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

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 cmsgcred *
     __svc_getcallercreds(const SVCXPRT *xprt);

     struct pollfd svc_pollset[FD_SETSIZE];

     void
     svc_run(void);

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

DESCRIPTION

     These routines are part of the RPC library which allows C language programs 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 others (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 activity is to be resumed, services must be
                             reregistered with the RPC library either through one of the
                             rpc_svc_create(3) functions, or using xprt_register().  The
                             svc_exit() function 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 an argument to the select(2) system
                             call.  This is only of interest if service implementors do not call
                             svc_run(), but rather do their own asynchronous 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
                             successfully 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 in
                             argument 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 descriptors; pollretval is the
                             return value from poll(2) and pfdp is the array of pollfd structures
                             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 descriptors; 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 FreeBSD and thus not portable.
                             This macro returns a pointer to a cmsgcred 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 an argument to the poll(2) system
                             call.  The derivation of svc_pollset from svc_fdset is made in the
                             current implementation in svc_run().  Service 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 xprt argument is the request's
                             associated transport 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.

AVAILABILITY

     These functions are part of libtirpc.

SEE ALSO

     poll(2), select(2), rpc(3), rpc_svc_create(3), rpc_svc_err(3), rpc_svc_reg(3)