util/oslib-win32.c

   1 /*
   2  * os-win32.c
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2010-2016 Red Hat, Inc.
   6  *
   7  * QEMU library functions for win32 which are shared between QEMU and
   8  * the QEMU tools.
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26  * THE SOFTWARE.
  27  */
  28
  29 #include "qemu/osdep.h"
  30 #include <windows.h>
  31 #include "qapi/error.h"
  32 #include "qemu/main-loop.h"
  33 #include "trace.h"
  34 #include "qemu/sockets.h"
  35 #include "qemu/cutils.h"
  36 #include "qemu/error-report.h"
  37 #include <malloc.h>
  38
  39 static int get_allocation_granularity(void)
  40 {
  41     SYSTEM_INFO system_info;
  42
  43     GetSystemInfo(&system_info);
  44     return system_info.dwAllocationGranularity;
  45 }
  46
  47 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared,
  48                           bool noreserve)
  49 {
  50     void *ptr;
  51
  52     if (noreserve) {
  53         /*
  54          * We need a MEM_COMMIT before accessing any memory in a MEM_RESERVE
  55          * area; we cannot easily mimic POSIX MAP_NORESERVE semantics.
  56          */
  57         error_report("Skipping reservation of swap space is not supported.");
  58         return NULL;
  59     }
  60
  61     ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  62     trace_qemu_anon_ram_alloc(size, ptr);
  63
  64     if (ptr && align) {
  65         *align = MAX(get_allocation_granularity(), getpagesize());
  66     }
  67     return ptr;
  68 }
  69
  70 void qemu_anon_ram_free(void *ptr, size_t size)
  71 {
  72     trace_qemu_anon_ram_free(ptr, size);
  73     if (ptr) {
  74         VirtualFree(ptr, 0, MEM_RELEASE);
  75     }
  76 }
  77
  78 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
  79 /* FIXME: add proper locking */
  80 struct tm *gmtime_r(const time_t *timep, struct tm *result)
  81 {
  82     struct tm *p = gmtime(timep);
  83     memset(result, 0, sizeof(*result));
  84     if (p) {
  85         *result = *p;
  86         p = result;
  87     }
  88     return p;
  89 }
  90
  91 /* FIXME: add proper locking */
  92 struct tm *localtime_r(const time_t *timep, struct tm *result)
  93 {
  94     struct tm *p = localtime(timep);
  95     memset(result, 0, sizeof(*result));
  96     if (p) {
  97         *result = *p;
  98         p = result;
  99     }
 100     return p;
 101 }
 102 #endif /* _POSIX_THREAD_SAFE_FUNCTIONS */
 103
 104 static int socket_error(void)
 105 {
 106     switch (WSAGetLastError()) {
 107     case 0:
 108         return 0;
 109     case WSAEINTR:
 110         return EINTR;
 111     case WSAEINVAL:
 112         return EINVAL;
 113     case WSA_INVALID_HANDLE:
 114         return EBADF;
 115     case WSA_NOT_ENOUGH_MEMORY:
 116         return ENOMEM;
 117     case WSA_INVALID_PARAMETER:
 118         return EINVAL;
 119     case WSAENAMETOOLONG:
 120         return ENAMETOOLONG;
 121     case WSAENOTEMPTY:
 122         return ENOTEMPTY;
 123     case WSAEWOULDBLOCK:
 124          /* not using EWOULDBLOCK as we don't want code to have
 125           * to check both EWOULDBLOCK and EAGAIN */
 126         return EAGAIN;
 127     case WSAEINPROGRESS:
 128         return EINPROGRESS;
 129     case WSAEALREADY:
 130         return EALREADY;
 131     case WSAENOTSOCK:
 132         return ENOTSOCK;
 133     case WSAEDESTADDRREQ:
 134         return EDESTADDRREQ;
 135     case WSAEMSGSIZE:
 136         return EMSGSIZE;
 137     case WSAEPROTOTYPE:
 138         return EPROTOTYPE;
 139     case WSAENOPROTOOPT:
 140         return ENOPROTOOPT;
 141     case WSAEPROTONOSUPPORT:
 142         return EPROTONOSUPPORT;
 143     case WSAEOPNOTSUPP:
 144         return EOPNOTSUPP;
 145     case WSAEAFNOSUPPORT:
 146         return EAFNOSUPPORT;
