1SETJMP(3P)                 POSIX Programmer's Manual                SETJMP(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       setjmp - set jump point for a non-local goto
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SYNOPSIS

15       #include <setjmp.h>
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17       int setjmp(jmp_buf env);
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DESCRIPTION

21       A call to setjmp() shall save the calling environment in its env  argu‐
22       ment for later use by longjmp().
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24       It  is  unspecified  whether  setjmp()  is a macro or a function.  If a
25       macro definition is suppressed in order to access an  actual  function,
26       or  a  program defines an external identifier with the name setjmp, the
27       behavior is undefined.
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29       An application shall ensure that an invocation of setjmp()  appears  in
30       one of the following contexts only:
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32        * The entire controlling expression of a selection or iteration state‐
33          ment
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35        * One operand of a relational or equality operator with the other  op‐
36          erand an integral constant expression, with the resulting expression
37          being the entire controlling expression of a selection or  iteration
38          statement
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40        * The  operand  of  a unary '!' operator with the resulting expression
41          being the entire controlling expression of a selection or iteration
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43        * The entire expression of an expression statement (possibly  cast  to
44          void)
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46       If  the  invocation appears in any other context, the behavior is unde‐
47       fined.
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RETURN VALUE

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

55       No errors are defined.
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57       The following sections are informative.
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EXAMPLES

60       None.
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APPLICATION USAGE

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

67       None.
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FUTURE DIRECTIONS

70       None.
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SEE ALSO

73       longjmp(),    sigsetjmp(),    the    Base    Definitions    volume   of
74       IEEE Std 1003.1-2001, <setjmp.h>
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77       Portions of this text are reprinted and reproduced in  electronic  form
78       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
79       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
80       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
81       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
82       event of any discrepancy between this version and the original IEEE and
83       The Open Group Standard, the original IEEE and The Open Group  Standard
84       is  the  referee document. The original Standard can be obtained online
85       at http://www.opengroup.org/unix/online.html .
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89IEEE/The Open Group                  2003                           SETJMP(3P)
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