prio.h

Netscape NSPR库源码

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

/*
 * File:     prio.h
 *
 * Description:    PR i/o related stuff, such as file system access, file
 *         i/o, socket i/o, etc.
 */

#ifndef prio_h___
#define prio_h___

#include "prlong.h"
#include "prtime.h"
#include "prinrval.h"
#include "prinet.h"

PR_BEGIN_EXTERN_C

/* Typedefs */
typedef struct PRDir            PRDir;
typedef struct PRDirEntry       PRDirEntry;
typedef struct PRFileDesc       PRFileDesc;
typedef struct PRFileInfo       PRFileInfo;
typedef struct PRFileInfo64     PRFileInfo64;
typedef union  PRNetAddr        PRNetAddr;
typedef struct PRIOMethods      PRIOMethods;
typedef struct PRPollDesc       PRPollDesc;
typedef struct PRFilePrivate    PRFilePrivate;
typedef struct PRSendFileData   PRSendFileData;

/*
***************************************************************************
** The file descriptor.
** This is the primary structure to represent any active open socket,
** whether it be a normal file or a network connection. Such objects
** are stackable (or layerable). Each layer may have its own set of
** method pointers and context private to that layer. All each layer
** knows about its neighbors is how to get to their method table.
***************************************************************************
*/

typedef PRIntn PRDescIdentity;          /* see: Layering file descriptors */

struct PRFileDesc {
    const PRIOMethods *methods;         /* the I/O methods table */
    PRFilePrivate *secret;              /* layer dependent data */
    PRFileDesc *lower, *higher;         /* pointers to adjacent layers */
    void (PR_CALLBACK *dtor)(PRFileDesc *fd);
                                        /* A destructor function for layer */
    PRDescIdentity identity;            /* Identity of this particular layer  */
};

/*
***************************************************************************
** PRTransmitFileFlags
**
** Flags for PR_TransmitFile.  Pass PR_TRANSMITFILE_CLOSE_SOCKET to
** PR_TransmitFile if the connection should be closed after the file
** is transmitted.
***************************************************************************
*/
typedef enum PRTransmitFileFlags {
    PR_TRANSMITFILE_KEEP_OPEN = 0,    /* socket is left open after file
                                       * is transmitted. */
    PR_TRANSMITFILE_CLOSE_SOCKET = 1  /* socket is closed after file
                                       * is transmitted. */
} PRTransmitFileFlags;

/*
**************************************************************************
** Macros for PRNetAddr
**
** Address families: PR_AF_INET, PR_AF_INET6, PR_AF_LOCAL
** IP addresses: PR_INADDR_ANY, PR_INADDR_LOOPBACK, PR_INADDR_BROADCAST
**************************************************************************
*/

#ifdef WIN32

#define PR_AF_INET 2
#define PR_AF_LOCAL 1
#define PR_INADDR_ANY (unsigned long)0x00000000
#define PR_INADDR_LOOPBACK 0x7f000001
#define PR_INADDR_BROADCAST (unsigned long)0xffffffff

#else /* WIN32 */

#define PR_AF_INET AF_INET
#define PR_AF_LOCAL AF_UNIX
#define PR_INADDR_ANY INADDR_ANY
#define PR_INADDR_LOOPBACK INADDR_LOOPBACK
#define PR_INADDR_BROADCAST INADDR_BROADCAST

#endif /* WIN32 */

/*
** Define PR_AF_INET6 in prcpucfg.h with the same
** value as AF_INET6 on platforms with IPv6 support.
** Otherwise define it here.
*/
#ifndef PR_AF_INET6
#define PR_AF_INET6 100
#endif

