f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
443 lines
12 KiB
Groff
443 lines
12 KiB
Groff
.\" @(#)rpc_clnt_create.3n 1.36 93/08/31 SMI; from SVr4
|
|
.\" Copyright 1989 AT&T
|
|
.\" @(#)rpc_clnt_create 1.5 89/07/24 SMI;
|
|
.\" Copyright (c) 1988 Sun Microsystems, Inc. - All Rights Reserved.
|
|
.\" $NetBSD: rpc_clnt_create.3,v 1.12 2011/05/17 03:35:39 enami Exp $
|
|
.Dd May 23, 2009
|
|
.Dt RPC_CLNT_CREATE 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rpc_clnt_create ,
|
|
.Nm clnt_control ,
|
|
.Nm clnt_create ,
|
|
.Nm clnt_create_vers ,
|
|
.Nm clnt_destroy ,
|
|
.Nm clnt_dg_create ,
|
|
.Nm clnt_pcreateerror ,
|
|
.Nm clnt_raw_create ,
|
|
.Nm clnt_spcreateerror ,
|
|
.Nm clnt_tli_create ,
|
|
.Nm clnt_tp_create ,
|
|
.Nm clnt_vc_create ,
|
|
.Nm rpc_createerr
|
|
.Nd "library routines for dealing with creation and manipulation of CLIENT handles"
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In rpc/rpc.h
|
|
.Ft bool_t
|
|
.Fn clnt_control "CLIENT *clnt" "const u_int req" "char *info"
|
|
.Ft "CLIENT *"
|
|
.Fn clnt_create "const char * host" "const rpcprog_t prognum" "const rpcvers_t versnum" "const char *nettype"
|
|
.Ft "CLIENT *"
|
|
.Fn clnt_create_vers "const char * host" "const rpcprog_t prognum" "rpcvers_t *vers_outp" "const rpcvers_t vers_low" "const rpcvers_t vers_high" "char *nettype"
|
|
.Ft void
|
|
.Fn clnt_destroy "CLIENT * clnt"
|
|
.Ft "CLIENT *"
|
|
.Fn clnt_dg_create "const int fildes" "const struct netbuf *svcaddr" "const rpcprog_t prognum" "const rpcvers_t versnum" "const u_int sendsz" "const u_int recvsz"
|
|
.Ft void
|
|
.Fn clnt_pcreateerror "const char *s"
|
|
.Ft "char *"
|
|
.Fn clnt_spcreateerror "const char *s"
|
|
.Ft "CLIENT *"
|
|
.Fn clnt_raw_create "const rpcprog_t prognum" "const rpcvers_t versnum"
|
|
.Ft "CLIENT *"
|
|
.Fn clnt_tli_create "const int fildes" "const struct netconfig *netconf" "const struct netbuf *svcaddr" "const rpcprog_t prognum" "const rpcvers_t versnum" "const u_int sendsz" "const u_int recvsz"
|
|
.Ft "CLIENT *"
|
|
.Fn clnt_tp_create "const char * host" "const rpcprog_t prognum" "const rpcvers_t versnum" "const struct netconfig *netconf"
|
|
.Ft "CLIENT *"
|
|
.Fn clnt_vc_create "const int fildes" "const struct netbuf *svcaddr" "const rpcprog_t prognum" "const rpcvers_t versnum" "const u_int sendsz" "const u_int recvsz"
|
|
.Sh DESCRIPTION
|
|
RPC library routines allow C language programs to make procedure
|
|
calls on other machines across the network.
|
|
First a
|
|
.Dv CLIENT
|
|
handle is created and then the client calls a procedure to send a
|
|
request to the server.
|
|
On receipt of the request, the server calls a dispatch routine
|
|
to perform the requested service, and then sends a reply.
|
|
.Sh ROUTINES
|
|
.Bl -tag -width YYYYYYY
|
|
.It Fn clnt_control
|
|
A function macro to change or retrieve various information
|
|
about a client object.
|
|
.Fa req
|
|
indicates the type of operation, and
|
|
.Fa info
|
|
is a pointer to the information.
