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NAME

rpc_clnt_calls

 
clnt_call

 
clnt_freeres

 
clnt_geterr

 
clnt_perrno

 
clnt_perror

 
clnt_sperrno

 
clnt_sperror

 
rpc_broadcast

 
rpc_broadcast_exp

 
rpc_call

 - library routines for client side calls

 

LIBRARY

Lb libc

 

SYNOPSIS

DESCRIPTION

The clnt_call (,);
rpc_call (,);
and rpc_broadcast ();
routines handle the client side of the procedure call. The remaining routines deal with error handling in the case of errors.

Some of the routines take a Vt CLIENT handle as one of the arguments. A Vt CLIENT handle can be created by an RPC creation routine such as clnt_create ();
(see rpc_clnt_create3).

These routines are safe for use in multithreaded applications. Vt CLIENT handles can be shared between threads, however in this implementation requests by different threads are serialized (that is, the first request will receive its results before the second request is sent).  

Routines

Fn clnt_call

A function macro that calls the remote procedure Fa procnum associated with the client handle, Fa clnt , which is obtained with an RPC client creation routine such as clnt_create ();
(see rpc_clnt_create3). The Fa inproc argument is the XDR function used to encode the procedure's arguments, and Fa outproc is the XDR function used to decode the procedure's results; Fa in is the address of the procedure's argument(s), and Fa out is the address of where to place the result(s). The Fa tout argument is the time allowed for results to be returned, which is overridden by a time-out set explicitly through clnt_control (,);
see rpc_clnt_create3. If the remote call succeeds, the status returned is RPC_SUCCESS otherwise an appropriate status is returned.

Fn clnt_freeres

A function macro that frees any data allocated by the RPC/XDR system when it decoded the results of an RPC call. The Fa out argument is the address of the results, and Fa outproc is the XDR routine describing the results. This routine returns 1 if the results were successfully freed, and 0 otherwise.

Fn clnt_geterr

A function macro that copies the error structure out of the client handle to the structure at address Fa errp .

Fn clnt_perrno

Print a message to standard error corresponding to the condition indicated by Fa stat . A newline is appended. Normally used after a procedure call fails for a routine for which a client handle is not needed, for instance rpc_call (.);

Fn clnt_perror

Print a message to the standard error indicating why an RPC call failed; Fa clnt is the handle used to do the call. The message is prepended with string Fa s and a colon. A newline is appended. Normally used after a remote procedure call fails for a routine which requires a client handle, for instance clnt_call (.);

Fn clnt_sperrno

Take the same arguments as clnt_perrno (,);
but instead of sending a message to the standard error indicating why an RPC call failed, return a pointer to a string which contains the message. The clnt_sperrno ();
function is normally used instead of clnt_perrno ();
when the program does not have a standard error (as a program running as a server quite likely does not), or if the programmer does not want the message to be output with printf ();
(see printf(3)), or if a message format different than that supported by clnt_perrno ();
is to be used. Note: unlike clnt_sperror ();
and clnt_spcreateerror ();
(see rpc_clnt_create3), clnt_sperrno ();
does not return pointer to static data so the result will not get overwritten on each call.

Fn clnt_sperror

Like clnt_perror (,);
except that (like clnt_sperrno ());
it returns a string instead of printing to standard error. However, clnt_sperror ();
does not append a newline at the end of the message. Warning: returns pointer to a buffer that is overwritten on each call.

Fn rpc_broadcast

Like rpc_call (,);
except the call message is broadcast to all the connectionless transports specified by Fa nettype . If Fa nettype is NULL it defaults to Qq netpath . Each time it receives a response, this routine calls eachresult (,);
whose form is: bool_t eachresult (caddr_t out const struct netbuf * addr const struct netconfig * netconf);
where Fa out is the same as Fa out passed to rpc_broadcast (,);
except that the remote procedure's output is decoded there; Fa addr points to the address of the machine that sent the results, and Fa netconf is the netconfig structure of the transport on which the remote server responded. If eachresult ();
returns 0, rpc_broadcast ();
waits for more replies; otherwise it returns with appropriate status. Warning: broadcast file descriptors are limited in size to the maximum transfer size of that transport. For Ethernet, this value is 1500 bytes. The rpc_broadcast ();
function uses AUTH_SYS credentials by default (see rpc_clnt_auth3).

Fn rpc_broadcast_exp

Like rpc_broadcast (,);
except that the initial timeout, Fa inittime and the maximum timeout, Fa waittime are specified in milliseconds. The Fa inittime argument is the initial time that rpc_broadcast_exp ();
waits before resending the request. After the first resend, the re-transmission interval increases exponentially until it exceeds Fa waittime .

Fn rpc_call

Call the remote procedure associated with Fa prognum , Fa versnum , and Fa procnum on the machine, Fa host . The Fa inproc argument is used to encode the procedure's arguments, and Fa outproc is used to decode the procedure's results; Fa in is the address of the procedure's argument(s), and Fa out is the address of where to place the result(s). The Fa nettype argument can be any of the values listed on rpc(3). This routine returns RPC_SUCCESS if it succeeds, or an appropriate status is returned. Use the clnt_perrno ();
routine to translate failure status into error messages. Warning: rpc_call ();
uses the first available transport belonging to the class Fa nettype , on which it can create a connection. You do not have control of timeouts or authentication using this routine.

SEE ALSO

Index

NAME

LIBRARY

SYNOPSIS

DESCRIPTION

Routines

SEE ALSO

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