setjmp

Synopsis

#include <setjmp.h>

int setjmp(jmp_buf env);

Status

Partially implemented

Conformance

IEEE Std 1003.1-2017

Description

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.

Tests

Untested

Known bugs

None