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32 .\" @(#)chown.2 8.4 (Berkeley) 4/19/94
33 .\" $FreeBSD: src/lib/libc/sys/chown.2,v 1.12.2.6 2001/12/14 18:34:00 ru Exp $
34 .\" $DragonFly: src/lib/libc/sys/chown.2,v 1.2 2003/06/17 04:26:47 dillon Exp $
44 .Nd change owner and group of a file
50 .Fn chown "const char *path" "uid_t owner" "gid_t group"
52 .Fn fchown "int fd" "uid_t owner" "gid_t group"
54 .Fn lchown "const char *path" "uid_t owner" "gid_t group"
56 .Fn fchownat "int dirfd" "const char *path" "uid_t owner" "gid_t group" "int flags"
58 The owner ID and group ID of the file
63 is changed as specified by the arguments
67 The owner of a file may change the
70 he or she is a member,
73 capability is restricted to the super-user.
76 clears the set-user-id and set-group-id bits
78 to prevent accidental or mischievous creation of
79 set-user-id and set-group-id programs if not executed
82 follows symbolic links to operate on the target of the link
83 rather than the link itself.
86 is particularly useful when used in conjunction
87 with the file locking primitives (see
93 but does not follow symbolic links.
95 One of the owner or group id's
96 may be left unchanged by specifying it as -1.
100 function is equivalent to the
104 functions except in the case where the
106 specifies a relative path.
107 In this case the file to be opened is determined relative to the directory
108 associated with the file descriptor
110 instead of the current working directory.
113 is passed the special value
117 parameter, the current working directory is used
118 and the behavior is identical to a call to
125 are constructed by a bitwise-inclusive OR of flags from the following list,
128 .Bl -tag -width indent
129 .It Dv AT_SYMLINK_NOFOLLOW
132 names a symbolic link, the mode of the symbolic link is changed.
141 will fail and the file will be unchanged if:
144 A component of the path prefix or
147 .It Bq Er ENAMETOOLONG
148 A component of a pathname exceeded 255 characters,
149 or an entire path name exceeded 1023 characters.
151 The named file does not exist.
153 Search permission is denied for a component of the path prefix.
155 Too many symbolic links were encountered in translating the pathname.
157 The effective user ID is not the super-user.
159 The named file resides on a read-only file system.
162 points outside the process's allocated address space.
164 An I/O error occurred while reading from or writing to the file system.
172 does not refer to a valid descriptor.
175 refers to a socket, not a file.
177 The effective user ID is not the super-user.
179 The named file resides on a read-only file system.
181 An I/O error occurred while reading from or writing to the file system.
191 function call is expected to conform to
196 function call appeared in
206 function was changed to follow symbolic links in
210 function was added in
212 to compensate for the loss of functionality.
216 system call appeared in