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

PROLOG         top

       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         top

       setjmp — set jump point for a non-local goto

SYNOPSIS         top

       #include <setjmp.h>

       int setjmp(jmp_buf env);

DESCRIPTION         top

       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

        *  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

RETURN VALUE         top

       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         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top



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

RATIONALE         top




SEE ALSO         top

       longjmp(3p), sigsetjmp(3p)

       The Base Definitions volume of POSIX.1‐2008, setjmp.h(0p)

COPYRIGHT         top

       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 .

       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 .

IEEE/The Open Group                 2013                          SETJMP(3P)

Pages that refer to this page: setjmp.h(0p)longjmp(3p)_longjmp(3p)siglongjmp(3p)