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SETJMP(3P) POSIX Programmer's Manual SETJMP(3P)
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.
setjmp — set jump point for a non-local goto
#include <setjmp.h>
int setjmp(jmp_buf env);
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.
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.
No errors are defined.
The following sections are informative.
None.
In general, sigsetjmp() is more useful in dealing with errors and
interrupts encountered in a low-level subroutine of a program.
None.
None.
longjmp(3p), sigsetjmp(3p)
The Base Definitions volume of POSIX.1‐2008, setjmp.h(0p)
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 .
IEEE/The Open Group 2013 SETJMP(3P)
Pages that refer to this page: setjmp.h(0p), _longjmp(3p), longjmp(3p), siglongjmp(3p)