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NAME

       longjmp, siglongjmp - non-local jump to a saved stack context

SYNOPSIS

       #include <setjmp.h>

       void longjmp(jmp_buf env, int val);
       void siglongjmp(sigjmp_buf env, int val);

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

       POSIX

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

       setjmp(3), sigsetjmp(3)

                                 March 2, 1997                      LONGJMP(3)