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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 -- li-
brary 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 proce-
dure 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 en-
abled, 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 activ-
ity.
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 suc-
cessfully freed, and FALSE otherwise.
svc_getargs() A function macro that decodes the arguments of an RPC request asso-
ciated 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 de-
scriptor.
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 re-
sultant read file descriptor bit mask. The routine returns when all
file descriptors associated with the value of rdfds have been ser-
viced.
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 associ-
ated 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)
BSD May 3, 1993 BSD
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