HP-UX Reference (11i v1 05/09) - 3 Library Functions N-Z (vol 7)

setjmp(3C) setjmp(3C)

Some implementations of Pascal support a ‘‘try/recover’’ mechanism, which also creates stack marker infor-

mation. If a longjmp() operation occurs in a scope which is nested inside a try/recover, and the

corresponding

setjmp() is not inside the scope of the try/recover, the recover block will not be executed

and the currently active recover block will become the one enclosing the

setjmp(), if one exists.

WARNINGS

A call to

longjmp() to leave the guaranteed stack space reserved by

sigspace() might remove the

guarantee that the ordinary execution of the program will not extend into the guaranteed space. It might

also cause the program to forever lose its ability to automatically increase the stack size, and the program

might then be limited to the guaranteed space.

The result of using

setjmp() within an expression can be unpredictable.

If longjmp() is called even though env was never primed by a call to

setjmp(), or when the last such

call was in a function that has since returned, total chaos is guaranteed.

The effect of a call to

longjmp() where the initialization of the

jmp_buf argument was not performed

in the calling thread is undeﬁned. The effect of a call to

siglongjmp() where the initialization of the

sigjmp_buf argument was not performed in the calling thread is undeﬁned.

The contents of the jmp_buf buffer are architecture and compilation environment speciﬁc. Thus, objects

built using these functions may not be supported across architectures.

AUTHOR

setjmp() was developed by AT&T and HP.