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