the support for PSE51 (#5534)

* [add] the function realization of signal for posix.
* [update] the posix support for armclang.
* [add] the new macro "RT_USING_POSIX_TIMER".
* [modify] select "RT_USING_SOFT_TIMER" when use posix'timer.
* [bug] optimize the logic for the "time_xxx" functions.
* [modify] use "RT_USING_POSIX_TIMER" to protect the macro definition.
* [modify] error code when except happened.
* [delete] the "environ" is useless at this time.

components/libc/compilers/common/extension/sys/types.h

@@ -28,6 +28,8 @@ typedef signed int       ssize_t;       /* Used for a count of bytes or an error
 #else
 typedef long signed int  ssize_t;       /* Used for a count of bytes or an error indication. */
 #endif
+typedef unsigned long    __timer_t;
+typedef __timer_t        timer_t;
 typedef long             suseconds_t;   /* microseconds. */
 typedef unsigned long    useconds_t;    /* microseconds (unsigned) */
 

components/libc/compilers/common/extension/sys/unistd.h

@@ -19,10 +19,13 @@
 #define STDOUT_FILENO   1       /* standard output file descriptor */
 #define STDERR_FILENO   2       /* standard error file descriptor */
 
+unsigned alarm(unsigned __secs);
 ssize_t read(int fd, void *buf, size_t len);
 ssize_t write(int fd, const void *buf, size_t len);
 off_t lseek(int fd, off_t offset, int whence);
+int pause(void);
 int fsync(int fildes);
+long sysconf(int __name);
 int unlink(const char *pathname);
 int close(int d);
 int ftruncate(int fd, off_t length);

components/libc/compilers/common/sys/signal.h

@@ -17,6 +17,19 @@ extern "C" {
 #endif
 
 #include <stdint.h>
+#include <sys/types.h>
+
+
+/* sigev_notify values
+   NOTE: P1003.1c/D10, p. 34 adds SIGEV_THREAD.  */
+
+#define SIGEV_NONE   1  /* No asynchronous notification shall be delivered */
+                        /*   when the event of interest occurs. */
+#define SIGEV_SIGNAL 2  /* A queued signal, with an application defined */
+                        /*  value, shall be delivered when the event of */
+                        /*  interest occurs. */
+#define SIGEV_THREAD 3  /* A notification function shall be called to */
+                        /*   perform notification. */
 
 /*  Signal Generation and Delivery, P1003.1b-1993, p. 63
     NOTE: P1003.1c/D10, p. 34 adds sigev_notify_function and
@@ -62,6 +75,16 @@ struct sigaction
     int sa_flags;
 };
 
+/*
+ * Structure used in sigaltstack call.
+ */
+typedef struct sigaltstack
+{
+  void     *ss_sp;    /* Stack base or pointer.  */
+  int       ss_flags; /* Flags.  */
+  size_t    ss_size;  /* Stack size.  */
+} stack_t;
+
 #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 */
@@ -73,6 +96,15 @@ struct sigaction
 #define sigismember(what,sig) (((*(what)) & (1<<(sig))) != 0)
 
 int sigprocmask (int how, const sigset_t *set, sigset_t *oset);
+int sigpending (sigset_t *set);
+int sigsuspend (const sigset_t *set);
+
+#include "time.h"
+int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec *timeout);
+int sigwait(const sigset_t *set, int *sig);
+int sigwaitinfo(const sigset_t *set, siginfo_t *info);
+int raise(int sig);
+int sigqueue(pid_t pid, int signo, const union sigval value);
 int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
 
 #ifdef __ARMCC_VERSION
@@ -100,6 +132,9 @@ int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
 #define SIGTTOU     22
 #define SIGPOLL     23
 #define SIGWINCH    24
+#define SIGXCPU     24  /* exceeded CPU time limit */
+#define SIGXFSZ     25  /* exceeded file size limit */
+#define SIGVTALRM   26  /* virtual time alarm */
 /* #define SIGUSR1     25 */
 /* #define SIGUSR2     26 */
 #define SIGRTMIN    27
@@ -133,6 +168,9 @@ int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
 #define SIGTTOU     22
 #define SIGPOLL     23
 #define SIGWINCH    24
+#define SIGXCPU     24  /* exceeded CPU time limit */
+#define SIGXFSZ     25  /* exceeded file size limit */
+#define SIGVTALRM   26  /* virtual time alarm */
 #define SIGUSR1     25
 #define SIGUSR2     26
 #define SIGRTMIN    27

