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12856373f8
* modules/nonblocking (Depends-on): Remove 'open'. * m4/nonblocking.m4 (gl_NONBLOCKING_IO_BODY): Set gl_cv_have_open_O_NONBLOCK. * m4/open.m4 (gl_FUNC_OPEN): Replace open() also when required for O_NONBLOCK support. * doc/posix-functions/open.texi: Document support for O_NONBLOCK.
43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
Plaintext
@node open
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@section @code{open}
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@findex open
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/open.html}
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Gnulib module: open, fchdir
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Portability problems fixed by the Gnulib module open:
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@itemize
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@item
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This function does not fail when the file name argument ends in a slash
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and (without the slash) names a nonexistent file or a file that is not a
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directory, on some platforms:
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FreeBSD 7.2, AIX 7.1, HP-UX 11.00, Solaris 9, Irix 5.3.
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@item
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This function does not support the @code{O_NONBLOCK} flag when it is defined
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by the gnulib module @code{nonblock} on some platforms:
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mingw.
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@item
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On Windows platforms (excluding Cygwin), this function does usually not
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recognize the @file{/dev/null} filename.
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@end itemize
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Portability problems fixed by the Gnulib module fchdir:
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@itemize
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@item
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On Windows platforms (excluding Cygwin), this function fails to open a
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read-only descriptor for directories.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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On Windows, this function returns a file handle in @code{O_TEXT} mode by
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default; this means that it translates '\n' to CR/LF by default. Use the
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@code{O_BINARY} flag if you need reliable binary I/O.
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@item
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On platforms where @code{off_t} is a 32-bit type, @code{open} may not work
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correctly with files larger than 2 GB. The fix is to use the
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@code{AC_SYS_LARGEFILE} macro.
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@end itemize
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