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  * The implementation of g_poll (functions poll_rest, g_poll) at the end of
  29  * this file are based on code from GNOME glib-2 and use a different license,
  30  * see the license comment there.
  31  */
  32
  33 #include "qemu/osdep.h"
  34 #include <windows.h>
  35 #include "qemu-common.h"
  36 #include "qapi/error.h"
  37 #include "sysemu/sysemu.h"
  38 #include "qemu/main-loop.h"
  39 #include "trace.h"
  40 #include "qemu/sockets.h"
  41 #include "qemu/cutils.h"
  42
  43 /* this must come after including "trace.h" */
  44 #include <shlobj.h>
  45
  46 void *qemu_oom_check(void *ptr)
  47 {
  48     if (ptr == NULL) {
  49         fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
  50         abort();
  51     }
  52     return ptr;
  53 }
  54
  55 void *qemu_try_memalign(size_t alignment, size_t size)
  56 {
  57     void *ptr;
  58
  59     if (!size) {
  60         abort();
  61     }
  62     ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  63     trace_qemu_memalign(alignment, size, ptr);
  64     return ptr;
  65 }
  66
  67 void *qemu_memalign(size_t alignment, size_t size)
  68 {
  69     return qemu_oom_check(qemu_try_memalign(alignment, size));
  70 }
  71
  72 static int get_allocation_granularity(void)
  73 {
  74     SYSTEM_INFO system_info;
  75
  76     GetSystemInfo(&system_info);
  77     return system_info.dwAllocationGranularity;
  78 }
  79
  80 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared)
  81 {
  82     void *ptr;
  83
  84     ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  85     trace_qemu_anon_ram_alloc(size, ptr);
  86
  87     if (ptr && align) {
  88         *align = MAX(get_allocation_granularity(), getpagesize());
  89     }
  90     return ptr;
  91 }
  92
  93 void qemu_vfree(void *ptr)
  94 {
  95     trace_qemu_vfree(ptr);
  96     if (ptr) {
  97         VirtualFree(ptr, 0, MEM_RELEASE);
  98     }
  99 }
 100
 101 void qemu_anon_ram_free(void *ptr, size_t size)
 102 {
 103     trace_qemu_anon_ram_free(ptr, size);
 104     if (ptr) {
 105         VirtualFree(ptr, 0, MEM_RELEASE);
 106     }
 107 }
 108
 109 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 110 /* FIXME: add proper locking */
 111 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 112 {
 113     struct tm *p = gmtime(timep);
 114     memset(result, 0, sizeof(*result));
 115     if (p) {
 116         *result = *p;
 117         p = result;
 118     }
 119     return p;
 120 }
 121
 122 /* FIXME: add proper locking */
 123 struct tm *localtime_r(const time_t *timep, struct tm *result)
 124 {
 125     struct tm *p = localtime(timep);
 126     memset(result, 0, sizeof(*result));
 127     if (p) {
 128         *result = *p;
 129         p = result;
 130     }
 131     return p;
 132 }
 133 #endif /* _POSIX_THREAD_SAFE_FUNCTIONS */
 134
 135 static int socket_error(void)
 136 {
 137     switch (WSAGetLastError()) {
 138     case 0:
 139         return 0;
 140     case WSAEINTR:
 141         return EINTR;
 142     case WSAEINVAL:
 143         return EINVAL;
 144     case WSA_INVALID_HANDLE:
 145         return EBADF;
 146     case WSA_NOT_ENOUGH_MEMORY:
 147         return ENOMEM;
 148     case WSA_INVALID_PARAMETER:
 149         return EINVAL;
 150     case WSAENAMETOOLONG:
 151         return ENAMETOOLONG;
 152     case WSAENOTEMPTY:
 153         return ENOTEMPTY;
 154     case WSAEWOULDBLOCK:
