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Date: Thu, 03 May 2012 13:57:21 +0530 From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> To: "Ted Ts'o" <tytso@....edu> Cc: "Michael Kerrisk \(man-pages\)" <mtk.manpages@...il.com>, Mike Frysinger <vapier@...too.org>, linux-man@...r.kernel.org, viro@...iv.linux.org.uk, Richard Weinberger <richard@....at>, lkml <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] open(2): document O_PATH Ted Ts'o <tytso@....edu> writes: > It might also be a good idea to document explicitly whether or not > things like fstat() and the syscalls to manipulate extended attributes > are expected to work. > fstat won't work, but fstatat with an empty path name would work. O_PATH descriptors are suppose to be used as "location only descriptors". We then extended the *at syscalls to work with EMPTY pathnames so that O_PATH descriptors can be used with readlink, fchownat and fstatat(). This was done to enable us to do these operation on symlinks. (65cfc6722361570bfe255698d9cd4dccaf47570d) Examples for O_PATH and handle syscall can be found in qemu and handle-test repo http://git.qemu.org/?p=qemu.git;a=blob;f=hw/9pfs/virtio-9p-handle.c;h=f96d17a9749a6f672741ff4dcb98da81d1dcc3ce;hb=HEAD https://github.com/kvaneesh/handle-test/blob/master/handle.h -aneesh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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