 147     case WSAEADDRINUSE:
 148         return EADDRINUSE;
 149     case WSAEADDRNOTAVAIL:
 150         return EADDRNOTAVAIL;
 151     case WSAENETDOWN:
 152         return ENETDOWN;
 153     case WSAENETUNREACH:
 154         return ENETUNREACH;
 155     case WSAENETRESET:
 156         return ENETRESET;
 157     case WSAECONNABORTED:
 158         return ECONNABORTED;
 159     case WSAECONNRESET:
 160         return ECONNRESET;
 161     case WSAENOBUFS:
 162         return ENOBUFS;
 163     case WSAEISCONN:
 164         return EISCONN;
 165     case WSAENOTCONN:
 166         return ENOTCONN;
 167     case WSAETIMEDOUT:
 168         return ETIMEDOUT;
 169     case WSAECONNREFUSED:
 170         return ECONNREFUSED;
 171     case WSAELOOP:
 172         return ELOOP;
 173     case WSAEHOSTUNREACH:
 174         return EHOSTUNREACH;
 175     default:
 176         return EIO;
 177     }
 178 }
 179
 180 void qemu_socket_set_block(int fd)
 181 {
 182     unsigned long opt = 0;
 183     qemu_socket_unselect(fd, NULL);
 184     ioctlsocket(fd, FIONBIO, &opt);
 185 }
 186
 187 int qemu_socket_try_set_nonblock(int fd)
 188 {
 189     unsigned long opt = 1;
 190     if (ioctlsocket(fd, FIONBIO, &opt) != NO_ERROR) {
 191         return -socket_error();
 192     }
 193     return 0;
 194 }
 195
 196 void qemu_socket_set_nonblock(int fd)
 197 {
 198     (void)qemu_socket_try_set_nonblock(fd);
 199 }
 200
 201 int socket_set_fast_reuse(int fd)
 202 {
 203     /* Enabling the reuse of an endpoint that was used by a socket still in
 204      * TIME_WAIT state is usually performed by setting SO_REUSEADDR. On Windows
 205      * fast reuse is the default and SO_REUSEADDR does strange things. So we
 206      * don't have to do anything here. More info can be found at:
 207      * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx */
 208     return 0;
 209 }
 210
 211 int inet_aton(const char *cp, struct in_addr *ia)
 212 {
 213     uint32_t addr = inet_addr(cp);
 214     if (addr == 0xffffffff) {
 215         return 0;
 216     }
 217     ia->s_addr = addr;
 218     return 1;
 219 }
 220
 221 void qemu_set_cloexec(int fd)
 222 {
 223 }
 224
 225 int qemu_get_thread_id(void)
 226 {
 227     return GetCurrentThreadId();
 228 }
 229
 230 char *
 231 qemu_get_local_state_dir(void)
 232 {
 233     const char * const *data_dirs = g_get_system_data_dirs();
 234
 235     g_assert(data_dirs && data_dirs[0]);
 236
 237     return g_strdup(data_dirs[0]);
 238 }
 239
 240 void qemu_set_tty_echo(int fd, bool echo)
 241 {
 242     HANDLE handle = (HANDLE)_get_osfhandle(fd);
 243     DWORD dwMode = 0;
 244
 245     if (handle == INVALID_HANDLE_VALUE) {
 246         return;
 247     }
 248
 249     GetConsoleMode(handle, &dwMode);
 250
 251     if (echo) {
 252         SetConsoleMode(handle, dwMode | ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT);
 253     } else {
 254         SetConsoleMode(handle,
 255                        dwMode & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT));
 256     }
 257 }
 258
 259 int getpagesize(void)
 260 {
 261     SYSTEM_INFO system_info;
 262
 263     GetSystemInfo(&system_info);
 264     return system_info.dwPageSize;
 265 }
 266
 267 bool qemu_prealloc_mem(int fd, char *area, size_t sz, int max_threads,
 268                        ThreadContext *tc, Error **errp)
 269 {
 270     int i;
 271     size_t pagesize = qemu_real_host_page_size();
 272
 273     sz = (sz + pagesize - 1) & -pagesize;
 274     for (i = 0; i < sz / pagesize; i++) {
 275         memset(area + pagesize * i, 0, 1);
 276     }
 277
 278     return true;
 279 }
 280
 281 char *qemu_get_pid_name(pid_t pid)
 282 {
 283     /* XXX Implement me */
 284     abort();
 285 }
 286
 287
