libstdc++-v3/src/c++11/system_error.cc

   1 // <system_error> implementation file
   2
   3 // Copyright (C) 2007-2020 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25
  26 #define _GLIBCXX_USE_CXX11_ABI 1
  27 #define __sso_string __sso_stringxxx
  28 #include <cstring>
  29 #include <system_error>
  30 #include <bits/functexcept.h>
  31 #include <limits>
  32 #include <errno.h>
  33 #undef __sso_string
  34
  35 namespace
  36 {
  37   using std::string;
  38
  39   struct generic_error_category : public std::error_category
  40   {
  41     virtual const char*
  42     name() const noexcept
  43     { return "generic"; }
  44
  45     _GLIBCXX_DEFAULT_ABI_TAG
  46     virtual string
  47     message(int i) const
  48     {
  49       // XXX locale issues: how does one get or set loc.
  50       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  51       return string(strerror(i));
  52     }
  53   };
  54
  55   struct system_error_category : public std::error_category
  56   {
  57     virtual const char*
  58     name() const noexcept
  59     { return "system"; }
  60
  61     _GLIBCXX_DEFAULT_ABI_TAG
  62     virtual string
  63     message(int i) const
  64     {
  65       // XXX locale issues: how does one get or set loc.
  66       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  67       return string(strerror(i));
  68     }
  69
  70     virtual std::error_condition
  71     default_error_condition(int ev) const noexcept
  72     {
  73       switch (ev)
  74       {
  75       // List of errno macros from [cerrno.syn].
  76       // C11 only defines EDOM, EILSEQ and ERANGE, the rest are from POSIX.
  77       // They expand to integer constant expressions with type int,
  78       // and distinct positive values, suitable for use in #if directives.
  79       // POSIX adds more macros (but they're not defined on all targets,
  80       // see config/os/*/error_constants.h), and POSIX allows
  81       // EAGAIN == EWOULDBLOCK and ENOTSUP == EOPNOTSUPP.
  82
  83 #ifdef E2BIG
  84       case E2BIG:
  85 #endif
  86 #ifdef EACCES
  87       case EACCES:
  88 #endif
  89 #ifdef EADDRINUSE
  90       case EADDRINUSE:
  91 #endif
  92 #ifdef EADDRNOTAVAIL
  93       case EADDRNOTAVAIL:
  94 #endif
  95 #ifdef EAFNOSUPPORT
  96       case EAFNOSUPPORT:
  97 #endif
  98 #ifdef EAGAIN
  99       case EAGAIN:
 100 #endif
 101 #ifdef EALREADY
 102       case EALREADY:
 103 #endif
 104 #ifdef EBADF
 105       case EBADF:
 106 #endif
 107 #ifdef EBADMSG
 108       case EBADMSG:
 109 #endif
 110 #ifdef EBUSY
 111       case EBUSY:
 112 #endif
 113 #ifdef ECANCELED
 114       case ECANCELED:
 115 #endif
 116 #ifdef ECHILD
 117       case ECHILD:
 118 #endif
 119 #ifdef ECONNABORTED
 120       case ECONNABORTED:
 121 #endif
 122 #ifdef ECONNREFUSED
 123       case ECONNREFUSED:
 124 #endif
 125 #ifdef ECONNRESET
 126       case ECONNRESET:
 127 #endif
 128 #ifdef EDEADLK
 129       case EDEADLK:
 130 #endif
 131 #ifdef EDESTADDRREQ
 132       case EDESTADDRREQ:
 133 #endif
 134       case EDOM:
 135 #ifdef EEXIST
 136       case EEXIST:
 137 #endif
 138 #ifdef EFAULT
 139       case EFAULT:
 140 #endif
 141 #ifdef EFBIG
 142       case EFBIG:
 143 #endif
 144 #ifdef EHOSTUNREACH
 145       case EHOSTUNREACH:
 146 #endif
 147 #ifdef EIDRM
 148       case EIDRM:
 149 #endif
 150       case EILSEQ:
 151 #ifdef EINPROGRESS
 152       case EINPROGRESS:
 153 #endif
 154 #ifdef EINTR
 155       case EINTR:
 156 #endif
 157 #ifdef EINVAL
 158       case EINVAL:
 159 #endif
 160 #ifdef EIO
 161       case EIO:
 162 #endif
 163 #ifdef EISCONN
 164       case EISCONN:
 165 #endif
 166 #ifdef EISDIR
 167       case EISDIR:
 168 #endif
 169 #ifdef ELOOP
 170       case ELOOP:
 171 #endif
 172 #ifdef EMFILE
 173       case EMFILE:
 174 #endif
 175 #ifdef EMLINK
 176       case EMLINK:
 177 #endif
 178 #ifdef EMSGSIZE
 179       case EMSGSIZE:
 180 #endif
 181 #ifdef ENAMETOOLONG
 182       case ENAMETOOLONG:
 183 #endif
 184 #ifdef ENETDOWN
 185       case ENETDOWN:
 186 #endif
 187 #ifdef ENETRESET
 188       case ENETRESET:
 189 #endif
 190 #ifdef ENETUNREACH
 191       case ENETUNREACH:
 192 #endif
 193 #ifdef ENFILE
 194       case ENFILE:
 195 #endif
 196 #ifdef ENOBUFS
 197       case ENOBUFS:
 198 #endif
 199 #ifdef ENODATA
 200       case ENODATA:
 201 #endif
 202 #ifdef ENODEV
 203       case ENODEV:
 204 #endif
 205 #ifdef ENOENT
 206       case ENOENT:
 207 #endif
