9pfs: fix crash when fsdev is missing
[qemu.git] / 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();
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 }