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LISTXATTR(2)               Linux Programmer's Manual              LISTXATTR(2)

       listxattr, llistxattr, flistxattr - list extended attribute names

       #include <sys/types.h>
       #include <attr/xattr.h>

       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 stat(2) data).  A complete overview of extended attributes concepts
       can be found in attr(5).

       listxattr()  retrieves  the list of extended attribute names associated
       with the given path in the file system.  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 list is returned.

       llistxattr()  is identical to listxattr(), except in the case of a sym-
       bolic link, where the list of names of extended  attributes  associated
       with the link itself is retrieved, not the file that it refers to.

       flistxattr()  is  identical to listxattr(), only the open file referred
       to by fd (as returned by open(2)) is interrogated in place of path.

       A single extended attribute name 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 size 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.

       The  list 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 list like this:


       On success, a positive number is returned indicating the  size  of  the
       extended  attribute name list.  On failure, -1 is returned and errno is
       set appropriately.

       If the size of the list buffer is too small to hold the  result,  errno
       is set to ERANGE.

       If  extended  attributes  are  not supported by the file system, or are
       disabled, errno is set to ENOTSUP.

       The errors documented for the stat(2) system call are  also  applicable

       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.

       getfattr(1), setfattr(1), getxattr(2), open(2),  removexattr(2),  setx-
       attr(2), stat(2), attr(5), symlink(7)

       This  page  is  part of release 3.25 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux                             2001-12-01                      LISTXATTR(2)

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