sfextern.c

su 的源代码库

/* Copyright (c) Colorado School of Mines, 2006.*/
/* All rights reserved.                       */

#include	"sfhdr.h"

/*	External variables and functions used only by Sfio
**	Written by Kiem-Phong Vo
*/

/* code to initialize mutexes */
static Vtmutex_t	Sfmutex;
static Vtonce_t		Sfonce = VTONCE_INITDATA;
static void _sfoncef()
{	(void)vtmtxopen(_Sfmutex, VT_INIT);
	(void)vtmtxopen(&_Sfpool.mutex, VT_INIT);
	(void)vtmtxopen(sfstdin->mutex, VT_INIT);
	(void)vtmtxopen(sfstdout->mutex, VT_INIT);
	(void)vtmtxopen(sfstderr->mutex, VT_INIT);
	_Sfdone = 1;
}

/* global variables used internally to the package */
Sfextern_t _Sfextern =
{	0,						/* _Sfpage	*/
	{ NIL(Sfpool_t*), 0, 0, 0, NIL(Sfio_t**) },	/* _Sfpool	*/
	NIL(int(*)_ARG_((Sfio_t*,int))),		/* _Sfpmove	*/
	NIL(Sfio_t*(*)_ARG_((Sfio_t*, Sfio_t*))),	/* _Sfstack	*/
	NIL(void(*)_ARG_((Sfio_t*, int, int))),		/* _Sfnotify	*/
	NIL(int(*)_ARG_((Sfio_t*))),			/* _Sfstdsync	*/
	{ NIL(Sfread_f),				/* _Sfudisc	*/
	  NIL(Sfwrite_f),
	  NIL(Sfseek_f),
	  NIL(Sfexcept_f),
	  NIL(Sfdisc_t*)
	},
	NIL(void(*)_ARG_((void)) ),			/* _Sfcleanup	*/
	0,						/* _Sfexiting	*/
	0,						/* _Sfdone	*/
	&Sfonce,					/* _Sfonce	*/
	_sfoncef,					/* _Sfoncef	*/
	&Sfmutex					/* _Sfmutex	*/
};

/* accessible to application code for a few fast macro functions */
ssize_t	_Sfi = -1;

#if vt_threaded
static Vtmutex_t	_Sfmtxin, _Sfmtxout, _Sfmtxerr;
#define SFMTXIN		(&_Sfmtxin)
#define SFMTXOUT	(&_Sfmtxout)
#define SFMTXERR	(&_Sfmtxerr)
#else
#define SFMTXIN		(0)
#define SFMTXOUT	(0)
#define SFMTXERR	(0)
#endif

Sfio_t	_Sfstdin  = SFNEW(NIL(char*),-1,0,
			  (SF_READ |SF_STATIC|SF_MTSAFE),NIL(Sfdisc_t*),SFMTXIN);
Sfio_t	_Sfstdout = SFNEW(NIL(char*),-1,1,
			  (SF_WRITE|SF_STATIC|SF_MTSAFE),NIL(Sfdisc_t*),SFMTXOUT);
Sfio_t	_Sfstderr = SFNEW(NIL(char*),-1,2,
			  (SF_WRITE|SF_STATIC|SF_MTSAFE),NIL(Sfdisc_t*),SFMTXERR);

#undef	sfstdin
#undef	sfstdout
#undef	sfstderr

Sfio_t*	sfstdin  = &_Sfstdin;
Sfio_t*	sfstdout = &_Sfstdout;
Sfio_t*	sfstderr = &_Sfstderr;

__EXTERN__(ssize_t,_Sfi);
__EXTERN__(Sfio_t,_Sfstdin);
__EXTERN__(Sfio_t,_Sfstdout);
__EXTERN__(Sfio_t,_Sfstderr);
__EXTERN__(Sfio_t*,sfstdin);
__EXTERN__(Sfio_t*,sfstdout);
__EXTERN__(Sfio_t*,sfstderr);