1// Copyright Antony Polukhin, 2016-2024.
2//
3// Distributed under the Boost Software License, Version 1.0. (See
4// accompanying file LICENSE_1_0.txt or copy at
5// http://www.boost.org/LICENSE_1_0.txt)
6
7#ifndef BOOST_STACKTRACE_DETAIL_SAFE_DUMP_POSIX_IPP
8#define BOOST_STACKTRACE_DETAIL_SAFE_DUMP_POSIX_IPP
9
10#include <boost/config.hpp>
11#ifdef BOOST_HAS_PRAGMA_ONCE
12# pragma once
13#endif
14
15#include <boost/stacktrace/safe_dump_to.hpp>
16
17#include <unistd.h> // ::write
18#include <fcntl.h> // ::open
19#include <sys/stat.h> // S_IWUSR and friends
20
21
22namespace boost { namespace stacktrace { namespace detail {
23
24std::size_t dump(int fd, const native_frame_ptr_t* frames, std::size_t frames_count) noexcept {
25 // We do not retry, because this function must be typically called from signal handler so it's:
26 // * to scary to continue in case of EINTR
27 // * EAGAIN or EWOULDBLOCK may occur only in case of O_NONBLOCK is set for fd,
28 // so it seems that user does not want to block
29 if (::write(fd: fd, buf: frames, n: sizeof(native_frame_ptr_t) * frames_count) == -1) {
30 return 0;
31 }
32
33 return frames_count;
34}
35
36std::size_t dump(const char* file, const native_frame_ptr_t* frames, std::size_t frames_count) noexcept {
37 const int fd = ::open(
38 file: file,
39 O_CREAT | O_WRONLY | O_TRUNC,
40#if defined(S_IWUSR) && defined(S_IRUSR) // Workarounds for some Android OSes
41 S_IWUSR | S_IRUSR
42#elif defined(S_IWRITE) && defined(S_IREAD)
43 S_IWRITE | S_IREAD
44#else
45 0
46#endif
47 );
48 if (fd == -1) {
49 return 0;
50 }
51
52 const std::size_t size = boost::stacktrace::detail::dump(fd, frames, frames_count);
53 ::close(fd: fd);
54 return size;
55}
56
57}}} // namespace boost::stacktrace::detail
58
59#endif // BOOST_STACKTRACE_DETAIL_SAFE_DUMP_POSIX_IPP
60

source code of boost/libs/stacktrace/include/boost/stacktrace/detail/safe_dump_posix.ipp