 155          /* not using EWOULDBLOCK as we don't want code to have
 156           * to check both EWOULDBLOCK and EAGAIN */
 157         return EAGAIN;
 158     case WSAEINPROGRESS:
 159         return EINPROGRESS;
 160     case WSAEALREADY:
 161         return EALREADY;
 162     case WSAENOTSOCK:
 163         return ENOTSOCK;
 164     case WSAEDESTADDRREQ:
 165         return EDESTADDRREQ;
 166     case WSAEMSGSIZE:
 167         return EMSGSIZE;
 168     case WSAEPROTOTYPE:
 169         return EPROTOTYPE;
 170     case WSAENOPROTOOPT:
 171         return ENOPROTOOPT;
 172     case WSAEPROTONOSUPPORT:
 173         return EPROTONOSUPPORT;
 174     case WSAEOPNOTSUPP:
 175         return EOPNOTSUPP;
 176     case WSAEAFNOSUPPORT:
 177         return EAFNOSUPPORT;
 178     case WSAEADDRINUSE:
 179         return EADDRINUSE;
 180     case WSAEADDRNOTAVAIL:
 181         return EADDRNOTAVAIL;
 182     case WSAENETDOWN:
 183         return ENETDOWN;
 184     case WSAENETUNREACH:
 185         return ENETUNREACH;
 186     case WSAENETRESET:
 187         return ENETRESET;
 188     case WSAECONNABORTED:
 189         return ECONNABORTED;
 190     case WSAECONNRESET:
 191         return ECONNRESET;
 192     case WSAENOBUFS:
 193         return ENOBUFS;
 194     case WSAEISCONN:
 195         return EISCONN;
 196     case WSAENOTCONN:
 197         return ENOTCONN;
 198     case WSAETIMEDOUT:
 199         return ETIMEDOUT;
 200     case WSAECONNREFUSED:
 201         return ECONNREFUSED;
 202     case WSAELOOP:
 203         return ELOOP;
 204     case WSAEHOSTUNREACH:
 205         return EHOSTUNREACH;
 206     default:
 207         return EIO;
 208     }
 209 }
 210
 211 void qemu_set_block(int fd)
 212 {
 213     unsigned long opt = 0;
 214     WSAEventSelect(fd, NULL, 0);
 215     ioctlsocket(fd, FIONBIO, &opt);
 216 }
 217
 218 int qemu_try_set_nonblock(int fd)
 219 {
 220     unsigned long opt = 1;
 221     if (ioctlsocket(fd, FIONBIO, &opt) != NO_ERROR) {
 222         return -socket_error();
 223     }
 224     qemu_fd_register(fd);
 225     return 0;
 226 }
 227
 228 void qemu_set_nonblock(int fd)
 229 {
 230     (void)qemu_try_set_nonblock(fd);
 231 }
 232
 233 int socket_set_fast_reuse(int fd)
 234 {
 235     /* Enabling the reuse of an endpoint that was used by a socket still in
 236      * TIME_WAIT state is usually performed by setting SO_REUSEADDR. On Windows
 237      * fast reuse is the default and SO_REUSEADDR does strange things. So we
 238      * don't have to do anything here. More info can be found at:
 239      * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx */
 240     return 0;
 241 }
 242
 243 int inet_aton(const char *cp, struct in_addr *ia)
 244 {
 245     uint32_t addr = inet_addr(cp);
 246     if (addr == 0xffffffff) {
 247         return 0;
 248     }
 249     ia->s_addr = addr;
 250     return 1;
 251 }
 252
 253 void qemu_set_cloexec(int fd)
 254 {
 255 }
 256
 257 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 258 #define _W32_FT_OFFSET (116444736000000000ULL)
 259
 260 int qemu_gettimeofday(qemu_timeval *tp)
 261 {
 262   union {
 263     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 264     FILETIME ft;
 265   }  _now;
 266
 267   if(tp) {
 268       GetSystemTimeAsFileTime (&_now.ft);
 269       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 270       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 271   }
 272   /* Always return 0 as per Open Group Base Specifications Issue 6.
