[Kernel] header files

1. Remove components.h file;
2. Add libc_* files for standard libc definitions;
3. Add rtdbg.h file for simple debug log;
4. Add single list implementation;
5. Change the 'rt_uint8_t' type of cmd to 'int'.

12 files changed, 1037 insertions, 95 deletions

diff --git a/include/components.h b/include/components.h
deleted file mode 100644
index 57c0c02616..0000000000
--- a/include/components.h
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * File      : components.h
- *             header for RT-Thread components
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2012-2015, RT-Thread Development Team
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Change Logs:
- * Date           Author       Notes
- * 2012-09-20     Bernard      Change the name to components.h
- *                             And all components related header files.
- * 2015-02-06     Bernard      Rename the components.h to rtcom.h
- * 2015-03-22     Bernard      Keep the compatibility.
- */
-
-#ifndef COMPONENTS_H__
-#define COMPONENTS_H__
-
-#ifdef RT_USING_FINSH
-#include <finsh.h>
-#include <shell.h>
-#endif
-
-#ifdef RT_USING_LWIP
-#include <lwip/sys.h>
-#include <netif/ethernetif.h>
-#endif
-
-#ifdef RT_USING_DFS
-#include <dfs_init.h>
-#include <dfs_fs.h>
-#ifdef RT_USING_DFS_ELMFAT
-#include <dfs_elm.h>
-#endif
-#if defined(RT_USING_LWIP) && defined(RT_USING_DFS_NFS)
-#include <dfs_nfs.h>
-#endif
-#ifdef RT_USING_DFS_ROMFS
-#include <dfs_romfs.h>
-#endif
-#ifdef RT_USING_DFS_DEVFS
-#include <devfs.h>
-#endif
-#ifdef RT_USING_DFS_UFFS
-#include <dfs_uffs.h>
-#endif
-#ifdef RT_USING_DFS_JFFS2
-#include <dfs_jffs2.h>
-#endif
-#ifdef RT_USING_DFS_YAFFS2
-#include <dfs_yaffs2.h>
-#endif
-#ifdef RT_USING_DFS_RAMFS
-#include <dfs_ramfs.h>
-#endif
-#endif
-
-#ifdef RT_USING_PTHREADS
-#include <pthread.h>
-#endif
-
-#ifdef RT_USING_MODULE
-#include <rtm.h>
-#endif
-
-#endif
diff --git a/include/libc/libc_dirent.h b/include/libc/libc_dirent.h
new file mode 100644
index 0000000000..5bcbc32478
--- /dev/null
+++ b/include/libc/libc_dirent.h
@@ -0,0 +1,8 @@
+#ifndef LIBC_DIRENT_H__
+#define LIBC_DIRENT_H__
+
+#define DT_UNKNOWN           0x00
+#define DT_REG               0x01
+#define DT_DIR               0x02
+
+#endif
diff --git a/include/libc/libc_errno.h b/include/libc/libc_errno.h
new file mode 100644
index 0000000000..7b6f302091
--- /dev/null
+++ b/include/libc/libc_errno.h
@@ -0,0 +1,171 @@
+/*
+ * File      : libc_errno.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2016-11-12     Bernard      The first version
+ */
+
+#ifndef LIBC_ERRNO_H__
+#define LIBC_ERRNO_H__
+
+#include <rtconfig.h>
+
+#ifdef RT_USING_NEWLIB
+/* use errno.h file in newlib */
+#include <errno.h>
+#else
+/* define errno self. */
+#define EPERM            1
+#define ENOENT           2
+#define ESRCH            3
+#define EINTR            4
+#define EIO              5
+#define ENXIO            6
+#define E2BIG            7
+#define ENOEXEC          8
+#define EBADF            9
+#define ECHILD          10
+#define EAGAIN          11
+#define ENOMEM          12
+#define EACCES          13
+#define EFAULT          14
+#define ENOTBLK         15
+#define EBUSY           16
+#define EEXIST          17
+#define EXDEV           18
+#define ENODEV          19
+#define ENOTDIR         20
+#define EISDIR          21
+#define EINVAL          22
+#define ENFILE          23
+#define EMFILE          24
+#define ENOTTY          25
+#define ETXTBSY         26
+#define EFBIG           27
+#define ENOSPC          28
+#define ESPIPE          29
+#define EROFS           30
+#define EMLINK          31
+#define EPIPE           32
+#define EDOM            33
+#define ERANGE          34
+#define EDEADLK         35
+#define ENAMETOOLONG    36
+#define ENOLCK          37
+#define ENOSYS          38
+#define ENOTEMPTY       39
+#define ELOOP           40
+#define EWOULDBLOCK     EAGAIN
+#define ENOMSG          42
+#define EIDRM           43
+#define ECHRNG          44
+#define EL2NSYNC        45
+#define EL3HLT          46
+#define EL3RST          47
+#define ELNRNG          48
+#define EUNATCH         49
+#define ENOCSI          50
+#define EL2HLT          51
+#define EBADE           52
+#define EBADR           53
+#define EXFULL          54
+#define ENOANO          55
+#define EBADRQC         56
+#define EBADSLT         57
+#define EDEADLOCK       EDEADLK
+#define EBFONT          59
+#define ENOSTR          60
+#define ENODATA         61
+#define ETIME           62
+#define ENOSR           63
+#define ENONET          64
+#define ENOPKG          65
+#define EREMOTE         66
+#define ENOLINK         67
+#define EADV            68
+#define ESRMNT          69
+#define ECOMM           70
+#define EPROTO          71
