util/oslib-win32.c - third_party/qemu - Git at Google

 /*
  * os-win32.c
  *
  * Copyright (c) 2003-2008 Fabrice Bellard
  * Copyright (c) 2010-2016 Red Hat, Inc.
  *
  * QEMU library functions for win32 which are shared between QEMU and
  * the QEMU tools.
  *
  * 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 "qemu/osdep.h"
 #include <windows.h>
 #include "qapi/error.h"
 #include "qemu/main-loop.h"
 #include "trace.h"
 #include "qemu/sockets.h"
 #include "qemu/cutils.h"
 #include "qemu/error-report.h"
 #include <malloc.h>

 static int get_allocation_granularity(void)
 {
     SYSTEM_INFO system_info;

     GetSystemInfo(&system_info);
     return system_info.dwAllocationGranularity;
 }

 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared,
                           bool noreserve)
 {
     void *ptr;

     if (noreserve) {
         /*
          * We need a MEM_COMMIT before accessing any memory in a MEM_RESERVE
          * area; we cannot easily mimic POSIX MAP_NORESERVE semantics.
          */
         error_report("Skipping reservation of swap space is not supported.");
         return NULL;
     }

     ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
     trace_qemu_anon_ram_alloc(size, ptr);

     if (ptr && align) {
         *align = MAX(get_allocation_granularity(), getpagesize());
     }
     return ptr;
 }

 void qemu_anon_ram_free(void *ptr, size_t size)
 {
     trace_qemu_anon_ram_free(ptr, size);
     if (ptr) {
         VirtualFree(ptr, 0, MEM_RELEASE);
     }
 }

 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 /* FIXME: add proper locking */
 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 {
     struct tm *p = gmtime(timep);
     memset(result, 0, sizeof(*result));
     if (p) {
         *result = *p;
         p = result;
     }
     return p;
 }

 /* FIXME: add proper locking */
 struct tm *localtime_r(const time_t *timep, struct tm *result)
 {
     struct tm *p = localtime(timep);
     memset(result, 0, sizeof(*result));
     if (p) {
         *result = *p;
         p = result;
     }
     return p;
 }
 #endif /* _POSIX_THREAD_SAFE_FUNCTIONS */

 static int socket_error(void)
 {
     switch (WSAGetLastError()) {
     case 0:
         return 0;
     case WSAEINTR:
         return EINTR;
     case WSAEINVAL:
         return EINVAL;
     case WSA_INVALID_HANDLE:
         return EBADF;
     case WSA_NOT_ENOUGH_MEMORY:
         return ENOMEM;
     case WSA_INVALID_PARAMETER:
         return EINVAL;
     case WSAENAMETOOLONG:
         return ENAMETOOLONG;
     case WSAENOTEMPTY:
         return ENOTEMPTY;
     case WSAEWOULDBLOCK:
          /* not using EWOULDBLOCK as we don't want code to have
           * to check both EWOULDBLOCK and EAGAIN */
         return EAGAIN;
     case WSAEINPROGRESS:
         return EINPROGRESS;
     case WSAEALREADY:
         return EALREADY;
     case WSAENOTSOCK:
         return ENOTSOCK;
     case WSAEDESTADDRREQ:
         return EDESTADDRREQ;
     case WSAEMSGSIZE:
         return EMSGSIZE;
     case WSAEPROTOTYPE:
         return EPROTOTYPE;
     case WSAENOPROTOOPT:
         return ENOPROTOOPT;
     case WSAEPROTONOSUPPORT:
         return EPROTONOSUPPORT;
     case WSAEOPNOTSUPP:
         return EOPNOTSUPP;
     case WSAEAFNOSUPPORT:
         return EAFNOSUPPORT;
     case WSAEADDRINUSE:
         return EADDRINUSE;
     case WSAEADDRNOTAVAIL:
         return EADDRNOTAVAIL;
     case WSAENETDOWN:
         return ENETDOWN;
     case WSAENETUNREACH:
         return ENETUNREACH;
     case WSAENETRESET:
         return ENETRESET;
     case WSAECONNABORTED:
         return ECONNABORTED;
     case WSAECONNRESET:
         return ECONNRESET;
     case WSAENOBUFS:
         return ENOBUFS;
     case WSAEISCONN:
         return EISCONN;
     case WSAENOTCONN:
         return ENOTCONN;
     case WSAETIMEDOUT:
         return ETIMEDOUT;
     case WSAECONNREFUSED:
         return ECONNREFUSED;
     case WSAELOOP:
         return ELOOP;
     case WSAEHOSTUNREACH:
         return EHOSTUNREACH;
     default:
         return EIO;
     }
 }

