add skeleton of things from C11

1 files changed, 54 insertions, 0 deletions

diff --git a/src/stdlib/at_quick_exit.c b/src/stdlib/at_quick_exit.c
new file mode 100644
index 00000000..01127d4e
--- /dev/null
+++ b/src/stdlib/at_quick_exit.c
@@ -0,0 +1,54 @@
+#include <stdlib.h>
+#include <limits.h>
+#include <errno.h>
+#include "_stdlib.h"
+
+/** register a function to run at quick exit **/
+int at_quick_exit(void (*func)(void))
+{
+	__C_MIN(201112L);
+	if (__stdlib.nat_quick_exit >= ATEXIT_MAX) {
+		return 1;
+	}
+
+	if (__stdlib.at_quick_exit == NULL) {
+		__stdlib.at_quick_exit = calloc(1,
+			sizeof(*__stdlib.at_quick_exit));
+		if (__stdlib.at_quick_exit == NULL) {
+			errno = ENOMEM;
+			return 1;
+		}
+		__stdlib.at_quick_exit->fn = func;
+		__stdlib.nat_quick_exit = 1;
+		return 0;
+	}
+
+	__stdlib.at_quick_exit->next = calloc(1,
+		sizeof(*__stdlib.at_quick_exit->next));
+	if (__stdlib.at_quick_exit->next == NULL) {
+		errno = ENOMEM;
+		return 1;
+	}
+	__stdlib.at_quick_exit->next->fn = func;
+	__stdlib.at_quick_exit->next->prev = __stdlib.at_quick_exit;
+	__stdlib.at_quick_exit = __stdlib.at_quick_exit->next;
+	__stdlib.nat_quick_exit++;
+
+	return 0;
+}
+
+/***
+The fn(at_quick_exit) registers the function arg(func) to be called when the
+program exits via fn(quick_exit). The function must take no parameters.
+***/
+
+/* UNSPECIFIED: - */
+/* UNDEFINED: - */
+/* IMPLEMENTATION: the number of registrations allowed (at least 32) */
+/* LOCALE: - */
+
+/* RETURN(0): success */
+/* RETURN(NZ): failure */
+/*
+STDC(201112)
+*/