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    1: #ifndef HEADER_CURL_SIGPIPE_H
    2: #define HEADER_CURL_SIGPIPE_H
    3: /***************************************************************************
    4:  *                                  _   _ ____  _
    5:  *  Project                     ___| | | |  _ \| |
    6:  *                             / __| | | | |_) | |
    7:  *                            | (__| |_| |  _ <| |___
    8:  *                             \___|\___/|_| \_\_____|
    9:  *
   10:  * Copyright (C) 1998 - 2019, 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 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) &&        \
   27:   (defined(USE_OPENSSL) || defined(USE_MBEDTLS))
   28: #include <signal.h>
   29: 
   30: struct sigpipe_ignore {
   31:   struct sigaction old_pipe_act;
   32:   bool no_signal;
   33: };
   34: 
   35: #define SIGPIPE_VARIABLE(x) struct sigpipe_ignore x
   36: 
   37: /*
   38:  * sigpipe_ignore() makes sure we ignore SIGPIPE while running libcurl
   39:  * internals, and then sigpipe_restore() will restore the situation when we
   40:  * return from libcurl again.
   41:  */
   42: static void sigpipe_ignore(struct Curl_easy *data,
   43:                            struct sigpipe_ignore *ig)
   44: {
   45:   /* get a local copy of no_signal because the Curl_easy might not be
   46:      around when we restore */
   47:   ig->no_signal = data->set.no_signal;
   48:   if(!data->set.no_signal) {
   49:     struct sigaction action;
   50:     /* first, extract the existing situation */
   51:     memset(&ig->old_pipe_act, 0, sizeof(struct sigaction));
   52:     sigaction(SIGPIPE, NULL, &ig->old_pipe_act);
   53:     action = ig->old_pipe_act;
   54:     /* ignore this signal */
   55:     action.sa_handler = SIG_IGN;
   56:     sigaction(SIGPIPE, &action, NULL);
   57:   }
   58: }
   59: 
   60: /*
   61:  * sigpipe_restore() puts back the outside world's opinion of signal handler
   62:  * and SIGPIPE handling. It MUST only be called after a corresponding
   63:  * sigpipe_ignore() was used.
   64:  */
   65: static void sigpipe_restore(struct sigpipe_ignore *ig)
   66: {
   67:   if(!ig->no_signal)
   68:     /* restore the outside state */
   69:     sigaction(SIGPIPE, &ig->old_pipe_act, NULL);
   70: }
   71: 
   72: #else
   73: /* for systems without sigaction */
   74: #define sigpipe_ignore(x,y) Curl_nop_stmt
   75: #define sigpipe_restore(x)  Curl_nop_stmt
   76: #define SIGPIPE_VARIABLE(x)
   77: #endif
   78: 
   79: #endif /* HEADER_CURL_SIGPIPE_H */