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-.\" Copyright (c) 1985, 1991, 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. 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.
-.\"
-.\"     @(#)sigreturn.2	8.1 (Berkeley) 6/4/93
-.\"
-.Dd September 6, 2013
-.Dt SIGRETURN 2
-.Os
-.Sh NAME
-.Nm sigreturn
-.Nd return from signal
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In signal.h
-.Ft int
-.Fn sigreturn "const ucontext_t *scp"
-.Sh DESCRIPTION
-The
-.Fn sigreturn
-system call
-allows users to atomically unmask, switch stacks,
-and return from a signal context.
-The thread's signal mask and stack status are
-restored from the context structure pointed to by
-.Fa scp .
-The system call does not return;
-the users stack pointer, frame pointer, argument pointer,
-and processor status longword are restored from the context.
-Execution resumes at the specified pc.
-This system call is used by the trampoline code and
-.Xr longjmp 3
-when returning from a signal to the previously executing program.
-.Sh RETURN VALUES
-If successful, the system call does not return.
-Otherwise, a value of -1 is returned and
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn sigreturn
-system call
-will fail and the thread context will remain unchanged
-if one of the following occurs.
-.Bl -tag -width Er
-.It Bq Er EFAULT
-The
-.Fa scp
-argument
-points to memory that is not a valid part of the process
-address space.
-.It Bq Er EINVAL
-The process status longword is invalid or would improperly
-raise the privilege level of the process.
-.El
-.Sh SEE ALSO
-.Xr sigaction 2 ,
-.Xr setjmp 3 ,
-.Xr ucontext 3
-.Sh HISTORY
-The
-.Fn sigreturn
-system call appeared in
-.Bx 4.3 .