components/libc/compilers/common/sys/time.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2021, RT-Thread Development Team
+ * Copyright (c) 2006-2022, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -60,6 +60,16 @@ struct timespec
     time_t  tv_sec;     /* seconds */
     long    tv_nsec;    /* and nanoseconds */
 };
+
+/*
+ * Structure defined by POSIX.1b to be like a itimerval, but with
+ * timespecs. Used in the timer_*() system calls.
+ */
+struct itimerspec
+{
+    struct timespec  it_interval;
+    struct timespec  it_value;
+};
 #endif
 
 int stime(const time_t *t);
@@ -68,6 +78,9 @@ int gettimeofday(struct timeval *tv, struct timezone *tz);
 int settimeofday(const struct timeval *tv, const struct timezone *tz);
 #if defined(__ARMCC_VERSION) || defined (__ICCARM__)
 struct tm *gmtime_r(const time_t *timep, struct tm *r);
+struct tm* localtime_r(const time_t* t, struct tm* r);
+char* asctime_r(const struct tm *t, char *buf);
+char *ctime_r(const time_t * tim_p, char * result);
 #elif defined(_WIN32)
 struct tm* gmtime_r(const time_t* timep, struct tm* r);
 struct tm* gmtime(const time_t* t);
@@ -84,7 +97,7 @@ time_t time(time_t* t);
 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
 #endif /* RT_USING_POSIX_DELAY */
 
-#ifdef RT_USING_POSIX_CLOCK
+#if defined(RT_USING_POSIX_CLOCK) || defined (RT_USING_POSIX_TIMER)
 /* POSIX clock and timer */
 #define MILLISECOND_PER_SECOND  1000UL
 #define MICROSECOND_PER_SECOND  1000000UL
@@ -110,7 +123,9 @@ int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
 #ifndef CLOCK_MONOTONIC
 #define CLOCK_MONOTONIC     4
 #endif
+#endif /* defined(RT_USING_POSIX_CLOCK) || defined (RT_USING_POSIX_TIMER) */
 
+#ifdef RT_USING_POSIX_CLOCK
 int clock_getres  (clockid_t clockid, struct timespec *res);
 int clock_gettime (clockid_t clockid, struct timespec *tp);
 int clock_settime (clockid_t clockid, const struct timespec *tp);
@@ -118,6 +133,16 @@ int clock_nanosleep(clockid_t clockid, int flags, const struct timespec *rqtp, s
 int rt_timespec_to_tick(const struct timespec *time);
 #endif /* RT_USING_POSIX_CLOCK */
 
+#ifdef RT_USING_POSIX_TIMER
+#include "signal.h"
+int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid);
+int timer_delete(timer_t timerid);
+int timer_getoverrun(timer_t timerid);
+int timer_gettime(timer_t timerid, struct itimerspec *its);
+int timer_settime(timer_t timerid, int flags, const struct itimerspec *value,
+                  struct itimerspec *ovalue);
+#endif /* RT_USING_POSIX_TIMER */
+
 /* timezone */
 void tz_set(int8_t tz);
 int8_t tz_get(void);

components/libc/compilers/common/time.c

@@ -718,6 +718,269 @@ RTM_EXPORT(rt_timespec_to_tick);
 
