| 1 | /* sigio.c -- Support for SIGIO handler installation and removal |
| 2 | * Created: Thu Jun 3 15:39:18 1999 by faith@precisioninsight.com |
| 3 | * |
| 4 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. |
| 5 | * All Rights Reserved. |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 8 | * copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation |
| 10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 11 | * and/or sell copies of the Software, and to permit persons to whom the |
| 12 | * Software is furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice (including the next |
| 15 | * paragraph) shall be included in all copies or substantial portions of the |
| 16 | * Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 21 | * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 22 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 23 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 24 | * DEALINGS IN THE SOFTWARE. |
| 25 | * |
| 26 | * Authors: Rickard E. (Rik) Faith <faith@valinux.com> |
| 27 | */ |
| 28 | /* |
| 29 | * Copyright (c) 2002 by The XFree86 Project, Inc. |
| 30 | * |
| 31 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 32 | * copy of this software and associated documentation files (the "Software"), |
| 33 | * to deal in the Software without restriction, including without limitation |
| 34 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 35 | * and/or sell copies of the Software, and to permit persons to whom the |
| 36 | * Software is furnished to do so, subject to the following conditions: |
| 37 | * |
| 38 | * The above copyright notice and this permission notice shall be included in |
| 39 | * all copies or substantial portions of the Software. |
| 40 | * |
| 41 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 42 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 43 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 44 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 45 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 46 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 47 | * OTHER DEALINGS IN THE SOFTWARE. |
| 48 | * |
| 49 | * Except as contained in this notice, the name of the copyright holder(s) |
| 50 | * and author(s) shall not be used in advertising or otherwise to promote |
| 51 | * the sale, use or other dealings in this Software without prior written |
| 52 | * authorization from the copyright holder(s) and author(s). |
| 53 | */ |
| 54 | |
| 55 | #ifdef HAVE_XORG_CONFIG_H |
| 56 | #include <xorg-config.h> |
| 57 | #endif |
| 58 | |
| 59 | #include <X11/X.h> |
| 60 | #include "xf86.h" |
| 61 | #include "xf86Priv.h" |
| 62 | #include "xf86_OSlib.h" |
| 63 | #include "inputstr.h" |
| 64 | |
| 65 | #ifdef HAVE_STROPTS_H |
| 66 | #include <stropts.h> |
| 67 | #endif |
| 68 | |
| 69 | #ifdef MAXDEVICES |
| 70 | /* MAXDEVICES represents the maximimum number of input devices usable |
| 71 | * at the same time plus one entry for DRM support. |
| 72 | */ |
| 73 | #define MAX_FUNCS (MAXDEVICES + 1) |
