Added atexit(3) and on_exit(3).

libmaxsi/Makefile

@@ -45,6 +45,7 @@ ioleast.o \
 terminal.o \
 kernelinfo.o \
 init.o \
+exit.o \
 signal.o \
 $(CPU)/signal.o \
 $(CPU)/fork.o \

libmaxsi/exit.cpp

@@ -0,0 +1,62 @@
+/*******************************************************************************
+
+	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi 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 Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	exit.cpp
+	Hooks that is called upon process exit.
+
+*******************************************************************************/
+
+#include <stdlib.h>
+
+struct exithandler
+{
+	void (*hook)(int, void*);
+	void* param;
+	struct exithandler* next;
+}* exit_handler_stack = NULL;
+
+extern "C" int on_exit(void (*hook)(int, void*), void* param)
+{
+	struct exithandler* handler = (struct exithandler*) malloc(sizeof(struct exithandler));
+	if ( !handler ) { return -1; }
+	handler->hook = hook;
+	handler->param = param;
+	handler->next = exit_handler_stack;
+	exit_handler_stack = handler;
+	return 0;
+}
+
+static void atexit_adapter(int /*status*/, void* user)
+{
+	((void (*)(void)) user)();
+}
+
+extern "C" int atexit(void (*hook)(void))
+{
+	return on_exit(atexit_adapter, (void*) hook);
+}
+
+extern "C" void call_exit_handlers(int status)
+{
+	while ( exit_handler_stack )
+	{
+		exit_handler_stack->hook(status, exit_handler_stack->param);
+		exit_handler_stack = exit_handler_stack->next;
+	}
+}

libmaxsi/include/stdlib.h

@@ -49,6 +49,7 @@ typedef int div_t, ldiv_t, lldiv_t;
 
 void abort(void);
 int abs(int value);
+int atexit(void (*function)(void));
 int atoi(const char*);
 long atol(const char*);
 long long atoll(const char*);
@@ -62,6 +63,7 @@ void* malloc(size_t);
 #if !defined(_SORTIX_SOURCE)
 char* mktemp(char* templ);
 #endif
+int on_exit(void (*function)(int, void*), void* arg);
 int putenv(char*);
 void qsort(void*, size_t, size_t, int (*)(const void*, const void*));
 int rand(void);
@@ -93,7 +95,6 @@ int clearenv(void);
 /* TODO: These are not implemented in libmaxsi/sortix yet. */
 #if defined(__SORTIX_SHOW_UNIMPLEMENTED)
 long a64l(const char* s);
-int atexit(void (*function)(void));
 double atof(const char* value);
 void* bsearch(const void*, const void*, size_t, size_t, int (*)(const void*, const void*));
 div_t div(int, int);

libmaxsi/process.cpp

@@ -174,8 +174,11 @@ namespace Maxsi
 			return result;
 		}
 
+		extern "C" void call_exit_handlers(int status);
+
 		DUAL_FUNCTION(void, exit, Exit, (int status))
 		{
+			call_exit_handlers(status);
 			dcloseall();
 			fcloseall();
 			_exit(status);