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_LONGJMP(P) _LONGJMP(P)
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 unpre-
dictable. 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 .
POSIX 2003 _LONGJMP(P)
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