/*
**************************************************************************
** A network address
**
** Only Internet Protocol (IPv4 and IPv6) addresses are supported.
** The address family must always represent IPv4 (AF_INET, probably == 2)
** or IPv6 (AF_INET6).
**************************************************************************
*************************************************************************/

struct PRIPv6Addr {
	union {
		PRUint8  _S6_u8[16];
		PRUint16 _S6_u16[8];
		PRUint32 _S6_u32[4];
		PRUint64 _S6_u64[2];
	} _S6_un;
};
#define pr_s6_addr		_S6_un._S6_u8
#define pr_s6_addr16	_S6_un._S6_u16
#define pr_s6_addr32	_S6_un._S6_u32
#define pr_s6_addr64 	_S6_un._S6_u64

typedef struct PRIPv6Addr PRIPv6Addr;

union PRNetAddr {
    struct {
        PRUint16 family;                /* address family (0x00ff maskable) */
#ifdef XP_BEOS
        char data[10];                  /* Be has a smaller structure */
#else
        char data[14];                  /* raw address data */
#endif
    } raw;
    struct {
        PRUint16 family;                /* address family (AF_INET) */
        PRUint16 port;                  /* port number */
        PRUint32 ip;                    /* The actual 32 bits of address */
#ifdef XP_BEOS
        char pad[4];                    /* Be has a smaller structure */
#else
        char pad[8];
#endif
    } inet;
    struct {
        PRUint16 family;                /* address family (AF_INET6) */
        PRUint16 port;                  /* port number */
        PRUint32 flowinfo;              /* routing information */
        PRIPv6Addr ip;                  /* the actual 128 bits of address */
        PRUint32 scope_id;              /* set of interfaces for a scope */
    } ipv6;
#if defined(XP_UNIX)
    struct {                            /* Unix domain socket address */
        PRUint16 family;                /* address family (AF_UNIX) */
        char path[104];                 /* null-terminated pathname */
    } local;
#endif
};

/*
***************************************************************************
** PRSockOption
**
** The file descriptors can have predefined options set after they file
** descriptor is created to change their behavior. Only the options in
** the following enumeration are supported.
***************************************************************************
*/
typedef enum PRSockOption
{
    PR_SockOpt_Nonblocking,     /* nonblocking io */
    PR_SockOpt_Linger,          /* linger on close if data present */
    PR_SockOpt_Reuseaddr,       /* allow local address reuse */
    PR_SockOpt_Keepalive,       /* keep connections alive */
    PR_SockOpt_RecvBufferSize,  /* send buffer size */
    PR_SockOpt_SendBufferSize,  /* receive buffer size */

    PR_SockOpt_IpTimeToLive,    /* time to live */
    PR_SockOpt_IpTypeOfService, /* type of service and precedence */

    PR_SockOpt_AddMember,       /* add an IP group membership */
    PR_SockOpt_DropMember,      /* drop an IP group membership */
    PR_SockOpt_McastInterface,  /* multicast interface address */
    PR_SockOpt_McastTimeToLive, /* multicast timetolive */
    PR_SockOpt_McastLoopback,   /* multicast loopback */

    PR_SockOpt_NoDelay,         /* don't delay send to coalesce packets */
    PR_SockOpt_MaxSegment,      /* maximum segment size */
    PR_SockOpt_Broadcast,       /* enable broadcast */
    PR_SockOpt_Last
} PRSockOption;

typedef struct PRLinger {
	PRBool polarity;		    /* Polarity of the option's setting */
	PRIntervalTime linger;	    /* Time to linger before closing */
} PRLinger;

typedef struct PRMcastRequest {
	PRNetAddr mcaddr;			/* IP multicast address of group */
	PRNetAddr ifaddr;			/* local IP address of interface */
} PRMcastRequest;

typedef struct PRSocketOptionData
{
    PRSockOption option;
    union
    {
        PRUintn ip_ttl;             /* IP time to live */
        PRUintn mcast_ttl;          /* IP multicast time to live */
        PRUintn tos;                /* IP type of service and precedence */
        PRBool non_blocking;        /* Non-blocking (network) I/O */
        PRBool reuse_addr;          /* Allow local address reuse */
        PRBool keep_alive;          /* Keep connections alive */
        PRBool mcast_loopback;      /* IP multicast loopback */
        PRBool no_delay;            /* Don't delay send to coalesce packets */
        PRBool broadcast;           /* Enable broadcast */
        PRSize max_segment;         /* Maximum segment size */
        PRSize recv_buffer_size;    /* Receive buffer size */
        PRSize send_buffer_size;    /* Send buffer size */
        PRLinger linger;            /* Time to linger on close if data present */
        PRMcastRequest add_member;  /* add an IP group membership */
        PRMcastRequest drop_member; /* Drop an IP group membership */
        PRNetAddr mcast_if;         /* multicast interface address */
    } value;
} PRSocketOptionData;