 288 bool qemu_socket_select(int sockfd, WSAEVENT hEventObject,
 289                         long lNetworkEvents, Error **errp)
 290 {
 291     SOCKET s = _get_osfhandle(sockfd);
 292
 293     if (errp == NULL) {
 294         errp = &error_warn;
 295     }
 296
 297     if (s == INVALID_SOCKET) {
 298         error_setg(errp, "invalid socket fd=%d", sockfd);
 299         return false;
 300     }
 301
 302     if (WSAEventSelect(s, hEventObject, lNetworkEvents) != 0) {
 303         error_setg_win32(errp, WSAGetLastError(), "failed to WSAEventSelect()");
 304         return false;
 305     }
 306
 307     return true;
 308 }
 309
 310 bool qemu_socket_unselect(int sockfd, Error **errp)
 311 {
 312     return qemu_socket_select(sockfd, NULL, 0, errp);
 313 }
 314
 315 int qemu_socketpair(int domain, int type, int protocol, int sv[2])
 316 {
 317     struct sockaddr_un addr = {
 318         0,
 319     };
 320     socklen_t socklen;
 321     int listener = -1;
 322     int client = -1;
 323     int server = -1;
 324     g_autofree char *path = NULL;
 325     int tmpfd;
 326     u_long arg;
 327     int ret = -1;
 328
 329     g_return_val_if_fail(sv != NULL, -1);
 330
 331     addr.sun_family = AF_UNIX;
 332     socklen = sizeof(addr);
 333
 334     tmpfd = g_file_open_tmp(NULL, &path, NULL);
 335     if (tmpfd == -1 || !path) {
 336         errno = EACCES;
 337         goto out;
 338     }
 339
 340     close(tmpfd);
 341
 342     if (strlen(path) >= sizeof(addr.sun_path)) {
 343         errno = EINVAL;
 344         goto out;
 345     }
 346
 347     strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
 348
 349     listener = socket(domain, type, protocol);
 350     if (listener == -1) {
 351         goto out;
 352     }
 353
 354     if (DeleteFile(path) == 0 && GetLastError() != ERROR_FILE_NOT_FOUND) {
 355         errno = EACCES;
 356         goto out;
 357     }
 358     g_clear_pointer(&path, g_free);
 359
 360     if (bind(listener, (struct sockaddr *)&addr, socklen) == -1) {
 361         goto out;
 362     }
 363
 364     if (listen(listener, 1) == -1) {
 365         goto out;
 366     }
 367
 368     client = socket(domain, type, protocol);
 369     if (client == -1) {
 370         goto out;
 371     }
 372
 373     arg = 1;
 374     if (ioctlsocket(client, FIONBIO, &arg) != NO_ERROR) {
 375         goto out;
 376     }
 377
 378     if (connect(client, (struct sockaddr *)&addr, socklen) == -1 &&
 379         WSAGetLastError() != WSAEWOULDBLOCK) {
 380         goto out;
 381     }
 382
 383     server = accept(listener, NULL, NULL);
 384     if (server == -1) {
 385         goto out;
 386     }
 387
 388     arg = 0;
 389     if (ioctlsocket(client, FIONBIO, &arg) != NO_ERROR) {
 390         goto out;
 391     }
 392
 393     arg = 0;
 394     if (ioctlsocket(client, SIO_AF_UNIX_GETPEERPID, &arg) != NO_ERROR) {
 395         goto out;
 396     }
 397
 398     if (arg != GetCurrentProcessId()) {
 399         errno = EPERM;
 400         goto out;
 401     }
 402
 403     sv[0] = server;
 404     server = -1;
 405     sv[1] = client;
 406     client = -1;
 407     ret = 0;
 408
 409 out:
 410     if (listener != -1) {
 411         close(listener);
 412     }
 413     if (client != -1) {
 414         close(client);
 415     }
 416     if (server != -1) {
 417         close(server);
 418     }
 419     if (path) {
 420         DeleteFile(path);
 421     }
 422     return ret;
 423 }
 424
 425 #undef connect
 426 int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
 427                       socklen_t addrlen)
 428 {
 429     int ret;
 430     SOCKET s = _get_osfhandle(sockfd);
 431
 432     if (s == INVALID_SOCKET) {
 433         return -1;
 434     }
 435
 436     ret = connect(s, addr, addrlen);
 437     if (ret < 0) {
