LXR qemu/qemu-coroutine-io.c

   1/*
   2 * Coroutine-aware I/O functions
   3 *
   4 * Copyright (C) 2009-2010 Nippon Telegraph and Telephone Corporation.
   5 * Copyright (c) 2011, Red Hat, Inc.
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a copy
   8 * of this software and associated documentation files (the "Software"), to deal
   9 * in the Software without restriction, including without limitation the rights
  10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 * copies of the Software, and to permit persons to whom the Software is
  12 * furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice shall be included in
  15 * all copies or substantial portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23 * THE SOFTWARE.
  24 */
  25#include "qemu-common.h"
  26#include "qemu_socket.h"
  27#include "qemu-coroutine.h"
  28
  29int coroutine_fn qemu_co_recvv(int sockfd, struct iovec *iov,
  30                               int len, int iov_offset)
  31{
  32    int total = 0;
  33    int ret;
  34    while (len) {
  35        ret = qemu_recvv(sockfd, iov, len, iov_offset + total);
  36        if (ret < 0) {
  37            if (errno == EAGAIN) {
  38                qemu_coroutine_yield();
  39                continue;
  40            }
  41            if (total == 0) {
  42                total = -1;
  43            }
  44            break;
  45        }
  46        if (ret == 0) {
  47            break;
  48        }
  49        total += ret, len -= ret;
  50    }
  51
  52    return total;
  53}
  54
  55int coroutine_fn qemu_co_sendv(int sockfd, struct iovec *iov,
  56                               int len, int iov_offset)
  57{
  58    int total = 0;
  59    int ret;
  60    while (len) {
  61        ret = qemu_sendv(sockfd, iov, len, iov_offset + total);
  62        if (ret < 0) {
  63            if (errno == EAGAIN) {
  64                qemu_coroutine_yield();
  65                continue;
  66            }
  67            if (total == 0) {
  68                total = -1;
  69            }
  70            break;
  71        }
  72        total += ret, len -= ret;
  73    }
  74
  75    return total;
  76}
  77
  78int coroutine_fn qemu_co_recv(int sockfd, void *buf, int len)
  79{
  80    struct iovec iov;
  81
  82    iov.iov_base = buf;
  83    iov.iov_len = len;
  84
  85    return qemu_co_recvv(sockfd, &iov, len, 0);
  86}
  87
  88int coroutine_fn qemu_co_send(int sockfd, void *buf, int len)
  89{
  90    struct iovec iov;
  91
  92    iov.iov_base = buf;
  93    iov.iov_len = len;
  94
  95    return qemu_co_sendv(sockfd, &iov, len, 0);
  96}
  97