util/oslib-win32.c - 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.
  *
  * The implementation of g_poll (functions poll_rest, g_poll) at the end of
  * this file are based on code from GNOME glib-2 and use a different license,
  * see the license comment there.
  */
 #include "qemu/osdep.h"
 #include <windows.h>
 #include "qapi/error.h"
 #include "sysemu/sysemu.h"
 #include "qemu/main-loop.h"
 #include "trace.h"
 #include "qemu/sockets.h"
 #include "qemu/cutils.h"

 /* this must come after including "trace.h" */
 #include <shlobj.h>

 void *qemu_oom_check(void *ptr)
 {
     if (ptr == NULL) {
         fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
         abort();
     }
     return ptr;
 }

 void *qemu_try_memalign(size_t alignment, size_t size)
 {
     void *ptr;

     if (!size) {
         abort();
     }
     ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
     trace_qemu_memalign(alignment, size, ptr);
     return ptr;
 }

 void *qemu_memalign(size_t alignment, size_t size)
 {
     return qemu_oom_check(qemu_try_memalign(alignment, size));
 }

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

     /* FIXME: this is not exactly optimal solution since VirtualAlloc
        has 64Kb granularity, but at least it guarantees us that the
        memory is page aligned. */
     ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
     trace_qemu_anon_ram_alloc(size, ptr);
     return ptr;
 }

 void qemu_vfree(void *ptr)
 {
     trace_qemu_vfree(ptr);
     if (ptr) {
         VirtualFree(ptr, 0, MEM_RELEASE);
     }
 }

 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 CONFIG_LOCALTIME_R
 /* 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 /* CONFIG_LOCALTIME_R */

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

 void qemu_set_nonblock(int fd)
 {
     unsigned long opt = 1;
     ioctlsocket(fd, FIONBIO, &opt);
     qemu_fd_register(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;
 }


 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;
     }
 }

 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)
 {
 }

 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 #define _W32_FT_OFFSET (116444736000000000ULL)

 int qemu_gettimeofday(qemu_timeval *tp)
 {
   union {
     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
     FILETIME ft;
   }  _now;

   if(tp) {
       GetSystemTimeAsFileTime (&_now.ft);
       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
   }
   /* Always return 0 as per Open Group Base Specifications Issue 6.
      Do not set errno on error.  */
   return 0;
 }

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

 char *
 qemu_get_local_state_pathname(const char *relative_pathname)
 {
     HRESULT result;
     char base_path[MAX_PATH+1] = "";

     result = SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA, NULL,
                              /* SHGFP_TYPE_CURRENT */ 0, base_path);
     if (result != S_OK) {
         /* misconfigured environment */
         g_critical("CSIDL_COMMON_APPDATA unavailable: %ld", (long)result);
         abort();
     }
     return g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", base_path,
                            relative_pathname);
 }

 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));
     }
 }

 static char exec_dir[PATH_MAX];

 void qemu_init_exec_dir(const char *argv0)
 {

     char *p;
     char buf[MAX_PATH];
     DWORD len;

     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
     if (len == 0) {
         return;
     }

     buf[len] = 0;
     p = buf + len - 1;
     while (p != buf && *p != '\\') {
         p--;
     }
     *p = 0;
     if (access(buf, R_OK) == 0) {
         pstrcpy(exec_dir, sizeof(exec_dir), buf);
     }
 }

 char *qemu_get_exec_dir(void)
 {
     return g_strdup(exec_dir);
 }

 #if !GLIB_CHECK_VERSION(2, 50, 0)
 /*
  * The original implementation of g_poll from glib has a problem on Windows
  * when using timeouts < 10 ms.
  *
  * Whenever g_poll is called with timeout < 10 ms, it does a quick poll instead
  * of wait. This causes significant performance degradation of QEMU.
  *
  * The following code is a copy of the original code from glib/gpoll.c
  * (glib commit 20f4d1820b8d4d0fc4447188e33efffd6d4a88d8 from 2014-02-19).
  * Some debug code was removed and the code was reformatted.
  * All other code modifications are marked with 'QEMU'.
  */

