/src/CMake/Utilities/cmcurl/lib/sigpipe.h

Source
#ifndef HEADER_CURL_SIGPIPE_H
#define HEADER_CURL_SIGPIPE_H
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/
#include "curl_setup.h"

#if defined(HAVE_SIGACTION) && !defined(USE_SO_NOSIGPIPE)
#include <signal.h>

struct Curl_sigpipe_ctx {
  struct sigaction old_pipe_act;
  BIT(no_signal);
};

static CURL_INLINE void sigpipe_init(struct Curl_sigpipe_ctx *ig)
{
  memset(ig, 0, sizeof(*ig));
  ig->no_signal = TRUE;
}

/*
 * sigpipe_ignore() makes sure we ignore SIGPIPE while running libcurl
 * internals, and then sigpipe_restore() will restore the situation when we
 * return from libcurl again.
 */
static CURL_INLINE void sigpipe_ignore(struct Curl_easy *data,
                                       struct Curl_sigpipe_ctx *ig)
{
  /* get a local copy of no_signal because the Curl_easy might not be
     around when we restore */
  ig->no_signal = data->set.no_signal;
  if(!data->set.no_signal) {
    struct sigaction action;
    /* first, extract the existing situation */
    sigaction(SIGPIPE, NULL, &ig->old_pipe_act);
    action = ig->old_pipe_act;
    /* ignore this signal */
    action.sa_handler = SIG_IGN;
#ifdef SA_SIGINFO
    /* clear SA_SIGINFO flag since we are using sa_handler */
    action.sa_flags &= ~SA_SIGINFO;
#endif
    sigaction(SIGPIPE, &action, NULL);
  }
}

/*
 * sigpipe_restore() puts back the outside world's opinion of signal handler
 * and SIGPIPE handling. It MUST only be called after a corresponding
 * sigpipe_ignore() was used.
 */
static CURL_INLINE void sigpipe_restore(struct Curl_sigpipe_ctx *ig)
{
  if(!ig->no_signal)
    /* restore the outside state */
    sigaction(SIGPIPE, &ig->old_pipe_act, NULL);
}

static CURL_INLINE void sigpipe_apply(struct Curl_easy *data,
                                      struct Curl_sigpipe_ctx *ig)
{
  if(data && (data->set.no_signal != ig->no_signal)) {
    sigpipe_restore(ig);
    sigpipe_ignore(data, ig);
  }
}

#else /* !HAVE_SIGACTION || USE_SO_NOSIGPIPE */
/* for systems without sigaction or where SO_NOSIGPIPE is used. */
#define sigpipe_ignore(x, y) do { (void)(x); (void)(y); } while(0)
#define sigpipe_apply(x, y)  do { (void)(x); (void)(y); } while(0)
#define sigpipe_init(x)      do { (void)(x); } while(0)
#define sigpipe_restore(x)   do { (void)(x); } while(0)

struct Curl_sigpipe_ctx {
  bool dummy;
};

