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Networking Services Library Functionsrpc(3NSL)


NAME

 rpc - library routines for remote procedure calls

SYNOPSIS

 
cc [ flag ... ] file ... -lnsl [ library ... ]
#include <rpc/rpc.h>
#include <netconfig.h>

DESCRIPTION

 

These routines allow C language programs to make procedure calls on other machines across a network. First, the client sends a request to the server. On receipt of the request, the server calls a dispatch routine to perform the requested service, and then sends back a reply.

All RPC routines require the header <rpc/rpc.h>. Routines that take a netconfig structure also require that <netconfig.h> be included. Applications using RPC and XDR routines should be linked with the libnsl library.

Multithread Considerations

 

In the case of multithreaded applications, the -mt option must be specified on the command line at compilation time to enable a thread-specific version of rpc_createerr(). See rpc_clnt_create(3NSL) and threads(3THR).

When used in multithreaded applications, client-side routines are MT-Safe. 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). See rpc_clnt_create(3NSL).

When used in multithreaded applications, server-side routines are usually Unsafe. In this implementation the service transport handle, SVCXPRT contains a single data area for decoding arguments and encoding results. See rpc_svc_create(3NSL). Therefore, this structure cannot be freely shared between threads that call functions that do this. Routines that are affected by this restriction are marked as unsafe for MT applications. See rpc_svc_calls(3NSL).

Nettyp

 

Some of the high-level RPC interface routines take a nettype string as one of the parameters (for example, clnt_create(), svc_create(), rpc_reg(), rpc_call()). This string defines a class of transports which can be used for a particular application.

nettype can be one of the following:

netpath
Choose from the transports which have been indicated by their token names in the NETPATH environment variable. If NETPATH is unset or NULL, it defaults to visible. netpath is the default nettype.
visible
Choose the transports which have the visible flag (v) set in the /etc/netconfig file.
circuit_v
This is same as visible except that it chooses only the connection oriented transports (semantics tpi_cots or tpi_cots_ord) from the entries in the /etc/netconfig file.
datagram_v
This is same as visible except that it chooses only the connectionless datagram transports (semantics tpi_clts) from the entries in the /etc/netconfig file.
circuit_n
This is same as netpath except that it chooses only the connection oriented datagram transports (semantics tpi_cots or tpi_cots_ord).
datagram_n
This is same as netpath except that it chooses only the connectionless datagram transports (semantics tpi_clts).
udp
This refers to Internet UDP.
tcp
This refers to Internet TCP.

If nettype is NULL, it defaults to netpath. The transports are tried in left to right order in the NETPATH variable or in top to down order in the /etc/netconfig file.

Derived Types

 

In a 64-bit environment, the derived types are defined as follows:

typedefuint32_trpcprog_t;
typedefuint32_trpcvers_t;
typedefuint32_trpcproc_t;
typedefuint32_trpcprot_t;
typedefuint32_trpcport_t;
typedefint32_trpc_inline_t;

In a 32-bit environment, the derived types are defined as follows:

typedefunsigned longrpcprog_t;
typedefunsigned longrpcvers_t;
typedefunsigned longrpcproc_t;
typedefunsigned longrpcprot_t;
typedefunsigned longrpcport_t;
typedeflongrpc_inline_t;

Data Structures

 

Some of the data structures used by the RPC package are shown below.

The AUTH Structure

 
 
union  des_block  {
        struct  {
        u_int32  high;
        u_int32  low;
        }  key;
char  c[8];
};
typedef  union  des_block  des_block;
extern  bool_t  xdr_des_block();
/*
 *  Authentication  info.  Opaque  to  client.
*/
struct  opaque_auth  {
        enum_t oa_flavor;       /* flavor of auth */
        caddr_t oa_base;        /* address of more auth stuff */
        uint_t oa_length;       /* not to exceed MAX_AUTH_BYTES */
};
/*
 * Auth handle, interface to client side  authenticators.
*/
 typedef  struct  {
        struct opaque_auth ah_cred;
        struct opaque_auth ah_verf;
        union  des_block ah_key;
        struct  auth_ops  {
                void(*ah_nextverf)();
                int(*ah_marshal)();     /* nextverf & serialize */
                int(*ah_validate)();    /* validate verifier */
                int(*ah_refresh)();     /* refresh credentials */
                void(*ah_destroy)();    /* destroy this structure */
        }  *ah_ops;
        caddr_t  ah_private;
}  AUTH;