 #endif /* RT_USING_POSIX_CLOCK */
 
+#ifdef RT_USING_POSIX_TIMER
+
+#define ACTIVE 1
+#define NOT_ACTIVE 0
+
+struct timer_obj
+{
+    struct rt_timer timer;
+    void (*sigev_notify_function)(union sigval val);
+    union sigval val;
+    struct timespec interval;              /* Reload value */
+    rt_uint32_t reload;                    /* Reload value in ms */
+    rt_uint32_t status;
+};
+
+static void rtthread_timer_wrapper(void *timerobj)
+{
+    struct timer_obj *timer;
+
+    timer = (struct timer_obj *)timerobj;
+
+    if (timer->reload == 0U)
+    {
+        timer->status = NOT_ACTIVE;
+    }
+
+    if(timer->sigev_notify_function != RT_NULL)
+    {
+        (timer->sigev_notify_function)(timer->val);
+    }
+}
+
+/**
+ * @brief Create a per-process timer.
+ *
+ * This API does not accept SIGEV_THREAD as valid signal event notification
+ * type.
+ *
+ * See IEEE 1003.1
+ */
+int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
+{
+    static int num = 0;
+    struct timer_obj *timer;
+    char timername[RT_NAME_MAX] = {0};
+
+    if (clockid != CLOCK_MONOTONIC || evp == NULL ||
+        (evp->sigev_notify != SIGEV_NONE &&
+         evp->sigev_notify != SIGEV_SIGNAL))
+    {
+        rt_set_errno(EINVAL);
+        return -RT_ERROR;
+    }
+
+    timer = rt_malloc(sizeof(struct timer_obj));
+    if(timer == RT_NULL)
+    {
+        rt_set_errno(ENOMEM);
+        return -RT_ENOMEM;
+    }
+
+    RT_ASSERT(evp->sigev_notify_function != RT_NULL);
+    rt_snprintf(timername, RT_NAME_MAX, "psx_tm%02d", num++);
+    num %= 100;
+    timer->sigev_notify_function = evp->sigev_notify_function;
+    timer->val = evp->sigev_value;
+    timer->interval.tv_sec = 0;
+    timer->interval.tv_nsec = 0;
+    timer->reload = 0U;
+    timer->status = NOT_ACTIVE;
+
+    if (evp->sigev_notify == SIGEV_NONE)
+    {
+        rt_timer_init(&timer->timer, timername, RT_NULL, RT_NULL, 0, RT_TIMER_FLAG_ONE_SHOT | RT_TIMER_FLAG_SOFT_TIMER);
+    }
+    else
+    {
+        rt_timer_init(&timer->timer, timername, rtthread_timer_wrapper, timer, 0, RT_TIMER_FLAG_ONE_SHOT | RT_TIMER_FLAG_SOFT_TIMER);
+    }
+
+    *timerid = (timer_t)timer;
+
+    return RT_EOK;
+}
+RTM_EXPORT(timer_create);
+
+/**
+ * @brief Delete a per-process timer.
+ *
+ * See IEEE 1003.1
+ */
+int timer_delete(timer_t timerid)
+{
+    struct timer_obj *timer = (struct timer_obj *)timerid;
+
+    if (timer == RT_NULL)
+    {
+        rt_set_errno(EINVAL);
+        return -RT_ERROR;
+    }
+
+    if (timer->status == ACTIVE)
+    {
+        timer->status = NOT_ACTIVE;
+        rt_timer_stop(&timer->timer);
+    }
+
+    rt_free(timer);
+
+    return RT_EOK;
+}
+RTM_EXPORT(timer_delete);
+
+/**
+ *
+ *  Return the overrun count for the last timer expiration.
+ *  It is subefficient to create a new structure to get overrun count.
+ **/
+int timer_getoverrun(timer_t timerid)
+{
+    rt_set_errno(ENOSYS);
+    return -RT_ERROR;
+}
+
+/**
+ * @brief Get amount of time left for expiration on a per-process timer.
+ *
+ * See IEEE 1003.1
+ */
+int timer_gettime(timer_t timerid, struct itimerspec *its)
+{
+    struct timer_obj *timer = (struct timer_obj *)timerid;
+    rt_tick_t remaining;
+    rt_uint32_t seconds, nanoseconds;
+    rt_int64_t nsecs, secs;
+
+    if (timer == NULL)
+    {
+        rt_set_errno(EINVAL);
+        return -RT_ERROR;
+    }
+
+    if (its == NULL)
+    {
+        rt_set_errno(EFAULT);
+        return -RT_ERROR;
+    }
+
+    if (timer->status == ACTIVE)
+    {
+        rt_tick_t remain_tick;
+
+        rt_timer_control(&timer->timer, RT_TIMER_CTRL_GET_REMAIN_TIME, &remain_tick);
+
+        /* 'remain_tick' is minimum-unit in the RT-Thread' timer,
+         * so the seconds, nanoseconds will be calculated by 'remain_tick'.
+         */
+        remaining = remain_tick - rt_tick_get();
+
+        /* calculate 'second' */
+        seconds = remaining / RT_TICK_PER_SECOND;
+
