_longjmp(3p) — Linux manual page


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

PROLOG         top

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

NAME         top

       _longjmp, _setjmp — non-local goto

SYNOPSIS         top

       #include <setjmp.h>

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

DESCRIPTION         top

       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         top

       Refer to longjmp(3p) and setjmp(3p).

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top



       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 function 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 process 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 interfaces. New applications
       should use siglongjmp() and sigsetjmp() respectively.

RATIONALE         top



       The _longjmp() and _setjmp() functions may be removed in a future

SEE ALSO         top

       longjmp(3p), setjmp(3p), siglongjmp(3p), sigsetjmp(3p)

       The Base Definitions volume of POSIX.1‐2008, setjmp.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                        _LONGJMP(3P)

Pages that refer to this page: setjmp.h(0p)sigaction(3p)