diff --git a/bsp/efm32/rtconfig.h b/bsp/efm32/rtconfig.h
index 4ee9bf1a8e..040f07fa02 100644
--- a/bsp/efm32/rtconfig.h
+++ b/bsp/efm32/rtconfig.h
@@ -213,6 +213,7 @@
 /* SECTION: Runtime library */
 // #define RT_USING_NOLIBC
 // #define RT_USING_NEWLIB
+#define RT_LIBC_USING_TIME
 
 /* SECTION: Console options */
 #define RT_USING_CONSOLE
diff --git a/bsp/lpc408x/.config b/bsp/lpc408x/.config
index 5c079205e1..b07e256c26 100644
--- a/bsp/lpc408x/.config
+++ b/bsp/lpc408x/.config
@@ -7,6 +7,7 @@
 # RT-Thread Kernel
 #
 CONFIG_RT_NAME_MAX=8
+# CONFIG_RT_USING_ARCH_DATA_TYPE is not set
 # CONFIG_RT_USING_SMP is not set
 CONFIG_RT_ALIGN_SIZE=4
 # CONFIG_RT_THREAD_PRIORITY_8 is not set
@@ -63,8 +64,9 @@ CONFIG_RT_USING_DEVICE=y
 CONFIG_RT_USING_CONSOLE=y
 CONFIG_RT_CONSOLEBUF_SIZE=128
 CONFIG_RT_CONSOLE_DEVICE_NAME="uart0"
-CONFIG_RT_VER_NUM=0x40001
+CONFIG_RT_VER_NUM=0x40003
 CONFIG_ARCH_ARM=y
+CONFIG_RT_USING_CPU_FFS=y
 CONFIG_ARCH_ARM_CORTEX_M=y
 CONFIG_ARCH_ARM_CORTEX_M4=y
 # CONFIG_ARCH_CPU_STACK_GROWS_UPWARD is not set
@@ -138,6 +140,7 @@ CONFIG_RT_USING_DFS_DEVFS=y
 #
 CONFIG_RT_USING_DEVICE_IPC=y
 CONFIG_RT_PIPE_BUFSZ=512
+# CONFIG_RT_USING_SYSTEM_WORKQUEUE is not set
 CONFIG_RT_USING_SERIAL=y
 CONFIG_RT_SERIAL_USING_DMA=y
 CONFIG_RT_SERIAL_RB_BUFSZ=64
@@ -147,10 +150,10 @@ CONFIG_RT_SERIAL_RB_BUFSZ=64
 # CONFIG_RT_USING_I2C is not set
 CONFIG_RT_USING_PIN=y
 # CONFIG_RT_USING_ADC is not set
+# CONFIG_RT_USING_DAC is not set
 # CONFIG_RT_USING_PWM is not set
 # CONFIG_RT_USING_MTD_NOR is not set
 # CONFIG_RT_USING_MTD_NAND is not set
-# CONFIG_RT_USING_MTD is not set
 # CONFIG_RT_USING_PM is not set
 # CONFIG_RT_USING_RTC is not set
 # CONFIG_RT_USING_SDIO is not set
@@ -158,10 +161,10 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_RT_USING_WDT is not set
 # CONFIG_RT_USING_AUDIO is not set
 # CONFIG_RT_USING_SENSOR is not set
-
-#
-# Using WiFi
-#
+# CONFIG_RT_USING_TOUCH is not set
+# CONFIG_RT_USING_HWCRYPTO is not set
+# CONFIG_RT_USING_PULSE_ENCODER is not set
+# CONFIG_RT_USING_INPUT_CAPTURE is not set
 # CONFIG_RT_USING_WIFI is not set
 
 #
@@ -175,6 +178,7 @@ CONFIG_RT_USING_PIN=y
 #
 # CONFIG_RT_USING_LIBC is not set
 # CONFIG_RT_USING_PTHREADS is not set
+CONFIG_RT_LIBC_USING_TIME=y
 
 #
 # Network
@@ -185,18 +189,15 @@ CONFIG_RT_USING_PIN=y
 #
 # CONFIG_RT_USING_SAL is not set
 
+#
+# Network interface device
+#
+# CONFIG_RT_USING_NETDEV is not set
+
 #
 # light weight TCP/IP stack
 #
 # CONFIG_RT_USING_LWIP is not set
-# CONFIG_RT_USING_LWIP141 is not set
-# CONFIG_RT_USING_LWIP202 is not set
-# CONFIG_RT_USING_LWIP210 is not set
-
-#
-# Modbus master and slave stack
-#
-# CONFIG_RT_USING_MODBUS is not set
 
 #
 # AT commands
@@ -211,16 +212,9 @@ CONFIG_RT_USING_PIN=y
 #
 # Utilities
 #
-# CONFIG_RT_USING_LOGTRACE is not set
 # CONFIG_RT_USING_RYM is not set
 # CONFIG_RT_USING_ULOG is not set
 # CONFIG_RT_USING_UTEST is not set
-
-#
-# ARM CMSIS
-#
-# CONFIG_RT_USING_CMSIS_OS is not set
-# CONFIG_RT_USING_RTT_CMSIS is not set
 # CONFIG_RT_USING_LWP is not set
 
