Archipelago » qemu

/*

 * Coroutine-aware I/O functions

 *

 * Copyright (C) 2009-2010 Nippon Telegraph and Telephone Corporation.

 * Copyright (c) 2011, Red Hat, Inc.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu-common.h"

#include "qemu_socket.h"

#include "qemu-coroutine.h"

int coroutine_fn qemu_co_recvv(int sockfd, struct iovec *iov,

                               int len, int iov_offset)

{

    int total = 0;

    int ret;

    while (len) {

        ret = qemu_recvv(sockfd, iov, len, iov_offset + total);

        if (ret < 0) {

            if (errno == EAGAIN) {

                qemu_coroutine_yield();

                continue;

            }

            if (total == 0) {

                total = -1;

            }

            break;

        }

        if (ret == 0) {

            break;

        }

        total += ret, len -= ret;

    }

    return total;

}

int coroutine_fn qemu_co_sendv(int sockfd, struct iovec *iov,

                               int len, int iov_offset)

{

    int total = 0;

    int ret;

    while (len) {

        ret = qemu_sendv(sockfd, iov, len, iov_offset + total);

        if (ret < 0) {

            if (errno == EAGAIN) {

                qemu_coroutine_yield();

                continue;

            }

            if (total == 0) {

                total = -1;

            }

            break;

        }

        total += ret, len -= ret;

    }

    return total;

}

int coroutine_fn qemu_co_recv(int sockfd, void *buf, int len)

{

    struct iovec iov;

    iov.iov_base = buf;

    iov.iov_len = len;

    return qemu_co_recvv(sockfd, &iov, len, 0);

}

int coroutine_fn qemu_co_send(int sockfd, void *buf, int len)

{

    struct iovec iov;

    iov.iov_base = buf;

    iov.iov_len = len;

    return qemu_co_sendv(sockfd, &iov, len, 0);

}