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      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), "%ld\n", (long)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 }
    274