The CLIENT Structure

 
 
/*
 *  Client  rpc  handle.
 *  Created  by  individual  implementations.
 * Client is responsible for initializing auth.
 */
        typedef  struct  {
        AUTH    *cl_auth;       /* authenticator */
        struct clnt_ops {
              enum clnt_stat (*cl_call)();      /* call remote procedure */
              void (*cl_abort)();               /* abort a call */
              void (*cl_geterr)();           /* get specific error code */
              bool_t (*cl_freeres)();           /* frees results */
              void (*cl_destroy)();           /* destroy this structure */
              bool_t (*cl_control)();           /* the ioctl() of rpc */
              int (*cl_settimers)();            /* set rpc level timers */
             } *cl_ops;
             caddr_t    cl_private;                     /* private stuff */
             char       *cl_netid;                /* network identifier */
             char       *cl_tp;                         /* device name */
}  CLIENT;

The SVCXPRT Structure

 
 
enum  xprt_stat  {
XPRT_DIED,
XPRT_MOREREQS,
XPRT_IDLE
};
/*
 *  Server  side  transport  handle
 */
typedef  struct  {
        int     xp_fd;                  /* file descriptor for the
        ushort_t xp_port;                /* obsolete */
        struct xp_ops {
           bool_t (*xp_recv)(); /* receive incoming requests */
           enum xprt_stat (*xp_stat)(); /* get transport status */
           bool_t (*xp_getargs)();      /* get arguments */
           bool_t (*xp_reply)();        /* send reply */
           bool_t (*xp_freeargs)();     /* free mem allocated
                                                    for args */
           void (*xp_destroy)();        /* destroy this struct */
        } *xp_ops;
        int xp_addrlen;                 /* length of remote addr.
                                        Obsolete */
        char *xp_tp;                    /* transport provider device
                                        name */
        char *xp_netid;                 /* network identifier */
        struct netbuf xp_ltaddr;        /* local transport address */
        struct netbuf xp_rtaddr;        /* remote transport address */
        char xp_raddr[16];              /* remote address. Obsolete */
        struct opaque_auth xp_verf;     /* raw response verifier */
        caddr_t xp_p1;                  /* private: for use
                                        by svc ops */
        caddr_t xp_p2;                  /* private: for use
                                        by svc ops */
        caddr_t xp_p3;                  /* private: for use
                                        by svc lib */
        int xp_type                     /* transport type */
}  SVCXPRT;

The svc_reg Structure

 
 
struct  svc_req  {
   rpcprog_t rq_prog;          /* service program number */
   rpcvers_t rq_vers;          /* service protocol version */
   rpcproc_t rq_proc;          /* the desired procedure */
   struct opaque_auth rq_cred; /* raw creds from the wire */
   caddr_t rq_clntcred;        /* read only cooked cred */
   SVCXPRT *rq_xprt;           /* associated transport */

};

The XDR Structure

 
 
/*
 * XDR operations.
 * XDR_ENCODE causes the type to be encoded into the stream.
 * XDR_DECODE causes the type to be extracted from the stream.
 * XDR_FREE can be used to release the space allocated by an XDR_DECODE
 * request.
 */
enum xdr_op {
    XDR_ENCODE=0,
    XDR_DECODE=1,
    XDR_FREE=2
};
/*
 * This is the number of bytes per unit of external data.
 */
#define BYTES_PER_XDR_UNIT	(4)
#define RNDUP(x)  ((((x) + BYTES_PER_XDR_UNIT - 1) /
                   BYTES_PER_XDR_UNIT) \ * BYTES_PER_XDR_UNIT)
/*
 * A xdrproc_t exists for each data type which is to be encoded or
 * decoded.  The second argument to the xdrproc_t is a pointer to
 * an opaque pointer.  The opaque pointer generally points to a
 * structure of the data type to be decoded.  If this points to 0,
 * then the type routines should allocate dynamic storage of the
 * appropriate size and return it.
 * bool_t  (*xdrproc_t)(XDR *, caddr_t *);
 */
typedef  bool_t (*xdrproc_t)();
/*
 * The XDR handle.
 * Contains operation which is being applied to the stream,
 * an operations vector for the particular implementation
 */
typedef struct {

