This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

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

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                        SETJMP(3POSIX)

       The  functionality  described  on  this  reference  page is aligned with the ISO C standard. Any conflict
       between the requirements described  here  and  the  ISO C  standard  is  unintentional.  This  volume  of
       POSIX.1‐2017 defers to the ISO C standard.

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

       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 identifier 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 expression of a selection or
           iteration statement

        *  The operand of a unary '!'  operator with the  resulting  expression  being  the  entire  controlling
           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.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

       setjmp — set jump point for a non-local goto

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

       None.

       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.

longjmp(), sigsetjmp()

       The Base Definitions volume of POSIX.1‐2017, <setjmp.h>

       #include <setjmp.h>

       int setjmp(jmp_buf env);