Sprite 1984 - 1993/Sprite 1984 - 1993.iso/src/lib/include/dev/RCS/pdev.h,v

Text File | 1991-11-17 | 29KB | 1,047 lines

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@/*
 * pdev.h --
 *
 *    Declarations of the kernel/user-level-server interface for
 *    pseudo-devices. A pseudo-device is a file
 *    whose semantics are implemented by a user-level server process.
 *    All other processes act on the file normally.  Their operations
 *    on the file are mapped by the kernel into a request-response
 *    exchange with the server process.  The types and constants defined
 *    here are needed by the server programs to implement their
 *    half of the pseudo-device protocol.  As well as implement the
 *    regular file operations, Fs_Read, Fs_Write, and Fs_IOControl,
 *    the server is involved in open/close time actions, and the
 *    server helps control the select state of the pseudo device.
 *
 *    A more complete explaination of pseudo-devices should be in
 *    the man page (/sprite/doc/ref/devices/pdev), but the following
 *    brief explaination may help.  The interface between the kernel
 *    and the server process is based on filesystem streams.  The
 *    server gets a "control stream" when it opens the pseudo-device
 *    file with the FS_MASTER flag.  This control stream is readable
 *    when a new client process has opened the pseudo-device.  The
 *    control stream contains a short message with a new filesystem
 *    streamID for a "service stream" that the server uses to communicate
 *    with the new client.
 *    Service streams are used by the server to get request messages
 *    (that correspond to client operations) and return results.
 *
 *    Associated with each service stream is a "request buffer".  The server
 *    gets request messages from clients indirectly; the requests are
 *    placed into the request buffer, along with their data, and the server
 *    learns about new requests by reading messages from the service stream
 *    that contain 'firstByte' and 'lastByte' offsets into the request buffer.
 *    This buffered interface lets the kernel stack up many requests (writes,
 *    in particular) before a    context switch is required to the server
 *    program.  Of course, this also lets the server handle all the queued
 *    requests at one time.  When the    server has handled requests it updates
 *    the 'firstByte' pointer by making a IOC_PDEV_SET_PTRS ioctl() on
 *    the service stream.
 *
 *    There can also be a read ahead buffer associated with each service
 *    stream.  This is filled with data by the server program that is to
 *    be read by a client, and the kernel moves data from this buffer,
 *    which is again in the server's address space, to the client without
 *    having to switch out to the server process.
 *
 * Copyright 1987 Regents of the University of California
 * All rights reserved.
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies.  The University of California
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 *
 *
 * $Header: /sprite/src/lib/include/dev/RCS/pdev.h,v 1.16 89/06/15 11:29:56 brent Exp Locker: brent $ SPRITE (Berkeley)
 */

#ifndef _PDEV
#define _PDEV

#include "proc.h"
#ifdef KERNEL
#include "fs.h"
#else
#include <kernel/fs.h>
#endif

/*
 * Pseudo-device operations
 *    PDEV_OPEN        The first request after a client open.
 *    PDEV_DUP        OBSOLETE, but might resurrect itself.
 *    PDEV_CLOSE        The last request.
 *    PDEV_READ        Read data from the pseudo-device.
 *    PDEV_WRITE        Write data to the pseudo-device.
 *    PDEV_IOCTL        Special operation on the pseudo-device.
 *    PDEV_WRITE_ASYNC    Asynchronous write.  No reply needed.
 *
 * These two only apply to pseudo-device connections to pseudo-file-systems.
 * For regular pseudo-devices the kernel takes care of attribute handling.
 *    PDEV_GET_ATTR        Get attributes given a pdev connection.
 *    PDEV_SET_ATTR        Set attributes given a pdev connection.
 */

typedef int Pdev_Op;

#define PDEV_OPEN        1
/* #define PDEV_DUP        2 */
#define PDEV_CLOSE        3
#define PDEV_READ        4
#define PDEV_WRITE        5
#define PDEV_IOCTL        6
#define PDEV_WRITE_ASYNC    7
#define PDEV_GET_ATTR        8
#define PDEV_SET_ATTR        9

