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 /* Functions missing in mingw */
  38
  39 int setenv(const char *name, const char *value, int overwrite)
  40 {
  41     int result = 0;
  42     if (overwrite || !getenv(name)) {
  43         size_t length = strlen(name) + strlen(value) + 2;
  44         char *string = qemu_malloc(length);
  45         snprintf(string, length, "%s=%s", name, value);
  46         result = putenv(string);
  47     }
  48     return result;
  49 }
  50
  51 /***********************************************************/
  52 /* Polling handling */
  53
  54 typedef struct PollingEntry {
  55     PollingFunc *func;
  56     void *opaque;
  57     struct PollingEntry *next;
  58 } PollingEntry;
  59
  60 static PollingEntry *first_polling_entry;
  61
  62 int qemu_add_polling_cb(PollingFunc *func, void *opaque)
  63 {
  64     PollingEntry **ppe, *pe;
  65     pe = qemu_mallocz(sizeof(PollingEntry));
  66     pe->func = func;
  67     pe->opaque = opaque;
  68     for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next);
  69     *ppe = pe;
  70     return 0;
  71 }
  72
  73 void qemu_del_polling_cb(PollingFunc *func, void *opaque)
  74 {
  75     PollingEntry **ppe, *pe;
  76     for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) {
  77         pe = *ppe;
  78         if (pe->func == func && pe->opaque == opaque) {
  79             *ppe = pe->next;
  80             qemu_free(pe);
  81             break;
  82         }
  83     }
  84 }
  85
  86 /***********************************************************/
  87 /* Wait objects support */
  88 typedef struct WaitObjects {
  89     int num;
  90     HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
  91     WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];
  92     void *opaque[MAXIMUM_WAIT_OBJECTS + 1];
  93 } WaitObjects;
  94
  95 static WaitObjects wait_objects = {0};
  96
  97 int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
  98 {
  99     WaitObjects *w = &wait_objects;
 100
 101     if (w->num >= MAXIMUM_WAIT_OBJECTS)
 102         return -1;
 103     w->events[w->num] = handle;
 104     w->func[w->num] = func;
 105     w->opaque[w->num] = opaque;
 106     w->num++;
 107     return 0;
 108 }
 109
 110 void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
 111 {
 112     int i, found;
 113     WaitObjects *w = &wait_objects;
 114
 115     found = 0;
 116     for (i = 0; i < w->num; i++) {
 117         if (w->events[i] == handle)
 118             found = 1;
 119         if (found) {
 120             w->events[i] = w->events[i + 1];
 121             w->func[i] = w->func[i + 1];
 122             w->opaque[i] = w->opaque[i + 1];
 123         }
 124     }
 125     if (found)
 126         w->num--;
 127 }
 128
 129 void os_host_main_loop_wait(int *timeout)
 130 {
 131     int ret, ret2, i;
 132     PollingEntry *pe;
 133
 134     /* XXX: need to suppress polling by better using win32 events */
 135     ret = 0;
 136     for(pe = first_polling_entry; pe != NULL; pe = pe->next) {
 137         ret |= pe->func(pe->opaque);
 138     }
 139     if (ret == 0) {
 140         int err;
 141         WaitObjects *w = &wait_objects;
 142
 143         qemu_mutex_unlock_iothread();
 144         ret = WaitForMultipleObjects(w->num, w->events, FALSE, *timeout);
 145         qemu_mutex_lock_iothread();
 146         if (WAIT_OBJECT_0 + 0 <= ret && ret <= WAIT_OBJECT_0 + w->num - 1) {
 147             if (w->func[ret - WAIT_OBJECT_0])
 148                 w->func[ret - WAIT_OBJECT_0](w->opaque[ret - WAIT_OBJECT_0]);
 149
 150             /* Check for additional signaled events */
 151             for(i = (ret - WAIT_OBJECT_0 + 1); i < w->num; i++) {
 152
 153                 /* Check if event is signaled */
 154                 ret2 = WaitForSingleObject(w->events[i], 0);
 155                 if(ret2 == WAIT_OBJECT_0) {
 156                     if (w->func[i])
 157                         w->func[i](w->opaque[i]);
 158                 } else if (ret2 == WAIT_TIMEOUT) {
 159                 } else {
 160                     err = GetLastError();
 161                     fprintf(stderr, "WaitForSingleObject error %d %d\n", i, err);
 162                 }
 163             }
 164         } else if (ret == WAIT_TIMEOUT) {
 165         } else {
 166             err = GetLastError();
 167             fprintf(stderr, "WaitForMultipleObjects error %d %d\n", ret, err);
 168         }
 169     }
 170
 171     *timeout = 0;
 172 }
 173
 174 static BOOL WINAPI qemu_ctrl_handler(DWORD type)
 175 {
 176     exit(STATUS_CONTROL_C_EXIT);
 177     return TRUE;
 178 }
 179
 180 void os_setup_early_signal_handling(void)
 181 {
 182     /* Note: cpu_interrupt() is currently not SMP safe, so we force
 183        QEMU to run on a single CPU */
 184     HANDLE h;
 185     DWORD_PTR mask, smask;
 186     int i;
 187
 188     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
 189
 190     h = GetCurrentProcess();
 191     if (GetProcessAffinityMask(h, &mask, &smask)) {
 192         for(i = 0; i < 32; i++) {
 193             if (mask & (1 << i))
 194                 break;
 195         }
 196         if (i != 32) {
 197             mask = 1 << i;
 198             SetProcessAffinityMask(h, mask);
 199         }
 200     }
 201 }
 202
 203 /* Look for support files in the same directory as the executable.  */
 204 char *os_find_datadir(const char *argv0)
 205 {
 206     char *p;
 207     char buf[MAX_PATH];
 208     DWORD len;
 209
 210     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
 211     if (len == 0) {
 212         return NULL;
 213     }
 214
 215     buf[len] = 0;
 216     p = buf + len - 1;
 217     while (p != buf && *p != '\\')
 218         p--;
 219     *p = 0;
 220     if (access(buf, R_OK) == 0) {
 221         return qemu_strdup(buf);
 222     }
 223     return NULL;
 224 }
 225
 226 void os_set_line_buffering(void)
 227 {
 228     setbuf(stdout, NULL);
 229     setbuf(stderr, NULL);
 230 }
 231
 232 /*
 233  * Parse OS specific command line options.
 234  * return 0 if option handled, -1 otherwise
 235  */
 236 void os_parse_cmd_args(int index, const char *optarg)
 237 {
 238     return;
 239 }
 240
 241 void os_pidfile_error(void)
 242 {
 243     fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
 244 }
 245
 246 int qemu_create_pidfile(const char *filename)
 247 {
 248     char buffer[128];
 249     int len;
 250     HANDLE file;
 251     OVERLAPPED overlap;
 252     BOOL ret;
 253     memset(&overlap, 0, sizeof(overlap));
 254
 255     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 256                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 257
 258     if (file == INVALID_HANDLE_VALUE) {
 259         return -1;
 260     }
 261     len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", getpid());
 262     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 263                       &overlap, NULL);
 264     if (ret == 0) {
 265         return -1;
 266     }
 267     return 0;
 268 }
 269
 270 int qemu_get_thread_id(void)
 271 {
 272     return GetCurrentThreadId();
 273 }