 /*
  * gpoll.c: poll(2) abstraction
  * Copyright 1998 Owen Taylor
  * Copyright 2008 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */

 static int poll_rest(gboolean poll_msgs, HANDLE *handles, gint nhandles,
                      GPollFD *fds, guint nfds, gint timeout)
 {
     DWORD ready;
     GPollFD *f;
     int recursed_result;

     if (poll_msgs) {
         /* Wait for either messages or handles
          * -> Use MsgWaitForMultipleObjectsEx
          */
         ready = MsgWaitForMultipleObjectsEx(nhandles, handles, timeout,
                                             QS_ALLINPUT, MWMO_ALERTABLE);

         if (ready == WAIT_FAILED) {
             gchar *emsg = g_win32_error_message(GetLastError());
             g_warning("MsgWaitForMultipleObjectsEx failed: %s", emsg);
             g_free(emsg);
         }
     } else if (nhandles == 0) {
         /* No handles to wait for, just the timeout */
         if (timeout == INFINITE) {
             ready = WAIT_FAILED;
         } else {
             SleepEx(timeout, TRUE);
             ready = WAIT_TIMEOUT;
         }
     } else {
         /* Wait for just handles
          * -> Use WaitForMultipleObjectsEx
          */
         ready =
             WaitForMultipleObjectsEx(nhandles, handles, FALSE, timeout, TRUE);
         if (ready == WAIT_FAILED) {
             gchar *emsg = g_win32_error_message(GetLastError());
             g_warning("WaitForMultipleObjectsEx failed: %s", emsg);
             g_free(emsg);
         }
     }

     if (ready == WAIT_FAILED) {
         return -1;
     } else if (ready == WAIT_TIMEOUT || ready == WAIT_IO_COMPLETION) {
         return 0;
     } else if (poll_msgs && ready == WAIT_OBJECT_0 + nhandles) {
         for (f = fds; f < &fds[nfds]; ++f) {
             if (f->fd == G_WIN32_MSG_HANDLE && f->events & G_IO_IN) {
                 f->revents |= G_IO_IN;
             }
         }

         /* If we have a timeout, or no handles to poll, be satisfied
          * with just noticing we have messages waiting.
          */
         if (timeout != 0 || nhandles == 0) {
             return 1;
         }

         /* If no timeout and handles to poll, recurse to poll them,
          * too.
          */
         recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
         return (recursed_result == -1) ? -1 : 1 + recursed_result;
     } else if (/* QEMU: removed the following unneeded statement which causes
                 * a compiler warning: ready >= WAIT_OBJECT_0 && */
                ready < WAIT_OBJECT_0 + nhandles) {
         for (f = fds; f < &fds[nfds]; ++f) {
             if ((HANDLE) f->fd == handles[ready - WAIT_OBJECT_0]) {
                 f->revents = f->events;
             }
         }

         /* If no timeout and polling several handles, recurse to poll
          * the rest of them.
          */
         if (timeout == 0 && nhandles > 1) {
             /* Remove the handle that fired */
             int i;
             for (i = ready - WAIT_OBJECT_0 + 1; i < nhandles; i++) {
                 handles[i-1] = handles[i];
             }
             nhandles--;
             recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
             return (recursed_result == -1) ? -1 : 1 + recursed_result;
         }
         return 1;
     }

     return 0;
 }

 gint g_poll(GPollFD *fds, guint nfds, gint timeout)
 {
     HANDLE handles[MAXIMUM_WAIT_OBJECTS];
     gboolean poll_msgs = FALSE;
     GPollFD *f;
     gint nhandles = 0;
     int retval;