enum xdr_op x_op;    /* operation; fast additional param */
struct  xdr_ops  {

bool_t       (*x_getlong)();      /* get long from underlying stream */ 
bool_t       (*x_putlong)();      /* put long to underlying stream */ 
bool_t       (*x_getbytes)();      /* get bytes from underlying stream */ 
bool_t       (*x_putbytes)();     /* put bytes to underlying stream */ 
uint_t       (*x_getpostn)();     /* returns bytes off from beginning */ 
bool_t       (*x_setpostn)();     /* reposition the stream */ 
rpc_inline_t *(*x_inline)();      /* buf quick ptr to buffered data */ 
void         (*x_destroy)();      /* free privates of this xdr_stream */ 
bool_t       (*x_control)();      /* changed/retrieve client object info*/ 
bool_t       (*x_getint32)();     /* get int from underlying stream */ 
bool_t       (*x_putint32)();     /* put int to underlying stream */ 

} *x_ops; 

caddr_t      x_public;             /* users' data */ 
caddr_t      x_priv                /* pointer to private data */ 
caddr_t      x_base;               /* private used for position info */ 
int          x_handy;              /* extra private word */  
XDR;

Index to Routines

 

The following table lists RPC routines and the manual reference pages on which they are described:

RPC Routine
Manual Reference Page
auth_destroy
rpc_clnt_auth(3NSL)
authdes_create
rpc_soc(3NSL)
authdes_getucred
secure_rpc(3NSL)
authdes_seccreate
secure_rpc(3NSL)
authnone_create
rpc_clnt_auth(3NSL)
authsys_create
rpc_clnt_auth(3NSL)
authsys_create_default
rpc_clnt_auth(3NSL)
authunix_create
rpc_soc(3NSL)
authunix_create_default
rpc_soc(3NSL)
callrpc
rpc_soc(3NSL)
clnt_broadcast
rpc_soc(3NSL)
clnt_call
rpc_clnt_calls(3NSL)
clnt_control
rpc_clnt_create(3NSL)
clnt_create
rpc_clnt_create(3NSL)
clnt_destroy
rpc_clnt_create(3NSL)
clnt_dg_create
rpc_clnt_create(3NSL)
clnt_freeres
rpc_clnt_calls(3NSL)
clnt_geterr
rpc_clnt_calls(3NSL)
clnt_pcreateerror
rpc_clnt_create(3NSL)
clnt_perrno
rpc_clnt_calls(3NSL)
clnt_perror
rpc_clnt_calls(3NSL)
clnt_raw_create
rpc_clnt_create(3NSL)
clnt_spcreateerror
rpc_clnt_create(3NSL)
clnt_sperrno
rpc_clnt_calls(3NSL)
clnt_sperror
rpc_clnt_calls(3NSL)
clnt_tli_create
rpc_clnt_create(3NSL)
clnt_tp_create
rpc_clnt_create(3NSL)
clnt_udpcreate
rpc_soc(3NSL)
clnt_vc_create
rpc_clnt_create(3NSL)
clntraw_create
rpc_soc(3NSL)
clnttcp_create
rpc_soc(3NSL)
clntudp_bufcreate
rpc_soc(3NSL)
get_myaddress
rpc_soc(3NSL)
getnetname
secure_rpc(3NSL)
host2netname
secure_rpc(3NSL)