 #
@@ -230,13 +224,20 @@ CONFIG_RT_USING_PIN=y
 #
 # IoT - internet of things
 #
+# CONFIG_PKG_USING_LORAWAN_DRIVER is not set
 # CONFIG_PKG_USING_PAHOMQTT is not set
+# CONFIG_PKG_USING_UMQTT is not set
 # CONFIG_PKG_USING_WEBCLIENT is not set
 # CONFIG_PKG_USING_WEBNET is not set
 # CONFIG_PKG_USING_MONGOOSE is not set
+# CONFIG_PKG_USING_MYMQTT is not set
+# CONFIG_PKG_USING_KAWAII_MQTT is not set
+# CONFIG_PKG_USING_BC28_MQTT is not set
 # CONFIG_PKG_USING_WEBTERMINAL is not set
 # CONFIG_PKG_USING_CJSON is not set
 # CONFIG_PKG_USING_JSMN is not set
+# CONFIG_PKG_USING_LIBMODBUS is not set
+# CONFIG_PKG_USING_FREEMODBUS is not set
 # CONFIG_PKG_USING_LJSON is not set
 # CONFIG_PKG_USING_EZXML is not set
 # CONFIG_PKG_USING_NANOPB is not set
@@ -254,10 +255,14 @@ CONFIG_RT_USING_PIN=y
 # Wiced WiFi
 #
 # CONFIG_PKG_USING_WLAN_WICED is not set
+# CONFIG_PKG_USING_RW007 is not set
 # CONFIG_PKG_USING_COAP is not set
 # CONFIG_PKG_USING_NOPOLL is not set
 # CONFIG_PKG_USING_NETUTILS is not set
+# CONFIG_PKG_USING_CMUX is not set
+# CONFIG_PKG_USING_PPP_DEVICE is not set
 # CONFIG_PKG_USING_AT_DEVICE is not set
+# CONFIG_PKG_USING_ATSRV_SOCKET is not set
 # CONFIG_PKG_USING_WIZNET is not set
 
 #
@@ -267,7 +272,29 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_PKG_USING_GAGENT_CLOUD is not set
 # CONFIG_PKG_USING_ALI_IOTKIT is not set
 # CONFIG_PKG_USING_AZURE is not set
-# CONFIG_PKG_USING_TENCENT_IOTKIT is not set
+# CONFIG_PKG_USING_TENCENT_IOT_EXPLORER is not set
+# CONFIG_PKG_USING_JIOT-C-SDK is not set
+# CONFIG_PKG_USING_UCLOUD_IOT_SDK is not set
+# CONFIG_PKG_USING_JOYLINK is not set
+# CONFIG_PKG_USING_NIMBLE is not set
+# CONFIG_PKG_USING_OTA_DOWNLOADER is not set
+# CONFIG_PKG_USING_IPMSG is not set
+# CONFIG_PKG_USING_LSSDP is not set
+# CONFIG_PKG_USING_AIRKISS_OPEN is not set
+# CONFIG_PKG_USING_LIBRWS is not set
+# CONFIG_PKG_USING_TCPSERVER is not set
+# CONFIG_PKG_USING_PROTOBUF_C is not set
+# CONFIG_PKG_USING_ONNX_PARSER is not set
+# CONFIG_PKG_USING_ONNX_BACKEND is not set
+# CONFIG_PKG_USING_DLT645 is not set
+# CONFIG_PKG_USING_QXWZ is not set
+# CONFIG_PKG_USING_SMTP_CLIENT is not set
+# CONFIG_PKG_USING_ABUP_FOTA is not set
+# CONFIG_PKG_USING_LIBCURL2RTT is not set
+# CONFIG_PKG_USING_CAPNP is not set
+# CONFIG_PKG_USING_RT_CJSON_TOOLS is not set
+# CONFIG_PKG_USING_AGILE_TELNET is not set
+# CONFIG_PKG_USING_NMEALIB is not set
 
 #
 # security packages
@@ -275,6 +302,8 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_PKG_USING_MBEDTLS is not set
 # CONFIG_PKG_USING_libsodium is not set
 # CONFIG_PKG_USING_TINYCRYPT is not set
+# CONFIG_PKG_USING_TFM is not set
+# CONFIG_PKG_USING_YD_CRYPTO is not set
 
 #
 # language packages
@@ -288,6 +317,9 @@ CONFIG_RT_USING_PIN=y
 #
 # CONFIG_PKG_USING_OPENMV is not set
 # CONFIG_PKG_USING_MUPDF is not set
+# CONFIG_PKG_USING_STEMWIN is not set
+# CONFIG_PKG_USING_WAVPLAYER is not set
+# CONFIG_PKG_USING_TJPGD is not set
 
 #
 # tools packages
@@ -299,6 +331,15 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_PKG_USING_RDB is not set
 # CONFIG_PKG_USING_QRCODE is not set
 # CONFIG_PKG_USING_ULOG_EASYFLASH is not set
+# CONFIG_PKG_USING_ADBD is not set
+# CONFIG_PKG_USING_COREMARK is not set
+# CONFIG_PKG_USING_DHRYSTONE is not set
+# CONFIG_PKG_USING_NR_MICRO_SHELL is not set
+# CONFIG_PKG_USING_CHINESE_FONT_LIBRARY is not set
+# CONFIG_PKG_USING_LUNAR_CALENDAR is not set
+# CONFIG_PKG_USING_BS8116A is not set
+# CONFIG_PKG_USING_GPS_RMC is not set
+# CONFIG_PKG_USING_URLENCODE is not set
 
