_longjmp(3C) Standard C Library Functions _longjmp(3C)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 are identical to longjmp(3C) and
setjmp(3C), respectively, with the additional restriction that
_longjmp() and _setjmp() do 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 VALUES
Refer to longjmp(3C) and setjmp(3C).
ERRORS
No errors are defined.
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 ter‐
mination. If the function has returned, the results are undefined.
Passing longjmp() a pointer to a buffer not created by setjmp(), pass‐
ing _longjmp() a pointer to a buffer not created by _setjmp(), passing
siglongjmp(3C) a pointer to a buffer not created by sigsetjmp(3C) 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(3C) and sigsetjmp(3C) respectively.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ATTRIBUTE TYPE │ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOlongjmp(3C), setjmp(3C), siglongjmp(3C), sigsetjmp(3C), attributes(5),
standards(5)SunOS 5.11 24 Jul 2002 _longjmp(3C)
