rel_1.6.0 init

Living_SDK/kernel/vfs/vfs_file.c

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2015-2017 Alibaba Group Holding Limited
+ */
+
+#include <aos/aos.h>
+#include <vfs_conf.h>
+#include <vfs_err.h>
+#include <vfs_inode.h>
+#include <stdio.h>
+
+#define MAX_FILE_NUM (AOS_CONFIG_VFS_DEV_NODES * 2)
+static file_t files[MAX_FILE_NUM];
+
+file_t *new_file(inode_t *node)
+{
+    file_t *f;
+    int idx;
+
+    for (idx = 0; idx < MAX_FILE_NUM; idx++) {
+        f = &files[idx];
+
+        if (f->node == NULL) {
+            goto got_file;
+        }
+    }
+
+    return NULL;
+
+got_file:
+    f->node = node;
+    f->f_arg = NULL;
+    f->offset = 0;
+    inode_ref(node);
+    return f;
+}
+
+void del_file(file_t *file)
+{
+    inode_unref(file->node);
+    file->node = NULL;
+}
+
+int get_fd(file_t *file)
+{
+    return (file - files) + AOS_CONFIG_VFS_FD_OFFSET;
+}
+
+file_t *get_file(int fd)
+{
+    file_t *f;
+
+    fd -= AOS_CONFIG_VFS_FD_OFFSET;
+
+    if (fd < 0) {
+        return NULL;
+    }
+
+    if (fd >= MAX_FILE_NUM) {
+        return NULL;
+    }
+
+    f = &files[fd];
+    return f->node ? f : NULL;
+}