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 29struct 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 */ 41static 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 */ 64static 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