FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc.h

     /*      $NetBSD: svc.h,v 1.17 2000/06/02 22:57:56 fvdl Exp $    */
     
     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 2009, Sun Microsystems, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without 
     * modification, are permitted provided that the following conditions are met:
     * - Redistributions of source code must retain the above copyright notice, 
     *   this list of conditions and the following disclaimer.
     * - Redistributions in binary form must reproduce the above copyright notice, 
     *   this list of conditions and the following disclaimer in the documentation 
     *   and/or other materials provided with the distribution.
     * - Neither the name of Sun Microsystems, Inc. nor the names of its 
     *   contributors may be used to endorse or promote products derived 
     *   from this software without specific prior written permission.
     * 
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
     * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
     * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
     * POSSIBILITY OF SUCH DAMAGE.
     *
     *      from: @(#)svc.h 1.35 88/12/17 SMI
     *      from: @(#)svc.h      1.27    94/04/25 SMI
     * $FreeBSD$
     */
    
    /*
     * svc.h, Server-side remote procedure call interface.
     *
     * Copyright (C) 1986-1993 by Sun Microsystems, Inc.
     */
    
    #ifndef _RPC_SVC_H
    #define _RPC_SVC_H
    #include <sys/cdefs.h>
    
    #ifdef _KERNEL
    #include <sys/queue.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    #include <sys/_sx.h>
    #include <sys/condvar.h>
    #include <sys/sysctl.h>
    #endif
    
    /*
     * This interface must manage two items concerning remote procedure calling:
     *
     * 1) An arbitrary number of transport connections upon which rpc requests
     * are received.  The two most notable transports are TCP and UDP;  they are
     * created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
     * they in turn call xprt_register and xprt_unregister.
     *
     * 2) An arbitrary number of locally registered services.  Services are
     * described by the following four data: program number, version number,
     * "service dispatch" function, a transport handle, and a boolean that
     * indicates whether or not the exported program should be registered with a
     * local binder service;  if true the program's number and version and the
     * port number from the transport handle are registered with the binder.
     * These data are registered with the rpc svc system via svc_register.
     *
     * A service's dispatch function is called whenever an rpc request comes in
     * on a transport.  The request's program and version numbers must match
     * those of the registered service.  The dispatch function is passed two
     * parameters, struct svc_req * and SVCXPRT *, defined below.
     */
    
    /*
     *      Service control requests
     */
    #define SVCGET_VERSQUIET        1
    #define SVCSET_VERSQUIET        2
    #define SVCGET_CONNMAXREC       3
    #define SVCSET_CONNMAXREC       4
    
    /*
     * Operations for rpc_control().
     */
    #define RPC_SVC_CONNMAXREC_SET  0       /* set max rec size, enable nonblock */
    #define RPC_SVC_CONNMAXREC_GET  1
    
    enum xprt_stat {
            XPRT_DIED,
            XPRT_MOREREQS,
            XPRT_IDLE
    };
    
    struct __rpc_svcxprt;
    struct mbuf;
   
   struct xp_ops {
   #ifdef _KERNEL
           /* receive incoming requests */
           bool_t  (*xp_recv)(struct __rpc_svcxprt *, struct rpc_msg *,
               struct sockaddr **, struct mbuf **);
           /* get transport status */
           enum xprt_stat (*xp_stat)(struct __rpc_svcxprt *);
           /* get transport acknowledge sequence */
           bool_t (*xp_ack)(struct __rpc_svcxprt *, uint32_t *);
           /* send reply */
           bool_t  (*xp_reply)(struct __rpc_svcxprt *, struct rpc_msg *,
               struct sockaddr *, struct mbuf *, uint32_t *);
           /* destroy this struct */
           void    (*xp_destroy)(struct __rpc_svcxprt *);
           /* catch-all function */
           bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int, void *);
   #else
           /* receive incoming requests */
           bool_t  (*xp_recv)(struct __rpc_svcxprt *, struct rpc_msg *);
           /* get transport status */
           enum xprt_stat (*xp_stat)(struct __rpc_svcxprt *);
           /* get arguments */
           bool_t  (*xp_getargs)(struct __rpc_svcxprt *, xdrproc_t, void *);
           /* send reply */
           bool_t  (*xp_reply)(struct __rpc_svcxprt *, struct rpc_msg *);
           /* free mem allocated for args */
           bool_t  (*xp_freeargs)(struct __rpc_svcxprt *, xdrproc_t, void *);
           /* destroy this struct */
           void    (*xp_destroy)(struct __rpc_svcxprt *);
   #endif
   };
   
