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08a713e078
* doc/posix-functions/open.texi (open): * doc/posix-functions/openat.texi (openat): Document that these functions do not set errno to ELOOP when a symlink is opened with O_NOFOLLOW.
52 lines
1.7 KiB
Plaintext
52 lines
1.7 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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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. (Cf. @code{AC_SYS_LARGEFILE}.)
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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{nonblocking} on some platforms:
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mingw, MSVC 9.
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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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@code{open ("symlink", O_NOFOLLOW ...)} fails with @code{errno} set to
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@code{EMLINK} instead of the POSIX-required @code{ELOOP} on some
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platforms:
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FreeBSD 10.1.
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@item
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@code{open ("symlink", O_NOFOLLOW ...)} fails with @code{errno} set to
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@code{EFTYPE} instead of the POSIX-required @code{ELOOP} on some
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platforms:
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NetBSD 6.1.
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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 @code{'\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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@end itemize
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