lwp: add softtime support sigval

We have a PR: RT-Thread#10057
submitted, but note it's a bit different against this patch.

For example:
- changes for lwp.c is not submitted.
- changes for ctime.c is a bit different.

Author: yixinghua121

components/libc/compilers/common/ctime.c

@@ -828,20 +828,27 @@ struct lwp_timer_event_param
         pid_t pid;
     };
     int signo;
+    union sigval sigval;
 };
 
 static void _lwp_timer_event_from_tid(struct rt_work *work, void *param)
 {
     rt_err_t ret;
     struct lwp_timer_event_param *data = rt_container_of(work, struct lwp_timer_event_param, work);
     rt_thread_t thread;
+    lwp_siginfo_ext_t ext;
 
     RT_ASSERT(data->tid);
 
     /* stop others from delete thread */
     thread = lwp_tid_get_thread_and_inc_ref(data->tid);
     /** The tid of thread is a READ ONLY value, but here still facing the risk of thread already been delete error */
-    ret = lwp_thread_signal_kill(thread, data->signo, SI_TIMER, 0);
+    ext = rt_malloc(sizeof(struct lwp_siginfo_ext));
+    if (ext)
+    {
+        ext->sigval = data->sigval;
+    }
+    ret = lwp_thread_signal_kill(thread, data->signo, SI_TIMER, ext);
     lwp_tid_dec_ref(thread);
 
     if (ret)
@@ -855,14 +862,19 @@ static void _lwp_timer_event_from_pid(struct rt_work *work, void *param)
     rt_err_t ret;
     struct lwp_timer_event_param *data = rt_container_of(work, struct lwp_timer_event_param, work);
     struct rt_lwp *lwp;
+    lwp_siginfo_ext_t ext;
 
     lwp_pid_lock_take();
     lwp = lwp_from_pid_locked(data->pid);
     if (lwp)
         lwp_ref_inc(lwp);
     lwp_pid_lock_release();
-
-    ret = lwp_signal_kill(lwp, data->signo, SI_TIMER, 0);
+    ext = rt_malloc(sizeof(struct lwp_siginfo_ext));
+    if (ext)
+    {
+        ext->sigval = data->sigval;
+    }
+    ret = lwp_signal_kill(lwp, data->signo, SI_TIMER, ext);
     if (lwp)
         lwp_ref_dec(lwp);
 
@@ -907,6 +919,7 @@ static void rtthread_timer_wrapper(void *timerobj)
     int tid = *(int *)ptid;
     struct lwp_timer_event_param *data = rt_container_of(timer->work, struct lwp_timer_event_param, work);
     data->signo = timer->sigev_signo;
+    data->sigval = timer->val;
 
     if (!tid)
     {

components/lwp/lwp.c

@@ -465,6 +465,12 @@ pid_t lwp_execve(char *filename, int debug, int argc, char **argv, char **envp)
         return -ENOMEM;
     }
 #endif
+    char *argv_last = argv[argc - 1];
+    int bg = 0;
+    if (argv_last[0] == '&' && argv_last[1] == '\0')
+    {
+        bg = 1;
+    }
 
     if ((aux = argscopy(lwp, argc, argv, envp)) == RT_NULL)
     {
@@ -479,7 +485,10 @@ pid_t lwp_execve(char *filename, int debug, int argc, char **argv, char **envp)
         rt_thread_t thread = RT_NULL;
         rt_uint32_t priority = 25, tick = 200;
 
-        lwp_execve_setup_stdio(lwp);
+        if (bg == 0)
+        {
+            lwp_execve_setup_stdio(lwp);
+        }
 
         /* obtain the base name */
         thread_name = strrchr(filename, '/');

components/lwp/lwp_signal.c

@@ -342,6 +342,8 @@ RT_STATIC_ASSERT(lp_width_same, sizeof(void *) == sizeof(long));
 rt_inline void siginfo_k2u(lwp_siginfo_t ksigi, siginfo_t *usigi)
 {
     int signo = ksigi->ksiginfo.signo;
+
+    memset(usigi, 0, sizeof(siginfo_t));
     usigi->si_code = ksigi->ksiginfo.code;
     usigi->si_signo = signo;
     usigi->si_pid = ksigi->ksiginfo.from_pid;
@@ -354,6 +356,10 @@ rt_inline void siginfo_k2u(lwp_siginfo_t ksigi, siginfo_t *usigi)
             usigi->si_utime = ksigi->ext->sigchld.stime;
             usigi->si_stime = ksigi->ext->sigchld.utime;
         }
+        else
+        {
+            usigi->si_value = ksigi->ext->sigval;
+        }
     }
 
     /* deprecated field */

include/rtdef.h

@@ -804,6 +804,7 @@ typedef struct lwp_siginfo_ext {
             clock_t utime;
             clock_t stime;
         } sigchld;
+        union sigval sigval;
     };
 } *lwp_siginfo_ext_t;