+#define EMULTIHOP       72
+#define EDOTDOT         73
+#define EBADMSG         74
+#define EOVERFLOW       75
+#define ENOTUNIQ        76
+#define EBADFD          77
+#define EREMCHG         78
+#define ELIBACC         79
+#define ELIBBAD         80
+#define ELIBSCN         81
+#define ELIBMAX         82
+#define ELIBEXEC        83
+#define EILSEQ          84
+#define ERESTART        85
+#define ESTRPIPE        86
+#define EUSERS          87
+#define ENOTSOCK        88
+#define EDESTADDRREQ    89
+#define EMSGSIZE        90
+#define EPROTOTYPE      91
+#define ENOPROTOOPT     92
+#define EPROTONOSUPPORT 93
+#define ESOCKTNOSUPPORT 94
+#define EOPNOTSUPP      95
+#define ENOTSUP         EOPNOTSUPP
+#define EPFNOSUPPORT    96
+#define EAFNOSUPPORT    97
+#define EADDRINUSE      98
+#define EADDRNOTAVAIL   99
+#define ENETDOWN        100
+#define ENETUNREACH     101
+#define ENETRESET       102
+#define ECONNABORTED    103
+#define ECONNRESET      104
+#define ENOBUFS         105
+#define EISCONN         106
+#define ENOTCONN        107
+#define ESHUTDOWN       108
+#define ETOOMANYREFS    109
+#define ETIMEDOUT       110
+#define ECONNREFUSED    111
+#define EHOSTDOWN       112
+#define EHOSTUNREACH    113
+#define EALREADY        114
+#define EINPROGRESS     115
+#define ESTALE          116
+#define EUCLEAN         117
+#define ENOTNAM         118
+#define ENAVAIL         119
+#define EISNAM          120
+#define EREMOTEIO       121
+#define EDQUOT          122
+#define ENOMEDIUM       123
+#define EMEDIUMTYPE     124
+#define ECANCELED       125
+#define ENOKEY          126
+#define EKEYEXPIRED     127
+#define EKEYREVOKED     128
+#define EKEYREJECTED    129
+#define EOWNERDEAD      130
+#define ENOTRECOVERABLE 131
+#define ERFKILL         132
+#define EHWPOISON       133
+#endif
+
+#endif
diff --git a/include/libc/libc_fcntl.h b/include/libc/libc_fcntl.h
new file mode 100644
index 0000000000..342e4ef5ce
--- /dev/null
+++ b/include/libc/libc_fcntl.h
@@ -0,0 +1,57 @@
+/*
+ * fcntl.h file in libc
+ */ 
+#ifndef LIBC_FCNTL_H__
+#define LIBC_FCNTL_H__
+
+#define O_RDONLY         00
+#define O_WRONLY         01
+#define O_RDWR           02
+
+#define O_CREAT        0100
+#define O_EXCL         0200
+#define O_NOCTTY       0400
+#define O_TRUNC       01000
+#define O_APPEND      02000
+#define O_NONBLOCK    04000
+#define O_DSYNC      010000
+#define O_SYNC     04010000
+#define O_RSYNC    04010000
+#define O_DIRECTORY 0200000
+#define O_NOFOLLOW  0400000
+#define O_CLOEXEC  02000000
+
+#define O_ASYNC      020000
+#define O_DIRECT     040000
+#define O_LARGEFILE 0100000
+#define O_NOATIME  01000000
+#define O_PATH    010000000
+#define O_TMPFILE 020200000
+#define O_NDELAY O_NONBLOCK
+
+#define O_SEARCH  O_PATH
+#define O_EXEC    O_PATH
+
+#define O_ACCMODE (03|O_SEARCH)
+
+#define F_DUPFD  0
+#define F_GETFD  1
+#define F_SETFD  2
+#define F_GETFL  3
+#define F_SETFL  4
+
+#define F_SETOWN 8
+#define F_GETOWN 9
+#define F_SETSIG 10
+#define F_GETSIG 11
+
+#define F_GETLK 12
+#define F_SETLK 13
+#define F_SETLKW 14
+
+#define F_SETOWN_EX 15
+#define F_GETOWN_EX 16
+
+#define F_GETOWNER_UIDS 17
+
+#endif
diff --git a/include/libc/libc_ioctl.h b/include/libc/libc_ioctl.h
new file mode 100644
index 0000000000..49191a8548
--- /dev/null
+++ b/include/libc/libc_ioctl.h
@@ -0,0 +1,238 @@
+/*
+ * File      : libc_ioctl.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-01-21     Bernard      the first version
+ */
+
+#ifndef LIBC_IOCTL_H__
+#define LIBC_IOCTL_H__
+
+#define _IOC(a,b,c,d) ( ((a)<<30) | ((b)<<8) | (c) | ((d)<<16) )
+#define _IOC_NONE  0U
+#define _IOC_WRITE 1U
+#define _IOC_READ  2U
+
+#define _IO(a,b)    _IOC(_IOC_NONE,(a),(b),0)
+#define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
+
+#define FIONREAD    _IOR('f', 127, int) /* get # bytes to read */
+#define FIONBIO     _IOW('f', 126, int) /* set/clear non-blocking i/o */
+#define FIONWRITE   _IOR('f', 121, int) /* get # bytes outstanding
+                         * in send queue. */
+
+#define TCGETS		0x5401
+#define TCSETS		0x5402
+#define TCSETSW		0x5403
+#define TCSETSF		0x5404
+#define TCGETA		0x5405
+#define TCSETA		0x5406
+#define TCSETAW		0x5407
+#define TCSETAF		0x5408
+#define TCSBRK		0x5409
+#define TCXONC		0x540A
+#define TCFLSH		0x540B
+#define TIOCEXCL	0x540C
+#define TIOCNXCL	0x540D
+#define TIOCSCTTY	0x540E
+#define TIOCGPGRP	0x540F
+#define TIOCSPGRP	0x5410
+#define TIOCOUTQ	0x5411
+#define TIOCSTI		0x5412
+#define TIOCGWINSZ	0x5413
+#define TIOCSWINSZ	0x5414
+#define TIOCMGET	0x5415
+#define TIOCMBIS	0x5416
+#define TIOCMBIC	0x5417
+#define TIOCMSET	0x5418
+#define TIOCGSOFTCAR	0x5419
+#define TIOCSSOFTCAR	0x541A
+// #define FIONREAD	0x541B
+#define TIOCINQ		FIONREAD
