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

20       The functionality described on this reference page is aligned with  the
21       ISO C  standard.  Any  conflict between the requirements described here
22       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
23       defers to the ISO C standard.
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25       A  call to setjmp() shall save the calling environment in its env argu‐
26       ment for later use by longjmp().
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28       It is unspecified whether setjmp() is a macro or a function. If a macro
29       definition  is  suppressed  in order to access an actual function, or a
30       program defines an external identifier with the name setjmp, the behav‐
31       ior is undefined.
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33       An  application  shall ensure that an invocation of setjmp() appears in
34       one of the following contexts only:
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36        *  The entire controlling  expression  of  a  selection  or  iteration
37           statement
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39        *  One operand of a relational or equality operator with the other op‐
40           erand an integral constant expression, with the  resulting  expres‐
41           sion  being  the  entire  controlling  expression of a selection or
42           iteration statement
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44        *  The operand of a unary '!'  operator with the resulting  expression
45           being the entire controlling expression of a selection or iteration
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47        *  The  entire expression of an expression statement (possibly cast to
48           void)
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50       If the invocation appears in any other context, the behavior  is  unde‐
51       fined.
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RETURN VALUE

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

59       No errors are defined.
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61       The following sections are informative.
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EXAMPLES

64       None.
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APPLICATION USAGE

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

71       None.
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FUTURE DIRECTIONS

74       None.
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SEE ALSO

77       longjmp(), sigsetjmp()
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79       The Base Definitions volume of POSIX.1‐2017, <setjmp.h>
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82       Portions of this text are reprinted and reproduced in  electronic  form
83       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
84       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
85       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
86       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
87       event of any discrepancy between this version and the original IEEE and
88       The Open Group Standard, the original IEEE and The Open Group  Standard
89       is  the  referee document. The original Standard can be obtained online
90       at http://www.opengroup.org/unix/online.html .
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92       Any typographical or formatting errors that appear  in  this  page  are
93       most likely to have been introduced during the conversion of the source
94       files to man page format. To report such errors,  see  https://www.ker‐
95       nel.org/doc/man-pages/reporting_bugs.html .
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99IEEE/The Open Group                  2017                           SETJMP(3P)
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