 438         if (WSAGetLastError() == WSAEWOULDBLOCK) {
 439             errno = EINPROGRESS;
 440         } else {
 441             errno = socket_error();
 442         }
 443     }
 444     return ret;
 445 }
 446
 447
 448 #undef listen
 449 int qemu_listen_wrap(int sockfd, int backlog)
 450 {
 451     int ret;
 452     SOCKET s = _get_osfhandle(sockfd);
 453
 454     if (s == INVALID_SOCKET) {
 455         return -1;
 456     }
 457
 458     ret = listen(s, backlog);
 459     if (ret < 0) {
 460         errno = socket_error();
 461     }
 462     return ret;
 463 }
 464
 465
 466 #undef bind
 467 int qemu_bind_wrap(int sockfd, const struct sockaddr *addr,
 468                    socklen_t addrlen)
 469 {
 470     int ret;
 471     SOCKET s = _get_osfhandle(sockfd);
 472
 473     if (s == INVALID_SOCKET) {
 474         return -1;
 475     }
 476
 477     ret = bind(s, addr, addrlen);
 478     if (ret < 0) {
 479         errno = socket_error();
 480     }
 481     return ret;
 482 }
 483
 484 QEMU_USED EXCEPTION_DISPOSITION
 485 win32_close_exception_handler(struct _EXCEPTION_RECORD *exception_record,
 486                               void *registration, struct _CONTEXT *context,
 487                               void *dispatcher)
 488 {
 489     return EXCEPTION_EXECUTE_HANDLER;
 490 }
 491
 492 #undef close
 493 int qemu_close_socket_osfhandle(int fd)
 494 {
 495     SOCKET s = _get_osfhandle(fd);
 496     DWORD flags = 0;
 497
 498     /*
 499      * If we were to just call _close on the descriptor, it would close the
 500      * HANDLE, but it wouldn't free any of the resources associated to the
 501      * SOCKET, and we can't call _close after calling closesocket, because
 502      * closesocket has already closed the HANDLE, and _close would attempt to
 503      * close the HANDLE again, resulting in a double free. We can however
 504      * protect the HANDLE from actually being closed long enough to close the
 505      * file descriptor, then close the socket itself.
 506      */
 507     if (!GetHandleInformation((HANDLE)s, &flags)) {
 508         errno = EACCES;
 509         return -1;
 510     }
 511
 512     if (!SetHandleInformation((HANDLE)s, HANDLE_FLAG_PROTECT_FROM_CLOSE, HANDLE_FLAG_PROTECT_FROM_CLOSE)) {
 513         errno = EACCES;
 514         return -1;
 515     }
 516
 517     __try1(win32_close_exception_handler) {
 518         /*
 519          * close() returns EBADF since we PROTECT_FROM_CLOSE the underlying
 520          * handle, but the FD is actually freed
 521          */
 522         if (close(fd) < 0 && errno != EBADF) {
 523             return -1;
 524         }
 525     }
 526     __except1 {
 527     }
 528
 529     if (!SetHandleInformation((HANDLE)s, flags, flags)) {
 530         errno = EACCES;
 531         return -1;
 532     }
 533
 534     return 0;
 535 }
 536
 537 int qemu_close_wrap(int fd)
 538 {
 539     SOCKET s = INVALID_SOCKET;
 540     int ret = -1;
 541
 542     if (!fd_is_socket(fd)) {
 543         return close(fd);
 544     }
 545
 546     s = _get_osfhandle(fd);
 547     qemu_close_socket_osfhandle(fd);
 548
 549     ret = closesocket(s);
 550     if (ret < 0) {
 551         errno = socket_error();
 552     }
 553
 554     return ret;
 555 }
 556
 557
 558 #undef socket
 559 int qemu_socket_wrap(int domain, int type, int protocol)
 560 {
 561     SOCKET s;
 562     int fd;
 563
 564     s = socket(domain, type, protocol);
 565     if (s == -1) {
 566         errno = socket_error();
 567         return -1;
 568     }
 569
 570     fd = _open_osfhandle(s, _O_BINARY);
 571     if (fd < 0) {
 572         closesocket(s);
 573         /* _open_osfhandle may not set errno, and closesocket() may override it */
 574         errno = ENOMEM;
 575     }
