/* $XConsortium: connection.c,v 1.190 94/11/08 20:47:43 mor Exp $ */ /* $XFree86: xc/programs/Xserver/os/connection.c,v 3.6 1995/01/25 10:56:41 dawes Exp $ */ /*********************************************************** Copyright (c) 1987, 1989 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the X Consortium shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the X Consortium. Copyright 1987, 1989 by Digital Equipment Corporation, Maynard, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Digital not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /***************************************************************** * Stuff to create connections --- OS dependent * * EstablishNewConnections, CreateWellKnownSockets, ResetWellKnownSockets, * CloseDownConnection, CheckConnections, AddEnabledDevice, * RemoveEnabledDevice, OnlyListToOneClient, * ListenToAllClients, * * (WaitForSomething is in its own file) * * In this implementation, a client socket table is not kept. * Instead, what would be the index into the table is just the * file descriptor of the socket. This won't work for if the * socket ids aren't small nums (0 - 2^8) * *****************************************************************/ #include "X.h" #include "Xproto.h" #include #include #ifdef X_NOT_STDC_ENV extern int errno; #endif #ifndef MINIX #include #endif #include #include #ifdef hpux #include #include #endif #ifdef AIXV3 #include #endif #ifdef MINIX #include #define select(n,r,w,x,t) nbio_select(n,r,w,x,t) #endif #if defined(TCPCONN) || defined(STREAMSCONN) # include # ifndef hpux # ifdef apollo # ifndef NO_TCP_H # include # endif # else # include # endif # endif #endif #ifdef AMTCPCONN #include #include #include #endif #include #if !defined(AMOEBA) && !defined(_MINIX) #include #endif #include "misc.h" /* for typedef of pointer */ #include "osdep.h" #include "opaque.h" #include "dixstruct.h" #ifdef LBX #ifndef X_NOT_POSIX #include #else extern int read(), writev(); #endif #endif /* LBX */ #ifdef X_NOT_POSIX #define Pid_t int #else #define Pid_t pid_t #endif #ifdef DNETCONN #include #endif /* DNETCONN */ extern char *display; /* The display number */ int lastfdesc; /* maximum file descriptor */ FdMask WellKnownConnections; /* Listener mask */ FdSet EnabledDevices; /* mask for input devices that are on */ FdSet AllSockets; /* select on this */ FdSet AllClients; /* available clients */ FdSet LastSelectMask; /* mask returned from last select call */ FdSet ClientsWithInput; /* clients with FULL requests in buffer */ FdSet ClientsWriteBlocked; /* clients who cannot receive output */ FdSet OutputPending; /* clients with reply/event data ready to go */ int MaxClients = MAXSOCKS; long NConnBitArrays = mskcnt; Bool NewOutputPending; /* not yet attempted to write some new output */ Bool AnyClientsWriteBlocked; /* true if some client blocked on write */ Bool RunFromSmartParent; /* send SIGUSR1 to parent process */ Bool PartialNetwork; /* continue even if unable to bind all addrs */ static Pid_t ParentProcess; static Bool debug_conns = FALSE; FdSet IgnoredClientsWithInput; static FdSet GrabImperviousClients; static FdSet SavedAllClients; static FdSet SavedAllSockets; static FdSet SavedClientsWithInput; int GrabInProgress = 0; int ConnectionTranslation[MAXSOCKS]; #ifdef LBX int ConnectionOutputTranslation[MAXSOCKS]; #endif XtransConnInfo *ListenTransConns = NULL; int *ListenTransFds = NULL; int ListenTransCount; extern int auditTrailLevel; static void ErrorConnMax( #if NeedFunctionPrototypes XtransConnInfo /* trans_conn */ #endif ); #ifndef LBX static #endif void CloseDownFileDescriptor( #if NeedFunctionPrototypes #ifdef LBX ClientPtr client #else register OsCommPtr /*oc*/ #endif #endif ); static XtransConnInfo lookup_trans_conn (fd) int fd; { if (ListenTransFds) { int i; for (i = 0; i < ListenTransCount; i++) if (ListenTransFds[i] == fd) return ListenTransConns[i]; } return (NULL); } #ifdef XDMCP void XdmcpOpenDisplay(), XdmcpInit(), XdmcpReset(), XdmcpCloseDisplay(); #endif #if defined(LBX) || defined(LBX_COMPAT) extern int StandardReadRequestFromClient(); extern int StandardWriteToClient (); #endif #ifdef LBX extern int UncompressWriteToClient (); extern unsigned long StandardRequestLength (); extern int StandardFlushClient (); #endif /***************** * CreateWellKnownSockets * At initialization, create the sockets to listen on for new clients. *****************/ void CreateWellKnownSockets() { int request, i; int partial; char port[20]; CLEARBITS(AllSockets); CLEARBITS(AllClients); CLEARBITS(LastSelectMask); CLEARBITS(ClientsWithInput); for (i=0; i MAXSOCKS) { lastfdesc = MAXSOCKS; if (debug_conns) ErrorF( "GOT TO END OF SOCKETS %d\n", MAXSOCKS); } WellKnownConnections = 0; sprintf (port, "%d", atoi (display)); if ((_XSERVTransMakeAllCOTSServerListeners (port, &partial, &ListenTransCount, &ListenTransConns) >= 0) && (ListenTransCount >= 1)) { if (!PartialNetwork && partial) { FatalError ("Failed to establish all listening sockets"); } else { ListenTransFds = (int *) malloc (ListenTransCount * sizeof (int)); for (i = 0; i < ListenTransCount; i++) { int fd = _XSERVTransGetConnectionNumber (ListenTransConns[i]); ListenTransFds[i] = fd; WellKnownConnections |= (1L << fd); if (!_XSERVTransIsLocal (ListenTransConns[i])) { DefineSelf (fd); } } } } if (WellKnownConnections == 0) FatalError ("Cannot establish any listening sockets - Make sure an X server isn't already running"); OsSignal (SIGPIPE, SIG_IGN); OsSignal (SIGHUP, AutoResetServer); OsSignal (SIGINT, GiveUp); OsSignal (SIGTERM, GiveUp); AllSockets[0] = WellKnownConnections; ResetHosts(display); /* * Magic: If SIGUSR1 was set to SIG_IGN when * the server started, assume that either * * a- The parent process is ignoring SIGUSR1 * * or * * b- The parent process is expecting a SIGUSR1 * when the server is ready to accept connections * * In the first case, the signal will be harmless, * in the second case, the signal will be quite * useful */ if (OsSignal (SIGUSR1, SIG_IGN) == SIG_IGN) RunFromSmartParent = TRUE; ParentProcess = getppid (); if (RunFromSmartParent) { if (ParentProcess > 0) { kill (ParentProcess, SIGUSR1); } } #ifdef XDMCP XdmcpInit (); #endif } void ResetWellKnownSockets () { int i; ResetOsBuffers(); for (i = 0; i < ListenTransCount; i++) { int status = _XSERVTransResetListener (ListenTransConns[i]); if (status != TRANS_RESET_NOOP) { if (status == TRANS_RESET_FAILURE) { /* * ListenTransConns[i] freed by xtrans. * Remove it from out list. */ WellKnownConnections &= ~(1L << ListenTransFds[i]); ListenTransFds[i] = ListenTransFds[ListenTransCount - 1]; ListenTransConns[i] = ListenTransConns[ListenTransCount - 1]; ListenTransCount -= 1; i -= 1; } else if (status == TRANS_RESET_NEW_FD) { /* * A new file descriptor was allocated (the old one was closed) */ int newfd = _XSERVTransGetConnectionNumber (ListenTransConns[i]); WellKnownConnections &= ~(1L << ListenTransFds[i]); ListenTransFds[i] = newfd; WellKnownConnections |= (1L << newfd); } } } ResetAuthorization (); ResetHosts(display); /* * See above in