qemu/io/channel-watch.c

   1 /*
   2  * QEMU I/O channels watch helper APIs
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "io/channel-watch.h"
  23
  24 typedef struct QIOChannelFDSource QIOChannelFDSource;
  25 struct QIOChannelFDSource {
  26     GSource parent;
  27     GPollFD fd;
  28     QIOChannel *ioc;
  29     GIOCondition condition;
  30 };
  31
  32
  33 #ifdef CONFIG_WIN32
  34 typedef struct QIOChannelSocketSource QIOChannelSocketSource;
  35 struct QIOChannelSocketSource {
  36     GSource parent;
  37     GPollFD fd;
  38     QIOChannel *ioc;
  39     SOCKET socket;
  40     int revents;
  41     GIOCondition condition;
  42 };
  43
  44 #endif
  45
  46
  47 typedef struct QIOChannelFDPairSource QIOChannelFDPairSource;
  48 struct QIOChannelFDPairSource {
  49     GSource parent;
  50     GPollFD fdread;
  51     GPollFD fdwrite;
  52     QIOChannel *ioc;
  53     GIOCondition condition;
  54 };
  55
  56
  57 static gboolean
  58 qio_channel_fd_source_prepare(GSource *source G_GNUC_UNUSED,
  59                               gint *timeout)
  60 {
  61     *timeout = -1;
  62
  63     return FALSE;
  64 }
  65
  66
  67 static gboolean
  68 qio_channel_fd_source_check(GSource *source)
  69 {
  70     QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;
  71
  72     return ssource->fd.revents & ssource->condition;
  73 }
  74
  75
  76 static gboolean
  77 qio_channel_fd_source_dispatch(GSource *source,
  78                                GSourceFunc callback,
  79                                gpointer user_data)
  80 {
  81     QIOChannelFunc func = (QIOChannelFunc)callback;
  82     QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;
  83
  84     return (*func)(ssource->ioc,
  85                    ssource->fd.revents & ssource->condition,
  86                    user_data);
  87 }
  88
  89
  90 static void
  91 qio_channel_fd_source_finalize(GSource *source)
  92 {
  93     QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;
  94
  95     object_unref(OBJECT(ssource->ioc));
  96 }
  97
  98
  99 #ifdef CONFIG_WIN32
 100 static gboolean
 101 qio_channel_socket_source_prepare(GSource *source G_GNUC_UNUSED,
 102                                   gint *timeout)
 103 {
 104     *timeout = -1;
 105
 106     return FALSE;
 107 }
 108
 109
 110 /*
 111  * NB, this impl only works when the socket is in non-blocking
 112  * mode on Win32
 113  */
 114 static gboolean
 115 qio_channel_socket_source_check(GSource *source)
 116 {
 117     static struct timeval tv0;
 118
 119     QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;
 120     WSANETWORKEVENTS ev;
 121     fd_set rfds, wfds, xfds;
 122
 123     if (!ssource->condition) {
 124         return 0;
 125     }
 126
 127     WSAEnumNetworkEvents(ssource->socket, ssource->ioc->event, &ev);
 128
 129     FD_ZERO(&rfds);
 130     FD_ZERO(&wfds);
 131     FD_ZERO(&xfds);
 132     if (ssource->condition & G_IO_IN) {
 133         FD_SET((SOCKET)ssource->socket, &rfds);
 134     }
 135     if (ssource->condition & G_IO_OUT) {
 136         FD_SET((SOCKET)ssource->socket, &wfds);
 137     }
 138     if (ssource->condition & G_IO_PRI) {
 139         FD_SET((SOCKET)ssource->socket, &xfds);
 140     }
 141     ssource->revents = 0;
 142     if (select(0, &rfds, &wfds, &xfds, &tv0) == 0) {
 143         return 0;
 144     }
 145
 146     if (FD_ISSET(ssource->socket, &rfds)) {
 147         ssource->revents |= G_IO_IN;
 148     }
 149     if (FD_ISSET(ssource->socket, &wfds)) {
 150         ssource->revents |= G_IO_OUT;
 151     }
 152     if (FD_ISSET(ssource->socket, &xfds)) {
 153         ssource->revents |= G_IO_PRI;
 154     }
 155
 156     return ssource->revents;
 157 }
 158
 159
 160 static gboolean
 161 qio_channel_socket_source_dispatch(GSource *source,
 162                                    GSourceFunc callback,
 163                                    gpointer user_data)
 164 {
 165     QIOChannelFunc func = (QIOChannelFunc)callback;
 166     QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;
 167
 168     return (*func)(ssource->ioc, ssource->revents, user_data);
 169 }
 170
 171
 172 static void
 173 qio_channel_socket_source_finalize(GSource *source)
 174 {
 175     QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;
 176
 177     object_unref(OBJECT(ssource->ioc));
 178 }
 179
 180
 181 GSourceFuncs qio_channel_socket_source_funcs = {
 182     qio_channel_socket_source_prepare,
 183     qio_channel_socket_source_check,
 184     qio_channel_socket_source_dispatch,
 185     qio_channel_socket_source_finalize
 186 };
 187 #endif
 188
 189
 190 static gboolean
 191 qio_channel_fd_pair_source_prepare(GSource *source G_GNUC_UNUSED,
 192                                    gint *timeout)
 193 {