 208 #ifdef ENOEXEC
 209       case ENOEXEC:
 210 #endif
 211 #ifdef ENOLCK
 212       case ENOLCK:
 213 #endif
 214 #ifdef ENOLINK
 215       case ENOLINK:
 216 #endif
 217 #ifdef ENOMEM
 218       case ENOMEM:
 219 #endif
 220 #ifdef ENOMSG
 221       case ENOMSG:
 222 #endif
 223 #ifdef ENOPROTOOPT
 224       case ENOPROTOOPT:
 225 #endif
 226 #ifdef ENOSPC
 227       case ENOSPC:
 228 #endif
 229 #ifdef ENOSR
 230       case ENOSR:
 231 #endif
 232 #ifdef ENOSTR
 233       case ENOSTR:
 234 #endif
 235 #ifdef ENOSYS
 236       case ENOSYS:
 237 #endif
 238 #ifdef ENOTCONN
 239       case ENOTCONN:
 240 #endif
 241 #ifdef ENOTDIR
 242       case ENOTDIR:
 243 #endif
 244 #if defined ENOTEMPTY && (!defined EEXIST || ENOTEMPTY != EEXIST)
 245       // AIX sometimes uses the same value for EEXIST and ENOTEMPTY
 246       case ENOTEMPTY:
 247 #endif
 248 #ifdef ENOTRECOVERABLE
 249       case ENOTRECOVERABLE:
 250 #endif
 251 #ifdef ENOTSOCK
 252       case ENOTSOCK:
 253 #endif
 254 #ifdef ENOTSUP
 255       case ENOTSUP:
 256 #endif
 257 #ifdef ENOTTY
 258       case ENOTTY:
 259 #endif
 260 #ifdef ENXIO
 261       case ENXIO:
 262 #endif
 263 #if defined EOPNOTSUPP && (!defined ENOTSUP || EOPNOTSUPP != ENOTSUP)
 264       case EOPNOTSUPP:
 265 #endif
 266 #ifdef EOVERFLOW
 267       case EOVERFLOW:
 268 #endif
 269 #ifdef EOWNERDEAD
 270       case EOWNERDEAD:
 271 #endif
 272 #ifdef EPERM
 273       case EPERM:
 274 #endif
 275 #ifdef EPIPE
 276       case EPIPE:
 277 #endif
 278 #ifdef EPROTO
 279       case EPROTO:
 280 #endif
 281 #ifdef EPROTONOSUPPORT
 282       case EPROTONOSUPPORT:
 283 #endif
 284 #ifdef EPROTOTYPE
 285       case EPROTOTYPE:
 286 #endif
 287       case ERANGE:
 288 #ifdef EROFS
 289       case EROFS:
 290 #endif
 291 #ifdef ESPIPE
 292       case ESPIPE:
 293 #endif
 294 #ifdef ESRCH
 295       case ESRCH:
 296 #endif
 297 #ifdef ETIME
 298       case ETIME:
 299 #endif
 300 #ifdef ETIMEDOUT
 301       case ETIMEDOUT:
 302 #endif
 303 #ifdef ETXTBSY
 304       case ETXTBSY:
 305 #endif
 306 #if defined EWOULDBLOCK && (!defined EAGAIN || EWOULDBLOCK != EAGAIN)
 307       case EWOULDBLOCK:
 308 #endif
 309 #ifdef EXDEV
 310       case EXDEV:
 311 #endif
 312         return std::error_condition(ev, std::generic_category());
 313
 314       /* Additional system-dependent mappings from non-standard error codes
 315        * to one of the POSIX values above would go here, e.g.
 316       case EBLAH:
 317         return std::error_condition(EINVAL, std::generic_category());
 318        */
 319
 320       default:
 321         return std::error_condition(ev, std::system_category());
 322       }
 323     }
 324   };
 325
 326   const generic_error_category generic_category_instance{};
 327   const system_error_category system_category_instance{};
 328 }
 329
 330 namespace std _GLIBCXX_VISIBILITY(default)
 331 {
 332 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 333
 334   void
 335   __throw_system_error(int __i __attribute__((unused)))
 336   {
 337     _GLIBCXX_THROW_OR_ABORT(system_error(error_code(__i, generic_category())));
 338   }
 339
 340   error_category::~error_category() noexcept = default;
 341
 342   const error_category&
 343   _V2::system_category() noexcept { return system_category_instance; }
 344
 345   const error_category&
 346   _V2::generic_category() noexcept { return generic_category_instance; }
 347
 348   system_error::~system_error() noexcept = default;
 349
 350   error_condition
 351   error_category::default_error_condition(int __i) const noexcept
 352   { return error_condition(__i, *this); }
 353
 354   bool
 355   error_category::equivalent(int __i,
 356                              const error_condition& __cond) const noexcept
 357   { return default_error_condition(__i) == __cond; }
 358
 359   bool
 360   error_category::equivalent(const error_code& __code, int __i) const noexcept
 361   { return *this == __code.category() && __code.value() == __i; }
 362
 363   error_condition
 364   error_code::default_error_condition() const noexcept
 365   { return category().default_error_condition(value()); }
 366
 367 #if _GLIBCXX_USE_CXX11_ABI
 368   // Return error_category::message() as a COW string
 369   __cow_string
 370   error_category::_M_message(int i) const
 371   {
 372     string msg = this->message(i);
 373     return {msg.c_str(), msg.length()};
 374   }
 375 #endif
 376
 377 _GLIBCXX_END_NAMESPACE_VERSION
 378 } // namespace