     for (f = fds; f < &fds[nfds]; ++f) {
         if (f->fd == G_WIN32_MSG_HANDLE && (f->events & G_IO_IN)) {
             poll_msgs = TRUE;
         } else if (f->fd > 0) {
             /* Don't add the same handle several times into the array, as
              * docs say that is not allowed, even if it actually does seem
              * to work.
              */
             gint i;

             for (i = 0; i < nhandles; i++) {
                 if (handles[i] == (HANDLE) f->fd) {
                     break;
                 }
             }

             if (i == nhandles) {
                 if (nhandles == MAXIMUM_WAIT_OBJECTS) {
                     g_warning("Too many handles to wait for!\n");
                     break;
                 } else {
                     handles[nhandles++] = (HANDLE) f->fd;
                 }
             }
         }
     }

     for (f = fds; f < &fds[nfds]; ++f) {
         f->revents = 0;
     }

     if (timeout == -1) {
         timeout = INFINITE;
     }

     /* Polling for several things? */
     if (nhandles > 1 || (nhandles > 0 && poll_msgs)) {
         /* First check if one or several of them are immediately
          * available
          */
         retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, 0);

         /* If not, and we have a significant timeout, poll again with
          * timeout then. Note that this will return indication for only
          * one event, or only for messages. We ignore timeouts less than
          * ten milliseconds as they are mostly pointless on Windows, the
          * MsgWaitForMultipleObjectsEx() call will timeout right away
          * anyway.
          *
          * Modification for QEMU: replaced timeout >= 10 by timeout > 0.
          */
         if (retval == 0 && (timeout == INFINITE || timeout > 0)) {
             retval = poll_rest(poll_msgs, handles, nhandles,
                                fds, nfds, timeout);
         }
     } else {
         /* Just polling for one thing, so no need to check first if
          * available immediately
          */
         retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, timeout);
     }

     if (retval == -1) {
         for (f = fds; f < &fds[nfds]; ++f) {
             f->revents = 0;
         }
     }

     return retval;
 }
 #endif

 int getpagesize(void)
 {
     SYSTEM_INFO system_info;

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

 void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus,
                      Error **errp)
 {
     int i;
     size_t pagesize = getpagesize();

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


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


 pid_t qemu_fork(Error **errp)
 {
     errno = ENOSYS;
     error_setg_errno(errp, errno,
                      "cannot fork child process");
     return -1;
 }


 #undef connect
 int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
                       socklen_t addrlen)
 {
     int ret;
     ret = connect(sockfd, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef listen
 int qemu_listen_wrap(int sockfd, int backlog)
 {
     int ret;
     ret = listen(sockfd, 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;
     ret = bind(sockfd, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef socket
 int qemu_socket_wrap(int domain, int type, int protocol)
 {
     int ret;
     ret = socket(domain, type, protocol);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef accept
 int qemu_accept_wrap(int sockfd, struct sockaddr *addr,
                      socklen_t *addrlen)
 {
     int ret;
     ret = accept(sockfd, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef shutdown
 int qemu_shutdown_wrap(int sockfd, int how)
 {
     int ret;
     ret = shutdown(sockfd, how);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef ioctlsocket
 int qemu_ioctlsocket_wrap(int fd, int req, void *val)
 {
     int ret;
     ret = ioctlsocket(fd, req, val);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }


 #undef closesocket
 int qemu_closesocket_wrap(int fd)
 {
     int ret;
     ret = closesocket(fd);
     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;
     ret = getsockopt(sockfd, 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;
     ret = setsockopt(sockfd, 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;
     ret = getpeername(sockfd, 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;
     ret = getsockname(sockfd, 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;
     ret = send(sockfd, 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;
     ret = sendto(sockfd, 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;
     ret = recv(sockfd, 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;
     ret = recvfrom(sockfd, buf, len, flags, addr, addrlen);
     if (ret < 0) {
         errno = socket_error();
     }
     return ret;
 }
	/*
	* 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.
	*
	* The implementation of g_poll (functions poll_rest, g_poll) at the end of
	* this file are based on code from GNOME glib-2 and use a different license,
	* see the license comment there.
	*/
	#include "qemu/osdep.h"
	#include <windows.h>
	#include "qapi/error.h"
	#include "sysemu/sysemu.h"
	#include "qemu/main-loop.h"
	#include "trace.h"
	#include "qemu/sockets.h"
	#include "qemu/cutils.h"