CreateWellKnownSockets about SIGUSR1 */ if (RunFromSmartParent) { if (ParentProcess > 0) { kill (ParentProcess, SIGUSR1); } } /* * restart XDMCP */ #ifdef XDMCP XdmcpReset (); #endif } static void AuthAudit (client, letin, saddr, len, proto_n, auth_proto) int client; Bool letin; struct sockaddr *saddr; int len; unsigned short proto_n; char *auth_proto; { char addr[128]; if (!len) strcpy(addr, "local host"); else switch (saddr->sa_family) { case AF_UNSPEC: #ifdef UNIXCONN case AF_UNIX: #endif strcpy(addr, "local host"); break; #if defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN) case AF_INET: sprintf(addr, "IP %s port %d", inet_ntoa(((struct sockaddr_in *) saddr)->sin_addr), ((struct sockaddr_in *) saddr)->sin_port); break; #endif #ifdef DNETCONN case AF_DECnet: sprintf(addr, "DN %s", dnet_ntoa(&((struct sockaddr_dn *) saddr)->sdn_add)); break; #endif #ifdef AMRPCCONN case FamilyAmoeba: sprintf(addr, "AM %s", saddr); break; #endif #if defined(AMTCPCONN) && !(defined(TCPCONN) || defined(STREAMSCONN)) case AF_INET: sprintf(addr, "AMIP %s", inet_ntoa(*((ipaddr_t *) saddr))); break; #endif default: strcpy(addr, "unknown address"); } if (letin) AuditF("client %d connected from %s\n", client, addr); else AuditF("client %d rejected from %s\n", client, addr); if (proto_n) AuditF(" Auth name: %.*s\n", proto_n, auth_proto); } /***************************************************************** * ClientAuthorized * * Sent by the client at connection setup: * typedef struct _xConnClientPrefix { * CARD8 byteOrder; * BYTE pad; * CARD16 majorVersion, minorVersion; * CARD16 nbytesAuthProto; * CARD16 nbytesAuthString; * } xConnClientPrefix; * * It is hoped that eventually one protocol will be agreed upon. In the * mean time, a server that implements a different protocol than the * client expects, or a server that only implements the host-based * mechanism, will simply ignore this information. * *****************************************************************/ char * ClientAuthorized(client, proto_n, auth_proto, string_n, auth_string) ClientPtr client; char *auth_proto, *auth_string; unsigned int proto_n, string_n; { register OsCommPtr priv; Xtransaddr *from = NULL; int family; int fromlen; XID auth_id; char *reason = NULL; auth_id = CheckAuthorization (proto_n, auth_proto, string_n, auth_string, client, &reason); priv = (OsCommPtr)client->osPrivate; if (auth_id == (XID) ~0L) { if (_XSERVTransGetPeerAddr (priv->trans_conn, &family, &fromlen, &from) != -1) { #ifdef AMRPCCONN /* Amoeba RPC connections are already checked by the capability. */ if (family == FamilyAmoeba) { auth_id = (XID) 0; } else #endif if (InvalidHost ((struct sockaddr *) from, fromlen)) AuthAudit(client->index, FALSE, (struct sockaddr *) from, fromlen, proto_n, auth_proto); else { auth_id = (XID) 0; if (auditTrailLevel > 1) AuthAudit(client->index, TRUE, (struct sockaddr *) from, fromlen, proto_n, auth_proto); } free ((char *) from); } if (auth_id == (XID) ~0L) if (reason) return reason; else return "Client is not authorized to connect to Server"; } else if (auditTrailLevel > 1) { if (_XSERVTransGetPeerAddr (priv->trans_conn, &family, &fromlen, &from) != -1) { AuthAudit(client->index, TRUE, (struct sockaddr *) from, fromlen, proto_n, auth_proto); free ((char *) from); } } priv->auth_id = auth_id; priv->conn_time = 0; #ifdef XDMCP /* indicate to Xdmcp protocol that we've opened new client */ XdmcpOpenDisplay(priv->fd); #endif /* XDMCP */ /* At this point, if the client is authorized to change the access control * list, we should getpeername() information, and add the client to * the selfhosts list. It's not really the host machine, but the * true purpose of the selfhosts list is to see who may change the * access control list. */ return((char *)NULL); } #ifdef LBX XtransConnInfo ClientTransportObject(client) ClientPtr client; { OsCommPtr oc = (OsCommPtr) client->osPrivate; return oc->trans_conn; } int ClientConnectionNumber (client) ClientPtr client; { OsCommPtr oc = (OsCommPtr) client->osPrivate; return oc->fd; } AvailableClientInput (client) ClientPtr client; { OsCommPtr oc = (OsCommPtr)client->osPrivate; if (GETBIT(AllSockets, oc->fd)) BITSET(ClientsWithInput, oc->fd); } ClientPtr AllocNewConnection (trans_conn, fd, Read, Writev, Close) XtransConnInfo trans_conn; int fd; int (*Read)(); int (*Writev)(); void (*Close)(); { OsCommPtr oc; ClientPtr client; if (fd >= lastfdesc) return NullClient; oc = (OsCommPtr)xalloc(sizeof(OsCommRec)); if (!oc) return NullClient; oc->trans_conn = trans_conn; oc->fd = fd; oc->input = (ConnectionInputPtr)NULL; oc->output = (ConnectionOutputPtr)NULL; oc->conn_time = GetTimeInMillis(); oc->Read = Read; oc->Writev = Writev; oc->Close = Close; oc->flushClient = StandardFlushClient; oc->ofirst = (ConnectionOutputPtr) NULL; if (!(client = NextAvailableClient((pointer)oc))) { xfree (oc); return NullClient; } if (!ConnectionTranslation[fd]) { ConnectionTranslation[fd] = client->index; ConnectionOutputTranslation[fd] = client->index; if (GrabInProgress) { BITSET(SavedAllClients, fd); BITSET(SavedAllSockets, fd); } else { BITSET(AllClients, fd); BITSET(AllSockets, fd); } } client->public.readRequest = StandardReadRequestFromClient; client->public.writeToClient = StandardWriteToClient; client->public.uncompressedWriteToClient = UncompressWriteToClient; client->public.requestLength = StandardRequestLength; return client; } void SwitchConnectionFuncs (client, Read, Writev, Close) ClientPtr client; int (*Read)(); int (*Writev)(); void (*Close)(); { OsCommPtr oc = (OsCommPtr) client->osPrivate; oc->Read = Read; oc->Writev = Writev; oc->Close = Close; oc->conn_time = 0; } void StartOutputCompression(client, CompressOn, CompressOff) ClientPtr client; void (*CompressOn)(); void (*CompressOff)(); { OsCommPtr oc = (OsCommPtr) client->osPrivate; extern int LbxFlushClient(); oc->compressOn = CompressOn; oc->compressOff = CompressOff; oc->flushClient = LbxFlushClient; } #endif /***************** * EstablishNewConnections * If anyone is waiting on listened sockets, accept them. * Returns a mask with indices of new clients. Updates AllClients * and AllSockets. *****************/ /*ARGSUSED*/ Bool EstablishNewConnections(clientUnused, closure) ClientPtr clientUnused; pointer closure; { FdMask readyconnections; /* mask of listeners that are ready */ int curconn; /* fd of listener that's ready */ register int newconn; /* fd of new client */ CARD32 connect_time; register int i; register ClientPtr client; register OsCommPtr oc; #ifdef LBX extern int writev(), close(); #endif #ifndef AMOEBA readyconnections = (((FdMask)closure) & WellKnownConnections); if (!readyconnections) return TRUE; connect_time = GetTimeInMillis(); /* kill off stragglers */ for (i=1; iosPrivate); if (oc && (oc->conn_time != 0) && (connect_time - oc->conn_time) >= TimeOutValue) CloseDownClient(client); } } #else /* AMOEBA */ /* EstablishNewConnections is only called when there is one new * connection waiting on the first transport. */ readyconnections = 1; #endif /* AMOEBA */ while (readyconnections) { XtransConnInfo trans_conn, new_trans_conn; int status; curconn = ffs (readyconnections) - 1; readyconnections &= ~(1 << curconn); if ((trans_conn = lookup_trans_conn (curconn)) == NULL) continue; if ((new_trans_conn = _XSERVTransAccept (trans_conn, &status)) == NULL) continue; newconn = _XSERVTransGetConnectionNumber (new_trans_conn); _XSERVTransSetOption(new_trans_conn, TRANS_NONBLOCKING, 1); #ifdef LBX client = AllocNewConnection (new_trans_conn, newconn, read, writev, CloseDownFileDescriptor); if (!client) { ErrorConnMax(new_trans_conn); _XSERVTransClose(new_trans_conn); continue; } #else oc = (OsCommPtr)xalloc(sizeof(OsCommRec)); if (!oc) { ErrorConnMax(new_trans_conn); _XSERVTransClose(new_trans_conn); continue; } if (GrabInProgress) { BITSET(SavedAllClients, newconn); BITSET(SavedAllSockets, newconn); } else { BITSET(AllClients, newconn); BITSET(AllSockets, newconn); } oc->fd = newconn; oc->trans_conn = new_trans_conn; oc->input = (ConnectionInputPtr)NULL; oc->output = (ConnectionOutputPtr)NULL; oc->conn_time = connect_time; if ((newconn < lastfdesc) && (client = NextAvailableClient((pointer)oc))) { ConnectionTranslation[newconn] = client->index; #ifdef LBX_COMPAT client->public.readRequest = StandardReadRequestFromClient; client->public.writeToClient = StandardWriteToClient; #endif } else { ErrorConnMax(new_trans_conn); CloseDownFileDescriptor(oc); } #endif /* LBX */ } return TRUE; } #define NOROOM "Maximum number of clients reached" /************ * ErrorConnMax * Fail a connection due to lack of client or file descriptor space ************/ static void ErrorConnMax(trans_conn) XtransConnInfo trans_conn; { register int fd = _XSERVTransGetConnectionNumber (trans_conn); xConnSetupPrefix csp; char pad[3]; struct iovec iov[3]; char byteOrder = 0; int whichbyte = 1; #ifndef AMOEBA struct timeval waittime; FdSet mask; /* if these seems like a lot of trouble to go to, it probably is */ waittime.tv_sec = BOTIMEOUT / MILLI_PER_SECOND; waittime.tv_usec = (BOTIMEOUT % MILLI_PER_SECOND) * (1000000 / MILLI_PER_SECOND); CLEARBITS(mask); BITSET(mask, fd); (void)select(fd + 1, (int *) mask, (int *) NULL, (int *) NULL, &waittime); #endif /* try to read the byte-order of the connection */ (void)_XSERVTransRead(trans_conn, &byteOrder, 1); if ((byteOrder == 'l') || (byteOrder == 'B')) { csp.success = xFalse; csp.lengthReason = sizeof(NOROOM) - 1; csp.length = (sizeof(NOROOM) + 2) >> 2; csp.majorVersion = X_PROTOCOL; csp.minorVersion = X_PROTOCOL_REVISION; if (((*(char *) &whichbyte) && (byteOrder == 'B')) || (!(*(char *) &whichbyte) && (byteOrder == 'l'))) { swaps(&csp.majorVersion, whichbyte); swaps(&csp.minorVersion, whichbyte); swaps(&csp.length, whichbyte); } iov[0].iov_len = sz_xConnSetupPrefix; iov[0].iov_base = (char *) &csp; iov[1].iov_len = csp.lengthReason; iov[1].iov_base = NOROOM; iov[2].iov_len = (4 - (csp.lengthReason & 3)) & 3; iov[2].iov_base = pad; (void)_XSERVTransWritev(trans_conn, iov, 3); } } /************ * CloseDownFileDescriptor: * Remove this file descriptor and it's I/O buffers, etc. ************/ #ifdef LBX void CloseDownFileDescriptor(client) ClientPtr client; #else static void CloseDownFileDescriptor(oc) register OsCommPtr oc; #endif { #ifdef LBX register OsCommPtr oc = (OsCommPtr) client->osPrivate; #endif int connection = oc->fd; if (oc->trans_conn) _XSERVTransClose(oc->trans_conn); #ifdef LBX ConnectionTranslation[connection] = 0; ConnectionOutputTranslation[connection] = 0; #else FreeOsBuffers(oc); #endif