GCC Code Coverage Report

Line	Branch	Exec	Source
1			//
2			// Copyright (c) 2022 Vinnie Falco (vinnie.falco@gmail.com)
3			//
4			// Distributed under the Boost Software License, Version 1.0. (See accompanying
5			// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6			//
7			// Official repository: https://github.com/CPPAlliance/http_proto
8			//
9
10			#ifndef BOOST_HTTP_PROTO_IMPL_FILE_POSIX_IPP
11			#define BOOST_HTTP_PROTO_IMPL_FILE_POSIX_IPP
12
13			#include <boost/http_proto/file_posix.hpp>
14
15			#if BOOST_HTTP_PROTO_USE_POSIX_FILE
16
17			#include <boost/core/exchange.hpp>
18			#include <limits>
19			#include <fcntl.h>
20			#include <sys/types.h>
21			#include <sys/uio.h>
22			#include <sys/stat.h>
23			#include <unistd.h>
24			#include <limits.h>
25
26			#if ! defined(BOOST_HTTP_PROTO_NO_POSIX_FADVISE)
27			# if defined(__APPLE__) || (defined(__ANDROID__) && (__ANDROID_API__ < 21))
28			# define BOOST_HTTP_PROTO_NO_POSIX_FADVISE
29			# endif
30			#endif
31
32			#if ! defined(BOOST_HTTP_PROTO_USE_POSIX_FADVISE)
33			# if ! defined(BOOST_HTTP_PROTO_NO_POSIX_FADVISE)
34			# define BOOST_HTTP_PROTO_USE_POSIX_FADVISE 1
35			# else
36			# define BOOST_HTTP_PROTO_USE_POSIX_FADVISE 0
37			# endif
38			#endif
39
40			namespace boost {
41			namespace http_proto {
42
43			int
44		✗	file_posix::
45			native_close(native_handle_type& fd)
46			{
47			/* https://github.com/boostorg/beast/issues/1445
48
49			This function is tuned for Linux / Mac OS:
50
51			* only calls close() once
52			* returns the error directly to the caller
53			* does not loop on EINTR
54
55			If this is incorrect for the platform, then the
56			caller will need to implement their own type
57			meeting the File requirements and use the correct
58			behavior.
59
60			See:
61			http://man7.org/linux/man-pages/man2/close.2.html
62			*/
63		✗	int ev = 0;
64		✗	if(fd != -1)
65			{
66		✗	if(::close(fd) != 0)
67		✗	ev = errno;
68		✗	fd = -1;
69			}
70		✗	return ev;
71			}
72
73		✗	file_posix::
74		✗	~file_posix()
75			{
76		✗	native_close(fd_);
77			}
78
79		✗	file_posix::
80			file_posix(
81		✗	file_posix&& other) noexcept
82		✗	: fd_(boost::exchange(other.fd_, -1))
83			{
84			}
85
86			file_posix&
87		✗	file_posix::
88			operator=(
89			file_posix&& other) noexcept
90			{
91		✗	if(&other == this)
92		✗	return *this;
93		✗	native_close(fd_);
94		✗	fd_ = other.fd_;
95		✗	other.fd_ = -1;
96		✗	return *this;
97			}
98
99			void
100		✗	file_posix::
101			native_handle(native_handle_type fd)
102			{
103		✗	native_close(fd_);
104		✗	fd_ = fd;
105			}
106
107			void
108		✗	file_posix::
109			close(
110			system::error_code& ec)
111			{
112		✗	auto const ev = native_close(fd_);
113		✗	if(ev)
114		✗	ec.assign(ev,
115			system::system_category());
116			else
117		✗	ec = {};
118			}
119
120			void
121		✗	file_posix::
122			open(char const* path, file_mode mode, system::error_code& ec)
123			{
124		✗	auto const ev = native_close(fd_);
125		✗	if(ev)
126		✗	ec.assign(ev,
127			system::system_category());
128			else
129		✗	ec = {};
130
131		✗	int f = 0;
132			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
133		✗	int advise = 0;
134			#endif
135		✗	switch(mode)
136			{
137		✗	default:
138			case file_mode::read:
139		✗	f = O_RDONLY;
140			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
141		✗	advise = POSIX_FADV_RANDOM;
142			#endif
143		✗	break;
144		✗	case file_mode::scan:
145		✗	f = O_RDONLY;
146			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
147		✗	advise = POSIX_FADV_SEQUENTIAL;
148			#endif
149		✗	break;
150
151		✗	case file_mode::write:
152		✗	f = O_RDWR | O_CREAT | O_TRUNC;
153			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
154		✗	advise = POSIX_FADV_RANDOM;
155			#endif
156		✗	break;
157
158		✗	case file_mode::write_new:
159		✗	f = O_RDWR | O_CREAT | O_EXCL;
160			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
161		✗	advise = POSIX_FADV_RANDOM;
162			#endif
163		✗	break;
164
165		✗	case file_mode::write_existing:
166		✗	f = O_RDWR | O_EXCL;
167			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
168		✗	advise = POSIX_FADV_RANDOM;
169			#endif
170		✗	break;
171
172		✗	case file_mode::append:
173		✗	f = O_WRONLY | O_CREAT | O_APPEND;
