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 <mmsystem.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <signal.h>
  30 #include <time.h>
  31 #include <errno.h>
  32 #include <sys/time.h>
  33 #include "config-host.h"
  34 #include "sysemu/sysemu.h"
  35 #include "qemu-options.h"
  36
  37 /***********************************************************/
  38 /* Functions missing in mingw */
  39
  40 #if defined(CONFIG_THREAD)
  41
  42 int clock_gettime(clockid_t clock_id, struct timespec *pTimespec)
  43 {
  44   int result = 0;
  45   if (clock_id == CLOCK_REALTIME && pTimespec != 0) {
  46     DWORD t = GetTickCount();
  47     const unsigned cps = 1000;
  48     struct timespec ts;
  49     ts.tv_sec  = t / cps;
  50     ts.tv_nsec = (t % cps) * (1000000000UL / cps);
  51     *pTimespec = ts;
  52   } else {
  53     errno = EINVAL;
  54     result = -1;
  55   }
  56   return result;
  57 }
  58
  59 int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset)
  60 {
  61     /* Dummy, do nothing. */
  62     return EINVAL;
  63 }
  64
  65 int sigfillset(sigset_t *set)
  66 {
  67     int result = 0;
  68     if (set) {
  69         *(set) = (sigset_t)(-1);
  70     } else {
  71         errno = EINVAL;
  72         result = -1;
  73     }
  74     return result;
  75 }
  76
  77 #endif /* CONFIG_THREAD */
  78
  79 int setenv(const char *name, const char *value, int overwrite)
  80 {
  81     int result = 0;
  82     if (overwrite || !getenv(name)) {
  83         size_t length = strlen(name) + strlen(value) + 2;
  84         char *string = g_malloc(length);
  85         snprintf(string, length, "%s=%s", name, value);
  86         result = putenv(string);
  87
  88         /* Windows takes a copy and does not continue to use our string.
  89          * Therefore it can be safely freed on this platform.  POSIX code
  90          * typically has to leak the string because according to the spec it
  91          * becomes part of the environment.
  92          */
  93         g_free(string);
  94     }
  95     return result;
  96 }
  97
  98 static BOOL WINAPI qemu_ctrl_handler(DWORD type)
  99 {
 100     qemu_system_shutdown_request();
 101     /* Windows 7 kills application when the function returns.
 102        Sleep here to give QEMU a try for closing.
 103        Sleep period is 10000ms because Windows kills the program
 104        after 10 seconds anyway. */
 105     Sleep(10000);
 106
 107     return TRUE;
 108 }
 109
 110 static TIMECAPS mm_tc;
 111
 112 static void os_undo_timer_resolution(void)
 113 {
 114     timeEndPeriod(mm_tc.wPeriodMin);
 115 }
 116
 117 void os_setup_early_signal_handling(void)
 118 {
 119     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
 120     timeGetDevCaps(&mm_tc, sizeof(mm_tc));
 121     timeBeginPeriod(mm_tc.wPeriodMin);
 122     atexit(os_undo_timer_resolution);
 123 }
 124
 125 /* Look for support files in the same directory as the executable.  */
 126 char *os_find_datadir(const char *argv0)
 127 {
 128     char *p;
 129     char buf[MAX_PATH];
 130     DWORD len;
 131
 132     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
 133     if (len == 0) {
 134         return NULL;
 135     }
 136
 137     buf[len] = 0;
 138     p = buf + len - 1;
 139     while (p != buf && *p != '\\')
 140         p--;
 141     *p = 0;
 142     if (access(buf, R_OK) == 0) {
 143         return g_strdup(buf);
 144     }
 145     return NULL;
 146 }
 147
 148 void os_set_line_buffering(void)
 149 {
 150     setbuf(stdout, NULL);
 151     setbuf(stderr, NULL);
 152 }
 153
 154 /*
 155  * Parse OS specific command line options.
 156  * return 0 if option handled, -1 otherwise
 157  */
 158 void os_parse_cmd_args(int index, const char *optarg)
 159 {
 160     return;
 161 }
 162
 163 void os_pidfile_error(void)
 164 {
 165     fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
 166 }
 167
 168 int qemu_create_pidfile(const char *filename)
 169 {
 170     char buffer[128];
 171     int len;
 172     HANDLE file;
 173     OVERLAPPED overlap;
 174     BOOL ret;
 175     memset(&overlap, 0, sizeof(overlap));
 176
 177     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 178                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 179
 180     if (file == INVALID_HANDLE_VALUE) {
 181         return -1;
 182     }
 183     len = snprintf(buffer, sizeof(buffer), "%d\n", getpid());
 184     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
 185                     NULL, &overlap);
 186     CloseHandle(file);
 187     if (ret == 0) {
 188         return -1;
 189     }
 190     return 0;
 191 }