Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 144 insertions, 0 deletions

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+.\" Copyright (C) Andreas Gruenbacher, February 2001
+.\" Copyright (C) Silicon Graphics Inc, September 2001
+.\"
+.\" SPDX-License-Identifier: GPL-2.0-or-later
+.\"
+.TH getxattr 2 2023-03-30 "Linux man-pages 6.04"
+.SH NAME
+getxattr, lgetxattr, fgetxattr \- retrieve an extended attribute value
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <sys/xattr.h>
+.PP
+.BI "ssize_t getxattr(const char *" path ", const char *" name ,
+.BI "                 void " value [. size "], size_t " size );
+.BI "ssize_t lgetxattr(const char *" path ", const char *" name ,
+.BI "                 void " value [. size "], size_t " size );
+.BI "ssize_t fgetxattr(int " fd ", const char *" name ,
+.BI "                 void " value [. size "], size_t " size );
+.fi
+.SH DESCRIPTION
+Extended attributes are
+.IR name :\c
+.I value
+pairs associated with inodes (files, directories, symbolic links, etc.).
+They are extensions to the normal attributes which are associated
+with all inodes in the system (i.e., the
+.BR stat (2)
+data).
+A complete overview of extended attributes concepts can be found in
+.BR xattr (7).
+.PP
+.BR getxattr ()
+retrieves the value of the extended attribute identified by
+.I name
+and associated with the given
+.I path
+in the filesystem.
+The attribute value is placed in the buffer pointed to by
+.IR value ;
+.I size
+specifies the size of that buffer.
+The return value of the call is the number of bytes placed in
+.IR value .
+.PP
+.BR lgetxattr ()
+is identical to
+.BR getxattr (),
+except in the case of a symbolic link, where the link itself is
+interrogated, not the file that it refers to.
+.PP
+.BR fgetxattr ()
+is identical to
+.BR getxattr (),
+only the open file referred to by
+.I fd
+(as returned by
+.BR open (2))
+is interrogated in place of
+.IR path .
+.PP
+An extended attribute
+.I name
+is a null-terminated string.
+The name includes a namespace prefix; there may be several, disjoint
+namespaces associated with an individual inode.
+The value of an extended attribute is a chunk of arbitrary textual or
+binary data that was assigned using
+.BR setxattr (2).
+.PP
+If
+.I size
+is specified as zero, these calls return the current size of the
+named extended attribute (and leave
+.I value
+unchanged).
+This can be used to determine the size of the buffer that
+should be supplied in a subsequent call.
+(But, bear in mind that there is a possibility that the
+attribute value may change between the two calls,
+so that it is still necessary to check the return status
+from the second call.)
+.SH RETURN VALUE
+On success, these calls return a nonnegative value which is
+the size (in bytes) of the extended attribute value.
+On failure, \-1 is returned and
+.I errno
+is set to indicate the error.
+.SH ERRORS
+.TP
+.B E2BIG
+The size of the attribute value is larger than the maximum size allowed; the
+attribute cannot be retrieved.
+This can happen on filesystems that support
+very large attribute values such as NFSv4, for example.
+.TP
+.B ENODATA
+The named attribute does not exist, or the process has no access to
+this attribute.
+.\" .RB ( ENOATTR
+.\" is defined to be a synonym for
+.\" .BR ENODATA
+.\" in
+.\" .IR <attr/attributes.h> .)
+.TP
+.B ENOTSUP
+Extended attributes are not supported by the filesystem, or are disabled.
+.TP
+.B ERANGE
+The
+.I size
+of the
+.I value
+buffer is too small to hold the result.
+.PP
+In addition, the errors documented in
+.BR stat (2)
+can also occur.
+.SH STANDARDS
+Linux.
+.SH HISTORY
+Linux 2.4,
+glibc 2.3.
+.\" .SH AUTHORS
+.\" Andreas Gruenbacher,
+.\" .RI < a.gruenbacher@computer.org >
+.\" and the SGI XFS development team,
+.\" .RI < linux-xfs@oss.sgi.com >.
+.\" Please send any bug reports or comments to these addresses.
+.SH EXAMPLES
+See
+.BR listxattr (2).
+.SH SEE ALSO
+.BR getfattr (1),
+.BR setfattr (1),
+.BR listxattr (2),
+.BR open (2),
+.BR removexattr (2),
+.BR setxattr (2),
+.BR stat (2),
+.BR symlink (7),
+.BR xattr (7)