|
|
For both connectionless and connection-oriented transports,
|
|
the supported values of
|
|
.Fa req
|
|
and their argument types and what they do are:
|
|
.Bl -column "CLSET_FD_NCLOSE" "struct timeval *" "set total timeout"
|
|
.It Dv CLSET_TIMEOUT Ta "struct timeval *" Ta "set total timeout"
|
|
.It Dv CLGET_TIMEOUT Ta "struct timeval *" Ta "get total timeout"
|
|
.El
|
|
.Pp
|
|
Note:
|
|
if you set the timeout using
|
|
.Fn clnt_control ,
|
|
the timeout argument passed by
|
|
.Fn clnt_call
|
|
is ignored in all subsequent calls.
|
|
.Pp
|
|
Note:
|
|
If you set the timeout value to 0
|
|
.Fn clnt_control
|
|
immediately returns an error
|
|
.Pq Dv RPC_TIMEDOUT .
|
|
Set the timeout parameter to 0 for batching calls.
|
|
.Bl -column CLSET_FD_NCLOSE "struct timeval *" "do not close fd on destroy"
|
|
.It Dv CLGET_SVC_ADDR Ta "struct netbuf *" Ta "get servers address"
|
|
.It Dv CLGET_FD Ta "int *" Ta "get fd from handle"
|
|
.It Dv CLSET_FD_CLOSE Ta "void" Ta "close fd on destroy"
|
|
.It Dv CLSET_FD_NCLOSE Ta void Ta "don't close fd on destroy"
|
|
.It Dv CLGET_VERS Ta "unsigned long *" Ta "get RPC program version"
|
|
.It Dv CLSET_VERS Ta "unsigned long *" Ta "set RPC program version"
|
|
.It Dv CLGET_XID Ta "unsigned long *" Ta "get XID of previous call"
|
|
.It Dv CLSET_XID Ta "unsigned long *" Ta "set XID of next call"
|
|
.El
|
|
.Pp
|
|
The following operations are valid for connectionless transports only:
|
|
.Bl -column CLSET_RETRY_TIMEOUT "struct timeval *" "set total timeout"
|
|
.It Dv CLSET_RETRY_TIMEOUT Ta "struct timeval *" Ta "set the retry timeout"
|
|
.It Dv CLGET_RETRY_TIMEOUT Ta "struct timeval *" Ta "get the retry timeout"
|
|
.El
|
|
.Pp
|
|
The retry timeout is the time that RPC
|
|
waits for the server to reply before retransmitting the request.
|
|
.Fn clnt_control
|
|
returns
|
|
.Dv TRUE
|
|
on success and
|
|
.Dv FALSE
|
|
on failure.
|
|
.Pp
|
|
.It Fn clnt_create
|
|
Generic client creation routine for program
|
|
.Fa prognum
|
|
and version
|
|
.Fa versnum .
|
|
.Fa host
|
|
identifies the name of the remote host where the server
|
|
is located.
|
|
.Fa nettype
|
|
indicates the class of transport protocol to use.
|
|
The transports are tried in left to right order in
|
|
.Ev NETPATH
|
|
environment variable or in top to bottom order in
|
|
the netconfig database.
|
|
.Fn clnt_create
|
|
tries all the transports of the
|
|
.Fa nettype
|
|
class available from the
|
|
.Ev NETPATH
|
|
environment variable and the netconfig database,
|
|
and chooses the first successful one.
|
|
A default timeout is set and can be modified using
|
|
.Fn clnt_control .
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
The
|
|
.Fn clnt_pcreateerror
|
|
routine can be used to print the reason for failure.
|
|
.Pp
|
|
Note:
|
|
.Fn clnt_create
|
|
returns a valid client handle even
|
|
if the particular version number supplied to
|
|
.Fn clnt_create
|
|
is not registered with the
|
|
.Xr rpcbind 8
|
|
service.
|
|
This mismatch will be discovered by a
|
|
.Fn clnt_call
|
|
later (see
|
|
.Xr rpc_clnt_calls 3 ) .
|
|
.Pp
|
|
.It Fn clnt_create_vers
|
|
Generic client creation routine which is similar to
|
|
.Fn clnt_create
|
|
but which also checks for the
|
|
version availability.
|
|
.Fa host
|
|
identifies the name of the remote host where the server
|
|
is located.
|
|
.Fa nettype
|
|
indicates the class transport protocols to be used.
|
|
If the routine is successful it returns a client handle created for
|
|
the highest version between
|
|
.Fa vers_low
|
|
and
|
|
.Fa vers_high
|
|
that is supported by the server.
|
|
.Fa vers_outp
|
|
is set to this value.
|
|
That is, after a successful return
|
|
.Fa vers_low
|
|
\*[Le]
|
|
.Fa *vers_outp
|
|
\*[Le]
|
|
.Fa vers_high .
|
|
If no version between
|
|
.Fa vers_low
|
|
and
|
|
.Fa vers_high
|
|
is supported by the server then the routine fails and returns
|
|
.Dv NULL .
|
|
A default timeout is set and can be modified using
|
|
.Fn clnt_control .
