/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2015-01-28 Bernard first version */ #include #ifdef RT_USING_DFS #include #endif #include #include "libc.h" #define DBG_TAG "dlib.syscall_read" #define DBG_LVL DBG_INFO #include #pragma module_name = "?__read" size_t __read(int handle, unsigned char *buf, size_t len) { #ifdef RT_USING_DFS int size; #endif if (handle == _LLIO_STDIN) { #ifdef RT_USING_POSIX if (libc_stdio_get_console() < 0) { LOG_E("invoke standard input before initializing libc"); return _LLIO_ERROR; } return read(STDIN_FILENO, buf, len); #else return _LLIO_ERROR; #endif } else if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR)) { return _LLIO_ERROR; } #ifndef RT_USING_DFS return _LLIO_ERROR; #else size = read(handle, buf, len); return size; #endif }