| 74 | #else |
| 75 | #define MAX_FUNCS 16 |
| 76 | #endif |
| 77 | |
| 78 | typedef struct _xf86SigIOFunc { |
| 79 | void (*f) (int, void *); |
| 80 | int fd; |
| 81 | void *closure; |
| 82 | } Xf86SigIOFunc; |
| 83 | |
| 84 | static Xf86SigIOFunc xf86SigIOFuncs[MAX_FUNCS]; |
| 85 | static int xf86SigIOMax; |
| 86 | static int xf86SigIOMaxFd; |
| 87 | static fd_set xf86SigIOMask; |
| 88 | |
| 89 | /* |
| 90 | * SIGIO gives no way of discovering which fd signalled, select |
| 91 | * to discover |
| 92 | */ |
| 93 | static void |
| 94 | xf86SIGIO(int sig) |
| 95 | { |
| 96 | int i; |
| 97 | fd_set ready; |
| 98 | struct timeval to; |
| 99 | int save_errno = errno; /* do not clobber the global errno */ |
| 100 | int r; |
| 101 | |
| 102 | inSignalContext = TRUE; |
| 103 | |
| 104 | ready = xf86SigIOMask; |
| 105 | to.tv_sec = 0; |
| 106 | to.tv_usec = 0; |
| 107 | SYSCALL(r = select(xf86SigIOMaxFd, &ready, 0, 0, &to)); |
| 108 | for (i = 0; r > 0 && i < xf86SigIOMax; i++) |
| 109 | if (xf86SigIOFuncs[i].f && FD_ISSET(xf86SigIOFuncs[i].fd, &ready)) { |
| 110 | (*xf86SigIOFuncs[i].f) (xf86SigIOFuncs[i].fd, |
| 111 | xf86SigIOFuncs[i].closure); |
| 112 | r--; |
| 113 | } |
| 114 | if (r > 0) { |
| 115 | xf86Msg(X_ERROR, "SIGIO %d descriptors not handled\n", r); |
| 116 | } |
| 117 | /* restore global errno */ |
| 118 | errno = save_errno; |
| 119 | |
| 120 | inSignalContext = FALSE; |
| 121 | } |
| 122 | |
| 123 | static int |
| 124 | xf86IsPipe(int fd) |
| 125 | { |
| 126 | struct stat buf; |
| 127 | |
| 128 | if (fstat(fd, &buf) < 0) |
| 129 | return 0; |
| 130 | return S_ISFIFO(buf.st_mode); |
| 131 | } |
| 132 | |
| 133 | int |
| 134 | xf86InstallSIGIOHandler(int fd, void (*f) (int, void *), void *closure) |
| 135 | { |
| 136 | struct sigaction sa; |
| 137 | struct sigaction osa; |
| 138 | int i; |
| 139 | int installed = FALSE; |
| 140 | |
| 141 | if (!xf86Info.useSIGIO) |
| 142 | return 0; |
| 143 | |
| 144 | for (i = 0; i < MAX_FUNCS; i++) { |
| 145 | if (!xf86SigIOFuncs[i].f) { |
| 146 | if (xf86IsPipe(fd)) |
| 147 | return 0; |
| 148 | OsBlockSIGIO(); |
| 149 | #ifdef O_ASYNC |
| 150 | if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_ASYNC) == -1) { |
| 151 | xf86Msg(X_WARNING, "fcntl(%d, O_ASYNC): %s\n", |
| 152 | fd, strerror(errno)); |
| 153 | } |
| 154 | else { |
| 155 | if (fcntl(fd, F_SETOWN, getpid()) == -1) { |
| 156 | xf86Msg(X_WARNING, "fcntl(%d, F_SETOWN): %s\n", |
| 157 | fd, strerror(errno)); |
| 158 | } |
| 159 | else { |
| 160 | installed = TRUE; |
| 161 | } |
| 162 | } |
| 163 | #endif |
| 164 | #ifdef I_SETSIG /* System V Streams - used on Solaris for input devices */ |
| 165 | if (!installed && isastream(fd)) { |
| 166 | if (ioctl(fd, I_SETSIG, S_INPUT | S_ERROR | S_HANGUP) == -1) { |
| 167 | xf86Msg(X_WARNING, "fcntl(%d, I_SETSIG): %s\n", |
| 168 | fd, strerror(errno)); |
| 169 | } |
| 170 | else { |
| 171 | installed = TRUE; |
| 172 | } |
| 173 | } |
| 174 | #endif |
| 175 | if (!installed) { |
| 176 | OsReleaseSIGIO(); |
| 177 | return 0; |
| 178 | } |
