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NAME | LIBRARY | SYNOPSIS AND DESCRIPTION | ATTRIBUTES | SEE ALSO | COLOPHON |
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rpc(3) Library Functions Manual rpc(3)
rpc - library routines for remote procedure calls
Standard C library (libc, -lc)
These routines allow C programs to make procedure calls on other
machines across the network. First, the client calls a procedure
to send a data packet to the server. Upon receipt of the packet,
the server calls a dispatch routine to perform the requested
service, and then sends back a reply. Finally, the procedure call
returns to the client.
To take use of these routines, include the header file
<rpc/rpc.h>.
The prototypes below make use of the following types:
typedef int bool_t;
typedef typeof(bool_t (XDR *, void *, ...)) *xdrproc_t;
typedef typeof(bool_t (caddr_t resp, struct sockaddr_in *raddr)
*resultproc_t;
See the header files for the declarations of the AUTH, CLIENT,
SVCXPRT, and XDR types.
void auth_destroy(AUTH *auth);
A macro that destroys the authentication information
associated with auth. Destruction usually involves
deallocation of private data structures. The use of auth
is undefined after calling auth_destroy().
AUTH *authnone_create(void);
Create and return an RPC authentication handle that passes
nonusable authentication information with each remote
procedure call. This is the default authentication used by
RPC.
AUTH *authunix_create(char *host, uid_t uid, gid_t gid,
int n, gid_t aup_gids[n]);
Create and return an RPC authentication handle that
contains authentication information. The parameter host is
the name of the machine on which the information was
created; uid is the user's user ID; gid is the user's
current group ID; n and aup_gids refer to a counted array
of groups to which the user belongs. It is easy to
impersonate a user.
AUTH *authunix_create_default(void);
Calls authunix_create() with the appropriate parameters.
int callrpc(char *host, unsigned long prognum,
unsigned long versnum, unsigned long procnum,
xdrproc_t inproc, const char *in,
xdrproc_t outproc, char *out);
Call the remote procedure associated with prognum, versnum,
and procnum on the machine, host. The parameter in is the
address of the procedure's argument(s), and out is the
address of where to place the result(s); inproc is used to
encode the procedure's parameters, and outproc is used to
decode the procedure's results. This routine returns zero
if it succeeds, or the value of enum clnt_stat cast to an
integer if it fails. The routine clnt_perrno() is handy
for translating failure statuses into messages.
Warning: calling remote procedures with this routine uses
UDP/IP as a transport; see clntudp_create() for
restrictions. You do not have control of timeouts or
authentication using this routine.
enum clnt_stat clnt_broadcast(unsigned long prognum,
unsigned long versnum, unsigned long procnum,
xdrproc_t inproc, char *in,
xdrproc_t outproc, char *out,
resultproc_t eachresult);
Like callrpc(), except the call message is broadcast to all
locally connected broadcast nets. Each time it receives a
response, this routine calls eachresult(), whose form is:
eachresult(char *out, struct sockaddr_in *addr);
where out is the same as out passed to clnt_broadcast(),
except that the remote procedure's output is decoded there;
addr points to the address of the machine that sent the
results. If eachresult() returns zero, clnt_broadcast()
waits for more replies; otherwise it returns with
appropriate status.
Warning: broadcast sockets are limited in size to the
maximum transfer unit of the data link. For ethernet, this
value is 1500 bytes.
enum clnt_stat clnt_call(CLIENT *clnt, unsigned long procnum,
xdrproc_t inproc, char *in,
xdrproc_t outproc, char *out,
struct timeval tout);
A macro that calls the remote procedure procnum associated
with the client handle, clnt, which is obtained with an RPC
client creation routine such as clnt_create(). The
parameter in is the address of the procedure's argument(s),
and out is the address of where to place the result(s);
inproc is used to encode the procedure's parameters, and
outproc is used to decode the procedure's results; tout is
the time allowed for results to come back.
clnt_destroy(CLIENT *clnt);
A 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 socket, it will close it also. Otherwise, the
socket remains open.