/*
 * A pseudo-device server gets a 'control stream' when opening a pseudo-device.
 * The following structure describes the messages read from the control stream.
 * Control stream messages are used to notify the server that it
 * has a new private stream because a client opened the pseudo-device.
 */
typedef struct Pdev_Notify {
    unsigned int    magic;            /* == PDEV_NOTIFY_MAGIC */
    int            newStreamID;
    int            reserved;        /* Extra */
} Pdev_Notify;

#define PDEV_NOTIFY_MAGIC    0x1D4E4F52

/*
 * The first message on a private stream is a PDEV_OPEN.
 * This message identifies the client process, its host, and the host's
 * byte order to the server.
 */

typedef struct Pdev_OpenParam {
    int flags;            /* Flags from the Fs_Open call */
    Proc_PID pid;        /* Client's process ID */
    int hostID;            /* Host ID where client is from */
    int uid;            /* User ID of the client process */
    int gid;            /* Group ID of the client process */
    int byteOrder;        /* Byte order identifier */
    int reserved;        /* Extra */
} Pdev_OpenParam;

/*
 * PDEV_READ, PDEV_WRITE request parameters, see <kernel/fsIO.h>
 */

typedef Fs_IOParam Pdev_RWParam;

/*
 * PDEV_IOCTL request parameter, see <kernel/fsIO.h>
 */

typedef Fs_IOCParam Pdev_IOCParam;

/*
 * PDEV_SET_ATTR request parameters.  These are in the Pdev_Request header,
 * and the new Fs_Attributes record is passed as the data block following
 * the header.  The user and group ID are used for authentication.
 */

typedef struct {
    int        flags;        /* Which attributes to set */
    int        uid;        /* User ID */
    int        gid;        /* Group ID */
} Pdev_SetAttrParam;


/*
 * When a client does something to the pseudo-device the server gets
 * a corresponding request message.  The structure of it is defined here.
 * The control information in the request header is the same for both
 * pseudo-device and pseudo-filesystem operations.
 */

typedef struct {
    unsigned int magic;        /* PDEV_REQUEST_MAGIC or PFS_REQUEST_MAGIC */
    Pdev_Op    operation;    /* What action is requested. */
    int        messageSize;    /* The complete size of the request header
                 * plus data, plus padding for alignment */
    int        requestSize;    /* Size of data following this header */
    int        replySize;    /* Max size of the reply data expected. */
    int        dataOffset;    /* Offset of data from start of header */
} Pdev_RequestHdr;

typedef struct {
    Pdev_RequestHdr    hdr;    /* with PDEV_REQUEST_MAGIC */
    union {            /* Additional parameters to the operation. */
    Pdev_OpenParam        open;
    Pdev_RWParam        read;
    Pdev_RWParam        write;
    Pdev_IOCParam        ioctl;
    Pdev_SetAttrParam    setAttr;
    } param;
} Pdev_Request;

#define PDEV_REQUEST_MAGIC    0x7265717E

/*
 * IOC_PDEV_REPLY is used to return the following information about
 * a reply to a client's request.  The status in
 * the reply header will be the return value of the client's system call,
 * except for FS_WOULD_BLOCK and FS_LOOKUP_REDIRECT which are processed
 * by the kernel.
 */

typedef struct Pdev_Reply {
    unsigned int magic;        /* PDEV_REPLY_MAGIC */
    ReturnStatus status;    /* Return status of remote call */
    int        selectBits;    /* Return select state bits */
    int        replySize;    /* Size of the data in replyBuf, if any */
    Address    replyBuf;    /* Server space address of reply data */
    int        signal;        /* Signal to return, if non-zero */
    int        code;        /* Code to modify signal */
} Pdev_Reply;

