707 lines
18 KiB
C
707 lines
18 KiB
C
/* $Xorg: io.c,v 1.5 2001/02/09 02:05:44 xorgcvs Exp $ */
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/*
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* i/o functions
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*/
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/*
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Copyright 1990, 1991, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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* Copyright 1990, 1991 Network Computing Devices;
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* Portions Copyright 1987 by Digital Equipment Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the names of Network Computing Devices, or Digital
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* not be used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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*
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* NETWORK COMPUTING DEVICES, AND DIGITAL DISCLAIM ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES,
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* OR DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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* THIS SOFTWARE.
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*/
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/* $XFree86: xc/programs/xfs/os/io.c,v 3.18 2001/12/14 20:01:41 dawes Exp $ */
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#include <X11/Xtrans/Xtrans.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#ifndef Lynx
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#include <sys/param.h>
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#ifndef __UNIXOS2__
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#include <sys/uio.h>
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#endif
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#else
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#include <uio.h>
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#endif
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#include <X11/fonts/FSproto.h>
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#include "clientstr.h"
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#include "X11/Xpoll.h"
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#include "osdep.h"
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#include "globals.h"
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#include "dispatch.h"
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/* check for both EAGAIN and EWOULDBLOCK, because some supposedly POSIX
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* systems are broken and return EWOULDBLOCK when they should return EAGAIN
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*/
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#if defined(EAGAIN) && defined(EWOULDBLOCK)
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#define ETEST(err) (err == EAGAIN || err == EWOULDBLOCK)
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#else
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#ifdef EAGAIN
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#define ETEST(err) (err == EAGAIN)
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#else
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#define ETEST(err) (err == EWOULDBLOCK)
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#endif
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#endif
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extern fd_set ClientsWithInput;
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extern fd_set ClientsWriteBlocked;
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extern fd_set OutputPending;
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extern long OutputBufferSize;
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extern int ConnectionTranslation[];
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extern Bool AnyClientsWriteBlocked;
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extern Bool NewOutputPending;
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static int timesThisConnection = 0;
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static ConnectionInputPtr FreeInputs = (ConnectionInputPtr) NULL;
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static ConnectionOutputPtr FreeOutputs = (ConnectionOutputPtr) NULL;
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static OsCommPtr AvailableInput = (OsCommPtr) NULL;
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static ConnectionInputPtr AllocateInputBuffer(void);
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static ConnectionOutputPtr AllocateOutputBuffer(void);
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#define MAX_TIMES_PER 10
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#define yield_control() \
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{ isItTimeToYield = TRUE; \
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timesThisConnection = 0; }
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#define yield_control_no_input() \
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{ yield_control(); \
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FD_CLR(fd, &ClientsWithInput); }
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#define yield_control_death() \
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{ timesThisConnection = 0; }
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#define request_length(req, client) \
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((int)((client)->swapped ? lswaps((req)->length) : (req)->length) << 2)
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int
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ReadRequest(ClientPtr client)
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{
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OsCommPtr oc;
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ConnectionInputPtr oci;
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fsReq *request;
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int fd,
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result,
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gotnow,
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needed = 0;
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if (client == NULL)
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return -1;
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oc = (OsCommPtr) client->osPrivate;
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if (oc == NULL)
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return -1;
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oci = oc->input;
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fd = oc->fd;
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if (oci != NULL && fd < 0)
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return -1;
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if (AvailableInput) {
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if (AvailableInput != oc) {
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ConnectionInputPtr aci = AvailableInput->input;
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if (aci->size > BUFWATERMARK) {
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fsfree(aci->buffer);
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fsfree(aci);
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} else {
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aci->next = FreeInputs;
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FreeInputs = aci;
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}