 #
 # system packages
@@ -310,27 +351,74 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_PKG_USING_LWEXT4 is not set
 # CONFIG_PKG_USING_PARTITION is not set
 # CONFIG_PKG_USING_FAL is not set
+# CONFIG_PKG_USING_FLASHDB is not set
 # CONFIG_PKG_USING_SQLITE is not set
 # CONFIG_PKG_USING_RTI is not set
 # CONFIG_PKG_USING_LITTLEVGL2RTT is not set
 # CONFIG_PKG_USING_CMSIS is not set
 # CONFIG_PKG_USING_DFS_YAFFS is not set
 # CONFIG_PKG_USING_LITTLEFS is not set
+# CONFIG_PKG_USING_THREAD_POOL is not set
+# CONFIG_PKG_USING_ROBOTS is not set
+# CONFIG_PKG_USING_EV is not set
+# CONFIG_PKG_USING_SYSWATCH is not set
+# CONFIG_PKG_USING_SYS_LOAD_MONITOR is not set
+# CONFIG_PKG_USING_PLCCORE is not set
+# CONFIG_PKG_USING_RAMDISK is not set
+# CONFIG_PKG_USING_MININI is not set
+# CONFIG_PKG_USING_QBOOT is not set
+# CONFIG_PKG_USING_UCOSIII_WRAPPER is not set
 
 #
 # peripheral libraries and drivers
 #
+# CONFIG_PKG_USING_SENSORS_DRIVERS is not set
 # CONFIG_PKG_USING_REALTEK_AMEBA is not set
 # CONFIG_PKG_USING_SHT2X is not set
-# CONFIG_PKG_USING_AHT10 is not set
-# CONFIG_PKG_USING_AP3216C is not set
+# CONFIG_PKG_USING_SHT3X is not set
 # CONFIG_PKG_USING_STM32_SDIO is not set
 # CONFIG_PKG_USING_ICM20608 is not set
 # CONFIG_PKG_USING_U8G2 is not set
 # CONFIG_PKG_USING_BUTTON is not set
-# CONFIG_PKG_USING_MPU6XXX is not set
 # CONFIG_PKG_USING_PCF8574 is not set
+# CONFIG_PKG_USING_SX12XX is not set
+# CONFIG_PKG_USING_SIGNAL_LED is not set
+# CONFIG_PKG_USING_LEDBLINK is not set
+# CONFIG_PKG_USING_LITTLED is not set
+# CONFIG_PKG_USING_LKDGUI is not set
+# CONFIG_PKG_USING_NRF5X_SDK is not set
+# CONFIG_PKG_USING_NRFX is not set
+# CONFIG_PKG_USING_WM_LIBRARIES is not set
 # CONFIG_PKG_USING_KENDRYTE_SDK is not set
+# CONFIG_PKG_USING_INFRARED is not set
+# CONFIG_PKG_USING_ROSSERIAL is not set
+# CONFIG_PKG_USING_AGILE_BUTTON is not set
+# CONFIG_PKG_USING_AGILE_LED is not set
+# CONFIG_PKG_USING_AT24CXX is not set
+# CONFIG_PKG_USING_MOTIONDRIVER2RTT is not set
+# CONFIG_PKG_USING_AD7746 is not set
+# CONFIG_PKG_USING_PCA9685 is not set
+# CONFIG_PKG_USING_I2C_TOOLS is not set
+# CONFIG_PKG_USING_NRF24L01 is not set
+# CONFIG_PKG_USING_TOUCH_DRIVERS is not set
+# CONFIG_PKG_USING_MAX17048 is not set
+# CONFIG_PKG_USING_RPLIDAR is not set
+# CONFIG_PKG_USING_AS608 is not set
+# CONFIG_PKG_USING_RC522 is not set
+# CONFIG_PKG_USING_WS2812B is not set
+# CONFIG_PKG_USING_EMBARC_BSP is not set
+# CONFIG_PKG_USING_EXTERN_RTC_DRIVERS is not set
+# CONFIG_PKG_USING_MULTI_RTIMER is not set
+# CONFIG_PKG_USING_MAX7219 is not set
+# CONFIG_PKG_USING_BEEP is not set
+# CONFIG_PKG_USING_EASYBLINK is not set
+# CONFIG_PKG_USING_PMS_SERIES is not set
+# CONFIG_PKG_USING_CAN_YMODEM is not set
+# CONFIG_PKG_USING_LORA_RADIO_DRIVER is not set
+# CONFIG_PKG_USING_QLED is not set
+# CONFIG_PKG_USING_PAJ7620 is not set
+# CONFIG_PKG_USING_AGILE_CONSOLE is not set
+# CONFIG_PKG_USING_LD3320 is not set
 
 #
 # miscellaneous packages
@@ -341,11 +429,15 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_PKG_USING_MINILZO is not set
 # CONFIG_PKG_USING_QUICKLZ is not set
 # CONFIG_PKG_USING_MULTIBUTTON is not set
+# CONFIG_PKG_USING_FLEXIBLE_BUTTON is not set
 # CONFIG_PKG_USING_CANFESTIVAL is not set
 # CONFIG_PKG_USING_ZLIB is not set
 # CONFIG_PKG_USING_DSTR is not set
 # CONFIG_PKG_USING_TINYFRAME is not set
 # CONFIG_PKG_USING_KENDRYTE_DEMO is not set
+# CONFIG_PKG_USING_DIGITALCTRL is not set
+# CONFIG_PKG_USING_UPACKER is not set
+# CONFIG_PKG_USING_UPARAM is not set
 
