cancel fs req

main.cpp

#include <uv.h>

#include <cstdio>
#include <cstdlib>

void file_opened(uv_fs_t *req) {
    if (req->result < 0) {
        fprintf(stderr, "open error: %ld %s\n", req->result, uv_strerror(int(req->result)));
    } else {
        fprintf(stderr, "opening succeeded!\n");
    }
}

int main() {
    uv_loop_t *loop = (uv_loop_t *)malloc(sizeof(uv_loop_t));
    uv_loop_init(loop);

    uv_fs_t *req = (uv_fs_t *)malloc(sizeof(uv_fs_t));
    uv_fs_open(loop, req, "main.cpp", O_RDONLY, S_IRUSR, file_opened);

    int err = uv_cancel((uv_req_t *)req);
    if (err < 0) {
        fprintf(stderr, "cancel error: %d %s\n", err, uv_strerror(err));
    }

    uv_run(loop, UV_RUN_DEFAULT);

    free(req);

    uv_loop_close(loop);
    free(loop);
}