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 <time.h>
  30 #include <errno.h>
  31 #include <sys/time.h>
  32 #include "config-host.h"
  33 #include "sysemu/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 = g_malloc(length);
  45         snprintf(string, length, "%s=%s", name, value);
  46         result = putenv(string);
  47
  48         /* Windows takes a copy and does not continue to use our string.
  49          * Therefore it can be safely freed on this platform.  POSIX code
  50          * typically has to leak the string because according to the spec it
  51          * becomes part of the environment.
  52          */
  53         g_free(string);
  54     }
  55     return result;
  56 }
  57
  58 static BOOL WINAPI qemu_ctrl_handler(DWORD type)
  59 {
  60     qemu_system_shutdown_request();
  61     /* Windows 7 kills application when the function returns.
  62        Sleep here to give QEMU a try for closing.
  63        Sleep period is 10000ms because Windows kills the program
  64        after 10 seconds anyway. */
  65     Sleep(10000);
  66
  67     return TRUE;
  68 }
  69
  70 static TIMECAPS mm_tc;
  71
  72 static void os_undo_timer_resolution(void)
  73 {
  74     timeEndPeriod(mm_tc.wPeriodMin);
  75 }
  76
  77 void os_setup_early_signal_handling(void)
  78 {
  79     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
  80     timeGetDevCaps(&mm_tc, sizeof(mm_tc));
  81     timeBeginPeriod(mm_tc.wPeriodMin);
  82     atexit(os_undo_timer_resolution);
  83 }
  84
  85 /* Look for support files in the same directory as the executable.  */
  86 char *os_find_datadir(void)
  87 {
  88     return qemu_get_exec_dir();
  89 }
  90
  91 void os_set_line_buffering(void)
  92 {
  93     setbuf(stdout, NULL);
  94     setbuf(stderr, NULL);
  95 }
  96
  97 /*
  98  * Parse OS specific command line options.
  99  * return 0 if option handled, -1 otherwise
 100  */
 101 void os_parse_cmd_args(int index, const char *optarg)
 102 {
 103     return;
 104 }
 105
 106 int qemu_create_pidfile(const char *filename)
 107 {
 108     char buffer[128];
 109     int len;
 110     HANDLE file;
 111     OVERLAPPED overlap;
 112     BOOL ret;
 113     memset(&overlap, 0, sizeof(overlap));
 114
 115     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 116                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 117
 118     if (file == INVALID_HANDLE_VALUE) {
 119         return -1;
 120     }
 121     len = snprintf(buffer, sizeof(buffer), "%d\n", getpid());
 122     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
 123                     NULL, &overlap);
 124     CloseHandle(file);
 125     if (ret == 0) {
 126         return -1;
 127     }
 128     return 0;
 129 }