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_LONGJMP(3P)               POSIX Programmer's Manual              _LONGJMP(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       _longjmp, _setjmp - non-local goto

SYNOPSIS
       #include <setjmp.h>

       void _longjmp(jmp_buf env, int val);
       int _setjmp(jmp_buf env);


DESCRIPTION
       The  _longjmp()  and  _setjmp() functions shall be equivalent to longjmp() and setjmp(), respectively, with the
       additional restriction that _longjmp() and _setjmp() shall not manipulate the signal mask.

       If _longjmp() is called even though env was never initialized by a call to _setjmp(), or  when  the  last  such
       call was in a function that has since returned, the results are undefined.

RETURN VALUE
       Refer to longjmp() and setjmp().

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       If  _longjmp()  is  executed  and  the environment in which _setjmp() was executed no longer exists, errors can
       occur.  The conditions under which the environment of the _setjmp() no longer exists include exiting the  func-
       tion that contains the _setjmp() call, and exiting an inner block with temporary storage.  This condition might
       not be detectable, in which case the _longjmp() 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 pro-
       cess termination. If the function has returned, the results are undefined.

       Passing longjmp() a pointer to a buffer not created by setjmp(), passing _longjmp() a pointer to a  buffer  not
       created  by _setjmp(), passing siglongjmp() a pointer to a buffer not created by sigsetjmp(), 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.

       The  _longjmp()  and  _setjmp()  functions are included to support programs written to historical system inter-
       faces.  New applications should use siglongjmp() and sigsetjmp() respectively.

RATIONALE
       None.

FUTURE DIRECTIONS
       The _longjmp() and _setjmp() functions may be marked LEGACY in a future version.

SEE ALSO
       longjmp(), setjmp(), siglongjmp(), sigsetjmp(), the Base Definitions volume of IEEE Std 1003.1-2001, <setjmp.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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 .



IEEE/The Open Group                  2003                         _LONGJMP(3P)