os-win32.c

   1 /*
   2  * os-win32.c
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2010 Red Hat, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include <windows.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <time.h>
  30 #include <errno.h>
  31 #include <sys/time.h>
  32 #include "config-host.h"
  33 #include "sysemu.h"
  34 #include "qemu-options.h"
  35
  36 /***********************************************************/
  37 /* Polling handling */
  38
  39 typedef struct PollingEntry {
  40     PollingFunc *func;
  41     void *opaque;
  42     struct PollingEntry *next;
  43 } PollingEntry;
  44
  45 static PollingEntry *first_polling_entry;
  46
  47 int qemu_add_polling_cb(PollingFunc *func, void *opaque)
  48 {
  49     PollingEntry **ppe, *pe;
  50     pe = qemu_mallocz(sizeof(PollingEntry));
  51     pe->func = func;
  52     pe->opaque = opaque;
  53     for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next);
  54     *ppe = pe;
  55     return 0;
  56 }
  57
  58 void qemu_del_polling_cb(PollingFunc *func, void *opaque)
  59 {
  60     PollingEntry **ppe, *pe;
  61     for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) {
  62         pe = *ppe;
  63         if (pe->func == func && pe->opaque == opaque) {
  64             *ppe = pe->next;
  65             qemu_free(pe);
  66             break;
  67         }
  68     }
  69 }
  70
  71 /***********************************************************/
  72 /* Wait objects support */
  73 typedef struct WaitObjects {
  74     int num;
  75     HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
  76     WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];
  77     void *opaque[MAXIMUM_WAIT_OBJECTS + 1];
  78 } WaitObjects;
  79
  80 static WaitObjects wait_objects = {0};
  81
  82 int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
  83 {
  84     WaitObjects *w = &wait_objects;
  85
  86     if (w->num >= MAXIMUM_WAIT_OBJECTS)
  87         return -1;
  88     w->events[w->num] = handle;
  89     w->func[w->num] = func;
  90     w->opaque[w->num] = opaque;
  91     w->num++;
  92     return 0;
  93 }
  94
  95 void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
  96 {
  97     int i, found;
  98     WaitObjects *w = &wait_objects;
  99
 100     found = 0;
 101     for (i = 0; i < w->num; i++) {
 102         if (w->events[i] == handle)
 103             found = 1;
 104         if (found) {
 105             w->events[i] = w->events[i + 1];
 106             w->func[i] = w->func[i + 1];
 107             w->opaque[i] = w->opaque[i + 1];
 108         }
 109     }
 110     if (found)
 111         w->num--;
 112 }
 113
 114 void os_host_main_loop_wait(int *timeout)
 115 {
 116     int ret, ret2, i;
 117     PollingEntry *pe;
 118
 119     /* XXX: need to suppress polling by better using win32 events */
 120     ret = 0;
 121     for(pe = first_polling_entry; pe != NULL; pe = pe->next) {
 122         ret |= pe->func(pe->opaque);
 123     }
 124     if (ret == 0) {
 125         int err;
 126         WaitObjects *w = &wait_objects;
 127
 128         ret = WaitForMultipleObjects(w->num, w->events, FALSE, *timeout);
 129         if (WAIT_OBJECT_0 + 0 <= ret && ret <= WAIT_OBJECT_0 + w->num - 1) {
 130             if (w->func[ret - WAIT_OBJECT_0])
 131                 w->func[ret - WAIT_OBJECT_0](w->opaque[ret - WAIT_OBJECT_0]);
 132
 133             /* Check for additional signaled events */
 134             for(i = (ret - WAIT_OBJECT_0 + 1); i < w->num; i++) {
 135
 136                 /* Check if event is signaled */
 137                 ret2 = WaitForSingleObject(w->events[i], 0);
 138                 if(ret2 == WAIT_OBJECT_0) {
 139                     if (w->func[i])
 140                         w->func[i](w->opaque[i]);
 141                 } else if (ret2 == WAIT_TIMEOUT) {
 142                 } else {
 143                     err = GetLastError();
 144                     fprintf(stderr, "WaitForSingleObject error %d %d\n", i, err);
 145                 }
 146             }
 147         } else if (ret == WAIT_TIMEOUT) {
 148         } else {
 149             err = GetLastError();
 150             fprintf(stderr, "WaitForMultipleObjects error %d %d\n", ret, err);
 151         }
 152     }
 153
 154     *timeout = 0;
 155 }
 156
 157 static BOOL WINAPI qemu_ctrl_handler(DWORD type)
 158 {
 159     exit(STATUS_CONTROL_C_EXIT);
 160     return TRUE;
 161 }
 162
 163 void os_setup_early_signal_handling(void)
 164 {
 165     /* Note: cpu_interrupt() is currently not SMP safe, so we force
 166        QEMU to run on a single CPU */
 167     HANDLE h;
 168     DWORD mask, smask;
 169     int i;
 170
 171     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
 172
 173     h = GetCurrentProcess();
 174     if (GetProcessAffinityMask(h, &mask, &smask)) {
 175         for(i = 0; i < 32; i++) {
 176             if (mask & (1 << i))
 177                 break;
 178         }
 179         if (i != 32) {
 180             mask = 1 << i;
 181             SetProcessAffinityMask(h, mask);
 182         }
 183     }
 184 }
 185
 186 /* Look for support files in the same directory as the executable.  */
 187 char *os_find_datadir(const char *argv0)
 188 {
 189     char *p;
 190     char buf[MAX_PATH];
 191     DWORD len;
 192
 193     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
 194     if (len == 0) {
 195         return NULL;
 196     }
 197
 198     buf[len] = 0;
 199     p = buf + len - 1;
 200     while (p != buf && *p != '\\')
 201         p--;
 202     *p = 0;
 203     if (access(buf, R_OK) == 0) {
 204         return qemu_strdup(buf);
 205     }
 206     return NULL;
 207 }
 208
 209 /*
 210  * Parse OS specific command line options.
 211  * return 0 if option handled, -1 otherwise
 212  */
 213 void os_parse_cmd_args(int index, const char *optarg)
 214 {
 215     return;
 216 }
 217
 218 void os_pidfile_error(void)
 219 {
 220     fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
 221 }