first commit for chrg

rt-thread/components/dfs/dfs_v2/filesystems/procfs/proc_cpuinfo.c

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#include "proc.h"
+#include "procfs.h"
+
+#include <rthw.h>
+#include <rtdbg.h>
+
+#include <fcntl.h>
+#include <errno.h>
+
+#include <dfs_dentry.h>
+
+static void *seq_start(struct dfs_seq_file *seq, off_t *index)
+{
+    off_t i = *index; // seq->index
+
+    return NULL + (i == 0);
+}
+
+static void seq_stop(struct dfs_seq_file *seq, void *data)
+{
+}
+
+static void *seq_next(struct dfs_seq_file *seq, void *data, off_t *index)
+{
+    /* data: The return value of the start or next*/
+    off_t i = *index + 1; // seq->index
+
+    *index = i;
+
+    return NULL;
+}
+
+static int seq_show(struct dfs_seq_file *seq, void *data)
+{
+    /* data: The return value of the start or next*/
+    dfs_seq_puts(seq, "rt_weak const struct dfs_seq_ops *cpuinfo_get_seq_ops(void)\n--need your own function--\n");
+
+    return 0;
+}
+
+static const struct dfs_seq_ops seq_ops = {
+    .start  = seq_start,
+    .stop   = seq_stop,
+    .next   = seq_next,
+    .show   = seq_show,
+};
+
+rt_weak const struct dfs_seq_ops *cpuinfo_get_seq_ops(void)
+{
+    return &seq_ops;
+}
+
+static int proc_open(struct dfs_file *file)
+{
+    return dfs_seq_open(file, cpuinfo_get_seq_ops());
+}
+
+static int proc_close(struct dfs_file *file)
+{
+    return dfs_seq_release(file);
+}
+
+static const struct dfs_file_ops file_ops = {
+    .open   = proc_open,
+    .read   = dfs_seq_read,
+    .lseek  = dfs_seq_lseek,
+    .close  = proc_close,
+};
+
+int proc_cpuinfo_init(void)
+{
+    struct proc_dentry *dentry = proc_create_data("cpuinfo", 0, NULL, &file_ops, NULL);
+    proc_release(dentry);
+
+    return 0;
+}
+INIT_ENV_EXPORT(proc_cpuinfo_init);