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AvailableInput->input = (ConnectionInputPtr) NULL;
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}
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AvailableInput = (OsCommPtr) NULL;
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}
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if (!oci) {
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if ((oci = FreeInputs ) != (ConnectionInputPtr) 0) {
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FreeInputs = oci->next;
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} else if (!(oci = AllocateInputBuffer())) {
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yield_control_death();
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return -1;
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}
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oc->input = oci;
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}
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oci->bufptr += oci->lenLastReq;
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gotnow = oci->bufcnt + oci->buffer - oci->bufptr;
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#ifdef WORD64
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/* need 8-byte alignment */
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if ((oci->bufptr - oci->buffer) & 7 && gotnow > 0)
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{
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memmove( oci->buffer, oci->bufptr, gotnow);
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oci->bufptr = oci->buffer;
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oci->bufcnt = gotnow;
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}
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#endif
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request = (fsReq *) oci->bufptr;
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/* not enough for a request */
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if ((gotnow < SIZEOF(fsReq)) ||
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(gotnow < (needed = request_length(request, client)))) {
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oci->lenLastReq = 0;
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if ((gotnow < SIZEOF(fsReq)) || needed == 0)
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needed = SIZEOF(fsReq);
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else if (needed > MAXBUFSIZE) {
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yield_control_death();
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return -1;
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}
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/* see if we need to shift up a partial request so the rest can fit */
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if ((gotnow == 0) ||
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((oci->bufptr - oci->buffer + needed) > oci->size))
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{
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if ((gotnow > 0) && (oci->bufptr != oci->buffer))
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memmove( oci->buffer, oci->bufptr, gotnow);
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/* grow buffer if necessary */
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if (needed > oci->size) {
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char *ibuf;
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ibuf = (char *) fsrealloc(oci->buffer, needed);
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if (!ibuf) {
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yield_control_death();
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return -1;
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}
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oci->size = needed;
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oci->buffer = ibuf;
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}
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oci->bufptr = oci->buffer;
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oci->bufcnt = gotnow;
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}
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/* fill 'er up */
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if (oc->trans_conn == NULL) {
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yield_control_death();
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return -1;
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}
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result = _FontTransRead(oc->trans_conn, oci->buffer + oci->bufcnt,
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oci->size - oci->bufcnt);
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if (result <= 0) {
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#if !(defined(SVR4) && defined(i386) && !defined(sun))
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if ((result < 0) && ETEST(errno)) {
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yield_control_no_input();
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return 0;
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} else
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#endif
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{
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yield_control_death();
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return -1;
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}
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}
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oci->bufcnt += result;
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gotnow += result;
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/* free up space after huge requests */
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if ((oci->size > BUFWATERMARK) &&
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(oci->bufcnt < BUFSIZE) && (needed < BUFSIZE)) {
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char *ibuf;
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ibuf = (char *) fsrealloc(oci->buffer, BUFSIZE);
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if (ibuf) {
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oci->size = BUFSIZE;
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oci->buffer = ibuf;
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oci->bufptr = ibuf + oci->bufcnt - gotnow;
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}
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}
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request = (fsReq *) oci->bufptr;
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if ((gotnow < SIZEOF(fsReq)) ||
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(gotnow < (needed = request_length(request, client)))) {
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yield_control_no_input();
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return 0;
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}
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}
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if (needed == 0)
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needed = SIZEOF(fsReq);
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oci->lenLastReq = needed;
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/*
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* Check to see if client has at least one whole request in the buffer. If
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* there is only a partial request, treat like buffer is empty so that
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* select() will be called again and other clients can get into the queue.