#define PDEV_REPLY_MAGIC    0x52455057

/*
 * IOC_PDEV_SMALL_REPLY uses the following struct to return a small
 * amount of data to the client's request.
 * Up to PDEV_SMALL_DATA_LIMIT bytes can be returned.
 *
 */
#define PDEV_SMALL_DATA_LIMIT    16

typedef struct Pdev_ReplyData {
    unsigned int magic;        /* PDEV_REPLY_DATA_MAGIC */
    ReturnStatus status;    /* Return status of remote call */
    int        selectBits;    /* Return select state bits */
    int        replySize;    /* Size of following data */
    Address    replyBuf;    /* Unused, needed for padding & compatibility */
    int        signal;        /* (non-zero) Signal to generate, if any */
    int        code;        /* Code to modify the signal */
    char    data[PDEV_SMALL_DATA_LIMIT];    /* Reply data */
} Pdev_ReplyData;

#define PDEV_REPLY_DATA_MAGIC    0x524ABC57

/*
 * I/O Controls for server streams.
 *    IOC_PDEV_READY        The server uses this to notify the kernel
 *                that the pseudo-device is ready for I/O now.
 *                The input buffer should contain an int
 *                with an or'd combination of FS_READABLE,
 *                FS_WRITABLE, or FS_EXCEPTION.
 *    IOC_PDEV_SET_BUF    These are used to tell the kernel where the
 *                request buffer and read ahead buffer (if any)
 *                are. The input buffer should contain a
 *                Pdev_SetBufArgs struct.  Note that this
 *                needs to be done after getting a notification
 *                on the control stream before any request
 *                (i.e. the client's open request) comes through.
 *                This can also be done later to change the
 *                buffer if needed.  The buffer change takes
 *                place as soon as the previous one empties.
 *                The switch is indicated by the requestAddr
 *                that you read from the service stream.
 *    IOC_PDEV_WRITE_BEHIND    Set (Unset) write-behind buffering in the
 *                request buffer.  The single input argument
 *                is a pointer to a Boolean; TRUE enables
 *                write-behind, FALSE inhibits it.  The default
 *                is no write-behind.
 *    IOC_PDEV_SET_PTRS    These are used to update the firstByte and
 *                lastByte pointers into the request and
 *                read ahead buffers.  The input buffer
 *                is a Pdev_BufPtrs structure.
 *    IOC_PDEV_REPLY        This is used to send a reply to a request.
 *                The input buffer contains a Pdev_Reply.  This
 *                includes an address (in the server's space)
 *                of a buffer containing reply data, if any.
 *    IOC_PDEV_SMALL_REPLY    This is like IOC_PDEV_REPLY, except that
 *                the reply data is embedding in the struct
 *                passed into the kernel.  The amount of data
 *                that can be returned this was is defined
 *                by PDEV_SMALL_DATA_LIMIT.
 *    IOC_PDEV_BIG_WRITES    Set (Unset) the ability of the client to
 *                write a chunk larger than will fit into
 *                the request buffer.  This is to support
 *                UDP socket semantics that prevent a client
 *                from writing more than the declared packet size.
 *                (Of course, we could do better by keeping the
 *                 existing semantics that automatically break
 *                 the write into smaller ones...)
 *                The input buffer should reference a Boolean;
 *                TRUE enables big writes (which is the default)
 *                FALSE prevents big writes.
 *    IOC_PDEV_SIGNAL_OWNER    This sends a signal to the controlling process
 *                of the pseudo-device.  If there is no owner
 *                then this is ignored.  The input buffer contains
 *                the signal number and code to send.
 *
 */