#endif /* else HAVE_SIGACTION && !USE_SO_NOSIGPIPE */

#endif /* HEADER_CURL_SIGPIPE_H */

Line	Count	Source
1		#ifndef HEADER_CURL_SIGPIPE_H
2		#define HEADER_CURL_SIGPIPE_H
3		/***************************************************************************
4		* _ _ ____ _
5		* Project ___\| \| \| \| _ \\| \|
6		* / __\| \| \| \| \|_) \| \|
7		* \| (__\| \|_\| \| _ <\| \|___
8		* \___\|\___/\|_\| \_\_____\|
9		*
10		* Copyright (C) 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.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		* SPDX-License-Identifier: curl
24		*
25		***************************************************************************/
26		#include "curl_setup.h"
27
28		#if defined(HAVE_SIGACTION) && !defined(USE_SO_NOSIGPIPE)
29		#include <signal.h>
30
31		struct Curl_sigpipe_ctx {
32		struct sigaction old_pipe_act;
33		BIT(no_signal);
34		};
35
36		static CURL_INLINE void sigpipe_init(struct Curl_sigpipe_ctx *ig)
37	0	{
38	0	memset(ig, 0, sizeof(*ig));
39	0	ig->no_signal = TRUE;
40	0	} Unexecuted instantiation: easy.c:sigpipe_init Unexecuted instantiation: multi.c:sigpipe_init Unexecuted instantiation: conncache.c:sigpipe_init Unexecuted instantiation: cshutdn.c:sigpipe_init
41
42		/*
43		* sigpipe_ignore() makes sure we ignore SIGPIPE while running libcurl
44		* internals, and then sigpipe_restore() will restore the situation when we
45		* return from libcurl again.
46		*/
47		static CURL_INLINE void sigpipe_ignore(struct Curl_easy *data,
48		struct Curl_sigpipe_ctx *ig)
49	0	{
50		/* get a local copy of no_signal because the Curl_easy might not be
51		around when we restore */
52	0	ig->no_signal = data->set.no_signal;
53	0	if(!data->set.no_signal) {
54	0	struct sigaction action;
55		/* first, extract the existing situation */
56	0	sigaction(SIGPIPE, NULL, &ig->old_pipe_act);
57	0	action = ig->old_pipe_act;
58		/* ignore this signal */
59	0	action.sa_handler = SIG_IGN;
60	0	#ifdef SA_SIGINFO
61		/* clear SA_SIGINFO flag since we are using sa_handler */
62	0	action.sa_flags &= ~SA_SIGINFO;
63	0	#endif
64	0	sigaction(SIGPIPE, &action, NULL);
65	0	}
66	0	} Unexecuted instantiation: easy.c:sigpipe_ignore Unexecuted instantiation: multi.c:sigpipe_ignore Unexecuted instantiation: conncache.c:sigpipe_ignore Unexecuted instantiation: cshutdn.c:sigpipe_ignore
67
68		/*
69		* sigpipe_restore() puts back the outside world's opinion of signal handler
70		* and SIGPIPE handling. It MUST only be called after a corresponding
71		* sigpipe_ignore() was used.
72		*/
73		static CURL_INLINE void sigpipe_restore(struct Curl_sigpipe_ctx *ig)
74	0	{
75	0	if(!ig->no_signal)
76		/* restore the outside state */
77	0	sigaction(SIGPIPE, &ig->old_pipe_act, NULL);
78	0	} Unexecuted instantiation: easy.c:sigpipe_restore Unexecuted instantiation: multi.c:sigpipe_restore Unexecuted instantiation: conncache.c:sigpipe_restore Unexecuted instantiation: cshutdn.c:sigpipe_restore
79
80		static CURL_INLINE void sigpipe_apply(struct Curl_easy *data,
81		struct Curl_sigpipe_ctx *ig)
82	0	{
83	0	if(data && (data->set.no_signal != ig->no_signal)) {
84	0	sigpipe_restore(ig);
85	0	sigpipe_ignore(data, ig);
86	0	}
87	0	} Unexecuted instantiation: easy.c:sigpipe_apply Unexecuted instantiation: multi.c:sigpipe_apply Unexecuted instantiation: conncache.c:sigpipe_apply Unexecuted instantiation: cshutdn.c:sigpipe_apply
88
89		#else /* !HAVE_SIGACTION \|\| USE_SO_NOSIGPIPE */
90		/* for systems without sigaction or where SO_NOSIGPIPE is used. */
91		#define sigpipe_ignore(x, y) do { (void)(x); (void)(y); } while(0)
92		#define sigpipe_apply(x, y) do { (void)(x); (void)(y); } while(0)
93		#define sigpipe_init(x) do { (void)(x); } while(0)
94		#define sigpipe_restore(x) do { (void)(x); } while(0)
95
96		struct Curl_sigpipe_ctx {
97		bool dummy;
98		};
99
100		#endif /* else HAVE_SIGACTION && !USE_SO_NOSIGPIPE */
101
102		#endif /* HEADER_CURL_SIGPIPE_H */

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Created: 2026-04-29 07:01