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

       getxattr, lgetxattr, fgetxattr - retrieve an extended attribute value

       #include <sys/types.h>
       #include <sys/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 fd, const char *name,
			void *value, 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).

       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 sym‐
       bolic link, where the link itself is interrogated, not the file that it
       refers to.

       fgetxattr()  is identical to getxattr(), only the open file referred to
       by fd (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 names‐
       paces associated with an individual inode.  The value  of  an  extended
       attribute  is  a chunk of arbitrary textual or binary data of specified

       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.

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

	      The named attribute does not exist, or the process has no access
	      to this attribute.  (ENOATTR is defined to be a synonym for ENO‐
	      DATA in <attr/xattr.h>.)

	      Extended	attributes are not supported by the filesystem, or are

       ERANGE The size of the value buffer is too small to hold the result.

       In addition, the errors documented in stat(2) 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.

       getfattr(1),  setfattr(1), listxattr(2), open(2), removexattr(2), setx‐
       attr(2), stat(2), attr(5), symlink(7)

       This page is part of release 3.65 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				  2014-04-06			   GETXATTR(2)

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