RPC_SVC_CALLS(3)        NetBSD Library Functions Manual       RPC_SVC_CALLS(3)

NAME
     svc_dg_enablecache, svc_exit, svc_fdset, svc_freeargs, svc_getargs,
     svc_getreq_common, svc_getreq_poll, svc_getreqset, svc_getrpccaller,
     svc_pollset, svc_run, svc_sendreply -- library routines for RPC servers

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <rpc/rpc.h>

     int
     svc_dg_enablecache(SVCXPRT *xprt, const unsigned cache_size);

     void
     svc_exit(void);

     bool_t
     svc_freeargs(const SVCXPRT *xprt, const xdrproc_t inproc, caddr_t in);

     bool_t
     svc_getargs(const SVCXPRT *xprt, const xdrproc_t inproc, caddr_t in);

     void
     svc_getreq_common(const int fd);

     void
     svc_getreq_poll(struct pollfd *pfdp, const int pollretval);

     void
     svc_getreqset(fd_set * rdfds);

     struct netbuf *
     svc_getrpccaller(const SVCXPRT *xprt);

     struct sockcred *
     __svc_getcallercreds(const SVCXPRT *xprt);

     struct pollfd svc_pollset[FD_SETSIZE];

     void
     svc_run(void);

     bool_t
     svc_sendreply(const SVCXPRT *xprt, const xdrproc_t outproc,
         const caddr_t *out);

DESCRIPTION
     These routines are part of the RPC library which allows C language pro-
     grams to make procedure calls on other machines across the network.

     These routines are associated with the server side of the RPC mechanism.
     Some of them are called by the server side dispatch function, while oth-
     ers (such as svc_run()) are called when the server is initiated.

ROUTINES
     See rpc(3) for the definition of the SVCXPRT data structure.

     svc_dg_enablecache()    This function allocates a duplicate request cache
                             for the service endpoint xprt, large enough to
                             hold cache_size entries.  Once enabled, there is
                             no way to disable caching.  This routine returns
                             0 if space necessary for a cache of the given
                             size was successfully allocated, and 1 otherwise.

     svc_exit()              This function when called by any of the RPC
                             server procedure or otherwise, causes svc_run()
                             to return.

                             As currently implemented, svc_exit() zeroes the
                             svc_fdset global variable.  If RPC server activ-
                             ity is to be resumed, services must be reregis-
                             tered with the RPC library either through one of
                             the rpc_svc_create() functions, or using
                             xprt_register().  svc_exit() has global scope and
                             ends all RPC server activity.  fd_set svc_fdset A
                             global variable reflecting the RPC server's read
                             file descriptor bit mask; it is suitable as a
                             parameter to the select(2) system call.  This is
                             only of interest if service implementors do not
                             call svc_run(), but rather do their own asynchro-
                             nous event processing.  This variable is read-
                             only (do not pass its address to select(2)!), yet
                             it may change after calls to svc_getreqset() or
                             any creation routines.

     svc_freeargs()          A function macro that frees any data allocated by
                             the RPC/XDR system when it decoded the arguments
                             to a service procedure using svc_getargs().  This
                             routine returns TRUE if the results were success-
                             fully freed, and FALSE otherwise.

     svc_getargs()           A function macro that decodes the arguments of an
                             RPC request associated with the RPC service
                             transport handle xprt.  The parameter in is the
                             address where the arguments will be placed;
                             inproc is the XDR routine used to decode the
                             arguments.  This routine returns TRUE if decoding
                             succeeds, and FALSE otherwise.

     svc_getreq_common()     This routine is called to handle a request on the
                             given file descriptor.

     svc_getreq_poll()       This routine is only of interest if a service
                             implementor does not call svc_run(), but instead
                             implements custom asynchronous event processing.
                             It is called when poll(2) has determined that an
                             RPC request has arrived on some RPC file descrip-
                             tors; pollretval() is the return value from
                             poll(2) and pfdp is the array of pollfd struc-
                             tures on which the poll(2) was done.  It is
                             assumed to be an array large enough to contain
                             the maximal number of descriptors allowed.

     svc_getreqset()         This routine is only of interest if a service
                             implementor does not call svc_run(), but instead
                             implements custom asynchronous event processing.
                             It is called when poll(2) has determined that an
                             RPC request has arrived on some RPC file descrip-
                             tors; rdfds is the resultant read file descriptor
                             bit mask.  The routine returns when all file
                             descriptors associated with the value of rdfds
                             have been serviced.

     svc_getrpccaller()      The approved way of getting the network address
                             of the caller of a procedure associated with the
                             RPC service transport handle xprt.

     __svc_getcallercreds()  Warning: this macro is specific to NetBSD and
                             thus not portable. This macro returns a pointer
                             to a sockcred structure, defined in
                             <sys/socket.h>, identifying the calling client.
                             This only works if the client is calling the
                             server over an AF_LOCAL socket.

     struct pollfd svc_pollset[FD_SETSIZE];
                             svc_pollset is an array of pollfd structures
                             derived from svc_fdset[].  It is suitable as a
                             parameter to the poll(2) system call.  The
                             derivation of svc_pollset from svc_fdset is made
                             in the current implementation in svc_run().  Ser-
                             vice implementors who do not call svc_run() and
                             who wish to use this array must perform this
                             derivation themselves.

     svc_run()               This routine never returns.  It waits for RPC
                             requests to arrive, and calls the appropriate
                             service procedure using svc_getreq_poll() when
                             one arrives.  This procedure is usually waiting
                             for the poll(2) system call to return.

     svc_sendreply()         Called by an RPC service's dispatch routine to
                             send the results of a remote procedure call.  The
                             parameter xprt is the request's associated trans-
                             port handle; outproc is the XDR routine which is
                             used to encode the results; and out is the
                             address of the results.  This routine returns
                             TRUE if it succeeds, FALSE otherwise.

SEE ALSO
     poll(2), rpc(3), rpc_svc_create(3), rpc_svc_err(3), rpc_svc_reg(3)

NetBSD 5.1                        May 3, 1993                       NetBSD 5.1

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