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Man Pages


Manual Reference Pages  -  CLNT_TLI_CREATE (3)

NAME

rpc_clnt_create, clnt_control, clnt_create, clnt_create_timed, clnt_create_vers, clnt_create_vers_timed, clnt_destroy, clnt_dg_create, clnt_pcreateerror, clnt_raw_create, clnt_spcreateerror, clnt_tli_create, clnt_tp_create, clnt_tp_create_timed, clnt_vc_create, rpc_createerr - library routines for dealing with creation and manipulation of
.Vt CLIENT handles

CONTENTS

Library
Synopsis
Description
Routines
See Also

LIBRARY


.Lb libc

SYNOPSIS


.In rpc/rpc.h bool_t clnt_control CLIENT *clnt const u_int req char *info CLIENT * clnt_create const char * host const rpcprog_t prognum const rpcvers_t versnum const char *nettype CLIENT * clnt_create_timed const char * host const rpcprog_t prognum const rpcvers_t versnum const char *nettype const struct timeval *timeout CLIENT * clnt_create_vers const char * host const rpcprog_t prognum rpcvers_t *vers_outp const rpcvers_t vers_low const rpcvers_t vers_high const char *nettype CLIENT * clnt_create_vers_timed const char * host const rpcprog_t prognum rpcvers_t *vers_outp const rpcvers_t vers_low const rpcvers_t vers_high const char *nettype const struct timeval *timeout void clnt_destroy CLIENT *clnt CLIENT * 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 void clnt_pcreateerror const char *s char * clnt_spcreateerror const char *s CLIENT * clnt_raw_create const rpcprog_t prognum const rpcvers_t versnum CLIENT * clnt_tli_create const int fildes const struct netconfig *netconf struct netbuf *svcaddr const rpcprog_t prognum const rpcvers_t versnum const u_int sendsz const u_int recvsz CLIENT * clnt_tp_create const char * host const rpcprog_t prognum const rpcvers_t versnum const struct netconfig *netconf CLIENT * clnt_tp_create_timed const char * host const rpcprog_t prognum const rpcvers_t versnum const struct netconfig *netconf const struct timeval *timeout CLIENT * clnt_vc_create const int fildes const struct netbuf *svcaddr const rpcprog_t prognum const rpcvers_t versnum u_int sendsz u_int recvsz

DESCRIPTION

RPC library routines allow C language programs to make procedure calls on other machines across the network. First a
.Vt 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.

Routines

clnt_control
  A function macro to change or retrieve various information about a client object. The req argument indicates the type of operation, and info is a pointer to the information. For both connectionless and connection-oriented transports, the supported values of req and their argument types and what they do are:
CLSET_TIMEOUT      struct timeval *      set total timeout
CLGET_TIMEOUT      struct timeval *      get total timeout
 

Note: if you set the timeout using clnt_control, the timeout argument passed by clnt_call is ignored in all subsequent calls.

Note: If you set the timeout value to 0, clnt_control immediately returns an error (RPC_TIMEDOUT). Set the timeout argument to 0 for batching calls.
CLGET_SVC_ADDR      struct netbuf *      get servers address
CLGET_FD      int *      get fd from handle
CLSET_FD_CLOSE      void      close fd on destroy
CLSET_FD_NCLOSE      void      do not close fd on destroy
CLGET_VERS      uint32_t *      get RPC program version
CLSET_VERS      uint32_t *      set RPC program version
CLGET_XID      uint32_t *      get XID of previous call
CLSET_XID      uint32_t *      set XID of next call
 

The following operations are valid for connectionless transports only:
CLSET_RETRY_TIMEOUT      struct timeval *      set the retry timeout
CLGET_RETRY_TIMEOUT      struct timeval *      get the retry timeout
CLSET_CONNECT      Vt int *      use connect(2)
 

The retry timeout is the time that RPC waits for the server to reply before retransmitting the request. The clnt_control function returns TRUE on success and FALSE on failure.
clnt_create Generic client creation routine for program prognum and version versnum. The host argument identifies the name of the remote host where the server is located. The nettype argument indicates the class of transport protocol to use. The transports are tried in left to right order in NETPATH environment variable or in top to bottom order in the netconfig database. The clnt_create function tries all the transports of the nettype class available from the NETPATH environment variable and the netconfig database, and chooses the first successful one. A default timeout is set and can be modified using clnt_control. This routine returns NULL if it fails. The clnt_pcreateerror routine can be used to print the reason for failure.

