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RPC_SVC_CREATE(3) DragonFly Library Functions Manual RPC_SVC_CREATE(3)
NAME
rpc_svc_create, svc_create, svc_destroy, svc_dg_create, svc_fd_create,
svc_raw_create, svc_tli_create, svc_tp_create, svc_vc_create -- library
routines for the creation of server handles
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <rpc/rpc.h>
int
svc_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
const rpcprog_t prognum, const rpcvers_t versnum,
const char *nettype);
SVCXPRT *
svc_dg_create(const int fildes, const u_int sendsz, const u_int recvsz);
void
svc_destroy(SVCXPRT *xprt);
SVCXPRT *
svc_fd_create(const int fildes, const u_int sendsz, const u_int recvsz);
SVCXPRT *
svc_raw_create(void);
SVCXPRT *
svc_tli_create(const int fildes, const struct netconfig *netconf,
const struct t_bind *bindaddr, const u_int sendsz,
const u_int recvsz);
SVCXPRT *
svc_tp_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
const rpcprog_t prognum, const rpcvers_t versnum,
const struct netconfig *netconf);
SVCXPRT *
svc_vc_create(const int fildes, const u_int sendsz, const u_int recvsz);
DESCRIPTION
These routines are part of the RPC library which allows C language pro-
grams to make procedure calls on servers across the network. These rou-
tines deal with the creation of service handles. Once the handle is cre-
ated, the server can be invoked by calling svc_run().
Routines
See rpc(3) for the definition of the SVCXPRT data structure.
svc_create()
The svc_create() function creates server handles for all the
transports belonging to the class nettype. The nettype argument
defines a class of transports which can be used for a particular
application. The transports are tried in left to right order in
NETPATH variable or in top to bottom order in the netconfig data-
base. If nettype is NULL, it defaults to "netpath".
The svc_create() function registers itself with the rpcbind ser-
vice (see rpcbind(8)). The dispatch function is called when there
is a remote procedure call for the given prognum and versnum; this
requires calling svc_run() (see svc_run() in rpc_svc_reg(3)). If
svc_create() succeeds, it returns the number of server handles it
created, otherwise it returns 0 and an error message is logged.
svc_destroy()
A function macro that destroys the RPC service handle xprt.
Destruction usually involves deallocation of private data struc-
tures, including xprt itself. Use of xprt is undefined after
calling this routine.
svc_dg_create()
This routine creates a connectionless RPC service handle, and
returns a pointer to it. This routine returns NULL if it fails,
and an error message is logged. The sendsz and recvsz arguments
are arguments used to specify the size of the buffers. If they
are 0, suitable defaults are chosen. The file descriptor fildes
should be open and bound. The server is not registered with
rpcbind(8).
Warning: since connectionless-based RPC messages can only hold
limited amount of encoded data, this transport cannot be used for
procedures that take large arguments or return huge results.
svc_fd_create()
This routine creates a service on top of an open and bound file
descriptor, and returns the handle to it. Typically, this
descriptor is a connected file descriptor for a connection-ori-
ented transport. The sendsz and recvsz arguments indicate sizes
for the send and receive buffers. If they are 0, reasonable
defaults are chosen. This routine returns NULL if it fails, and
an error message is logged.
svc_raw_create()
This routine creates an RPC service handle and returns a pointer
to it. The transport is really a buffer within the process's
address space, so the corresponding RPC client should live in the
same address space; (see clnt_raw_create() in rpc_clnt_create(3)).
This routine allows simulation of RPC and acquisition of RPC over-
heads (such as round trip times), without any kernel and network-
ing interference. This routine returns NULL if it fails, and an
error message is logged.
Note: svc_run() should not be called when the raw interface is
being used.
svc_tli_create()
This routine creates an RPC server handle, and returns a pointer
to it. The fildes argument is the file descriptor on which the
service is listening. If fildes is RPC_ANYFD, it opens a file
descriptor on the transport specified by netconf. If the file
descriptor is unbound and bindaddr is not NULL, fildes is bound to
the address specified by bindaddr, otherwise fildes is bound to a
default address chosen by the transport.
Note: the t_bind structure comes from the TLI/XTI SysV interface,
which NetBSD does not use. The structure is defined in
<rpc/types.h> for compatibility as:
struct t_bind {
struct netbuf addr; /* network address, see rpc(3) */
unsigned int qlen; /* queue length (for listen(2)) */
};
In the case where the default address is chosen, the number of
outstanding connect requests is set to 8 for connection-oriented
transports. The user may specify the size of the send and receive
buffers with the arguments sendsz and recvsz; values of 0 choose
suitable defaults. This routine returns NULL if it fails, and an
error message is logged. The server is not registered with the
rpcbind(8) service.
svc_tp_create()
The svc_tp_create() function creates a server handle for the net-
work specified by netconf, and registers itself with the rpcbind
service. The dispatch function is called when there is a remote
procedure call for the given prognum and versnum; this requires
calling svc_run(). The svc_tp_create() function returns the ser-
vice handle if it succeeds, otherwise a NULL is returned and an
error message is logged.
svc_vc_create()
This routine creates a connection-oriented RPC service and returns
a pointer to it. This routine returns NULL if it fails, and an
error message is logged. The users may specify the size of the
send and receive buffers with the arguments sendsz and recvsz;
values of 0 choose suitable defaults. The file descriptor fildes
should be open and bound. The server is not registered with the
rpcbind(8) service.
SEE ALSO
rpc(3), rpc_svc_calls(3), rpc_svc_err(3), rpc_svc_reg(3), rpcbind(8)
DragonFly 3.5 May 3, 1993 DragonFly 3.5