 576
 577     return fd;
 578 }
 579
 580
 581 #undef accept
 582 int qemu_accept_wrap(int sockfd, struct sockaddr *addr,
 583                      socklen_t *addrlen)
 584 {
 585     int fd;
 586     SOCKET s = _get_osfhandle(sockfd);
 587
 588     if (s == INVALID_SOCKET) {
 589         return -1;
 590     }
 591
 592     s = accept(s, addr, addrlen);
 593     if (s == -1) {
 594         errno = socket_error();
 595         return -1;
 596     }
 597
 598     fd = _open_osfhandle(s, _O_BINARY);
 599     if (fd < 0) {
 600         closesocket(s);
 601         /* _open_osfhandle may not set errno, and closesocket() may override it */
 602         errno = ENOMEM;
 603     }
 604
 605     return fd;
 606 }
 607
 608
 609 #undef shutdown
 610 int qemu_shutdown_wrap(int sockfd, int how)
 611 {
 612     int ret;
 613     SOCKET s = _get_osfhandle(sockfd);
 614
 615     if (s == INVALID_SOCKET) {
 616         return -1;
 617     }
 618
 619     ret = shutdown(s, how);
 620     if (ret < 0) {
 621         errno = socket_error();
 622     }
 623     return ret;
 624 }
 625
 626
 627 #undef ioctlsocket
 628 int qemu_ioctlsocket_wrap(int fd, int req, void *val)
 629 {
 630     int ret;
 631     SOCKET s = _get_osfhandle(fd);
 632
 633     if (s == INVALID_SOCKET) {
 634         return -1;
 635     }
 636
 637     ret = ioctlsocket(s, req, val);
 638     if (ret < 0) {
 639         errno = socket_error();
 640     }
 641     return ret;
 642 }
 643
 644
 645 #undef getsockopt
 646 int qemu_getsockopt_wrap(int sockfd, int level, int optname,
 647                          void *optval, socklen_t *optlen)
 648 {
 649     int ret;
 650     SOCKET s = _get_osfhandle(sockfd);
 651
 652     if (s == INVALID_SOCKET) {
 653         return -1;
 654     }
 655
 656     ret = getsockopt(s, level, optname, optval, optlen);
 657     if (ret < 0) {
 658         errno = socket_error();
 659     }
 660     return ret;
 661 }
 662
 663
 664 #undef setsockopt
 665 int qemu_setsockopt_wrap(int sockfd, int level, int optname,
 666                          const void *optval, socklen_t optlen)
 667 {
 668     int ret;
 669     SOCKET s = _get_osfhandle(sockfd);
 670
 671     if (s == INVALID_SOCKET) {
 672         return -1;
 673     }
 674
 675     ret = setsockopt(s, level, optname, optval, optlen);
 676     if (ret < 0) {
 677         errno = socket_error();
 678     }
 679     return ret;
 680 }
 681
 682
 683 #undef getpeername
 684 int qemu_getpeername_wrap(int sockfd, struct sockaddr *addr,
 685                           socklen_t *addrlen)
 686 {
 687     int ret;
 688     SOCKET s = _get_osfhandle(sockfd);
 689
 690     if (s == INVALID_SOCKET) {
 691         return -1;
 692     }
 693
 694     ret = getpeername(s, addr, addrlen);
 695     if (ret < 0) {
 696         errno = socket_error();
 697     }
 698     return ret;
 699 }
 700
 701
 702 #undef getsockname
 703 int qemu_getsockname_wrap(int sockfd, struct sockaddr *addr,
 704                           socklen_t *addrlen)
 705 {
 706     int ret;
 707     SOCKET s = _get_osfhandle(sockfd);
 708
 709     if (s == INVALID_SOCKET) {
 710         return -1;
 711     }
 712
 713     ret = getsockname(s, addr, addrlen);
 714     if (ret < 0) {
 715         errno = socket_error();
 716     }
 717     return ret;
 718 }
 719
 720
 721 #undef send
 722 ssize_t qemu_send_wrap(int sockfd, const void *buf, size_t len, int flags)
 723 {
 724     int ret;
 725     SOCKET s = _get_osfhandle(sockfd);
 726
 727     if (s == INVALID_SOCKET) {
 728         return -1;
 729     }
 730
 731     ret = send(s, buf, len, flags);
 732     if (ret < 0) {
 733         errno = socket_error();
 734     }
 735     return ret;
 736 }
 737
 738
 739 #undef sendto
