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