1 #include <stdio.h> 2 #include <fcntl.h> 3 #include <string.h> 4 #include <stdlib.h> 5 6 #include <uv.h> 7 8 typedef struct { 9 uv_write_t req; 10 uv_buf_t buf; 11 } write_req_t; 12 13 uv_loop_t *loop; 14 uv_pipe_t stdin_pipe; 15 uv_pipe_t stdout_pipe; 16 uv_pipe_t file_pipe; 17 18 void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) { 19 *buf = uv_buf_init((char*) malloc(suggested_size), suggested_size); 20 } 21 22 void free_write_req(uv_write_t *req) { 23 write_req_t *wr = (write_req_t*) req; 24 free(wr->buf.base); 25 free(wr); 26 } 27 28 void on_stdout_write(uv_write_t *req, int status) { 29 free_write_req(req); 30 } 31 32 void on_file_write(uv_write_t *req, int status) { 33 free_write_req(req); 34 } 35 36 void write_data(uv_stream_t *dest, size_t size, uv_buf_t buf, uv_write_cb cb) { 37 write_req_t *req = (write_req_t*) malloc(sizeof(write_req_t)); 38 req->buf = uv_buf_init((char*) malloc(size), size); 39 memcpy(req->buf.base, buf.base, size); 40 uv_write((uv_write_t*) req, (uv_stream_t*)dest, &req->buf, 1, cb); 41 } 42 43 void read_stdin(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) { 44 if (nread < 0){ 45 if (nread == UV_EOF){ 46 // end of file 47 uv_close((uv_handle_t *)&stdin_pipe, NULL); 48 uv_close((uv_handle_t *)&stdout_pipe, NULL); 49 uv_close((uv_handle_t *)&file_pipe, NULL); 50 } 51 } else if (nread > 0) { 52 write_data((uv_stream_t *)&stdout_pipe, nread, *buf, on_stdout_write); 53 write_data((uv_stream_t *)&file_pipe, nread, *buf, on_file_write); 54 } 55 56 // OK to free buffer as write_data copies it. 57 if (buf->base) 58 free(buf->base); 59 } 60 61 int main(int argc, char **argv) { 62 loop = uv_default_loop(); 63 64 uv_pipe_init(loop, &stdin_pipe, 0); 65 uv_pipe_open(&stdin_pipe, 0); 66 67 uv_pipe_init(loop, &stdout_pipe, 0); 68 uv_pipe_open(&stdout_pipe, 1); 69 70 uv_fs_t file_req; 71 int fd = uv_fs_open(loop, &file_req, argv[1], O_CREAT | O_RDWR, 0644, NULL); 72 uv_pipe_init(loop, &file_pipe, 0); 73 uv_pipe_open(&file_pipe, fd); 74 75 uv_read_start((uv_stream_t*)&stdin_pipe, alloc_buffer, read_stdin); 76 77 uv_run(loop, UV_RUN_DEFAULT); 78 return 0; 79 } 80