qemu/os-win32.c
Fabien Chouteau bfc763fcfa Replace WriteFileEx with WriteFile in qemu_create_pidfile
The function that writes pidfile for win32 uses WriteFileEx which is an
asynchronous IO function. The arguments given to WriteFileEx are allocated on
the stack and one of them is "in out". When the IO operation is actually
executed the calling function has already returned, so the arguments are no
longer allocated or allocated to another frame.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-11-09 12:06:20 -06:00

152 lines
3.9 KiB
C

/*
* os-win32.c
*
* Copyright (c) 2003-2008 Fabrice Bellard
* Copyright (c) 2010 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <windows.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <sys/time.h>
#include "config-host.h"
#include "sysemu.h"
#include "qemu-options.h"
/***********************************************************/
/* Functions missing in mingw */
int setenv(const char *name, const char *value, int overwrite)
{
int result = 0;
if (overwrite || !getenv(name)) {
size_t length = strlen(name) + strlen(value) + 2;
char *string = g_malloc(length);
snprintf(string, length, "%s=%s", name, value);
result = putenv(string);
}
return result;
}
static BOOL WINAPI qemu_ctrl_handler(DWORD type)
{
exit(STATUS_CONTROL_C_EXIT);
return TRUE;
}
void os_setup_early_signal_handling(void)
{
/* Note: cpu_interrupt() is currently not SMP safe, so we force
QEMU to run on a single CPU */
HANDLE h;
DWORD_PTR mask, smask;
int i;
SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
h = GetCurrentProcess();
if (GetProcessAffinityMask(h, &mask, &smask)) {
for(i = 0; i < 32; i++) {
if (mask & (1 << i))
break;
}
if (i != 32) {
mask = 1 << i;
SetProcessAffinityMask(h, mask);
}
}
}
/* Look for support files in the same directory as the executable. */
char *os_find_datadir(const char *argv0)
{
char *p;
char buf[MAX_PATH];
DWORD len;
len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
if (len == 0) {
return NULL;
}
buf[len] = 0;
p = buf + len - 1;
while (p != buf && *p != '\\')
p--;
*p = 0;
if (access(buf, R_OK) == 0) {
return g_strdup(buf);
}
return NULL;
}
void os_set_line_buffering(void)
{
setbuf(stdout, NULL);
setbuf(stderr, NULL);
}
/*
* Parse OS specific command line options.
* return 0 if option handled, -1 otherwise
*/
void os_parse_cmd_args(int index, const char *optarg)
{
return;
}
void os_pidfile_error(void)
{
fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
}
int qemu_create_pidfile(const char *filename)
{
char buffer[128];
int len;
HANDLE file;
OVERLAPPED overlap;
BOOL ret;
memset(&overlap, 0, sizeof(overlap));
file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (file == INVALID_HANDLE_VALUE) {
return -1;
}
len = snprintf(buffer, sizeof(buffer), "%d\n", getpid());
ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
NULL, &overlap);
CloseHandle(file);
if (ret == 0) {
return -1;
}
return 0;
}
int qemu_get_thread_id(void)
{
return GetCurrentThreadId();
}