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 "qemu/osdep.h"
  26 #include <windows.h>
  27 #include <mmsystem.h>
  28 #include "sysemu/sysemu.h"
  29 #include "qemu-options.h"
  30
  31 /***********************************************************/
  32 /* Functions missing in mingw */
  33
  34 int setenv(const char *name, const char *value, int overwrite)
  35 {
  36     int result = 0;
  37     if (overwrite || !getenv(name)) {
  38         size_t length = strlen(name) + strlen(value) + 2;
  39         char *string = g_malloc(length);
  40         snprintf(string, length, "%s=%s", name, value);
  41         result = putenv(string);
  42
  43         /* Windows takes a copy and does not continue to use our string.
  44          * Therefore it can be safely freed on this platform.  POSIX code
  45          * typically has to leak the string because according to the spec it
  46          * becomes part of the environment.
  47          */
  48         g_free(string);
  49     }
  50     return result;
  51 }
  52
  53 static BOOL WINAPI qemu_ctrl_handler(DWORD type)
  54 {
  55     qemu_system_shutdown_request(SHUTDOWN_CAUSE_HOST_SIGNAL);
  56     /* Windows 7 kills application when the function returns.
  57        Sleep here to give QEMU a try for closing.
  58        Sleep period is 10000ms because Windows kills the program
  59        after 10 seconds anyway. */
  60     Sleep(10000);
  61
  62     return TRUE;
  63 }
  64
  65 static TIMECAPS mm_tc;
  66
  67 static void os_undo_timer_resolution(void)
  68 {
  69     timeEndPeriod(mm_tc.wPeriodMin);
  70 }
  71
  72 void os_setup_early_signal_handling(void)
  73 {
  74     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
  75     timeGetDevCaps(&mm_tc, sizeof(mm_tc));
  76     timeBeginPeriod(mm_tc.wPeriodMin);
  77     atexit(os_undo_timer_resolution);
  78 }
  79
  80 /* Look for support files in the same directory as the executable.  */
  81 char *os_find_datadir(void)
  82 {
  83     return qemu_get_exec_dir();
  84 }
  85
  86 void os_set_line_buffering(void)
  87 {
  88     setbuf(stdout, NULL);
  89     setbuf(stderr, NULL);
  90 }
  91
  92 /*
  93  * Parse OS specific command line options.
  94  * return 0 if option handled, -1 otherwise
  95  */
  96 void os_parse_cmd_args(int index, const char *optarg)
  97 {
  98     return;
  99 }
 100
 101 int qemu_create_pidfile(const char *filename)
 102 {
 103     char buffer[128];
 104     int len;
 105     HANDLE file;
 106     OVERLAPPED overlap;
 107     BOOL ret;
 108     memset(&overlap, 0, sizeof(overlap));
 109
 110     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 111                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 112
 113     if (file == INVALID_HANDLE_VALUE) {
 114         return -1;
 115     }
 116     len = snprintf(buffer, sizeof(buffer), "%d\n", getpid());
 117     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
 118                     NULL, &overlap);
 119     CloseHandle(file);
 120     if (ret == 0) {
 121         return -1;
 122     }
 123     return 0;
 124 }