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SETJMP(P)			    POSIX Programmer's Manual				SETJMP(P)

       setjmp - set jump point for a non-local goto

       #include <setjmp.h>

       int setjmp(jmp_buf env);

       A call to setjmp() shall save the calling environment in its env argument for later use by

       It is unspecified whether setjmp() is a macro or a function.  If  a  macro  definition  is
       suppressed in order to access an actual function, or a program defines an external identi-
       fier with the name setjmp, the behavior is undefined.

       An application shall ensure that an invocation of setjmp() appears in one of the following
       contexts only:

	* The entire controlling expression of a selection or iteration statement

	* One  operand	of  a  relational or equality operator with the other operand an integral
	  constant expression, with the resulting expression being the entire controlling expres-
	  sion of a selection or iteration statement

	* The operand of a unary '!' operator with the resulting expression being the entire con-
	  trolling expression of a selection or iteration

	* The entire expression of an expression statement (possibly cast to void)

       If the invocation appears in any other context, the behavior is undefined.

       If the return is from a direct invocation, setjmp() shall return 0. If the return is  from
       a call to longjmp(), setjmp() shall return a non-zero value.

       No errors are defined.

       The following sections are informative.


       In  general,  sigsetjmp() is more useful in dealing with errors and interrupts encountered
       in a low-level subroutine of a program.



       longjmp() , sigsetjmp() , the Base Definitions volume of IEEE Std 1003.1-2001, <setjmp.h>

       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					SETJMP(P)
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