286 lines
7.4 KiB
C
286 lines
7.4 KiB
C
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/* sigio.c -- Support for SIGIO handler installation and removal
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* Created: Thu Jun 3 15:39:18 1999 by faith@precisioninsight.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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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 a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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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
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors: Rickard E. (Rik) Faith <faith@valinux.com>
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*/
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/*
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* Copyright (c) 2002 by The XFree86 Project, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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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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*
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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
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of the copyright holder(s)
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* and author(s) shall not be used in advertising or otherwise to promote
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* the sale, use or other dealings in this Software without prior written
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* authorization from the copyright holder(s) and author(s).
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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# include <X11/X.h>
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# include "xf86.h"
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# include "xf86Priv.h"
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# include "xf86_OSlib.h"
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# include "inputstr.h"
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/*
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* Linux libc5 defines FASYNC, but not O_ASYNC. Don't know if it is
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* functional or not.
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*/
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#if defined(FASYNC) && !defined(O_ASYNC)
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# define O_ASYNC FASYNC
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#endif
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#ifdef MAX_DEVICES
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/* MAX_DEVICES represents the maximimum number of input devices usable
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* at the same time plus one entry for DRM support.
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*/
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# define MAX_FUNCS (MAX_DEVICES + 1)
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#else
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# define MAX_FUNCS 16
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#endif
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typedef struct _xf86SigIOFunc {
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void (*f) (int, void *);
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int fd;
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void *closure;
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} Xf86SigIOFunc;
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static Xf86SigIOFunc xf86SigIOFuncs[MAX_FUNCS];
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static int xf86SigIOMax;
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static int xf86SigIOMaxFd;
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static fd_set xf86SigIOMask;
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/*
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* SIGIO gives no way of discovering which fd signalled, select
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* to discover
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*/
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static void
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xf86SIGIO (int sig)
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{
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int i;
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fd_set ready;
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struct timeval to;
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int r;
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ready = xf86SigIOMask;
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to.tv_sec = 0;
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to.tv_usec = 0;
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SYSCALL (r = select (xf86SigIOMaxFd, &ready, 0, 0, &to));
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for (i = 0; r > 0 && i < xf86SigIOMax; i++)
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if (xf86SigIOFuncs[i].f && FD_ISSET (xf86SigIOFuncs[i].fd, &ready))
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{
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(*xf86SigIOFuncs[i].f)(xf86SigIOFuncs[i].fd,
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xf86SigIOFuncs[i].closure);
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r--;
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}
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if (r > 0) {
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xf86Msg(X_ERROR, "SIGIO %d descriptors not handled\n", r);
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}
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}
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static int
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xf86IsPipe (int fd)
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{
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struct stat buf;
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if (fstat (fd, &buf) < 0)
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return 0;
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return S_ISFIFO(buf.st_mode);
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}
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_X_EXPORT int
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xf86InstallSIGIOHandler(int fd, void (*f)(int, void *), void *closure)
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{
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struct sigaction sa;
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struct sigaction osa;
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int i;
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int blocked;
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for (i = 0; i < MAX_FUNCS; i++)
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{
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if (!xf86SigIOFuncs[i].f)
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{
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if (xf86IsPipe (fd))
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return 0;
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blocked = xf86BlockSIGIO();
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if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_ASYNC) == -1) {
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xf86Msg(X_WARNING, "fcntl(%d, O_ASYNC): %s\n",
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fd, strerror(errno));
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xf86UnblockSIGIO(blocked);
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return 0;
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}
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if (fcntl(fd, F_SETOWN, getpid()) == -1) {
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xf86Msg(X_WARNING, "fcntl(%d, F_SETOWN): %s\n",
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fd, strerror(errno));
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xf86UnblockSIGIO(blocked);
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return 0;
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}
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGIO);
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sa.sa_flags = 0;
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sa.sa_handler = xf86SIGIO;
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sigaction(SIGIO, &sa, &osa);
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xf86SigIOFuncs[i].fd = fd;
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xf86SigIOFuncs[i].closure = closure;
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xf86SigIOFuncs[i].f = f;
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if (i >= xf86SigIOMax)
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xf86SigIOMax = i+1;
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if (fd >= xf86SigIOMaxFd)
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xf86SigIOMaxFd = fd + 1;
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FD_SET (fd, &xf86SigIOMask);
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xf86UnblockSIGIO(blocked);
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return 1;
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}
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/* Allow overwriting of the closure and callback */
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else if (xf86SigIOFuncs[i].fd == fd)
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{
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xf86SigIOFuncs[i].closure = closure;
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xf86SigIOFuncs[i].f = f;
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return 1;
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}
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}
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return 0;
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}
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_X_EXPORT int
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xf86RemoveSIGIOHandler(int fd)
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{
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struct sigaction sa;
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struct sigaction osa;
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int i;
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int max;
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int maxfd;
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int ret;
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max = 0;
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maxfd = -1;
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ret = 0;
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for (i = 0; i < MAX_FUNCS; i++)
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{
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if (xf86SigIOFuncs[i].f)
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{
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if (xf86SigIOFuncs[i].fd == fd)
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{
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xf86SigIOFuncs[i].f = 0;
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xf86SigIOFuncs[i].fd = 0;
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xf86SigIOFuncs[i].closure = 0;
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FD_CLR (fd, &xf86SigIOMask);
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ret = 1;
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}
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else
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{
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max = i + 1;
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if (xf86SigIOFuncs[i].fd >= maxfd)
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maxfd = xf86SigIOFuncs[i].fd + 1;
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}
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}
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}
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if (ret)
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{
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fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_ASYNC);
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xf86SigIOMax = max;
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xf86SigIOMaxFd = maxfd;
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if (!max)
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{
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGIO);
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sa.sa_flags = 0;
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sa.sa_handler = SIG_DFL;
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sigaction(SIGIO, &sa, &osa);
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}
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}
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return ret;
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}
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_X_EXPORT int
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xf86BlockSIGIO (void)
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{
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sigset_t set, old;
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int ret;
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sigemptyset (&set);
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sigaddset (&set, SIGIO);
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sigprocmask (SIG_BLOCK, &set, &old);
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ret = sigismember (&old, SIGIO);
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#ifdef DEBUG
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ErrorF("%i = xf86BlockSIGIO()\n",ret);
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#endif
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return ret;
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}
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_X_EXPORT void
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xf86UnblockSIGIO (int wasset)
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{
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sigset_t set;
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#ifdef DEBUG
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ErrorF("xf86UnblockSIGIO(%i)\n",wasset);
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#endif
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if (!wasset)
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{
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sigemptyset (&set);
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sigaddset (&set, SIGIO);
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sigprocmask (SIG_UNBLOCK, &set, NULL);
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}
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}
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void
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xf86AssertBlockedSIGIO (char *where)
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{
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sigset_t set, old;
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sigemptyset (&set);
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sigprocmask (SIG_BLOCK, &set, &old);
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if (!sigismember (&old, SIGIO))
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xf86Msg (X_ERROR, "SIGIO not blocked at %s\n", where);
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}
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/* XXX This is a quick hack for the benefit of xf86SetSilkenMouse() */
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int
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xf86SIGIOSupported (void)
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{
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return 1;
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}
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