getxattr man page on Kali

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GETXATTR(2)			 System calls			   GETXATTR(2)

NAME
       getxattr, lgetxattr, fgetxattr - retrieve an extended attribute value

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

       ssize_t getxattr (const char *path, const char *name,
			    void *value, size_t size);
       ssize_t lgetxattr (const char *path, const char *name,
			    void *value, size_t size);
       ssize_t fgetxattr (int filedes, const char *name,
			    void *value, size_t size);

DESCRIPTION
       Extended attributes are name:value pairs associated with inodes (files,
       directories,  symlinks,	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).

       getxattr	 retrieves  the	 value of the extended attribute identified by
       name and associated with the given path in the filesystem.  The	length
       of the attribute value is returned.

       lgetxattr  is  identical	 to getxattr, except in the case of a symbolic
       link, where the link itself is  interrogated,  not  the	file  that  it
       refers to.

       fgetxattr  is  identical	 to getxattr, only the open file pointed to by
       filedes (as returned by open(2)) is interrogated in place of path.

       An 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.   The	 value	of  an
       extended	 attribute  is	a chunk of arbitrary textual or binary data of
       specified length.

       An empty buffer of size zero can be passed into these calls  to	return
       the  current size of the named extended attribute, which can be used to
       estimate the size of a buffer which is sufficiently large to  hold  the
       value associated with the extended attribute.

       The  interface  is  designed to allow guessing of initial buffer sizes,
       and to enlarge buffers when the return value indicates that the	buffer
       provided was too small.

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

       If  the named attribute does not exist, or the process has no access to
       this attribute, errno is set to ENOATTR.

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

       If extended attributes are not supported by the filesystem, or are dis‐
       abled, errno is set to ENOTSUP.

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

AUTHORS
       Andreas Gruenbacher, <a.gruenbacher@bestbits.at> and the SGI XFS devel‐
       opment team, <linux-xfs@oss.sgi.com>.  Please send any bug  reports  or
       comments to these addresses.

SEE ALSO
       getfattr(1),  setfattr(1), open(2), stat(2), setxattr(2), listxattr(2),
       removexattr(2), and attr(5).

Dec 2001		      Extended Attributes		   GETXATTR(2)
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