 #
 # samples: kernel and components samples
@@ -356,6 +448,15 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_PKG_USING_PERIPHERAL_SAMPLES is not set
 # CONFIG_PKG_USING_HELLO is not set
 # CONFIG_PKG_USING_VI is not set
+# CONFIG_PKG_USING_NNOM is not set
+# CONFIG_PKG_USING_LIBANN is not set
+# CONFIG_PKG_USING_ELAPACK is not set
+# CONFIG_PKG_USING_ARMv7M_DWT is not set
+# CONFIG_PKG_USING_VT100 is not set
+# CONFIG_PKG_USING_ULAPACK is not set
+# CONFIG_PKG_USING_UKAL is not set
+# CONFIG_PKG_USING_CRCLIB is not set
+# CONFIG_PKG_USING_THREES is not set
 CONFIG_SOC_LPC4088=y
 
 #
diff --git a/bsp/lpc408x/rtconfig.h b/bsp/lpc408x/rtconfig.h
index 536e3712e7..25bba085a6 100644
--- a/bsp/lpc408x/rtconfig.h
+++ b/bsp/lpc408x/rtconfig.h
@@ -40,8 +40,9 @@
 #define RT_USING_CONSOLE
 #define RT_CONSOLEBUF_SIZE 128
 #define RT_CONSOLE_DEVICE_NAME "uart0"
-#define RT_VER_NUM 0x40001
+#define RT_VER_NUM 0x40003
 #define ARCH_ARM
+#define RT_USING_CPU_FFS
 #define ARCH_ARM_CORTEX_M
 #define ARCH_ARM_CORTEX_M4
 
@@ -101,26 +102,24 @@
 #define RT_SERIAL_RB_BUFSZ 64
 #define RT_USING_PIN
 
-/* Using WiFi */
-
-
 /* Using USB */
 
 
 /* POSIX layer and C standard library */
 
+#define RT_LIBC_USING_TIME
 
 /* Network */
 
 /* Socket abstraction layer */
 
 
+/* Network interface device */
+
+
 /* light weight TCP/IP stack */
 
 
-/* Modbus master and slave stack */
-
-
 /* AT commands */
 
 
@@ -130,9 +129,6 @@
 /* Utilities */
 
 
-/* ARM CMSIS */
-
-
 /* RT-Thread online packages */
 
 /* IoT - internet of things */
diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index 26e156522b..65c8d44225 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -22,11 +22,15 @@ if RT_USING_LIBC && RT_USING_DFS
 
     if RT_USING_POSIX
     config RT_USING_POSIX_MMAP
-        bool "Enable mmap() api"
+        bool "Enable mmap() API"
         default n
 
     config RT_USING_POSIX_TERMIOS
-        bool "Enable termios feature"
+        bool "Enable termios APIs"
+        default n
+
+    config RT_USING_POSIX_GETLINE
+        bool "Enable getline()/getdelim() APIs"
         default n
 
     config RT_USING_POSIX_AIO
diff --git a/components/libc/compilers/armlibc/sys/types.h b/components/libc/compilers/armlibc/sys/types.h
index 001ace4dd2..2aad77c99d 100644
--- a/components/libc/compilers/armlibc/sys/types.h
+++ b/components/libc/compilers/armlibc/sys/types.h
@@ -5,16 +5,16 @@
  *
  * Change Logs:
  * Date           Author       Notes
+ * 2020-09-05 Meco Man  fix bugs
  */
 #ifndef __TYPES_H__
 #define __TYPES_H__
 
 #include <stdint.h>
-#include <rtthread.h>
 
-typedef rt_int32_t clockid_t;
-typedef rt_int32_t key_t;       /* Used for interprocess communication. */
-typedef rt_int32_t pid_t;       /* Used for process IDs and process group IDs. */
+typedef int32_t clockid_t;
+typedef int32_t key_t;       /* Used for interprocess communication. */
+typedef int32_t pid_t;       /* Used for process IDs and process group IDs. */
 #ifndef ARCH_CPU_64BIT
 typedef signed int   ssize_t;  /* Used for a count of bytes or an error indication. */
 #else
diff --git a/components/libc/compilers/common/SConscript b/components/libc/compilers/common/SConscript
index a8d2606820..2407301405 100644
--- a/components/libc/compilers/common/SConscript
+++ b/components/libc/compilers/common/SConscript
@@ -8,12 +8,15 @@ group = []
 CPPPATH = [cwd]
 
 if GetDepend('RT_USING_LIBC'):
-        src += Glob('*.c')
+        src += Glob('*.c')      
 else:
-        if GetDepend('RT_LIBC_USING_TIME'):
+        if GetDepend('RT_LIBC_USING_TIME') and not GetDepend('RT_USING_MINILIBC'):
                 src += ['time.c']
 
