Implement write queue for iomux

test/console_print.c

@@ -0,0 +1,80 @@
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ucore/utils.h>
+#include <ucore/utils.h>
+#include <ucore/iomux.h>
+#include <ucore/wqueue.h>
+
+
+int stdout_read(struct IOMux *mux, struct IOMuxFD *fd)
+{
+    return 1;
+}
+void stdin_read_cb(struct IOMux *mux, struct IOMuxFD *fd, unsigned int event)
+{
+    struct MBuf *mbuf = uc_mbuf_new(512);
+    uint8_t *buf = uc_mbuf_head(mbuf);
+
+    ssize_t len = read(fd->fd, buf, sizeof buf);
+    
+    printf("Read %d bytes\n", len);
+    if (len <= 0) {
+        uc_mbuf_free(mbuf);
+        return;
+    }
+    uc_mbuf_put(mbuf, len);
+    
+    struct UCWQueue *wqueue = fd->cookie_ptr;
+    uc_wqueue_enqueue(wqueue, mbuf);
+}
+
+struct IOMuxFD stdin_fd = {
+    .fd = 0,
+    .what = MUX_EV_READ,
+    .callback = stdin_read_cb,
+
+};
+
+int stdout_write(struct IOMux *mux, struct IOMuxFD *fd, struct MBuf *mbuf)
+{
+    uint32_t len;
+    ssize_t wlen;
+    uint8_t *data;
+
+    len = uc_mbuf_len(mbuf);
+    data = uc_mbuf_pull(mbuf, len);
+    wlen = write(fd->fd, data, len);
+
+    if (wlen < 0) {
+        perror("write");
+        return -1;
+    }
+
+    if (wlen == len) {
+        return 1;
+    }
+
+    return 0;
+}
+
+struct UCWQueue stdout_queue;
+
+int main(int argc, char *argv[])
+{
+    struct IOMux *mux = iomux_create(IOMUX_TYPE_DEFAULT);
+    uc_wqueue_init(&stdout_queue, mux);
+    stdin_fd.cookie_ptr = &stdout_queue;
+    stdout_queue.fd.fd = 1;
+    stdout_queue.fd.what = MUX_EV_READ;
+    stdout_queue.write_cb = stdout_write;
+    stdout_queue.read_cb = stdout_read;
+
+    iomux_register_fd(mux, &stdin_fd);
+    iomux_register_fd(mux, &stdout_queue.fd);
+    iomux_run(mux);
+
+    return 0;
+}
+