#define IOC_PDEV        (2 << 16)
#define IOC_PDEV_READY        (IOC_PDEV | 0x1)
#define IOC_PDEV_SET_BUF    (IOC_PDEV | 0x2)
#define IOC_PDEV_WRITE_BEHIND    (IOC_PDEV | 0x3)
#define IOC_PDEV_SET_PTRS    (IOC_PDEV | 0x4)
#define IOC_PDEV_REPLY        (IOC_PDEV | 0x5)
#define IOC_PDEV_BIG_WRITES    (IOC_PDEV | 0x6)
#define IOC_PDEV_SIGNAL_OWNER    (IOC_PDEV | 0x7)
#define IOC_PDEV_SMALL_REPLY    (IOC_PDEV | 0x8)

/*
 * Input structure for the IOC_PDEV_SET_BUF IOControl
 */

typedef struct Pdev_SetBufArgs {
    Address    requestBufAddr;        /* Server's address of request buffer */
    int        requestBufSize;        /* Num bytes in the request buffer */
    Address    readBufAddr;        /* NULL if no read ahead.  Non-NULL
                     * implicitly enables read-ahead. */
    int        readBufSize;        /* Num bytes in the read ahead buffer */
} Pdev_SetBufArgs;

/*
 * Input structure for IOC_PDEV_SET_PTRS IOControl.
 */

typedef struct Pdev_BufPtrs {
    int magic;            /* == PDEV_BUF_PTR_MAGIC */
    Address    requestAddr;    /* The address of the request buffer.  This is
                 * valid when reading only, and it indicates
                 * what request buffer is being used.  See
                 * IOC_PDEV_SET_BUF. */
    int requestFirstByte;    /* Byte offset of the first valid data byte
                 * in the request buffer.  If -1 buf is empty */
    int requestLastByte;    /* Byte offset of the last valid data byte. */
    int readFirstByte;        /* Byte offset of the first valid data byte
                 * in the read ahead buffer. -1 => empty */
    int readLastByte;        /* Byte offset of the last data byte. */
} Pdev_BufPtrs;

#define PDEV_BUF_PTR_MAGIC    0x3C46DF14

/*
 * Stucture for the IOC_PDEV_SIGNAL_OWNER operation.
 */
typedef struct Pdev_Signal {
    unsigned int signal;
    unsigned int code;
} Pdev_Signal;

#endif _PDEV
@


1.17.1.1
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@Initial branch for Sprite server.
@
text
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 * $Header: /sprite/src/lib/include/dev/RCS/pdev.h,v 1.17 89/06/15 12:15:06 brent Exp $ SPRITE (Berkeley)
@


1.16
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@Nuked use of fsIO.h
@
text
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 * $Header: /sprite/src/lib/include/dev/RCS/pdev.h,v 1.15 89/06/02 13:36:11 brent Exp Locker: brent $ SPRITE (Berkeley)
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@


1.15
log
@New interface that includes signals and expanded parameter blocks
@
text
@d58 1
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 * $Header: /sprite/src/lib/include/dev/RCS/pdev.h,v 1.14 89/03/13 08:58:35 brent Exp Locker: brent $ SPRITE (Berkeley)
a65 5
#ifdef KERNEL
#include "fsIO.h"
#else
#include <kernel/fsIO.h>
#endif
@


1.14
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@Added IOC_PDEV_SIGNAL_OWNER constant
@
text
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 * $Header: /sprite/src/lib/include/dev/RCS/pdev.h,v 1.13 89/01/27 09:33:56 brent Exp $ SPRITE (Berkeley)
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#define PDEV_NOTIFY_MAGIC    0x1D4E4F54
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 * PDEV_READ, PDEV_WRITE request parameters.
 *    There is a reply block for read, the data.  There is no
 *    reply data for a write.
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typedef struct {
    int        offset;        /* Byte offset for the transfer, the length of
                 * the transfer is implied by the sizes in the
                 * Request header. */
    unsigned int familyID;    /* Can be used to enforce controlling tty */
    Proc_PID    procID;        /* Needed for signalling, etc. */
    int        reserved;    /* Extra */
} Pdev_RWParam;
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 * PDEV_IOCTL request parameter.
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typedef struct {
    int        command;    /* I/O control command #. */
    unsigned int familyID;    /* Can be used to enforce controlling tty */
    Proc_PID    procID;        /* Process id of calling process */
    int        byteOrder;    /* Defines caller's byte order.  Needed
                 * to correctly interpret following data. */
    int        reserved;    /* Extra */
} Pdev_IOCParam;
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 * the header.
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#define PDEV_REQUEST_MAGIC    0x7265717D
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 * The server replies to each message on the private stream with
 * a reply header followed with reply data (if any).  The status in
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    unsigned int magic;        /* == PDEV_REPLY_MAGIC */
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    int        reserved;    /* Extra */
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#define PDEV_REPLY_MAGIC    0x52455058
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@


