74 lines
2.5 KiB
Plaintext
74 lines
2.5 KiB
Plaintext
@node open
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@subsection @code{open}
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@findex open
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/open.html}
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Gnulib module: open, fchdir
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@mindex open
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@mindex fchdir
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Portability problems fixed by the Gnulib module @code{open}:
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@itemize
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@item
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Some platforms do not support @code{O_CLOEXEC}:
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@c See posix-headers/fcntl.texi for the list.
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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.
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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 2 GiB and larger. @xref{Large File Support}.
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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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macOS 14, FreeBSD 7.2, AIX 7.1, HP-UX 11.00, Solaris 9.
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@item
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@mindex nonblocking
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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 14.
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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 @code{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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The Gnulib replacement for @code{O_CLOEXEC} is not atomic, and so is
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not safe in the presence of multiple threads or signal handlers.
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@item
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The Gnulib replacement for @code{O_SEARCH} may require read access
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instead of search/execute access.
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@item
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On some platforms, @code{O_SEARCH} may reject directories
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where you have search access even though @code{O_SEARCH} is not replaced:
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macOS 12.6.
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@item
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@code{open ("symlink", O_CREAT ...)} fails when the argument points to a
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nonexistent file in an existing directory on some platforms:
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@c https://dev.haiku-os.org/ticket/18355
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Haiku.
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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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