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NAME

       setjmp, sigsetjmp - save stack context for non-local goto

SYNOPSIS

       #include <setjmp.h>

       int setjmp(jmp_buf env);
       int sigsetjmp(sigjmp_buf env, int savesigs);

DESCRIPTION

       setjmp()   and  longjmp()  are  useful  for  dealing  with  errors  and
       interrupts  encountered  in  a  low-level  subroutine  of  a   program.
       setjmp()  saves  the  stack context/environment in env for later use by
       longjmp().  The stack context will be invalidated if the function which
       called setjmp() returns.

       sigsetjmp() is similar to setjmp().  If savesigs is nonzero, the set of
       blocked signals is saved in env and will be restored if a  siglongjmp()
       is later performed with this env.

RETURN VALUE

       setjmp()  and  sigsetjmp() return 0 if returning directly, and non-zero
       when returning from longjmp() using the saved context.

CONFORMING TO

       POSIX, ISO 9899

NOTES

       POSIX does not specify whether setjmp will save the signal context. (In
       SYSV  it  will  not. In BSD4.3 it will, and there is a function _setjmp
       that will not.)  If you want to save signal masks, use sigsetjmp.

       setjmp() and sigsetjmp make programs hard to understand  and  maintain.
       If possible an alternative should be used.

SEE ALSO

       longjmp(3), siglongjmp(3)

                                 March 2, 1997                       SETJMP(3)