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e1f4e80c88
in the main text of various man pages. Thanks to Warner Losh for adding an option to manck to allow it to scan the entire man page looking for bogus xrefs, instead of just checking the SEE ALSO section.
174 lines
4.7 KiB
Groff
174 lines
4.7 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)setjmp.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt SETJMP 3
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.Os BSD 4
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.Sh NAME
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.Nm sigsetjmp ,
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.Nm siglongjmp ,
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.Nm setjmp ,
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.Nm longjmp ,
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.Nm _setjmp ,
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.Nm _longjmp ,
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.Nm longjmperror
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.Nd non-local jumps
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.Sh SYNOPSIS
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.Fd #include <setjmp.h>
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.Ft int
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.Fn sigsetjmp "sigjmp_buf env" "int savemask"
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.Ft void
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.Fn siglongjmp "sigjmp_buf env" "int val"
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.Ft int
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.Fn setjmp "jmp_buf env"
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.Ft void
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.Fn longjmp "jmp_buf env" "int val"
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.Ft int
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.Fn _setjmp "jmp_buf env"
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.Ft void
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.Fn _longjmp "jmp_buf env" "int val"
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.Ft void
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.Fn longjmperror void
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.Sh DESCRIPTION
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The
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.Fn sigsetjmp ,
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.Fn setjmp ,
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and
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.Fn _setjmp
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functions save their calling environment in
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.Fa env .
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Each of these functions returns 0.
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.Pp
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The corresponding
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.Fn longjmp
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functions restore the environment saved by their most recent respective
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invocations
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of the
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.Fn setjmp
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function.
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They then return so that program execution continues as if the corresponding
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invocation of the
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.Fn setjmp
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call had just returned the value specified by
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.Fa val ,
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instead of 0.
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.Pp
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Pairs of calls may be intermixed, i.e. both
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.Fn sigsetjmp
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and
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.Fn siglongjmp
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and
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.Fn setjmp
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and
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.Fn longjmp
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combinations may be used in the same program, however, individual
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calls may not, e.g. the
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.Fa env
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argument to
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.Fn setjmp
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may not be passed to
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.Fn siglongjmp .
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.Pp
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The
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.Fn longjmp
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routines may not be called after the routine which called the
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.Fn setjmp
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routines returns.
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.Pp
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All accessible objects have values as of the time
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.Fn longjmp
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routine was called, except that the values of objects of automatic storage
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invocation duration that do not have the
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.Em volatile
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type and have been changed between the
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.Fn setjmp
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invocation and
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.Fn longjmp
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call are indeterminate.
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.Pp
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The
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.Fn setjmp Ns / Ns Fn longjmp
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pairs save and restore the signal mask while
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.Fn _setjmp Ns / Ns Fn _longjmp
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pairs save and restore only the register set and the stack.
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(See
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.Fn sigprocmask 2 . )
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.Pp
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The
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.Fn sigsetjmp Ns / Ns Fn siglongjmp
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function
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pairs save and restore the signal mask if the argument
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.Fa savemask
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is non-zero, otherwise only the register set and the stack are saved.
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.Sh ERRORS
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If the contents of the
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.Fa env
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are corrupted, or correspond to an environment that has already returned,
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the
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.Fn longjmp
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routine calls the routine
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.Fn longjmperror 3 .
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If
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.Fn longjmperror
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returns the program is aborted (see
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.Xr abort 3 ) .
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The default version of
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.Fn longjmperror
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prints the message
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.Dq Li longjmp botch
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to standard error and returns.
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User programs wishing to exit more gracefully should write their own
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versions of
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.Fn longjmperror .
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.Sh SEE ALSO
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.Xr sigaction 2 ,
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.Xr sigaltstack 2 ,
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.Xr signal 3
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.Sh STANDARDS
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The
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.Fn setjmp
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and
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.Fn longjmp
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functions conform to
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.St -ansiC .
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The
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.Fn sigsetjmp
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and
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.Fn siglongjmp
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functions conform to
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.St -p1003.1-88 .
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