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 <unistd.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <time.h>
  30 #include <errno.h>
  31 #include <sys/time.h>
  32 #include "config-host.h"
  33 #include "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 void os_setup_early_signal_handling(void)
  71 {
  72     /* Note: cpu_interrupt() is currently not SMP safe, so we force
  73        QEMU to run on a single CPU */
  74     HANDLE h;
  75     DWORD_PTR mask, smask;
  76     int i;
  77
  78     SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
  79
  80     h = GetCurrentProcess();
  81     if (GetProcessAffinityMask(h, &mask, &smask)) {
  82         for(i = 0; i < 32; i++) {
  83             if (mask & (1 << i))
  84                 break;
  85         }
  86         if (i != 32) {
  87             mask = 1 << i;
  88             SetProcessAffinityMask(h, mask);
  89         }
  90     }
  91 }
  92
  93 /* Look for support files in the same directory as the executable.  */
  94 char *os_find_datadir(const char *argv0)
  95 {
  96     char *p;
  97     char buf[MAX_PATH];
  98     DWORD len;
  99
 100     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
 101     if (len == 0) {
 102         return NULL;
 103     }
 104
 105     buf[len] = 0;
 106     p = buf + len - 1;
 107     while (p != buf && *p != '\\')
 108         p--;
 109     *p = 0;
 110     if (access(buf, R_OK) == 0) {
 111         return g_strdup(buf);
 112     }
 113     return NULL;
 114 }
 115
 116 void os_set_line_buffering(void)
 117 {
 118     setbuf(stdout, NULL);
 119     setbuf(stderr, NULL);
 120 }
 121
 122 /*
 123  * Parse OS specific command line options.
 124  * return 0 if option handled, -1 otherwise
 125  */
 126 void os_parse_cmd_args(int index, const char *optarg)
 127 {
 128     return;
 129 }
 130
 131 void os_pidfile_error(void)
 132 {
 133     fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
 134 }
 135
 136 int qemu_create_pidfile(const char *filename)
 137 {
 138     char buffer[128];
 139     int len;
 140     HANDLE file;
 141     OVERLAPPED overlap;
 142     BOOL ret;
 143     memset(&overlap, 0, sizeof(overlap));
 144
 145     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 146                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 147
 148     if (file == INVALID_HANDLE_VALUE) {
 149         return -1;
 150     }
 151     len = snprintf(buffer, sizeof(buffer), "%d\n", getpid());
 152     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
 153                     NULL, &overlap);
 154     CloseHandle(file);
 155     if (ret == 0) {
 156         return -1;
 157     }
 158     return 0;
 159 }