svc_exit(3)



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

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 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 ar-
                             guments.  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 im-
                             plementor 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 im-
                             plementor 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 de-
                             scriptors 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 de-
                             rived from svc_fdset[].  It is suitable as an ar-
                             gument 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 im-
                             plementors 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 re-
                             quests to arrive, and calls the appropriate ser-
                             vice 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 ad-
                             dress 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)

BSD                               May 3, 1993                              BSD

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