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_LONGJMP
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
Return to Main Contents
PROLOG
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
_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 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
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, 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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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