 void qemu_socket_set_block(int fd)
 {
     unsigned long opt = 0;
     qemu_socket_unselect(fd, NULL);
     ioctlsocket(fd, FIONBIO, &opt);
 }

 int qemu_socket_try_set_nonblock(int fd)
 {
     unsigned long opt = 1;
     if (ioctlsocket(fd, FIONBIO, &opt) != NO_ERROR) {
         return -socket_error();
     }
     return 0;
 }

 void qemu_socket_set_nonblock(int fd)
 {
     (void)qemu_socket_try_set_nonblock(fd);
 }

 int socket_set_fast_reuse(int fd)
 {
     /* Enabling the reuse of an endpoint that was used by a socket still in
      * TIME_WAIT state is usually performed by setting SO_REUSEADDR. On Windows
      * fast reuse is the default and SO_REUSEADDR does strange things. So we
      * don't have to do anything here. More info can be found at:
      * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx */
     return 0;
 }

 int inet_aton(const char *cp, struct in_addr *ia)
 {
     uint32_t addr = inet_addr(cp);
     if (addr == 0xffffffff) {
         return 0;
     }
     ia->s_addr = addr;
     return 1;
 }

 void qemu_set_cloexec(int fd)
 {
 }

 int qemu_get_thread_id(void)
 {
     return GetCurrentThreadId();
 }

 char *
 qemu_get_local_state_dir(void)
 {
     const char * const *data_dirs = g_get_system_data_dirs();

     g_assert(data_dirs && data_dirs[0]);

     return g_strdup(data_dirs[0]);
 }

 void qemu_set_tty_echo(int fd, bool echo)
 {
     HANDLE handle = (HANDLE)_get_osfhandle(fd);
     DWORD dwMode = 0;

     if (handle == INVALID_HANDLE_VALUE) {
         return;
     }

     GetConsoleMode(handle, &dwMode);

     if (echo) {
         SetConsoleMode(handle, dwMode | ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT);
     } else {
         SetConsoleMode(handle,
                        dwMode & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT));
     }
 }

 int getpagesize(void)
 {
     SYSTEM_INFO system_info;

     GetSystemInfo(&system_info);
     return system_info.dwPageSize;
 }

 void qemu_prealloc_mem(int fd, char *area, size_t sz, int max_threads,
                        ThreadContext *tc, Error **errp)
 {
     int i;
     size_t pagesize = qemu_real_host_page_size();

     sz = (sz + pagesize - 1) & -pagesize;
     for (i = 0; i < sz / pagesize; i++) {
         memset(area + pagesize * i, 0, 1);
     }
 }

 char *qemu_get_pid_name(pid_t pid)
 {
     /* XXX Implement me */
     abort();
 }


 bool qemu_socket_select(int sockfd, WSAEVENT hEventObject,
                         long lNetworkEvents, Error **errp)
 {
     SOCKET s = _get_osfhandle(sockfd);

     if (errp == NULL) {
         errp = &error_warn;
     }

     if (s == INVALID_SOCKET) {
         error_setg(errp, "invalid socket fd=%d", sockfd);
         return false;
     }

     if (WSAEventSelect(s, hEventObject, lNetworkEvents) != 0) {
         error_setg_win32(errp, WSAGetLastError(), "failed to WSAEventSelect()");
         return false;
     }

     return true;
 }

 bool qemu_socket_unselect(int sockfd, Error **errp)
 {
     return qemu_socket_select(sockfd, NULL, 0, errp);
 }

 int qemu_socketpair(int domain, int type, int protocol, int sv[2])
 {
     struct sockaddr_un addr = {
         0,
     };
     socklen_t socklen;
     int listener = -1;
     int client = -1;
     int server = -1;
     g_autofree char *path = NULL;
     int tmpfd;
     u_long arg;
     int ret = -1;

     g_return_val_if_fail(sv != NULL, -1);

     addr.sun_family = AF_UNIX;
     socklen = sizeof(addr);

     tmpfd = g_file_open_tmp(NULL, &path, NULL);
     if (tmpfd == -1 || !path) {
         errno = EACCES;
         goto out;
     }

     close(tmpfd);

     if (strlen(path) >= sizeof(addr.sun_path)) {
         errno = EINVAL;
         goto out;
     }

     strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);

     listener = socket(domain, type, protocol);
     if (listener == -1) {
         goto out;
     }