+#define TIOCLINUX	0x541C
+#define TIOCCONS	0x541D
+#define TIOCGSERIAL	0x541E
+#define TIOCSSERIAL	0x541F
+#define TIOCPKT		0x5420
+// #define FIONBIO		0x5421
+#define TIOCNOTTY	0x5422
+#define TIOCSETD	0x5423
+#define TIOCGETD	0x5424
+#define TCSBRKP		0x5425
+#define TIOCSBRK	0x5427
+#define TIOCCBRK	0x5428
+#define TIOCGSID	0x5429
+#define TIOCGRS485	0x542E
+#define TIOCSRS485	0x542F
+#define TIOCGPTN	0x80045430
+#define TIOCSPTLCK	0x40045431
+#define TIOCGDEV	0x80045432
+#define TCGETX		0x5432
+#define TCSETX		0x5433
+#define TCSETXF		0x5434
+#define TCSETXW		0x5435
+#define TIOCSIG		0x40045436
+#define TIOCVHANGUP	0x5437
+#define TIOCGPKT	0x80045438
+#define TIOCGPTLCK	0x80045439
+#define TIOCGEXCL	0x80045440
+
+#define FIONCLEX	0x5450
+#define FIOCLEX		0x5451
+#define FIOASYNC	0x5452
+#define TIOCSERCONFIG	0x5453
+#define TIOCSERGWILD	0x5454
+#define TIOCSERSWILD	0x5455
+#define TIOCGLCKTRMIOS	0x5456
+#define TIOCSLCKTRMIOS	0x5457
+#define TIOCSERGSTRUCT	0x5458
+#define TIOCSERGETLSR   0x5459
+#define TIOCSERGETMULTI 0x545A
+#define TIOCSERSETMULTI 0x545B
+
+#define TIOCMIWAIT	0x545C
+#define TIOCGICOUNT	0x545D
+#define FIOQSIZE	0x5460
+
+#define TIOCPKT_DATA		 0
+#define TIOCPKT_FLUSHREAD	 1
+#define TIOCPKT_FLUSHWRITE	 2
+#define TIOCPKT_STOP		 4
+#define TIOCPKT_START		 8
+#define TIOCPKT_NOSTOP		16
+#define TIOCPKT_DOSTOP		32
+#define TIOCPKT_IOCTL		64
+
+#define TIOCSER_TEMT    0x01
+
+struct winsize {
+	unsigned short ws_row;
+	unsigned short ws_col;
+	unsigned short ws_xpixel;
+	unsigned short ws_ypixel;
+};
+
+#define TIOCM_LE        0x001
+#define TIOCM_DTR       0x002
+#define TIOCM_RTS       0x004
+#define TIOCM_ST        0x008
+#define TIOCM_SR        0x010
+#define TIOCM_CTS       0x020
+#define TIOCM_CAR       0x040
+#define TIOCM_RNG       0x080
+#define TIOCM_DSR       0x100
+#define TIOCM_CD        TIOCM_CAR
+#define TIOCM_RI        TIOCM_RNG
+#define TIOCM_OUT1      0x2000
+#define TIOCM_OUT2      0x4000
+#define TIOCM_LOOP      0x8000
+
+#define N_TTY           0
+#define N_SLIP          1
+#define N_MOUSE         2
+#define N_PPP           3
+#define N_STRIP         4
+#define N_AX25          5
+#define N_X25           6
+#define N_6PACK         7
+#define N_MASC          8
+#define N_R3964         9
+#define N_PROFIBUS_FDL  10
+#define N_IRDA          11
+#define N_SMSBLOCK      12
+#define N_HDLC          13
+#define N_SYNC_PPP      14
+#define N_HCI           15
+
+#define FIOSETOWN       0x8901
+#define SIOCSPGRP       0x8902
+#define FIOGETOWN       0x8903
+#define SIOCGPGRP       0x8904
+// #define SIOCATMARK      0x8905
+#define SIOCGSTAMP      0x8906
+#define SIOCGSTAMPNS    0x8907
+
+#define SIOCADDRT       0x890B
+#define SIOCDELRT       0x890C
+#define SIOCRTMSG       0x890D
+
+#define SIOCGIFNAME     0x8910
+#define SIOCSIFLINK     0x8911
+#define SIOCGIFCONF     0x8912
+#define SIOCGIFFLAGS    0x8913
+#define SIOCSIFFLAGS    0x8914
+#define SIOCGIFADDR     0x8915
+#define SIOCSIFADDR     0x8916
+#define SIOCGIFDSTADDR  0x8917
+#define SIOCSIFDSTADDR  0x8918
+#define SIOCGIFBRDADDR  0x8919
+#define SIOCSIFBRDADDR  0x891a
+#define SIOCGIFNETMASK  0x891b
+#define SIOCSIFNETMASK  0x891c
+#define SIOCGIFMETRIC   0x891d
+#define SIOCSIFMETRIC   0x891e
+#define SIOCGIFMEM      0x891f
+#define SIOCSIFMEM      0x8920
+#define SIOCGIFMTU      0x8921
+#define SIOCSIFMTU      0x8922
+#define SIOCSIFNAME     0x8923
+#define SIOCSIFHWADDR   0x8924
+#define SIOCGIFENCAP    0x8925
+#define SIOCSIFENCAP    0x8926
+#define SIOCGIFHWADDR   0x8927
+#define SIOCGIFSLAVE    0x8929
+#define SIOCSIFSLAVE    0x8930
+#define SIOCADDMULTI    0x8931
+#define SIOCDELMULTI    0x8932
+#define SIOCGIFINDEX    0x8933
+#define SIOGIFINDEX     SIOCGIFINDEX
+#define SIOCSIFPFLAGS   0x8934
+#define SIOCGIFPFLAGS   0x8935
+#define SIOCDIFADDR     0x8936
+#define SIOCSIFHWBROADCAST 0x8937
+#define SIOCGIFCOUNT    0x8938
+
+#define SIOCGIFBR       0x8940
+#define SIOCSIFBR       0x8941
+
+#define SIOCGIFTXQLEN   0x8942
+#define SIOCSIFTXQLEN   0x8943
+
+#define SIOCDARP        0x8953
+#define SIOCGARP        0x8954
+#define SIOCSARP        0x8955
+
+#define SIOCDRARP       0x8960
+#define SIOCGRARP       0x8961
+#define SIOCSRARP       0x8962
+
+#define SIOCGIFMAP      0x8970
+#define SIOCSIFMAP      0x8971
+
+#define SIOCADDDLCI     0x8980
+#define SIOCDELDLCI     0x8981
+
+#define SIOCDEVPRIVATE		0x89F0
+#define SIOCPROTOPRIVATE	0x89E0
+
+#endif
+
diff --git a/include/libc/libc_signal.h b/include/libc/libc_signal.h
new file mode 100644
index 0000000000..759647cdd1
--- /dev/null
+++ b/include/libc/libc_signal.h
@@ -0,0 +1,180 @@
+/*
+ * File      : libc_signal.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-09-12     Bernard      The first version
+ */
+