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
The
|
|
.Fn clnt_pcreateerror
|
|
routine can be used to print the reason for failure.
|
|
Note:
|
|
.Fn clnt_create
|
|
returns a valid client handle even
|
|
if the particular version number supplied to
|
|
.Fn clnt_create
|
|
is not registered with the
|
|
.Xr rpcbind 8
|
|
service.
|
|
This mismatch will be discovered by a
|
|
.Fn clnt_call
|
|
later (see
|
|
.Xr rpc_clnt_calls 3 ) .
|
|
However,
|
|
.Fn clnt_create_vers
|
|
does this for you and returns a valid handle
|
|
only if a version within
|
|
the range supplied is supported by the server.
|
|
.Pp
|
|
.It Fn clnt_destroy
|
|
A function macro that destroys the client's RPC handle.
|
|
Destruction usually involves deallocation
|
|
of private data structures, including
|
|
.Fa clnt
|
|
itself.
|
|
Use of
|
|
.Fa clnt
|
|
is undefined after calling
|
|
.Fn clnt_destroy .
|
|
If the RPC library opened the associated file descriptor, or
|
|
.Dv CLSET_FD_CLOSE
|
|
was set using
|
|
.Fn clnt_control ,
|
|
the file descriptor will be closed.
|
|
The caller should call
|
|
.Fn auth_destroy "clnt-\*[Gt]cl_auth"
|
|
(before calling
|
|
.Fn clnt_destroy )
|
|
to destroy the associated
|
|
.Dv AUTH
|
|
structure (see
|
|
.Xr rpc_clnt_auth 3 ) .
|
|
.Pp
|
|
.It Fn clnt_dg_create
|
|
This routine creates an RPC client for the remote program
|
|
.Fa prognum
|
|
and version
|
|
.Fa versnum ;
|
|
the client uses a connectionless transport.
|
|
The remote program is located at address
|
|
.Fa svcaddr .
|
|
The parameter
|
|
.Fa fildes
|
|
is an open and bound file descriptor.
|
|
This routine will resend the call message in intervals of
|
|
15 seconds until a response is received or until the
|
|
call times out.
|
|
The total time for the call to time out is specified by
|
|
.Fn clnt_call
|
|
(see
|
|
.Fn clnt_call
|
|
in
|
|
.Xr rpc_clnt_calls 3 ) .
|
|
The retry time out and the total time out periods can
|
|
be changed using
|
|
.Fn clnt_control .
|
|
The user may set the size of the send and receive
|
|
buffers with the parameters
|
|
.Fa sendsz
|
|
and
|
|
.Fa recvsz ;
|
|
values of 0 choose suitable defaults.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
.Pp
|
|
.It Fn clnt_pcreateerror
|
|
Print a message to standard error indicating
|
|
why a client RPC handle could not be created.
|
|
The message is prepended with the string
|
|
.Fa s
|
|
and a colon, and appended with a newline.
|
|
.Pp
|
|
.It Fn clnt_spcreateerror
|
|
Like
|
|
.Fn clnt_pcreateerror ,
|
|
except that it returns a string
|
|
instead of printing to the standard error.
|
|
A newline is not appended to the message in this case.
|
|
Warning:
|
|
returns a pointer to a buffer that is overwritten
|
|
on each call.
|
|
.Pp
|
|
.It Fn clnt_raw_create
|
|
This routine creates an RPC
|
|
client handle for the remote program
|
|
.Fa prognum
|
|
and version
|
|
.Fa versnum .
|
|
The transport used to pass messages to the service is
|
|
a buffer within the process's address space,
|
|
so the corresponding RPC
|
|
server should live in the same address space;
|
|
(see
|
|
.Fn svc_raw_create
|
|
in
|
|
.Xr rpc_svc_create 3 ) .