/*
***************************************************************************
** PRIOVec
**
** The I/O vector is used by the write vector method to describe the areas
** that are affected by the ouput operation.
***************************************************************************
*/
typedef struct PRIOVec {
    char *iov_base;
    int iov_len;
} PRIOVec;

/*
***************************************************************************
** Discover what type of socket is being described by the file descriptor.
***************************************************************************
*/
typedef enum PRDescType
{
    PR_DESC_FILE = 1,
    PR_DESC_SOCKET_TCP = 2,
    PR_DESC_SOCKET_UDP = 3,
    PR_DESC_LAYERED = 4,
    PR_DESC_PIPE = 5
} PRDescType;

typedef enum PRSeekWhence {
    PR_SEEK_SET = 0,
    PR_SEEK_CUR = 1,
    PR_SEEK_END = 2
} PRSeekWhence;

NSPR_API(PRDescType) PR_GetDescType(PRFileDesc *file);

/*
***************************************************************************
** PRIOMethods
**
** The I/O methods table provides procedural access to the functions of
** the file descriptor. It is the responsibility of a layer implementor
** to provide suitable functions at every entry point. If a layer provides
** no functionality, it should call the next lower(higher) function of the
** same name (e.g., return fd->lower->method->close(fd->lower));
**
** Not all functions are implemented for all types of files. In cases where
** that is true, the function will return a error indication with an error
** code of PR_INVALID_METHOD_ERROR.
***************************************************************************
*/

typedef PRStatus (PR_CALLBACK *PRCloseFN)(PRFileDesc *fd);
typedef PRInt32 (PR_CALLBACK *PRReadFN)(PRFileDesc *fd, void *buf, PRInt32 amount);
typedef PRInt32 (PR_CALLBACK *PRWriteFN)(PRFileDesc *fd, const void *buf, PRInt32 amount);
typedef PRInt32 (PR_CALLBACK *PRAvailableFN)(PRFileDesc *fd);
typedef PRInt64 (PR_CALLBACK *PRAvailable64FN)(PRFileDesc *fd);
typedef PRStatus (PR_CALLBACK *PRFsyncFN)(PRFileDesc *fd);
typedef PROffset32 (PR_CALLBACK *PRSeekFN)(PRFileDesc *fd, PROffset32 offset, PRSeekWhence how);
typedef PROffset64 (PR_CALLBACK *PRSeek64FN)(PRFileDesc *fd, PROffset64 offset, PRSeekWhence how);
typedef PRStatus (PR_CALLBACK *PRFileInfoFN)(PRFileDesc *fd, PRFileInfo *info);
typedef PRStatus (PR_CALLBACK *PRFileInfo64FN)(PRFileDesc *fd, PRFileInfo64 *info);
typedef PRInt32 (PR_CALLBACK *PRWritevFN)(
    PRFileDesc *fd, const PRIOVec *iov, PRInt32 iov_size,
    PRIntervalTime timeout);
typedef PRStatus (PR_CALLBACK *PRConnectFN)(
    PRFileDesc *fd, const PRNetAddr *addr, PRIntervalTime timeout);
typedef PRFileDesc* (PR_CALLBACK *PRAcceptFN) (
    PRFileDesc *fd, PRNetAddr *addr, PRIntervalTime timeout);
typedef PRStatus (PR_CALLBACK *PRBindFN)(PRFileDesc *fd, const PRNetAddr *addr);
typedef PRStatus (PR_CALLBACK *PRListenFN)(PRFileDesc *fd, PRIntn backlog);
typedef PRStatus (PR_CALLBACK *PRShutdownFN)(PRFileDesc *fd, PRIntn how);