| 179 | sigemptyset(&sa.sa_mask); |
| 180 | sigaddset(&sa.sa_mask, SIGIO); |
| 181 | sa.sa_flags = 0; |
| 182 | sa.sa_handler = xf86SIGIO; |
| 183 | sigaction(SIGIO, &sa, &osa); |
| 184 | xf86SigIOFuncs[i].fd = fd; |
| 185 | xf86SigIOFuncs[i].closure = closure; |
| 186 | xf86SigIOFuncs[i].f = f; |
| 187 | if (i >= xf86SigIOMax) |
| 188 | xf86SigIOMax = i + 1; |
| 189 | if (fd >= xf86SigIOMaxFd) |
| 190 | xf86SigIOMaxFd = fd + 1; |
| 191 | FD_SET(fd, &xf86SigIOMask); |
| 192 | OsReleaseSIGIO(); |
| 193 | return 1; |
| 194 | } |
| 195 | /* Allow overwriting of the closure and callback */ |
| 196 | else if (xf86SigIOFuncs[i].fd == fd) { |
| 197 | xf86SigIOFuncs[i].closure = closure; |
| 198 | xf86SigIOFuncs[i].f = f; |
| 199 | return 1; |
| 200 | } |
| 201 | } |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | int |
| 206 | xf86RemoveSIGIOHandler(int fd) |
| 207 | { |
| 208 | struct sigaction sa; |
| 209 | struct sigaction osa; |
| 210 | int i; |
| 211 | int max; |
| 212 | int maxfd; |
| 213 | int ret; |
| 214 | |
| 215 | if (!xf86Info.useSIGIO) |
| 216 | return 0; |
| 217 | |
| 218 | max = 0; |
| 219 | maxfd = -1; |
| 220 | ret = 0; |
| 221 | for (i = 0; i < MAX_FUNCS; i++) { |
| 222 | if (xf86SigIOFuncs[i].f) { |
| 223 | if (xf86SigIOFuncs[i].fd == fd) { |
| 224 | xf86SigIOFuncs[i].f = 0; |
| 225 | xf86SigIOFuncs[i].fd = 0; |
| 226 | xf86SigIOFuncs[i].closure = 0; |
| 227 | FD_CLR(fd, &xf86SigIOMask); |
| 228 | ret = 1; |
| 229 | } |
| 230 | else { |
| 231 | max = i + 1; |
| 232 | if (xf86SigIOFuncs[i].fd >= maxfd) |
| 233 | maxfd = xf86SigIOFuncs[i].fd + 1; |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | if (ret) { |
| 238 | #ifdef O_ASYNC |
| 239 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_ASYNC); |
| 240 | #endif |
| 241 | #ifdef I_SETSIG |
| 242 | if (isastream(fd)) { |
| 243 | if (ioctl(fd, I_SETSIG, 0) == -1) { |
| 244 | xf86Msg(X_WARNING, "fcntl(%d, I_SETSIG, 0): %s\n", |
| 245 | fd, strerror(errno)); |
| 246 | } |
| 247 | } |
| 248 | #endif |
| 249 | xf86SigIOMax = max; |
| 250 | xf86SigIOMaxFd = maxfd; |
| 251 | if (!max) { |
| 252 | sigemptyset(&sa.sa_mask); |
| 253 | sigaddset(&sa.sa_mask, SIGIO); |
| 254 | sa.sa_flags = 0; |
| 255 | sa.sa_handler = SIG_IGN; |
| 256 | sigaction(SIGIO, &sa, &osa); |
| 257 | } |
| 258 | } |
| 259 | return ret; |
| 260 | } |
| 261 | |
| 262 | int |
| 263 | xf86BlockSIGIO(void) |
| 264 | { |
| 265 | return OsBlockSIGIO(); |
| 266 | } |
| 267 | |
| 268 | void |
| 269 | xf86UnblockSIGIO(int wasset) |
| 270 | { |
| 271 | OsReleaseSIGIO(); |
| 272 | } |
| 273 | |
| 274 | void |
| 275 | xf86AssertBlockedSIGIO(char *where) |
| 276 | { |
| 277 | sigset_t set, old; |
| 278 | |
| 279 | sigemptyset(&set); |
| 280 | sigprocmask(SIG_BLOCK, &set, &old); |
| 281 | if (!sigismember(&old, SIGIO)) |
| 282 | xf86Msg(X_ERROR, "SIGIO not blocked at %s\n", where); |
| 283 | } |
| 284 | |
| 285 | /* XXX This is a quick hack for the benefit of xf86SetSilkenMouse() */ |
| 286 | |
| 287 | int |
| 288 | xf86SIGIOSupported(void) |
| 289 | { |
| 290 | return 1; |
| 291 | } |