CLIENT *clnt_create(const char *host, unsigned long prog,
unsigned long vers, const char *proto);
Generic client creation routine. host identifies the name
of the remote host where the server is located. proto
indicates which kind of transport protocol to use. The
currently supported values for this field are “udp” and
“tcp”. Default timeouts are set, but can be modified using
clnt_control().
Warning: using UDP has its shortcomings. Since UDP-based
RPC messages can hold only up to 8 Kbytes of encoded data,
this transport cannot be used for procedures that take
large arguments or return huge results.
bool_t clnt_control(CLIENT *cl, int req, char *info);
A macro used to change or retrieve various information
about a client object. req indicates the type of
operation, and info is a pointer to the information. For
both UDP and TCP, 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 parameter passed to clnt_call() will be ignored in
all future calls.
CLGET_SERVER_ADDR struct sockaddr_in
// get server's address
The following operations are valid for UDP only:
CLSET_RETRY_TIMEOUT struct timeval // set the retry timeout
CLGET_RETRY_TIMEOUT struct timeval // get the retry timeout
The retry timeout is the time that "UDP RPC" waits for the
server to reply before retransmitting the request.
clnt_freeres(CLIENT * clnt, xdrproc_t outproc, char *out);
A macro that frees any data allocated by the RPC/XDR system
when it decoded the results of an RPC call. The parameter
out is the address of the results, and outproc is the XDR
routine describing the results. This routine returns one
if the results were successfully freed, and zero otherwise.
void clnt_geterr(CLIENT *clnt, struct rpc_err *errp);
A macro that copies the error structure out of the client
handle to the structure at address errp.
void clnt_pcreateerror(const char *s);
Print a message to standard error indicating why a client
RPC handle could not be created. The message is prepended
with string s and a colon. Used when a clnt_create(),
clntraw_create(), clnttcp_create(), or clntudp_create()
call fails.
void clnt_perrno(enum clnt_stat stat);
Print a message to standard error corresponding to the
condition indicated by stat. Used after callrpc().
clnt_perror(CLIENT *clnt, const char *s);
Print a message to standard error indicating why an RPC
call failed; clnt is the handle used to do the call. The
message is prepended with string s and a colon. Used after
clnt_call().
char *clnt_spcreateerror(const char *s);
Like clnt_pcreateerror(), except that it returns a string
instead of printing to the standard error.
Bugs: returns pointer to static data that is overwritten on
each call.
char *clnt_sperrno(enum clnt_stat stat);
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 string ends with a NEWLINE.
clnt_sperrno() is used instead of clnt_perrno() if 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(3), or if a message format different than that
supported by clnt_perrno() is to be used. Note: unlike
clnt_sperror() and clnt_spcreateerror(), clnt_sperrno()
returns pointer to static data, but the result will not get
overwritten on each call.
char *clnt_sperror(CLIENT *rpch, const char *s);
Like clnt_perror(), except that (like clnt_sperrno()) it
returns a string instead of printing to standard error.
Bugs: returns pointer to static data that is overwritten on
each call.
CLIENT *clntraw_create(unsigned long prognum, unsigned long versnum);
This routine creates a toy RPC client for the remote
program prognum, version versnum. The transport used to
pass messages to the service is actually a buffer within
the process's address space, so the corresponding RPC
server should live in the same address space; see
svcraw_create(). This allows simulation of RPC and
acquisition of RPC overheads, such as round trip times,
without any kernel interference. This routine returns NULL
if it fails.
CLIENT *clnttcp_create(struct sockaddr_in *addr,
unsigned long prognum, unsigned long versnum,
int *sockp, unsigned int sendsz, unsigned int recvsz);
This routine creates an RPC client for the remote program
prognum, version versnum; the client uses TCP/IP as a
transport. The remote program is located at Internet
address *addr. If addr->sin_port is zero, then it is set
to the actual port that the remote program is listening on
(the remote portmap service is consulted for this
information). The parameter sockp is a socket; if it is
RPC_ANYSOCK, then this routine opens a new one and sets
sockp. Since TCP-based RPC uses buffered I/O, the user may
specify the size of the send and receive buffers with the
parameters sendsz and recvsz; values of zero choose
suitable defaults. This routine returns NULL if it fails.
CLIENT *clntudp_create(struct sockaddr_in *addr,
unsigned long prognum, unsigned long versnum,
struct timeval wait, int *sockp);
This routine creates an RPC client for the remote program
prognum, version versnum; the client uses use UDP/IP as a
transport. The remote program is located at Internet
address addr. If addr->sin_port is zero, then it is set to
actual port that the remote program is listening on (the
remote portmap service is consulted for this information).
The parameter sockp is a socket; if it is RPC_ANYSOCK, then
this routine opens a new one and sets sockp. The UDP
transport resends the call message in intervals of wait
time 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().
Warning: since UDP-based RPC messages can hold only up to 8
Kbytes of encoded data, this transport cannot be used for
procedures that take large arguments or return huge
results.
CLIENT *clntudp_bufcreate(struct sockaddr_in *addr,
unsigned long prognum, unsigned long versnum,
struct timeval wait, int *sockp,
unsigned int sendsize, unsigned int recosize);
This routine creates an RPC client for the remote program
prognum, on versnum; the client uses use UDP/IP as a
transport. The remote program is located at Internet
address addr. If addr->sin_port is zero, then it is set to
actual port that the remote program is listening on (the
remote portmap service is consulted for this information).
The parameter sockp is a socket; if it is RPC_ANYSOCK, then
this routine opens a new one and sets sockp. The UDP
transport resends the call message in intervals of wait
time 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().
This allows the user to specify the maximum packet size for
sending and receiving UDP-based RPC messages.
void get_myaddress(struct sockaddr_in *addr);
Stuff the machine's IP address into *addr, without
consulting the library routines that deal with /etc/hosts.
The port number is always set to htons(PMAPPORT).
struct pmaplist *pmap_getmaps(struct sockaddr_in *addr);
A user interface to the portmap service, which returns a
list of the current RPC program-to-port mappings on the
host located at IP address *addr. This routine can return
NULL. The command rpcinfo -p uses this routine.
unsigned short pmap_getport(struct sockaddr_in *addr,
unsigned long prognum, unsigned long versnum,
unsigned int protocol);
A user interface to the portmap service, which returns the
port number on which waits a service that supports program
number prognum, version versnum, and speaks the transport
protocol associated with protocol. The value of protocol
is most likely IPPROTO_UDP or IPPROTO_TCP. A return value
of zero means that the mapping does not exist or that the
RPC system failed to contact the remote portmap service.
In the latter case, the global variable rpc_createerr
contains the RPC status.
enum clnt_stat pmap_rmtcall(struct sockaddr_in *addr,
unsigned long prognum, unsigned long versnum,
unsigned long procnum,
xdrproc_t inproc, char *in,
xdrproc_t outproc, char *out,
struct timeval tout, unsigned long *portp);
A user interface to the portmap service, which instructs
portmap on the host at IP address *addr to make an RPC call
on your behalf to a procedure on that host. The parameter
*portp will be modified to the program's port number if the
procedure succeeds. The definitions of other parameters
are discussed in callrpc() and clnt_call(). This procedure
should be used for a “ping” and nothing else. See also
clnt_broadcast().
bool_t pmap_set(unsigned long prognum, unsigned long versnum,
int protocol, unsigned short port);
A user interface to the portmap service, which establishes
a mapping between the triple [prognum,versnum,protocol] and
port on the machine's portmap service. The value of
protocol is most likely IPPROTO_UDP or IPPROTO_TCP. This
routine returns one if it succeeds, zero otherwise.
Automatically done by svc_register().
bool_t pmap_unset(unsigned long prognum, unsigned long versnum);
A user interface to the portmap service, which destroys all
mapping between the triple [prognum,versnum,*] and ports on
the machine's portmap service. This routine returns one if
it succeeds, zero otherwise.
int registerrpc(unsigned long prognum, unsigned long versnum,
unsigned long procnum, typeof(char *(char *)) *procname,
xdrproc_t inproc, xdrproc_t outproc);
Register procedure procname with the RPC service package.
If a request arrives for program prognum, version versnum,
and procedure procnum, procname is called with a pointer to
its parameter(s); procname should return a pointer to its
static result(s); inproc is used to decode the parameters
while outproc is used to encode the results. This routine
returns zero if the registration succeeded, -1 otherwise.
Warning: remote procedures registered in this form are
accessed using the UDP/IP transport; see svcudp_create()
for restrictions.
struct rpc_createerr rpc_createerr;
A global variable whose value is set by any RPC client
creation routine that does not succeed. Use the routine
clnt_pcreateerror() to print the reason why.
void svc_destroy(SVCXPRT *xprt);
A macro that destroys the RPC service transport handle,
xprt. Destruction usually involves deallocation of private
data structures, including xprt itself. Use of xprt is
undefined after calling this routine.
fd_set svc_fdset;
A global variable reflecting the RPC service side's read
file descriptor bit mask; it is suitable as a parameter to
the select(2) system call. This is of interest only if a
service implementor does their own asynchronous event
processing, instead of calling svc_run(). This variable is
read-only (do not pass its address to select(2)!), yet it
may change after calls to svc_getreqset() or any creation
routines.
int svc_fds;
Similar to svc_fdset, but limited to 32 file descriptors.
This interface is obsoleted by svc_fdset.
svc_freeargs(SVCXPRT *xprt, xdrproc_t inproc, char *in);
A macro that frees any data allocated by the RPC/XDR system
when it decoded the arguments to a service procedure using
svc_getargs(). This routine returns 1 if the results were
successfully freed, and zero otherwise.
svc_getargs(SVCXPRT *xprt, xdrproc_t inproc, char *in);
A macro that decodes the arguments of an RPC request
associated with the RPC service transport handle, xprt.
The parameter in is the address where the arguments will be
placed; inproc is the XDR routine used to decode the
arguments. This routine returns one if decoding succeeds,
and zero otherwise.
struct sockaddr_in *svc_getcaller(SVCXPRT *xprt);
The approved way of getting the network address of the
caller of a procedure associated with the RPC service
transport handle, xprt.
void svc_getreqset(fd_set *rdfds);
This routine is of interest only if a service implementor
does not call svc_run(), but instead implements custom
asynchronous event processing. It is called when the
select(2) system call has determined that an RPC request
has arrived on some RPC socket(s); rdfds is the resultant
read file descriptor bit mask. The routine returns when
all sockets associated with the value of rdfds have been
serviced.
void svc_getreq(int rdfds);
Similar to svc_getreqset(), but limited to 32 file
descriptors. This interface is obsoleted by
svc_getreqset().
bool_t svc_register(SVCXPRT *xprt, unsigned long prognum,
unsigned long versnum,
typeof(void (struct svc_req *, SVCXPRT *)) *dispatch,
unsigned long protocol);
Associates prognum and versnum with the service dispatch
procedure, dispatch. If protocol is zero, the service is
not registered with the portmap service. If protocol is
nonzero, then a mapping of the triple
[prognum,versnum,protocol] to xprt->xp_port is established
with the local portmap service (generally protocol is zero,
IPPROTO_UDP or IPPROTO_TCP). The procedure dispatch has
the following form:
dispatch(struct svc_req *request, SVCXPRT *xprt);
The svc_register() routine returns one if it succeeds, and
zero otherwise.
void svc_run(void);
This routine never returns. It waits for RPC requests to
arrive, and calls the appropriate service procedure using
svc_getreq() when one arrives. This procedure is usually
waiting for a select(2) system call to return.
bool_t svc_sendreply(SVCXPRT *xprt, xdrproc_t outproc, char *out);
Called by an RPC service's dispatch routine to send the
results of a remote procedure call. The parameter xprt is
the request's associated transport handle; outproc is the
XDR routine which is used to encode the results; and out is
the address of the results. This routine returns one if it
succeeds, zero otherwise.
void svc_unregister(unsigned long prognum, unsigned long versnum);
Remove all mapping of the double [prognum,versnum] to
dispatch routines, and of the triple [prognum,versnum,*] to
port number.
void svcerr_auth(SVCXPRT *xprt, enum auth_stat why);
Called by a service dispatch routine that refuses to
perform a remote procedure call due to an authentication
error.
void svcerr_decode(SVCXPRT *xprt);
Called by a service dispatch routine that cannot
successfully decode its parameters. See also
svc_getargs().
void svcerr_noproc(SVCXPRT *xprt);
Called by a service dispatch routine that does not
implement the procedure number that the caller requests.
void svcerr_noprog(SVCXPRT *xprt);
Called when the desired program is not registered with the
RPC package. Service implementors usually do not need this
routine.
void svcerr_progvers(SVCXPRT *xprt, unsigned long low_vers,
unsigned long high_vers);
Called when the desired version of a program is not
registered with the RPC package. Service implementors
usually do not need this routine.
void svcerr_systemerr(SVCXPRT *xprt);
Called by a service dispatch routine when it detects a
system error not covered by any particular protocol. For
example, if a service can no longer allocate storage, it
may call this routine.
void svcerr_weakauth(SVCXPRT *xprt);
Called by a service dispatch routine that refuses to
perform a remote procedure call due to insufficient
authentication parameters. The routine calls
svcerr_auth(xprt, AUTH_TOOWEAK).
SVCXPRT *svcfd_create(int fd, unsigned int sendsize,
unsigned int recvsize);
Create a service on top of any open file descriptor.
Typically, this file descriptor is a connected socket for a
stream protocol such as TCP. sendsize and recvsize
indicate sizes for the send and receive buffers. If they
are zero, a reasonable default is chosen.
SVCXPRT *svcraw_create(void);
This routine creates a toy RPC service transport, to which
it returns a pointer. 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
clntraw_create(). This routine allows simulation of RPC
and acquisition of RPC overheads (such as round trip
times), without any kernel interference. This routine
returns NULL if it fails.
SVCXPRT *svctcp_create(int sock, unsigned int send_buf_size,
unsigned int recv_buf_size);
This routine creates a TCP/IP-based RPC service transport,
to which it returns a pointer. The transport is associated
with the socket sock, which may be RPC_ANYSOCK, in which
case a new socket is created. If the socket is not bound
to a local TCP port, then this routine binds it to an
arbitrary port. Upon completion, xprt->xp_sock is the
transport's socket descriptor, and xprt->xp_port is the
transport's port number. This routine returns NULL if it
fails. Since TCP-based RPC uses buffered I/O, users may
specify the size of buffers; values of zero choose suitable
defaults.
SVCXPRT *svcudp_bufcreate(int sock, unsigned int sendsize,
unsigned int recosize);
This routine creates a UDP/IP-based RPC service transport,
to which it returns a pointer. The transport is associated
with the socket sock, which may be RPC_ANYSOCK, in which
case a new socket is created. If the socket is not bound
to a local UDP port, then this routine binds it to an
arbitrary port. Upon completion, xprt->xp_sock is the
transport's socket descriptor, and xprt->xp_port is the
transport's port number. This routine returns NULL if it
fails.
This allows the user to specify the maximum packet size for
sending and receiving UDP-based RPC messages.
SVCXPRT *svcudp_create(int sock);
This call is equivalent to svcudp_bufcreate(sock,SZ,SZ) for
some default size SZ.
bool_t xdr_accepted_reply(XDR *xdrs, struct accepted_reply *ar);
Used for encoding RPC reply messages. This routine is
useful for users who wish to generate RPC-style messages
without using the RPC package.
bool_t xdr_authunix_parms(XDR *xdrs, struct authunix_parms *aupp);
Used for describing UNIX credentials. This routine is
useful for users who wish to generate these credentials
without using the RPC authentication package.
void xdr_callhdr(XDR *xdrs, struct rpc_msg *chdr);
Used for describing RPC call header messages. This routine
is useful for users who wish to generate RPC-style messages
without using the RPC package.
bool_t xdr_callmsg(XDR *xdrs, struct rpc_msg *cmsg);
Used for describing RPC call messages. This routine is
useful for users who wish to generate RPC-style messages
without using the RPC package.
bool_t xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap);
Used for describing RPC authentication information
messages. This routine is useful for users who wish to
generate RPC-style messages without using the RPC package.
bool_t xdr_pmap(XDR *xdrs, struct pmap *regs);
Used for describing parameters to various portmap
procedures, externally. This routine is useful for users
who wish to generate these parameters without using the
pmap interface.
bool_t xdr_pmaplist(XDR *xdrs, struct pmaplist **rp);
Used for describing a list of port mappings, externally.
This routine is useful for users who wish to generate these
parameters without using the pmap interface.
bool_t xdr_rejected_reply(XDR *xdrs, struct rejected_reply *rr);
Used for describing RPC reply messages. This routine is
useful for users who wish to generate RPC-style messages
without using the RPC package.
bool_t xdr_replymsg(XDR *xdrs, struct rpc_msg *rmsg);
Used for describing RPC reply messages. This routine is
useful for users who wish to generate RPC style messages
without using the RPC package.
void xprt_register(SVCXPRT *xprt);
After RPC service transport handles are created, they
should register themselves with the RPC service package.
This routine modifies the global variable svc_fds. Service
implementors usually do not need this routine.
void xprt_unregister(SVCXPRT *xprt);
Before an RPC service transport handle is destroyed, it
should unregister itself with the RPC service package.
This routine modifies the global variable svc_fds. Service
implementors usually do not need this routine.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ auth_destroy(), authnone_create(), │ Thread safety │ MT-Safe │
│ authunix_create(), │ │ │
│ authunix_create_default(), │ │ │
│ callrpc(), clnt_broadcast(), │ │ │
│ clnt_call(), clnt_destroy(), │ │ │
│ clnt_create(), clnt_control(), │ │ │
│ clnt_freeres(), clnt_geterr(), │ │ │
│ clnt_pcreateerror(), clnt_perrno(), │ │ │
│ clnt_perror(), clnt_spcreateerror(), │ │ │
│ clnt_sperrno(), clnt_sperror(), │ │ │
│ clntraw_create(), clnttcp_create(), │ │ │
│ clntudp_create(), │ │ │
│ clntudp_bufcreate(), │ │ │
│ get_myaddress(), pmap_getmaps(), │ │ │
│ pmap_getport(), pmap_rmtcall(), │ │ │
│ pmap_set(), pmap_unset(), │ │ │
│ registerrpc(), svc_destroy(), │ │ │
│ svc_freeargs(), svc_getargs(), │ │ │
│ svc_getcaller(), svc_getreqset(), │ │ │
│ svc_getreq(), svc_register(), │ │ │
│ svc_run(), svc_sendreply(), │ │ │
│ svc_unregister(), svcerr_auth(), │ │ │
│ svcerr_decode(), svcerr_noproc(), │ │ │
│ svcerr_noprog(), svcerr_progvers(), │ │ │
│ svcerr_systemerr(), │ │ │
│ svcerr_weakauth(), svcfd_create(), │ │ │
│ svcraw_create(), svctcp_create(), │ │ │
│ svcudp_bufcreate(), svcudp_create(), │ │ │
│ xdr_accepted_reply(), │ │ │
│ xdr_authunix_parms(), xdr_callhdr(), │ │ │
│ xdr_callmsg(), xdr_opaque_auth(), │ │ │
│ xdr_pmap(), xdr_pmaplist(), │ │ │
│ xdr_rejected_reply(), │ │ │
│ xdr_replymsg(), xprt_register(), │ │ │
│ xprt_unregister() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
xdr(3)
The following manuals:
Remote Procedure Calls: Protocol Specification
Remote Procedure Call Programming Guide
rpcgen Programming Guide
RPC: Remote Procedure Call Protocol Specification, RFC 1050, Sun
Microsystems, Inc., USC-ISI.
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Linux man-pages 6.15 2025-05-17 rpc(3)
Pages that refer to this page: autofsd-probe(1), xdr(3), rpc.rquotad(8)
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