 194     *timeout = -1;
 195
 196     return FALSE;
 197 }
 198
 199
 200 static gboolean
 201 qio_channel_fd_pair_source_check(GSource *source)
 202 {
 203     QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
 204     GIOCondition poll_condition = ssource->fdread.revents |
 205         ssource->fdwrite.revents;
 206
 207     return poll_condition & ssource->condition;
 208 }
 209
 210
 211 static gboolean
 212 qio_channel_fd_pair_source_dispatch(GSource *source,
 213                                     GSourceFunc callback,
 214                                     gpointer user_data)
 215 {
 216     QIOChannelFunc func = (QIOChannelFunc)callback;
 217     QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
 218     GIOCondition poll_condition = ssource->fdread.revents |
 219         ssource->fdwrite.revents;
 220
 221     return (*func)(ssource->ioc,
 222                    poll_condition & ssource->condition,
 223                    user_data);
 224 }
 225
 226
 227 static void
 228 qio_channel_fd_pair_source_finalize(GSource *source)
 229 {
 230     QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
 231
 232     object_unref(OBJECT(ssource->ioc));
 233 }
 234
 235
 236 GSourceFuncs qio_channel_fd_source_funcs = {
 237     qio_channel_fd_source_prepare,
 238     qio_channel_fd_source_check,
 239     qio_channel_fd_source_dispatch,
 240     qio_channel_fd_source_finalize
 241 };
 242
 243
 244 GSourceFuncs qio_channel_fd_pair_source_funcs = {
 245     qio_channel_fd_pair_source_prepare,
 246     qio_channel_fd_pair_source_check,
 247     qio_channel_fd_pair_source_dispatch,
 248     qio_channel_fd_pair_source_finalize
 249 };
 250
 251
 252 GSource *qio_channel_create_fd_watch(QIOChannel *ioc,
 253                                      int fd,
 254                                      GIOCondition condition)
 255 {
 256     GSource *source;
 257     QIOChannelFDSource *ssource;
 258
 259     source = g_source_new(&qio_channel_fd_source_funcs,
 260                           sizeof(QIOChannelFDSource));
 261     ssource = (QIOChannelFDSource *)source;
 262
 263     ssource->ioc = ioc;
 264     object_ref(OBJECT(ioc));
 265
 266     ssource->condition = condition;
 267
 268 #ifdef CONFIG_WIN32
 269     ssource->fd.fd = (gint64)_get_osfhandle(fd);
 270 #else
 271     ssource->fd.fd = fd;
 272 #endif
 273     ssource->fd.events = condition;
 274
 275     g_source_add_poll(source, &ssource->fd);
 276
 277     return source;
 278 }
 279
 280 #ifdef CONFIG_WIN32
 281 GSource *qio_channel_create_socket_watch(QIOChannel *ioc,
 282                                          int socket,
 283                                          GIOCondition condition)
 284 {
 285     GSource *source;
 286     QIOChannelSocketSource *ssource;
 287
 288     source = g_source_new(&qio_channel_socket_source_funcs,
 289                           sizeof(QIOChannelSocketSource));
 290     ssource = (QIOChannelSocketSource *)source;
 291
 292     ssource->ioc = ioc;
 293     object_ref(OBJECT(ioc));
 294
 295     ssource->condition = condition;
 296     ssource->socket = socket;
 297     ssource->revents = 0;
 298
 299     ssource->fd.fd = (gintptr)ioc->event;
 300     ssource->fd.events = G_IO_IN;
 301
 302     g_source_add_poll(source, &ssource->fd);
 303
 304     return source;
 305 }
 306 #else
 307 GSource *qio_channel_create_socket_watch(QIOChannel *ioc,
 308                                          int socket,
 309                                          GIOCondition condition)
 310 {
 311     return qio_channel_create_fd_watch(ioc, socket, condition);
 312 }
 313 #endif
 314
 315 GSource *qio_channel_create_fd_pair_watch(QIOChannel *ioc,
 316                                           int fdread,
 317                                           int fdwrite,
 318                                           GIOCondition condition)
 319 {
 320     GSource *source;
 321     QIOChannelFDPairSource *ssource;
 322
 323     source = g_source_new(&qio_channel_fd_pair_source_funcs,
 324                           sizeof(QIOChannelFDPairSource));
 325     ssource = (QIOChannelFDPairSource *)source;
 326
 327     ssource->ioc = ioc;
 328     object_ref(OBJECT(ioc));
 329
 330     ssource->condition = condition;
 331
 332 #ifdef CONFIG_WIN32
 333     ssource->fdread.fd = (gint64)_get_osfhandle(fdread);
 334     ssource->fdwrite.fd = (gint64)_get_osfhandle(fdwrite);
 335 #else
 336     ssource->fdread.fd = fdread;
 337     ssource->fdwrite.fd = fdwrite;
 338 #endif
 339
 340     ssource->fdread.events = condition & G_IO_IN;
 341     ssource->fdwrite.events = condition & G_IO_OUT;
 342
 343     g_source_add_poll(source, &ssource->fdread);
 344     g_source_add_poll(source, &ssource->fdwrite);
 345
 346     return source;
 347 }