lib/fcntl.in.h

   1 /* Like <fcntl.h>, but with non-working flags defined to 0.
   2
   3    Copyright (C) 2006-2016 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* written by Paul Eggert */
  19
  20 #if __GNUC__ >= 3
  21 @PRAGMA_SYSTEM_HEADER@
  22 #endif
  23 @PRAGMA_COLUMNS@
  24
  25 #if defined __need_system_fcntl_h
  26 /* Special invocation convention.  */
  27
  28 /* Needed before <sys/stat.h>.
  29    May also define off_t to a 64-bit type on native Windows.  */
  30 #include <sys/types.h>
  31 /* On some systems other than glibc, <sys/stat.h> is a prerequisite of
  32    <fcntl.h>.  On glibc systems, we would like to avoid namespace pollution.
  33    But on glibc systems, <fcntl.h> includes <sys/stat.h> inside an
  34    extern "C" { ... } block, which leads to errors in C++ mode with the
  35    overridden <sys/stat.h> from gnulib.  These errors are known to be gone
  36    with g++ version >= 4.3.  */
  37 #if !(defined __GLIBC__ || defined __UCLIBC__) || (defined __cplusplus && defined GNULIB_NAMESPACE && (defined __ICC || !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))))
  38 # include <sys/stat.h>
  39 #endif
  40 #@INCLUDE_NEXT@ @NEXT_FCNTL_H@
  41
  42 #else
  43 /* Normal invocation convention.  */
  44
  45 #ifndef _@GUARD_PREFIX@_FCNTL_H
  46
  47 /* Needed before <sys/stat.h>.
  48    May also define off_t to a 64-bit type on native Windows.  */
  49 #include <sys/types.h>
  50 /* On some systems other than glibc, <sys/stat.h> is a prerequisite of
  51    <fcntl.h>.  On glibc systems, we would like to avoid namespace pollution.
  52    But on glibc systems, <fcntl.h> includes <sys/stat.h> inside an
  53    extern "C" { ... } block, which leads to errors in C++ mode with the
  54    overridden <sys/stat.h> from gnulib.  These errors are known to be gone
  55    with g++ version >= 4.3.  */
  56 #if !(defined __GLIBC__ || defined __UCLIBC__) || (defined __cplusplus && defined GNULIB_NAMESPACE && (defined __ICC || !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))))
  57 # include <sys/stat.h>
  58 #endif
  59 /* The include_next requires a split double-inclusion guard.  */
  60 #@INCLUDE_NEXT@ @NEXT_FCNTL_H@
  61
  62 #ifndef _@GUARD_PREFIX@_FCNTL_H
  63 #define _@GUARD_PREFIX@_FCNTL_H
  64
  65 #ifndef __GLIBC__ /* Avoid namespace pollution on glibc systems.  */
  66 # include <unistd.h>
  67 #endif
  68
  69 /* Native Windows platforms declare open(), creat() in <io.h>.  */
  70 #if (@GNULIB_OPEN@ || defined GNULIB_POSIXCHECK) \
  71     && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)
  72 # include <io.h>
  73 #endif
  74
  75
  76 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
  77
  78 /* The definition of _GL_ARG_NONNULL is copied here.  */
  79
  80 /* The definition of _GL_WARN_ON_USE is copied here.  */
  81
  82
  83 /* Declare overridden functions.  */
  84
  85 #if @GNULIB_FCNTL@
  86 # if @REPLACE_FCNTL@
  87 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
  88 #   undef fcntl
  89 #   define fcntl rpl_fcntl
  90 #  endif
  91 _GL_FUNCDECL_RPL (fcntl, int, (int fd, int action, ...));
  92 _GL_CXXALIAS_RPL (fcntl, int, (int fd, int action, ...));
  93 # else
  94 #  if !@HAVE_FCNTL@
  95 _GL_FUNCDECL_SYS (fcntl, int, (int fd, int action, ...));
  96 #  endif
  97 _GL_CXXALIAS_SYS (fcntl, int, (int fd, int action, ...));
  98 # endif
  99 _GL_CXXALIASWARN (fcntl);
 100 #elif defined GNULIB_POSIXCHECK
 101 # undef fcntl
 102 # if HAVE_RAW_DECL_FCNTL
 103 _GL_WARN_ON_USE (fcntl, "fcntl is not always POSIX compliant - "
 104                  "use gnulib module fcntl for portability");
 105 # endif
 106 #endif
 107
 108 #if @GNULIB_OPEN@
 109 # if @REPLACE_OPEN@
 110 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 111 #   undef open
 112 #   define open rpl_open
 113 #  endif
 114 _GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...)
