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Linux Programmer's Manual (2)
listxattr, llistxattr, flistxattr - list extended attribute names
ssize_t listxattr(const char *path, char *list, size_t size);
ssize_t llistxattr(const char *path, char *list, size_t size);
ssize_t flistxattr(int fd, char *list, size_t size);
Extended attributes are name: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
A complete overview of extended attributes concepts can be found in
retrieves the list
of extended attribute names associated with the given
in the filesystem.
The retrieved list is placed in
a caller-allocated buffer whose size (in bytes) is specified in the argument
The list is the set of (null-terminated) names, one after the other.
Names of extended attributes to which the calling process does not
have access may be omitted from the list.
The length of the attribute name
is identical to
except in the case of a symbolic link, where the list of names of
extended attributes associated with the link itself is retrieved,
not the file that it refers to.
is identical to
only the open file referred to by
(as returned by
is interrogated in place of
A single extended attribute
is a simple null-terminated string.
The name includes a namespace prefix; there may be several, disjoint
namespaces associated with an individual inode.
An empty buffer of
zero can be passed into these calls to return the current size of the
list of extended attribute names, which can be used to estimate the
size of a buffer which is sufficiently large to hold the list of names.
of names is returned as an unordered array of null-terminated character
strings (attribute names are separated by null bytes ('\0')), like this:
Filesystems like ext2, ext3 and XFS which implement POSIX ACLs using
extended attributes, might return a
On success, a nonnegative number is returned indicating the size of the
extended attribute name list.
On failure, -1 is returned and
is set appropriately.
Extended attributes are not supported by the filesystem, or are disabled.
buffer is too small to hold the result.
In addition, the errors documented in
can also occur.
These system calls have been available on Linux since kernel 2.4;
glibc support is provided since version 2.3.
These system calls are Linux-specific.
This page is part of release 3.66 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
- RETURN VALUE
- CONFORMING TO
- SEE ALSO
This document was created by
using the manual pages.
Time: 21:42:57 GMT, July 12, 2014