auto import from //depot/cupcake/@135843
diff --git a/libc/unistd/abort.c b/libc/unistd/abort.c
new file mode 100644
index 0000000..d4e40e1
--- /dev/null
+++ b/libc/unistd/abort.c
@@ -0,0 +1,101 @@
+/* $OpenBSD: abort.c,v 1.14 2005/08/08 08:05:36 espie Exp $ */
+/*
+ * Copyright (c) 1985 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "thread_private.h"
+#include "atexit.h"
+
+/* temporary, for bug hunting */
+#include "logd.h"
+#define debug_log(format, ...) \
+ __libc_android_log_print(ANDROID_LOG_DEBUG, "libc-abort", (format), ##__VA_ARGS__ )
+
+void
+abort(void)
+{
+ struct atexit *p = __atexit;
+ static int cleanup_called = 0;
+ sigset_t mask;
+
+
+ sigfillset(&mask);
+ /*
+ * don't block SIGABRT to give any handler a chance; we ignore
+ * any errors -- X311J doesn't allow abort to return anyway.
+ */
+ sigdelset(&mask, SIGABRT);
+ /* temporary, so deliberate seg fault can be caught by debuggerd */
+ sigdelset(&mask, SIGSEGV);
+ /* -- */
+ (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
+
+ /*
+ * POSIX requires we flush stdio buffers on abort
+ */
+ if (cleanup_called == 0) {
+ while (p != NULL && p->next != NULL)
+ p = p->next;
+ /* the check for fn_dso == NULL is mostly paranoia */
+ if (p != NULL && p->fns[0].fn_dso == NULL &&
+ p->fns[0].fn_ptr.std_func != NULL) {
+ cleanup_called = 1;
+ (*p->fns[0].fn_ptr.std_func)();
+ }
+ }
+
+ /* temporary, for bug hunting */
+ debug_log("abort() called in pid %d\n", getpid());
+ /* seg fault seems to produce better debuggerd results than SIGABRT */
+ *((char*)0xdeadbaad) = 39;
+ debug_log("somehow we're not dead?\n");
+ /* -- */
+
+ (void)kill(getpid(), SIGABRT);
+
+ /*
+ * if SIGABRT ignored, or caught and the handler returns, do
+ * it again, only harder.
+ */
+ {
+ struct sigaction sa;
+
+ sa.sa_handler = SIG_DFL;
+ sa.sa_flags = SA_RESTART;
+ sigemptyset(&sa.sa_mask);
+
+ (void)sigaction( SIGABRT, &sa, &sa );
+ }
+
+ (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
+ (void)kill(getpid(), SIGABRT);
+ _exit(1);
+}