 115                              _GL_ARG_NONNULL ((1)));
 116 _GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...));
 117 # else
 118 _GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...));
 119 # endif
 120 /* On HP-UX 11, in C++ mode, open() is defined as an inline function with a
 121    default argument.  _GL_CXXALIASWARN does not work in this case.  */
 122 # if !defined __hpux
 123 _GL_CXXALIASWARN (open);
 124 # endif
 125 #elif defined GNULIB_POSIXCHECK
 126 # undef open
 127 /* Assume open is always declared.  */
 128 _GL_WARN_ON_USE (open, "open is not always POSIX compliant - "
 129                  "use gnulib module open for portability");
 130 #endif
 131
 132 #if @GNULIB_OPENAT@
 133 # if @REPLACE_OPENAT@
 134 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 135 #   undef openat
 136 #   define openat rpl_openat
 137 #  endif
 138 _GL_FUNCDECL_RPL (openat, int,
 139                   (int fd, char const *file, int flags, /* mode_t mode */ ...)
 140                   _GL_ARG_NONNULL ((2)));
 141 _GL_CXXALIAS_RPL (openat, int,
 142                   (int fd, char const *file, int flags, /* mode_t mode */ ...));
 143 # else
 144 #  if !@HAVE_OPENAT@
 145 _GL_FUNCDECL_SYS (openat, int,
 146                   (int fd, char const *file, int flags, /* mode_t mode */ ...)
 147                   _GL_ARG_NONNULL ((2)));
 148 #  endif
 149 _GL_CXXALIAS_SYS (openat, int,
 150                   (int fd, char const *file, int flags, /* mode_t mode */ ...));
 151 # endif
 152 _GL_CXXALIASWARN (openat);
 153 #elif defined GNULIB_POSIXCHECK
 154 # undef openat
 155 # if HAVE_RAW_DECL_OPENAT
 156 _GL_WARN_ON_USE (openat, "openat is not portable - "
 157                  "use gnulib module openat for portability");
 158 # endif
 159 #endif
 160
 161
 162 /* Fix up the FD_* macros, only known to be missing on mingw.  */
 163
 164 #ifndef FD_CLOEXEC
 165 # define FD_CLOEXEC 1
 166 #endif
 167
 168 /* Fix up the supported F_* macros.  Intentionally leave other F_*
 169    macros undefined.  Only known to be missing on mingw.  */
 170
 171 #ifndef F_DUPFD_CLOEXEC
 172 # define F_DUPFD_CLOEXEC 0x40000000
 173 /* Witness variable: 1 if gnulib defined F_DUPFD_CLOEXEC, 0 otherwise.  */
 174 # define GNULIB_defined_F_DUPFD_CLOEXEC 1
 175 #else
 176 # define GNULIB_defined_F_DUPFD_CLOEXEC 0
 177 #endif
 178
 179 #ifndef F_DUPFD
 180 # define F_DUPFD 1
 181 #endif
 182
 183 #ifndef F_GETFD
 184 # define F_GETFD 2
 185 #endif
 186
 187 /* Fix up the O_* macros.  */
 188
 189 /* AIX 7.1 with XL C 12.1 defines O_CLOEXEC, O_NOFOLLOW, and O_TTY_INIT
 190    to values outside 'int' range, so omit these misdefinitions.
 191    But avoid namespace pollution on non-AIX systems.  */
 192 #ifdef _AIX
 193 # include <limits.h>
 194 # if defined O_CLOEXEC && ! (INT_MIN <= O_CLOEXEC && O_CLOEXEC <= INT_MAX)
 195 #  undef O_CLOEXEC
 196 # endif
 197 # if defined O_NOFOLLOW && ! (INT_MIN <= O_NOFOLLOW && O_NOFOLLOW <= INT_MAX)
 198 #  undef O_NOFOLLOW
 199 # endif
 200 # if defined O_TTY_INIT && ! (INT_MIN <= O_TTY_INIT && O_TTY_INIT <= INT_MAX)
 201 #  undef O_TTY_INIT
 202 # endif
 203 #endif
 204
 205 #if !defined O_DIRECT && defined O_DIRECTIO
 206 /* Tru64 spells it 'O_DIRECTIO'.  */
 207 # define O_DIRECT O_DIRECTIO
 208 #endif
 209
 210 #if !defined O_CLOEXEC && defined O_NOINHERIT
 211 /* Mingw spells it 'O_NOINHERIT'.  */
 212 # define O_CLOEXEC O_NOINHERIT
 213 #endif
 214
 215 #ifndef O_CLOEXEC
 216 # define O_CLOEXEC 0
 217 #endif
 218
 219 #ifndef O_DIRECT
 220 # define O_DIRECT 0
 221 #endif
 222
 223 #ifndef O_DIRECTORY
 224 # define O_DIRECTORY 0
