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 CONFIG_LOCALTIME_R
 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 /* CONFIG_LOCALTIME_R */
 134
 135 void qemu_set_block(int fd)
 136 {
 137     unsigned long opt = 0;
 138     WSAEventSelect(fd, NULL, 0);
 139     ioctlsocket(fd, FIONBIO, &opt);
 140 }
 141
 142 void qemu_set_nonblock(int fd)
 143 {
 144     unsigned long opt = 1;
 145     ioctlsocket(fd, FIONBIO, &opt);
 146     qemu_fd_register(fd);
 147 }
 148
 149 int socket_set_fast_reuse(int fd)
 150 {
 151     /* Enabling the reuse of an endpoint that was used by a socket still in
 152      * TIME_WAIT state is usually performed by setting SO_REUSEADDR. On Windows
 153      * fast reuse is the default and SO_REUSEADDR does strange things. So we
 154      * don't have to do anything here. More info can be found at:
 155      * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx */
 156     return 0;
 157 }
 158
 159
 160 static int socket_error(void)
 161 {
 162     switch (WSAGetLastError()) {
 163     case 0:
 164         return 0;
 165     case WSAEINTR:
 166         return EINTR;
 167     case WSAEINVAL:
 168         return EINVAL;
 169     case WSA_INVALID_HANDLE:
 170         return EBADF;
 171     case WSA_NOT_ENOUGH_MEMORY:
 172         return ENOMEM;
 173     case WSA_INVALID_PARAMETER:
 174         return EINVAL;
 175     case WSAENAMETOOLONG:
 176         return ENAMETOOLONG;
 177     case WSAENOTEMPTY:
 178         return ENOTEMPTY;
 179     case WSAEWOULDBLOCK:
 180          /* not using EWOULDBLOCK as we don't want code to have
 181           * to check both EWOULDBLOCK and EAGAIN */
 182         return EAGAIN;
 183     case WSAEINPROGRESS:
 184         return EINPROGRESS;
 185     case WSAEALREADY:
 186         return EALREADY;
 187     case WSAENOTSOCK:
 188         return ENOTSOCK;
 189     case WSAEDESTADDRREQ:
 190         return EDESTADDRREQ;
 191     case WSAEMSGSIZE:
 192         return EMSGSIZE;
 193     case WSAEPROTOTYPE:
 194         return EPROTOTYPE;
 195     case WSAENOPROTOOPT:
 196         return ENOPROTOOPT;
 197     case WSAEPROTONOSUPPORT:
 198         return EPROTONOSUPPORT;
 199     case WSAEOPNOTSUPP:
 200         return EOPNOTSUPP;
 201     case WSAEAFNOSUPPORT:
 202         return EAFNOSUPPORT;
 203     case WSAEADDRINUSE:
 204         return EADDRINUSE;
 205     case WSAEADDRNOTAVAIL:
 206         return EADDRNOTAVAIL;
 207     case WSAENETDOWN:
 208         return ENETDOWN;
 209     case WSAENETUNREACH:
 210         return ENETUNREACH;
 211     case WSAENETRESET:
 212         return ENETRESET;
 213     case WSAECONNABORTED:
 214         return ECONNABORTED;
 215     case WSAECONNRESET:
 216         return ECONNRESET;
 217     case WSAENOBUFS:
 218         return ENOBUFS;
 219     case WSAEISCONN:
 220         return EISCONN;
 221     case WSAENOTCONN:
 222         return ENOTCONN;
 223     case WSAETIMEDOUT:
 224         return ETIMEDOUT;
 225     case WSAECONNREFUSED:
 226         return ECONNREFUSED;
 227     case WSAELOOP:
 228         return ELOOP;
 229     case WSAEHOSTUNREACH:
 230         return EHOSTUNREACH;
 231     default:
 232         return EIO;
 233     }
 234 }
 235
 236 int inet_aton(const char *cp, struct in_addr *ia)
 237 {
 238     uint32_t addr = inet_addr(cp);
 239     if (addr == 0xffffffff) {
 240         return 0;
 241     }
 242     ia->s_addr = addr;
 243     return 1;
 244 }
 245
 246 void qemu_set_cloexec(int fd)
 247 {
 248 }
 249
 250 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 251 #define _W32_FT_OFFSET (116444736000000000ULL)
 252
 253 int qemu_gettimeofday(qemu_timeval *tp)
 254 {
 255   union {
 256     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 257     FILETIME ft;
 258   }  _now;
 259
 260   if(tp) {
 261       GetSystemTimeAsFileTime (&_now.ft);
 262       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 263       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 264   }
 265   /* Always return 0 as per Open Group Base Specifications Issue 6.
