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7d4ab47d 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 | ||
7d4ab47d MJ |
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 */ |