Created
December 7, 2017 16:45
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libuv TCP echo server example
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <uv.h> | |
#define DEFAULT_PORT 7000 | |
#define DEFAULT_BACKLOG 128 | |
uv_loop_t *loop; | |
struct sockaddr_in addr; | |
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 echo_write(uv_write_t *req, int status) { | |
if (status) { | |
fprintf(stderr, "Write error %s\n", uv_strerror(status)); | |
} | |
free_write_req(req); | |
} | |
void echo_read(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) { | |
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, client, &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, NULL); | |
} | |
free(buf->base); | |
} | |
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; | |
} | |
uv_tcp_t *client = (uv_tcp_t*) malloc(sizeof(uv_tcp_t)); | |
uv_tcp_init(loop, client); | |
if (uv_accept(server, (uv_stream_t*) client) == 0) { | |
uv_read_start((uv_stream_t*) client, alloc_buffer, echo_read); | |
} | |
else { | |
uv_close((uv_handle_t*) client, NULL); | |
} | |
} | |
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; | |
} | |
return uv_run(loop, UV_RUN_DEFAULT); | |
} |
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