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-.\" Copyright (c) 1983, 1991, 1992, 1993
-.\"	The 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. 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
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-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)sigaltstack.2	8.2 (Berkeley) 5/1/95
-.\"	$Id: sigaltstack.2,v 1.7 1997/03/12 16:23:36 mpp Exp $
-.\"
-.Dd May 1, 1995
-.Dt SIGALTSTACK 2
-.Os BSD 4.2
-.Sh NAME
-.Nm sigaltstack
-.Nd set and/or get signal stack context
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <signal.h>
-.Bd -literal
-struct sigaltstack {
-	char	*ss_sp;
-	long	ss_size;
-	int     ss_flags;
-};
-.Ed
-.Ft int
-.Fn sigaltstack "const struct sigaltstack *ss" "struct sigaltstack *oss"
-.Sh DESCRIPTION
-.Fn Sigaltstack
-allows users to define an alternate stack on which signals
-are to be processed.
-If
-.Fa ss
-is non-zero,
-it specifies a pointer to and the size of a
-.Em "signal stack"
-on which to deliver signals,
-and tells the system if the process is currently executing
-on that stack.
-When a signal's action indicates its handler
-should execute on the signal stack (specified with a
-.Xr sigaction 2
-call), the system checks to see
-if the process is currently executing on that stack.
-If the process is not currently executing on the signal stack,
-the system arranges a switch to the signal stack for the
-duration of the signal handler's execution. 
-.Pp
-If
-.Dv SS_DISABLE
-is set in
-.Fa ss_flags ,
-.Fa ss_sp
-and
-.Fa ss_size
-are ignored and the signal stack will be disabled.
-Trying to disable an active stack will cause
-.Fn sigaltstack
-to return -1 with
-.Va errno
-set to
-.Dv EINVAL .
-A disabled stack will cause all signals to be
-taken on the regular user stack.
-If the stack is later re-enabled then all signals that were specified
-to be processed on an alternate stack will resume doing so.
-.Pp
-If
-.Fa oss
-is non-zero, the current signal stack state is returned.
-The
-.Fa ss_flags
-field will contain the value
-.Dv SS_ONSTACK
-if the process is currently on a signal stack and
-.Dv SS_DISABLE
-if the signal stack is currently disabled.
-.Sh NOTES
-The value
-.Dv SIGSTKSZ
-is defined to be the number of bytes/chars that would be used to cover
-the usual case when allocating an alternate stack area.
-The following code fragment is typically used to allocate an alternate stack.
-.Bd -literal -offset indent
-if ((sigstk.ss_sp = malloc(SIGSTKSZ)) == NULL)
-	/* error return */
-sigstk.ss_size = SIGSTKSZ;
-sigstk.ss_flags = 0;
-if (sigaltstack(&sigstk,0) < 0)
-	perror("sigaltstack");
-.Ed
-An alternative approach is provided for programs with signal handlers
-that require a specific amount of stack space other than the default size.
-The value
-.Dv MINSIGSTKSZ
-is defined to be the number of bytes/chars that is required by
-the operating system to implement the alternate stack feature.
-In computing an alternate stack size,
-programs should add
-.Dv MINSIGSTKSZ
-to their stack requirements to allow for the operating system overhead.
-.Pp
-Signal stacks are automatically adjusted for the direction of stack
-growth and alignment requirements.
-Signal stacks may or may not be protected by the hardware and
-are not ``grown'' automatically as is done for the normal stack.
-If the stack overflows and this space is not protected
-unpredictable results may occur.
-.Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, a value of -1 is returned and 
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Fn Sigstack
-will fail and the signal stack context will remain unchanged
-if one of the following occurs.
-.Bl -tag -width [ENOMEM]
-.It Bq Er EFAULT
-Either
-.Fa ss
-or
-.Fa oss
-points to memory that is not a valid part of the process
-address space.
-.It Bq Er EINVAL
-An attempt was made to disable an active stack.
-.It Bq Er ENOMEM
-Size of alternate stack area is less than or equal to
-.Dv MINSIGSTKSZ .
-.El
-.Sh SEE ALSO
-.Xr sigaction 2 ,
-.Xr setjmp 3
-.Sh HISTORY
-The predecessor to
-.Fn sigaltstack ,
-the
-.Fn sigstack
-system call, appeared in
-.Bx 4.2 .