diff options
Diffstat (limited to 'xorg-server/hw/dmx/input/dmxsigio.c')
| -rw-r--r-- | xorg-server/hw/dmx/input/dmxsigio.c | 233 |
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; +} |