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-rw-r--r--xorg-server/hw/dmx/input/dmxsigio.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/xorg-server/hw/dmx/input/dmxsigio.c b/xorg-server/hw/dmx/input/dmxsigio.c
new file mode 100644
index 000000000..03c3070d7
--- /dev/null
+++ b/xorg-server/hw/dmx/input/dmxsigio.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright 2002-2003 Red Hat Inc., Durham, North Carolina.
+ *
+ * All Rights Reserved.
+ *
+ * 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 on 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 (including the
+ * next paragraph) 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
+ * NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
+ * 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.
+ */
+
+/*
+ * Authors:
+ * Rickard E. (Rik) Faith <faith@redhat.com>
+ *
+ */
+
+/** \file
+ *
+ * Provides an interface for handling SIGIO signals for input devices. */
+
+#ifdef HAVE_DMX_CONFIG_H
+#include <dmx-config.h>
+#endif
+
+#include "inputstr.h"
+#include "dmxinputinit.h"
+#include "dmxsigio.h"
+#include "dmxevents.h"
+#include <signal.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+static int dmxFdCount = 0;
+static Bool dmxInputEnabled = TRUE;
+
+/* Define equivalents for non-POSIX systems (e.g., SGI IRIX, Solaris) */
+#ifndef O_ASYNC
+# ifdef FASYNC
+# define O_ASYNC FASYNC
+# else
+# define O_ASYNC 0
+# endif
+#endif
+#ifndef O_NONBLOCK
+#define O_NONBLOCK FNONBLK
+#endif
+
+static void dmxSigioHandler(int sig)
+{
+ int i, j;
+ DMXInputInfo *dmxInput;
+
+ for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++) {
+ if (dmxInput->sigioState == DMX_ACTIVESIGIO) {
+ for (j = 0; j < dmxInput->numDevs; j++) {
+ DMXLocalInputInfoPtr dmxLocal = dmxInput->devs[j];
+ if (dmxLocal->collect_events) {
+ dmxLocal->collect_events(&dmxLocal->pDevice->public,
+ dmxMotion,
+ dmxEnqueue,
+ dmxCheckSpecialKeys,
+ DMX_NO_BLOCK);
+ }
+ }
+ }
+ }
+}
+
+/** Block SIGIO handling. */
+void dmxSigioBlock(void)
+{
+ sigset_t s;
+
+ sigemptyset(&s);
+ sigaddset(&s, SIGIO);
+ sigprocmask(SIG_BLOCK, &s, 0);
+}
+
+/** Unblock SIGIO handling. */
+void dmxSigioUnblock(void)
+{
+ sigset_t s;
+
+ sigemptyset(&s);
+ sigaddset(&s, SIGIO);
+ sigprocmask(SIG_UNBLOCK, &s, 0);
+}
+
+static void dmxSigioHook(void)
+{
+ struct sigaction a;
+ sigset_t s;
+
+ memset(&a, 0, sizeof(a));
+ a.sa_handler = dmxSigioHandler;
+ sigemptyset(&a.sa_mask);
+ sigaddset(&a.sa_mask, SIGIO);
+ sigaddset(&a.sa_mask, SIGALRM);
+ sigaddset(&a.sa_mask, SIGVTALRM);
+ sigaction(SIGIO, &a, 0);
+
+ sigemptyset(&s);
+ sigprocmask(SIG_SETMASK, &s, 0);
+}
+
+static void dmxSigioUnhook(void)
+{
+ struct sigaction a;
+
+ memset (&a, 0, sizeof(a));
+ a.sa_handler = SIG_IGN;
+ sigemptyset(&a.sa_mask);
+ sigaction(SIGIO, &a, 0);
+}
+
+static void dmxSigioAdd(DMXInputInfo *dmxInput)
+{
+ int flags;
+ int i;
+
+ switch (dmxInput->sigioState) {
+ case DMX_NOSIGIO: return;
+ case DMX_USESIGIO: dmxInput->sigioState = DMX_ACTIVESIGIO; break;
+ case DMX_ACTIVESIGIO: return;
+ }
+
+ for (i = 0; i < dmxInput->sigioFdCount; i++) {
+ if (!dmxInput->sigioAdded[i]) {
+ int fd = dmxInput->sigioFd[i];
+
+ fcntl(fd, F_SETOWN, getpid());
+ flags = fcntl(fd, F_GETFL);
+ flags |= O_ASYNC|O_NONBLOCK;
+ fcntl(fd, F_SETFL, flags);
+
+ AddEnabledDevice(fd);
+ dmxInput->sigioAdded[i] = TRUE;
+
+ if (++dmxFdCount == 1) dmxSigioHook();
+ }
+ }
+}
+
+static void dmxSigioRemove(DMXInputInfo *dmxInput)
+{
+ int flags;
+ int i;
+
+ switch (dmxInput->sigioState) {
+ case DMX_NOSIGIO: return;
+ case DMX_USESIGIO: return;
+ case DMX_ACTIVESIGIO: dmxInput->sigioState = DMX_USESIGIO; break;
+ }
+
+ for (i = 0; i < dmxInput->sigioFdCount; i++) {
+ if (dmxInput->sigioAdded[i]) {
+ int fd = dmxInput->sigioFd[i];
+
+ dmxInput->sigioAdded[i] = FALSE;
+ RemoveEnabledDevice(fd);
+
+ flags = fcntl(fd, F_GETFL);
+ flags &= ~(O_ASYNC|O_NONBLOCK);
+ fcntl(fd, F_SETFL, flags);
+
+ if (!--dmxFdCount) dmxSigioUnhook();
+ }
+ }
+}
+
+/** Enable SIGIO handling. This instantiates the handler with the OS. */
+void dmxSigioEnableInput(void)
+{
+ int i;
+ DMXInputInfo *dmxInput;
+
+ dmxInputEnabled = TRUE;
+ for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++)
+ dmxSigioAdd(dmxInput);
+}
+
+/** Disable SIGIO handling. This removes the hanlder from the OS. */
+void dmxSigioDisableInput(void)
+{
+ int i;
+ DMXInputInfo *dmxInput;
+
+ dmxInputEnabled = FALSE;
+ for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++)
+ dmxSigioRemove(dmxInput);
+}
+
+/** Make a note that the input device described in \a dmxInput will be
+ * using the file descriptor \a fd for SIGIO signals. Calls
+ * AddEnabledDevice ifi SIGIO handling has been enabled with
+ * #dmxSigioEnableInput(). */
+void dmxSigioRegister(DMXInputInfo *dmxInput, int fd)
+{
+ dmxInput->sigioState = DMX_USESIGIO;
+ if (dmxInput->sigioFdCount >= DMX_MAX_SIGIO_FDS)
+ dmxLog(dmxFatal, "Too many SIGIO file descriptors (%d >= %d)\n",
+ dmxInput->sigioFdCount, DMX_MAX_SIGIO_FDS);
+
+ dmxInput->sigioFd[dmxInput->sigioFdCount++] = fd;
+ if (dmxInputEnabled) dmxSigioAdd(dmxInput);
+}
+
+/** Remove the notes that \a dmxInput is using any file descriptors for
+ * SIGIO signals. Calls RemoveEnabledDevice. */
+void dmxSigioUnregister(DMXInputInfo *dmxInput)
+{
+ if (dmxInput->sigioState == DMX_NOSIGIO) return;
+ dmxSigioRemove(dmxInput);
+ dmxInput->sigioState = DMX_NOSIGIO;
+ dmxInput->sigioFdCount = 0;
+}