|
|
This allows simulation of RPC and measurement of
|
|
RPC overheads, such as round trip times,
|
|
without any kernel or networking interference.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
.Fn clnt_raw_create
|
|
should be called after
|
|
.Fn svc_raw_create .
|
|
.Pp
|
|
.It Fn clnt_tli_create
|
|
This routine creates an RPC
|
|
client handle for the remote program
|
|
.Fa prognum
|
|
and version
|
|
.Fa versnum .
|
|
The remote program is located at address
|
|
.Fa svcaddr .
|
|
If
|
|
.Fa svcaddr
|
|
is
|
|
.Dv NULL
|
|
and it is connection-oriented, it is assumed that the file descriptor
|
|
is connected.
|
|
For connectionless transports, if
|
|
.Fa svcaddr
|
|
is
|
|
.Dv NULL ,
|
|
.Dv RPC_UNKNOWNADDR
|
|
error is set.
|
|
.Fa fildes
|
|
is a file descriptor which may be open, bound and connected.
|
|
If it is
|
|
.Dv RPC_ANYFD ,
|
|
it opens a file descriptor on the transport specified by
|
|
.Fa netconf .
|
|
If
|
|
.Fa fildes
|
|
is
|
|
.Dv RPC_ANYFD
|
|
and
|
|
.Fa netconf
|
|
is
|
|
.Dv NULL ,
|
|
a
|
|
.Dv RPC_UNKNOWNPROTO
|
|
error is set.
|
|
If
|
|
.Fa fildes
|
|
is unbound, then it will attempt to bind the descriptor.
|
|
The user may specify the size of the buffers with the parameters
|
|
.Fa sendsz
|
|
and
|
|
.Fa recvsz ;
|
|
values of 0 choose suitable defaults.
|
|
Depending upon the type of the transport (connection-oriented
|
|
or connectionless),
|
|
.Fn clnt_tli_create
|
|
calls appropriate client creation routines.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
The
|
|
.Fn clnt_pcreateerror
|
|
routine can be used to print the reason for failure.
|
|
The remote rpcbind
|
|
service (see
|
|
.Xr rpcbind 8 )
|
|
is not consulted for the address of the remote
|
|
service.
|
|
.Pp
|
|
.It Fn clnt_tp_create
|
|
Like
|
|
.Fn clnt_create
|
|
except
|
|
.Fn clnt_tp_create
|
|
tries only one transport specified through
|
|
.Fa netconf .
|
|
.Fn clnt_tp_create
|
|
creates a client handle for the program
|
|
.Fa prognum ,
|
|
the version
|
|
.Fa versnum ,
|
|
and for the transport specified by
|
|
.Fa netconf .
|
|
Default options are set,
|
|
which can be changed using
|
|
.Fn clnt_control
|
|
calls.
|
|
The remote rpcbind service on the host
|
|
.Fa host
|
|
is consulted for the address of the remote service.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
The
|
|
.Fn clnt_pcreateerror
|
|
routine can be used to print the reason for failure.
|
|
.Pp
|
|
.It Fn clnt_vc_create
|
|
This routine creates an RPC
|
|
client for the remote program
|
|
.Fa prognum
|
|
and version
|
|
.Fa versnum ;
|
|
the client uses a connection-oriented transport.
|
|
The remote program is located at address
|
|
.Fa svcaddr .
|
|
The parameter
|
|
.Fa fildes
|
|
is an open and bound file descriptor.
|
|
The user may specify the size of the send and receive buffers
|
|
with the parameters
|
|
.Fa sendsz
|
|
and
|
|
.Fa recvsz ;
|
|
values of 0 choose suitable defaults.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
The address
|
|
.Fa svcaddr
|
|
should not be
|
|
.Dv NULL
|
|
and should point to the actual address of the remote program.
|
|
.Fn clnt_vc_create
|
|
does not consult the remote rpcbind service for this information.
|
|
.Pp
|
|
.It struct rpc_createerr rpc_createerr;
|
|
A global variable whose value is set by any RPC
|
|
client handle creation routine
|
|
that fails.
|
|
It is used by the routine
|
|
.Fn clnt_pcreateerror
|
|
to print the reason for the failure.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr rpc 3 ,
|
|
.Xr rpc_clnt_auth 3 ,
|
|
.Xr rpc_clnt_calls 3 ,
|
|
.Xr rpcbind 8
|