tildefriends/deps/libuv/docs/code/multi-echo-server/worker.c

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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <uv.h>
uv_loop_t *loop;
uv_pipe_t queue;
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 = 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_err_name(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 *q, ssize_t nread, const uv_buf_t *buf) {
if (nread < 0) {
if (nread != UV_EOF)
fprintf(stderr, "Read error %s\n", uv_err_name(nread));
uv_close((uv_handle_t*) q, NULL);
return;
}
uv_pipe_t *pipe = (uv_pipe_t*) q;
if (!uv_pipe_pending_count(pipe)) {
fprintf(stderr, "No pending count\n");
return;
}
uv_handle_type pending = uv_pipe_pending_type(pipe);
assert(pending == UV_TCP);
uv_tcp_t *client = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));
uv_tcp_init(loop, client);
if (uv_accept(q, (uv_stream_t*) client) == 0) {
uv_os_fd_t fd;
uv_fileno((const uv_handle_t*) client, &fd);
fprintf(stderr, "Worker %d: Accepted fd %d\n", getpid(), fd);
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_pipe_init(loop, &queue, 1 /* ipc */);
uv_pipe_open(&queue, 0);
uv_read_start((uv_stream_t*)&queue, alloc_buffer, on_new_connection);
return uv_run(loop, UV_RUN_DEFAULT);
}