| 1 | #ifndef HEADER_CURL_SIGPIPE_H
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| 2 | #define HEADER_CURL_SIGPIPE_H
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| 3 | /***************************************************************************
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| 4 | * _ _ ____ _
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| 5 | * Project ___| | | | _ \| |
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| 6 | * / __| | | | |_) | |
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| 7 | * | (__| |_| | _ <| |___
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| 8 | * \___|\___/|_| \_\_____|
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| 9 | *
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| 10 | * Copyright (C) Daniel Stenberg, <[email protected]>, et al.
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| 11 | *
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| 12 | * This software is licensed as described in the file COPYING, which
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| 13 | * you should have received as part of this distribution. The terms
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| 14 | * are also available at https://curl.se/docs/copyright.html.
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| 15 | *
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| 16 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 17 | * copies of the Software, and permit persons to whom the Software is
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| 18 | * furnished to do so, under the terms of the COPYING file.
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| 19 | *
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| 20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 21 | * KIND, either express or implied.
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| 22 | *
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| 23 | * SPDX-License-Identifier: curl
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| 24 | *
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| 25 | ***************************************************************************/
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| 26 | #include "curl_setup.h"
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| 27 |
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| 28 | #if defined(HAVE_SIGACTION) && \
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| 29 | (defined(USE_OPENSSL) || defined(USE_MBEDTLS) || defined(USE_WOLFSSL))
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| 30 | #include <signal.h>
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| 31 |
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| 32 | struct sigpipe_ignore {
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| 33 | struct sigaction old_pipe_act;
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| 34 | bool no_signal;
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| 35 | };
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| 36 |
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| 37 | #define SIGPIPE_VARIABLE(x) struct sigpipe_ignore x
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| 38 | #define SIGPIPE_MEMBER(x) struct sigpipe_ignore x
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| 39 |
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| 40 | static void sigpipe_init(struct sigpipe_ignore *ig)
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| 41 | {
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| 42 | memset(ig, 0, sizeof(*ig));
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| 43 | ig->no_signal = TRUE;
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| 44 | }
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| 45 |
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| 46 | /*
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| 47 | * sigpipe_ignore() makes sure we ignore SIGPIPE while running libcurl
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| 48 | * internals, and then sigpipe_restore() will restore the situation when we
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| 49 | * return from libcurl again.
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| 50 | */
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| 51 | static void sigpipe_ignore(struct Curl_easy *data,
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| 52 | struct sigpipe_ignore *ig)
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| 53 | {
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| 54 | /* get a local copy of no_signal because the Curl_easy might not be
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| 55 | around when we restore */
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| 56 | ig->no_signal = data->set.no_signal;
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| 57 | if(!data->set.no_signal) {
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| 58 | struct sigaction action;
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| 59 | /* first, extract the existing situation */
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| 60 | sigaction(SIGPIPE, NULL, &ig->old_pipe_act);
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| 61 | action = ig->old_pipe_act;
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| 62 | /* ignore this signal */
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| 63 | action.sa_handler = SIG_IGN;
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| 64 | sigaction(SIGPIPE, &action, NULL);
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| 65 | }
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| 66 | }
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| 67 |
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| 68 | /*
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| 69 | * sigpipe_restore() puts back the outside world's opinion of signal handler
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| 70 | * and SIGPIPE handling. It MUST only be called after a corresponding
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| 71 | * sigpipe_ignore() was used.
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| 72 | */
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| 73 | static void sigpipe_restore(struct sigpipe_ignore *ig)
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| 74 | {
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| 75 | if(!ig->no_signal)
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| 76 | /* restore the outside state */
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| 77 | sigaction(SIGPIPE, &ig->old_pipe_act, NULL);
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| 78 | }
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| 79 |
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| 80 | static void sigpipe_apply(struct Curl_easy *data,
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| 81 | struct sigpipe_ignore *ig)
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| 82 | {
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| 83 | if(data->set.no_signal != ig->no_signal) {
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| 84 | sigpipe_restore(ig);
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| 85 | sigpipe_ignore(data, ig);
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| 86 | }
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| 87 | }
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| 88 |
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| 89 | #else
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| 90 | /* for systems without sigaction */
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| 91 | #define sigpipe_ignore(x,y) Curl_nop_stmt
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| 92 | #define sigpipe_apply(x,y) Curl_nop_stmt
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| 93 | #define sigpipe_init(x) Curl_nop_stmt
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| 94 | #define sigpipe_restore(x) Curl_nop_stmt
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| 95 | #define SIGPIPE_VARIABLE(x)
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| 96 | #define SIGPIPE_MEMBER(x) bool x
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| 97 | #endif
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| 98 |
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| 99 | #endif /* HEADER_CURL_SIGPIPE_H */
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