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*/
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if (gotnow >= needed + SIZEOF(fsReq)) {
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request = (fsReq *) (oci->bufptr + needed);
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if (gotnow >= needed + request_length(request, client))
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FD_SET(fd, &ClientsWithInput);
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else
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yield_control_no_input();
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} else {
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if (gotnow == needed)
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AvailableInput = oc;
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yield_control_no_input();
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}
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if (++timesThisConnection >= MAX_TIMES_PER)
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yield_control();
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client->requestBuffer = (pointer) oci->bufptr;
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return needed;
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}
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Bool
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InsertFakeRequest(ClientPtr client, char *data, int count)
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{
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OsCommPtr oc = (OsCommPtr) client->osPrivate;
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ConnectionInputPtr oci = oc->input;
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int fd = oc->fd;
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fsReq *request;
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int gotnow,
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moveup;
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if (AvailableInput) {
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if (AvailableInput != oc) {
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register ConnectionInputPtr aci = AvailableInput->input;
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if (aci->size > BUFWATERMARK) {
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fsfree(aci->buffer);
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fsfree(aci);
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} else {
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aci->next = FreeInputs;
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FreeInputs = aci;
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}
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AvailableInput->input = (ConnectionInputPtr) NULL;
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}
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AvailableInput = (OsCommPtr) NULL;
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}
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if (!oci) {
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if ((oci = FreeInputs) != (ConnectionInputPtr) 0)
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FreeInputs = oci->next;
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else if (!(oci = AllocateInputBuffer()))
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return FALSE;
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oc->input = oci;
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}
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oci->bufptr += oci->lenLastReq;
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oci->lenLastReq = 0;
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gotnow = oci->bufcnt + oci->buffer - oci->bufptr;
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if ((gotnow + count) > oci->size) {
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char *ibuf;
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ibuf = (char *) fsrealloc(oci->buffer, gotnow + count);
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if (!ibuf)
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return FALSE;
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oci->size = gotnow + count;
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oci->buffer = ibuf;
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oci->bufptr = ibuf + oci->bufcnt - gotnow;
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}
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moveup = count - (oci->bufptr - oci->buffer);
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if (moveup > 0) {
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if (gotnow > 0)
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memmove( oci->bufptr + moveup, oci->bufptr, gotnow);
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oci->bufptr += moveup;
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oci->bufcnt += moveup;
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}
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memmove( oci->bufptr - count, data, count);
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oci->bufptr -= count;
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request = (fsReq *) oci->bufptr;
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gotnow += count;
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if ((gotnow >= SIZEOF(fsReq)) &&
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(gotnow >= request_length(request, client)))
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FD_SET(fd, &ClientsWithInput);
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else
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yield_control_no_input();
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return TRUE;
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}
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void
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ResetCurrentRequest(ClientPtr client)
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{
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OsCommPtr oc = (OsCommPtr) client->osPrivate;
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ConnectionInputPtr oci = oc->input;
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int fd = oc->fd;
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fsReq *request;
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int gotnow;
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if (AvailableInput == oc)
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AvailableInput = (OsCommPtr) NULL;
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oci->lenLastReq = 0;
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request = (fsReq *) oci->bufptr;
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gotnow = oci->bufcnt + oci->buffer - oci->bufptr;
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if ((gotnow >= SIZEOF(fsReq)) &&
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(gotnow >= request_length(request, client))) {
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FD_SET(fd, &ClientsWithInput);
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yield_control();
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} else {
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yield_control_no_input();
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}
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}
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int
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FlushClient(
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ClientPtr client,
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OsCommPtr oc,
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char *extraBuf,
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int extraCount,
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int padsize)
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{
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ConnectionOutputPtr oco = oc->output;
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int fd = oc->fd;
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struct iovec iov[3];
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char padBuffer[3];
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long written;
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long notWritten;
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long todo;
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if (!oco)
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return 0;
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written = 0;
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notWritten = oco->count + extraCount + padsize;
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todo = notWritten;
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while (notWritten) {
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long before = written;
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long remain = todo;
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int i = 0;
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long len;
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/*-
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* You could be very general here and have "in" and "out" iovecs and
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* write a loop without using a macro, but what the heck. This
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* translates to:
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*
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* how much of this piece is new?
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* if more new then we are trying this time, clamp
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* if nothing new
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* then bump down amount already written, for next piece
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* else put new stuff in iovec, will need all of next piece
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*
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* Note that todo had better be at least 1 or else we'll end up
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* writing 0 iovecs.
