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[libc] Add exit() and atexit()

--- a/libc/include/stdlib.h

+++ b/libc/include/stdlib.h

@@ -8,6 +8,8 @@

 #define NULL ((void *) 0)

 #endif

+#define _ATEXIT_MAX 32

+

 #define MB_CUR_MAX 1

 #define RAND_MAX 32767

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -10,7 +10,7 @@

           isalnum.o isalpha.o isascii.o isblank.o iscntrl.o isdigit.o \

           isgraph.o islower.o isprint.o ispunct.o isspace.o isupper.o \

           isxdigit.o toupper.o tolower.o ctype.o setlocale.o \

-          localeconv.o atoi.o

+          localeconv.o atoi.o atexit.o exit.o

 all: libc.a

--- /dev/null

+++ b/libc/src/atexit.c

@@ -1,0 +1,18 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <stdlib.h>

+

+extern void (*_atexitf[_ATEXIT_MAX])(void);

+

+int

+atexit(void (*fun)(void))

+{

+	void (**bp)(void);

+

+	for (bp = _atexitf; bp < &_atexitf[_ATEXIT_MAX] && *bp; ++bp)

+		/* nothing */;

+	if (bp == &_atexitf[_ATEXIT_MAX])

+		return 0;

+	*bp = fun;

+	return 1;

+}

--- /dev/null

+++ b/libc/src/exit.c

@@ -1,0 +1,15 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <stdlib.h>

+

+void (*_atexitf[_ATEXIT_MAX])(void);

+

+void

+exit(int status)

+{

+	void (**bp)(void);

+

+	for (bp = _atexitf; bp < &_atexitf[_ATEXIT_MAX] && *bp; ++bp)

+		(*bp)();

+	_Exit();

+}