+        /* calculate 'nanosecond';  To avoid lost of accuracy, because "RT_TICK_PER_SECOND" maybe 100, 1000, 1024 and so on.
+         *
+         *        remain_tick                  millisecond                                 remain_tick * MILLISECOND_PER_SECOND
+         *  ------------------------- = --------------------------  --->  millisecond = -------------------------------------------
+         *    RT_TICK_PER_SECOND          MILLISECOND_PER_SECOND                                RT_TICK_PER_SECOND
+         *
+         *                    remain_tick * MILLISECOND_PER_SECOND                          remain_tick * MILLISECOND_PER_SECOND * MICROSECOND_PER_SECOND
+         *   millisecond = ----------------------------------------  ---> nanosecond = -------------------------------------------------------------------
+         *                         RT_TICK_PER_SECOND                                                           RT_TICK_PER_SECOND
+         *
+         */
+        nanoseconds = (((remaining % RT_TICK_PER_SECOND) * MILLISECOND_PER_SECOND) * MICROSECOND_PER_SECOND) / RT_TICK_PER_SECOND ;
+
+        its->it_value.tv_sec = (rt_int32_t)seconds;
+        its->it_value.tv_nsec = (rt_int32_t)nanoseconds;
+    }
+    else
+    {
+        /* Timer is disarmed */
+        its->it_value.tv_sec = 0;
+        its->it_value.tv_nsec = 0;
+    }
+
+    /* The interval last set by timer_settime() */
+    its->it_interval = timer->interval;
+    return RT_EOK;
+}
+RTM_EXPORT(timer_gettime);
+
+/**
+ * @brief Sets expiration time of per-process timer.
+ *
+ * See IEEE 1003.1
+ */
+int timer_settime(timer_t timerid, int flags, const struct itimerspec *value,
+                  struct itimerspec *ovalue)
+{
+    struct timer_obj *timer = (struct timer_obj *)timerid;
+    rt_uint32_t duration, current;
+
+    if (timer == NULL ||
+        value->it_interval.tv_nsec < 0 ||
+        value->it_interval.tv_nsec >= NANOSECOND_PER_SECOND ||
+        value->it_value.tv_nsec < 0 ||
+        value->it_value.tv_nsec >= NANOSECOND_PER_SECOND)
+    {
+        rt_set_errno(EINVAL);
+        return -RT_ERROR;
+    }
+
+    if (value == NULL || ovalue == NULL)
+    {
+        rt_set_errno(EFAULT);
+        return -RT_ERROR;
+    }
+
+    /*  Save time to expire and old reload value. */
+    if (ovalue != NULL)
+    {
+        timer_gettime(timerid, ovalue);
+    }
+
+    /* Stop the timer if the value is 0 */
+    if ((value->it_value.tv_sec == 0) && (value->it_value.tv_nsec == 0))
+    {
+        if (timer->status == ACTIVE)
+        {
+            rt_timer_stop(&timer->timer);
+        }
+
+        timer->status = NOT_ACTIVE;
+        return RT_EOK;
+    }
+
+    /* calculate timer period(tick);  To avoid lost of accuracy, because "RT_TICK_PER_SECOND" maybe 100, 1000, 1024 and so on.
+        *
+        *          tick                        nanosecond                          nanosecond * RT_TICK_PER_SECOND
+        *  ------------------------- = --------------------------  --->  tick = -------------------------------------
+        *    RT_TICK_PER_SECOND           NANOSECOND_PER_SECOND                         NANOSECOND_PER_SECOND
+        *
+        */
+    timer->reload = (value->it_interval.tv_sec * RT_TICK_PER_SECOND) + (value->it_interval.tv_nsec * RT_TICK_PER_SECOND) / NANOSECOND_PER_SECOND;
+    timer->interval.tv_sec = value->it_interval.tv_sec;
+    timer->interval.tv_nsec = value->it_interval.tv_nsec;
+
+    if (timer->status == ACTIVE)
+    {
+        rt_timer_stop(&timer->timer);
+    }
+
+    timer->status = ACTIVE;
+    rt_timer_control(&timer->timer, RT_TIMER_CTRL_SET_TIME, (void *)timer->reload);
+    rt_timer_control(&timer->timer, RT_TIMER_CTRL_SET_PERIODIC, RT_NULL);
+    rt_timer_start(&timer->timer);
+
+    return RT_EOK;
+}
+RTM_EXPORT(timer_settime);
+#endif /* RT_USING_POSIX_TIMER */
+
+
 /* timezone */
 #ifndef RT_LIBC_DEFAULT_TIMEZONE
 #define RT_LIBC_DEFAULT_TIMEZONE    8

