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diff --git a/include/mach/sa/sys/signal.h b/include/mach/sa/sys/signal.h
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+/*
+ * Copyright (c) 1982, 1986, 1989, 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ *	@(#)signal.h	8.2 (Berkeley) 1/21/94
+ * signal.h,v 1.2 1994/08/02 07:53:32 davidg Exp
+ */
+
+#ifndef	_MACH_SA_SYS_SIGNAL_H_
+#define	_MACH_SA_SYS_SIGNAL_H_
+
+#define NSIG	32		/* counting 0; could be 33 (mask is 1-32) */
+
+#define	SIGHUP	1	/* hangup */
+#define	SIGINT	2	/* interrupt */
+#define	SIGQUIT	3	/* quit */
+#define	SIGILL	4	/* illegal instruction (not reset when caught) */
+#ifndef _POSIX_SOURCE
+#define	SIGTRAP	5	/* trace trap (not reset when caught) */
+#endif
+#define	SIGABRT	6	/* abort() */
+#ifndef _POSIX_SOURCE
+#define	SIGIOT	SIGABRT	/* compatibility */
+#define	SIGEMT	7	/* EMT instruction */
+#endif
+#define	SIGFPE	8	/* floating point exception */
+#define	SIGKILL	9	/* kill (cannot be caught or ignored) */
+#ifndef _POSIX_SOURCE
+#define	SIGBUS	10	/* bus error */
+#endif
+#define	SIGSEGV	11	/* segmentation violation */
+#ifndef _POSIX_SOURCE
+#define	SIGSYS	12	/* bad argument to system call */
+#endif
+#define	SIGPIPE	13	/* write on a pipe with no one to read it */
+#define	SIGALRM	14	/* alarm clock */
+#define	SIGTERM	15	/* software termination signal from kill */
+#ifndef _POSIX_SOURCE
+#define	SIGURG	16	/* urgent condition on IO channel */
+#endif
+#define	SIGSTOP	17	/* sendable stop signal not from tty */
+#define	SIGTSTP	18	/* stop signal from tty */
+#define	SIGCONT	19	/* continue a stopped process */
+#define	SIGCHLD	20	/* to parent on child stop or exit */
+#define	SIGTTIN	21	/* to readers pgrp upon background tty read */
+#define	SIGTTOU	22	/* like TTIN for output if (tp->t_local&LTOSTOP) */
+#ifndef _POSIX_SOURCE
+#define	SIGIO	23	/* input/output possible signal */
+#define	SIGXCPU	24	/* exceeded CPU time limit */
+#define	SIGXFSZ	25	/* exceeded file size limit */
+#define	SIGVTALRM 26	/* virtual time alarm */
+#define	SIGPROF	27	/* profiling time alarm */
+#define SIGWINCH 28	/* window size changes */
+#define SIGINFO	29	/* information request */
+#endif
+#define SIGUSR1 30	/* user defined signal 1 */
+#define SIGUSR2 31	/* user defined signal 2 */
+
+#if defined(_ANSI_SOURCE) || defined(__cplusplus)
+/*
+ * Language spec sez we must list exactly one parameter, even though we
+ * actually supply three.  Ugh!
+ */
+#define	SIG_DFL		(void (*)(int))0
+#define	SIG_IGN		(void (*)(int))1
+#define	SIG_ERR		(void (*)(int))-1
+#else
+#define	SIG_DFL		(void (*)())0
+#define	SIG_IGN		(void (*)())1
+#define	SIG_ERR		(void (*)())-1
+#endif
+
+#ifndef _ANSI_SOURCE
+
+typedef unsigned int sigset_t;
+
+/*
+ * POSIX 1003.1b: Generic value to pass back to an application.
+ */
+union sigval
+{
+	int	sival_int;
+	void	*sival_ptr;
+};
+
+/*
+ * This structure is passed to signal handlers
+ * that use the new SA_SIGINFO calling convention (see below).
+ */
+typedef struct
+{
+	int		si_signo;
+	int		si_code;
+	union sigval	si_value;
+} siginfo_t;
+
+/* Values for si_code, indicating the source of the signal */
+#define SI_USER		0	/* sent by kill(), raise(), or abort() */
+#define SI_QUEUE	1	/* sent by sigqueue() */
+#define SI_TIMER	2	/* generated by an expired timer */
+#define SI_ASYNCIO	3	/* generated by completion of an async i/o */
+#define SI_MESGQ	4	/* generated by the arrival of a message */
+#define SI_IRQ		5	/* hardware int dispatched to application */
+
+/*
+ * Signal vector "template" used in sigaction call.
+ */
+struct	sigaction {
+	union {				/* signal handler */
+		void	(*sa_u_handler)();
+		void	(*sa_u_sigaction)(int, siginfo_t *, void *);
+	} sa_u;
+	sigset_t sa_mask;		/* signal mask to apply */
+	int	sa_flags;		/* see signal options below */
+};
+#define sa_handler	sa_u.sa_u_handler
+#define sa_sigaction	sa_u.sa_u_sigaction
+
+#ifndef _POSIX_SOURCE
+#define SA_ONSTACK	0x0001	/* take signal on signal stack */
+#define SA_RESTART	0x0002	/* restart system on signal return */
+#define	SA_DISABLE	0x0004	/* disable taking signals on alternate stack */
+#ifdef COMPAT_SUNOS
+#define	SA_USERTRAMP	0x0100	/* do not bounce off kernel's sigtramp */
+#endif
+#endif
+#define SA_NOCLDSTOP	0x0008	/* do not generate SIGCHLD on child stop */
+#define SA_SIGINFO	0x0010	/* use sa_sigaction calling convention */
+
+/*
+ * Flags for sigprocmask:
+ */
+#define	SIG_BLOCK	1	/* block specified signal set */
+#define	SIG_UNBLOCK	2	/* unblock specified signal set */
+#define	SIG_SETMASK	3	/* set specified signal set */
+
+/*
+ * POSIX 1003.1b:
+ * Used when requesting queued notification of an event,
+ * such as a timer expiration or a message arrival.
+ */
+struct sigevent
+{
+	int		sigev_notify;
+	union
+	{
+		struct
+		{
+			int		__signo;
+			union sigval	__value;
+		} __sig;
+		struct
+		{
+			void		(*__handler)(void);
+			void		*__stack;
+		} __fastint;
+	} __u;
+};
+
+#define sigev_signo	__u.__sig.__signo
+#define sigev_value	__u.__sig.__value
+
+#define sigev_handler	__u.__fastint.__handler
+#define sigev_stack	__u.__fastint.__stack
+
+/* Values for sigev_notify */
+#define SIGEV_NONE	0
+#define SIGEV_SIGNAL	1
+#define SIGEV_FASTINT	2
+
+#endif	/* !_ANSI_SOURCE */
+
+#endif	/* !_MACH_SA_SYS_SIGNAL_H_ */