longjmp.c File Reference

#include <setjmp.h>
#include <intrin.h>

Include dependency graph for longjmp.c:

Go to the source code of this file.

Macros
#define	_JUMP_BUFFER_COOKIE   0x56433230

Typedefs
typedef void(__stdcall *	PUNWIND_ROUTINE) (const _JUMP_BUFFER *)

Functions
void __cdecl	_global_unwind2 (void *Registration)
void _stdcall	_seh_longjmp_unwind (const _JUMP_BUFFER *_Buf)
	__declspec (noreturn)

Macro Definition Documentation

_JUMP_BUFFER_COOKIE

#define _JUMP_BUFFER_COOKIE   0x56433230

Definition at line 11 of file longjmp.c.

Typedef Documentation

PUNWIND_ROUTINE

typedef void(__stdcall * PUNWIND_ROUTINE) (const _JUMP_BUFFER *)

Definition at line 15 of file longjmp.c.

Function Documentation

__declspec()

__declspec

(

noreturn

)

Definition at line 19 of file longjmp.c.

{
    const _JUMP_BUFFER* jumpBuffer = (_JUMP_BUFFER*)_Buf;
 
    /* Ensure _Value is non-zero */
    _Value = (_Value == 0) ? 1 : _Value;
 
    /* Check if the exception registration is from a previous function */
    if (jumpBuffer->Registration != __readfsdword(0))
    {
        /* Do a global unwind to the function that owns the target SEH frame */
        _global_unwind2((void*)jumpBuffer->Registration);
    }
 
    /* Check if we have a registration */
    if (jumpBuffer->Registration != 0)
    {
        /* Check if this is a _setjmp3 buffer */
        if (jumpBuffer->Cookie == _JUMP_BUFFER_COOKIE)
        {
            /* Call the unwind function if it is set */
            PUNWIND_ROUTINE unwindFunc = (PUNWIND_ROUTINE)jumpBuffer->UnwindFunc;
            if (unwindFunc != NULL)
            {
                unwindFunc(jumpBuffer);
            }
        }
        else if (jumpBuffer->Registration != 0xFFFFFFFF)
        {
            /* This is a legacy _setjmp buffer, use old style unwind */
            _seh_longjmp_unwind(jumpBuffer);
        }
    }
 
    __longjmp_nounwind(jumpBuffer, _Value);
}

_global_unwind2()

void __cdecl _global_unwind2

(

void *

Registration

)

_seh_longjmp_unwind()

void _stdcall _seh_longjmp_unwind

(

const _JUMP_BUFFER *

_Buf

)