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/*
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 * os-win32.c
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 *
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 * Copyright (c) 2003-2008 Fabrice Bellard
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 * Copyright (c) 2010 Red Hat, Inc.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 */
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#include <windows.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <time.h>
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#include <errno.h>
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#include <sys/time.h>
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#include "config-host.h"
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#include "sysemu.h"
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#include "qemu-options.h"
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/***********************************************************/
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/* Functions missing in mingw */
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int setenv(const char *name, const char *value, int overwrite)
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{
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    int result = 0;
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    if (overwrite || !getenv(name)) {
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        size_t length = strlen(name) + strlen(value) + 2;
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        char *string = qemu_malloc(length);
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        snprintf(string, length, "%s=%s", name, value);
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        result = putenv(string);
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    }
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    return result;
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}
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/***********************************************************/
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/* Polling handling */
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typedef struct PollingEntry {
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    PollingFunc *func;
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    void *opaque;
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    struct PollingEntry *next;
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} PollingEntry;
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static PollingEntry *first_polling_entry;
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int qemu_add_polling_cb(PollingFunc *func, void *opaque)
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{
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    PollingEntry **ppe, *pe;
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    pe = qemu_mallocz(sizeof(PollingEntry));
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    pe->func = func;
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    pe->opaque = opaque;
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    for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next);
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    *ppe = pe;
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    return 0;
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}
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void qemu_del_polling_cb(PollingFunc *func, void *opaque)
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{
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    PollingEntry **ppe, *pe;
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    for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) {
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        pe = *ppe;
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        if (pe->func == func && pe->opaque == opaque) {
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            *ppe = pe->next;
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            qemu_free(pe);
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            break;
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        }
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    }
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}
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/***********************************************************/
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/* Wait objects support */
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typedef struct WaitObjects {
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    int num;
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    HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
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    WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];
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    void *opaque[MAXIMUM_WAIT_OBJECTS + 1];
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} WaitObjects;
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static WaitObjects wait_objects = {0};
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int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
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{
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    WaitObjects *w = &wait_objects;
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    if (w->num >= MAXIMUM_WAIT_OBJECTS)
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        return -1;
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    w->events[w->num] = handle;
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    w->func[w->num] = func;
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    w->opaque[w->num] = opaque;
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    w->num++;
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    return 0;
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}
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void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
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{
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    int i, found;
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    WaitObjects *w = &wait_objects;
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    found = 0;
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    for (i = 0; i < w->num; i++) {
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        if (w->events[i] == handle)
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            found = 1;
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        if (found) {
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            w->events[i] = w->events[i + 1];
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            w->func[i] = w->func[i + 1];
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            w->opaque[i] = w->opaque[i + 1];
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        }
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    }
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    if (found)
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        w->num--;
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}
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void os_host_main_loop_wait(int *timeout)
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{
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    int ret, ret2, i;
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    PollingEntry *pe;
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    /* XXX: need to suppress polling by better using win32 events */
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    ret = 0;
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    for(pe = first_polling_entry; pe != NULL; pe = pe->next) {
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        ret |= pe->func(pe->opaque);
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    }
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    if (ret == 0) {
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        int err;
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        WaitObjects *w = &wait_objects;
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        ret = WaitForMultipleObjects(w->num, w->events, FALSE, *timeout);
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        if (WAIT_OBJECT_0 + 0 <= ret && ret <= WAIT_OBJECT_0 + w->num - 1) {
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            if (w->func[ret - WAIT_OBJECT_0])
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                w->func[ret - WAIT_OBJECT_0](w->opaque[ret - WAIT_OBJECT_0]);
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            /* Check for additional signaled events */
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            for(i = (ret - WAIT_OBJECT_0 + 1); i < w->num; i++) {
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                /* Check if event is signaled */
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                ret2 = WaitForSingleObject(w->events[i], 0);
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                if(ret2 == WAIT_OBJECT_0) {
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                    if (w->func[i])
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                        w->func[i](w->opaque[i]);
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                } else if (ret2 == WAIT_TIMEOUT) {
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                } else {
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                    err = GetLastError();
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                    fprintf(stderr, "WaitForSingleObject error %d %d\n", i, err);
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                }
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            }
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        } else if (ret == WAIT_TIMEOUT) {
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        } else {
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            err = GetLastError();
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            fprintf(stderr, "WaitForMultipleObjects error %d %d\n", ret, err);
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        }
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    }
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    *timeout = 0;
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}
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static BOOL WINAPI qemu_ctrl_handler(DWORD type)
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{
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    exit(STATUS_CONTROL_C_EXIT);
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    return TRUE;
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}
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void os_setup_early_signal_handling(void)
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{
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    /* Note: cpu_interrupt() is currently not SMP safe, so we force
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       QEMU to run on a single CPU */
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    HANDLE h;
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    DWORD mask, smask;
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    int i;
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    SetConsoleCtrlHandler(qemu_ctrl_handler, TRUE);
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    h = GetCurrentProcess();
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    if (GetProcessAffinityMask(h, &mask, &smask)) {
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        for(i = 0; i < 32; i++) {
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            if (mask & (1 << i))
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                break;
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        }
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        if (i != 32) {
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            mask = 1 << i;
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            SetProcessAffinityMask(h, mask);
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        }
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    }
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}
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/* Look for support files in the same directory as the executable.  */
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char *os_find_datadir(const char *argv0)
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{
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    char *p;
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    char buf[MAX_PATH];
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    DWORD len;
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    len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
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    if (len == 0) {
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        return NULL;
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    }
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    buf[len] = 0;
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    p = buf + len - 1;
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    while (p != buf && *p != '\\')
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        p--;
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    *p = 0;
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    if (access(buf, R_OK) == 0) {
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        return qemu_strdup(buf);
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    }
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    return NULL;
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}
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void os_set_line_buffering(void)
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{
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    setbuf(stdout, NULL);
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    setbuf(stderr, NULL);
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}
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/*
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 * Parse OS specific command line options.
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 * return 0 if option handled, -1 otherwise
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 */
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void os_parse_cmd_args(int index, const char *optarg)
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{
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    return;
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}
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void os_pidfile_error(void)
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{
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    fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
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}
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int qemu_create_pidfile(const char *filename)
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{
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    char buffer[128];
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    int len;
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    HANDLE file;
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    OVERLAPPED overlap;
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    BOOL ret;
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    memset(&overlap, 0, sizeof(overlap));
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    file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
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                      OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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    if (file == INVALID_HANDLE_VALUE) {
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        return -1;
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    }
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    len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
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    ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
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                      &overlap, NULL);
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    if (ret == 0) {
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        return -1;
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    }
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    return 0;
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}