key_decryptsession
secure_rpc(3NSL)
key_encryptsession
secure_rpc(3NSL)
key_gendes
secure_rpc(3NSL)
key_setsecret
secure_rpc(3NSL)
netname2host
secure_rpc(3NSL)
netname2user
secure_rpc(3NSL)
pmap_getmaps
rpc_soc(3NSL)
pmap_getport
rpc_soc(3NSL)
pmap_rmtcall
rpc_soc(3NSL)
pmap_set
rpc_soc(3NSL)
pmap_unset
rpc_soc(3NSL)
rac_drop
rpc_rac(3RAC)
rac_poll
rpc_rac(3RAC)
rac_recv
rpc_rac(3RAC)
rac_send
rpc_rac(3RAC)
registerrpc
rpc_soc(3NSL)
rpc_broadcast
rpc_clnt_calls(3NSL)
rpc_broadcast_exp
rpc_clnt_calls(3NSL)
rpc_call
rpc_clnt_calls(3NSL)
rpc_reg
rpc_svc_calls(3NSL)
svc_create
rpc_svc_create(3NSL)
svc_destroy
rpc_svc_create(3NSL)
svc_dg_create
rpc_svc_create(3NSL)
svc_dg_enablecache
rpc_svc_calls(3NSL)
svc_fd_create
rpc_svc_create(3NSL)
svc_fds
rpc_soc(3NSL)
svc_freeargs
rpc_svc_reg(3NSL)
svc_getargs
rpc_svc_reg(3NSL)
svc_getcaller
rpc_soc(3NSL)
svc_getreq
rpc_soc(3NSL)
svc_getreqset
rpc_svc_calls(3NSL)
svc_getrpccaller
rpc_svc_calls(3NSL)
svc_raw_create
rpc_svc_create(3NSL)
svc_reg
rpc_svc_calls(3NSL)
svc_register
rpc_soc(3NSL)
svc_run
rpc_svc_reg(3NSL)
svc_sendreply
rpc_svc_reg(3NSL)
svc_tli_create
rpc_svc_create(3NSL)
svc_tp_create
rpc_svc_create(3NSL)
svc_unreg
rpc_svc_calls(3NSL)
svc_unregister
rpc_soc(3NSL)
svc_vc_create
rpc_svc_create(3NSL)
svcerr_auth
rpc_svc_err(3NSL)
svcerr_decode
rpc_svc_err(3NSL)
svcerr_noproc
rpc_svc_err(3NSL)
svcerr_noprog
rpc_svc_err(3NSL)
svcerr_progvers
rpc_svc_err(3NSL)
svcerr_systemerr
rpc_svc_err(3NSL)
svcerr_weakauth
rpc_svc_err(3NSL)
svcfd_create
rpc_soc(3NSL)
svcraw_create
rpc_soc(3NSL)
svctcp_create
rpc_soc(3NSL)
svcudp_bufcreate
rpc_soc(3NSL)
svcudp_create
rpc_soc(3NSL)
user2netname
secure_rpc(3NSL)
xdr_accepted_reply
rpc_xdr(3NSL)
xdr_authsys_parms
rpc_xdr(3NSL)
xdr_authunix_parms
rpc_soc(3NSL)
xdr_callhdr
rpc_xdr(3NSL)
xdr_callmsg
rpc_xdr(3NSL)
xdr_opaque_auth
rpc_xdr(3NSL)
xdr_rejected_reply
rpc_xdr(3NSL)
xdr_replymsg
rpc_xdr(3NSL)
xprt_register
rpc_svc_calls(3NSL)
xprt_unregister
rpc_svc_calls(3NSL)

FILES

 
/etc/netconfig

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe with exceptions

SEE ALSO

 

getnetconfig(3NSL), getnetpath(3NSL), rpc_clnt_auth(3NSL), rpc_clnt_calls(3NSL), rpc_clnt_create(3NSL), rpc_svc_calls(3NSL), rpc_svc_create(3NSL), rpc_svc_err(3NSL), rpc_svc_reg(3NSL), rpc_xdr(3NSL), rpcbind(3NSL), secure_rpc(3NSL), threads(3THR), xdr(3NSL), netconfig(4), rpc(4), attributes(5), environ(5)


SunOS 5.9Go To TopLast Changed 5 Jun 2001

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.