 273      Do not set errno on error.  */
 274   return 0;
 275 }
 276
 277 int qemu_get_thread_id(void)
 278 {
 279     return GetCurrentThreadId();
 280 }
 281
 282 char *
 283 qemu_get_local_state_pathname(const char *relative_pathname)
 284 {
 285     HRESULT result;
 286     char base_path[MAX_PATH+1] = "";
 287
 288     result = SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA, NULL,
 289                              /* SHGFP_TYPE_CURRENT */ 0, base_path);
 290     if (result != S_OK) {
 291         /* misconfigured environment */
 292         g_critical("CSIDL_COMMON_APPDATA unavailable: %ld", (long)result);
 293         abort();
 294     }
 295     return g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", base_path,
 296                            relative_pathname);
 297 }
 298
 299 void qemu_set_tty_echo(int fd, bool echo)
 300 {
 301     HANDLE handle = (HANDLE)_get_osfhandle(fd);
 302     DWORD dwMode = 0;
 303
 304     if (handle == INVALID_HANDLE_VALUE) {
 305         return;
 306     }
 307
 308     GetConsoleMode(handle, &dwMode);
 309
 310     if (echo) {
 311         SetConsoleMode(handle, dwMode | ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT);
 312     } else {
 313         SetConsoleMode(handle,
 314                        dwMode & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT));
 315     }
 316 }
 317
 318 static const char *exec_dir;
 319
 320 void qemu_init_exec_dir(const char *argv0)
 321 {
 322
 323     char *p;
 324     char buf[MAX_PATH];
 325     DWORD len;
 326
 327     if (exec_dir) {
 328         return;
 329     }
 330
 331     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
 332     if (len == 0) {
 333         return;
 334     }
 335
 336     buf[len] = 0;
 337     p = buf + len - 1;
 338     while (p != buf && *p != '\\') {
 339         p--;
 340     }
 341     *p = 0;
 342     if (access(buf, R_OK) == 0) {
 343         exec_dir = g_strdup(buf);
 344     } else {
 345         exec_dir = CONFIG_BINDIR;
 346     }
 347 }
 348
 349 const char *qemu_get_exec_dir(void)
 350 {
 351     return exec_dir;
 352 }
 353
 354 #if !GLIB_CHECK_VERSION(2, 50, 0)
 355 /*
 356  * The original implementation of g_poll from glib has a problem on Windows
 357  * when using timeouts < 10 ms.
 358  *
 359  * Whenever g_poll is called with timeout < 10 ms, it does a quick poll instead
 360  * of wait. This causes significant performance degradation of QEMU.
 361  *
 362  * The following code is a copy of the original code from glib/gpoll.c
 363  * (glib commit 20f4d1820b8d4d0fc4447188e33efffd6d4a88d8 from 2014-02-19).
 364  * Some debug code was removed and the code was reformatted.
 365  * All other code modifications are marked with 'QEMU'.
 366  */
 367
 368 /*
 369  * gpoll.c: poll(2) abstraction
 370  * Copyright 1998 Owen Taylor
 371  * Copyright 2008 Red Hat, Inc.
 372  *
 373  * This library is free software; you can redistribute it and/or
 374  * modify it under the terms of the GNU Lesser General Public
 375  * License as published by the Free Software Foundation; either
 376  * version 2 of the License, or (at your option) any later version.
 377  *
 378  * This library is distributed in the hope that it will be useful,
 379  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 380  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 381  * Lesser General Public License for more details.
 382  *
 383  * You should have received a copy of the GNU Lesser General Public
 384  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 385  */
 386
 387 static int poll_rest(gboolean poll_msgs, HANDLE *handles, gint nhandles,
 388                      GPollFD *fds, guint nfds, gint timeout)
 389 {
 390     DWORD ready;
 391     GPollFD *f;
 392     int recursed_result;
 393
 394     if (poll_msgs) {
 395         /* Wait for either messages or handles
 396          * -> Use MsgWaitForMultipleObjectsEx
 397          */
 398         ready = MsgWaitForMultipleObjectsEx(nhandles, handles, timeout,
 399                                             QS_ALLINPUT, MWMO_ALERTABLE);
 400
 401         if (ready == WAIT_FAILED) {
 402             gchar *emsg = g_win32_error_message(GetLastError());
 403             g_warning("MsgWaitForMultipleObjectsEx failed: %s", emsg);
 404             g_free(emsg);
 405         }
 406     } else if (nhandles == 0) {
 407         /* No handles to wait for, just the timeout */
 408         if (timeout == INFINITE) {
 409             ready = WAIT_FAILED;
 410         } else {
 411             SleepEx(timeout, TRUE);
 412             ready = WAIT_TIMEOUT;
 413         }
 414     } else {
 415         /* Wait for just handles
 416          * -> Use WaitForMultipleObjectsEx
 417          */
 418         ready =
 419             WaitForMultipleObjectsEx(nhandles, handles, FALSE, timeout, TRUE);
 420         if (ready == WAIT_FAILED) {
 421             gchar *emsg = g_win32_error_message(GetLastError());
 422             g_warning("WaitForMultipleObjectsEx failed: %s", emsg);
 423             g_free(emsg);
 424         }
 425     }
 426
 427     if (ready == WAIT_FAILED) {
 428         return -1;
 429     } else if (ready == WAIT_TIMEOUT || ready == WAIT_IO_COMPLETION) {
 430         return 0;
 431     } else if (poll_msgs && ready == WAIT_OBJECT_0 + nhandles) {
 432         for (f = fds; f < &fds[nfds]; ++f) {
 433             if (f->fd == G_WIN32_MSG_HANDLE && f->events & G_IO_IN) {
 434                 f->revents |= G_IO_IN;
 435             }
 436         }
 437
 438         /* If we have a timeout, or no handles to poll, be satisfied
 439          * with just noticing we have messages waiting.
