| 1 | #ifndef _BABELTRACE_COMPAT_SEND_H |
| 2 | #define _BABELTRACE_COMPAT_SEND_H |
| 3 | |
| 4 | /* |
| 5 | * babeltrace/compat/send.h |
| 6 | * |
| 7 | * Copyright (C) 2015 Michael Jeanson <mjeanson@efficios.com> |
| 8 | * |
| 9 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 10 | * of this software and associated documentation files (the "Software"), to deal |
| 11 | * in the Software without restriction, including without limitation the rights |
| 12 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 13 | * copies of the Software, and to permit persons to whom the Software is |
| 14 | * furnished to do so, subject to the following conditions: |
| 15 | * |
| 16 | * The above copyright notice and this permission notice shall be included in |
| 17 | * all copies or substantial portions of the Software. |
| 18 | * |
| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 22 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 23 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 24 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 25 | * SOFTWARE. |
| 26 | */ |
| 27 | |
| 28 | /* |
| 29 | * This wrapper is used on platforms that have no way of ignoring SIGPIPE |
| 30 | * during a send(). Instead, we set the signal action to ignore. This is OK |
| 31 | * in a single-threaded app, but would be problematic in a multi-threaded app |
| 32 | * since sigaction applies to all threads. |
| 33 | */ |
| 34 | |
| 35 | #ifndef MSG_NOSIGNAL |
| 36 | # ifdef SO_NOSIGPIPE |
| 37 | # define MSG_NOSIGNAL SO_NOSIGPIPE |
| 38 | # endif |
| 39 | #endif |
| 40 | |
| 41 | #if defined(MSG_NOSIGNAL) |
| 42 | static inline |
| 43 | ssize_t bt_send_nosigpipe(int fd, const void *buffer, size_t size) |
| 44 | { |
| 45 | return send(fd, buffer, size, MSG_NOSIGNAL); |
| 46 | } |
| 47 | #else |
| 48 | static inline |
| 49 | ssize_t bt_send_nosigpipe(int fd, const void *buffer, size_t size) |
| 50 | { |
| 51 | ssize_t sent; |
| 52 | int saved_err; |
| 53 | struct sigaction act, oldact; |
| 54 | |
| 55 | /* Set SIGPIPE action to ignore and save current signal action */ |
| 56 | act.sa_handler = SIG_IGN; |
| 57 | if (sigaction(SIGPIPE, &act, &oldact)) { |
| 58 | perror("sigaction"); |
| 59 | sent = -1; |
| 60 | goto end; |
| 61 | } |
| 62 | |
| 63 | /* Send and save errno */ |
| 64 | sent = send(fd, buffer, size, 0); |
| 65 | saved_err = errno; |
| 66 | |
| 67 | /* Restore original signal action */ |
| 68 | if (sigaction(SIGPIPE, &oldact, NULL)) { |
| 69 | perror("sigaction"); |
| 70 | sent = -1; |
| 71 | goto end; |
| 72 | } |
| 73 | |
| 74 | /* Restore send() errno */ |
| 75 | errno = saved_err; |
| 76 | end: |
| 77 | return sent; |
| 78 | } |
| 79 | #endif |
| 80 | |
| 81 | #endif /* _BABELTRACE_COMPAT_SEND_H */ |