 740 ssize_t qemu_sendto_wrap(int sockfd, const void *buf, size_t len, int flags,
 741                          const struct sockaddr *addr, socklen_t addrlen)
 742 {
 743     int ret;
 744     SOCKET s = _get_osfhandle(sockfd);
 745
 746     if (s == INVALID_SOCKET) {
 747         return -1;
 748     }
 749
 750     ret = sendto(s, buf, len, flags, addr, addrlen);
 751     if (ret < 0) {
 752         errno = socket_error();
 753     }
 754     return ret;
 755 }
 756
 757
 758 #undef recv
 759 ssize_t qemu_recv_wrap(int sockfd, void *buf, size_t len, int flags)
 760 {
 761     int ret;
 762     SOCKET s = _get_osfhandle(sockfd);
 763
 764     if (s == INVALID_SOCKET) {
 765         return -1;
 766     }
 767
 768     ret = recv(s, buf, len, flags);
 769     if (ret < 0) {
 770         errno = socket_error();
 771     }
 772     return ret;
 773 }
 774
 775
 776 #undef recvfrom
 777 ssize_t qemu_recvfrom_wrap(int sockfd, void *buf, size_t len, int flags,
 778                            struct sockaddr *addr, socklen_t *addrlen)
 779 {
 780     int ret;
 781     SOCKET s = _get_osfhandle(sockfd);
 782
 783     if (s == INVALID_SOCKET) {
 784         return -1;
 785     }
 786
 787     ret = recvfrom(s, buf, len, flags, addr, addrlen);
 788     if (ret < 0) {
 789         errno = socket_error();
 790     }
 791     return ret;
 792 }
 793
 794 bool qemu_write_pidfile(const char *filename, Error **errp)
 795 {
 796     char buffer[128];
 797     int len;
 798     HANDLE file;
 799     OVERLAPPED overlap;
 800     BOOL ret;
 801     memset(&overlap, 0, sizeof(overlap));
 802
 803     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 804                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 805
 806     if (file == INVALID_HANDLE_VALUE) {
 807         error_setg(errp, "Failed to create PID file");
 808         return false;
 809     }
 810     len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", (pid_t)getpid());
 811     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
 812                     NULL, &overlap);
 813     CloseHandle(file);
 814     if (ret == 0) {
 815         error_setg(errp, "Failed to write PID file");
 816         return false;
 817     }
 818     return true;
 819 }
 820
 821 size_t qemu_get_host_physmem(void)
 822 {
 823     MEMORYSTATUSEX statex;
 824     statex.dwLength = sizeof(statex);
 825
 826     if (GlobalMemoryStatusEx(&statex)) {
 827         return statex.ullTotalPhys;
 828     }
 829     return 0;
 830 }
 831
 832 int qemu_msync(void *addr, size_t length, int fd)
 833 {
 834     /**
 835      * Perform the sync based on the file descriptor
 836      * The sync range will most probably be wider than the one
 837      * requested - but it will still get the job done
 838      */
 839     return qemu_fdatasync(fd);
 840 }
 841
 842 void *qemu_win32_map_alloc(size_t size, HANDLE *h, Error **errp)
 843 {
 844     void *bits;
 845
 846     trace_win32_map_alloc(size);
 847
 848     *h = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0,
 849                           size, NULL);
 850     if (*h == NULL) {
 851         error_setg_win32(errp, GetLastError(), "Failed to CreateFileMapping");
 852         return NULL;
 853     }
 854
 855     bits = MapViewOfFile(*h, FILE_MAP_ALL_ACCESS, 0, 0, size);
 856     if (bits == NULL) {
 857         error_setg_win32(errp, GetLastError(), "Failed to MapViewOfFile");
 858         CloseHandle(*h);
 859         return NULL;
 860     }
 861
 862     return bits;
 863 }
 864
 865 void qemu_win32_map_free(void *ptr, HANDLE h, Error **errp)
 866 {
 867     trace_win32_map_free(ptr, h);
 868
 869     if (UnmapViewOfFile(ptr) == 0) {
 870         error_setg_win32(errp, GetLastError(), "Failed to UnmapViewOfFile");
 871     }
 872     CloseHandle(h);
 873 }