You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.0 KiB
75 lines
2.0 KiB
/***
|
|
*mterrno.c - provide function versions of errno & _doserrno for LIBC.LIB
|
|
*
|
|
* Copyright (c) 1994-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* Sometimes users want to compile code (such as for use in a library)
|
|
* for both single-thread and multi-thread applications. Currently the
|
|
* one major stumbling block to doing this is the fact that errno &
|
|
* _doserrno are defined in different ways in LIBC.LIB and LIBCMT.LIB.
|
|
* Code that should otherwise be usable with both LIBC.LIB and LIBCMT.LIB
|
|
* but which accesses errno and/or _doserrno is not usable with both.
|
|
* By providing the function versions of errno & _doserrno in LIBC.LIB,
|
|
* users can compile their code for both LIBCMT.LIB and LIBC.LIB.
|
|
* Note that this does not magically make single-thread code safe in a
|
|
* multi-threaded environment, it merely makes it easier to use the
|
|
* same code with LIBC.LIB and LIBCMT.LIB.
|
|
*
|
|
*Revision History:
|
|
* 03-26-94 SKS Original version.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#ifndef _MT
|
|
|
|
/* Get the definitions of the function versions of errno/_doserrno */
|
|
|
|
#define _MT
|
|
#include <stdlib.h>
|
|
#undef _MT
|
|
|
|
/* undo the macros that convert the variable names to function calls */
|
|
|
|
#undef errno
|
|
#undef _doserrno
|
|
|
|
/* declare the variables - must match the definitions in <STDLIB.H> */
|
|
|
|
extern int errno; /* XENIX style error number */
|
|
extern unsigned long _doserrno; /* OS system error value */
|
|
|
|
|
|
/***
|
|
*int * _errno() - return pointer to thread's errno
|
|
*unsigned long * __doserrno() - return pointer to thread's _doserrno
|
|
*
|
|
*Purpose:
|
|
* _errno() returns a pointer to the global variable errno
|
|
* __doserrno returns a pointer to the global variable _doserrno
|
|
*
|
|
*Entry:
|
|
* None.
|
|
*
|
|
*Exit:
|
|
* See above.
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
int * __cdecl _errno(
|
|
void
|
|
)
|
|
{
|
|
return & errno;
|
|
}
|
|
|
|
unsigned long * __cdecl __doserrno(
|
|
void
|
|
)
|
|
{
|
|
return & _doserrno;
|
|
}
|
|
|
|
#endif /* !_MT */
|