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