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