Note: clnt_create returns a valid client handle even if the particular version number supplied to clnt_create is not registered with the rpcbind(8) service. This mismatch will be discovered by a clnt_call later (see rpc_clnt_calls(3)).

clnt_create_timed Generic client creation routine which is similar to clnt_create but which also has the additional argument timeout that specifies the maximum amount of time allowed for each transport class tried. In all other respects, the clnt_create_timed call behaves exactly like the clnt_create call.
clnt_create_vers Generic client creation routine which is similar to clnt_create but which also checks for the version availability. The host argument identifies the name of the remote host where the server is located. The nettype argument indicates the class transport protocols to be used. If the routine is successful it returns a client handle created for the highest version between vers_low and vers_high that is supported by the server. The vers_outp argument is set to this value. That is, after a successful return vers_low <= *vers_outp <= vers_high. If no version between vers_low and vers_high is supported by the server then the routine fails and returns NULL. A default timeout is set and can be modified using clnt_control. This routine returns NULL if it fails. The clnt_pcreateerror routine can be used to print the reason for failure. Note: clnt_create returns a valid client handle even if the particular version number supplied to clnt_create is not registered with the rpcbind(8) service. This mismatch will be discovered by a clnt_call later (see rpc_clnt_calls(3)). However, 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.
clnt_create_vers_timed Generic client creation routine which is similar to clnt_create_vers but which also has the additional argument timeout that specifies the maximum amount of time allowed for each transport class tried. In all other respects, the clnt_create_vers_timed call behaves exactly like the clnt_create_vers call.
clnt_destroy A function macro that destroys the client’s RPC handle. Destruction usually involves deallocation of private data structures, including clnt itself. Use of clnt is undefined after calling clnt_destroy. If the RPC library opened the associated file descriptor, or CLSET_FD_CLOSE was set using clnt_control, the file descriptor will be closed. The caller should call auth_destroy clnt->cl_auth (before calling clnt_destroy) to destroy the associated
.Vt AUTH structure (see rpc_clnt_auth(3)).
clnt_dg_create This routine creates an RPC client for the remote program prognum and version versnum; the client uses a connectionless transport. The remote program is located at address svcaddr. The fildes argument 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 clnt_call (see clnt_call in rpc_clnt_calls(3)). The retry time out and the total time out periods can be changed using clnt_control. The user may set the size of the send and receive buffers with the sendsz and recvsz arguments; values of 0 choose suitable defaults. This routine returns NULL if it fails.
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 s and a colon, and appended with a newline.
clnt_spcreateerror Like 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.
clnt_raw_create This routine creates an RPC client handle for the remote program prognum and version 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 svc_raw_create in 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 NULL if it fails. The clnt_raw_create function should be called after svc_raw_create.
clnt_tli_create This routine creates an RPC client handle for the remote program prognum and version versnum. The remote program is located at address svcaddr. If svcaddr is NULL and it is connection-oriented, it is assumed that the file descriptor is connected. For connectionless transports, if svcaddr is NULL, RPC_UNKNOWNADDR error is set. The fildes argument is a file descriptor which may be open, bound and connected. If it is RPC_ANYFD, it opens a file descriptor on the transport specified by netconf. If fildes is RPC_ANYFD and netconf is NULL, a RPC_UNKNOWNPROTO error is set. If fildes is unbound, then it will attempt to bind the descriptor. The user may specify the size of the buffers with the sendsz and recvsz arguments; values of 0 choose suitable defaults. Depending upon the type of the transport (connection-oriented or connectionless), clnt_tli_create calls appropriate client creation routines. This routine returns NULL if it fails. The clnt_pcreateerror routine can be used to print the reason for failure. The remote rpcbind service (see rpcbind(8)) is not consulted for the address of the remote service.
clnt_tp_create Like clnt_create except clnt_tp_create tries only one transport specified through netconf. The clnt_tp_create function creates a client handle for the program prognum, the version versnum, and for the transport specified by netconf. Default options are set, which can be changed using clnt_control calls. The remote rpcbind service on the host host is consulted for the address of the remote service. This routine returns NULL if it fails. The clnt_pcreateerror routine can be used to print the reason for failure.
clnt_tp_create_timed Like clnt_tp_create except clnt_tp_create_timed has the extra argument timeout which specifies the maximum time allowed for the creation attempt to succeed. In all other respects, the clnt_tp_create_timed call behaves exactly like the clnt_tp_create call.
clnt_vc_create This routine creates an RPC client for the remote program prognum and version versnum; the client uses a connection-oriented transport. The remote program is located at address svcaddr. The fildes argument is an open and bound file descriptor. The user may specify the size of the send and receive buffers with the sendsz and recvsz arguments; values of 0 choose suitable defaults. This routine returns NULL if it fails. The address svcaddr should not be NULL and should point to the actual address of the remote program. The clnt_vc_create function does not consult the remote rpcbind service for this information.

.Vt struct rpc_createerr Va rpc_createerr ;
  A global variable whose value is set by any RPC client handle creation routine that fails. It is used by the routine clnt_pcreateerror to print the reason for the failure.

SEE ALSO

rpc(3), rpc_clnt_auth(3), rpc_clnt_calls(3), rpcbind(8)
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