   #ifndef _KERNEL
   struct xp_ops2 {
           /* catch-all function */
           bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int, void *);
   };
   #endif
   
   #ifdef _KERNEL
   struct __rpc_svcpool;
   struct __rpc_svcgroup;
   struct __rpc_svcthread;
   #endif
   
   /*
    * Server side transport handle. In the kernel, transports have a
    * reference count which tracks the number of currently assigned
    * worker threads plus one for the service pool's reference.
    * For NFSv4.1 sessions, a reference is also held for a backchannel.
    * xp_p2 - Points to the CLIENT structure for the RPC server end
    *         (the client end for callbacks).
    *         Points to the private structure (cl_private) for the
    *         CLIENT structure for the RPC client end (the server
    *         end for callbacks).
    */
   typedef struct __rpc_svcxprt {
   #ifdef _KERNEL
           volatile u_int  xp_refs;
           struct sx       xp_lock;
           struct __rpc_svcpool *xp_pool;  /* owning pool (see below) */
           struct __rpc_svcgroup *xp_group; /* owning group (see below) */
           TAILQ_ENTRY(__rpc_svcxprt) xp_link;
           TAILQ_ENTRY(__rpc_svcxprt) xp_alink;
           bool_t          xp_registered;  /* xprt_register has been called */
           bool_t          xp_active;      /* xprt_active has been called */
           struct __rpc_svcthread *xp_thread; /* assigned service thread */
           struct socket*  xp_socket;
           const struct xp_ops *xp_ops;
           char            *xp_netid;      /* network token */
           struct sockaddr_storage xp_ltaddr; /* local transport address */
           struct sockaddr_storage xp_rtaddr; /* remote transport address */
           void            *xp_p1;         /* private: for use by svc ops */
           void            *xp_p2;         /* private: for use by svc ops */
           void            *xp_p3;         /* private: for use by svc lib */
           int             xp_type;        /* transport type */
           int             xp_idletimeout; /* idle time before closing */
           time_t          xp_lastactive;  /* time of last RPC */
           u_int64_t       xp_sockref;     /* set by nfsv4 to identify socket */
           int             xp_upcallset;   /* socket upcall is set up */
           uint32_t        xp_snd_cnt;     /* # of bytes to send to socket */
           uint32_t        xp_snt_cnt;     /* # of bytes sent to socket */
   #else
           int             xp_fd;
           u_short         xp_port;         /* associated port number */
           const struct xp_ops *xp_ops;
           int             xp_addrlen;      /* length of remote address */
           struct sockaddr_in xp_raddr;     /* remote addr. (backward ABI compat) */
           /* XXX - fvdl stick this here for ABI backward compat reasons */
           const struct xp_ops2 *xp_ops2;
           char            *xp_tp;          /* transport provider device name */
           char            *xp_netid;       /* network token */
           struct netbuf   xp_ltaddr;       /* local transport address */
           struct netbuf   xp_rtaddr;       /* remote transport address */
           struct opaque_auth xp_verf;      /* raw response verifier */
           void            *xp_p1;          /* private: for use by svc ops */
           void            *xp_p2;          /* private: for use by svc ops */
           void            *xp_p3;          /* private: for use by svc lib */
           int             xp_type;         /* transport type */
   #endif
   } SVCXPRT;
   
   /*
    * Interface to server-side authentication flavors.
    */
   typedef struct __rpc_svcauth {
           struct svc_auth_ops {
   #ifdef _KERNEL
                   int   (*svc_ah_wrap)(struct __rpc_svcauth *,  struct mbuf **);
                   int   (*svc_ah_unwrap)(struct __rpc_svcauth *, struct mbuf **);
                   void  (*svc_ah_release)(struct __rpc_svcauth *);
   #else
                   int   (*svc_ah_wrap)(struct __rpc_svcauth *, XDR *,
                       xdrproc_t, caddr_t);
                   int   (*svc_ah_unwrap)(struct __rpc_svcauth *, XDR *,
                       xdrproc_t, caddr_t);
   #endif
           } *svc_ah_ops;
           void *svc_ah_private;
   } SVCAUTH;
   
   /*
    * Server transport extensions (accessed via xp_p3).
    */
   typedef struct __rpc_svcxprt_ext {
           int             xp_flags;       /* versquiet */
           SVCAUTH         xp_auth;        /* interface to auth methods */
   } SVCXPRT_EXT;
   
