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Revision 1.3, Wed Apr 30 13:10:53 2008 UTC (14 years, 2 months ago) by martin
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.\" $NetBSD: ucontext.2,v 1.3 2008/04/30 13:10:53 martin Exp $ .\" .\" Copyright (c) 2001 The NetBSD Foundation, Inc. .\" All rights reserved. .\" .\" This code is derived from software contributed to The NetBSD Foundation .\" by Klaus Klein. .\" .\" 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. .\" .\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. .\" .Dd June 13, 2001 .Dt UCONTEXT 2 .Os .Sh NAME .Nm ucontext .Nd user context .Sh SYNOPSIS .In ucontext.h .Sh DESCRIPTION .Nm ucontext_t is a structure type which is used to describe the context of a thread of control within the execution of a process. .Pp .Nm ucontext_t includes the following members: .Bd -literal -offset indent ucontext_t * uc_link sigset_t uc_sigmask stack_t uc_stack mcontext_t uc_mcontext .Ed .Pp The .Fa uc_link member points to the context that will be resumed after the function specified when modifying a context using .Xr makecontext 3 has returned. If .Fa uc_link is a null pointer, then the context is the main context, and the process will exit with an exit status of 0 upon return. .Pp The .Fa uc_sigmask member is the set of signals that are blocked when the context is activated. Further information can be found in .Xr sigprocmask 2 . .Pp The .Fa uc_stack member defines the stack used by the context. Further information can be found in .Xr sigaltstack 2 . .Pp The .Fa uc_mcontext member defines the machine state associated with the context; it may consist of general registers, floating point registers and other machine-specific information. Its description is beyond the scope of this manual page; portable applications should not access this structure member. .Sh SEE ALSO .Xr _exit 2 , .Xr getcontext 2 , .Xr setcontext 2 , .Xr sigaltstack 2 , .Xr sigprocmask 2 , .Xr makecontext 3 , .Xr swapcontext 3 .Sh STANDARDS The .Nm ucontext_t type conforms to .St -xsh5 . .Sh HISTORY The .Fn makecontext and .Fn swapcontext functions first appeared in .At V.4 .