+#ifndef LIBC_SIGNAL_H__
+#define LIBC_SIGNAL_H__
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+union sigval 
+{
+    int    sival_int;    /* Integer signal value */
+    void  *sival_ptr;    /* Pointer signal value */
+};
+
+struct siginfo
+{
+    rt_uint8_t si_signo;
+    rt_uint8_t si_code;
+    rt_int16_t si_errno;
+
+    union sigval si_value;
+};
+typedef struct siginfo siginfo_t;
+
+#define SI_USER 	0x01 	/* Signal sent by kill(). */
+#define SI_QUEUE 	0x02 	/* Signal sent by sigqueue(). */
+#define SI_TIMER	0x03    /* Signal generated by expiration of a 
+                               timer set by timer_settime(). */
+#define SI_ASYNCIO	0x04    /* Signal generated by completion of an 
+							   asynchronous I/O request. */
+#define SI_MESGQ	0x05    /* Signal generated by arrival of a 
+                               message on an empty message queue. */
+
+#ifdef RT_USING_NEWLIB
+#include <sys/signal.h>
+#endif
+
+#ifdef __CC_ARM
+#include <signal.h>
+typedef unsigned long sigset_t;
+
+#define SIGHUP       1
+// #define SIGINT       2
+#define SIGQUIT      3
+// #define SIGILL       4
+#define SIGTRAP      5
+// #define SIGABRT      6
+#define SIGEMT       7
+// #define SIGFPE       8
+#define SIGKILL      9
+#define SIGBUS      10
+// #define SIGSEGV     11
+#define SIGSYS      12
+#define SIGPIPE     13
+#define SIGALRM     14
+// #define SIGTERM     15
+#define SIGURG      16
+#define SIGSTOP     17
+#define SIGTSTP     18
+#define SIGCONT     19
+#define SIGCHLD     20
+#define SIGTTIN     21
+#define SIGTTOU     22
+#define SIGPOLL     23
+#define SIGWINCH    24
+// #define SIGUSR1     25
+// #define SIGUSR2     26
+#define SIGRTMIN    27
+#define SIGRTMAX    31
+#define NSIG        32
+
+#define SIG_SETMASK 0	/* set mask with sigprocmask() */
+#define SIG_BLOCK 	1	/* set of signals to block */
+#define SIG_UNBLOCK 2	/* set of signals to, well, unblock */
+
+typedef void (*_sig_func_ptr)(int);
+
+struct sigaction 
+{
+	_sig_func_ptr sa_handler;
+	sigset_t sa_mask;
+	int sa_flags;
+};
+
+#define sigaddset(what,sig) (*(what) |= (1<<(sig)), 0)
+#define sigdelset(what,sig) (*(what) &= ~(1<<(sig)), 0)
+#define sigemptyset(what)   (*(what) = 0, 0)
+#define sigfillset(what)    (*(what) = ~(0), 0)
+#define sigismember(what,sig) (((*(what)) & (1<<(sig))) != 0)
+
+int sigprocmask (int how, const sigset_t *set, sigset_t *oset);
+int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
+
+#elif defined(__IAR_SYSTEMS_ICC__)
+#include <signal.h>
+typedef unsigned long sigset_t;
+
+#define SIGHUP       1
+#define SIGINT       2
+#define SIGQUIT      3
+#define SIGILL       4
+#define SIGTRAP      5
+// #define SIGABRT      6
+#define SIGEMT       7
+#define SIGFPE       8
+#define SIGKILL      9
+#define SIGBUS      10
+#define SIGSEGV     11
+#define SIGSYS      12
+#define SIGPIPE     13
+#define SIGALRM     14
+#define SIGTERM     15
+#define SIGURG      16
+#define SIGSTOP     17
+#define SIGTSTP     18
+#define SIGCONT     19
+#define SIGCHLD     20
+#define SIGTTIN     21
+#define SIGTTOU     22
+#define SIGPOLL     23
+#define SIGWINCH    24
+#define SIGUSR1     25
+#define SIGUSR2     26
+#define SIGRTMIN    27
+#define SIGRTMAX    31
+#define NSIG        32
+
+#define SIG_SETMASK 0	/* set mask with sigprocmask() */
+#define SIG_BLOCK 	1	/* set of signals to block */
+#define SIG_UNBLOCK 2	/* set of signals to, well, unblock */
+
+typedef void (*_sig_func_ptr)(int);
+
+struct sigaction 
+{
+	_sig_func_ptr sa_handler;
+	sigset_t sa_mask;
+	int sa_flags;
+};
+
+#define sigaddset(what,sig) (*(what) |= (1<<(sig)), 0)
+#define sigdelset(what,sig) (*(what) &= ~(1<<(sig)), 0)
+#define sigemptyset(what)   (*(what) = 0, 0)
+#define sigfillset(what)    (*(what) = ~(0), 0)
+#define sigismember(what,sig) (((*(what)) & (1<<(sig))) != 0)
+
+int sigprocmask (int how, const sigset_t *set, sigset_t *oset);
+int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
diff --git a/include/libc/libc_stat.h b/include/libc/libc_stat.h
new file mode 100644
index 0000000000..1622bedd84
--- /dev/null
+++ b/include/libc/libc_stat.h
@@ -0,0 +1,40 @@
+#ifndef LIBC_STAT_H__
+#define LIBC_STAT_H__
+
+#define S_IFMT               00170000
+#define S_IFSOCK             0140000
+#define S_IFLNK              0120000
+#define S_IFREG              0100000
+#define S_IFBLK              0060000
+#define S_IFDIR              0040000
+#define S_IFCHR              0020000
+#define S_IFIFO              0010000
+#define S_ISUID              0004000
+#define S_ISGID              0002000
+#define S_ISVTX              0001000
+
+#define S_ISLNK(m)           (((m) & S_IFMT) == S_IFLNK)
+#define S_ISREG(m)           (((m) & S_IFMT) == S_IFREG)
+#define S_ISDIR(m)           (((m) & S_IFMT) == S_IFDIR)
