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diff --git a/9/platforms/android-21/arch-x86/usr/include/signal.h b/9/platforms/android-21/arch-x86/usr/include/signal.h
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+++ b/9/platforms/android-21/arch-x86/usr/include/signal.h
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ */
+
+#ifndef _SIGNAL_H_
+#define _SIGNAL_H_
+
+#include <errno.h>
+#include <sys/cdefs.h>
+#include <limits.h> /* For LONG_BIT */
+#include <string.h> /* For memset() */
+#include <sys/types.h>
+#include <asm/sigcontext.h>
+
+#if defined(__LP64__) || defined(__mips__)
+/* For 64-bit (and mips), the kernel's struct sigaction doesn't match the POSIX one,
+ * so we need to expose our own and translate behind the scenes. */
+# define sigaction __kernel_sigaction
+# include <linux/signal.h>
+# undef sigaction
+#else
+/* For 32-bit, we're stuck with the definitions we already shipped,
+ * even though they contain a sigset_t that's too small. */
+# include <linux/signal.h>
+#endif
+
+#include <sys/ucontext.h>
+#define __BIONIC_HAVE_UCONTEXT_T
+
+__BEGIN_DECLS
+
+typedef int sig_atomic_t;
+
+/* The arm and x86 kernel header files don't define _NSIG. */
+#ifndef _KERNEL__NSIG
+#define _KERNEL__NSIG 64
+#endif
+
+/* Userspace's NSIG is the kernel's _NSIG + 1. */
+#define _NSIG (_KERNEL__NSIG + 1)
+#define NSIG _NSIG
+
+/* We take a few real-time signals for ourselves. May as well use the same names as glibc. */
+#define SIGRTMIN (__libc_current_sigrtmin())
+#define SIGRTMAX (__libc_current_sigrtmax())
+extern int __libc_current_sigrtmin(void);
+extern int __libc_current_sigrtmax(void);
+
+extern const char* const sys_siglist[];
+extern const char* const sys_signame[]; /* BSD compatibility. */
+
+typedef __sighandler_t sig_t; /* BSD compatibility. */
+typedef __sighandler_t sighandler_t; /* glibc compatibility. */
+
+#define si_timerid si_tid /* glibc compatibility. */
+
+#if defined(__LP64__)
+
+struct sigaction {
+ unsigned int sa_flags;
+ union {
+ sighandler_t sa_handler;
+ void (*sa_sigaction)(int, struct siginfo*, void*);
+ };
+ sigset_t sa_mask;
+ void (*sa_restorer)(void);
+};
+
+#elif defined(__mips__)
+
+struct sigaction {
+ unsigned int sa_flags;
+ union {
+ sighandler_t sa_handler;
+ void (*sa_sigaction) (int, struct siginfo*, void*);
+ };
+ sigset_t sa_mask;
+};
+
+#endif
+
+extern int sigaction(int, const struct sigaction*, struct sigaction*);
+
+extern sighandler_t signal(int, sighandler_t);
+
+extern int siginterrupt(int, int);
+
+extern int sigaddset(sigset_t*, int);
+extern int sigdelset(sigset_t*, int);
+extern int sigemptyset(sigset_t*);
+extern int sigfillset(sigset_t*);
+extern int sigismember(const sigset_t*, int);
+
+extern int sigpending(sigset_t*) __nonnull((1));
+extern int sigprocmask(int, const sigset_t*, sigset_t*);
+extern int sigsuspend(const sigset_t*) __nonnull((1));
+extern int sigwait(const sigset_t*, int*) __nonnull((1, 2));
+
+extern int raise(int);
+extern int kill(pid_t, int);
+extern int killpg(int, int);
+
+extern int sigaltstack(const stack_t*, stack_t*);
+
+extern void psiginfo(const siginfo_t*, const char*);
+extern void psignal(int, const char*);
+
+__END_DECLS
+
+#endif /* _SIGNAL_H_ */