 440          */
 441         if (timeout != 0 || nhandles == 0) {
 442             return 1;
 443         }
 444
 445         /* If no timeout and handles to poll, recurse to poll them,
 446          * too.
 447          */
 448         recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
 449         return (recursed_result == -1) ? -1 : 1 + recursed_result;
 450     } else if (/* QEMU: removed the following unneeded statement which causes
 451                 * a compiler warning: ready >= WAIT_OBJECT_0 && */
 452                ready < WAIT_OBJECT_0 + nhandles) {
 453         for (f = fds; f < &fds[nfds]; ++f) {
 454             if ((HANDLE) f->fd == handles[ready - WAIT_OBJECT_0]) {
 455                 f->revents = f->events;
 456             }
 457         }
 458
 459         /* If no timeout and polling several handles, recurse to poll
 460          * the rest of them.
 461          */
 462         if (timeout == 0 && nhandles > 1) {
 463             /* Remove the handle that fired */
 464             int i;
 465             for (i = ready - WAIT_OBJECT_0 + 1; i < nhandles; i++) {
 466                 handles[i-1] = handles[i];
 467             }
 468             nhandles--;
 469             recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
 470             return (recursed_result == -1) ? -1 : 1 + recursed_result;
 471         }
 472         return 1;
 473     }
 474
 475     return 0;
 476 }
 477
 478 gint g_poll(GPollFD *fds, guint nfds, gint timeout)
 479 {
 480     HANDLE handles[MAXIMUM_WAIT_OBJECTS];
 481     gboolean poll_msgs = FALSE;
 482     GPollFD *f;
 483     gint nhandles = 0;
 484     int retval;
 485
 486     for (f = fds; f < &fds[nfds]; ++f) {
 487         if (f->fd == G_WIN32_MSG_HANDLE && (f->events & G_IO_IN)) {
 488             poll_msgs = TRUE;
 489         } else if (f->fd > 0) {
 490             /* Don't add the same handle several times into the array, as
 491              * docs say that is not allowed, even if it actually does seem
 492              * to work.
 493              */
 494             gint i;
 495
 496             for (i = 0; i < nhandles; i++) {
 497                 if (handles[i] == (HANDLE) f->fd) {
 498                     break;
 499                 }
 500             }
 501
 502             if (i == nhandles) {
 503                 if (nhandles == MAXIMUM_WAIT_OBJECTS) {
 504                     g_warning("Too many handles to wait for!\n");
 505                     break;
 506                 } else {
 507                     handles[nhandles++] = (HANDLE) f->fd;
 508                 }
 509             }
 510         }
 511     }
 512
 513     for (f = fds; f < &fds[nfds]; ++f) {
 514         f->revents = 0;
 515     }
 516
 517     if (timeout == -1) {
 518         timeout = INFINITE;
 519     }
 520
 521     /* Polling for several things? */
 522     if (nhandles > 1 || (nhandles > 0 && poll_msgs)) {
 523         /* First check if one or several of them are immediately
 524          * available
 525          */
 526         retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, 0);
 527
 528         /* If not, and we have a significant timeout, poll again with
 529          * timeout then. Note that this will return indication for only
 530          * one event, or only for messages. We ignore timeouts less than
 531          * ten milliseconds as they are mostly pointless on Windows, the
 532          * MsgWaitForMultipleObjectsEx() call will timeout right away
 533          * anyway.
 534          *
 535          * Modification for QEMU: replaced timeout >= 10 by timeout > 0.
