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 int setenv(const char *name, const char *value, int overwrite)
  41 {
  42     int result = 0;
  43     if (overwrite || !getenv(name)) {
  44         size_t length = strlen(name) + strlen(value) + 2;
  45         char *string = g_malloc(length);
  46         snprintf(string, length, "%s=%s", name, value);
  47         result = putenv(string);
  48
  49         /* Windows takes a copy and does not continue to use our string.
  50          * Therefore it can be safely freed on this platform.  POSIX code
  51          * typically has to leak the string because according to the spec it
  52          * becomes part of the environment.
  53          */
  54         g_free(string);
  55     }
  56     return result;
  57 }
  58
  59 static BOOL WINAPI qemu_ctrl_handler(DWORD type)
  60 {
  61     qemu_system_shutdown_request();
  62     /* Windows 7 kills application when the function returns.
  63        Sleep here to give QEMU a try for closing.
  64        Sleep period is 10000ms because Windows kills the program
  65        after 10 seconds anyway. */
  66     Sleep(10000);
  67
  68     return TRUE;
  69 }
  70
  71 static TIMECAPS mm_tc;
  72
  73 static void os_undo_timer_resolution(void)
  74 {
  75     timeEndPeriod(mm_tc.wPeriodMin);
  76 }
  77
  78 void os_setup_early_signal_handling(void)
  79 {
  80     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
  81     timeGetDevCaps(&mm_tc, sizeof(mm_tc));
  82     timeBeginPeriod(mm_tc.wPeriodMin);
  83     atexit(os_undo_timer_resolution);
  84 }
  85
  86 /* Look for support files in the same directory as the executable.  */
  87 char *os_find_datadir(const char *argv0)
  88 {
  89     char *p;
  90     char buf[MAX_PATH];
  91     DWORD len;
  92
  93     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
  94     if (len == 0) {
  95         return NULL;
  96     }
  97
  98     buf[len] = 0;
  99     p = buf + len - 1;
 100     while (p != buf && *p != '\\')
 101         p--;
 102     *p = 0;
 103     if (access(buf, R_OK) == 0) {
 104         return g_strdup(buf);
 105     }
 106     return NULL;
 107 }
 108
 109 void os_set_line_buffering(void)
 110 {
 111     setbuf(stdout, NULL);
 112     setbuf(stderr, NULL);
 113 }
 114
 115 /*
 116  * Parse OS specific command line options.
 117  * return 0 if option handled, -1 otherwise
 118  */
 119 void os_parse_cmd_args(int index, const char *optarg)
 120 {
 121     return;
 122 }
 123
 124 void os_pidfile_error(void)
 125 {
 126     fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
 127 }
 128
 129 int qemu_create_pidfile(const char *filename)
 130 {
 131     char buffer[128];
 132     int len;
 133     HANDLE file;
 134     OVERLAPPED overlap;
 135     BOOL ret;
 136     memset(&overlap, 0, sizeof(overlap));
 137
 138     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 139                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 140
 141     if (file == INVALID_HANDLE_VALUE) {
 142         return -1;
 143     }
 144     len = snprintf(buffer, sizeof(buffer), "%d\n", getpid());
 145     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
 146                     NULL, &overlap);
 147     CloseHandle(file);
 148     if (ret == 0) {
 149         return -1;
 150     }
 151     return 0;
 152 }