1 | #ifndef HEADER_CURL_SIGPIPE_H |
2 | #define |
3 | /*************************************************************************** |
4 | * _ _ ____ _ |
5 | * Project ___| | | | _ \| | |
6 | * / __| | | | |_) | | |
7 | * | (__| |_| | _ <| |___ |
8 | * \___|\___/|_| \_\_____| |
9 | * |
10 | * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al. |
11 | * |
12 | * This software is licensed as described in the file COPYING, which |
13 | * you should have received as part of this distribution. The terms |
14 | * are also available at https://curl.haxx.se/docs/copyright.html. |
15 | * |
16 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
17 | * copies of the Software, and permit persons to whom the Software is |
18 | * furnished to do so, under the terms of the COPYING file. |
19 | * |
20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
21 | * KIND, either express or implied. |
22 | * |
23 | ***************************************************************************/ |
24 | #include "curl_setup.h" |
25 | |
26 | #if defined(HAVE_SIGNAL_H) && defined(HAVE_SIGACTION) && \ |
27 | (defined(USE_OPENSSL) || defined(USE_MBEDTLS)) |
28 | #include <signal.h> |
29 | |
30 | struct sigpipe_ignore { |
31 | struct sigaction old_pipe_act; |
32 | bool no_signal; |
33 | }; |
34 | |
35 | #define SIGPIPE_VARIABLE(x) struct sigpipe_ignore x |
36 | |
37 | /* |
38 | * sigpipe_ignore() makes sure we ignore SIGPIPE while running libcurl |
39 | * internals, and then sigpipe_restore() will restore the situation when we |
40 | * return from libcurl again. |
41 | */ |
42 | static void sigpipe_ignore(struct Curl_easy *data, |
43 | struct sigpipe_ignore *ig) |
44 | { |
45 | /* get a local copy of no_signal because the Curl_easy might not be |
46 | around when we restore */ |
47 | ig->no_signal = data->set.no_signal; |
48 | if(!data->set.no_signal) { |
49 | struct sigaction action; |
50 | /* first, extract the existing situation */ |
51 | memset(&ig->old_pipe_act, 0, sizeof(struct sigaction)); |
52 | sigaction(SIGPIPE, NULL, &ig->old_pipe_act); |
53 | action = ig->old_pipe_act; |
54 | /* ignore this signal */ |
55 | action.sa_handler = SIG_IGN; |
56 | sigaction(SIGPIPE, &action, NULL); |
57 | } |
58 | } |
59 | |
60 | /* |
61 | * sigpipe_restore() puts back the outside world's opinion of signal handler |
62 | * and SIGPIPE handling. It MUST only be called after a corresponding |
63 | * sigpipe_ignore() was used. |
64 | */ |
65 | static void sigpipe_restore(struct sigpipe_ignore *ig) |
66 | { |
67 | if(!ig->no_signal) |
68 | /* restore the outside state */ |
69 | sigaction(SIGPIPE, &ig->old_pipe_act, NULL); |
70 | } |
71 | |
72 | #else |
73 | /* for systems without sigaction */ |
74 | #define sigpipe_ignore(x,y) Curl_nop_stmt |
75 | #define sigpipe_restore(x) Curl_nop_stmt |
76 | #define SIGPIPE_VARIABLE(x) |
77 | #endif |
78 | |
79 | #endif /* HEADER_CURL_SIGPIPE_H */ |
80 | |