231 lines
6.3 KiB
C
231 lines
6.3 KiB
C
/* $XFree86$ */
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/*
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* Copyright 2002-2003 Red Hat Inc., Durham, North Carolina.
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*
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation on the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* 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
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* SOFTWARE.
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*/
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/*
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* Authors:
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* Rickard E. (Rik) Faith <faith@redhat.com>
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*
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*/
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/** \file
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*
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* Provides an interface for handling SIGIO signals for input devices. */
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#include "inputstr.h"
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#include "dmxinputinit.h"
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#include "dmxsigio.h"
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#include "dmxevents.h"
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#include <signal.h>
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#include <unistd.h>
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#include <fcntl.h>
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static int dmxFdCount = 0;
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static Bool dmxInputEnabled = TRUE;
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/* Define equivalents for non-POSIX systems (e.g., SGI IRIX, Solaris) */
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#ifndef O_ASYNC
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# ifdef FASYNC
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# define O_ASYNC FASYNC
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# else
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# define O_ASYNC 0
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# endif
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#endif
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#ifndef O_NONBLOCK
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#define O_NONBLOCK FNONBLK
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#endif
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static void dmxSigioHandler(int sig)
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{
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int i, j;
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DMXInputInfo *dmxInput;
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for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++) {
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if (dmxInput->sigioState == DMX_ACTIVESIGIO) {
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for (j = 0; j < dmxInput->numDevs; j++) {
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DMXLocalInputInfoPtr dmxLocal = dmxInput->devs[j];
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if (dmxLocal->collect_events) {
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dmxLocal->collect_events(&dmxLocal->pDevice->public,
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dmxMotion,
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dmxEnqueue,
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dmxCheckSpecialKeys,
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DMX_NO_BLOCK);
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}
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}
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}
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}
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}
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/** Block SIGIO handling. */
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void dmxSigioBlock(void)
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{
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sigset_t s;
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sigemptyset(&s);
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sigaddset(&s, SIGIO);
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sigprocmask(SIG_BLOCK, &s, 0);
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}
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/** Unblock SIGIO handling. */
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void dmxSigioUnblock(void)
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{
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sigset_t s;
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sigemptyset(&s);
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sigaddset(&s, SIGIO);
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sigprocmask(SIG_UNBLOCK, &s, 0);
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}
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static void dmxSigioHook(void)
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{
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struct sigaction a;
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sigset_t s;
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memset(&a, 0, sizeof(a));
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a.sa_handler = dmxSigioHandler;
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sigemptyset(&a.sa_mask);
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sigaddset(&a.sa_mask, SIGIO);
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sigaddset(&a.sa_mask, SIGALRM);
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sigaddset(&a.sa_mask, SIGVTALRM);
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sigaction(SIGIO, &a, 0);
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sigemptyset(&s);
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sigprocmask(SIG_SETMASK, &s, 0);
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}
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static void dmxSigioUnhook(void)
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{
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struct sigaction a;
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memset (&a, 0, sizeof(a));
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a.sa_handler = SIG_IGN;
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sigemptyset(&a.sa_mask);
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sigaction(SIGIO, &a, 0);
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}
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static void dmxSigioAdd(DMXInputInfo *dmxInput)
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{
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int flags;
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int i;
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switch (dmxInput->sigioState) {
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case DMX_NOSIGIO: return;
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case DMX_USESIGIO: dmxInput->sigioState = DMX_ACTIVESIGIO; break;
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case DMX_ACTIVESIGIO: return;
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}
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for (i = 0; i < dmxInput->sigioFdCount; i++) {
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if (!dmxInput->sigioAdded[i]) {
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int fd = dmxInput->sigioFd[i];
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fcntl(fd, F_SETOWN, getpid());
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flags = fcntl(fd, F_GETFL);
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flags |= O_ASYNC|O_NONBLOCK;
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fcntl(fd, F_SETFL, flags);
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AddEnabledDevice(fd);
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dmxInput->sigioAdded[i] = TRUE;
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if (++dmxFdCount == 1) dmxSigioHook();
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}
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}
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}
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static void dmxSigioRemove(DMXInputInfo *dmxInput)
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{
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int flags;
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int i;
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switch (dmxInput->sigioState) {
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case DMX_NOSIGIO: return;
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case DMX_USESIGIO: return;
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case DMX_ACTIVESIGIO: dmxInput->sigioState = DMX_USESIGIO; break;
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}
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for (i = 0; i < dmxInput->sigioFdCount; i++) {
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if (dmxInput->sigioAdded[i]) {
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int fd = dmxInput->sigioFd[i];
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dmxInput->sigioAdded[i] = FALSE;
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RemoveEnabledDevice(fd);
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flags = fcntl(fd, F_GETFL);
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flags &= ~(O_ASYNC|O_NONBLOCK);
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fcntl(fd, F_SETFL, flags);
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if (!--dmxFdCount) dmxSigioUnhook();
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}
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}
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}
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/** Enable SIGIO handling. This instantiates the handler with the OS. */
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void dmxSigioEnableInput(void)
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{
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int i;
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DMXInputInfo *dmxInput;
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dmxInputEnabled = TRUE;
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for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++)
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dmxSigioAdd(dmxInput);
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}
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/** Disable SIGIO handling. This removes the hanlder from the OS. */
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void dmxSigioDisableInput(void)
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{
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int i;
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DMXInputInfo *dmxInput;
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dmxInputEnabled = FALSE;
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for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++)
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dmxSigioRemove(dmxInput);
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}
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/** Make a note that the input device described in \a dmxInput will be
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* using the file descriptor \a fd for SIGIO signals. Calls
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* AddEnabledDevice ifi SIGIO handling has been enabled with
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* #dmxSigioEnableInput(). */
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void dmxSigioRegister(DMXInputInfo *dmxInput, int fd)
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{
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dmxInput->sigioState = DMX_USESIGIO;
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if (dmxInput->sigioFdCount >= DMX_MAX_SIGIO_FDS)
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dmxLog(dmxFatal, "Too many SIGIO file descriptors (%d >= %d)\n",
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dmxInput->sigioFdCount, DMX_MAX_SIGIO_FDS);
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dmxInput->sigioFd[dmxInput->sigioFdCount++] = fd;
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if (dmxInputEnabled) dmxSigioAdd(dmxInput);
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}
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/** Remove the notes that \a dmxInput is using any file descriptors for
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* SIGIO signals. Calls RemoveEnabledDevice. */
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void dmxSigioUnregister(DMXInputInfo *dmxInput)
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{
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if (dmxInput->sigioState == DMX_NOSIGIO) return;
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dmxSigioRemove(dmxInput);
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dmxInput->sigioState = DMX_NOSIGIO;
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dmxInput->sigioFdCount = 0;
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}
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