
| assert(req != NULL); | |
| r = uv_shutdown(req, handle, after_shutdown); | |
| assert(r == 0); | |
| return; | |
| } | |
| data_cntr += nread; | |
| wr = (write_req_t*) malloc(sizeof(*wr)); | |
| assert(wr != NULL); | |
| wr->buf = uv_buf_init(buf->base, nread); | |
| r = uv_write(&wr->req, handle, &wr->buf, 1, after_write); | |
| assert(r == 0); | |
| } | |
| static void alloc_cb(uv_handle_t* handle, | |
| size_t suggested_size, | |
| uv_buf_t* buf) { | |
| buf->base = malloc(suggested_size); | |
| assert(buf->base != NULL); | |
| buf->len = suggested_size; | |
| } | |
| static void on_connection(uv_stream_t* server, int status) { | |
| uv_tcp_t* stream; | |
| int r; | |
| assert(status == 0); | |
| stream = malloc(sizeof(uv_tcp_t)); | |
| assert(stream != NULL); | |
| r = uv_tcp_init(uv_default_loop(), stream); | |
| assert(r == 0); | |
| stream->data = server; | |
| r = uv_accept(server, (uv_stream_t*)stream); | |
| assert(r == 0); | |
| r = uv_read_start((uv_stream_t*)stream, alloc_cb, after_read); | |
| assert(r == 0); | |
| } | |
| static int tcp_echo_server() { | |
| uv_tcp_t* tcp_server; | |
| struct sockaddr_in addr; | |
| int r; | |
| r = uv_ip4_addr("0.0.0.0", PORT, &addr); | |
| assert(r == 0); | |
| tcp_server = (uv_tcp_t*) malloc(sizeof(*tcp_server)); | |
| assert(tcp_server != NULL); | |
| r = uv_tcp_init(uv_default_loop(), tcp_server); | |
| assert(r == 0); | |
| r = uv_tcp_bind(tcp_server, (const struct sockaddr*)&addr, 0); | |
| assert(r == 0); | |
| r = uv_listen((uv_stream_t*)tcp_server, SOMAXCONN, on_connection); | |
| assert(r == 0); | |
| return 0; | |
| } | |
| int main() { | |
| int r; | |
| r = tcp_echo_server(); | |
| assert(r == 0); | |
| r = uv_run(uv_default_loop(), UV_RUN_DEFAULT); | |
| assert(r == 0); | |
| return 0; | |
| } |
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