添加rtthread相关代码

riscv/rtthread/components/net/sal/dfs_net/dfs_net.c

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+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2015-02-17     Bernard      First version
+ * 2016-05-07     Bernard      Rename dfs_lwip to dfs_net
+ * 2018-03-09     Bernard      Fix the last data issue in poll.
+ * 2018-05-24     ChenYong     Add socket abstraction layer
+ */
+
+#include <rtthread.h>
+
+#include <dfs.h>
+#include <dfs_net.h>
+
+#include <sys/socket.h>
+
+int dfs_net_getsocket(int fd)
+{
+    int socket;
+    struct dfs_file *file;
+
+    file = fd_get(fd);
+    if (file == NULL) return -1;
+
+    if (file->vnode->type != FT_SOCKET) socket = -1;
+    else socket = (int)(size_t)file->vnode->data;
+
+    return socket;
+}
+
+static int dfs_net_ioctl(struct dfs_file* file, int cmd, void* args)
+{
+    int ret;
+    int socket = (int)(size_t)file->vnode->data;
+
+    ret = sal_ioctlsocket(socket, cmd, args);
+    if (ret < 0)
+    {
+        ret = rt_get_errno();
+        return (ret > 0) ? (-ret) : ret;
+    }
+    return ret;
+}
+
+#ifdef RT_USING_DFS_V2
+static ssize_t dfs_net_read(struct dfs_file* file, void *buf, size_t count, off_t *pos)
+#else
+static ssize_t dfs_net_read(struct dfs_file* file, void *buf, size_t count)
+#endif
+{
+    int ret;
+    int socket = (int)(size_t)file->vnode->data;
+
+    ret = sal_recvfrom(socket, buf, count, 0, NULL, NULL);
+    if (ret < 0)
+    {
+        ret = rt_get_errno();
+        return (ret > 0) ? (-ret) : ret;
+    }
+
+    return ret;
+}
+
+#ifdef RT_USING_DFS_V2
+static ssize_t dfs_net_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
+#else
+static ssize_t dfs_net_write(struct dfs_file *file, const void *buf, size_t count)
+#endif
+{
+    int ret;
+    int socket = (int)(size_t)file->vnode->data;
+
+    ret = sal_sendto(socket, buf, count, 0, NULL, 0);
+    if (ret < 0)
+    {
+        ret = rt_get_errno();
+        return (ret > 0) ? (-ret) : ret;
+    }
+
+    return ret;
+}
+
+static int dfs_net_close(struct dfs_file* file)
+{
+    int socket;
+    int ret = 0;
+
+    if (file->vnode->ref_count == 1)
+    {
+        socket = (int)(size_t)file->vnode->data;
+        ret = sal_closesocket(socket);
+    }
+    return ret;
+}
+
+static int dfs_net_poll(struct dfs_file *file, struct rt_pollreq *req)
+{
+    extern int sal_poll(struct dfs_file *file, struct rt_pollreq *req);
+
+    return sal_poll(file, req);
+}
+
+const struct dfs_file_ops _net_fops =
+{
+    .close = dfs_net_close,
+    .ioctl = dfs_net_ioctl,
+    .read  = dfs_net_read,
+    .write = dfs_net_write,
+    .poll  = dfs_net_poll,
+};
+
+const struct dfs_file_ops *dfs_net_get_fops(void)
+{
+    return &_net_fops;
+}