+++ /dev/null
-.\" Copyright (c) 1990, 1991, 1993
-.\" The Regents of the University of California. All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" 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.
-.\"
-.\" @(#)setjmp.3 8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/gen/setjmp.3,v 1.9 2001/10/01 16:08:51 ru Exp $
-.\"
-.Dd June 4, 1993
-.Dt SETJMP 3
-.Os
-.Sh NAME
-.Nm _longjmp ,
-.Nm _setjmp ,
-.Nm longjmp ,
-.Nm longjmperror ,
-.Nm setjmp ,
-.Nm siglongjmp ,
-.Nm sigsetjmp
-.Nd non-local jumps
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In setjmp.h
-.Ft void
-.Fo _longjmp
-.Fa "jmp_buf env"
-.Fa "int val"
-.Fc
-.Ft int
-.Fo _setjmp
-.Fa "jmp_buf env"
-.Fc
-.Ft void
-.Fo longjmp
-.Fa "jmp_buf env"
-.Fa "int val"
-.Fc
-.Ft void
-.Fo longjmperror
-.Fa void
-.Fc
-.Ft int
-.Fo setjmp
-.Fa "jmp_buf env"
-.Fc
-.Ft void
-.Fo siglongjmp
-.Fa "sigjmp_buf env"
-.Fa "int val"
-.Fc
-.Ft int
-.Fo sigsetjmp
-.Fa "sigjmp_buf env"
-.Fa "int savemask"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn sigsetjmp ,
-.Fn setjmp ,
-and
-.Fn _setjmp
-functions save their calling environment in
-.Fa env .
-Each of these functions returns 0.
-.Pp
-The corresponding
-.Fn longjmp
-functions restore the environment saved by their most recent respective
-invocations
-of the
-.Fn setjmp
-function.
-They then return, so that program execution continues
-as if the corresponding invocation of the
-.Fn setjmp
-call had just returned the value specified by
-.Fa val ,
-instead of 0.
-.Pp
-Pairs of calls may be intermixed
-(i.e., both
-.Fn sigsetjmp
-and
-.Fn siglongjmp
-and
-.Fn setjmp
-and
-.Fn longjmp
-combinations may be used in the same program); however, individual
-calls may not (e.g. the
-.Fa env
-argument to
-.Fn setjmp
-may not be passed to
-.Fn siglongjmp ) .
-.Pp
-The
-.Fn longjmp
-routines may not be called after the routine which called the
-.Fn setjmp
-routines returns.
-.Pp
-All accessible objects have values as of the time
-.Fn longjmp
-routine was called, except that the values of objects of automatic storage
-invocation duration that do not have the
-.Em volatile
-type and have been changed between the
-.Fn setjmp
-invocation and
-.Fn longjmp
-call are indeterminate.
-.Pp
-The
-.Fn setjmp Ns / Ns Fn longjmp
-pairs save and restore the signal mask while
-.Fn _setjmp Ns / Ns Fn _longjmp
-pairs save and restore only the register set and the stack.
-(See
-.Fn sigprocmask 2 . )
-.Pp
-The
-.Fn sigsetjmp Ns / Ns Fn siglongjmp
-function
-pairs save and restore the signal mask if the argument
-.Fa savemask
-is non-zero; otherwise, only the register set and the stack are saved.
-.Sh ERRORS
-If the contents of the
-.Fa env
-are corrupted, or correspond to an environment that has already returned,
-the
-.Fn longjmp
-routine calls the routine
-.Fn longjmperror 3 .
-If
-.Fn longjmperror
-returns, the program is aborted (see
-.Xr abort 3 ) .
-The default version of
-.Fn longjmperror
-prints the message
-.Dq Li longjmp botch
-to standard error and returns.
-User programs wishing to exit more gracefully should write their own
-versions of
-.Fn longjmperror .
-.Sh SEE ALSO
-.Xr sigaction 2 ,
-.Xr sigaltstack 2 ,
-.Xr signal 3
-.Sh STANDARDS
-The
-.Fn setjmp
-and
-.Fn longjmp
-functions conform to
-.St -isoC .
-The
-.Fn sigsetjmp
-and
-.Fn siglongjmp
-functions conform to
-.St -p1003.1-88 .
projects / apple / libc.git / blobdiff