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 (at) 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 https://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 */ 41 static void sigpipe_ignore(struct Curl_easy *data, 42 struct sigpipe_ignore *ig) 43 { 44 /* get a local copy of no_signal because the Curl_easy 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 */ 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