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1 #ifndef HEADER_CURL_SIGPIPE_H
2 #define HEADER_CURL_SIGPIPE_H
3 /***************************************************************************
4  *                                  _   _ ____  _
5  *  Project                     ___| | | |  _ \| |
6  *                             / __| | | | |_) | |
7  *                            | (__| |_| |  _ <| |___
8  *                             \___|\___/|_| \_\_____|
9  *
10  * Copyright (C) 1998 - 2013, 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 http://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) && defined(USE_OPENSSL)
27 #include <signal.h>
28 
29 struct sigpipe_ignore {
30   struct sigaction old_pipe_act;
31   bool no_signal;
32 };
33 
34 #define SIGPIPE_VARIABLE(x) struct sigpipe_ignore x
35 
36 /*
37  * sigpipe_ignore() makes sure we ignore SIGPIPE while running libcurl
38  * internals, and then sigpipe_restore() will restore the situation when we
39  * return from libcurl again.
40  */
sigpipe_ignore(struct SessionHandle * data,struct sigpipe_ignore * ig)41 static void sigpipe_ignore(struct SessionHandle *data,
42                            struct sigpipe_ignore *ig)
43 {
44   /* get a local copy of no_signal because the SessionHandle might not be
45      around when we restore */
46   ig->no_signal = data->set.no_signal;
47   if(!data->set.no_signal) {
48     struct sigaction action;
49     /* first, extract the existing situation */
50     memset(&ig->old_pipe_act, 0, sizeof(struct sigaction));
51     sigaction(SIGPIPE, NULL, &ig->old_pipe_act);
52     action = ig->old_pipe_act;
53     /* ignore this signal */
54     action.sa_handler = SIG_IGN;
55     sigaction(SIGPIPE, &action, NULL);
56   }
57 }
58 
59 /*
60  * sigpipe_restore() puts back the outside world's opinion of signal handler
61  * and SIGPIPE handling. It MUST only be called after a corresponding
62  * sigpipe_ignore() was used.
63  */
sigpipe_restore(struct sigpipe_ignore * ig)64 static void sigpipe_restore(struct sigpipe_ignore *ig)
65 {
66   if(!ig->no_signal)
67     /* restore the outside state */
68     sigaction(SIGPIPE, &ig->old_pipe_act, NULL);
69 }
70 
71 #else
72 /* for systems without sigaction */
73 #define sigpipe_ignore(x,y) Curl_nop_stmt
74 #define sigpipe_restore(x)  Curl_nop_stmt
75 #define SIGPIPE_VARIABLE(x)
76 #endif
77 
78 #endif /* HEADER_CURL_SIGPIPE_H */
79