1.13
log
@Added IOC_PDEV_SIGNAL
@
text
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 * $Header: /sprite/src/lib/include/dev/RCS/pdev.h,v 1.12 89/01/19 09:35:14 brent Exp Locker: brent $ SPRITE (Berkeley)
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@


1.12
log
@Removed pseudo-file-system definitions to their own file
@
text
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 * $Header: /sprite/src/lib/include/dev/RCS/pdev.h,v 1.11 88/11/17 09:03:52 brent Exp Locker: brent $ SPRITE (Berkeley)
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@


1.11
log
@Added rename parameters
@
text
@d5 1
a5 1
 *    pseudoo-devices and pseudo-filesystems. A pseudo-device is a file
a15 4
 *    Pseudo-filesystem servers handle naming requests over the same
 *    kind of communication channel that pseudo-device servers handle
 *    I/O requests.
 *
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 *    learns of new requests from clients indirectly; the requests are
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 *    which is again in the server's address space, to the client's buffer.
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 * $Header: /sprite/src/lib/include.new/dev/RCS/pdev.h,v 1.10 88/10/19 16:04:38 brent Exp $ SPRITE (Berkeley)
a66 6
#ifdef KERNEL
#include "fsNameOps.h"
#else
#include <kernel/fsNameOps.h>
#endif

a67 12
 * Type of operation requested by a client.  There are two mutually exclusize
 *    command groups, those for pseudo-devices, and those for
 *    pseudo-filesystems.  The pseduo-device commands are used to open
 *    a connection to a pseudo-device, and then to forward I/O operations
 *    to the pseudo-device server.  The pseudo-filesystem commands are used
 *    forward naming operations from the kernel to the pseudo-filesystem
 *    server.  These are kept distinct, instead of overlapping,
 *    for consistency checking.  Note that there are two variants of the
 *    command request header, Pdev_Request vs. Pfs_Request.  These are
 *    slightly different because of differences in command parameters.
 *    (Typedefs below are used to marshal parameters to these calls.)
 *
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 *    PDEV_INVALID        Not used
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 *
 * Pseudo-filesystem pathname operations
 *    PFS_OPEN        Open a file in the pseudo-filesystem.
 *    PFS_GET_ATTR        Get attributes given a pathname in a pfs.
 *    PFS_SET_ATTR        Set attributes given a pathname in a pfs.
 *    PFS_MAKE_DEVICE        Make a device
 *    PFS_MAKE_DIR        Make a directory
 *    PFS_REMOVE        Remove a file
 *    PFS_REMOVE_DIR        Remove a directory
 *    PFS_RENAME        Rename a file
 *    PFS_HARD_LINK        Make a hard link between two files.
d83 1
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typedef enum {
    PDEV_INVALID,
    PDEV_OPEN,
    PDEV_DUP,
    PDEV_CLOSE,
    PDEV_READ,
    PDEV_WRITE,
    PDEV_IOCTL,
    PDEV_GET_ATTR,        /* For Fs_GetAttributesID */
    PDEV_SET_ATTR,
    PFS_OPEN,
    PFS_GET_ATTR,        /* For Fs_GetAttributes */
    PFS_SET_ATTR,
    PFS_MAKE_DEVICE,
    PFS_MAKE_DIR,
    PFS_REMOVE,
    PFS_REMOVE_DIR,
    PFS_RENAME,
    PFS_HARD_LINK,
} Pdev_Op;
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#define PDEV_NUM_OPS    18
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 * This message provides a unique ID for the client and
 * provides some other IDs for use by the server.
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 * PDEV_SET_ATTR request parameters.  These are in the Pfs_Request header,
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 * The control information in the command header is the same for both
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    unsigned int magic;        /* PDEV_REQUEST_MAGIC|PFS_REQUEST_MAGIC */
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 * When a naming operation is done in a pseudo-filesystem the pfs server
 * gets a message of the following format.
 */

