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Annotation of embedaddon/curl/lib/sigpipe.h, revision 1.1.1.1

1.1       misho       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 */