kc3-lang/gnulib/doc/posix-functions/open.texi

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• Hash : da131735
  Author :
  Date : 2024-11-19T18:29:57
  

  savewd: remove O_SEARCH optimization
  
  * lib/savewd.c (savewd_save): Remove recently-added optimization
  for platforms with O_SEARCH, as it does not work on macOS 12.6
  due to what seems to be a bug there.
  

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• doc/posix-functions/open.texi

• @node open
  @subsection @code{open}
  @findex open
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/open.html}
  
  Gnulib module: open, fchdir
  @mindex open
  @mindex fchdir
  
  Portability problems fixed by the Gnulib module @code{open}:
  @itemize
  @item
  Some platforms do not support @code{O_CLOEXEC}:
  @c See posix-headers/fcntl.texi for the list.
  Mac OS X 10.6, FreeBSD 8.4, NetBSD 5.1, OpenBSD 4.9, Minix 3.1.8, AIX 7.1, HP-UX 11, Solaris 10, Cygwin 1.7.x, mingw, MSVC 14.
  @item
  On platforms where @code{off_t} is a 32-bit type, @code{open} may not work
  correctly with files 2 GiB and larger.  @xref{Large File Support}.
  @item
  This function does not fail when the file name argument ends in a slash
  and (without the slash) names a nonexistent file or a file that is not a
  directory, on some platforms:
  macOS 14, FreeBSD 7.2, AIX 7.1, HP-UX 11.00, Solaris 9.
  @item
  @mindex nonblocking
  This function does not support the @code{O_NONBLOCK} flag when it is defined
  by the gnulib module @code{nonblocking} on some platforms:
  mingw, MSVC 14.
  @item
  On Windows platforms (excluding Cygwin), this function does usually not
  recognize the @file{/dev/null} filename.
  @end itemize
  
  Portability problems fixed by the Gnulib module @code{fchdir}:
  @itemize
  @item
  On Windows platforms (excluding Cygwin), this function fails to open a
  read-only descriptor for directories.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  The Gnulib replacement for @code{O_CLOEXEC} is not atomic, and so is
  not safe in the presence of multiple threads or signal handlers.
  @item
  The Gnulib replacement for @code{O_SEARCH} may require read access
  instead of search/execute access.
  @item
  On some platforms, @code{O_SEARCH} may reject directories
  where you have search access even though @code{O_SEARCH} is not replaced:
  macOS 12.6.
  @item
  @code{open ("symlink", O_CREAT ...)} fails when the argument points to a
  nonexistent file in an existing directory on some platforms:
  @c https://dev.haiku-os.org/ticket/18355
  Haiku.
  @item
  @code{open ("symlink", O_NOFOLLOW ...)} fails with @code{errno} set to
  @code{EMLINK} instead of the POSIX-required @code{ELOOP} on some
  platforms:
  FreeBSD 10.1.
  @item
  @code{open ("symlink", O_NOFOLLOW ...)} fails with @code{errno} set to
  @code{EFTYPE} instead of the POSIX-required @code{ELOOP} on some
  platforms:
  NetBSD 6.1.
  @item
  On Windows, this function returns a file handle in @code{O_TEXT} mode by
  default; this means that it translates @code{'\n'} to CR/LF by default.  Use the
  @code{O_BINARY} flag if you need reliable binary I/O.
  @end itemize
  

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