xref: /openbmc/qemu/os-win32.c (revision 7d405b2f)
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(SHUTDOWN_CAUSE_HOST_SIGNAL);
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 int os_parse_cmd_args(int index, const char *optarg)
97 {
98     return -1;
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 }
125