   #ifdef _KERNEL
   
   /*
    * The services list
    * Each entry represents a set of procedures (an rpc program).
    * The dispatch routine takes request structs and runs the
    * appropriate procedure.
    */
   struct svc_callout {
           TAILQ_ENTRY(svc_callout) sc_link;
           rpcprog_t           sc_prog;
           rpcvers_t           sc_vers;
           char               *sc_netid;
           void                (*sc_dispatch)(struct svc_req *, SVCXPRT *);
   };
   TAILQ_HEAD(svc_callout_list, svc_callout);
   
   /*
    * The services connection loss list
    * The dispatch routine takes request structs and runs the
    * appropriate procedure.
    */
   struct svc_loss_callout {
           TAILQ_ENTRY(svc_loss_callout) slc_link;
           void                (*slc_dispatch)(SVCXPRT *);
   };
   TAILQ_HEAD(svc_loss_callout_list, svc_loss_callout);
   
   /*
    * Service request
    */
   struct svc_req {
           STAILQ_ENTRY(svc_req) rq_link;  /* list of requests for a thread */
           struct __rpc_svcthread *rq_thread; /* thread which is to execute this */
           uint32_t        rq_xid;         /* RPC transaction ID */
           uint32_t        rq_prog;        /* service program number */
           uint32_t        rq_vers;        /* service protocol version */
           uint32_t        rq_proc;        /* the desired procedure */
           size_t          rq_size;        /* space used by request */
           struct mbuf     *rq_args;       /* XDR-encoded procedure arguments */
           struct opaque_auth rq_cred;     /* raw creds from the wire */
           struct opaque_auth rq_verf;     /* verifier for the reply */
           void            *rq_clntcred;   /* read only cooked cred */
           SVCAUTH         rq_auth;        /* interface to auth methods */
           SVCXPRT         *rq_xprt;       /* associated transport */
           struct sockaddr *rq_addr;       /* reply address or NULL if connected */
           void            *rq_p1;         /* application workspace */
           int             rq_p2;          /* application workspace */
           uint64_t        rq_p3;          /* application workspace */
           uint32_t        rq_reply_seq;   /* reply socket sequence # */
           char            rq_credarea[3*MAX_AUTH_BYTES];
   };
   STAILQ_HEAD(svc_reqlist, svc_req);
   
   #define svc_getrpccaller(rq)                                    \
           ((rq)->rq_addr ? (rq)->rq_addr :                        \
               (struct sockaddr *) &(rq)->rq_xprt->xp_rtaddr)
   
   /*
    * This structure is used to manage a thread which is executing
    * requests from a service pool. A service thread is in one of three
    * states:
    *
    *      SVCTHREAD_SLEEPING      waiting for a request to process
    *      SVCTHREAD_ACTIVE        processing a request
    *      SVCTHREAD_EXITING       exiting after finishing current request
    *
    * Threads which have no work to process sleep on the pool's sp_active
    * list. When a transport becomes active, it is assigned a service
    * thread to read and execute pending RPCs.
    */
   typedef struct __rpc_svcthread {
           struct mtx_padalign     st_lock; /* protects st_reqs field */
           struct __rpc_svcpool    *st_pool;
           SVCXPRT                 *st_xprt; /* transport we are processing */
           struct svc_reqlist      st_reqs;  /* RPC requests to execute */
           struct cv               st_cond; /* sleeping for work */
           LIST_ENTRY(__rpc_svcthread) st_ilink; /* idle threads list */
           LIST_ENTRY(__rpc_svcthread) st_alink; /* application thread list */
           int             st_p2;          /* application workspace */
           uint64_t        st_p3;          /* application workspace */
   } SVCTHREAD;
   LIST_HEAD(svcthread_list, __rpc_svcthread);
   