     if (DeleteFile(path) == 0 && GetLastError() != ERROR_FILE_NOT_FOUND) {
         errno = EACCES;
         goto out;
     }
     g_clear_pointer(&path, g_free);

     if (bind(listener, (struct sockaddr *)&addr, socklen) == -1) {
         goto out;
     }

     if (listen(listener, 1) == -1) {
         goto out;
     }

     client = socket(domain, type, protocol);
     if (client == -1) {
         goto out;
     }

     arg = 1;
     if (ioctlsocket(client, FIONBIO, &arg) != NO_ERROR) {
         goto out;
     }

     if (connect(client, (struct sockaddr *)&addr, socklen) == -1 &&
         WSAGetLastError() != WSAEWOULDBLOCK) {
         goto out;
     }

     server = accept(listener, NULL, NULL);
     if (server == -1) {
         goto out;
     }

     arg = 0;
     if (ioctlsocket(client, FIONBIO, &arg) != NO_ERROR) {
         goto out;
     }

     arg = 0;
     if (ioctlsocket(client, SIO_AF_UNIX_GETPEERPID, &arg) != NO_ERROR) {
         goto out;
     }

     if (arg != GetCurrentProcessId()) {
         errno = EPERM;
         goto out;
     }

     sv[0] = server;
     server = -1;
     sv[1] = client;
     client = -1;
     ret = 0;

 out:
     if (listener != -1) {
         close(listener);
     }
     if (client != -1) {
         close(client);
     }
     if (server != -1) {
         close(server);
     }
     if (path) {
         DeleteFile(path);
     }
     return ret;
 }

 #undef connect
 int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
                       socklen_t addrlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = connect(s, addr, addrlen);
     if (ret < 0) {
         if (WSAGetLastError() == WSAEWOULDBLOCK) {
             errno = EINPROGRESS;
         } else {
             errno = socket_error();
         }
     }
     return ret;
 }


 #undef listen
 int qemu_listen_wrap(int sockfd, int backlog)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = listen(s, backlog);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef bind
 int qemu_bind_wrap(int sockfd, const struct sockaddr *addr,
                    socklen_t addrlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = bind(s, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }

 QEMU_USED EXCEPTION_DISPOSITION
 win32_close_exception_handler(struct _EXCEPTION_RECORD *exception_record,
                               void *registration, struct _CONTEXT *context,
                               void *dispatcher)
 {
     return EXCEPTION_EXECUTE_HANDLER;
 }

 #undef close
 int qemu_close_socket_osfhandle(int fd)
 {
     SOCKET s = _get_osfhandle(fd);
     DWORD flags = 0;

     /*
      * If we were to just call _close on the descriptor, it would close the
      * HANDLE, but it wouldn't free any of the resources associated to the
      * SOCKET, and we can't call _close after calling closesocket, because
      * closesocket has already closed the HANDLE, and _close would attempt to
      * close the HANDLE again, resulting in a double free. We can however
      * protect the HANDLE from actually being closed long enough to close the
      * file descriptor, then close the socket itself.
      */
     if (!GetHandleInformation((HANDLE)s, &flags)) {
         errno = EACCES;
         return -1;
     }

     if (!SetHandleInformation((HANDLE)s, HANDLE_FLAG_PROTECT_FROM_CLOSE, HANDLE_FLAG_PROTECT_FROM_CLOSE)) {
         errno = EACCES;
         return -1;
     }

     __try1(win32_close_exception_handler) {
         /*
          * close() returns EBADF since we PROTECT_FROM_CLOSE the underlying
          * handle, but the FD is actually freed
          */
         if (close(fd) < 0 && errno != EBADF) {
             return -1;
         }
     }
     __except1 {
     }

     if (!SetHandleInformation((HANDLE)s, flags, flags)) {
         errno = EACCES;
         return -1;
     }

     return 0;
 }

 int qemu_close_wrap(int fd)
 {
     SOCKET s = INVALID_SOCKET;
     int ret = -1;

     if (!fd_is_socket(fd)) {
         return close(fd);
     }

     s = _get_osfhandle(fd);
     qemu_close_socket_osfhandle(fd);

     ret = closesocket(s);
     if (ret < 0) {
         errno = socket_error();
     }

     return ret;
 }


 #undef socket
 int qemu_socket_wrap(int domain, int type, int protocol)
 {
     SOCKET s;
     int fd;

     s = socket(domain, type, protocol);
     if (s == -1) {
         errno = socket_error();
         return -1;
     }