174			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
175		✗	advise = POSIX_FADV_SEQUENTIAL;
176			#endif
177		✗	break;
178
179		✗	case file_mode::append_existing:
180		✗	f = O_WRONLY | O_APPEND;
181			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
182		✗	advise = POSIX_FADV_SEQUENTIAL;
183			#endif
184		✗	break;
185			}
186			for(;;)
187			{
188		✗	fd_ = ::open(path, f, 0644);
189		✗	if(fd_ != -1)
190		✗	break;
191		✗	auto const ev = errno;
192		✗	if(ev != EINTR)
193			{
194		✗	ec.assign(ev,
195			system::system_category());
196		✗	return;
197			}
198			}
199			#if BOOST_HTTP_PROTO_USE_POSIX_FADVISE
200		✗	if(::posix_fadvise(fd_, 0, 0, advise))
201			{
202		✗	auto const ev = errno;
203		✗	native_close(fd_);
204		✗	ec.assign(ev,
205			system::system_category());
206		✗	return;
207			}
208			#endif
209		✗	ec = {};
210			}
211
212			std::uint64_t
213		✗	file_posix::
214			size(
215			system::error_code& ec) const
216			{
217		✗	if(fd_ == -1)
218			{
219			ec = make_error_code(
220		✗	system::errc::bad_file_descriptor);
221		✗	return 0;
222			}
223			struct stat st;
224		✗	if(::fstat(fd_, &st) != 0)
225			{
226		✗	ec.assign(errno,
227			system::system_category());
228		✗	return 0;
229			}
230		✗	ec = {};
231		✗	return st.st_size;
232			}
233
234			std::uint64_t
235		✗	file_posix::
236			pos(
237			system::error_code& ec) const
238			{
239		✗	if(fd_ == -1)
240			{
241			ec = make_error_code(
242		✗	system::errc::bad_file_descriptor);
243		✗	return 0;
244			}
245		✗	auto const result = ::lseek(fd_, 0, SEEK_CUR);
246		✗	if(result == (off_t)-1)
247			{
248		✗	ec.assign(errno,
249			system::system_category());
250		✗	return 0;
251			}
252		✗	ec = {};
253		✗	return result;
254			}
255
256			void
257		✗	file_posix::
258			seek(std::uint64_t offset,
259			system::error_code& ec)
260			{
261		✗	if(fd_ == -1)
262			{
263			ec = make_error_code(
264		✗	system::errc::bad_file_descriptor);
265		✗	return;
266			}
267		✗	auto const result = ::lseek(fd_, offset, SEEK_SET);
268		✗	if(result == static_cast<off_t>(-1))
269			{
270		✗	ec.assign(errno,
271			system::system_category());
272		✗	return;
273			}
274		✗	ec = {};
275			}
276
277			std::size_t
278		✗	file_posix::
279			read(void* buffer, std::size_t n,
280			system::error_code& ec) const
281			{
282		✗	if(fd_ == -1)
283			{
284			ec = make_error_code(
285		✗	system::errc::bad_file_descriptor);
286		✗	return 0;
287			}
288		✗	std::size_t nread = 0;
289		✗	while(n > 0)
290			{
291			// <limits> not required to define SSIZE_MAX so we avoid it
292		✗	constexpr auto ssmax =
293			static_cast<std::size_t>((std::numeric_limits<
294			decltype(::read(fd_, buffer, n))>::max)());
295			auto const amount = (std::min)(
296		✗	n, ssmax);
297		✗	auto const result = ::read(fd_, buffer, amount);
298		✗	if(result == -1)
299			{
300		✗	auto const ev = errno;
301		✗	if(ev == EINTR)
302		✗	continue;
303		✗	ec.assign(ev,
304			system::system_category());
305		✗	return nread;
306			}
307		✗	if(result == 0)
308			{
309			// short read
310		✗	return nread;
311			}
312		✗	n -= result;
313		✗	nread += result;
314		✗	buffer = static_cast<char*>(buffer) + result;
315			}
316		✗	return nread;
317			}
318
319			std::size_t
320		✗	file_posix::
321			write(void const* buffer, std::size_t n,
322			system::error_code& ec)
323			{
324		✗	if(fd_ == -1)
325			{
326			ec = make_error_code(
327		✗	system::errc::bad_file_descriptor);
328		✗	return 0;
329			}
330		✗	std::size_t nwritten = 0;
331		✗	while(n > 0)
332			{
333			// <limits> not required to define SSIZE_MAX so we avoid it
334		✗	constexpr auto ssmax =
335			static_cast<std::size_t>((std::numeric_limits<
336			decltype(::write(fd_, buffer, n))>::max)());
337			auto const amount = (std::min)(
338		✗	n, ssmax);
339		✗	auto const result = ::write(fd_, buffer, amount);
340		✗	if(result == -1)
341			{
342		✗	auto const ev = errno;
343		✗	if(ev == EINTR)
344		✗	continue;
345		✗	ec.assign(ev,
346			system::system_category());
347		✗	return nwritten;
348			}
349		✗	n -= result;
350		✗	nwritten += result;
351		✗	buffer = static_cast<char const*>(buffer) + result;
352			}
353		✗	return nwritten;
354			}
355
356			} // http_proto
357			} // boost
358
359			#endif
360
361			#endif
362