Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 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" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 26 | #include "qemu/sockets.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 27 | #include "block/coroutine.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 28 | #include "qemu/iov.h" |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 29 | |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 30 | ssize_t coroutine_fn |
| 31 | qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt, |
| 32 | size_t offset, size_t bytes, bool do_send) |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 33 | { |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 34 | size_t done = 0; |
| 35 | ssize_t ret; |
| 36 | while (done < bytes) { |
Michael Tokarev | 25e5e4c | 2012-03-14 11:18:54 +0400 | [diff] [blame] | 37 | ret = iov_send_recv(sockfd, iov, iov_cnt, |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 38 | offset + done, bytes - done, do_send); |
| 39 | if (ret > 0) { |
| 40 | done += ret; |
| 41 | } else if (ret < 0) { |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 42 | if (errno == EAGAIN) { |
| 43 | qemu_coroutine_yield(); |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 44 | } else if (done == 0) { |
| 45 | return -1; |
| 46 | } else { |
| 47 | break; |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 48 | } |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 49 | } else if (ret == 0 && !do_send) { |
| 50 | /* write (send) should never return 0. |
| 51 | * read (recv) returns 0 for end-of-file (-data). |
| 52 | * In both cases there's little point retrying, |
| 53 | * but we do for write anyway, just in case */ |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 54 | break; |
| 55 | } |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 56 | } |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 57 | return done; |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 58 | } |
| 59 | |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 60 | ssize_t coroutine_fn |
| 61 | qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send) |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 62 | { |
Michael Tokarev | 2fc8ae1 | 2012-06-07 20:22:46 +0400 | [diff] [blame] | 63 | struct iovec iov = { .iov_base = buf, .iov_len = bytes }; |
| 64 | return qemu_co_sendv_recvv(sockfd, &iov, 1, 0, bytes, do_send); |
Paolo Bonzini | 8c5135f | 2011-09-08 13:46:25 +0200 | [diff] [blame] | 65 | } |