     fd = _open_osfhandle(s, _O_BINARY);
     if (fd < 0) {
         closesocket(s);
         /* _open_osfhandle may not set errno, and closesocket() may override it */
         errno = ENOMEM;
     }

     return fd;
 }


 #undef accept
 int qemu_accept_wrap(int sockfd, struct sockaddr *addr,
                      socklen_t *addrlen)
 {
     int fd;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     s = accept(s, addr, addrlen);
     if (s == -1) {
         errno = socket_error();
         return -1;
     }

     fd = _open_osfhandle(s, _O_BINARY);
     if (fd < 0) {
         closesocket(s);
         /* _open_osfhandle may not set errno, and closesocket() may override it */
         errno = ENOMEM;
     }

     return fd;
 }


 #undef shutdown
 int qemu_shutdown_wrap(int sockfd, int how)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = shutdown(s, how);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef ioctlsocket
 int qemu_ioctlsocket_wrap(int fd, int req, void *val)
 {
     int ret;
     SOCKET s = _get_osfhandle(fd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = ioctlsocket(s, req, val);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef getsockopt
 int qemu_getsockopt_wrap(int sockfd, int level, int optname,
                          void *optval, socklen_t *optlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = getsockopt(s, level, optname, optval, optlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef setsockopt
 int qemu_setsockopt_wrap(int sockfd, int level, int optname,
                          const void *optval, socklen_t optlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = setsockopt(s, level, optname, optval, optlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef getpeername
 int qemu_getpeername_wrap(int sockfd, struct sockaddr *addr,
                           socklen_t *addrlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = getpeername(s, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef getsockname
 int qemu_getsockname_wrap(int sockfd, struct sockaddr *addr,
                           socklen_t *addrlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = getsockname(s, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef send
 ssize_t qemu_send_wrap(int sockfd, const void *buf, size_t len, int flags)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = send(s, buf, len, flags);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef sendto
 ssize_t qemu_sendto_wrap(int sockfd, const void *buf, size_t len, int flags,
                          const struct sockaddr *addr, socklen_t addrlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = sendto(s, buf, len, flags, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef recv
 ssize_t qemu_recv_wrap(int sockfd, void *buf, size_t len, int flags)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = recv(s, buf, len, flags);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef recvfrom
 ssize_t qemu_recvfrom_wrap(int sockfd, void *buf, size_t len, int flags,
                            struct sockaddr *addr, socklen_t *addrlen)
 {
     int ret;
     SOCKET s = _get_osfhandle(sockfd);

     if (s == INVALID_SOCKET) {
         return -1;
     }

     ret = recvfrom(s, buf, len, flags, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }

 bool qemu_write_pidfile(const char *filename, Error **errp)
 {
     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) {
         error_setg(errp, "Failed to create PID file");
         return false;
     }
     len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", (pid_t)getpid());
     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
                     NULL, &overlap);
     CloseHandle(file);
     if (ret == 0) {
         error_setg(errp, "Failed to write PID file");
         return false;
     }
     return true;
 }

 size_t qemu_get_host_physmem(void)
 {
     MEMORYSTATUSEX statex;
     statex.dwLength = sizeof(statex);

     if (GlobalMemoryStatusEx(&statex)) {
         return statex.ullTotalPhys;
     }
     return 0;
 }

 int qemu_msync(void *addr, size_t length, int fd)
 {
     /**
      * Perform the sync based on the file descriptor
      * The sync range will most probably be wider than the one
      * requested - but it will still get the job done
      */
     return qemu_fdatasync(fd);
 }

 void *qemu_win32_map_alloc(size_t size, HANDLE *h, Error **errp)
 {
     void *bits;

     trace_win32_map_alloc(size);

     *h = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0,
                           size, NULL);
     if (*h == NULL) {
         error_setg_win32(errp, GetLastError(), "Failed to CreateFileMapping");
         return NULL;
     }

     bits = MapViewOfFile(*h, FILE_MAP_ALL_ACCESS, 0, 0, size);
     if (bits == NULL) {
         error_setg_win32(errp, GetLastError(), "Failed to MapViewOfFile");
         CloseHandle(*h);
         return NULL;
     }

     return bits;
 }

 void qemu_win32_map_free(void *ptr, HANDLE h, Error **errp)
 {
     trace_win32_map_free(ptr, h);

     if (UnmapViewOfFile(ptr) == 0) {
         error_setg_win32(errp, GetLastError(), "Failed to UnmapViewOfFile");
     }
     CloseHandle(h);
 }
	/*
	* os-win32.c
	*
	* Copyright (c) 2003-2008 Fabrice Bellard
	* Copyright (c) 2010-2016 Red Hat, Inc.
	*
	* QEMU library functions for win32 which are shared between QEMU and
	* the QEMU tools.
	*
	* 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 "qemu/osdep.h"
	#include <windows.h>
	#include "qapi/error.h"
	#include "qemu/main-loop.h"
	#include "trace.h"
	#include "qemu/sockets.h"
	#include "qemu/cutils.h"
	#include "qemu/error-report.h"
	#include <malloc.h>

	static int get_allocation_granularity(void)
	{
	SYSTEM_INFO system_info;

