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 disabled, 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 development 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).
More Linux Commands
manpages/pcre16_config.3.html
pcre16_config(3) Perl-compatible regular expressions........
This function makes it possible for a client program to find out which optional features are available in the version of the PCRE library it is using. The argum
manpages/postalias.1.html
postalias(1) - Postfix alias database maintenance (ManPage)
The postalias(1) command creates or queries one or more Postfix alias databases, or updates an existing one. The input and output file formats are expected to b
manpages/binary.n.html
binary(n) - Insert and extract fields from binary strings...
This command provides facilities for manipulating binary data. The subcommand binary format creates a binary string from normal Tcl values. For example, given t
manpages/xdr_getpos.3.html
xdr_getpos(3) - library routines for external data represent
These routines allow C programmers to describe arbitrary data structures in a machine-independent fashion. Data for remote procedure calls are transmitted using
manpages/Tcl_DumpActiveMemory.3.html
Tcl_DumpActiveMemory(3) - Validated memory allocation interf
These functions provide access to Tcl memory debugging information. They are only functional when Tcl has been compiled with TCL_MEM_DEBUG defined at compile-ti
manpages/nm.1.html
nm(1) - list symbols from object files - Linux manual page
GNU nm lists the symbols from object files objfile.... If no object files are listed as arguments, nm assumes the file a.out. For each symbol, nm shows: * The s
manpages/pselect.2.html
pselect(2) - synchronous I/O multiplexing - Linux man page
select() and pselect() allow a program to monitor multiple file descriptors, waiting until one or more of the file descriptors become ready for some class of I/
manpages/XcmsSetWhitePoint.3.html
XcmsSetWhitePoint(3) - modifying CCC attributes (Man Page)
The XcmsSetWhitePoint function changes the Client White Point in the specified CCC. Note that the pixel member is ignored and that the color specification is le
manpages/DisplayHeightMM.3.html
DisplayHeightMM(3) - image format functions and macros......
The XListPixmapFormats function returns an array of XPixmapFormatValues structures that describe the types of Z format images supported by the specified display
manpages/systemd-update-utmp-runlevel.service.8.html
systemd-update-utmp-runlevel.service(8) Write audit and utmp
systemd-update-utmp-runlevel.service is a service that writes SysV runlevel changes to utmp and wtmp, as well as the audit logs, as they occur. systemd-update-u
manpages/Tcl_GetChannelType.3.html
Tcl_GetChannelType(3) - procedures for creating and manipula
Tcl uses a two-layered channel architecture. It provides a generic upper layer to enable C and Tcl programs to perform input and output using the same APIs for
manpages/XFetchBytes.3.html
XFetchBytes(3) - manipulate cut and paste buffers (ManPage)
The data can have embedded null characters and need not be null-terminated. The cut buffers contents can be retrieved later by any client calling XFetchBytes. X