components/libc/posix-info.txt

@@ -0,0 +1,327 @@
+### The list of function support for POSIX 51 standard in the RT-Thread
+
+<ctype.h>
++ isalnum()
++ isalpha()
++ isblank()
++ iscntrl()
++ isdigit()
++ isgraph()
++ islower()
++ isprint()
++ ispunct()
++ isspace()
++ isupper()
++ isxdigit()
++ tolower()
++ toupper()
+
+<errno.h> -> for gcc, keil, iar platform at the same time;
+                             Suggest to choose <sys/errno.h>
++ errno
+
+<fcntl.h>
++ open()
+
+<fenv.h>       ;the 'env' should combined with non-volatile devices
++ feclearexcept()
++ fegetenv()
++ fegetexceptflag()
++ fegetround()
++ feholdexcept()
++ feraiseexcept()
++ fesetenv()
++ fesetexceptflag()
++ fesetround()
++ fetestexcept()
++ feupdateenv()
+
+<inttypes.h>
++ imaxabs()
++ imaxdiv()
++ strtoimax()
++ strtoumax()
+
+<locale.h>
++ localeconv()
++ setlocale()
+
+<pthread.h>
++ pthread_atfork()
++ pthread_attr_destroy()
++ pthread_attr_getdetachstate()
++ pthread_attr_getguardsize()
++ pthread_attr_getinheritsched()
++ pthread_attr_getschedparam()
++ pthread_attr_getschedpolicy()
++ pthread_attr_getscope()
++ pthread_attr_getstack()
++ pthread_attr_getstackaddr()
++ pthread_attr_getstacksize()
++ pthread_attr_init()
++ pthread_attr_setdetachstate()
++ pthread_attr_setguardsize()
++ pthread_attr_setinheritsched()
++ pthread_attr_setschedparam()
++ pthread_attr_setschedpolicy()
++ pthread_attr_setscope()
++ pthread_attr_setstack()
++ pthread_attr_setstackaddr()
++ pthread_attr_setstacksize()
++ pthread_cancel()
++ pthread_cleanup_pop()
++ pthread_cleanup_push()
++ pthread_cond_broadcast()
++ pthread_cond_destroy()
++ pthread_cond_init()
++ pthread_cond_signal()
++ pthread_cond_timedwait()
++ pthread_cond_wait()
++ pthread_condattr_destroy()
++ pthread_condattr_getclock()
++ pthread_condattr_init()
++ pthread_condattr_setclock()
++ pthread_create()
++ pthread_detach()
++ pthread_equal()
++ pthread_exit()
++ pthread_getcpuclockid()
++ pthread_getconcurrency()
++ pthread_getschedparam()
++ pthread_getspecific()
++ pthread_join()
++ pthread_key_create()
++ pthread_key_delete()
++ pthread_mutex_destroy()
++ pthread_mutex_getprioceiling()
++ pthread_mutex_init()
++ pthread_mutex_lock()
++ pthread_mutex_setprioceiling()
++ pthread_mutex_trylock()
++ pthread_mutex_unlock()
++ pthread_mutexattr_destroy()
++ pthread_mutexattr_getprioceiling()
++ pthread_mutexattr_getprotocol()
++ pthread_mutexattr_gettype()
++ pthread_mutexattr_init()
++ pthread_mutexattr_setprioceiling()
++ pthread_mutexattr_setprotocol()
++ pthread_mutexattr_settype()
++ pthread_once()
++ pthread_self()
++ pthread_setcancelstate()
++ pthread_setcanceltype()
++ pthread_setconcurrency()
++ pthread_setschedparam()
++ pthread_setschedprio()
++ pthread_setspecific()
++ pthread_testcancel()
+
+<sched.h>
++ sched_get_priority_max()
++ sched_get_priority_min()
++ sched_rr_get_interval()
+
+<samaphore.h>
++ sem_close()
++ sem_destroy()
++ sem_getvalue()
++ sem_init()
++ sem_open()
++ sem_post()
++ sem_timedwait()
++ sem_trywait()
++ sem_unlink()
++ sem_wait()
+
+<setjmp.h>
++ longjmp()
++ setjmp()
+
+<signal.h> -> for gcc, keil, iar platform at the same time;