typedef struct {
    Pdev_RequestHdr    hdr;    /* with PFS_REQUEST_MAGIC */
    union {            /* Additional parameters to the operation. */
    FsOpenArgs        open;
    FsLookupArgs        lookup;
    FsMakeDeviceArgs    makeDevice;
    Fs2PathParams        rename;
    } param;
} Pfs_Request;

#define PFS_REQUEST_MAGIC    0x73657C6A

/*
 * When a PFS_SET_ATTR operation is done the data that follows the message hdr
 * has the following format.  The file name comes at the end and its true
 * length is given in one field.
 */

typedef struct {
    Fs_Attributes    attr;        /* Attribute values */
    int            flags;        /* Indicates which attributes to set */
    int            nameLength;    /* Number of bytes in name */
    char        name[4];    /* Actually larger */
} Pfs_SetAttrData;

/*
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 * the reply header will be the return value of the client's system call.
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 * I/O Controls specific to pseudo-filesystem servers
 *    IOC_PFS_OPEN        This is used instead of IOC_PDEV_REPLY to
 *                respond to a PFS_OPEN request.  This reply
 *                causes a new pseudo-device connection between
 *                the server and the opening client.  The result
 *                of this I/O control is a new streamID for
 *                the server's half of the connection.  Unlike
 *                pseudo-device servers, there is no need to
 *                read a control stream to get this streamID,
 *                it is returned as a result of this IOC.
 *    IOC_PFS_SET_ID        This is used to set the file ID associated
 *                with a connection to a pseudo-filesystem server.
 *                There will be a naming connection, and perhaps
 *                many more pdev-like connections that represent
 *                files.  The ID set by this call we be passed in
 *                as the 'prefixID' and 'rootID' fields of
 *                the arguments to naming operations.  If this
 *                call is not used then the kernel's own
 *                fileIDs (which are unique, anyway) are used.
 *    IOC_PFS_PASS_STREAM    This is used instead of IOC_PDEV_REPLY to
 *                respond to a PFS_OPEN request.  This reply
 *                passes the stream indicated by the input
 *                streamID to the client as the result of its
 *                open request.  Thus the pseudo-filesystem
 *                server can open a file/device/whatever on
 *                behalf of its client and return the open file.
 *                The pseudo-filesystem server won't see any
 *                more I/O operations, or the close.
a266 3
#define IOC_PFS_OPEN        (IOC_PDEV | 0x7)
#define IOC_PFS_SET_ID        (IOC_PDEV | 0x8)
#define IOC_PFS_PASS_STREAM    (IOC_PDEV | 0x9)
@


1.10
log
@Added gid to Pdev_SetAttrParam so pdev handler can check
\both uid and gid before setting attributes.
@
text
@d54 1
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 * $Header: /sprite/src/lib/include.new/dev/RCS/pdev.h,v 1.9 88/10/19 14:25:06 brent Exp $ SPRITE (Berkeley)
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@


1.9
log
@Moved extern for tracing variable to library header file.
This file just have stuff for kernel/server interface.
@
text
@d54 1
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 * $Header: /sprite/src/lib/include.new/dev/RCS/pdev.h,v 1.8 88/10/19 14:12:53 brent Exp Locker: brent $ SPRITE (Berkeley)
d186 3
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 * PDEV_SET_ATTR request parameters.
d194 1
@


