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