#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 */