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*/
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#define InsertIOV(pointer, length) \
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len = (length) - before; \
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if (len > remain) \
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len = remain; \
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if (len <= 0) { \
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before = (-len); \
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} else { \
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iov[i].iov_len = len; \
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iov[i].iov_base = (pointer) + before; \
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i++; \
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remain -= len; \
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before = 0; \
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}
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InsertIOV((char *) oco->buf, oco->count);
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InsertIOV(extraBuf, extraCount);
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InsertIOV(padBuffer, padsize);
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errno = 0;
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if (oc->trans_conn && (len = _FontTransWritev(oc->trans_conn, iov, i)) >= 0) {
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written += len;
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notWritten -= len;
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todo = notWritten;
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} else if (ETEST(errno)
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#ifdef SUNSYSV /* check for another brain-damaged OS bug */
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|| (errno == 0)
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#endif
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#ifdef EMSGSIZE /* check for another brain-damaged OS bug */
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|| ((errno == EMSGSIZE) && (todo == 1))
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#endif
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)
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{
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FD_SET(fd, &ClientsWriteBlocked);
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AnyClientsWriteBlocked = TRUE;
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if (written < oco->count) {
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if (written > 0) {
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oco->count -= written;
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memmove( (char *) oco->buf, (char *) oco->buf + written,
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oco->count);
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written = 0;
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}
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} else {
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written -= oco->count;
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oco->count = 0;
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}
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/* grow buffer if necessary */
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if (notWritten > oco->size) {
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unsigned char *obuf;
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obuf = (unsigned char *) fsrealloc(oco->buf,
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notWritten + OutputBufferSize);
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if (!obuf) {
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if (oc->trans_conn)
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_FontTransClose(oc->trans_conn);
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oc->trans_conn = NULL;
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MarkClientException(client);
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oco->count = 0;
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return -1;
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}
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oco->size = notWritten + OutputBufferSize;
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oco->buf = obuf;
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}
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if ((len = extraCount - written) > 0) {
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memmove( (char *) oco->buf + oco->count,
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extraBuf + written, len);
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}
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oco->count = notWritten;
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return extraCount;
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}
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#ifdef EMSGSIZE /* check for another brain-damaged OS bug */
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else if (errno == EMSGSIZE)
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{
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todo >>= 1;
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}
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#endif
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else
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{
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if (oc->trans_conn)
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_FontTransClose(oc->trans_conn);
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oc->trans_conn = NULL;
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MarkClientException(client);
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oco->count = 0;
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return -1;
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}
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}
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/* everything was flushed */
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oco->count = 0;
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/* clear the write block if it was set */
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if (AnyClientsWriteBlocked) {
