signal.h: fix compile failed when open TTY_SIGINT

In file included from string/lib_strsignal.c:40:0:
string/lib_strsignal.c: In function ‘strsignal’:
string/lib_strsignal.c:142:12: error: ‘CONFIG_SIG_STOP’ undeclared (first use in this function); did you mean ‘CONFIG_SIG_PIPE’?
       case SIGSTOP:
            ^
string/lib_strsignal.c:142:12: note: each undeclared identifier is reported only once for each function it appears in
string/lib_strsignal.c:147:12: error: ‘CONFIG_SIG_STP’ undeclared (first use in this function); did you mean ‘CONFIG_SIG_STOP’?
       case SIGSTP:

Esnure all standard signal number is always defined

Change-Id: I3abce86079ebeba7bab038d7c770efc90b9cffd7
Signed-off-by: ligd <liguiding1@xiaomi.com>

include/signal.h

@@ -166,16 +166,45 @@
 #  endif
 #endif
 
-#ifdef CONFIG_SIG_SIGSTOP_ACTION
+#ifndef CONFIG_SIG_STOP
+#  define SIGSTOP       6
+#else
 #  define SIGSTOP       CONFIG_SIG_STOP
+#endif
+
+#ifndef CONFIG_SIG_TSTP
+#  define SIGTSTP       7
+#else
 #  define SIGTSTP       CONFIG_SIG_TSTP
+#endif
+
+#ifndef CONFIG_SIG_CONT
+#  define SIGCONT       8
+#else
 #  define SIGCONT       CONFIG_SIG_CONT
 #endif
 
-#ifdef CONFIG_SIG_SIGKILL_ACTION
+#ifndef CONFIG_SIG_KILL
+#  define SIGKILL       9
+#else
 #  define SIGKILL       CONFIG_SIG_KILL
+#endif
+
+#ifndef CONFIG_SIG_INT
+#  define SIGINT        10
+#else
 #  define SIGINT        CONFIG_SIG_INT
+#endif
+
+#ifndef CONFIG_SIG_QUIT
+#  define SIGQUIT       11
+#else
 #  define SIGQUIT       CONFIG_SIG_QUIT
+#endif
+
+#ifndef CONFIG_SIG_TERM
+#  define SIGTERM       12
+#else
 #  define SIGTERM       CONFIG_SIG_TERM
 #endif
 

sched/Kconfig

@@ -1448,14 +1448,12 @@ if SIG_DEFAULT
 config SIG_STOP
 	int "SIGSTOP"
 	default 6
-	depends on SIG_SIGSTOP_ACTION
 	---help---
 		Suspend/pause a task.  SIGSTOP may not be caught or ignored.
 
 config SIG_TSTP
 	int "SIGTSTP"
 	default 7
-	depends on SIG_SIGSTOP_ACTION
 	---help---
 		Suspend/pause a task.  Unlike SIGSTOP, this signal can be caught or
 		ignored.
@@ -1463,7 +1461,6 @@ config SIG_TSTP
 config SIG_CONT
 	int "SIGCONT"
 	default 8
-	depends on SIG_SIGSTOP_ACTION
 	---help---
 		Resume a suspended/paused task.  SIGSTOP only has an action when
 		send to a stopped task.  SIGCONT is ignored by other task.  SIGCONT
@@ -1472,7 +1469,6 @@ config SIG_CONT
 config SIG_KILL
 	int "SIGKILL"
 	default 9
-	depends on SIG_SIGKILL_ACTION
 	---help---
 		The SIGKILL signal is sent to cause a task termination event.
 		SIGKILL may not be caught or ignored.
@@ -1480,7 +1476,6 @@ config SIG_KILL
 config SIG_INT
 	int "SIGINT"
 	default 10
-	depends on SIG_SIGKILL_ACTION
 	---help---
 		The SIGINT signal is sent to cause a task termination event.
 		SIGINT may be ignored or caught by the receiving task.
@@ -1488,7 +1483,6 @@ config SIG_INT
 config SIG_QUIT
 	int "SIGQUIT"
 	default 11
-	depends on SIG_SIGKILL_ACTION
 	---help---
 		The SIGINT signal is sent to cause a task termination event.
 		SIGQUIT may be ignored or caught by the receiving task.
@@ -1496,7 +1490,6 @@ config SIG_QUIT
 config SIG_TERM
 	int "SIGTERM"
 	default 12
-	depends on SIG_SIGKILL_ACTION
 	---help---
 		The SIGINT signal is sent to cause a task termination event.
 		SIGTERM may be ignored or caught by the receiving task.