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#ifndef HEADER_CURL_SIGPIPE_H
#define HEADER_CURL_SIGPIPE_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#if defined(HAVE_SIGACTION) && \
(defined(USE_OPENSSL) || defined(USE_MBEDTLS) || defined(USE_WOLFSSL))
#include <signal.h>
struct sigpipe_ignore {
struct sigaction old_pipe_act;
bool no_signal;
};
#define SIGPIPE_VARIABLE(x) struct sigpipe_ignore x
#define SIGPIPE_MEMBER(x) struct sigpipe_ignore x
static void sigpipe_init(struct sigpipe_ignore *ig)
{
memset(ig, 0, sizeof(*ig));
ig->no_signal = TRUE;
}
/*
* sigpipe_ignore() makes sure we ignore SIGPIPE while running libcurl
* internals, and then sigpipe_restore() will restore the situation when we
* return from libcurl again.
*/
static void sigpipe_ignore(struct Curl_easy *data,
struct sigpipe_ignore *ig)
{
/* get a local copy of no_signal because the Curl_easy might not be
around when we restore */
ig->no_signal = data->set.no_signal;
if(!data->set.no_signal) {
struct sigaction action;
/* first, extract the existing situation */
sigaction(SIGPIPE, NULL, &ig->old_pipe_act);
action = ig->old_pipe_act;
/* ignore this signal */
action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &action, NULL);
}
}
/*
* sigpipe_restore() puts back the outside world's opinion of signal handler
* and SIGPIPE handling. It MUST only be called after a corresponding
* sigpipe_ignore() was used.
*/
static void sigpipe_restore(struct sigpipe_ignore *ig)
{
if(!ig->no_signal)
/* restore the outside state */
sigaction(SIGPIPE, &ig->old_pipe_act, NULL);
}
static void sigpipe_apply(struct Curl_easy *data,
struct sigpipe_ignore *ig)
{
if(data->set.no_signal != ig->no_signal) {
sigpipe_restore(ig);
sigpipe_ignore(data, ig);
}
}
#else
/* for systems without sigaction */
#define sigpipe_ignore(x,y) Curl_nop_stmt
#define sigpipe_apply(x,y) Curl_nop_stmt
#define sigpipe_init(x) Curl_nop_stmt
#define sigpipe_restore(x) Curl_nop_stmt
#define SIGPIPE_VARIABLE(x)
#define SIGPIPE_MEMBER(x) bool x
#endif
#endif /* HEADER_CURL_SIGPIPE_H */
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