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setxattr(2) — Linux manual page

setxattr(2)                System Calls Manualsetxattr(2)

NAME        top

       setxattr, lsetxattr, fsetxattr - set an extended attribute value

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <sys/xattr.h>int setxattr(size_t size;const char *path, const char *name,const voidvalue[size], size_tsize, intflags);int lsetxattr(size_t size;const char *path, const char *name,const voidvalue[size], size_tsize, intflags);int fsetxattr(size_t size;intfd, const char *name,const voidvalue[size], size_tsize, intflags);

DESCRIPTION        top

       Extended attributes arename: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., thestat(2) data).  A complete overview of       extended attributes concepts can be found inxattr(7).setxattr() sets thevalue of the extended attribute identified byname and associated with the givenpath in the filesystem.  Thesize argument specifies the size (in bytes) ofvalue; a zero-       length value is permitted.lsetxattr() is identical tosetxattr(), except in the case of a       symbolic link, where the extended attribute is set on the link       itself, not the file that it refers to.fsetxattr() is identical tosetxattr(), only the extended       attribute is set on the open file referred to byfd (as returned       byopen(2)) in place ofpath.       An extended attribute name is a null-terminated string.  Thename       includes a namespace prefix; there may be several, disjoint       namespaces associated with an individual inode.  Thevalue of an       extended attribute is a chunk of arbitrary textual or binary data       of specified length.       By default (i.e.,flags is zero), the extended attribute will be       created if it does not exist, or the value will be replaced if the       attribute already exists.  To modify these semantics, one of the       following values can be specified inflags:XATTR_CREATE              Perform a pure create, which fails if the named attribute              exists already.XATTR_REPLACE              Perform a pure replace operation, which fails if the named              attribute does not already exist.

RETURN VALUE        top

       On success, zero is returned.  On failure, -1 is returned anderrno is set to indicate the error.

ERRORS        top

EDQUOTDisk quota limits meant that there is insufficient space              remaining to store the extended attribute.EEXIST XATTR_CREATEwas specified, and the attribute exists              already.ENODATAXATTR_REPLACEwas specified, and the attribute does not              exist.ENOSPCThere is insufficient space remaining to store the extended              attribute.ENOTSUP              The namespace prefix ofname is not valid.ENOTSUP              Extended attributes are not supported by the filesystem, or              are disabled,EPERMThe file is marked immutable or append-only.  (SeeFS_IOC_SETFLAGS(2const).)       In addition, the errors documented instat(2) can also occur.ERANGEThe size ofname orvalue exceeds a filesystem-specific              limit.

STANDARDS        top

       Linux.

HISTORY        top

       Linux 2.4, glibc 2.3.

SEE ALSO        top

getfattr(1),setfattr(1),getxattr(2),listxattr(2),open(2),removexattr(2),stat(2),symlink(7),xattr(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-06-28setxattr(2)

Pages that refer to this page:getxattr(2), io_uring_enter2(2), io_uring_enter(2), listxattr(2), open(2), removexattr(2), syscalls(2), io_uring_prep_fsetxattr(3), io_uring_prep_setxattr(3), capabilities(7), inotify(7), landlock(7), symlink(7), xattr(7)

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