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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 - 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