-if (rtconfig.PLATFORM == 'armcc' or rtconfig.PLATFORM == 'iar') and rtconfig.ARCH != 'sim' :
-        group = DefineGroup('libc', src, depend = [''], CPPPATH = CPPPATH)
+if GetDepend('RT_USING_POSIX') == False:
+        SrcRemove(src, ['unistd.c'])
+
+if not GetDepend('RT_USING_MINILIBC') and (GetDepend('RT_USING_LIBC') or GetDepend('RT_LIBC_USING_TIME')):
+	group = DefineGroup('libc', src, depend = [''], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/libc/compilers/common/readme.md b/components/libc/compilers/common/readme.md
new file mode 100644
index 0000000000..cb91d95f45
--- /dev/null
+++ b/components/libc/compilers/common/readme.md
@@ -0,0 +1 @@
+This folder is "common" for armlibc newlibc and dlib. It's not "common" for minilibc.
\ No newline at end of file
diff --git a/components/libc/compilers/common/sys/time.h b/components/libc/compilers/common/sys/time.h
index 1d68eeafa3..22f1c17f5e 100644
--- a/components/libc/compilers/common/sys/time.h
+++ b/components/libc/compilers/common/sys/time.h
@@ -5,6 +5,7 @@
  *
  * Change Logs:
  * Date           Author       Notes
+ * 2020-09-07     Meco Man     combine gcc armcc iccarm
  */
 #ifndef _SYS_TIME_H_
 #define _SYS_TIME_H_
@@ -15,6 +16,14 @@
 extern "C" {
 #endif
 
+/*
+ * Skip define timespec for IAR version over 8.10.1 where __VER__ is 8010001.
+ */
+#if defined ( __ICCARM__ ) && (__VER__ >= 8010001)
+#define _TIMESPEC_DEFINED
+#endif
+
+
 #ifndef _TIMEVAL_DEFINED
 #define _TIMEVAL_DEFINED
 /*
@@ -27,23 +36,6 @@ struct timeval {
 };
 #endif /* _TIMEVAL_DEFINED */
 
-/*
- * Skip define timespec for IAR version over 8.10.1 where __VER__ is 8010001.
- */
-#if defined ( __ICCARM__ ) && (__VER__ >= 8010001)
-#define _TIMESPEC_DEFINED
-#endif
-
-#ifndef _TIMESPEC_DEFINED
-#define _TIMESPEC_DEFINED
-/*
- * Structure defined by POSIX.1b to be like a timeval.
- */
-struct timespec {
-    time_t  tv_sec;     /* seconds */
-    long    tv_nsec;    /* and nanoseconds */
-};
-#endif /* _TIMESPEC_DEFINED */ 
 
 struct timezone {
   int tz_minuteswest;   /* minutes west of Greenwich */
diff --git a/components/libc/compilers/armlibc/termios.h b/components/libc/compilers/common/termios.h
similarity index 87%
rename from components/libc/compilers/armlibc/termios.h
rename to components/libc/compilers/common/termios.h
index 1956121225..ee2b4d5718 100644
--- a/components/libc/compilers/armlibc/termios.h
+++ b/components/libc/compilers/common/termios.h
@@ -9,7 +9,9 @@
 #ifndef _TERMIOS_H__
 #define _TERMIOS_H__
 
+#ifdef RT_USING_POSIX_TERMIOS
 #include <sys/types.h>
 #include <posix_termios.h>
+#endif
 
 #endif
diff --git a/components/libc/compilers/common/time.c b/components/libc/compilers/common/time.c
index 50a800b259..99dab71eb4 100644
--- a/components/libc/compilers/common/time.c
+++ b/components/libc/compilers/common/time.c
@@ -6,6 +6,7 @@
  * Change Logs:
  * Date           Author       Notes
  * 2019-08-21     zhangjun     copy from minilibc
+ * 2020-09-07     Meco Man     combine gcc armcc iccarm
  */
 
 #include <sys/time.h>
diff --git a/components/libc/compilers/common/unistd.c b/components/libc/compilers/common/unistd.c
index 04a0886655..4068fc5cf5 100644
--- a/components/libc/compilers/common/unistd.c
+++ b/components/libc/compilers/common/unistd.c
@@ -8,10 +8,11 @@
  * 2020-09-01     Meco Man     First Version
  */
 
-#include <termios.h>
 #include <unistd.h>
 
 #ifdef RT_USING_POSIX_TERMIOS
+#include <termios.h>
+
 int isatty(int fd)
 {
     struct termios ts;
diff --git a/components/libc/compilers/dlib/termios.h b/components/libc/compilers/dlib/termios.h
deleted file mode 100644
index 1956121225..0000000000
--- a/components/libc/compilers/dlib/termios.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
-#ifndef _TERMIOS_H__
-#define _TERMIOS_H__
-
-#include <sys/types.h>
-#include <posix_termios.h>
-
-#endif
diff --git a/components/libc/compilers/minilibc/SConscript b/components/libc/compilers/minilibc/SConscript
index 518d800571..dec657028f 100644
--- a/components/libc/compilers/minilibc/SConscript
+++ b/components/libc/compilers/minilibc/SConscript
@@ -8,7 +8,7 @@ group = []
 CPPPATH = [cwd]
 CPPDEFINES = ['RT_USING_MINILIBC']
 
-if rtconfig.PLATFORM == 'gcc' and rtconfig.ARCH != 'sim' and not GetDepend('RT_USING_LIBC'):
+if rtconfig.PLATFORM == 'gcc' and rtconfig.ARCH != 'sim' and not GetDepend('RT_USING_LIBC') and GetDepend('RT_USING_MINILIBC'):
     group = DefineGroup('libc', src, depend = [''],
         CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
 