	/* this must come after including "trace.h" */
	#include <shlobj.h>

	void qemu_oom_check(void ptr)
	{
	if (ptr == NULL) {
	fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
	abort();
	}
	return ptr;
	}

	void *qemu_try_memalign(size_t alignment, size_t size)
	{
	void *ptr;

	if (!size) {
	abort();
	}
	ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
	trace_qemu_memalign(alignment, size, ptr);
	return ptr;
	}

	void *qemu_memalign(size_t alignment, size_t size)
	{
	return qemu_oom_check(qemu_try_memalign(alignment, size));
	}

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

	/* FIXME: this is not exactly optimal solution since VirtualAlloc
	has 64Kb granularity, but at least it guarantees us that the
	memory is page aligned. */
	ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
	trace_qemu_anon_ram_alloc(size, ptr);
	return ptr;
	}

	void qemu_vfree(void *ptr)
	{
	trace_qemu_vfree(ptr);
	if (ptr) {
	VirtualFree(ptr, 0, MEM_RELEASE);
	}
	}

	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 CONFIG_LOCALTIME_R
	/* 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 /* CONFIG_LOCALTIME_R */

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

	void qemu_set_nonblock(int fd)
	{
	unsigned long opt = 1;
	ioctlsocket(fd, FIONBIO, &opt);
	qemu_fd_register(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;
	}


	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;
	}
	}

	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)
	{
	}

	/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
	#define _W32_FT_OFFSET (116444736000000000ULL)

	int qemu_gettimeofday(qemu_timeval *tp)
	{
	union {
	unsigned long long ns100; /time since 1 Jan 1601 in 100ns units /
	FILETIME ft;
	} _now;

	if(tp) {
	GetSystemTimeAsFileTime (&_now.ft);
	tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
	tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
	}
	/* Always return 0 as per Open Group Base Specifications Issue 6.
	Do not set errno on error. */
	return 0;
	}

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

	char *
	qemu_get_local_state_pathname(const char *relative_pathname)
	{
	HRESULT result;
	char base_path[MAX_PATH+1] = "";

	result = SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA, NULL,
	/* SHGFP_TYPE_CURRENT */ 0, base_path);
	if (result != S_OK) {
	/* misconfigured environment */
	g_critical("CSIDL_COMMON_APPDATA unavailable: %ld", (long)result);
	abort();
	}
	return g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", base_path,
	relative_pathname);
	}

	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));
	}
	}

	static char exec_dir[PATH_MAX];

	void qemu_init_exec_dir(const char *argv0)
	{

	char *p;
	char buf[MAX_PATH];
	DWORD len;

	len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
	if (len == 0) {
	return;
	}

	buf[len] = 0;
	p = buf + len - 1;
	while (p != buf && *p != '\\') {
	p--;
	}
	*p = 0;
	if (access(buf, R_OK) == 0) {
	pstrcpy(exec_dir, sizeof(exec_dir), buf);
	}
	}

	char *qemu_get_exec_dir(void)
	{
	return g_strdup(exec_dir);
	}

	#if !GLIB_CHECK_VERSION(2, 50, 0)
	/*
	* The original implementation of g_poll from glib has a problem on Windows
	* when using timeouts < 10 ms.
	*
	* Whenever g_poll is called with timeout < 10 ms, it does a quick poll instead
	* of wait. This causes significant performance degradation of QEMU.
	*
	* The following code is a copy of the original code from glib/gpoll.c
	* (glib commit 20f4d1820b8d4d0fc4447188e33efffd6d4a88d8 from 2014-02-19).
	* Some debug code was removed and the code was reformatted.
	* All other code modifications are marked with 'QEMU'.
	*/

