Description |
 |
A call to setsetjmp() creates an entry point in a program that can be
accessed via siglongjmp(). The sigsetjmp() macro saves the current
environment of the calling process in env. If savemask is set to a
non-zero value, the current signal mask is also saved in env. A subsequent
call to siglongjmp() requires that the env variable be passed to
restore the environment.
If a zero value is returned, the return is from sigsetjmp() itself and not
a return as a result of a call to siglongjmp().
If a nonzero value is returned, the return is a result of a call to
siglongjmp(). After siglongjmp() is completed, the program executes as
if the call to sigsetjmp() had returned a second time. In this case,
sigsetjmp() returns either the non-zero value passed in the val
argument of siglongjmp() or 1 if zero was passed in val.