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FD_CLR(fd, &ClientsWriteBlocked);
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if (!XFD_ANYSET(&ClientsWriteBlocked))
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AnyClientsWriteBlocked = FALSE;
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}
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if (oco->size > BUFWATERMARK) {
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fsfree(oco->buf);
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fsfree(oco);
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} else {
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oco->next = FreeOutputs;
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FreeOutputs = oco;
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}
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oc->output = (ConnectionOutputPtr) NULL;
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return extraCount;
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}
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void
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FlushAllOutput(void)
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{
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int index, base;
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fd_mask mask;
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OsCommPtr oc;
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ClientPtr client;
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if (!NewOutputPending)
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return;
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NewOutputPending = FALSE;
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for (base = 0; base < howmany(XFD_SETSIZE, NFDBITS); base++) {
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mask = OutputPending.fds_bits[base];
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OutputPending.fds_bits[base] = 0;
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while (mask) {
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index = ffs(mask) - 1;
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mask &= ~lowbit(mask);
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if ((index = ConnectionTranslation[(base << 5) + index]) == 0)
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continue;
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client = clients[index];
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if (client->clientGone == CLIENT_GONE)
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continue;
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oc = (OsCommPtr) client->osPrivate;
|
|
if (FD_ISSET(oc->fd, &ClientsWithInput)) {
|
|
FD_SET(oc->fd, &OutputPending);
|
|
NewOutputPending = TRUE;
|
|
} else {
|
|
(void) FlushClient(client, oc, (char *) NULL, 0, 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* returns number of bytes written
|
|
*/
|
|
static int
|
|
write_to_client_internal(ClientPtr client, int count, char *buf, int padBytes)
|
|
{
|
|
OsCommPtr oc = (OsCommPtr) client->osPrivate;
|
|
ConnectionOutputPtr oco = oc->output;
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
if (!oco) {
|
|
if ((oco = FreeOutputs) != (ConnectionOutputPtr) 0) {
|
|
FreeOutputs = oco->next;
|
|
} else if (!(oco = AllocateOutputBuffer())) {
|
|
_FontTransClose(oc->trans_conn);
|
|
oc->trans_conn = NULL;
|
|
MarkClientException(client);
|
|
return -1;
|
|
}
|
|
oc->output = oco;
|
|
}
|
|
if (oco->count + count + padBytes > oco->size) {
|
|
FD_CLR(oc->fd, &OutputPending);
|
|
NewOutputPending = FALSE;
|
|
return FlushClient(client, oc, buf, count, padBytes);
|
|
}
|
|
NewOutputPending = TRUE;
|
|
FD_SET(oc->fd, &OutputPending);
|
|
memmove( (char *) oco->buf + oco->count, buf, count);
|
|
oco->count += count + padBytes;
|
|
|
|
return count;
|
|
}
|
|
|
|
void
|
|
WriteToClientUnpadded(ClientPtr client, int count, char *buf)
|
|
{
|
|
write_to_client_internal(client, count, buf, 0);
|
|
}
|
|
|
|
static int padlength[4] = {0, 3, 2, 1};
|
|
|
|
void
|
|
WriteToClient(ClientPtr client, int count, char *buf)
|
|
{
|
|
int flag = 0;
|
|
if (NULL == buf) {
|
|
flag = -1;
|
|
buf = (char *)fsalloc(count); memset(buf, 0, count);
|
|
}
|
|
write_to_client_internal(client, count, buf, padlength[count & 3]);
|
|
if (flag)
|
|
fsfree(buf);
|
|
}
|
|
|
|
static ConnectionInputPtr
|
|
AllocateInputBuffer(void)
|
|
{
|
|
register ConnectionInputPtr oci;
|
|
|
|
oci = (ConnectionInputPtr) fsalloc(sizeof(ConnectionInput));
|
|
if (!oci)
|
|
return (ConnectionInputPtr) NULL;
|
|
oci->buffer = (char *) fsalloc(BUFSIZE);
|
|
if (!oci->buffer) {
|
|
fsfree(oci);
|
|
return (ConnectionInputPtr) NULL;
|
|
}
|
|
oci->next = 0;
|
|
oci->size = BUFSIZE;
|
|
oci->bufptr = oci->buffer;
|
|
oci->bufcnt = 0;
|
|
oci->lenLastReq = 0;
|
|
return oci;
|
|
}
|
|
|
|
static ConnectionOutputPtr
|
|
AllocateOutputBuffer(void)
|
|
{
|
|
register ConnectionOutputPtr oco;
|
|
|
|
oco = (ConnectionOutputPtr) fsalloc(sizeof(ConnectionOutput));
|
|
if (!oco)
|
|
return (ConnectionOutputPtr) NULL;
|
|
oco->buf = (unsigned char *) fsalloc(BUFSIZE);
|
|
if (!oco->buf) {
|
|
fsfree(oco);
|
|
return (ConnectionOutputPtr) NULL;
|
|
}
|
|
oco->size = BUFSIZE;
|
|
oco->count = 0;
|
|
return oco;
|
|
}
|
|
|
|
|
|
void
|
|
FreeOsBuffers(OsCommPtr oc)
|
|
{
|
|
register ConnectionInputPtr oci;
|
|
register ConnectionOutputPtr oco;
|
|
|
|
if (AvailableInput == oc)
|
|
AvailableInput = (OsCommPtr) NULL;
|
|
if ((oci = oc->input) != (ConnectionInputPtr) 0) {
|
|
if (FreeInputs) {
|
|
fsfree(oci->buffer);
|
|
fsfree(oci);
|
|
} else {
|
|
FreeInputs = oci;
|
|
oci->next = (ConnectionInputPtr) NULL;
|
|
oci->bufptr = oci->buffer;
|
|
oci->bufcnt = 0;
|
|
oci->lenLastReq = 0;
|
|
}
|
|
}
|
|
if ((oco = oc->output) != (ConnectionOutputPtr) 0) {
|
|
if (FreeOutputs) {
|
|
fsfree(oco->buf);
|
|
fsfree(oco);
|
|
} else {
|
|
FreeOutputs = oco;
|
|
oco->next = (ConnectionOutputPtr) NULL;
|
|
oco->count = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
ResetOsBuffers(void)
|
|
{
|
|
register ConnectionInputPtr oci;
|
|
register ConnectionOutputPtr oco;
|
|
|
|
while ((oci = FreeInputs) != (ConnectionInputPtr) 0) {
|
|
FreeInputs = oci->next;
|
|
fsfree(oci->buffer);
|
|
fsfree(oci);
|
|
}
|
|
while ((oco = FreeOutputs) != (ConnectionOutputPtr) 0) {
|
|
FreeOutputs = oco->next;
|
|
fsfree(oco->buf);
|
|
fsfree(oco);
|
|
}
|
|
}
|