66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Network Block Device Common Code
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "nbd-internal.h"
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ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read)
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{
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size_t offset = 0;
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int err;
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if (qemu_in_coroutine()) {
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if (do_read) {
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return qemu_co_recv(fd, buffer, size);
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} else {
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return qemu_co_send(fd, buffer, size);
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}
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}
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while (offset < size) {
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ssize_t len;
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if (do_read) {
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len = qemu_recv(fd, buffer + offset, size - offset, 0);
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} else {
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len = send(fd, buffer + offset, size - offset, 0);
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}
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if (len < 0) {
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err = socket_error();
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/* recoverable error */
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if (err == EINTR || (offset > 0 && (err == EAGAIN || err == EWOULDBLOCK))) {
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continue;
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}
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/* unrecoverable error */
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return -err;
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}
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/* eof */
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if (len == 0) {
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break;
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}
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offset += len;
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}
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return offset;
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}
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