@section @code{open}
@findex open
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/open.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/open.html}
-Gnulib module: open
+Gnulib module: open, fchdir
-Portability problems fixed by Gnulib:
+Portability problems fixed by the Gnulib module open:
@itemize
@item
+On platforms where @code{off_t} is a 32-bit type, @code{open} may not work
+correctly with files larger than 2 GB. (Cf. @code{AC_SYS_LARGEFILE}.)
+@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:
-HP-UX 11.00, Solaris 9.
+FreeBSD 7.2, AIX 7.1, HP-UX 11.00, Solaris 9, Irix 5.3.
+@item
+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 9.
@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 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
On Windows, this function returns a file handle in @code{O_TEXT} mode by
-default; this means that it translates '\n' to CR/LF by default. Use the
+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.
-@item
-On platforms where @code{off_t} is a 32-bit type, @code{open} may not work
-correctly with files larger than 2 GB. The fix is to use the
-@code{AC_SYS_LARGEFILE} macro.
@end itemize