	GetSystemInfo(&system_info);
	return system_info.dwAllocationGranularity;
	}

	void qemu_anon_ram_alloc(size_t size, uint64_t align, bool shared,
	bool noreserve)
	{
	void *ptr;

	if (noreserve) {
	/*
	* We need a MEM_COMMIT before accessing any memory in a MEM_RESERVE
	* area; we cannot easily mimic POSIX MAP_NORESERVE semantics.
	*/
	error_report("Skipping reservation of swap space is not supported.");
	return NULL;
	}

	ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
	trace_qemu_anon_ram_alloc(size, ptr);

	if (ptr && align) {
	*align = MAX(get_allocation_granularity(), getpagesize());
	}
	return ptr;
	}

	void qemu_anon_ram_free(void *ptr, size_t size)
	{
	trace_qemu_anon_ram_free(ptr, size);
	if (ptr) {
	VirtualFree(ptr, 0, MEM_RELEASE);
	}
	}

	#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
	/* FIXME: add proper locking */
	struct tm gmtime_r(const time_t timep, struct tm *result)
	{
	struct tm *p = gmtime(timep);
	memset(result, 0, sizeof(*result));
	if (p) {
	result = p;
	p = result;
	}
	return p;
	}

	/* FIXME: add proper locking */
	struct tm localtime_r(const time_t timep, struct tm *result)
	{
	struct tm *p = localtime(timep);
	memset(result, 0, sizeof(*result));
	if (p) {
	result = p;
	p = result;
	}
	return p;
	}
	#endif /* _POSIX_THREAD_SAFE_FUNCTIONS */

	static int socket_error(void)
	{
	switch (WSAGetLastError()) {
	case 0:
	return 0;
	case WSAEINTR:
	return EINTR;
	case WSAEINVAL:
	return EINVAL;
	case WSA_INVALID_HANDLE:
	return EBADF;
	case WSA_NOT_ENOUGH_MEMORY:
	return ENOMEM;
	case WSA_INVALID_PARAMETER:
	return EINVAL;
	case WSAENAMETOOLONG:
	return ENAMETOOLONG;
	case WSAENOTEMPTY:
	return ENOTEMPTY;
	case WSAEWOULDBLOCK:
	/* not using EWOULDBLOCK as we don't want code to have
	* to check both EWOULDBLOCK and EAGAIN */
	return EAGAIN;
	case WSAEINPROGRESS:
	return EINPROGRESS;
	case WSAEALREADY:
	return EALREADY;
	case WSAENOTSOCK:
	return ENOTSOCK;
	case WSAEDESTADDRREQ:
	return EDESTADDRREQ;
	case WSAEMSGSIZE:
	return EMSGSIZE;
	case WSAEPROTOTYPE:
	return EPROTOTYPE;
	case WSAENOPROTOOPT:
	return ENOPROTOOPT;
	case WSAEPROTONOSUPPORT:
	return EPROTONOSUPPORT;
	case WSAEOPNOTSUPP:
	return EOPNOTSUPP;
	case WSAEAFNOSUPPORT:
	return EAFNOSUPPORT;
	case WSAEADDRINUSE:
	return EADDRINUSE;
	case WSAEADDRNOTAVAIL:
	return EADDRNOTAVAIL;
	case WSAENETDOWN:
	return ENETDOWN;
	case WSAENETUNREACH:
	return ENETUNREACH;
	case WSAENETRESET:
	return ENETRESET;
	case WSAECONNABORTED:
	return ECONNABORTED;
	case WSAECONNRESET:
	return ECONNRESET;
	case WSAENOBUFS:
	return ENOBUFS;
	case WSAEISCONN:
	return EISCONN;
	case WSAENOTCONN:
	return ENOTCONN;
	case WSAETIMEDOUT:
	return ETIMEDOUT;
	case WSAECONNREFUSED:
	return ECONNREFUSED;
	case WSAELOOP:
	return ELOOP;
	case WSAEHOSTUNREACH:
	return EHOSTUNREACH;
	default:
	return EIO;
	}
	}

