Move __cxa_thread_atexit* to its own .c file to avoid pulling the code

(w/ _dlctl reference) into static executables.  It's all Mark's code so
put his preferred copyright on it.

ok kettenis@

1 files changed, 49 insertions, 0 deletions

diff --git a/src/lib/libc/stdlib/thread_atexit.c b/src/lib/libc/stdlib/thread_atexit.c
new file mode 100644
index 0000000000..2e00428eba
--- /dev/null
+++ b/src/lib/libc/stdlib/thread_atexit.c
@@ -0,0 +1,49 @@
+/*      $OpenBSD: thread_atexit.c,v 1.1 2017/12/16 20:06:56 guenther Exp $ */
+/*
+ * Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <dlfcn.h>
+#include <elf.h>
+#pragma weak _DYNAMIC
+#include <stdlib.h>
+#include <tib.h>
+
+#include "atexit.h"
+
+typeof(dlctl) dlctl asm("_dlctl") __attribute__((weak));
+
+__weak_alias(__cxa_thread_atexit, __cxa_thread_atexit_impl);
+
+int
+__cxa_thread_atexit_impl(void (*func)(void *), void *arg, void *dso)
+{
+        struct thread_atexit_fn *fnp;
+        struct tib *tib = TIB_GET();
+
+        fnp = calloc(1, sizeof(struct thread_atexit_fn));
+        if (fnp == NULL)
+                return -1;
+
+        if (_DYNAMIC)
+                dlctl(NULL, DL_REFERENCE, dso);
+
+        fnp->func = func;
+        fnp->arg = arg;
+        fnp->next = tib->tib_atexit;
+        tib->tib_atexit = fnp;
+
+        return 0;
+}