местный goto (local goto)
Пролог (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.
Имя (Name)
setjmp — set jump point for a non-local goto
Синопсис (Synopsis)
#include <setjmp.h>
int setjmp(jmp_buf env);
Описание (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.1‐2017 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.
Возвращаемое значение (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.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
In general, sigsetjmp() is more useful in dealing with errors and
interrupts encountered in a low-level subroutine of a program.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
longjmp(3p), sigsetjmp(3p)
The Base Definitions volume of POSIX.1‐2017, setjmp.h(0p)
