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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
     prevent 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
                        translating 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 IEEE Std 1003.1-1990
     (``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 11.0-PRERELEASE         April 19, 1994         FreeBSD 11.0-PRERELEASE

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

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