LONGJMP (3)
non-local jump to a saved stack context
SYNOPSIS
void longjmp(jmp_buf env , int val );
void siglongjmp(sigjmp_buf env , int val );
b
DESCRIPTION
longjmp() and setjmp() are useful for dealing with errors
and interrupts encountered in a low-level subroutine of a program.
longjmp() restores the environment saved by the last call of
setjmp() with the corresponding env argument. After
longjmp() is completed, program execution continues as if the
corresponding call of setjmp() had just returned the value
val. longjmp() cannot cause 0 to be returned. If longjmp
is invoked with a second argument of 0, 1 will be returned instead.
siglongjmp() is similar to longjmp() except for the type of
its env argument. If the sigsetjmp() call that set this
env used a nonzero savesigs flag, siglongjmp() also
restores the set of blocked signals.
RETURN VALUE
These functions never return.
CONFORMING TO
NOTES
POSIX does not specify whether longjmp will restore the signal
context. If you want to save and restore signal masks, use
siglongjmp.
longjmp() and siglongjmp() make programs hard to
understand and maintain. If possible an alternative should be used.
SEE ALSO
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