projects / babeltrace.git / blame
| Commit | Line | Data |
|---|---|---|
| b319430e MJ |
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 | #include <config.h> | |
| 29 | ||
| 30 | /* | |
| 31 | * This wrapper is used on platforms that have no way of ignoring SIGPIPE | |
| 32 | * during a send(). Instead, we set the signal action to ignore. This is OK | |
| 33 | * in a single-threaded app, but would be problematic in a multi-threaded app | |
| 34 | * since sigaction applies to all threads. | |
| 35 | */ | |
| 36 | ||
| 37 | #ifndef MSG_NOSIGNAL | |
| 38 | # ifdef SO_NOSIGPIPE | |
| 39 | # define MSG_NOSIGNAL SO_NOSIGPIPE | |
| 40 | # endif | |
| 41 | #endif | |
| 42 | ||
| 43 | #if defined(MSG_NOSIGNAL) | |
| 44 | static inline | |
| 45 | ssize_t bt_send_nosigpipe(int fd, const void *buffer, size_t size) | |
| 46 | { | |
| 47 | return send(fd, buffer, size, MSG_NOSIGNAL); | |
| 48 | } | |
| 49 | #else | |
| 50 | static inline | |
| 51 | ssize_t bt_send_nosigpipe(int fd, const void *buffer, size_t size) | |
| 52 | { | |
| 53 | ssize_t sent; | |
| 54 | int saved_err; | |
| 55 | struct sigaction act, oldact; | |
| 56 | ||
| 57 | /* Set SIGPIPE action to ignore and save current signal action */ | |
| 58 | act.sa_handler = SIG_IGN; | |
| 59 | if (sigaction(SIGPIPE, &act, &oldact)) { | |
| 60 | perror("sigaction"); | |
| 61 | sent = -1; | |
| 62 | goto end; | |
| 63 | } | |
| 64 | ||
| 65 | /* Send and save errno */ | |
| 66 | sent = send(fd, buffer, size, 0); | |
| 67 | saved_err = errno; | |
| 68 | ||
| 69 | /* Restore original signal action */ | |
| 70 | if (sigaction(SIGPIPE, &oldact, NULL)) { | |
| 71 | perror("sigaction"); | |
| 72 | sent = -1; | |
| 73 | goto end; | |
| 74 | } | |
| 75 | ||
| 76 | /* Restore send() errno */ | |
| 77 | errno = saved_err; | |
| 78 | end: | |
| 79 | return sent; | |
| 80 | } | |
| 81 | #endif | |
| 82 | ||
| 83 | #endif /* _BABELTRACE_COMPAT_SEND_H */ |