	void qemu_socket_set_block(int fd)
	{
	unsigned long opt = 0;
	qemu_socket_unselect(fd, NULL);
	ioctlsocket(fd, FIONBIO, &opt);
	}

	int qemu_socket_try_set_nonblock(int fd)
	{
	unsigned long opt = 1;
	if (ioctlsocket(fd, FIONBIO, &opt) != NO_ERROR) {
	return -socket_error();
	}
	return 0;
	}

	void qemu_socket_set_nonblock(int fd)
	{
	(void)qemu_socket_try_set_nonblock(fd);
	}

	int socket_set_fast_reuse(int fd)
	{
	/* Enabling the reuse of an endpoint that was used by a socket still in
	* TIME_WAIT state is usually performed by setting SO_REUSEADDR. On Windows
	* fast reuse is the default and SO_REUSEADDR does strange things. So we
	* don't have to do anything here. More info can be found at:
	* http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx */
	return 0;
	}

	int inet_aton(const char cp, struct in_addr ia)
	{
	uint32_t addr = inet_addr(cp);
	if (addr == 0xffffffff) {
	return 0;
	}
	ia->s_addr = addr;
	return 1;
	}

	void qemu_set_cloexec(int fd)
	{
	}

	int qemu_get_thread_id(void)
	{
	return GetCurrentThreadId();
	}

	char *
	qemu_get_local_state_dir(void)
	{
	const char * const *data_dirs = g_get_system_data_dirs();

	g_assert(data_dirs && data_dirs[0]);

	return g_strdup(data_dirs[0]);
	}

	void qemu_set_tty_echo(int fd, bool echo)
	{
	HANDLE handle = (HANDLE)_get_osfhandle(fd);
	DWORD dwMode = 0;

	if (handle == INVALID_HANDLE_VALUE) {
	return;
	}

	GetConsoleMode(handle, &dwMode);

	if (echo) {
	SetConsoleMode(handle, dwMode \| ENABLE_ECHO_INPUT \| ENABLE_LINE_INPUT);
	} else {
	SetConsoleMode(handle,
	dwMode & ~(ENABLE_ECHO_INPUT \| ENABLE_LINE_INPUT));
	}
	}

	int getpagesize(void)
	{
	SYSTEM_INFO system_info;

	GetSystemInfo(&system_info);
	return system_info.dwPageSize;
	}

	void qemu_prealloc_mem(int fd, char *area, size_t sz, int max_threads,
	ThreadContext tc, Error *errp)
	{
	int i;
	size_t pagesize = qemu_real_host_page_size();

	sz = (sz + pagesize - 1) & -pagesize;
	for (i = 0; i < sz / pagesize; i++) {
	memset(area + pagesize * i, 0, 1);
	}
	}

	char *qemu_get_pid_name(pid_t pid)
	{
	/* XXX Implement me */
	abort();
	}


	bool qemu_socket_select(int sockfd, WSAEVENT hEventObject,
	long lNetworkEvents, Error **errp)
	{
	SOCKET s = _get_osfhandle(sockfd);

	if (errp == NULL) {
	errp = &error_warn;
	}

	if (s == INVALID_SOCKET) {
	error_setg(errp, "invalid socket fd=%d", sockfd);
	return false;
	}

	if (WSAEventSelect(s, hEventObject, lNetworkEvents) != 0) {
	error_setg_win32(errp, WSAGetLastError(), "failed to WSAEventSelect()");
	return false;
	}

	return true;
	}

	bool qemu_socket_unselect(int sockfd, Error **errp)
	{
	return qemu_socket_select(sockfd, NULL, 0, errp);
	}

	int qemu_socketpair(int domain, int type, int protocol, int sv[2])
	{
	struct sockaddr_un addr = {
	0,
	};
	socklen_t socklen;
	int listener = -1;
	int client = -1;
	int server = -1;
	g_autofree char *path = NULL;
	int tmpfd;
	u_long arg;
	int ret = -1;

	g_return_val_if_fail(sv != NULL, -1);

	addr.sun_family = AF_UNIX;
	socklen = sizeof(addr);

	tmpfd = g_file_open_tmp(NULL, &path, NULL);
	if (tmpfd == -1 \|\| !path) {
	errno = EACCES;
	goto out;
	}

	close(tmpfd);

	if (strlen(path) >= sizeof(addr.sun_path)) {
	errno = EINVAL;
	goto out;
	}

	strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);