 536          */
 537         if (retval == 0 && (timeout == INFINITE || timeout > 0)) {
 538             retval = poll_rest(poll_msgs, handles, nhandles,
 539                                fds, nfds, timeout);
 540         }
 541     } else {
 542         /* Just polling for one thing, so no need to check first if
 543          * available immediately
 544          */
 545         retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, timeout);
 546     }
 547
 548     if (retval == -1) {
 549         for (f = fds; f < &fds[nfds]; ++f) {
 550             f->revents = 0;
 551         }
 552     }
 553
 554     return retval;
 555 }
 556 #endif
 557
 558 int getpagesize(void)
 559 {
 560     SYSTEM_INFO system_info;
 561
 562     GetSystemInfo(&system_info);
 563     return system_info.dwPageSize;
 564 }
 565
 566 void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus,
 567                      Error **errp)
 568 {
 569     int i;
 570     size_t pagesize = qemu_real_host_page_size;
 571
 572     memory = (memory + pagesize - 1) & -pagesize;
 573     for (i = 0; i < memory / pagesize; i++) {
 574         memset(area + pagesize * i, 0, 1);
 575     }
 576 }
 577
 578 char *qemu_get_pid_name(pid_t pid)
 579 {
 580     /* XXX Implement me */
 581     abort();
 582 }
 583
 584
 585 pid_t qemu_fork(Error **errp)
 586 {
 587     errno = ENOSYS;
 588     error_setg_errno(errp, errno,
 589                      "cannot fork child process");
 590     return -1;
 591 }
 592
 593
 594 #undef connect
 595 int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
 596                       socklen_t addrlen)
 597 {
 598     int ret;
 599     ret = connect(sockfd, addr, addrlen);
 600     if (ret < 0) {
 601         if (WSAGetLastError() == WSAEWOULDBLOCK) {
 602             errno = EINPROGRESS;
 603         } else {
 604             errno = socket_error();
 605         }
 606     }
 607     return ret;
 608 }
 609
 610
 611 #undef listen
 612 int qemu_listen_wrap(int sockfd, int backlog)
 613 {
 614     int ret;
 615     ret = listen(sockfd, backlog);
 616     if (ret < 0) {
 617         errno = socket_error();
 618     }
 619     return ret;
 620 }
 621
 622
 623 #undef bind
 624 int qemu_bind_wrap(int sockfd, const struct sockaddr *addr,
 625                    socklen_t addrlen)
 626 {
 627     int ret;
 628     ret = bind(sockfd, addr, addrlen);
 629     if (ret < 0) {
 630         errno = socket_error();
 631     }
 632     return ret;
 633 }
 634
 635
 636 #undef socket
 637 int qemu_socket_wrap(int domain, int type, int protocol)
 638 {
 639     int ret;
 640     ret = socket(domain, type, protocol);
 641     if (ret < 0) {
 642         errno = socket_error();
 643     }
 644     return ret;
 645 }
 646
 647
 648 #undef accept
 649 int qemu_accept_wrap(int sockfd, struct sockaddr *addr,
 650                      socklen_t *addrlen)
 651 {
 652     int ret;
 653     ret = accept(sockfd, addr, addrlen);
 654     if (ret < 0) {
 655         errno = socket_error();
 656     }
 657     return ret;
 658 }
 659
 660
 661 #undef shutdown
 662 int qemu_shutdown_wrap(int sockfd, int how)
 663 {
 664     int ret;
 665     ret = shutdown(sockfd, how);
 666     if (ret < 0) {
 667         errno = socket_error();
 668     }
 669     return ret;
 670 }
 671
 672
 673 #undef ioctlsocket
 674 int qemu_ioctlsocket_wrap(int fd, int req, void *val)
 675 {
 676     int ret;
 677     ret = ioctlsocket(fd, req, val);
 678     if (ret < 0) {
 679         errno = socket_error();
 680     }
 681     return ret;
 682 }
 683
 684
 685 #undef closesocket
 686 int qemu_closesocket_wrap(int fd)
 687 {
 688     int ret;
 689     ret = closesocket(fd);
 690     if (ret < 0) {
 691         errno = socket_error();
 692     }
 693     return ret;
 694 }
 695
 696
 697 #undef getsockopt
 698 int qemu_getsockopt_wrap(int sockfd, int level, int optname,
 699                          void *optval, socklen_t *optlen)
 700 {
 701     int ret;
