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.\"
.\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for
.\" permission to reproduce portions of its copyrighted documentation.
.\" Original documentation from The Open Group can be obtained online at
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.\"
.\" The Institute of Electrical and Electronics Engineers and The Open
.\" Group, have given us permission to reprint portions of their
.\" documentation.
.\"
.\" In the following statement, the phrase ``this text'' refers to portions
.\" of the system documentation.
.\"
.\" Portions of this text are reprinted and reproduced in electronic form
.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition,
.\" Standard for Information Technology -- Portable Operating System
.\" Interface (POSIX), The Open Group Base Specifications Issue 6,
.\" Copyright (C) 2001-2004 by the Institute of Electrical and Electronics
.\" Engineers, Inc and The Open Group. In the event of any discrepancy
.\" between these versions and the original IEEE and The Open Group
.\" Standard, the original IEEE and The Open Group Standard is the referee
.\" document. The original Standard can be obtained online at
.\" http://www.opengroup.org/unix/online.html.
.\"
.\" This notice shall appear on any product containing this material.
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
.\" and limitations under the License.
.\"
.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
.\"
.\"
.\" Copyright (c) 1994, X/Open Company Limited. All Rights Reserved.
.\" Portions Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved
.\"
.TH _LONGJMP 3C "Jul 24, 2002"
.SH NAME
_longjmp, _setjmp \- non-local goto
.SH SYNOPSIS
.LP
.nf
#include <setjmp.h>
\fBvoid\fR \fB_longjmp\fR(\fBjmp_buf\fR \fIenv\fR, \fBint\fR \fIval\fR);
.fi
.LP
.nf
\fBint\fR \fB_setjmp\fR(\fBjmp_buf\fR \fIenv\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fB_longjmp()\fR and \fB_setjmp()\fR functions are identical to
\fBlongjmp\fR(3C) and \fBsetjmp\fR(3C), respectively, with the additional
restriction that \fB_longjmp()\fR and \fB_setjmp()\fR do not manipulate the
signal mask.
.sp
.LP
If \fB_longjmp()\fR is called even though \fBenv\fR was never initialized by a
call to \fB_setjmp()\fR, or when the last such call was in a function that has
since returned, the results are undefined.
.SH RETURN VALUES
.sp
.LP
Refer to \fBlongjmp\fR(3C) and \fBsetjmp\fR(3C).
.SH ERRORS
.sp
.LP
No errors are defined.
.SH USAGE
.sp
.LP
If \fB_longjmp()\fR is executed and the environment in which \fB_setjmp()\fR
was executed no longer exists, errors can occur. The conditions under which the
environment of the \fB_setjmp()\fR no longer exists include exiting the
function that contains the \fB_setjmp()\fR call, and exiting an inner block
with temporary storage. This condition might not be detectable, in which case
the \fB_longjmp()\fR occurs and, if the environment no longer exists, the
contents of the temporary storage of an inner block are unpredictable. This
condition might also cause unexpected process termination. If the function has
returned, the results are undefined.
.sp
.LP
Passing \fBlongjmp()\fR a pointer to a buffer not created by \fBsetjmp(\|),\fR
passing \fB_longjmp()\fR a pointer to a buffer not created by \fB_setjmp()\fR,
passing \fBsiglongjmp\fR(3C) a pointer to a buffer not created by
\fBsigsetjmp\fR(3C) or passing any of these three functions a buffer that has
been modified by the user can cause all the problems listed above, and more.
.sp
.LP
The \fB_longjmp()\fR and \fB_setjmp()\fR functions are included to support
programs written to historical system interfaces. New applications should use
\fBsiglongjmp\fR(3C) and \fBsigsetjmp\fR(3C) respectively.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Standard
.TE
.SH SEE ALSO
.sp
.LP
\fBlongjmp\fR(3C), \fBsetjmp\fR(3C), \fBsiglongjmp\fR(3C), \fBsigsetjmp\fR(3C),
\fBattributes\fR(5), \fBstandards\fR(5)
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