+#define S_ISCHR(m)           (((m) & S_IFMT) == S_IFCHR)
+#define S_ISBLK(m)           (((m) & S_IFMT) == S_IFBLK)
+#define S_ISFIFO(m)          (((m) & S_IFMT) == S_IFIFO)
+#define S_ISSOCK(m)          (((m) & S_IFMT) == S_IFSOCK)
+
+#define S_IRWXU              00700
+#define S_IRUSR              00400
+#define S_IWUSR              00200
+#define S_IXUSR              00100
+
+#define S_IRWXG              00070
+#define S_IRGRP              00040
+#define S_IWGRP              00020
+#define S_IXGRP              00010
+
+#define S_IRWXO              00007
+#define S_IROTH              00004
+#define S_IWOTH              00002
+#define S_IXOTH              00001
+
+#endif
+
diff --git a/include/rtdbg.h b/include/rtdbg.h
new file mode 100644
index 0000000000..637390a1cd
--- /dev/null
+++ b/include/rtdbg.h
@@ -0,0 +1,131 @@
+/*
+ * File      : rtdbg.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2016, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2016-11-12     Bernard      The first version
+ */
+
+/*
+ * The macro definitions for debug
+ *
+ * These macros are defined in static. If you want to use debug macro, you can
+ * use as following code:
+ *
+ * In your C/C++ file, enable/disable DEBUG_ENABLE macro, and then include this
+ * header file.
+ *
+ * #define DBG_SECTION_NAME    "[ MOD]"
+ * #define DEBUG_ENABLE     // enable debug macro
+ * #define DEBUG_LEVEL      DBG_INFO
+ * #include <rtdbg.h>       // must after of DEBUG_ENABLE or some other options
+ *
+ * Then in your C/C++ file, you can use dbg_log macro to print out logs:
+ * dbg_log(DBG_INFO, "this is a log!\n");
+ *
+ * Or if you want to use different color for different kinds log, you can
+ * #define DEBUG_COLOR
+ */
+
+#ifndef RT_DBG_H__
+#define RT_DBG_H__
+
+#include <rtconfig.h>
+
+/* DEBUG level */
+#define DBG_LOG             0
+#define DBG_INFO            1
+#define DBG_WARNING         2
+#define DBG_ERROR           3
+
+#ifndef DBG_SECTION_NAME
+#define DBG_SECTION_NAME    "[ DBG]"
+#endif
+
+#ifdef DBG_ENABLE
+
+#ifndef DBG_LEVEL
+#define DBG_LEVEL         DBG_WARNING
+#endif
+
+/*
+ * The color for terminal (foreground)
+ * BLACK    30
+ * RED      31
+ * GREEN    32
+ * YELLOW   33
+ * BLUE     34
+ * PURPLE   35
+ * CYAN     36
+ * WHITE    37
+ */
+#ifdef DBG_COLOR
+#define _DBG_COLOR(n)       rt_kprintf("\033["#n"m")
+#else
+#define _DBG_COLOR(n)
+#endif
+
+/*
+ * static debug routine
+ */
+#define dbg_log(level, fmt, ...)                            \
+    if ((level) >= DBG_LEVEL)                               \
+    {                                                       \
+        switch(level)                                       \
+        {                                                   \
+            case DBG_ERROR:   _DBG_COLOR(31); break;        \
+            case DBG_WARNING: _DBG_COLOR(33); break;        \
+            case DBG_INFO:    _DBG_COLOR(32); break;        \
+            default: break;                                 \
+        }                                                   \
+        rt_kprintf(DBG_SECTION_NAME fmt, ##__VA_ARGS__);    \
+        _DBG_COLOR(0);                                      \
+    }
+
+#define dbg_here                                            \
+    if ((DBG_LEVEL) >= DBG_LOG){                            \
+        rt_kprintf(DBG_SECTION_NAME " Here %s:%d\n",        \
+            __FUNCTION__, __LINE__);                        \
+    }
+
+#define dbg_enter                                           \
+    if ((DBG_LEVEL) >= DBG_LOG){                            \
+        _DBG_COLOR(32);                                     \
+        rt_kprintf(DBG_SECTION_NAME " Enter %s\n",          \
+            __FUNCTION__);                                  \
+        _DBG_COLOR(0);                                      \
+    }
+
+#define dbg_exit                                            \
+    if ((DBG_LEVEL) >= DBG_LOG){                            \
+        _DBG_COLOR(32);                                     \
+        rt_kprintf(DBG_SECTION_NAME " Exit  %s:%d\n",       \
+            __FUNCTION__);                                  \
+        _DBG_COLOR(0);                                      \
+    }
+
+#else
+#define dbg_log(level, fmt, ...)
+#define dbg_here
+#define dbg_enter
+#define dbg_exit
+#endif
+
+#endif
+
diff --git a/include/rtdef.h b/include/rtdef.h
index 5bc2ba2ce1..5c3f774226 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -30,6 +30,7 @@
  * 2012-12-30     Bernard      add more control command for graphic.
  * 2013-01-09     Bernard      change version number.
  * 2015-02-01     Bernard      change version number to v2.1.0
+ * 2016-08-31     Bernard      change version number to v3.0.0
  */
 
