longjmp man page on Ultrix

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setjmp(3)							     setjmp(3)

Name
       setjmp, longjmp - nonlocal goto

Syntax
       #include <setjmp.h>

       setjmp(env)
       jmp_buf env;

       longjmp(env, val)
       jmp_buf env;

       _setjmp(env)
       jmp_buf env;

       _longjmp(env, val)
       jmp_buf env;

Description
       These  routines	are  useful  for  dealing  with	 errors and interrupts
       encountered in a low-level subroutine of a program.

       The subroutine saves its stack environment in env for later use	by  It
       returns value 0.

       The  subroutine	restores  the environment saved by the last call of It
       then returns in such a way that execution continues as if the  call  of
       had just returned the value val to the function that invoked which must
       not itself have returned in the	interim.   However,  cannot  cause  to
       return  the value 0. If is invoked with a val of 0, will return 1.  All
       accessible data have values as of the time was called.

       The and subroutines save and restore  the  signal  mask	sigsetmask(2),
       while and manipulate only the C stack and registers.

Restrictions
       The  subroutine	does not save current notion of whether the process is
       executing on the signal stack.  The result is that a  longjmp  to  some
       place on the signal stack leaves the signal stack state incorrect.

See Also
       sigstack(2), sigvec(2), signal(3)

				      VAX			     setjmp(3)
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