xapian-core/common/safefcntl.h

   1 /** @file safefcntl.h
   2  * @brief #include <fcntl.h>, but working around broken platforms.
   3  */
   4 /* Copyright (C) 2006,2007,2012 Olly Betts
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program 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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
  19  * USA
  20  */
  21
  22 #ifndef XAPIAN_INCLUDED_SAFEFCNTL_H
  23 #define XAPIAN_INCLUDED_SAFEFCNTL_H
  24
  25 #include <fcntl.h>
  26
  27 #if defined __cplusplus && defined open
  28
  29 // On some versions of Solaris, fcntl.h pollutes the namespace by #define-ing
  30 // "open" to "open64" when largefile support is enabled.  This causes problems
  31 // if you have a method called "open" (other symbols are also #define-d
  32 // e.g. "creat" to "creat64", but only "open" is a problem for Xapian so
  33 // that's the only one we currently fix).
  34
  35 #ifdef _MSC_VER
  36 // MSVC #define-s open but also defines a function called open, so just undef
  37 // the macro.
  38 # undef open
  39 #else
  40
  41 inline int fcntl_open_(const char *filename, int flags, mode_t mode) {
  42     return open(filename, flags, mode);
  43 }
  44
  45 inline int fcntl_open_(const char *filename, int flags) {
  46     return open(filename, flags);
  47 }
  48
  49 #undef open
  50
  51 inline int open(const char *filename, int flags, mode_t mode) {
  52     return fcntl_open_(filename, flags, mode);
  53 }
  54
  55 inline int open(const char *filename, int flags) {
  56     return fcntl_open_(filename, flags);
  57 }
  58
  59 #endif
  60
  61 #endif
  62
  63 // O_BINARY is only useful for platforms like Windows which distinguish between
  64 // text and binary files, but it's cleaner to define it to 0 here for other
  65 // platforms so we can avoid #ifdef where we need to use it in the code.
  66 #ifndef __WIN32__
  67 # ifndef O_BINARY
  68 #  define O_BINARY 0
  69 # endif
  70 #endif
  71
  72 // If O_CLOEXEC isn't supported, we probably can't mark fds as close-on-exec.
  73 #ifndef O_CLOEXEC
  74 # define O_CLOEXEC 0
  75 #endif
  76
  77 #endif /* XAPIAN_INCLUDED_SAFEFCNTL_H */