Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
CHOWN(2)		  FreeBSD System Calls Manual		      CHOWN(2)

NAME
     chown, fchown, lchown -- change owner and group of	a file

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     chown(const char *path, uid_t owner, gid_t	group);

     int
     fchown(int	fd, uid_t owner, gid_t group);

     int
     lchown(const char *path, uid_t owner, gid_t group);

DESCRIPTION
     The owner ID and group ID of the file named by path or referenced by fd
     is	changed	as specified by	the arguments owner and	group.	The owner of a
     file may change the group to a group of which he or she is	a member, but
     the change	owner capability is restricted to the super-user.

     Chown() clears the	set-user-id and	set-group-id bits on the file to pre-
     vent accidental or	mischievous creation of	set-user-id and	set-group-id
     programs if not executed by the super-user.  chown() follows symbolic
     links to operate on the target of the link	rather than the	link itself.

     Fchown() is particularly useful when used in conjunction with the file
     locking primitives	(see flock(2)).

     Lchown() is similar to chown() but	does not follow	symbolic links.

     One of the	owner or group id's may	be left	unchanged by specifying	it as
     -1.

RETURN VALUES
     Upon successful completion, the value 0 is	returned; otherwise the
     value -1 is returned and the global variable errno	is set to indicate the
     error.

ERRORS
     Chown() and lchown() will fail and	the file will be unchanged if:

     [ENOTDIR]		A component of the path	prefix is not a	directory.

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or
			an entire path name exceeded 1023 characters.

     [ENOENT]		The named file does not	exist.

     [EACCES]		Search permission is denied for	a component of the
			path prefix.

     [ELOOP]		Too many symbolic links	were encountered in translat-
			ing the	pathname.

     [EPERM]		The effective user ID is not the super-user.

     [EROFS]		The named file resides on a read-only file system.

     [EFAULT]		Path points outside the	process's allocated address
			space.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

     Fchown() will fail	if:

     [EBADF]		fd does	not refer to a valid descriptor.

     [EINVAL]		fd refers to a socket, not a file.

     [EPERM]		The effective user ID is not the super-user.

     [EROFS]		The named file resides on a read-only file system.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

SEE ALSO
     chgrp(1), chmod(2), flock(2), chown(8)

STANDARDS
     The chown() function call is expected to conform to ISO/IEC 9945-1:1990
     (``POSIX.1'').

HISTORY
     A chown() function	call appeared in Version 7 AT&T	UNIX.  The fchown()
     function call appeared in 4.2BSD.

     The chown() function was changed to follow	symbolic links in 4.4BSD.  The
     lchown() function was added in FreeBSD 3.0	to compensate for the loss of
     functionality.

FreeBSD	10.1			April 19, 1994			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS | HISTORY

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=chown&sektion=2&manpath=FreeBSD+4.8-RELEASE>

home | help