BITCLEAR(AllSockets, connection); BITCLEAR(AllClients, connection); BITCLEAR(ClientsWithInput, connection); BITCLEAR(GrabImperviousClients, connection); if (GrabInProgress) { BITCLEAR(SavedAllSockets, connection); BITCLEAR(SavedAllClients, connection); BITCLEAR(SavedClientsWithInput, connection); } BITCLEAR(ClientsWriteBlocked, connection); if (!ANYSET(ClientsWriteBlocked)) AnyClientsWriteBlocked = FALSE; BITCLEAR(OutputPending, connection); #ifndef LBX xfree(oc); #endif } /***************** * CheckConections * Some connection has died, go find which one and shut it down * The file descriptor has been closed, but is still in AllClients. * If would truly be wonderful if select() would put the bogus * file descriptors in the exception mask, but nooooo. So we have * to check each and every socket individually. *****************/ void CheckConnections() { FdMask mask; FdSet tmask; register int curclient, curoff; int i; struct timeval notime; int r; #ifndef AMOEBA notime.tv_sec = 0; notime.tv_usec = 0; for (i=0; iosPrivate; if (oc->output && oc->output->count) FlushClient(client, oc, (char *)NULL, 0); ConnectionTranslation[oc->fd] = 0; #ifdef XDMCP XdmcpCloseDisplay(oc->fd); #endif #ifndef LBX CloseDownFileDescriptor(oc); #else (*oc->Close) (client); FreeOsBuffers(oc); xfree(oc); #endif client->osPrivate = (pointer)NULL; if (auditTrailLevel > 1) AuditF("client %d disconnected\n", client->index); } AddEnabledDevice(fd) int fd; { BITSET(EnabledDevices, fd); BITSET(AllSockets, fd); } RemoveEnabledDevice(fd) int fd; { BITCLEAR(EnabledDevices, fd); BITCLEAR(AllSockets, fd); } /***************** * OnlyListenToOneClient: * Only accept requests from one client. Continue to handle new * connections, but don't take any protocol requests from the new * ones. Note that if GrabInProgress is set, EstablishNewConnections * needs to put new clients into SavedAllSockets and SavedAllClients. * Note also that there is no timeout for this in the protocol. * This routine is "undone" by ListenToAllClients() *****************/ OnlyListenToOneClient(client) ClientPtr client; { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; if (! GrabInProgress) { COPYBITS(ClientsWithInput, SavedClientsWithInput); MASKANDSETBITS(ClientsWithInput, ClientsWithInput, GrabImperviousClients); if (GETBIT(SavedClientsWithInput, connection)) { BITCLEAR(SavedClientsWithInput, connection); BITSET(ClientsWithInput, connection); } UNSETBITS(SavedClientsWithInput, GrabImperviousClients); COPYBITS(AllSockets, SavedAllSockets); COPYBITS(AllClients, SavedAllClients); UNSETBITS(AllSockets, AllClients); MASKANDSETBITS(AllClients, AllClients, GrabImperviousClients); BITSET(AllClients, connection); ORBITS(AllSockets, AllSockets, AllClients); GrabInProgress = client->index; } } /**************** * ListenToAllClients: * Undoes OnlyListentToOneClient() ****************/ ListenToAllClients() { if (GrabInProgress) { ORBITS(AllSockets, AllSockets, SavedAllSockets); ORBITS(AllClients, AllClients, SavedAllClients); ORBITS(ClientsWithInput, ClientsWithInput, SavedClientsWithInput); GrabInProgress = 0; } } /**************** * IgnoreClient * Removes one client from input masks. * Must have cooresponding call to AttendClient. ****************/ IgnoreClient (client) ClientPtr client; { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; if (!GrabInProgress || GETBIT(AllClients, connection)) { if (GETBIT (ClientsWithInput, connection)) BITSET(IgnoredClientsWithInput, connection); else