/*
Copyright (c) 1993 Xerox Corporation.  All rights reserved.
*/
/*
$Id$

$Date$
 *
 * PCR - I/O local (per-thread) descriptor support
 *
 */

#ifndef	__PCR_IOLcl_h
#define __PCR_IOLcl_h 1

#include <config/PCR_StdTypes.h>
#include <th/PCR_ThData.h>
#include <io/PCR_IOGbl.h>
#include <limits.h>

typedef volatile struct PCR_IOLcl_DERep * PCR_IOLcl_DEPtr;

struct PCR_IOLcl_DERep {
    /* global fildes (>0) or empty (0) */
        PCR_ERes lde_gfd;
    /* per-descriptor data for fcntl */
        int lde_fcntlFD;
};

typedef volatile struct PCR_IOLcl_DERep PCR_IOLcl_DE;

#define PCR_IOLcl_DE_null	{ 0, 0 }


typedef volatile struct PCR_IOLcl_DataRep * PCR_IOLcl_DataPtr;

struct PCR_IOLcl_DataRep {
    /* per-thread working directory */
        const char *ld_wd;
    /* per-thread umask */
        mode_t ld_umask;
    /* number of open files */
        int ld_nOpen;
    /* data per open file */
        PCR_IOLcl_DE ld_lde[PCR_POSIX_OPEN_MAX];
};

typedef struct PCR_IOLcl_DataRep PCR_IOLcl_Data;

#define PCR_IOLcl_ld	(*( (PCR_IOLcl_Data **) \
	(&( PCR_ThData_Get()->td__ioData )) ))

extern PCR_IOLcl_DEPtr
PCR_IOLcl_DEPtr_FromFD(int fd);

#define PCR_IOLcl_DEPtr__FromFD(fd) (&(PCR_IOLcl_ld->ld_lde[fd]))
#define PCR_IOLcl_DEPtr_FromFD	PCR_IOLcl_DEPtr__FromFD

extern int
PCR_IOLcl_DEPtr_ToFD(PCR_IOLcl_DEPtr lde);

#define PCR_IOLcl_DEPtr__ToFD(lde) (\
	(lde) - PCR_IOLcl_DEPtr__FromFD(0) )
#define PCR_IOLcl_DEPtr_ToFD	PCR_IOLcl_DEPtr__ToFD


extern int
PCR_IOLcl_DEPtr_ToGFD(PCR_IOLcl_DEPtr lde);

#define PCR_IOLcl_DEPtr__ToGFD(lde) (\
	(lde)->lde_gfd )
#define PCR_IOLcl_DEPtr_ToGFD	PCR_IOLcl_DEPtr__ToGFD
/*
    For internal use -- doesn't bump ref count.
*/


extern PCR_IOLcl_DEPtr
PCR_IOLcl_FindUnusedDEPtr(PCR_IOLcl_DEPtr lde);
/*
    Return an unused local descriptor entry,
      with fildes value >= lde if lde is not NIL.
    Return NIL if none available.
    Not reliable if signal might be delivered.
*/

extern void
PCR_IOLcl_AdjustNOpen(int delta);

#define PCR_IOLcl__AdjustNOpen(delta) {\
	PCR_IOLcl_ld->ld_nOpen += (delta); }
#define PCR_IOLcl_AdjustNOpen	PCR_IOLcl__AdjustNOpen

/*
    Adjust count of open local descriptors.
*/


/*
 * Initialization
 *
 * Called from PCR_IOImpl.c
 */

extern PCR_ERes PCR_IOLcl_Setup(void);

extern PCR_ERes PCR_IOLcl_Run(void);


#endif /* ! __PCR_IOLcl_h */

/*
$Log$
*/