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RPC_SVC_CALLS(3)	 BSD 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 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, void *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(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 asyn‐
			     chronous 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 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 descrip‐
			     tors; 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 num‐
			     ber 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 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 deriva‐
			     tion 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 deriva‐
			     tion 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 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), select(2), rpc(3), rpc_svc_create(3), rpc_svc_err(3),
     rpc_svc_reg(3)

BSD				  May 3, 1993				   BSD
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