   /*
    * A thread group contain all information needed to assign subset of
    * transports to subset of threads.  On systems with many CPUs and many
    * threads that allows to reduce lock congestion and improve performance.
    * Hundreds of threads on dozens of CPUs sharing the single pool lock do
    * not scale well otherwise.
    */
   TAILQ_HEAD(svcxprt_list, __rpc_svcxprt);
   enum svcpool_state {
           SVCPOOL_INIT,           /* svc_run not called yet */
           SVCPOOL_ACTIVE,         /* normal running state */
           SVCPOOL_THREADWANTED,   /* new service thread requested */
           SVCPOOL_THREADSTARTING, /* new service thread started */
           SVCPOOL_CLOSING         /* svc_exit called */
   };
   typedef struct __rpc_svcgroup {
           struct mtx_padalign sg_lock;    /* protect the thread/req lists */
           struct __rpc_svcpool    *sg_pool;
           enum svcpool_state sg_state;    /* current pool state */
           struct svcxprt_list sg_xlist;   /* all transports in the group */
           struct svcxprt_list sg_active;  /* transports needing service */
           struct svcthread_list sg_idlethreads; /* idle service threads */
   
           int             sg_minthreads;  /* minimum service thread count */
           int             sg_maxthreads;  /* maximum service thread count */
           int             sg_threadcount; /* current service thread count */
           time_t          sg_lastcreatetime; /* when we last started a thread */
           time_t          sg_lastidlecheck;  /* when we last checked idle transports */
   } SVCGROUP;
   
   /*
    * In the kernel, we can't use global variables to store lists of
    * transports etc. since otherwise we could not have two unrelated RPC
    * services running, each on its own thread. We solve this by
    * importing a tiny part of a Solaris kernel concept, SVCPOOL.
    *
    * A service pool contains a set of transports and service callbacks
    * for a set of related RPC services. The pool handle should be passed
    * when creating new transports etc. Future work may include extending
    * this to support something similar to the Solaris multi-threaded RPC
    * server.
    */
   typedef SVCTHREAD *pool_assign_fn(SVCTHREAD *, struct svc_req *);
   typedef void pool_done_fn(SVCTHREAD *, struct svc_req *);
   #define SVC_MAXGROUPS   16
   typedef struct __rpc_svcpool {
           struct mtx_padalign sp_lock;    /* protect the transport lists */
           const char      *sp_name;       /* pool name (e.g. "nfsd", "NLM" */
           enum svcpool_state sp_state;    /* current pool state */
           struct proc     *sp_proc;       /* process which is in svc_run */
           struct svc_callout_list sp_callouts; /* (prog,vers)->dispatch list */
           struct svc_loss_callout_list sp_lcallouts; /* loss->dispatch list */
           int             sp_minthreads;  /* minimum service thread count */
           int             sp_maxthreads;  /* maximum service thread count */
   
           /*
            * Hooks to allow an application to control request to thread
            * placement.
            */
           pool_assign_fn  *sp_assign;
           pool_done_fn    *sp_done;
   
           /*
            * These variables are used to put an upper bound on the
            * amount of memory used by RPC requests which are queued
            * waiting for execution.
            */
           unsigned long   sp_space_low;
           unsigned long   sp_space_high;
           unsigned long   sp_space_used;
           unsigned long   sp_space_used_highest;
           bool_t          sp_space_throttled;
           int             sp_space_throttle_count;
   
           struct replay_cache *sp_rcache; /* optional replay cache */
           struct sysctl_ctx_list sp_sysctl;
   
           int             sp_groupcount;  /* Number of groups in the pool. */
           int             sp_nextgroup;   /* Next group to assign port. */
           SVCGROUP        sp_groups[SVC_MAXGROUPS]; /* Thread/port groups. */
   } SVCPOOL;
   
   #else
   
   /*
    * Service request
    */
   struct svc_req {
           uint32_t        rq_prog;        /* service program number */
           uint32_t        rq_vers;        /* service protocol version */
           uint32_t        rq_proc;        /* the desired procedure */
           struct opaque_auth rq_cred;     /* raw creds from the wire */
           void            *rq_clntcred;   /* read only cooked cred */
           SVCXPRT         *rq_xprt;       /* associated transport */
   };
   
   /*
    *  Approved way of getting address of caller
    */
   #define svc_getrpccaller(x) (&(x)->xp_rtaddr)
   
   #endif
   
   /*
    * Operations defined on an SVCXPRT handle
    *
    * SVCXPRT              *xprt;
    * struct rpc_msg       *msg;
    * xdrproc_t             xargs;
    * void *                argsp;
    */
   #ifdef _KERNEL
   
   #define SVC_ACQUIRE(xprt)                       \
           refcount_acquire(&(xprt)->xp_refs)
   
   #define SVC_RELEASE(xprt)                       \
           if (refcount_release(&(xprt)->xp_refs)) \
                   SVC_DESTROY(xprt)
   