	/*
	* gpoll.c: poll(2) abstraction
	* Copyright 1998 Owen Taylor
	* Copyright 2008 Red Hat, Inc.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*/

	static int poll_rest(gboolean poll_msgs, HANDLE *handles, gint nhandles,
	GPollFD *fds, guint nfds, gint timeout)
	{
	DWORD ready;
	GPollFD *f;
	int recursed_result;

	if (poll_msgs) {
	/* Wait for either messages or handles
	* -> Use MsgWaitForMultipleObjectsEx
	*/
	ready = MsgWaitForMultipleObjectsEx(nhandles, handles, timeout,
	QS_ALLINPUT, MWMO_ALERTABLE);

	if (ready == WAIT_FAILED) {
	gchar *emsg = g_win32_error_message(GetLastError());
	g_warning("MsgWaitForMultipleObjectsEx failed: %s", emsg);
	g_free(emsg);
	}
	} else if (nhandles == 0) {
	/* No handles to wait for, just the timeout */
	if (timeout == INFINITE) {
	ready = WAIT_FAILED;
	} else {
	SleepEx(timeout, TRUE);
	ready = WAIT_TIMEOUT;
	}
	} else {
	/* Wait for just handles
	* -> Use WaitForMultipleObjectsEx
	*/
	ready =
	WaitForMultipleObjectsEx(nhandles, handles, FALSE, timeout, TRUE);
	if (ready == WAIT_FAILED) {
	gchar *emsg = g_win32_error_message(GetLastError());
	g_warning("WaitForMultipleObjectsEx failed: %s", emsg);
	g_free(emsg);
	}
	}

	if (ready == WAIT_FAILED) {
	return -1;
	} else if (ready == WAIT_TIMEOUT \|\| ready == WAIT_IO_COMPLETION) {
	return 0;
	} else if (poll_msgs && ready == WAIT_OBJECT_0 + nhandles) {
	for (f = fds; f < &fds[nfds]; ++f) {
	if (f->fd == G_WIN32_MSG_HANDLE && f->events & G_IO_IN) {
	f->revents \|= G_IO_IN;
	}
	}

	/* If we have a timeout, or no handles to poll, be satisfied
	* with just noticing we have messages waiting.
	*/
	if (timeout != 0 \|\| nhandles == 0) {
	return 1;
	}

	/* If no timeout and handles to poll, recurse to poll them,
	* too.
	*/
	recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
	return (recursed_result == -1) ? -1 : 1 + recursed_result;
	} else if (/* QEMU: removed the following unneeded statement which causes
	* a compiler warning: ready >= WAIT_OBJECT_0 && */
	ready < WAIT_OBJECT_0 + nhandles) {
	for (f = fds; f < &fds[nfds]; ++f) {
	if ((HANDLE) f->fd == handles[ready - WAIT_OBJECT_0]) {
	f->revents = f->events;
	}
	}

	/* If no timeout and polling several handles, recurse to poll
	* the rest of them.
	*/
	if (timeout == 0 && nhandles > 1) {
	/* Remove the handle that fired */
	int i;
	for (i = ready - WAIT_OBJECT_0 + 1; i < nhandles; i++) {
	handles[i-1] = handles[i];
	}
	nhandles--;
	recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
	return (recursed_result == -1) ? -1 : 1 + recursed_result;
	}
	return 1;
	}

	return 0;
	}

	gint g_poll(GPollFD *fds, guint nfds, gint timeout)
	{
	HANDLE handles[MAXIMUM_WAIT_OBJECTS];
	gboolean poll_msgs = FALSE;
	GPollFD *f;
	gint nhandles = 0;
	int retval;