 266      Do not set errno on error.  */
 267   return 0;
 268 }
 269
 270 int qemu_get_thread_id(void)
 271 {
 272     return GetCurrentThreadId();
 273 }
 274
 275 char *
 276 qemu_get_local_state_pathname(const char *relative_pathname)
 277 {
 278     HRESULT result;
 279     char base_path[MAX_PATH+1] = "";
 280
 281     result = SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA, NULL,
 282                              /* SHGFP_TYPE_CURRENT */ 0, base_path);
 283     if (result != S_OK) {
 284         /* misconfigured environment */
 285         g_critical("CSIDL_COMMON_APPDATA unavailable: %ld", (long)result);
 286         abort();
 287     }
 288     return g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", base_path,
 289                            relative_pathname);
 290 }
 291
 292 void qemu_set_tty_echo(int fd, bool echo)
 293 {
 294     HANDLE handle = (HANDLE)_get_osfhandle(fd);
 295     DWORD dwMode = 0;
 296
 297     if (handle == INVALID_HANDLE_VALUE) {
 298         return;
 299     }
 300
 301     GetConsoleMode(handle, &dwMode);
 302
 303     if (echo) {
 304         SetConsoleMode(handle, dwMode | ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT);
 305     } else {
 306         SetConsoleMode(handle,
 307                        dwMode & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT));
 308     }
 309 }
 310
 311 static char exec_dir[PATH_MAX];
 312
 313 void qemu_init_exec_dir(const char *argv0)
 314 {
 315
 316     char *p;
 317     char buf[MAX_PATH];
 318     DWORD len;
 319
 320     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
 321     if (len == 0) {
 322         return;
 323     }
 324
 325     buf[len] = 0;
 326     p = buf + len - 1;
 327     while (p != buf && *p != '\\') {
 328         p--;
 329     }
 330     *p = 0;
 331     if (access(buf, R_OK) == 0) {
 332         pstrcpy(exec_dir, sizeof(exec_dir), buf);
 333     }
 334 }
 335
 336 char *qemu_get_exec_dir(void)
 337 {
 338     return g_strdup(exec_dir);
 339 }
 340
 341 #if !GLIB_CHECK_VERSION(2, 50, 0)
 342 /*
 343  * The original implementation of g_poll from glib has a problem on Windows
 344  * when using timeouts < 10 ms.
 345  *
 346  * Whenever g_poll is called with timeout < 10 ms, it does a quick poll instead
 347  * of wait. This causes significant performance degradation of QEMU.
 348  *
 349  * The following code is a copy of the original code from glib/gpoll.c
 350  * (glib commit 20f4d1820b8d4d0fc4447188e33efffd6d4a88d8 from 2014-02-19).
 351  * Some debug code was removed and the code was reformatted.
 352  * All other code modifications are marked with 'QEMU'.
 353  */
 354
 355 /*
 356  * gpoll.c: poll(2) abstraction
 357  * Copyright 1998 Owen Taylor
 358  * Copyright 2008 Red Hat, Inc.
 359  *
 360  * This library is free software; you can redistribute it and/or
 361  * modify it under the terms of the GNU Lesser General Public
 362  * License as published by the Free Software Foundation; either
 363  * version 2 of the License, or (at your option) any later version.