	listener = socket(domain, type, protocol);
	if (listener == -1) {
	goto out;
	}

	if (DeleteFile(path) == 0 && GetLastError() != ERROR_FILE_NOT_FOUND) {
	errno = EACCES;
	goto out;
	}
	g_clear_pointer(&path, g_free);

	if (bind(listener, (struct sockaddr *)&addr, socklen) == -1) {
	goto out;
	}

	if (listen(listener, 1) == -1) {
	goto out;
	}

	client = socket(domain, type, protocol);
	if (client == -1) {
	goto out;
	}

	arg = 1;
	if (ioctlsocket(client, FIONBIO, &arg) != NO_ERROR) {
	goto out;
	}

	if (connect(client, (struct sockaddr *)&addr, socklen) == -1 &&
	WSAGetLastError() != WSAEWOULDBLOCK) {
	goto out;
	}

	server = accept(listener, NULL, NULL);
	if (server == -1) {
	goto out;
	}

	arg = 0;
	if (ioctlsocket(client, FIONBIO, &arg) != NO_ERROR) {
	goto out;
	}

	arg = 0;
	if (ioctlsocket(client, SIO_AF_UNIX_GETPEERPID, &arg) != NO_ERROR) {
	goto out;
	}

	if (arg != GetCurrentProcessId()) {
	errno = EPERM;
	goto out;
	}

	sv[0] = server;
	server = -1;
	sv[1] = client;
	client = -1;
	ret = 0;

	out:
	if (listener != -1) {
	close(listener);
	}
	if (client != -1) {
	close(client);
	}
	if (server != -1) {
	close(server);
	}
	if (path) {
	DeleteFile(path);
	}
	return ret;
	}

	#undef connect
	int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
	socklen_t addrlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = connect(s, addr, addrlen);
	if (ret < 0) {
	if (WSAGetLastError() == WSAEWOULDBLOCK) {
	errno = EINPROGRESS;
	} else {
	errno = socket_error();
	}
	}
	return ret;
	}


	#undef listen
	int qemu_listen_wrap(int sockfd, int backlog)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = listen(s, backlog);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef bind
	int qemu_bind_wrap(int sockfd, const struct sockaddr *addr,
	socklen_t addrlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = bind(s, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}

	QEMU_USED EXCEPTION_DISPOSITION
	win32_close_exception_handler(struct _EXCEPTION_RECORD *exception_record,
	void registration, struct _CONTEXT context,
	void *dispatcher)
	{
	return EXCEPTION_EXECUTE_HANDLER;
	}

	#undef close
	int qemu_close_socket_osfhandle(int fd)
	{
	SOCKET s = _get_osfhandle(fd);
	DWORD flags = 0;

	/*
	* If we were to just call _close on the descriptor, it would close the
	* HANDLE, but it wouldn't free any of the resources associated to the
	* SOCKET, and we can't call _close after calling closesocket, because
	* closesocket has already closed the HANDLE, and _close would attempt to
	* close the HANDLE again, resulting in a double free. We can however
	* protect the HANDLE from actually being closed long enough to close the
	* file descriptor, then close the socket itself.
	*/
	if (!GetHandleInformation((HANDLE)s, &flags)) {
	errno = EACCES;
	return -1;
	}

	if (!SetHandleInformation((HANDLE)s, HANDLE_FLAG_PROTECT_FROM_CLOSE, HANDLE_FLAG_PROTECT_FROM_CLOSE)) {
	errno = EACCES;
	return -1;
	}

	__try1(win32_close_exception_handler) {
	/*
	* close() returns EBADF since we PROTECT_FROM_CLOSE the underlying
	* handle, but the FD is actually freed
	*/
	if (close(fd) < 0 && errno != EBADF) {
	return -1;
	}
	}
	__except1 {
	}

	if (!SetHandleInformation((HANDLE)s, flags, flags)) {
	errno = EACCES;
	return -1;
	}

	return 0;
	}

	int qemu_close_wrap(int fd)
	{
	SOCKET s = INVALID_SOCKET;
	int ret = -1;

	if (!fd_is_socket(fd)) {
	return close(fd);
	}

	s = _get_osfhandle(fd);
	qemu_close_socket_osfhandle(fd);

	ret = closesocket(s);
	if (ret < 0) {
	errno = socket_error();
	}

	return ret;
	}


	#undef socket
	int qemu_socket_wrap(int domain, int type, int protocol)
	{
	SOCKET s;
	int fd;

	s = socket(domain, type, protocol);
	if (s == -1) {
	errno = socket_error();
	return -1;
	}