+                             Suggest to choose <sys/signal.h>
++ kill()
++ pthread_kill()
++ pthread_sigmask()
++ raise()
++ sigaction()
++ sigaddset()
++ sigdelset()
++ sigemptyset()
++ sigfillset()
++ sigismember()
++ signal()
++ sigpending()
++ sigprocmask()
+- sigqueue()
++ sigsuspend()
++ sigtimedwait()
++ sigwait()
++ sigwaitinfo()
+
+<stdarg.h>
++ va_arg()
++ va_copy()
++ va_end()
++ va_start()
+
+<stdio.h>
++ clearerr()
++ fclose()
+- fdopen()
++ feof()
++ ferror()
++ fflush()
++ fgetc()
++ fgets()
+- fileno()
+- flockfile()
++ fopen()
++ fprintf()
++ fputc()
++ fputs()
++ fread()
++ freopen()
++ fscanf()
+- ftrylockfile()
+- funlockfile()
++ fwrite()
++ getc()
+% getc_unlocked()       ; thread safe in the default
++ getchar()
++ getchar_unlocked()
++ gets()
++ perror()
++ printf()
++ putc()
+% putc_unlocked()       ; thread safe in the default
++ putchar()
+% putchar_unlocked()    ; thread safe in the default
++ puts()
++ scanf()
++ setbuf()
++ setvbuf()
++ snprintf()
++ sprintf()
++ sscanf()
++ stderr
++ stdin
++ stdout
++ ungetc()
++ vfprintf()
++ vfscanf()
++ vprintf()
++ vscanf()
++ vsnprintf()
++ vsprintf()
++ vsscanf()
+
+<stdlib.h>
++ abort()
++ abs()
++ atof()
++ atoi()
++ atol()
++ atoll()
++ bsearch()
++ calloc()
++ div()
++ free()
++ getenv()
++ labs()
++ ldiv()
++ llabs()
++ lldiv()
++ malloc()
++ qsort()
++ rand()
+% rand_r()     ; thread safe in the default
++ realloc()
+- setenv()     ;the 'env' should combined with non-volatile devices
++ srand()
++ strtod()
++ strtof()
++ strtol()
++ strtold()
++ strtoll()
++ strtoul()
++ strtoull()
+- unsetenv()   ;the 'env' should combined with non-volatile devices
+
+<string.h>
++ memchr()
++ memcmp()
++ memcpy()
++ memmove()
++ memset()
++ strcat()
++ strchr()
++ strcmp()
++ strcoll()
++ strcpy()
++ strcspn()
++ strerror()
+% strerror_r() ; thread safe in the default
++ strlen()
++ strncat()
++ strncmp()
++ strncpy()
++ strpbrk()
++ strrchr()
++ strspn()
++ strstr()
++ strtok()
+% strtok_r()   ; thread safe in the default
++ strxfrm()
+
+<sys/mman.h>
+- mlockall()
++ mmap()
+- munlock()
++ munmap()
+- shm_open()
+- shm_unlink()
+
+<sys/utsname.h>
++ uname()
+
+<time.h>   -> for gcc, keil, iar platform at the same time;
+                             Suggest to choose <sys/time.h>
++ asctime()
++ asctime_r()
++ clock_getres()
++ clock_gettime()
++ clock_nanosleep()
++ clock_settime()
++ ctime()
++ ctime_r()
++ difftime()
++ gmtime()
++ gmtime_r()
++ localtime()
++ localtime_r()
++ mktime()
++ nanosleep()
++ strftime()
++ time()
++ timer_create()
++ timer_delete()
++ timer_getoverrun()
++ timer_gettime()
++ timer_settime()
+% tzname       ; you should better use 'tz_xxx' in the rt-thread.
+% tzset()      ; you should better use 'tz_xxx' in the rt-thread.
+
+<unistd.h>
++ alarm()
++ close()
++ environ
+% fdatasync()   ;smaller ranther than <fsync>, in the rt-thread, it is universal
++ fsync()
++ pause()
++ read()
++ sysconf()
++ write()
+- confstr()
+
+

components/libc/posix/Kconfig

@@ -49,6 +49,11 @@ config RT_USING_POSIX_CLOCK
     select RT_USING_POSIX_DELAY
     default n
 