BITCLEAR(IgnoredClientsWithInput, connection); BITCLEAR(ClientsWithInput, connection); BITCLEAR(AllSockets, connection); BITCLEAR(AllClients, connection); BITCLEAR(LastSelectMask, connection); } else { if (GETBIT (SavedClientsWithInput, connection)) BITSET(IgnoredClientsWithInput, connection); else BITCLEAR(IgnoredClientsWithInput, connection); BITCLEAR(SavedClientsWithInput, connection); BITCLEAR(SavedAllSockets, connection); BITCLEAR(SavedAllClients, connection); } isItTimeToYield = TRUE; } /**************** * AttendClient * Adds one client back into the input masks. ****************/ AttendClient (client) ClientPtr client; { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; if (!GrabInProgress || GrabInProgress == client->index || GETBIT(GrabImperviousClients, connection)) { BITSET(AllClients, connection); BITSET(AllSockets, connection); BITSET(LastSelectMask, connection); if (GETBIT (IgnoredClientsWithInput, connection)) BITSET(ClientsWithInput, connection); } else { BITSET(SavedAllClients, connection); BITSET(SavedAllSockets, connection); if (GETBIT(IgnoredClientsWithInput, connection)) BITSET(SavedClientsWithInput, connection); } } /* make client impervious to grabs; assume only executing client calls this */ MakeClientGrabImpervious(client) ClientPtr client; { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; BITSET(GrabImperviousClients, connection); if (ServerGrabCallback) { ServerGrabInfoRec grabinfo; grabinfo.client = client; grabinfo.grabstate = CLIENT_IMPERVIOUS; CallCallbacks(&ServerGrabCallback, &grabinfo); } } /* make client pervious to grabs; assume only executing client calls this */ MakeClientGrabPervious(client) ClientPtr client; { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; BITCLEAR(GrabImperviousClients, connection); if (GrabInProgress && (GrabInProgress != client->index)) { if (GETBIT(ClientsWithInput, connection)) { BITSET(SavedClientsWithInput, connection); BITCLEAR(ClientsWithInput, connection); } BITCLEAR(AllSockets, connection); BITCLEAR(AllClients, connection); isItTimeToYield = TRUE; } if (ServerGrabCallback) { ServerGrabInfoRec grabinfo; grabinfo.client = client; grabinfo.grabstate = CLIENT_PERVIOUS; CallCallbacks(&ServerGrabCallback, &grabinfo); } } #ifdef AIXV3 static FdSet pendingActiveClients; static BOOL reallyGrabbed; /**************** * DontListenToAnybody: * Don't listen to requests from any clients. Continue to handle new * connections, but don't take any protocol requests from anybody. * We have to take care if there is already a grab in progress, though. * Undone by PayAttentionToClientsAgain. We also have to be careful * not to accept any more input from the currently dispatched client. * we do this be telling dispatch it is time to yield. * We call this when the server loses access to the glass * (user hot-keys away). This looks like a grab by the * server itself, but gets a little tricky if there is already * a grab in progress. ******************/ void DontListenToAnybody() { if (!GrabInProgress) { COPYBITS(ClientsWithInput, SavedClientsWithInput); COPYBITS(AllSockets, SavedAllSockets); COPYBITS(AllClients, SavedAllClients); GrabInProgress = TRUE; reallyGrabbed = FALSE; } else { COPYBITS(AllClients, pendingActiveClients); reallyGrabbed = TRUE; } CLEARBITS(ClientsWithInput); UNSETBITS(AllSockets, AllClients); CLEARBITS(AllClients); isItTimeToYield = TRUE; } void PayAttentionToClientsAgain() { if (reallyGrabbed) { ORBITS(AllSockets, AllSockets, pendingActiveClients); ORBITS(AllClients, AllClients, pendingActiveClients); } else { ListenToAllClients(); } reallyGrabbed = FALSE; } #endif