 #ifndef __RT_DEF_H__
@@ -201,6 +202,8 @@ typedef int (*init_fn_t)(void);
 /* device/component/fs/app init routines will be called in init_thread */
 /* device initialization */
 #define INIT_DEVICE_EXPORT(fn)          INIT_EXPORT(fn, "2")
+/* components pre-initialization (pure software initilization) */
+#define INIT_PREV_EXPORT(fn)            INIT_EXPORT(fn, "2")
 /* components initialization (dfs, lwip, ...) */
 #define INIT_COMPONENT_EXPORT(fn)       INIT_EXPORT(fn, "3")
 /* file system initialization (dfs-elm, dfs-rom, ...) */
@@ -259,6 +262,8 @@ typedef int (*init_fn_t)(void);
 #define RT_ENOSYS                       6               /**< No system */
 #define RT_EBUSY                        7               /**< Busy */
 #define RT_EIO                          8               /**< IO error */
+#define RT_EINTR                        9               /**< Interrupted system call */
+#define RT_EINVAL                       10              /**< Invalid argument */
 
 /*@}*/
 
@@ -288,6 +293,9 @@ typedef int (*init_fn_t)(void);
  */
 #define RT_NULL                         (0)
 
+/**
+ * Double List structure
+ */
 struct rt_list_node
 {
     struct rt_list_node *next;                          /**< point to next node. */
@@ -296,6 +304,15 @@ struct rt_list_node
 typedef struct rt_list_node rt_list_t;                  /**< Type for lists. */
 
 /**
+ * Single List structure
+ */
+struct rt_slist_node
+{
+    struct rt_slist_node *next;                         /**< point to next node. */
+};
+typedef struct rt_slist_node rt_slist_t;                /**< Type for single list. */
+
+/**
  * @addtogroup KernelObject
  */
 
@@ -447,6 +464,17 @@ typedef struct rt_timer *rt_timer_t;
 /*@}*/
 
 /**
+ * @addtogroup Signal
+ */
+#ifdef RT_USING_SIGNALS
+typedef unsigned long rt_sigset_t;
+typedef void (*rt_sighandler_t)(int signo);
+
+#define RT_SIG_MAX          32
+#endif
+/*@}*/
+
+/**
  * @addtogroup Thread
  */
 
@@ -466,6 +494,11 @@ typedef struct rt_timer *rt_timer_t;
 #define RT_THREAD_BLOCK                 RT_THREAD_SUSPEND   /**< Blocked status */
 #define RT_THREAD_CLOSE                 0x04                /**< Closed status */
 
+#define RT_THREAD_STAT_MASK             0x0f
+
+#define RT_THREAD_STAT_SIGNAL           0x10
+#define RT_THREAD_STAT_SIGNAL_READY     (RT_THREAD_STAT_SIGNAL | RT_THREAD_READY)
+
 /**
  * thread control command definitions
  */
@@ -501,7 +534,7 @@ struct rt_thread
     /* error code */
     rt_err_t    error;                                  /**< error code */
 
-    rt_uint8_t  stat;                                   /**< thread stat */
+    rt_uint8_t  stat;                                   /**< thread status */
 
     /* priority */
     rt_uint8_t  current_priority;                       /**< current priority */
@@ -518,6 +551,15 @@ struct rt_thread
     rt_uint8_t  event_info;
 #endif
 
+#if defined(RT_USING_SIGNALS)
+    rt_sigset_t sig_pending;                            /**< the pending signals */
+    rt_sigset_t sig_mask;                               /**< the mask bits of signal */
+
+    void            *sig_ret;                           /**< the return stack pointer from signal */
+    rt_sighandler_t *sig_vectors;                       /**< vectors of signal handler */
+    void            *si_list;                           /**< the signal infor list */
+#endif
+
     rt_ubase_t  init_tick;                              /**< thread's initialized tick */
     rt_ubase_t  remaining_tick;                         /**< remaining tick */
 
@@ -778,11 +820,6 @@ enum rt_device_class_type
 #define RT_DEVICE_FLAG_SUSPENDED        0x020           /**< device is suspended */
 #define RT_DEVICE_FLAG_STREAM           0x040           /**< stream mode */
 
-#define RT_DEVICE_CTRL_CONFIG           0x03            /* configure device */
-#define RT_DEVICE_CTRL_SET_INT          0x10            /* enable receive irq */
-#define RT_DEVICE_CTRL_CLR_INT          0x11            /* disable receive irq */
-#define RT_DEVICE_CTRL_GET_INT          0x12
-
 #define RT_DEVICE_FLAG_INT_RX           0x100           /**< INT mode on Rx */
 #define RT_DEVICE_FLAG_DMA_RX           0x200           /**< DMA mode on Rx */
 #define RT_DEVICE_FLAG_INT_TX           0x400           /**< INT mode on Tx */
@@ -793,12 +830,18 @@ enum rt_device_class_type
 #define RT_DEVICE_OFLAG_WRONLY          0x002           /**< write only access */
 #define RT_DEVICE_OFLAG_RDWR            0x003           /**< read and write */
 #define RT_DEVICE_OFLAG_OPEN            0x008           /**< device is opened */
+#define RT_DEVICE_OFLAG_MASK            0xf0f           /**< mask of open flag */
 
