Merge branch 'for-upstream' of git://repo.or.cz/qemu/agraf
[qemu.git] / 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
29 int 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
55 int 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
78 int 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
88 int 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 }