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Commit | Line | Data |
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8c5135f9 PB |
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 | */ | |
aafd7584 | 25 | #include "qemu/osdep.h" |
1de7afc9 | 26 | #include "qemu/sockets.h" |
10817bf0 | 27 | #include "qemu/coroutine.h" |
1de7afc9 | 28 | #include "qemu/iov.h" |
6a1751b7 | 29 | #include "qemu/main-loop.h" |
8c5135f9 | 30 | |
2fc8ae1d MT |
31 | ssize_t coroutine_fn |
32 | qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt, | |
33 | size_t offset, size_t bytes, bool do_send) | |
8c5135f9 | 34 | { |
2fc8ae1d MT |
35 | size_t done = 0; |
36 | ssize_t ret; | |
37 | while (done < bytes) { | |
25e5e4c7 | 38 | ret = iov_send_recv(sockfd, iov, iov_cnt, |
2fc8ae1d MT |
39 | offset + done, bytes - done, do_send); |
40 | if (ret > 0) { | |
41 | done += ret; | |
42 | } else if (ret < 0) { | |
b16a44e1 | 43 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
8c5135f9 | 44 | qemu_coroutine_yield(); |
2fc8ae1d | 45 | } else if (done == 0) { |
b16a44e1 | 46 | return -errno; |
2fc8ae1d MT |
47 | } else { |
48 | break; | |
8c5135f9 | 49 | } |
2fc8ae1d MT |
50 | } else if (ret == 0 && !do_send) { |
51 | /* write (send) should never return 0. | |
52 | * read (recv) returns 0 for end-of-file (-data). | |
53 | * In both cases there's little point retrying, | |
54 | * but we do for write anyway, just in case */ | |
8c5135f9 PB |
55 | break; |
56 | } | |
8c5135f9 | 57 | } |
2fc8ae1d | 58 | return done; |
8c5135f9 PB |
59 | } |
60 | ||
2fc8ae1d MT |
61 | ssize_t coroutine_fn |
62 | qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send) | |
8c5135f9 | 63 | { |
2fc8ae1d MT |
64 | struct iovec iov = { .iov_base = buf, .iov_len = bytes }; |
65 | return qemu_co_sendv_recvv(sockfd, &iov, 1, 0, bytes, do_send); | |
8c5135f9 | 66 | } |
9f05d0c3 MH |
67 | |
68 | typedef struct { | |
d154ef37 | 69 | AioContext *ctx; |
9f05d0c3 MH |
70 | Coroutine *co; |
71 | int fd; | |
72 | } FDYieldUntilData; | |
73 | ||
74 | static void fd_coroutine_enter(void *opaque) | |
75 | { | |
76 | FDYieldUntilData *data = opaque; | |
826cc324 SH |
77 | aio_set_fd_handler(data->ctx, data->fd, false, |
78 | NULL, NULL, NULL, NULL, NULL); | |
0b8b8753 | 79 | qemu_coroutine_enter(data->co); |
9f05d0c3 MH |
80 | } |
81 | ||
82 | void coroutine_fn yield_until_fd_readable(int fd) | |
83 | { | |
84 | FDYieldUntilData data; | |
85 | ||
86 | assert(qemu_in_coroutine()); | |
d154ef37 | 87 | data.ctx = qemu_get_current_aio_context(); |
9f05d0c3 MH |
88 | data.co = qemu_coroutine_self(); |
89 | data.fd = fd; | |
d154ef37 | 90 | aio_set_fd_handler( |
826cc324 | 91 | data.ctx, fd, false, fd_coroutine_enter, NULL, NULL, NULL, &data); |
9f05d0c3 MH |
92 | qemu_coroutine_yield(); |
93 | } |