 /**
  * general device commands
  */
 #define RT_DEVICE_CTRL_RESUME           0x01            /**< resume device */
 #define RT_DEVICE_CTRL_SUSPEND          0x02            /**< suspend device */
+#define RT_DEVICE_CTRL_CONFIG           0x03            /**< configure device */
+
+#define RT_DEVICE_CTRL_SET_INT          0x10            /**< set interrupt */
+#define RT_DEVICE_CTRL_CLR_INT          0x11            /**< clear interrupt */
+#define RT_DEVICE_CTRL_GET_INT          0x12            /**< get interrupt status */
 
 /**
  * special device commands
@@ -840,7 +883,12 @@ struct rt_device
     rt_err_t  (*close)  (rt_device_t dev);
     rt_size_t (*read)   (rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size);
     rt_size_t (*write)  (rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size);
-    rt_err_t  (*control)(rt_device_t dev, rt_uint8_t cmd, void *args);
+    rt_err_t  (*control)(rt_device_t dev, int cmd, void *args);
+
+#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
+    const struct dfs_file_ops *fops;
+    rt_list_t wait_queue;
+#endif
 
     void                     *user_data;                /**< device private data */
 };
@@ -991,6 +1039,8 @@ struct rt_module
     rt_uint16_t                  nsym;                  /**< number of symbol in the module */
     struct rt_module_symtab     *symtab;                /**< module symbol table */
 
+    rt_uint32_t                  user_data;             /**< arch data in the module */
+
     /* object in this module, module object is the last basic object type */
     struct rt_object_information module_object[RT_Object_Class_Unknown];
 };
@@ -999,8 +1049,24 @@ typedef struct rt_module *rt_module_t;
 /*@}*/
 #endif
 
+/* definitions for libc */
+#include "rtlibc.h"
+
 #ifdef __cplusplus
 }
 #endif
 
+#ifdef __cplusplus
+/* RT-Thread definitions for C++ */
+namespace rtthread {
+
+enum TICK_WAIT {
+    WAIT_NONE = 0,
+    WAIT_FOREVER = -1,
+};
+
+}
+
+#endif /* end of __cplusplus */
+
 #endif
diff --git a/include/rtlibc.h b/include/rtlibc.h
new file mode 100644
index 0000000000..5d6b5a78e3
--- /dev/null
+++ b/include/rtlibc.h
@@ -0,0 +1,42 @@
+/*
+ * File      : rtlibc.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-01-21     Bernard      the first version
+ */
+
+#ifndef RTLIBC_H__
+#define RTLIBC_H__
+
+/* definitions for libc if toolchain has no these definitions */
+#include "libc/libc_stat.h"
+#include "libc/libc_errno.h"
+
+#include "libc/libc_fcntl.h"
+#include "libc/libc_ioctl.h"
+#include "libc/libc_dirent.h"
+#include "libc/libc_signal.h"
+
+#if defined(__CC_ARM) || defined(__IAR_SYSTEMS_ICC__)
+typedef signed long off_t;
+#endif
+
+#endif
+
diff --git a/include/rtservice.h b/include/rtservice.h
index 99ad033280..0ace555cdc 100644
--- a/include/rtservice.h
+++ b/include/rtservice.h
@@ -134,6 +134,73 @@ rt_inline int rt_list_isempty(const rt_list_t *l)
  */
 #define rt_list_first_entry(ptr, type, member) \
     rt_list_entry((ptr)->next, type, member)
+
+#define RT_SLIST_OBJECT_INIT(object) { RT_NULL }
+
+/**
+ * @brief initialize a single list
+ *
+ * @param l the single list to be initialized
+ */
+rt_inline void rt_slist_init(rt_slist_t *l)
+{
+    l->next = RT_NULL;
+}
+
+rt_inline void rt_slist_append(rt_slist_t *l, rt_slist_t *n)
+{
+    struct rt_slist_node *node;
+
+    node = l;
+    while (node->next) node = node->next;
+
+    /* append the node to the tail */
+    node->next = n;
+    n->next = RT_NULL;
+}
+
+rt_inline void rt_slist_insert(rt_slist_t *l, rt_slist_t *n)
+{
+    n->next = l->next;
+    l->next = n;
+}
+
+rt_inline rt_slist_t *rt_slist_remove(rt_slist_t *l, rt_slist_t *n)
+{
+    /* remove slist head */
+    struct rt_slist_node *node = l;
+    while (node->next && node->next != n) node = node->next;
+
+    /* remove node */
+    if (node->next != (rt_slist_t *)0) node->next = node->next->next;
+
+    return l;
+}
+
+/**
+ * @brief get the struct for this single list node
+ * @param node the entry point
+ * @param type the type of structure
+ * @param member the name of list in structure
+ */
+#define rt_slist_entry(node, type, member)    \
+    ((type *)((char*)(node)-(unsigned long)(&((type *)0)->member)))
+
+/**
+ * rt_slist_for_each_entry  -   iterate over single list of given type
+ * @node:   the type * to use as a loop cursor.
+ * @list:   the head for your single list.
+ */
+#define rt_slist_foreach(node, list)  \
+    for ((node) = (list)->next; (node) != RT_NULL; (node) = (node)->next)
+
+/**
+ * rt_container_of - return the member address of ptr, if the type of ptr is the 
+ * struct type.
+ */
+#define rt_container_of(ptr, type, member) \
+    ((type *)((char *)(ptr) - (unsigned long)(&((type *)0)->member)))
+
 /*@}*/
 
