qemu/util/oslib-win32.c
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   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
  46void *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
  55void *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
  67void *qemu_memalign(size_t alignment, size_t size)
  68{
  69    return qemu_oom_check(qemu_try_memalign(alignment, size));
  70}
  71
  72static int get_allocation_granularity(void)
  73{
  74    SYSTEM_INFO system_info;
  75
  76    GetSystemInfo(&system_info);
  77    return system_info.dwAllocationGranularity;
  78}
  79
  80void *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
  93void qemu_vfree(void *ptr)
  94{
  95    trace_qemu_vfree(ptr);
  96    if (ptr) {
  97        VirtualFree(ptr, 0, MEM_RELEASE);
  98    }
  99}
 100
 101void 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 */
 111struct 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 */
 123struct 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
 135void qemu_set_block(int fd)
 136{
 137    unsigned long opt = 0;
 138    WSAEventSelect(fd, NULL, 0);
 139    ioctlsocket(fd, FIONBIO, &opt);
 140}
 141
 142void qemu_set_nonblock(int fd)
 143{
 144    unsigned long opt = 1;
 145    ioctlsocket(fd, FIONBIO, &opt);
 146    qemu_fd_register(fd);
 147}
 148
 149int 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
 160static 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
 236int 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
 246void 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
 253int 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
 270int qemu_get_thread_id(void)
 271{
 272    return GetCurrentThreadId();
 273}
 274
 275char *
 276qemu_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
 292void 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
 311static char exec_dir[PATH_MAX];
 312
 313void 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
 336char *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
 374static 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
 465gint 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
 545int getpagesize(void)
 546{
 547    SYSTEM_INFO system_info;
 548
 549    GetSystemInfo(&system_info);
 550    return system_info.dwPageSize;
 551}
 552
 553void 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
 565char *qemu_get_pid_name(pid_t pid)
 566{
 567    /* XXX Implement me */
 568    abort();
 569}
 570
 571
 572pid_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
 582int 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
 599int 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
 611int 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
 624int 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
 636int 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
 649int 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
 661int 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
 673int 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
 685int 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
 698int 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
 711int 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
 724int 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
 737ssize_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
 749ssize_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
 762ssize_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
 774ssize_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
 785bool 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}
 811