   #define SVC_RECV(xprt, msg, addr, args)                 \
           (*(xprt)->xp_ops->xp_recv)((xprt), (msg), (addr), (args))
   
   #define SVC_STAT(xprt)                                  \
           (*(xprt)->xp_ops->xp_stat)(xprt)
   
   #define SVC_ACK(xprt, ack)                              \
           ((xprt)->xp_ops->xp_ack == NULL ? FALSE :       \
               ((ack) == NULL ? TRUE : (*(xprt)->xp_ops->xp_ack)((xprt), (ack))))
   
   #define SVC_REPLY(xprt, msg, addr, m, seq)                      \
           (*(xprt)->xp_ops->xp_reply) ((xprt), (msg), (addr), (m), (seq))
   
   #define SVC_DESTROY(xprt)                               \
           (*(xprt)->xp_ops->xp_destroy)(xprt)
   
   #define SVC_CONTROL(xprt, rq, in)                       \
           (*(xprt)->xp_ops->xp_control)((xprt), (rq), (in))
   
   #else
   
   #define SVC_RECV(xprt, msg)                             \
           (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
   #define svc_recv(xprt, msg)                             \
           (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
   
   #define SVC_STAT(xprt)                                  \
           (*(xprt)->xp_ops->xp_stat)(xprt)
   #define svc_stat(xprt)                                  \
           (*(xprt)->xp_ops->xp_stat)(xprt)
   
   #define SVC_GETARGS(xprt, xargs, argsp)                 \
           (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
   #define svc_getargs(xprt, xargs, argsp)                 \
           (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
   
   #define SVC_REPLY(xprt, msg)                            \
           (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
   #define svc_reply(xprt, msg)                            \
           (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
   
   #define SVC_FREEARGS(xprt, xargs, argsp)                \
           (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
   #define svc_freeargs(xprt, xargs, argsp)                \
           (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
   
   #define SVC_DESTROY(xprt)                               \
           (*(xprt)->xp_ops->xp_destroy)(xprt)
   #define svc_destroy(xprt)                               \
           (*(xprt)->xp_ops->xp_destroy)(xprt)
   
   #define SVC_CONTROL(xprt, rq, in)                       \
           (*(xprt)->xp_ops2->xp_control)((xprt), (rq), (in))
   
   #endif
   
   #define SVC_EXT(xprt)                                   \
           ((SVCXPRT_EXT *) xprt->xp_p3)
   
   #define SVC_AUTH(xprt)                                  \
           (SVC_EXT(xprt)->xp_auth)
   
   /*
    * Operations defined on an SVCAUTH handle
    */
   #ifdef _KERNEL
   #define SVCAUTH_WRAP(auth, mp)          \
           ((auth)->svc_ah_ops->svc_ah_wrap(auth, mp))
   #define SVCAUTH_UNWRAP(auth, mp)        \
           ((auth)->svc_ah_ops->svc_ah_unwrap(auth, mp))
   #define SVCAUTH_RELEASE(auth)   \
           ((auth)->svc_ah_ops->svc_ah_release(auth))
   #else
   #define SVCAUTH_WRAP(auth, xdrs, xfunc, xwhere)         \
           ((auth)->svc_ah_ops->svc_ah_wrap(auth, xdrs, xfunc, xwhere))
   #define SVCAUTH_UNWRAP(auth, xdrs, xfunc, xwhere)       \
           ((auth)->svc_ah_ops->svc_ah_unwrap(auth, xdrs, xfunc, xwhere))
   #endif
   
   /*
    * Service registration
    *
    * svc_reg(xprt, prog, vers, dispatch, nconf)
    *      const SVCXPRT *xprt;
    *      const rpcprog_t prog;
    *      const rpcvers_t vers;
    *      const void (*dispatch)();
    *      const struct netconfig *nconf;
    */
   
   __BEGIN_DECLS
   extern bool_t   svc_reg(SVCXPRT *, const rpcprog_t, const rpcvers_t,
                           void (*)(struct svc_req *, SVCXPRT *),
                           const struct netconfig *);
   __END_DECLS
   
   /*
    * Service un-registration
    *
    * svc_unreg(prog, vers)
    *      const rpcprog_t prog;
    *      const rpcvers_t vers;
    */
   
   __BEGIN_DECLS
   #ifdef _KERNEL
   extern void     svc_unreg(SVCPOOL *, const rpcprog_t, const rpcvers_t);
   #else
   extern void     svc_unreg(const rpcprog_t, const rpcvers_t);
   #endif
   __END_DECLS
   
