scc

commit 3ddba6b6ed93c63e246397e08acdc39a2e1744a9
parent e35b235d743259f6fbacd4037aab735d3e39dca3
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Tue,  7 Mar 2017 20:31:56 +0100

[libc] Fix exit()

The functions registered at atexit() must be called in reverse
order. This patch also protect against calling exit() from
some of the atexit handler.

Diffstat:
M
libc/src/exit.c
 | 
9
+++++++--

1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/libc/src/exit.c b/libc/src/exit.c
@@ -9,8 +9,13 @@ void
 exit(int status)
 {
 	void (**bp)(void);
+	int i;
 
-	for (bp = _atexitf; bp < &_atexitf[_ATEXIT_MAX] && *bp; ++bp)
-		(*bp)();
+	for (i = _ATEXIT_MAX-1; i >= 0; --i) {
+		if (bp = _atexit[i]) {
+			*_atexit[i] = NULL;
+			(*bp)();
+		}
+	}
 	_Exit(status);
 }