	fd = _open_osfhandle(s, _O_BINARY);
	if (fd < 0) {
	closesocket(s);
	/* _open_osfhandle may not set errno, and closesocket() may override it */
	errno = ENOMEM;
	}

	return fd;
	}


	#undef accept
	int qemu_accept_wrap(int sockfd, struct sockaddr *addr,
	socklen_t *addrlen)
	{
	int fd;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	s = accept(s, addr, addrlen);
	if (s == -1) {
	errno = socket_error();
	return -1;
	}

	fd = _open_osfhandle(s, _O_BINARY);
	if (fd < 0) {
	closesocket(s);
	/* _open_osfhandle may not set errno, and closesocket() may override it */
	errno = ENOMEM;
	}

	return fd;
	}


	#undef shutdown
	int qemu_shutdown_wrap(int sockfd, int how)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = shutdown(s, how);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef ioctlsocket
	int qemu_ioctlsocket_wrap(int fd, int req, void *val)
	{
	int ret;
	SOCKET s = _get_osfhandle(fd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = ioctlsocket(s, req, val);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef getsockopt
	int qemu_getsockopt_wrap(int sockfd, int level, int optname,
	void optval, socklen_t optlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = getsockopt(s, level, optname, optval, optlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef setsockopt
	int qemu_setsockopt_wrap(int sockfd, int level, int optname,
	const void *optval, socklen_t optlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = setsockopt(s, level, optname, optval, optlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef getpeername
	int qemu_getpeername_wrap(int sockfd, struct sockaddr *addr,
	socklen_t *addrlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = getpeername(s, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef getsockname
	int qemu_getsockname_wrap(int sockfd, struct sockaddr *addr,
	socklen_t *addrlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = getsockname(s, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef send
	ssize_t qemu_send_wrap(int sockfd, const void *buf, size_t len, int flags)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = send(s, buf, len, flags);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef sendto
	ssize_t qemu_sendto_wrap(int sockfd, const void *buf, size_t len, int flags,
	const struct sockaddr *addr, socklen_t addrlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = sendto(s, buf, len, flags, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef recv
	ssize_t qemu_recv_wrap(int sockfd, void *buf, size_t len, int flags)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = recv(s, buf, len, flags);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef recvfrom
	ssize_t qemu_recvfrom_wrap(int sockfd, void *buf, size_t len, int flags,
	struct sockaddr addr, socklen_t addrlen)
	{
	int ret;
	SOCKET s = _get_osfhandle(sockfd);

	if (s == INVALID_SOCKET) {
	return -1;
	}

	ret = recvfrom(s, buf, len, flags, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}

	bool qemu_write_pidfile(const char filename, Error *errp)
	{
	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) {
	error_setg(errp, "Failed to create PID file");
	return false;
	}
	len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", (pid_t)getpid());
	ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
	NULL, &overlap);
	CloseHandle(file);
	if (ret == 0) {
	error_setg(errp, "Failed to write PID file");
	return false;
	}
	return true;
	}

	size_t qemu_get_host_physmem(void)
	{
	MEMORYSTATUSEX statex;
	statex.dwLength = sizeof(statex);

	if (GlobalMemoryStatusEx(&statex)) {
	return statex.ullTotalPhys;
	}
	return 0;
	}

	int qemu_msync(void *addr, size_t length, int fd)
	{
	/**
	* Perform the sync based on the file descriptor
	* The sync range will most probably be wider than the one
	* requested - but it will still get the job done
	*/
	return qemu_fdatasync(fd);
	}

	void qemu_win32_map_alloc(size_t size, HANDLE h, Error **errp)
	{
	void *bits;

	trace_win32_map_alloc(size);

	*h = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0,
	size, NULL);
	if (*h == NULL) {
	error_setg_win32(errp, GetLastError(), "Failed to CreateFileMapping");
	return NULL;
	}

	bits = MapViewOfFile(*h, FILE_MAP_ALL_ACCESS, 0, 0, size);
	if (bits == NULL) {
	error_setg_win32(errp, GetLastError(), "Failed to MapViewOfFile");
	CloseHandle(*h);
	return NULL;
	}

	return bits;
	}

	void qemu_win32_map_free(void ptr, HANDLE h, Error *errp)
	{
	trace_win32_map_free(ptr, h);

	if (UnmapViewOfFile(ptr) == 0) {
	error_setg_win32(errp, GetLastError(), "Failed to UnmapViewOfFile");
	}
	CloseHandle(h);
	}