 #ifdef __cplusplus
diff --git a/include/rtthread.h b/include/rtthread.h
index 38fb895702..f0f3303778 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -87,7 +87,7 @@ void rt_system_tick_init(void);
 rt_tick_t rt_tick_get(void);
 void rt_tick_set(rt_tick_t tick);
 void rt_tick_increase(void);
-rt_tick_t rt_tick_from_millisecond(rt_uint32_t ms);
+int  rt_tick_from_millisecond(rt_int32_t ms);
 
 void rt_system_timer_init(void);
 void rt_system_timer_thread_init(void);
@@ -107,7 +107,7 @@ rt_timer_t rt_timer_create(const char *name,
 rt_err_t rt_timer_delete(rt_timer_t timer);
 rt_err_t rt_timer_start(rt_timer_t timer);
 rt_err_t rt_timer_stop(rt_timer_t timer);
-rt_err_t rt_timer_control(rt_timer_t timer, rt_uint8_t cmd, void *arg);
+rt_err_t rt_timer_control(rt_timer_t timer, int cmd, void *arg);
 
 rt_tick_t rt_timer_next_timeout_tick(void);
 void rt_timer_check(void);
@@ -149,11 +149,17 @@ rt_err_t rt_thread_delete(rt_thread_t thread);
 
 rt_err_t rt_thread_yield(void);
 rt_err_t rt_thread_delay(rt_tick_t tick);
-rt_err_t rt_thread_control(rt_thread_t thread, rt_uint8_t cmd, void *arg);
+rt_err_t rt_thread_control(rt_thread_t thread, int cmd, void *arg);
 rt_err_t rt_thread_suspend(rt_thread_t thread);
 rt_err_t rt_thread_resume(rt_thread_t thread);
 void rt_thread_timeout(void *parameter);
 
+#ifdef RT_USING_SIGNALS
+void rt_thread_alloc_sig(rt_thread_t tid);
+void rt_thread_free_sig(rt_thread_t tid);
+int  rt_thread_kill(rt_thread_t tid, int sig);
+#endif
+
 #ifdef RT_USING_HOOK
 void rt_thread_suspend_sethook(void (*hook)(rt_thread_t thread));
 void rt_thread_resume_sethook (void (*hook)(rt_thread_t thread));
@@ -191,6 +197,19 @@ void rt_scheduler_sethook(void (*hook)(rt_thread_t from, rt_thread_t to));
 /**@}*/
 
 /**
+ * @addtogroup Signals
+ * @{
+ */
+#ifdef RT_USING_SIGNALS
+void rt_signal_mask(int signo);
+void rt_signal_unmask(int signo);
+rt_sighandler_t rt_signal_install(int signo, rt_sighandler_t handler);
+
+int rt_system_signal_init(void);
+#endif
+/*@}*/
+
+/**
  * @addtogroup MM
  */
 
@@ -290,7 +309,7 @@ rt_err_t rt_sem_delete(rt_sem_t sem);
 rt_err_t rt_sem_take(rt_sem_t sem, rt_int32_t time);
 rt_err_t rt_sem_trytake(rt_sem_t sem);
 rt_err_t rt_sem_release(rt_sem_t sem);
-rt_err_t rt_sem_control(rt_sem_t sem, rt_uint8_t cmd, void *arg);
+rt_err_t rt_sem_control(rt_sem_t sem, int cmd, void *arg);
 #endif
 
 #ifdef RT_USING_MUTEX
@@ -304,7 +323,7 @@ rt_err_t rt_mutex_delete(rt_mutex_t mutex);
 
 rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t time);
 rt_err_t rt_mutex_release(rt_mutex_t mutex);
-rt_err_t rt_mutex_control(rt_mutex_t mutex, rt_uint8_t cmd, void *arg);
+rt_err_t rt_mutex_control(rt_mutex_t mutex, int cmd, void *arg);
 #endif
 
 #ifdef RT_USING_EVENT
@@ -322,7 +341,7 @@ rt_err_t rt_event_recv(rt_event_t   event,
                        rt_uint8_t   opt,
                        rt_int32_t   timeout,
                        rt_uint32_t *recved);
-rt_err_t rt_event_control(rt_event_t event, rt_uint8_t cmd, void *arg);
+rt_err_t rt_event_control(rt_event_t event, int cmd, void *arg);
 #endif
 
 #ifdef RT_USING_MAILBOX
@@ -343,7 +362,7 @@ rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
                          rt_uint32_t  value,
                          rt_int32_t   timeout);
 rt_err_t rt_mb_recv(rt_mailbox_t mb, rt_uint32_t *value, rt_int32_t timeout);
-rt_err_t rt_mb_control(rt_mailbox_t mb, rt_uint8_t cmd, void *arg);
+rt_err_t rt_mb_control(rt_mailbox_t mb, int cmd, void *arg);
 #endif
 
 #ifdef RT_USING_MESSAGEQUEUE
@@ -369,7 +388,7 @@ rt_err_t rt_mq_recv(rt_mq_t    mq,
                     void      *buffer,
                     rt_size_t  size,
                     rt_int32_t timeout);
-rt_err_t rt_mq_control(rt_mq_t mq, rt_uint8_t cmd, void *arg);
+rt_err_t rt_mq_control(rt_mq_t mq, int cmd, void *arg);
 #endif
 
 /**@}*/
@@ -410,7 +429,7 @@ rt_size_t rt_device_write(rt_device_t dev,
                           rt_off_t    pos,
                           const void *buffer,
                           rt_size_t   size);
-rt_err_t  rt_device_control(rt_device_t dev, rt_uint8_t cmd, void *arg);
+rt_err_t  rt_device_control(rt_device_t dev, int cmd, void *arg);
 
 /**@}*/
 #endif
@@ -513,6 +532,8 @@ int *_rt_errno(void);
 #endif
 #endif
 
+int __rt_ffs(int value);
+
 void *rt_memset(void *src, int c, rt_ubase_t n);
 void *rt_memcpy(void *dest, const void *src, rt_ubase_t n);