 702     ret = getsockopt(sockfd, level, optname, optval, optlen);
 703     if (ret < 0) {
 704         errno = socket_error();
 705     }
 706     return ret;
 707 }
 708
 709
 710 #undef setsockopt
 711 int qemu_setsockopt_wrap(int sockfd, int level, int optname,
 712                          const void *optval, socklen_t optlen)
 713 {
 714     int ret;
 715     ret = setsockopt(sockfd, level, optname, optval, optlen);
 716     if (ret < 0) {
 717         errno = socket_error();
 718     }
 719     return ret;
 720 }
 721
 722
 723 #undef getpeername
 724 int qemu_getpeername_wrap(int sockfd, struct sockaddr *addr,
 725                           socklen_t *addrlen)
 726 {
 727     int ret;
 728     ret = getpeername(sockfd, addr, addrlen);
 729     if (ret < 0) {
 730         errno = socket_error();
 731     }
 732     return ret;
 733 }
 734
 735
 736 #undef getsockname
 737 int qemu_getsockname_wrap(int sockfd, struct sockaddr *addr,
 738                           socklen_t *addrlen)
 739 {
 740     int ret;
 741     ret = getsockname(sockfd, addr, addrlen);
 742     if (ret < 0) {
 743         errno = socket_error();
 744     }
 745     return ret;
 746 }
 747
 748
 749 #undef send
 750 ssize_t qemu_send_wrap(int sockfd, const void *buf, size_t len, int flags)
 751 {
 752     int ret;
 753     ret = send(sockfd, buf, len, flags);
 754     if (ret < 0) {
 755         errno = socket_error();
 756     }
 757     return ret;
 758 }
 759
 760
 761 #undef sendto
 762 ssize_t qemu_sendto_wrap(int sockfd, const void *buf, size_t len, int flags,
 763                          const struct sockaddr *addr, socklen_t addrlen)
 764 {
 765     int ret;
 766     ret = sendto(sockfd, buf, len, flags, addr, addrlen);
 767     if (ret < 0) {
 768         errno = socket_error();
 769     }
 770     return ret;
 771 }
 772
 773
 774 #undef recv
 775 ssize_t qemu_recv_wrap(int sockfd, void *buf, size_t len, int flags)
 776 {
 777     int ret;
 778     ret = recv(sockfd, buf, len, flags);
 779     if (ret < 0) {
 780         errno = socket_error();
 781     }
 782     return ret;
 783 }
 784
 785
 786 #undef recvfrom
 787 ssize_t qemu_recvfrom_wrap(int sockfd, void *buf, size_t len, int flags,
 788                            struct sockaddr *addr, socklen_t *addrlen)
 789 {
 790     int ret;
 791     ret = recvfrom(sockfd, buf, len, flags, addr, addrlen);
 792     if (ret < 0) {
 793         errno = socket_error();
 794     }
 795     return ret;
 796 }
 797
 798 bool qemu_write_pidfile(const char *filename, Error **errp)
 799 {
 800     char buffer[128];
 801     int len;
 802     HANDLE file;
 803     OVERLAPPED overlap;
 804     BOOL ret;
 805     memset(&overlap, 0, sizeof(overlap));
 806
 807     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 808                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 809
 810     if (file == INVALID_HANDLE_VALUE) {
 811         error_setg(errp, "Failed to create PID file");
 812         return false;
 813     }
 814     len = snprintf(buffer, sizeof(buffer), FMT_pid "\n", (pid_t)getpid());
 815     ret = WriteFile(file, (LPCVOID)buffer, (DWORD)len,
 816                     NULL, &overlap);
 817     CloseHandle(file);
 818     if (ret == 0) {
 819         error_setg(errp, "Failed to write PID file");
 820         return false;
 821     }
 822     return true;
 823 }
 824
 825 char *qemu_get_host_name(Error **errp)
 826 {
 827     wchar_t tmp[MAX_COMPUTERNAME_LENGTH + 1];
 828     DWORD size = G_N_ELEMENTS(tmp);
 829
 830     if (GetComputerNameW(tmp, &size) == 0) {
 831         error_setg_win32(errp, GetLastError(), "failed close handle");
 832         return NULL;
 833     }
 834
 835     return g_utf16_to_utf8(tmp, size, NULL, NULL, NULL);
 836 }
 837
 838 size_t qemu_get_host_physmem(void)
 839 {
 840     MEMORYSTATUSEX statex;
 841     statex.dwLength = sizeof(statex);
 842
 843     if (GlobalMemoryStatusEx(&statex)) {
 844         return statex.ullTotalPhys;
 845     }
 846     return 0;
 847 }