import RT-Thread@9217865c without bsp, libcpu and components/net

components/libc/posix/io/mman/mman.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/11/30     Bernard      The first version.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+
+#include <rtthread.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/statfs.h>
+#include <sys/errno.h>
+
+#include "sys/mman.h"
+
+void *mmap(void *addr, size_t length, int prot, int flags,
+    int fd, off_t offset)
+{
+    uint8_t *mem;
+
+    if (addr)
+    {
+        mem = addr;
+    }
+    else mem = (uint8_t *)malloc(length);
+
+    if (mem)
+    {
+        off_t cur;
+        size_t read_bytes;
+
+        cur = lseek(fd, 0, SEEK_SET);
+
+        lseek(fd, offset, SEEK_SET);
+        read_bytes = read(fd, mem, length);
+        if (read_bytes != length)
+        {
+            if (addr == RT_NULL)
+            {
+                /* read failed */
+                free(mem);
+                mem = RT_NULL;
+            }
+        }
+        lseek(fd, cur, SEEK_SET);
+
+        return mem;
+    }
+
+    errno = ENOMEM;
+
+    return MAP_FAILED;
+}
+
+int munmap(void *addr, size_t length)
+{
+    if (addr)
+    {
+        free(addr);
+        return 0;
+    }
+
+    return -1;
+}