+config RT_USING_POSIX_TIMER
+    select RT_USING_TIMER_SOFT
+    bool "Enable posix time functions, timer_create()/timer_gettime()/timer_settime() etc"
+    default n
+
 config RT_USING_PTHREADS
     bool "Enable pthreads APIs"
     select RT_USING_POSIX_CLOCK

components/libc/posix/delay/delay.h

@@ -11,6 +11,7 @@
 #ifndef __DELAY_H__
 #define __DELAY_H__
 
+unsigned int sleep(unsigned int seconds);
 void msleep(unsigned int msecs);
 void ssleep(unsigned int seconds);
 void mdelay(unsigned long msecs);

components/libc/posix/pthreads/pthread.h

@@ -185,6 +185,10 @@ int pthread_setschedprio(pthread_t thread, int prio);
 void pthread_exit (void *value_ptr);
 int pthread_once(pthread_once_t * once_control, void (*init_routine) (void));
 
+#ifdef RT_USING_SIGNALS
+int pthread_sigmask(int how, const sigset_t *set, sigset_t *oset);
+#endif
+
 /* pthread cleanup */
 void pthread_cleanup_pop(int execute);
 void pthread_cleanup_push(void (*routine)(void*), void *arg);

components/libc/posix/signal/posix_signal.c

@@ -55,6 +55,35 @@ int sigprocmask (int how, const sigset_t *set, sigset_t *oset)
     return 0;
 }
 
+int sigpending (sigset_t *set)
+{
+    sigprocmask(SIG_SETMASK, RT_NULL, set);
+    return 0;
+}
+
+int sigsuspend (const sigset_t *set)
+{
+    int ret  = 0;
+    sigset_t origin_set;
+    sigset_t suspend_set;
+    siginfo_t info;            /* unless paremeter */
+
+    /* get the origin signal information */
+    sigpending(&origin_set);
+
+    /* set the new signal information */
+    sigprocmask(SIG_BLOCK, set, RT_NULL);
+    sigpending(&suspend_set);
+
+    ret = rt_signal_wait(&suspend_set, &info, RT_WAITING_FOREVER);
+
+    /* restore the original sigprocmask */
+    sigprocmask(SIG_UNBLOCK, (sigset_t *)0xffffUL, RT_NULL);
+    sigprocmask(SIG_BLOCK, &origin_set, RT_NULL);
+
+    return ret;
+}
+
 int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
 {
     rt_sighandler_t old = RT_NULL;
@@ -75,8 +104,7 @@ int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
     return 0;
 }
 
-int sigtimedwait(const sigset_t *set, siginfo_t *info,
-       const struct timespec *timeout)
+int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec *timeout)
 {
     int ret  = 0;
     int tick = RT_WAITING_FOREVER;
@@ -114,3 +142,11 @@ int raise(int sig)
     return 0;
 }
 
+#include <sys/types.h>
+int sigqueue (pid_t pid, int signo, const union sigval value)
+{
+    /* no support, signal queue */
+
+    return -1;
+}
+

include/rtdef.h

@@ -487,6 +487,7 @@ struct rt_object_information
 #define RT_TIMER_CTRL_SET_ONESHOT       0x2             /**< change timer to one shot */
 #define RT_TIMER_CTRL_SET_PERIODIC      0x3             /**< change timer to periodic */
 #define RT_TIMER_CTRL_GET_STATE         0x4             /**< get timer run state active or deactive*/
+#define RT_TIMER_CTRL_GET_REMAIN_TIME   0x5             /**< get the remaining hang time */
 
 #ifndef RT_TIMER_SKIP_LIST_LEVEL
 #define RT_TIMER_SKIP_LIST_LEVEL          1

src/timer.c

@@ -581,6 +581,8 @@ rt_err_t rt_timer_control(rt_timer_t timer, int cmd, void *arg)
             /*timer is stop*/
             *(rt_uint32_t *)arg = RT_TIMER_FLAG_DEACTIVATED;
         }
+    case RT_TIMER_CTRL_GET_REMAIN_TIME:
+        *(rt_tick_t *)arg =  timer->timeout_tick;
         break;
 
     default: