FreeBSD-5.3/lib/libc/rpc/svc_vc.c
/* $NetBSD: svc_vc.c,v 1.7 2000/08/03 00:01:53 fvdl Exp $ */
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *sccsid = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/rpc/svc_vc.c,v 1.23 2004/08/13 23:22:38 stefanf Exp $");
/*
* svc_vc.c, Server side for Connection Oriented based RPC.
*
* Actually implements two flavors of transporter -
* a tcp rendezvouser (a listner and connection establisher)
* and a record/tcp stream.
*/
#include "namespace.h"
#include "reentrant.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include "rpc_com.h"
#include "un-namespace.h"
extern rwlock_t svc_fd_lock;
static SVCXPRT *makefd_xprt(int, u_int, u_int);
static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *);
static enum xprt_stat rendezvous_stat(SVCXPRT *);
static void svc_vc_destroy(SVCXPRT *);
static void __svc_vc_dodestroy (SVCXPRT *);
static int read_vc(void *, void *, int);
static int write_vc(void *, void *, int);
static enum xprt_stat svc_vc_stat(SVCXPRT *);
static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *);
static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, void *);
static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, void *);
static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *);
static void svc_vc_rendezvous_ops(SVCXPRT *);
static void svc_vc_ops(SVCXPRT *);
static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in);
static bool_t svc_vc_rendezvous_control (SVCXPRT *xprt, const u_int rq,
void *in);
struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
u_int sendsize;
u_int recvsize;
int maxrec;
};
struct cf_conn { /* kept in xprt->xp_p1 for actual connection */
enum xprt_stat strm_stat;
u_int32_t x_id;
XDR xdrs;
char verf_body[MAX_AUTH_BYTES];
u_int sendsize;
u_int recvsize;
int maxrec;
bool_t nonblock;
struct timeval last_recv_time;
};
/*
* Usage:
* xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
*
* Creates, registers, and returns a (rpc) tcp based transporter.
* Once *xprt is initialized, it is registered as a transporter
* see (svc.h, xprt_register). This routine returns
* a NULL if a problem occurred.
*
* The filedescriptor passed in is expected to refer to a bound, but
* not yet connected socket.
*
* Since streams do buffered io similar to stdio, the caller can specify
* how big the send and receive buffers are via the second and third parms;
* 0 => use the system default.
*/
SVCXPRT *
svc_vc_create(fd, sendsize, recvsize)
int fd;
u_int sendsize;
u_int recvsize;
{
SVCXPRT *xprt;
struct cf_rendezvous *r = NULL;
struct __rpc_sockinfo si;
struct sockaddr_storage sslocal;
socklen_t slen;
r = mem_alloc(sizeof(*r));
if (r == NULL) {
warnx("svc_vc_create: out of memory");
goto cleanup_svc_vc_create;
}
if (!__rpc_fd2sockinfo(fd, &si))
return NULL;
r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
r->maxrec = __svc_maxrec;
xprt = mem_alloc(sizeof(SVCXPRT));
if (xprt == NULL) {
warnx("svc_vc_create: out of memory");
goto cleanup_svc_vc_create;
}
xprt->xp_tp = NULL;
xprt->xp_p1 = r;
xprt->xp_p2 = NULL;
xprt->xp_p3 = NULL;
xprt->xp_verf = _null_auth;
svc_vc_rendezvous_ops(xprt);
xprt->xp_port = (u_short)-1; /* It is the rendezvouser */
xprt->xp_fd = fd;
slen = sizeof (struct sockaddr_storage);
if (_getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
warnx("svc_vc_create: could not retrieve local addr");
goto cleanup_svc_vc_create;
}
xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
if (xprt->xp_ltaddr.buf == NULL) {
warnx("svc_vc_create: no mem for local addr");
goto cleanup_svc_vc_create;
}
memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
xprt_register(xprt);
return (xprt);
cleanup_svc_vc_create:
if (r != NULL)
mem_free(r, sizeof(*r));
return (NULL);
}
/*
* Like svtcp_create(), except the routine takes any *open* UNIX file
* descriptor as its first input.
*/
SVCXPRT *
svc_fd_create(fd, sendsize, recvsize)
int fd;
u_int sendsize;
u_int recvsize;
{
struct sockaddr_storage ss;
socklen_t slen;
SVCXPRT *ret;
assert(fd != -1);
ret = makefd_xprt(fd, sendsize, recvsize);
if (ret == NULL)
return NULL;
slen = sizeof (struct sockaddr_storage);
if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
warnx("svc_fd_create: could not retrieve local addr");
goto freedata;
}
ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
if (ret->xp_ltaddr.buf == NULL) {
warnx("svc_fd_create: no mem for local addr");
goto freedata;
}
memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
slen = sizeof (struct sockaddr_storage);
if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
warnx("svc_fd_create: could not retrieve remote addr");
goto freedata;
}
ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
if (ret->xp_rtaddr.buf == NULL) {
warnx("svc_fd_create: no mem for local addr");
goto freedata;
}
memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
#ifdef PORTMAP
if (ss.ss_family == AF_INET || ss.ss_family == AF_LOCAL) {
ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
ret->xp_addrlen = sizeof (struct sockaddr_in);
}
#endif /* PORTMAP */
return ret;
freedata:
if (ret->xp_ltaddr.buf != NULL)
mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
return NULL;
}
static SVCXPRT *
makefd_xprt(fd, sendsize, recvsize)
int fd;
u_int sendsize;
u_int recvsize;
{
SVCXPRT *xprt;
struct cf_conn *cd;
const char *netid;
struct __rpc_sockinfo si;
assert(fd != -1);
xprt = mem_alloc(sizeof(SVCXPRT));
if (xprt == NULL) {
warnx("svc_vc: makefd_xprt: out of memory");
goto done;
}
memset(xprt, 0, sizeof *xprt);
cd = mem_alloc(sizeof(struct cf_conn));
if (cd == NULL) {
warnx("svc_tcp: makefd_xprt: out of memory");
mem_free(xprt, sizeof(SVCXPRT));
xprt = NULL;
goto done;
}
cd->strm_stat = XPRT_IDLE;
xdrrec_create(&(cd->xdrs), sendsize, recvsize,
xprt, read_vc, write_vc);
xprt->xp_p1 = cd;
xprt->xp_verf.oa_base = cd->verf_body;
svc_vc_ops(xprt); /* truely deals with calls */
xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
xprt->xp_fd = fd;
if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
xprt->xp_netid = strdup(netid);
xprt_register(xprt);
done:
return (xprt);
}
/*ARGSUSED*/
static bool_t
rendezvous_request(xprt, msg)
SVCXPRT *xprt;
struct rpc_msg *msg;
{
int sock, flags;
struct cf_rendezvous *r;
struct cf_conn *cd;
struct sockaddr_storage addr;
socklen_t len;
struct __rpc_sockinfo si;
SVCXPRT *newxprt;
fd_set cleanfds;
assert(xprt != NULL);
assert(msg != NULL);
r = (struct cf_rendezvous *)xprt->xp_p1;
again:
len = sizeof addr;
if ((sock = _accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
&len)) < 0) {
if (errno == EINTR)
goto again;
/*
* Clean out the most idle file descriptor when we're
* running out.
*/
if (errno == EMFILE || errno == ENFILE) {
cleanfds = svc_fdset;
__svc_clean_idle(&cleanfds, 0, FALSE);
goto again;
}
return (FALSE);
}
/*
* make a new transporter (re-uses xprt)
*/
newxprt = makefd_xprt(sock, r->sendsize, r->recvsize);
newxprt->xp_rtaddr.buf = mem_alloc(len);
if (newxprt->xp_rtaddr.buf == NULL)
return (FALSE);
memcpy(newxprt->xp_rtaddr.buf, &addr, len);
newxprt->xp_rtaddr.len = len;
#ifdef PORTMAP
if (addr.ss_family == AF_INET || addr.ss_family == AF_LOCAL) {
newxprt->xp_raddr = *(struct sockaddr_in *)newxprt->xp_rtaddr.buf;
newxprt->xp_addrlen = sizeof (struct sockaddr_in);
}
#endif /* PORTMAP */
if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) {
len = 1;
/* XXX fvdl - is this useful? */
_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len));
}
cd = (struct cf_conn *)newxprt->xp_p1;
cd->recvsize = r->recvsize;
cd->sendsize = r->sendsize;
cd->maxrec = r->maxrec;
if (cd->maxrec != 0) {
flags = _fcntl(sock, F_GETFL, 0);
if (flags == -1)
return (FALSE);
if (_fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1)
return (FALSE);
if (cd->recvsize > cd->maxrec)
cd->recvsize = cd->maxrec;
cd->nonblock = TRUE;
__xdrrec_setnonblock(&cd->xdrs, cd->maxrec);
} else
cd->nonblock = FALSE;
gettimeofday(&cd->last_recv_time, NULL);
return (FALSE); /* there is never an rpc msg to be processed */
}
/*ARGSUSED*/
static enum xprt_stat
rendezvous_stat(xprt)
SVCXPRT *xprt;
{
return (XPRT_IDLE);
}
static void
svc_vc_destroy(xprt)
SVCXPRT *xprt;
{
assert(xprt != NULL);
xprt_unregister(xprt);
__svc_vc_dodestroy(xprt);
}
static void
__svc_vc_dodestroy(xprt)
SVCXPRT *xprt;
{
struct cf_conn *cd;
struct cf_rendezvous *r;
cd = (struct cf_conn *)xprt->xp_p1;
if (xprt->xp_fd != RPC_ANYFD)
(void)_close(xprt->xp_fd);
if (xprt->xp_port != 0) {
/* a rendezvouser socket */
r = (struct cf_rendezvous *)xprt->xp_p1;
mem_free(r, sizeof (struct cf_rendezvous));
xprt->xp_port = 0;
} else {
/* an actual connection socket */
XDR_DESTROY(&(cd->xdrs));
mem_free(cd, sizeof(struct cf_conn));
}
if (xprt->xp_rtaddr.buf)
mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
if (xprt->xp_ltaddr.buf)
mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
if (xprt->xp_tp)
free(xprt->xp_tp);
if (xprt->xp_netid)
free(xprt->xp_netid);
mem_free(xprt, sizeof(SVCXPRT));
}
/*ARGSUSED*/
static bool_t
svc_vc_control(xprt, rq, in)
SVCXPRT *xprt;
const u_int rq;
void *in;
{
return (FALSE);
}
static bool_t
svc_vc_rendezvous_control(xprt, rq, in)
SVCXPRT *xprt;
const u_int rq;
void *in;
{
struct cf_rendezvous *cfp;
cfp = (struct cf_rendezvous *)xprt->xp_p1;
if (cfp == NULL)
return (FALSE);
switch (rq) {
case SVCGET_CONNMAXREC:
*(int *)in = cfp->maxrec;
break;
case SVCSET_CONNMAXREC:
cfp->maxrec = *(int *)in;
break;
default:
return (FALSE);
}
return (TRUE);
}
/*
* reads data from the tcp or uip connection.
* any error is fatal and the connection is closed.
* (And a read of zero bytes is a half closed stream => error.)
* All read operations timeout after 35 seconds. A timeout is
* fatal for the connection.
*/
static int
read_vc(xprtp, buf, len)
void *xprtp;
void *buf;
int len;
{
SVCXPRT *xprt;
int sock;
int milliseconds = 35 * 1000;
struct pollfd pollfd;
struct cf_conn *cfp;
xprt = (SVCXPRT *)xprtp;
assert(xprt != NULL);
sock = xprt->xp_fd;
cfp = (struct cf_conn *)xprt->xp_p1;
if (cfp->nonblock) {
len = _read(sock, buf, (size_t)len);
if (len < 0) {
if (errno == EAGAIN)
len = 0;
else
goto fatal_err;
}
if (len != 0)
gettimeofday(&cfp->last_recv_time, NULL);
return len;
}
do {
pollfd.fd = sock;
pollfd.events = POLLIN;
pollfd.revents = 0;
switch (_poll(&pollfd, 1, milliseconds)) {
case -1:
if (errno == EINTR)
continue;
/*FALLTHROUGH*/
case 0:
goto fatal_err;
default:
break;
}
} while ((pollfd.revents & POLLIN) == 0);
if ((len = _read(sock, buf, (size_t)len)) > 0) {
gettimeofday(&cfp->last_recv_time, NULL);
return (len);
}
fatal_err:
((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
return (-1);
}
/*
* writes data to the tcp connection.
* Any error is fatal and the connection is closed.
*/
static int
write_vc(xprtp, buf, len)
void *xprtp;
void *buf;
int len;
{
SVCXPRT *xprt;
int i, cnt;
struct cf_conn *cd;
struct timeval tv0, tv1;
xprt = (SVCXPRT *)xprtp;
assert(xprt != NULL);
cd = (struct cf_conn *)xprt->xp_p1;
if (cd->nonblock)
gettimeofday(&tv0, NULL);
for (cnt = len; cnt > 0; cnt -= i, buf = (char *)buf + i) {
i = _write(xprt->xp_fd, buf, (size_t)cnt);
if (i < 0) {
if (errno != EAGAIN || !cd->nonblock) {
cd->strm_stat = XPRT_DIED;
return (-1);
}
if (cd->nonblock && i != cnt) {
/*
* For non-blocking connections, do not
* take more than 2 seconds writing the
* data out.
*
* XXX 2 is an arbitrary amount.
*/
gettimeofday(&tv1, NULL);
if (tv1.tv_sec - tv0.tv_sec >= 2) {
cd->strm_stat = XPRT_DIED;
return (-1);
}
}
}
}
return (len);
}
static enum xprt_stat
svc_vc_stat(xprt)
SVCXPRT *xprt;
{
struct cf_conn *cd;
assert(xprt != NULL);
cd = (struct cf_conn *)(xprt->xp_p1);
if (cd->strm_stat == XPRT_DIED)
return (XPRT_DIED);
if (! xdrrec_eof(&(cd->xdrs)))
return (XPRT_MOREREQS);
return (XPRT_IDLE);
}
static bool_t
svc_vc_recv(xprt, msg)
SVCXPRT *xprt;
struct rpc_msg *msg;
{
struct cf_conn *cd;
XDR *xdrs;
assert(xprt != NULL);
assert(msg != NULL);
cd = (struct cf_conn *)(xprt->xp_p1);
xdrs = &(cd->xdrs);
if (cd->nonblock) {
if (!__xdrrec_getrec(xdrs, &cd->strm_stat, TRUE))
return FALSE;
}
xdrs->x_op = XDR_DECODE;
(void)xdrrec_skiprecord(xdrs);
if (xdr_callmsg(xdrs, msg)) {
cd->x_id = msg->rm_xid;
return (TRUE);
}
cd->strm_stat = XPRT_DIED;
return (FALSE);
}
static bool_t
svc_vc_getargs(xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
void *args_ptr;
{
assert(xprt != NULL);
/* args_ptr may be NULL */
return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
args_ptr));
}
static bool_t
svc_vc_freeargs(xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
void *args_ptr;
{
XDR *xdrs;
assert(xprt != NULL);
/* args_ptr may be NULL */
xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
xdrs->x_op = XDR_FREE;
return ((*xdr_args)(xdrs, args_ptr));
}
static bool_t
svc_vc_reply(xprt, msg)
SVCXPRT *xprt;
struct rpc_msg *msg;
{
struct cf_conn *cd;
XDR *xdrs;
bool_t rstat;
assert(xprt != NULL);
assert(msg != NULL);
cd = (struct cf_conn *)(xprt->xp_p1);
xdrs = &(cd->xdrs);
xdrs->x_op = XDR_ENCODE;
msg->rm_xid = cd->x_id;
rstat = xdr_replymsg(xdrs, msg);
(void)xdrrec_endofrecord(xdrs, TRUE);
return (rstat);
}
static void
svc_vc_ops(xprt)
SVCXPRT *xprt;
{
static struct xp_ops ops;
static struct xp_ops2 ops2;
extern mutex_t ops_lock;
/* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
mutex_lock(&ops_lock);
if (ops.xp_recv == NULL) {
ops.xp_recv = svc_vc_recv;
ops.xp_stat = svc_vc_stat;
ops.xp_getargs = svc_vc_getargs;
ops.xp_reply = svc_vc_reply;
ops.xp_freeargs = svc_vc_freeargs;
ops.xp_destroy = svc_vc_destroy;
ops2.xp_control = svc_vc_control;
}
xprt->xp_ops = &ops;
xprt->xp_ops2 = &ops2;
mutex_unlock(&ops_lock);
}
static void
svc_vc_rendezvous_ops(xprt)
SVCXPRT *xprt;
{
static struct xp_ops ops;
static struct xp_ops2 ops2;
extern mutex_t ops_lock;
mutex_lock(&ops_lock);
if (ops.xp_recv == NULL) {
ops.xp_recv = rendezvous_request;
ops.xp_stat = rendezvous_stat;
ops.xp_getargs =
(bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort;
ops.xp_reply =
(bool_t (*)(SVCXPRT *, struct rpc_msg *))abort;
ops.xp_freeargs =
(bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort,
ops.xp_destroy = svc_vc_destroy;
ops2.xp_control = svc_vc_rendezvous_control;
}
xprt->xp_ops = &ops;
xprt->xp_ops2 = &ops2;
mutex_unlock(&ops_lock);
}
/*
* Get the effective UID of the sending process. Used by rpcbind, keyserv
* and rpc.yppasswdd on AF_LOCAL.
*/
int
__rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) {
int sock, ret;
gid_t egid;
uid_t euid;
struct sockaddr *sa;
sock = transp->xp_fd;
sa = (struct sockaddr *)transp->xp_rtaddr.buf;
if (sa->sa_family == AF_LOCAL) {
ret = getpeereid(sock, &euid, &egid);
if (ret == 0)
*uid = euid;
return (ret);
} else
return (-1);
}
/*
* Destroy xprts that have not have had any activity in 'timeout' seconds.
* If 'cleanblock' is true, blocking connections (the default) are also
* cleaned. If timeout is 0, the least active connection is picked.
*/
bool_t
__svc_clean_idle(fd_set *fds, int timeout, bool_t cleanblock)
{
int i, ncleaned;
SVCXPRT *xprt, *least_active;
struct timeval tv, tdiff, tmax;
struct cf_conn *cd;
gettimeofday(&tv, NULL);
tmax.tv_sec = tmax.tv_usec = 0;
least_active = NULL;
rwlock_wrlock(&svc_fd_lock);
for (i = ncleaned = 0; i <= svc_maxfd; i++) {
if (FD_ISSET(i, fds)) {
xprt = __svc_xports[i];
if (xprt == NULL || xprt->xp_ops == NULL ||
xprt->xp_ops->xp_recv != svc_vc_recv)
continue;
cd = (struct cf_conn *)xprt->xp_p1;
if (!cleanblock && !cd->nonblock)
continue;
if (timeout == 0) {
timersub(&tv, &cd->last_recv_time, &tdiff);
if (timercmp(&tdiff, &tmax, >)) {
tmax = tdiff;
least_active = xprt;
}
continue;
}
if (tv.tv_sec - cd->last_recv_time.tv_sec > timeout) {
__xprt_unregister_unlocked(xprt);
__svc_vc_dodestroy(xprt);
ncleaned++;
}
}
}
if (timeout == 0 && least_active != NULL) {
__xprt_unregister_unlocked(least_active);
__svc_vc_dodestroy(least_active);
ncleaned++;
}
rwlock_unlock(&svc_fd_lock);
return ncleaned > 0 ? TRUE : FALSE;
}