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8c9cfa07e6
* doc/posix-functions/readlink.texi: Mention that OS X 10.10 has this bug. * doc/posix-functions/readlinkat.texi: Likewise. Also mention that OS X 10.10 has this function. * lib/readlinkat.c (rpl_readlinkat): Handle the trailing slash bug, as done for readlink(). * m4/readlinkat.m4 (gl_FUNC_READLINKAT): Check for the readlink() trailing slash bug, and assume readlinkat() has the same issue. Also fix a typo where $gl_cv_decl_readlink_works was tested, rather than the correct $gl_cv_decl_readlinkat_works.
49 lines
1.8 KiB
Plaintext
49 lines
1.8 KiB
Plaintext
@node readlinkat
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@section @code{readlinkat}
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@findex readlinkat
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html}
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Gnulib module: readlinkat
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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glibc 2.3.6, Mac OS X < 10.10, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8,
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AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS.
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But the replacement function is not safe to be used in libraries and is not multithread-safe.
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@item
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Some platforms mistakenly succeed on @code{readlink("link/",buf,len)}:
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Mac OS X 10.10.
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@item
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On some platforms, @code{readlinkat} returns @code{int} instead of
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@code{ssize_t}:
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AIX 7.1.
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@item
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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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This function always fails on platforms that don't support symlinks:
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mingw, MSVC 9.
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@item
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When @code{readlink} is called on a directory: In the case of NFS mounted
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directories, Cygwin sets @code{errno} to @code{ENOENT} or @code{EIO} instead of
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@code{EINVAL}. To avoid this problem, check for a directory before calling
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@code{readlink}.
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@item
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When @code{readlink} is called on a file that is not a symbolic link:
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Irix may set @code{errno} to @code{ENXIO} instead of @code{EINVAL}. Cygwin
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may set errno to @code{EACCES} instead of @code{EINVAL}.
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@item
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Symlink contents do not always have a trailing null byte, and there is
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no indication if symlink contents were truncated if the return value
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matches the length. Furthermore, AIX 5.1 and HP-UX 11 set
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@code{errno} to @code{ERANGE} rather than returning truncated
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contents, and Linux sets @code{errno} to @code{EINVAL} if the
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requested length is zero. Use the gnulib module areadlink for
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improved ability to read symlink contents.
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@end itemize
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