 364  *
 365  * This library is distributed in the hope that it will be useful,
 366  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 367  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 368  * Lesser General Public License for more details.
 369  *
 370  * You should have received a copy of the GNU Lesser General Public
 371  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 372  */
 373
 374 static int poll_rest(gboolean poll_msgs, HANDLE *handles, gint nhandles,
 375                      GPollFD *fds, guint nfds, gint timeout)
 376 {
 377     DWORD ready;
 378     GPollFD *f;
 379     int recursed_result;
 380
 381     if (poll_msgs) {
 382         /* Wait for either messages or handles
 383          * -> Use MsgWaitForMultipleObjectsEx
 384          */
 385         ready = MsgWaitForMultipleObjectsEx(nhandles, handles, timeout,
 386                                             QS_ALLINPUT, MWMO_ALERTABLE);
 387
 388         if (ready == WAIT_FAILED) {
 389             gchar *emsg = g_win32_error_message(GetLastError());
 390             g_warning("MsgWaitForMultipleObjectsEx failed: %s", emsg);
 391             g_free(emsg);
 392         }
 393     } else if (nhandles == 0) {
 394         /* No handles to wait for, just the timeout */
 395         if (timeout == INFINITE) {
 396             ready = WAIT_FAILED;
 397         } else {
 398             SleepEx(timeout, TRUE);
 399             ready = WAIT_TIMEOUT;
 400         }
 401     } else {
 402         /* Wait for just handles
 403          * -> Use WaitForMultipleObjectsEx
 404          */
 405         ready =
 406             WaitForMultipleObjectsEx(nhandles, handles, FALSE, timeout, TRUE);
 407         if (ready == WAIT_FAILED) {
 408             gchar *emsg = g_win32_error_message(GetLastError());
 409             g_warning("WaitForMultipleObjectsEx failed: %s", emsg);
 410             g_free(emsg);
 411         }
 412     }
 413
 414     if (ready == WAIT_FAILED) {
 415         return -1;
 416     } else if (ready == WAIT_TIMEOUT || ready == WAIT_IO_COMPLETION) {
 417         return 0;
 418     } else if (poll_msgs && ready == WAIT_OBJECT_0 + nhandles) {
 419         for (f = fds; f < &fds[nfds]; ++f) {
 420             if (f->fd == G_WIN32_MSG_HANDLE && f->events & G_IO_IN) {
 421                 f->revents |= G_IO_IN;
 422             }
 423         }
 424
 425         /* If we have a timeout, or no handles to poll, be satisfied
 426          * with just noticing we have messages waiting.
 427          */
 428         if (timeout != 0 || nhandles == 0) {
 429             return 1;
 430         }
 431
 432         /* If no timeout and handles to poll, recurse to poll them,
 433          * too.
 434          */
 435         recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
 436         return (recursed_result == -1) ? -1 : 1 + recursed_result;
 437     } else if (/* QEMU: removed the following unneeded statement which causes
 438                 * a compiler warning: ready >= WAIT_OBJECT_0 && */
 439                ready < WAIT_OBJECT_0 + nhandles) {
 440         for (f = fds; f < &fds[nfds]; ++f) {
 441             if ((HANDLE) f->fd == handles[ready - WAIT_OBJECT_0]) {
 442                 f->revents = f->events;
 443             }
 444         }
 445
 446         /* If no timeout and polling several handles, recurse to poll
 447          * the rest of them.