diff --git a/components/libc/compilers/newlib/termios.h b/components/libc/compilers/newlib/termios.h
deleted file mode 100644
index 1956121225..0000000000
--- a/components/libc/compilers/newlib/termios.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
-#ifndef _TERMIOS_H__
-#define _TERMIOS_H__
-
-#include <sys/types.h>
-#include <posix_termios.h>
-
-#endif
diff --git a/components/libc/compilers/newlib/time.c b/components/libc/compilers/newlib/time.c
deleted file mode 100644
index f099d51330..0000000000
--- a/components/libc/compilers/newlib/time.c
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
-#include <sys/time.h>
-#include <rtthread.h>
-
-#ifdef RT_USING_DEVICE
-int gettimeofday(struct timeval *tp, void *ignore)
-{
-    time_t time;
-    rt_device_t device;
-
-    device = rt_device_find("rtc");
-    RT_ASSERT(device != RT_NULL);
-
-    rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
-    if (tp != RT_NULL)
-    {
-        tp->tv_sec = time;
-        tp->tv_usec = 0;
-    }
-
-    return time;
-}
-#endif
-
-/**
- * Returns the current time.
- *
- * @param time_t * t the timestamp pointer, if not used, keep NULL.
- *
- * @return time_t return timestamp current.
- *
- */
-/* for IAR 6.2 later Compiler */
-#if defined (__IAR_SYSTEMS_ICC__) &&  (__VER__) >= 6020000
-#pragma module_name = "?time"
-time_t (__time32)(time_t *t) /* Only supports 32-bit timestamp */
-#else
-time_t time(time_t *t)
-#endif
-{
-    time_t time_now = 0;
-
-#ifdef RT_USING_RTC
-    static rt_device_t device = RT_NULL;
-
-    /* optimization: find rtc device only first. */
-    if (device == RT_NULL)
-    {
-        device = rt_device_find("rtc");
-    }
-
-    /* read timestamp from RTC device. */
-    if (device != RT_NULL)
-    {
-        if (rt_device_open(device, 0) == RT_EOK)
-        {
-            rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time_now);
-            rt_device_close(device);
-        }
-    }
-#endif /* RT_USING_RTC */
-
-    /* if t is not NULL, write timestamp to *t */
-    if (t != RT_NULL)
-    {
-        *t = time_now;
-    }
-
-    return time_now;
-}
-
-RT_WEAK clock_t clock(void)
-{
-    return rt_tick_get();
-}
diff --git a/components/libc/getline/README.md b/components/libc/getline/README.md
new file mode 100644
index 0000000000..3ba5a96b3d
--- /dev/null
+++ b/components/libc/getline/README.md
@@ -0,0 +1,30 @@
+# getline/getdelim for RT-Thread POSIX(IEEE Std 1003.1-2008)
+
+[![Build Status](https://travis-ci.org/ivanrad/getline.svg?branch=master)](https://travis-ci.org/ivanrad/getline)
+
+https://github.com/ivanrad/getline
+
+Read a delimited record from stream.
+
+Yet another (hopefully portable C) implementation of getline/getdelim.
+These are ersatz functions, a drop-in replacement, to be used on those occasions when your C library does not already support them.
+
+For more details, see [Open Group Base Specification for getdelim/getline][opengroup-spec].
+
+## Building the project
+
+Just run `make`.
+
+## License
+
+This code is unlicensed -- free and released into the public domain. See `UNLICENSE` file for more information.
+
+[opengroup-spec]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/getline.html
+
+
+## 联系&维护
+Meco Man 
+
+jiantingman@foxmail.com
+
+https://github.com/mysterywolf/getline
diff --git a/components/libc/getline/SConscript b/components/libc/getline/SConscript
new file mode 100644
index 0000000000..fa4c8618c1
--- /dev/null
+++ b/components/libc/getline/SConscript
@@ -0,0 +1,13 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c') + Glob('*.cpp')
+CPPPATH = [cwd]
+
+group = DefineGroup('libc', src, 
+    depend = ['RT_USING_LIBC', 'RT_USING_POSIX','RT_USING_POSIX_GETLINE'], 
+    CPPPATH = CPPPATH)
+
+Return('group')
diff --git a/components/libc/getline/UNLICENSE b/components/libc/getline/UNLICENSE
new file mode 100644
index 0000000000..68a49daad8
--- /dev/null
+++ b/components/libc/getline/UNLICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>
diff --git a/components/libc/getline/posix_getline.c b/components/libc/getline/posix_getline.c
new file mode 100644
index 0000000000..2c60ca7647
--- /dev/null
+++ b/components/libc/getline/posix_getline.c
@@ -0,0 +1,79 @@
+/* posix_getline.c
+ * RT-Thread POSIX
+ * getdelim(), getline() - read a delimited record from stream, ersatz implementation
+ * This code is unlicensed -- free and released into the public domain. 
+ * https://man7.org/linux/man-pages/man3/getline.3.html
+ * Authors:
+ *     https://github.com/ivanrad/getline
+ *     https://github.com/mysterywolf/getline/
+ * 
+ * Meco Man    2020-09-03    First Version
+ */
+
+#include <posix_getline.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <rtlibc.h>
+
+ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream) {
+    char *cur_pos, *new_lineptr;
+    size_t new_lineptr_len;
+    int c;
+
+    if (lineptr == NULL || n == NULL || stream == NULL) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (*lineptr == NULL) {
+        *n = 128; /* init len */
+        if ((*lineptr = (char *)malloc(*n)) == NULL) {
+            errno = ENOMEM;
+            return -1;
+        }
+    }
+
+    cur_pos = *lineptr;
+    for (;;) {
+        c = getc(stream);
+
+        if (ferror(stream) || (c == EOF && cur_pos == *lineptr))
+            return -1;
+
+        if (c == EOF)
+            break;
+
+        if ((*lineptr + *n - cur_pos) < 2) {
+            if (SSIZE_MAX / 2 < *n) {
+#ifdef EOVERFLOW
+                errno = EOVERFLOW;
+#else
+                errno = ERANGE; /* no EOVERFLOW defined */
+#endif
+                return -1;
+            }
+            new_lineptr_len = *n * 2;
+
+            if ((new_lineptr = (char *)realloc(*lineptr, new_lineptr_len)) == NULL) {
+                errno = ENOMEM;
+                return -1;
+            }
+            cur_pos = new_lineptr + (cur_pos - *lineptr);
+            *lineptr = new_lineptr;
+            *n = new_lineptr_len;
+        }
+
+        *cur_pos++ = (char)c;
+
+        if (c == delim)
+            break;
+    }
+
+    *cur_pos = '\0';
+    return (ssize_t)(cur_pos - *lineptr);
+}
+
+ssize_t getline(char **lineptr, size_t *n, FILE *stream) {
+    return getdelim(lineptr, n, '\n', stream);
+}
+
diff --git a/components/libc/getline/posix_getline.h b/components/libc/getline/posix_getline.h
new file mode 100644
index 0000000000..c7d6021af3
--- /dev/null
+++ b/components/libc/getline/posix_getline.h
@@ -0,0 +1,24 @@
+/* posix_getline.h
+ * RT-Thread POSIX
+ * getdelim(), getline() - read a delimited record from stream, ersatz implementation
+ * This code is unlicensed -- free and released into the public domain. 
+ * https://man7.org/linux/man-pages/man3/getline.3.html
+ * Authors:
+ *     https://github.com/ivanrad/getline
+ *     https://github.com/mysterywolf/getline/
+ *
+ * Meco Man    2020-09-03    First Version
+ */
+
+
+#ifndef POSIX_GETLINE_H
+#define POSIX_GETLINE_H
+
+#include <stdio.h>
+#include <sys/types.h>
+
+ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
+ssize_t getline(char **lineptr, size_t *n, FILE *stream);
+
+#endif /* POSIX_GETLINE_H */
+
diff --git a/components/net/lwip-1.4.1/src/arch/include/arch/cc.h b/components/net/lwip-1.4.1/src/arch/include/arch/cc.h
index 5304091755..604477dab8 100644
--- a/components/net/lwip-1.4.1/src/arch/include/arch/cc.h
+++ b/components/net/lwip-1.4.1/src/arch/include/arch/cc.h
@@ -66,7 +66,7 @@ typedef uintptr_t mem_ptr_t;
 #endif /* __CC_ARM/__IAR_SYSTEMS_ICC__ */
 #endif
 