   #ifdef _KERNEL
   /*
    * Service connection loss registration
    *
    * svc_loss_reg(xprt, dispatch)
    *      const SVCXPRT *xprt;
    *      const void (*dispatch)();
    */
   
   __BEGIN_DECLS
   extern bool_t   svc_loss_reg(SVCXPRT *, void (*)(SVCXPRT *));
   __END_DECLS
   
   /*
    * Service connection loss un-registration
    *
    * svc_loss_unreg(xprt, dispatch)
    *      const SVCXPRT *xprt;
    *      const void (*dispatch)();
    */
   
   __BEGIN_DECLS
   extern void     svc_loss_unreg(SVCPOOL *, void (*)(SVCXPRT *));
   __END_DECLS
   #endif
   
   /*
    * Transport registration.
    *
    * xprt_register(xprt)
    *      SVCXPRT *xprt;
    */
   __BEGIN_DECLS
   extern void     xprt_register(SVCXPRT *);
   __END_DECLS
   
   /*
    * Transport un-register
    *
    * xprt_unregister(xprt)
    *      SVCXPRT *xprt;
    */
   __BEGIN_DECLS
   extern void     xprt_unregister(SVCXPRT *);
   extern void     __xprt_unregister_unlocked(SVCXPRT *);
   __END_DECLS
   
   #ifdef _KERNEL
   
   /*
    * Called when a transport has pending requests.
    */
   __BEGIN_DECLS
   extern void     xprt_active(SVCXPRT *);
   extern void     xprt_inactive(SVCXPRT *);
   extern void     xprt_inactive_locked(SVCXPRT *);
   extern void     xprt_inactive_self(SVCXPRT *);
   __END_DECLS
   
   #endif
   
   /*
    * When the service routine is called, it must first check to see if it
    * knows about the procedure;  if not, it should call svcerr_noproc
    * and return.  If so, it should deserialize its arguments via
    * SVC_GETARGS (defined above).  If the deserialization does not work,
    * svcerr_decode should be called followed by a return.  Successful
    * decoding of the arguments should be followed the execution of the
    * procedure's code and a call to svc_sendreply.
    *
    * Also, if the service refuses to execute the procedure due to too-
    * weak authentication parameters, svcerr_weakauth should be called.
    * Note: do not confuse access-control failure with weak authentication!
    *
    * NB: In pure implementations of rpc, the caller always waits for a reply
    * msg.  This message is sent when svc_sendreply is called.
    * Therefore pure service implementations should always call
    * svc_sendreply even if the function logically returns void;  use
    * xdr.h - xdr_void for the xdr routine.  HOWEVER, tcp based rpc allows
    * for the abuse of pure rpc via batched calling or pipelining.  In the
    * case of a batched call, svc_sendreply should NOT be called since
    * this would send a return message, which is what batching tries to avoid.
    * It is the service/protocol writer's responsibility to know which calls are
    * batched and which are not.  Warning: responding to batch calls may
    * deadlock the caller and server processes!
    */
   
   __BEGIN_DECLS
   #ifdef _KERNEL
   extern bool_t   svc_sendreply(struct svc_req *, xdrproc_t, void *);
   extern bool_t   svc_sendreply_mbuf(struct svc_req *, struct mbuf *);
   extern void     svcerr_decode(struct svc_req *);
   extern void     svcerr_weakauth(struct svc_req *);
   extern void     svcerr_noproc(struct svc_req *);
   extern void     svcerr_progvers(struct svc_req *, rpcvers_t, rpcvers_t);
   extern void     svcerr_auth(struct svc_req *, enum auth_stat);
   extern void     svcerr_noprog(struct svc_req *);
   extern void     svcerr_systemerr(struct svc_req *);
   #else
   extern bool_t   svc_sendreply(SVCXPRT *, xdrproc_t, void *);
   extern void     svcerr_decode(SVCXPRT *);
   extern void     svcerr_weakauth(SVCXPRT *);
   extern void     svcerr_noproc(SVCXPRT *);
   extern void     svcerr_progvers(SVCXPRT *, rpcvers_t, rpcvers_t);
   extern void     svcerr_auth(SVCXPRT *, enum auth_stat);
   extern void     svcerr_noprog(SVCXPRT *);
   extern void     svcerr_systemerr(SVCXPRT *);
   #endif
   extern int      rpc_reg(rpcprog_t, rpcvers_t, rpcproc_t,
                           char *(*)(char *), xdrproc_t, xdrproc_t,
                           char *);
   __END_DECLS
   