1.8
log
@Added pfsTraceNaming so clients of the library can have control
over tracing.
@
text
@d54 1
a54 1
 * $Header: /sprite/src/lib/include.new/dev/RCS/pdev.h,v 1.7 88/10/18 13:52:30 brent Exp Locker: brent $ SPRITE (Berkeley)
a67 6

/*
 * If pfsTraceNaming is set the lookup operations to a pseudo-filesystem
 * server are logged to standard output.
 */
extern int pfsTraceNaming;
@


1.7
log
@Added #define PDEV_NUM_OPS for use in the library.
@
text
@d54 1
a54 1
 * $Header: /sprite/src/lib/include.new/dev/RCS/pdev.h,v 1.6 88/10/16 13:21:13 brent Exp $ SPRITE (Berkeley)
d68 6
@


1.6
log
@Added IOC_PFS_SET_ID which is used to set the fileID associated
with a pseudo-filesystem connection.
@
text
@d54 1
a54 1
 * $Header: /sprite/src/lib/include.new/dev/RCS/pdev.h,v 1.5 88/10/14 10:30:23 brent Exp Locker: brent $ SPRITE (Berkeley)
d125 2
@


1.5
log
@Updated includes.
@
text
@d54 1
a54 1
 * $Header: pdev.h,v 1.4 88/10/13 17:24:23 brent Exp $ SPRITE (Berkeley)
d322 9
d338 2
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#define IOC_PFS_PASS_STREAM    (IOC_PDEV | 0x8)
@


1.4
log
@Added IOControls for completing pseudo-filesystem opens.
Added get/set attributes support
@
text
@d54 1
a54 1
 * $Header: pdev.h,v 1.3 88/10/10 12:17:28 brent Exp $ SPRITE (Berkeley)
d61 1
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d206 1
a206 1
    int        reserved;    /* Extra */
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} Pdev_SetAttrData;
@


1.3
log
@Added request-response commands for pseudo-filesystems,
and generalized message header so it can be used cleanly
for both classes of commands.
@
text
@d54 1
a54 1
 * $Header: pdev.h,v 1.2 88/08/26 15:38:27 brent Exp $ SPRITE (Berkeley)
d89 2
d92 1
a92 1
 * Pseudo-filesystem operations
d94 2
a95 2
 *    PFS_GET_ATTR        Get the attributes of a file...
 *    PFS_SET_ATTR        Set the attributes of a file...
d112 2
d115 1
a115 1
    PFS_GET_ATTR,
d228 13
d300 18
d327 2
@


1.2
log
@Cleaned up structures and added byteOrder parameter for PDEV_IOCTL
@
text
@d4 2
a5 1
 *    Declarations for pseudo-devices.  A pseudo-device is a special file
d15 4
d54 1
a54 1
 * $Header: pdev.h,v 2.4 88/03/31 10:00:25 brent Exp $ SPRITE (Berkeley)
d62 6
d69 13
a81 2
 * Type of operation requested by a client.  (There are typedefs below
 *    that are used to marshal parameters to these calls.)
d88 12
a99 1
 *    PDEV_IOCTL        Special operation on the pseudo-device.
d110 9
d122 1
a122 1
 * The server gets a 'control stream' back when opening the pseudo-device.
d181 2
d186 1
a186 1
    unsigned int magic;        /* == PDEV_REQUEST_MAGIC */
d193 4
d206 16
@


