signal.h

05/main.c

@@ -3,14 +3,8 @@
 #include <stdio.h>
 #include <signal.h>
 
-void test_signal_handler(int x) {
-	printf("interompu\n");
-	_Exit(0);
-}
-
 int main(int argc, char **argv) {
-	signal(SIGINT, test_signal_handler);
+	raise(SIGKILL);
-	while (1){}
 	return 0;
 }
 

05/signal.h

@@ -6,9 +6,9 @@
 
 typedef long sig_atomic_t; // there are no "asynchronous interrupts"
 
-#define SIG_DFL 0
+#define SIG_DFL ((void *)0)
 #define SIG_IGN _sig_ign
-#define SIG_ERR (-1)
+#define SIG_ERR ((void *)-1)
 
 typedef void (*_Sighandler)(int);
 
@@ -30,6 +30,7 @@ unsigned char _signal_restorer[] = {
 
 // we need to do this weird indirection because linux has a different
 // calling convention from us.
+
 unsigned char _signal_handler[] = {
 	// signal # passed in rdi
 	0x48,0x89,0xf8,                     // mov rax, rdi (signal #)
@@ -61,25 +62,29 @@ void _sig_ign(int signal) {
 static unsigned long _sig_mask = 0;
 
 _Sighandler signal(int sig, _Sighandler func) {
-	if (func == SIG_DFL) {
+	void **handlers = _SIGNAL_HANDLERS;
-		// @TODO
+	_Sighandler ret = handlers[sig];
-		return 0;
-	}
 	if (func == SIG_IGN) {
 		func = _sig_ign;
 	}
-	
-	void **handlers = _SIGNAL_HANDLERS;
 	handlers[sig] = func;
 	
+	if (func == SIG_DFL) {
+		_sig_mask &= ~(1ul << (sig-1));
+	} else {
 		_sig_mask |= 1ul << (sig-1);
+	}
 	struct sigaction act = {0};
-	act.handler = _signal_handler;
+	act.handler = func == SIG_DFL ? SIG_DFL : (void*)_signal_handler;
 	act.mask = _sig_mask;
 	act.flags = _SA_RESTORER;
 	act.restorer = _signal_restorer;
 	__sigaction(sig, &act, NULL);
-	return 0;//@TODO
+	return ret;
+}
+
+int raise(int signal) {
+	return kill(getpid(), signal);
 }
 
 #endif // _SIGNAL_H

05/stdc_common.h

@@ -110,6 +110,7 @@ int getpid(void) {
 
 #define SIGABRT 6
 #define SIGFPE 8
+#define SIGKILL 9
 #define SIGILL 4
 #define SIGINT 2
 #define SIGSEGV 11