   /*
    * Lowest level dispatching -OR- who owns this process anyway.
    * Somebody has to wait for incoming requests and then call the correct
    * service routine.  The routine svc_run does infinite waiting; i.e.,
    * svc_run never returns.
    * Since another (co-existent) package may wish to selectively wait for
    * incoming calls or other events outside of the rpc architecture, the
    * routine svc_getreq is provided.  It must be passed readfds, the
    * "in-place" results of a select system call (see select, section 2).
    */
   
   #ifndef _KERNEL
   /*
    * Global keeper of rpc service descriptors in use
    * dynamic; must be inspected before each call to select
    */
   extern int svc_maxfd;
   #ifdef FD_SETSIZE
   extern fd_set svc_fdset;
   #define svc_fds svc_fdset.fds_bits[0]   /* compatibility */
   #else
   extern int svc_fds;
   #endif /* def FD_SETSIZE */
   #endif
   
   /*
    * a small program implemented by the svc_rpc implementation itself;
    * also see clnt.h for protocol numbers.
    */
   __BEGIN_DECLS
   extern void rpctest_service(void);
   __END_DECLS
   
   __BEGIN_DECLS
   extern SVCXPRT *svc_xprt_alloc(void);
   extern void     svc_xprt_free(SVCXPRT *);
   #ifndef _KERNEL
   extern void     svc_getreq(int);
   extern void     svc_getreqset(fd_set *);
   extern void     svc_getreq_common(int);
   struct pollfd;
   extern void     svc_getreq_poll(struct pollfd *, int);
   extern void     svc_run(void);
   extern void     svc_exit(void);
   #else
   extern void     svc_run(SVCPOOL *);
   extern void     svc_exit(SVCPOOL *);
   extern bool_t   svc_getargs(struct svc_req *, xdrproc_t, void *);
   extern bool_t   svc_freeargs(struct svc_req *, xdrproc_t, void *);
   extern void     svc_freereq(struct svc_req *);
   
   #endif
   __END_DECLS
   
   /*
    * Socket to use on svcxxx_create call to get default socket
    */
   #define RPC_ANYSOCK     -1
   #define RPC_ANYFD       RPC_ANYSOCK
   
   /*
    * These are the existing service side transport implementations
    */
   
   __BEGIN_DECLS
   
   #ifdef _KERNEL
   
   /*
    * Create a new service pool.
    */
   extern SVCPOOL* svcpool_create(const char *name,
       struct sysctl_oid_list *sysctl_base);
   
   /*
    * Destroy a service pool, including all registered transports.
    */
   extern void svcpool_destroy(SVCPOOL *pool);
   
   /*
    * Close a service pool.  Similar to svcpool_destroy(), but it does not
    * free the data structures.  As such, the pool can be used again.
    */
   extern void svcpool_close(SVCPOOL *pool);
   
   /*
    * Transport independent svc_create routine.
    */
   extern int svc_create(SVCPOOL *, void (*)(struct svc_req *, SVCXPRT *),
       const rpcprog_t, const rpcvers_t, const char *);
   /*
    *      void (*dispatch)();             -- dispatch routine
    *      const rpcprog_t prognum;        -- program number
    *      const rpcvers_t versnum;        -- version number
    *      const char *nettype;            -- network type
    */
   
   
   /*
    * Generic server creation routine. It takes a netconfig structure
    * instead of a nettype.
    */
   
   extern SVCXPRT *svc_tp_create(SVCPOOL *, void (*)(struct svc_req *, SVCXPRT *),
       const rpcprog_t, const rpcvers_t, const char *uaddr,
       const struct netconfig *);
           /*
            * void (*dispatch)();            -- dispatch routine
            * const rpcprog_t prognum;       -- program number
            * const rpcvers_t versnum;       -- version number
            * const char *uaddr;             -- universal address of service
            * const struct netconfig *nconf; -- netconfig structure
            */
   
   extern SVCXPRT *svc_dg_create(SVCPOOL *, struct socket *,
       const size_t, const size_t);
           /*
            * struct socket *;                             -- open connection
            * const size_t sendsize;                        -- max send size
            * const size_t recvsize;                        -- max recv size
            */
   
   extern SVCXPRT *svc_vc_create(SVCPOOL *, struct socket *,
       const size_t, const size_t);
           /*
            * struct socket *;                             -- open connection
            * const size_t sendsize;                        -- max send size
            * const size_t recvsize;                        -- max recv size
            */
   
   extern SVCXPRT *svc_vc_create_backchannel(SVCPOOL *);
   
   extern void *clnt_bck_create(struct socket *, const rpcprog_t, const rpcvers_t);
           /*
            * struct socket *;                     -- server transport socket
            * const rpcprog_t prog;                -- RPC program number
            * const rpcvers_t vers;                -- RPC program version
            */
   
