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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "LONGJMP" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" longjmp 
+.SH NAME
+longjmp \- non-local goto
+.SH SYNOPSIS
+.LP
+\fB#include <setjmp.h>
+.br
+.sp
+void longjmp(jmp_buf\fP \fIenv\fP\fB, int\fP \fIval\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIlongjmp\fP() function shall restore the environment saved by
+the most recent invocation of \fIsetjmp\fP() in the same thread, with
+the corresponding \fBjmp_buf\fP argument. If there is no
+such invocation, or if the function containing the invocation of \fIsetjmp\fP()
+has
+terminated execution in the interim, or if the invocation of \fIsetjmp\fP()
+was within the
+scope of an identifier with variably modified type and execution has
+left that scope in the interim, the behavior is undefined.
+\ It is unspecified whether \fIlongjmp\fP() restores the signal mask,
+leaves the signal mask unchanged, or restores it to its
+value at the time \fIsetjmp\fP() was called. 
+.LP
+All accessible objects have values, and all other components of the
+abstract machine have state (for example, floating-point
+status flags and open files), as of the time \fIlongjmp\fP() was called,
+except that the values of objects of automatic storage
+duration are unspecified if they meet all the following conditions:
+.IP " *" 3
+They are local to the function containing the corresponding \fIsetjmp\fP()
+invocation.
+.LP
+.IP " *" 3
+They do not have volatile-qualified type.
+.LP
+.IP " *" 3
+They are changed between the \fIsetjmp\fP() invocation and \fIlongjmp\fP()
+call.
+.LP
+.LP
+As
+it bypasses the usual function call and return mechanisms, \fIlongjmp\fP()
+shall execute correctly in contexts of interrupts,
+signals, and any of their associated functions. However, if \fIlongjmp\fP()
+is invoked from a nested signal handler (that is, from
+a function invoked as a result of a signal raised during the handling
+of another signal), the behavior is undefined.
+.LP
+The effect of a call to \fIlongjmp\fP() where initialization of the
+\fBjmp_buf\fP structure was not performed in the calling
+thread is undefined. 
+.SH RETURN VALUE
+.LP
+After \fIlongjmp\fP() is completed, program execution continues as
+if the corresponding invocation of \fIsetjmp\fP() had just returned
+the value specified by \fIval\fP. The \fIlongjmp\fP() function
+shall not cause \fIsetjmp\fP() to return 0; if \fIval\fP is 0, \fIsetjmp\fP()
+shall return 1.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Applications whose behavior depends on the value of the signal mask
+should not use \fIlongjmp\fP() and \fIsetjmp\fP(), since their effect
+on the signal mask is unspecified, but should instead use the \fIsiglongjmp\fP()
+and \fIsigsetjmp\fP()
+functions (which can save and restore the signal mask under application
+control).
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIsetjmp\fP() , \fIsigaction\fP() , \fIsiglongjmp\fP() , \fIsigsetjmp\fP()
+, the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<setjmp.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version 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 .