 225 #endif
 226
 227 #ifndef O_DSYNC
 228 # define O_DSYNC 0
 229 #endif
 230
 231 #ifndef O_EXEC
 232 # define O_EXEC O_RDONLY /* This is often close enough in older systems.  */
 233 #endif
 234
 235 #ifndef O_IGNORE_CTTY
 236 # define O_IGNORE_CTTY 0
 237 #endif
 238
 239 #ifndef O_NDELAY
 240 # define O_NDELAY 0
 241 #endif
 242
 243 #ifndef O_NOATIME
 244 # define O_NOATIME 0
 245 #endif
 246
 247 #ifndef O_NONBLOCK
 248 # define O_NONBLOCK O_NDELAY
 249 #endif
 250
 251 /* If the gnulib module 'nonblocking' is in use, guarantee a working non-zero
 252    value of O_NONBLOCK.  Otherwise, O_NONBLOCK is defined (above) to O_NDELAY
 253    or to 0 as fallback.  */
 254 #if @GNULIB_NONBLOCKING@
 255 # if O_NONBLOCK
 256 #  define GNULIB_defined_O_NONBLOCK 0
 257 # else
 258 #  define GNULIB_defined_O_NONBLOCK 1
 259 #  undef O_NONBLOCK
 260 #  define O_NONBLOCK 0x40000000
 261 # endif
 262 #endif
 263
 264 #ifndef O_NOCTTY
 265 # define O_NOCTTY 0
 266 #endif
 267
 268 #ifndef O_NOFOLLOW
 269 # define O_NOFOLLOW 0
 270 #endif
 271
 272 #ifndef O_NOLINK
 273 # define O_NOLINK 0
 274 #endif
 275
 276 #ifndef O_NOLINKS
 277 # define O_NOLINKS 0
 278 #endif
 279
 280 #ifndef O_NOTRANS
 281 # define O_NOTRANS 0
 282 #endif
 283
 284 #ifndef O_RSYNC
 285 # define O_RSYNC 0
 286 #endif
 287
 288 #ifndef O_SEARCH
 289 # define O_SEARCH O_RDONLY /* This is often close enough in older systems.  */
 290 #endif
 291
 292 #ifndef O_SYNC
 293 # define O_SYNC 0
 294 #endif
 295
 296 #ifndef O_TTY_INIT
 297 # define O_TTY_INIT 0
 298 #endif
 299
 300 #if ~O_ACCMODE & (O_RDONLY | O_WRONLY | O_RDWR | O_EXEC | O_SEARCH)
 301 # undef O_ACCMODE
 302 # define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR | O_EXEC | O_SEARCH)
 303 #endif
 304
 305 /* For systems that distinguish between text and binary I/O.
 306    O_BINARY is usually declared in fcntl.h  */
 307 #if !defined O_BINARY && defined _O_BINARY
 308   /* For MSC-compatible compilers.  */
 309 # define O_BINARY _O_BINARY
 310 # define O_TEXT _O_TEXT
 311 #endif
 312
 313 #if defined __BEOS__ || defined __HAIKU__
 314   /* BeOS 5 and Haiku have O_BINARY and O_TEXT, but they have no effect.  */
 315 # undef O_BINARY
 316 # undef O_TEXT
 317 #endif
 318
 319 #ifndef O_BINARY
 320 # define O_BINARY 0
 321 # define O_TEXT 0
 322 #endif
 323
 324 /* Fix up the AT_* macros.  */
 325
 326 /* Work around a bug in Solaris 9 and 10: AT_FDCWD is positive.  Its
 327    value exceeds INT_MAX, so its use as an int doesn't conform to the
 328    C standard, and GCC and Sun C complain in some cases.  If the bug
 329    is present, undef AT_FDCWD here, so it can be redefined below.  */
 330 #if 0 < AT_FDCWD && AT_FDCWD == 0xffd19553
 331 # undef AT_FDCWD
 332 #endif
 333
 334 /* Use the same bit pattern as Solaris 9, but with the proper
 335    signedness.  The bit pattern is important, in case this actually is
 336    Solaris with the above workaround.  */
 337 #ifndef AT_FDCWD
 338 # define AT_FDCWD (-3041965)
 339 #endif
 340
 341 /* Use the same values as Solaris 9.  This shouldn't matter, but
 342    there's no real reason to differ.  */
 343 #ifndef AT_SYMLINK_NOFOLLOW
 344 # define AT_SYMLINK_NOFOLLOW 4096
 345 #endif
 346
 347 #ifndef AT_REMOVEDIR
 348 # define AT_REMOVEDIR 1
 349 #endif
 350
 351 /* Solaris 9 lacks these two, so just pick unique values.  */
 352 #ifndef AT_SYMLINK_FOLLOW
 353 # define AT_SYMLINK_FOLLOW 2
 354 #endif
 355
 356 #ifndef AT_EACCESS
 357 # define AT_EACCESS 4
 358 #endif
 359
 360
 361 #endif /* _@GUARD_PREFIX@_FCNTL_H */
 362 #endif /* _@GUARD_PREFIX@_FCNTL_H */
 363 #endif