-#if defined(RT_USING_LIBC) || defined(RT_USING_MINILIBC) || defined(RT_LIBC_USING_TIME)
+#if defined(RT_USING_LIBC) || defined(RT_USING_MINILIBC) || defined(RT_LIBC_USING_TIME) || defined ( __GNUC__)
 #include <sys/time.h>
 #define LWIP_TIMEVAL_PRIVATE	   0
 #else
diff --git a/components/net/lwip-2.0.2/src/arch/include/arch/cc.h b/components/net/lwip-2.0.2/src/arch/include/arch/cc.h
index 491cab6b5f..00536a8419 100644
--- a/components/net/lwip-2.0.2/src/arch/include/arch/cc.h
+++ b/components/net/lwip-2.0.2/src/arch/include/arch/cc.h
@@ -45,7 +45,7 @@
 #define S32_F "ld"
 #define X32_F "lx"
 
-#if defined(RT_USING_LIBC) || defined(RT_USING_MINILIBC) || defined(RT_LIBC_USING_TIME)
+#if defined(RT_USING_LIBC) || defined(RT_USING_MINILIBC) || defined(RT_LIBC_USING_TIME) || defined ( __GNUC__)
 #include <sys/time.h>
 #define LWIP_TIMEVAL_PRIVATE	   0
 #else
diff --git a/components/net/lwip-2.1.2/src/arch/include/arch/cc.h b/components/net/lwip-2.1.2/src/arch/include/arch/cc.h
index c1b4cf7d29..6905ecd442 100644
--- a/components/net/lwip-2.1.2/src/arch/include/arch/cc.h
+++ b/components/net/lwip-2.1.2/src/arch/include/arch/cc.h
@@ -59,7 +59,7 @@
 #endif /* __CC_ARM/__IAR_SYSTEMS_ICC__ */
 #endif /* RT_USING_LIBC */
 
-#if defined(RT_USING_LIBC) || defined(RT_USING_MINILIBC) || defined(RT_LIBC_USING_TIME)
+#if defined(RT_USING_LIBC) || defined(RT_USING_MINILIBC) || defined(RT_LIBC_USING_TIME) || defined ( __GNUC__)
 #include <sys/time.h>
 #define LWIP_TIMEVAL_PRIVATE	   0
 #else
diff --git a/include/libc/libc_errno.h b/include/libc/libc_errno.h
index 0f3bc7635a..00c1f733d3 100644
--- a/include/libc/libc_errno.h
+++ b/include/libc/libc_errno.h
@@ -13,7 +13,7 @@
 
 #include <rtconfig.h>
 
-#if defined(RT_USING_NEWLIB) || defined(_WIN32)
+#if defined(RT_USING_NEWLIB) || defined(_WIN32) || defined( __GNUC__ )
 /* use errno.h file in toolchains */
 #include <errno.h>
 #endif
@@ -45,7 +45,7 @@ defined in armcc/errno.h
 #define ERROR_BASE_NO    0
 #endif
 