	for (f = fds; f < &fds[nfds]; ++f) {
	if (f->fd == G_WIN32_MSG_HANDLE && (f->events & G_IO_IN)) {
	poll_msgs = TRUE;
	} else if (f->fd > 0) {
	/* Don't add the same handle several times into the array, as
	* docs say that is not allowed, even if it actually does seem
	* to work.
	*/
	gint i;

	for (i = 0; i < nhandles; i++) {
	if (handles[i] == (HANDLE) f->fd) {
	break;
	}
	}

	if (i == nhandles) {
	if (nhandles == MAXIMUM_WAIT_OBJECTS) {
	g_warning("Too many handles to wait for!\n");
	break;
	} else {
	handles[nhandles++] = (HANDLE) f->fd;
	}
	}
	}
	}

	for (f = fds; f < &fds[nfds]; ++f) {
	f->revents = 0;
	}

	if (timeout == -1) {
	timeout = INFINITE;
	}

	/* Polling for several things? */
	if (nhandles > 1 \|\| (nhandles > 0 && poll_msgs)) {
	/* First check if one or several of them are immediately
	* available
	*/
	retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, 0);

	/* If not, and we have a significant timeout, poll again with
	* timeout then. Note that this will return indication for only
	* one event, or only for messages. We ignore timeouts less than
	* ten milliseconds as they are mostly pointless on Windows, the
	* MsgWaitForMultipleObjectsEx() call will timeout right away
	* anyway.
	*
	* Modification for QEMU: replaced timeout >= 10 by timeout > 0.
	*/
	if (retval == 0 && (timeout == INFINITE \|\| timeout > 0)) {
	retval = poll_rest(poll_msgs, handles, nhandles,
	fds, nfds, timeout);
	}
	} else {
	/* Just polling for one thing, so no need to check first if
	* available immediately
	*/
	retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, timeout);
	}

	if (retval == -1) {
	for (f = fds; f < &fds[nfds]; ++f) {
	f->revents = 0;
	}
	}

	return retval;
	}
	#endif

	int getpagesize(void)
	{
	SYSTEM_INFO system_info;

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

	void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus,
	Error **errp)
	{
	int i;
	size_t pagesize = getpagesize();

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


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


	pid_t qemu_fork(Error **errp)
	{
	errno = ENOSYS;
	error_setg_errno(errp, errno,
	"cannot fork child process");
	return -1;
	}


	#undef connect
	int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
	socklen_t addrlen)
	{
	int ret;
	ret = connect(sockfd, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef listen
	int qemu_listen_wrap(int sockfd, int backlog)
	{
	int ret;
	ret = listen(sockfd, 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;
	ret = bind(sockfd, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef socket
	int qemu_socket_wrap(int domain, int type, int protocol)
	{
	int ret;
	ret = socket(domain, type, protocol);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef accept
	int qemu_accept_wrap(int sockfd, struct sockaddr *addr,
	socklen_t *addrlen)
	{
	int ret;
	ret = accept(sockfd, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef shutdown
	int qemu_shutdown_wrap(int sockfd, int how)
	{
	int ret;
	ret = shutdown(sockfd, how);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef ioctlsocket
	int qemu_ioctlsocket_wrap(int fd, int req, void *val)
	{
	int ret;
	ret = ioctlsocket(fd, req, val);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}


	#undef closesocket
	int qemu_closesocket_wrap(int fd)
	{
	int ret;
	ret = closesocket(fd);
	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;
	ret = getsockopt(sockfd, 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;
	ret = setsockopt(sockfd, 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;
	ret = getpeername(sockfd, 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;
	ret = getsockname(sockfd, 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;
	ret = send(sockfd, 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;
	ret = sendto(sockfd, 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;
	ret = recv(sockfd, 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;
	ret = recvfrom(sockfd, buf, len, flags, addr, addrlen);
	if (ret < 0) {
	errno = socket_error();
	}
	return ret;
	}