   /*
    * Generic TLI create routine
    */
   extern SVCXPRT *svc_tli_create(SVCPOOL *, struct socket *,
       const struct netconfig *, const struct t_bind *, const size_t, const size_t);
   /*
    *      struct socket * so;             -- connection end point
    *      const struct netconfig *nconf;  -- netconfig structure for network
    *      const struct t_bind *bindaddr;  -- local bind address
    *      const size_t sendsz;             -- max sendsize
    *      const size_t recvsz;             -- max recvsize
    */
   
   #else /* !_KERNEL */
   
   /*
    * Transport independent svc_create routine.
    */
   extern int svc_create(void (*)(struct svc_req *, SVCXPRT *),
                              const rpcprog_t, const rpcvers_t, const char *);
   /*
    *      void (*dispatch)();             -- dispatch routine
    *      const rpcprog_t prognum;        -- program number
    *      const rpcvers_t versnum;        -- version number
    *      const char *nettype;            -- network type
    */
   
   
   /*
    * Generic server creation routine. It takes a netconfig structure
    * instead of a nettype.
    */
   
   extern SVCXPRT *svc_tp_create(void (*)(struct svc_req *, SVCXPRT *),
                                      const rpcprog_t, const rpcvers_t,
                                      const struct netconfig *);
           /*
            * void (*dispatch)();            -- dispatch routine
            * const rpcprog_t prognum;       -- program number
            * const rpcvers_t versnum;       -- version number
            * const struct netconfig *nconf; -- netconfig structure
            */
   
   /*
    * Generic TLI create routine
    */
   extern SVCXPRT *svc_tli_create(const int, const struct netconfig *,
                                  const struct t_bind *, const u_int,
                                  const u_int);
   /*
    *      const int fd;                   -- connection end point
    *      const struct netconfig *nconf;  -- netconfig structure for network
    *      const struct t_bind *bindaddr;  -- local bind address
    *      const u_int sendsz;             -- max sendsize
    *      const u_int recvsz;             -- max recvsize
    */
   
   /*
    * Connectionless and connectionful create routines
    */
   
   extern SVCXPRT *svc_vc_create(const int, const u_int, const u_int);
   /*
    *      const int fd;                           -- open connection end point
    *      const u_int sendsize;                   -- max send size
    *      const u_int recvsize;                   -- max recv size
    */
   
   /*
    * Added for compatibility to old rpc 4.0. Obsoleted by svc_vc_create().
    */
   extern SVCXPRT *svcunix_create(int, u_int, u_int, char *);
   
   extern SVCXPRT *svc_dg_create(const int, const u_int, const u_int);
           /*
            * const int fd;                                -- open connection
            * const u_int sendsize;                        -- max send size
            * const u_int recvsize;                        -- max recv size
            */
   
   
   /*
    * the routine takes any *open* connection
    * descriptor as its first input and is used for open connections.
    */
   extern SVCXPRT *svc_fd_create(const int, const u_int, const u_int);
   /*
    *      const int fd;                           -- open connection end point
    *      const u_int sendsize;                   -- max send size
    *      const u_int recvsize;                   -- max recv size
    */
   
   /*
    * Added for compatibility to old rpc 4.0. Obsoleted by svc_fd_create().
    */
   extern SVCXPRT *svcunixfd_create(int, u_int, u_int);
   
   /*
    * Memory based rpc (for speed check and testing)
    */
   extern SVCXPRT *svc_raw_create(void);
   
   /*
    * svc_dg_enable_cache() enables the cache on dg transports.
    */
   int svc_dg_enablecache(SVCXPRT *, const u_int);
   
   int __rpc_get_local_uid(SVCXPRT *_transp, uid_t *_uid);
   
   #endif  /* !_KERNEL */
   
   __END_DECLS
   
   #ifndef _KERNEL
   /* for backward compatibility */
   #include <rpc/svc_soc.h>
   #endif
   
   #endif /* !_RPC_SVC_H */

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