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setjmp

Saves the current state of the program.

int setjmp(
   jmp_buf env 
);

Parameter

env
Variable in which environment is stored.

Return Value

Returns 0 after saving the stack environment. If setjmp returns as a result of a longjmp call, it returns the value argument of longjmp, or if the value argument of longjmp is 0, setjmp returns 1. There is no error return.

Remarks

The setjmp function saves a stack environment, which you can subsequently restore using longjmp. When used together, setjmp and longjmp provide a way to execute a nonlocal goto. They are typically used to pass execution control to error-handling or recovery code in a previously called routine without using the normal calling or return conventions.

A call to setjmp saves the current stack environment in env. A subsequent call to longjmp restores the saved environment and returns control to the point just after the corresponding setjmp call. All variables (except register variables) accessible to the routine receiving control contain the values they had when longjmp was called.

Note   setjmp and longjmp do not support C++ object semantics. In C++ programs, use the C++ exception-handling mechanism.

Requirements

Routine Required header Compatibility
setjmp <setjmp.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Example

See the example for _fpreset.

See Also

Process and Environment Control Routines | longjmp | Run-Time Routines and .NET Framework Equivalents

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