1.1
log
@Initial revision
@
text
@d23 1
a23 1
 *    streamID for a "server stream" that the server uses to communicate
d25 1
a25 1
 *    These streams are used by the server to read request messages
d28 11
a38 10
 *    The server learns of new requests from clients indirectly; the requests
 *    are placed into a buffer, along with their data, and the server learns
 *    about these additions by reading messages that contain 'firstByte'
 *    and 'lastByte' offsets into the buffer.  This buffered interface lets
 *    the kernel stack up many requests (writes, in particular) before a
 *    context switch is required to the server program.  Of course, this also
 *    lets the server handle all the queued requests at one time.  When the
 *    server has handled requests it updates the 'firstByte' pointer by
 *    making a IOC_PDEV_SET_PTRS IOControl on the private stream for the
 *    client.
d40 4
a43 4
 * There can also be a read ahead buffer for a pseudo-device.  This is
 * filled with data by the server program that is to be read by the client,
 * and the kernel moves data from this (server address space) buffer to
 * the client's buffer.
d62 1
a62 1
 *    PDEV_DUP        OBSOLETE.
d72 1
a72 1
    PDEV_DUP,            /* XXX going away, this is a placeholder */
d86 1
a86 1
    unsigned int    magic;    /* == PDEV_NOTIFY_MAGIC */
d88 1
d104 2
a105 1
    int clientID;        /* Unique ID for the client. XXX for old junk */
a107 6
typedef struct Pdev_WaitInfo {    /* XXX for old stuff */
    int hostID;
    Proc_PID    pid;
    int    token;
} Pdev_WaitInfo;

d115 3
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    int offset;        /* Byte offset for the transfer, the length of
             * the transfer is implied by the sizes in the
             * Request header. */
    Pdev_WaitInfo wait;    /* XXX */
d119 2
a122 8
typedef struct {
    int offset;        /* Byte offset for the transfer, the length of
             * the transfer is implied by the sizes in the
             * Request header. */
    unsigned int familyID;    /* Can be used to enforce controlling tty */
    Proc_PID procID;    /* Needed for signalling, etc. */
} Pdev_NewRWParam;

d126 1
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typedef struct {
    int        command;    /* I/O control command #. */
    unsigned int familyID;    /* Can be used to enforce controlling tty */
    Proc_PID procID;        /* Process id of calling process */
} Pdev_NewIOCParam;

d144 5
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    int        requestSize;    /* Size of the request data that immediately
                 * follows this request header. */
    int        replySize;    /* Max size of the reply expected. */
d157 1
a157 14
typedef struct {
    unsigned int magic;        /* == PDEV_REQUEST_MAGIC */
    Pdev_Op    operation;    /* What action is requested. */
    int        messageSize;    /* The complete size of the request header
                 * plus data, plus padding for alignment */
    int        requestSize;    /* Size of data following this header */
    int        replySize;    /* Max size of the reply data expected. */
    union {            /* Additional parameters to the operation. */
    Pdev_OpenParam        open;
    Pdev_NewRWParam        read;
    Pdev_NewRWParam        write;
    Pdev_NewIOCParam    ioctl;
    } param;
} Pdev_NewRequest;
a158 2
#define PDEV_REQUEST_MAGIC    0x7265717C

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    int        replySize;    /* Size of the data that follows, if any */
} Pdev_Reply;

typedef struct Pdev_NewReply {
    unsigned int magic;        /* == PDEV_REPLY_MAGIC */
    ReturnStatus status;    /* Return status of remote call */
    int        selectBits;    /* Return select state bits */
d171 2
a172 1
} Pdev_NewReply;
d174 1
a174 5
#define PDEV_REPLY_MAGIC    0x52455059
/*
 * For convenience to the Write reply, this reply struct
 * is defined for returning one int of reply data.
 */
a175 8
typedef struct Pdev_EasyReply {
    unsigned int magic;    /* == PDEV_REPLY_MAGIC */
    ReturnStatus status;
    int        selectBits;
    int        replySize;    /* please set to sizeof(int) !! */
    int        data;
} Pdev_EasyReply;

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 *                that you read from the request stream.
d205 1
a205 1
 *                The input buffer contains a Pdev_NewReply.  This
d242 1
a258 1
#define PDEV_BUF_PTR_MAGIC_OLD    0x3C46DF15
@