bionic (3) setjmp.3posix.gz

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PROLOG
       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.


NAME
       setjmp — set jump point for a non-local goto


SYNOPSIS
       #include <setjmp.h>

       int setjmp(jmp_buf env);


DESCRIPTION
       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.1‐2008 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.


RETURN VALUE
       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.


ERRORS
       No errors are defined.

       The following sections are informative.


EXAMPLES
       None.


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


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       longjmp(), sigsetjmp()

       The Base Definitions volume of POSIX.1‐2008, <setjmp.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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 .