-#if !defined(RT_USING_NEWLIB) && !defined(_WIN32)
+#if !defined(RT_USING_NEWLIB) && !defined(_WIN32) && !defined(__GNUC__ )
 
 #define EPERM            (ERROR_BASE_NO + 1)
 #define ENOENT           (ERROR_BASE_NO + 2)
diff --git a/include/libc/libc_fcntl.h b/include/libc/libc_fcntl.h
index 1b7c69b1f4..39740b7d85 100644
--- a/include/libc/libc_fcntl.h
+++ b/include/libc/libc_fcntl.h
@@ -2,10 +2,6 @@
  * Copyright (c) 2006-2018, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
- */
-
-/*
- * File      : libc_fcntl.h
  *
  * Change Logs:
  * Date           Author       Notes
@@ -16,7 +12,7 @@
 #ifndef LIBC_FCNTL_H__
 #define LIBC_FCNTL_H__
 
-#if defined(RT_USING_NEWLIB) || defined(_WIN32)
+#if defined(RT_USING_NEWLIB) || defined(_WIN32) || defined( __GNUC__ )
 #include <fcntl.h>
 
 #ifndef O_NONBLOCK
diff --git a/include/libc/libc_fdset.h b/include/libc/libc_fdset.h
index ecd965cd22..4a778b51c1 100644
--- a/include/libc/libc_fdset.h
+++ b/include/libc/libc_fdset.h
@@ -2,10 +2,6 @@
  * Copyright (c) 2006-2018, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
- */
-
-/*
- * File      : libc_errno.h
  *
  * Change Logs:
  * Date           Author       Notes
@@ -17,7 +13,7 @@
 
 #include <rtconfig.h>
 
-#if defined(RT_USING_NEWLIB) || defined(_WIN32)
+#if defined(RT_USING_NEWLIB) || defined(_WIN32) || defined( __GNUC__ )
 #include <sys/types.h>
 #if defined(HAVE_SYS_SELECT_H)
 #include <sys/select.h>
diff --git a/include/libc/libc_ioctl.h b/include/libc/libc_ioctl.h
index ef5a5257a8..42a21a2cea 100644
--- a/include/libc/libc_ioctl.h
+++ b/include/libc/libc_ioctl.h
@@ -2,10 +2,6 @@
  * Copyright (c) 2006-2018, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
- */
-
-/*
- * File      : libc_ioctl.h
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/include/libc/libc_limits.h b/include/libc/libc_limits.h
new file mode 100644
index 0000000000..b8368160df
--- /dev/null
+++ b/include/libc/libc_limits.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date                 Author             Notes
+ * 2020-09-05     Meco Manthe  first version
+ */
+
+#ifndef LIBC_LIMITS_H__
+#define LIBC_LIMITS_H__
+
+#include <limits.h>
+#include <rtconfig.h>
+
+#ifdef RT_USING_POSIX
+
+#ifndef SSIZE_MAX
+# define SSIZE_MAX      LONG_MAX
+#endif
+
+#endif
+
+#endif
diff --git a/include/libc/libc_signal.h b/include/libc/libc_signal.h
index 898fe13f43..539685de3e 100644
--- a/include/libc/libc_signal.h
+++ b/include/libc/libc_signal.h
@@ -15,6 +15,7 @@
 extern "C" {
 #endif
 
+#include <stdint.h>
 #ifdef HAVE_CCONFIG_H
 #include <cconfig.h>
 #endif
@@ -46,8 +47,8 @@ struct sigevent
 #ifndef HAVE_SIGINFO
 struct siginfo
 {
-    rt_uint16_t si_signo;
-    rt_uint16_t si_code;
+    uint16_t si_signo;
+    uint16_t si_code;
 
     union sigval si_value;
 };
diff --git a/include/libc/libc_stat.h b/include/libc/libc_stat.h
index 9079d1ef15..9388688572 100644
--- a/include/libc/libc_stat.h
+++ b/include/libc/libc_stat.h
@@ -9,7 +9,7 @@
 
 #include <rtconfig.h>
 
-#if defined(RT_USING_NEWLIB)
+#if defined(RT_USING_NEWLIB) || defined( __GNUC__ )
 /* use header file of newlib */
 #include <sys/stat.h>
 
diff --git a/include/libc/libc_stdio.h b/include/libc/libc_stdio.h
new file mode 100644
index 0000000000..85ba509852
--- /dev/null
+++ b/include/libc/libc_stdio.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date                 Author             Notes
+ * 2020-09-05     Meco Manthe  first version
+ */
+
+#ifndef LIBC_STDIO_H__
+#define LIBC_STDIO_H__
+
+#include <rtconfig.h>
+
+#ifdef RT_USING_POSIX_GETLINE
+
+#include <posix_getline.h>
+
+#endif
+
+#endif
diff --git a/include/rtlibc.h b/include/rtlibc.h
index b3a548beb1..fb8c782095 100644
--- a/include/rtlibc.h
+++ b/include/rtlibc.h
@@ -20,6 +20,8 @@
 #include "libc/libc_dirent.h"
 #include "libc/libc_signal.h"
 #include "libc/libc_fdset.h"
+#include "libc/libc_limits.h"
+#include "libc/libc_stdio.h"
 
 #if defined(__CC_ARM) || defined(__CLANG_ARM) || defined(__IAR_SYSTEMS_ICC__)
 typedef signed long off_t;