 448          */
 449         if (timeout == 0 && nhandles > 1) {
 450             /* Remove the handle that fired */
 451             int i;
 452             for (i = ready - WAIT_OBJECT_0 + 1; i < nhandles; i++) {
 453                 handles[i-1] = handles[i];
 454             }
 455             nhandles--;
 456             recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0);
 457             return (recursed_result == -1) ? -1 : 1 + recursed_result;
 458         }
 459         return 1;
 460     }
 461
 462     return 0;
 463 }
 464
 465 gint g_poll(GPollFD *fds, guint nfds, gint timeout)
 466 {
 467     HANDLE handles[MAXIMUM_WAIT_OBJECTS];
 468     gboolean poll_msgs = FALSE;
 469     GPollFD *f;
 470     gint nhandles = 0;
 471     int retval;
 472
 473     for (f = fds; f < &fds[nfds]; ++f) {
 474         if (f->fd == G_WIN32_MSG_HANDLE && (f->events & G_IO_IN)) {
 475             poll_msgs = TRUE;
 476         } else if (f->fd > 0) {
 477             /* Don't add the same handle several times into the array, as
 478              * docs say that is not allowed, even if it actually does seem
 479              * to work.
 480              */
 481             gint i;
 482
 483             for (i = 0; i < nhandles; i++) {
 484                 if (handles[i] == (HANDLE) f->fd) {
 485                     break;
 486                 }
 487             }
 488
 489             if (i == nhandles) {
 490                 if (nhandles == MAXIMUM_WAIT_OBJECTS) {
 491                     g_warning("Too many handles to wait for!\n");
 492                     break;
 493                 } else {
 494                     handles[nhandles++] = (HANDLE) f->fd;
 495                 }
 496             }
 497         }
 498     }
 499
 500     for (f = fds; f < &fds[nfds]; ++f) {
 501         f->revents = 0;
 502     }
 503
 504     if (timeout == -1) {
 505         timeout = INFINITE;
 506     }
 507
 508     /* Polling for several things? */
 509     if (nhandles > 1 || (nhandles > 0 && poll_msgs)) {
 510         /* First check if one or several of them are immediately
 511          * available
 512          */
 513         retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, 0);
 514
 515         /* If not, and we have a significant timeout, poll again with
 516          * timeout then. Note that this will return indication for only
 517          * one event, or only for messages. We ignore timeouts less than
 518          * ten milliseconds as they are mostly pointless on Windows, the
 519          * MsgWaitForMultipleObjectsEx() call will timeout right away
 520          * anyway.
 521          *
 522          * Modification for QEMU: replaced timeout >= 10 by timeout > 0.
 523          */
 524         if (retval == 0 && (timeout == INFINITE || timeout > 0)) {
 525             retval = poll_rest(poll_msgs, handles, nhandles,
 526                                fds, nfds, timeout);
 527         }
 528     } else {
 529         /* Just polling for one thing, so no need to check first if
 530          * available immediately
 531          */
 532         retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, timeout);
 533     }
 534
 535     if (retval == -1) {
 536         for (f = fds; f < &fds[nfds]; ++f) {
 537             f->revents = 0;
 538         }
 539     }
 540
 541     return retval;
 542 }
 543 #endif
 544
 545 int getpagesize(void)
 546 {
 547     SYSTEM_INFO system_info;
 548
 549     GetSystemInfo(&system_info);
 550     return system_info.dwPageSize;
 551 }
 552
 553 void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus,
 554                      Error **errp)
 555 {
 556     int i;
 557     size_t pagesize = qemu_real_host_page_size;
 558
 559     memory = (memory + pagesize - 1) & -pagesize;
 560     for (i = 0; i < memory / pagesize; i++) {
 561         memset(area + pagesize * i, 0, 1);
 562     }
 563 }
 564
 565 char *qemu_get_pid_name(pid_t pid)
 566 {
 567     /* XXX Implement me */
 568     abort();
 569 }
 570
 571
 572 pid_t qemu_fork(Error **errp)
 573 {
 574     errno = ENOSYS;
 575     error_setg_errno(errp, errno,
 576                      "cannot fork child process");
 577     return -1;
 578 }
 579
 580
 581 #undef connect
 582 int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
 583                       socklen_t addrlen)
 584 {
 585     int ret;
 586     ret = connect(sockfd, addr, addrlen);
 587     if (ret < 0) {
 588         if (WSAGetLastError() == WSAEWOULDBLOCK) {
 589             errno = EINPROGRESS;
 590         } else {
 591             errno = socket_error();
 592         }
 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 }