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28 .\" @(#)chown.2 8.4 (Berkeley) 4/19/94
29 .\" $FreeBSD: src/lib/libc/sys/chown.2,v 1.12.2.6 2001/12/14 18:34:00 ru Exp $
30 .\" $DragonFly: src/lib/libc/sys/chown.2,v 1.2 2003/06/17 04:26:47 dillon Exp $
40 .Nd change owner and group of a file
46 .Fn chown "const char *path" "uid_t owner" "gid_t group"
48 .Fn fchown "int fd" "uid_t owner" "gid_t group"
50 .Fn lchown "const char *path" "uid_t owner" "gid_t group"
52 .Fn fchownat "int dirfd" "const char *path" "uid_t owner" "gid_t group" "int flags"
54 The owner ID and group ID of the file
59 is changed as specified by the arguments
63 The owner of a file may change the
66 he or she is a member,
69 capability is restricted to the super-user.
72 clears the set-user-id and set-group-id bits
74 to prevent accidental or mischievous creation of
75 set-user-id and set-group-id programs if not executed
78 follows symbolic links to operate on the target of the link
79 rather than the link itself.
82 is particularly useful when used in conjunction
83 with the file locking primitives (see
89 but does not follow symbolic links.
91 One of the owner or group id's
92 may be left unchanged by specifying it as -1.
96 function is equivalent to the
100 functions except in the case where the
102 specifies a relative path.
103 In this case the file to be opened is determined relative to the directory
104 associated with the file descriptor
106 instead of the current working directory.
109 is passed the special value
113 parameter, the current working directory is used
114 and the behavior is identical to a call to
121 are constructed by a bitwise-inclusive OR of flags from the following list,
124 .Bl -tag -width indent
125 .It Dv AT_SYMLINK_NOFOLLOW
128 names a symbolic link, the mode of the symbolic link is changed.
137 will fail and the file will be unchanged if:
140 A component of the path prefix or
143 .It Bq Er ENAMETOOLONG
144 A component of a pathname exceeded 255 characters,
145 or an entire path name exceeded 1023 characters.
147 The named file does not exist.
149 Search permission is denied for a component of the path prefix.
151 Too many symbolic links were encountered in translating the pathname.
153 The effective user ID is not the super-user.
155 The named file resides on a read-only file system.
158 points outside the process's allocated address space.
160 An I/O error occurred while reading from or writing to the file system.
168 does not refer to a valid descriptor.
171 refers to a socket, not a file.
173 The effective user ID is not the super-user.
175 The named file resides on a read-only file system.
177 An I/O error occurred while reading from or writing to the file system.
187 function call is expected to conform to
192 function call appeared in
202 function was changed to follow symbolic links in
206 function was added in
208 to compensate for the loss of functionality.
212 system call appeared in