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author | dchagin <dchagin@FreeBSD.org> | 2017-08-10 05:38:31 +0000 |
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committer | dchagin <dchagin@FreeBSD.org> | 2017-08-10 05:38:31 +0000 |
commit | 7fa36a1ea4124e7ecdcd10155a1df4bac2e0e774 (patch) | |
tree | ffa9487bf8060968f7dc55532290a773da5e2017 /lib/libvgl | |
parent | 58d831d1074873baa2c269c95d3912fd255de1cb (diff) | |
download | FreeBSD-src-7fa36a1ea4124e7ecdcd10155a1df4bac2e0e774.zip FreeBSD-src-7fa36a1ea4124e7ecdcd10155a1df4bac2e0e774.tar.gz |
MFC r321839:
Implement proper Linux /dev/fd and /proc/self/fd behavior by adding
Linux specific things to the native fdescfs file system.
Unlike FreeBSD, the Linux fdescfs is a directory containing a symbolic
links to the actual files, which the process has open.
A readlink(2) call on this file returns a full path in case of regular file
or a string in a special format (type:[inode], anon_inode:<file-type>, etc..).
As well as in a FreeBSD, opening the file in the Linux fdescfs directory is
equivalent to duplicating the corresponding file descriptor.
Here we have mutually exclusive requirements:
- in case of readlink(2) call fdescfs lookup() method should return VLNK
vnode otherwise our kern_readlink() fail with EINVAL error;
- in the other calls fdescfs lookup() method should return non VLNK vnode.
For what new vnode v_flag VV_READLINK was added, which is set if fdescfs has beed
mounted with linrdlnk option an modified kern_readlinkat() to properly handle it.
For now For Linux ABI compatibility mount fdescfs volume with linrdlnk option:
mount -t fdescfs -o linrdlnk null /compat/linux/dev/fd
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D11452
Diffstat (limited to 'lib/libvgl')
0 files changed, 0 insertions, 0 deletions