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36 .Nd change owner and group of a file
42 .Fn chown "const char *path" "uid_t owner" "gid_t group"
44 .Fn fchown "int fd" "uid_t owner" "gid_t group"
46 .Fn lchown "const char *path" "uid_t owner" "gid_t group"
48 .Fn fchownat "int fd" "const char *path" "uid_t owner" "gid_t group" "int flag"
50 The owner ID and group ID of the file
55 is changed as specified by the arguments
59 The owner of a file may change the
62 he or she is a member,
65 capability is restricted to the super-user.
70 clears the set-user-id and set-group-id bits
72 to prevent accidental or mischievous creation of
73 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.
84 is particularly useful when used in conjunction
85 with the file locking primitives (see
90 system call is similar to
92 but does not follow symbolic links.
96 system call is equivalent to the
100 except in the case where
102 specifies a relative path.
103 In this case the file to be changed is determined relative to the directory
104 associated with the file descriptor
106 instead of the current working directory.
110 are constructed by a bitwise-inclusive OR of flags from the following
113 .Bl -tag -width indent
114 .It Dv AT_SYMLINK_NOFOLLOW
117 names a symbolic link, ownership of the symbolic link is changed.
118 .It Dv AT_RESOLVE_BENEATH
119 Only walk paths below the directory specified by the
122 See the description of the
123 .Dv O_RESOLVE_BENEATH
130 argument is an empty string, operate on the file or directory
131 referenced by the descriptor
137 operate on the current working directory.
142 is passed the special value
146 parameter, the current working directory is used and the behavior is identical
151 respectively, depending on whether or not the
152 .Dv AT_SYMLINK_NOFOLLOW
157 One of the owner or group id's
158 may be left unchanged by specifying it as -1.
166 will fail and the file will be unchanged if:
169 A component of the path prefix is not a directory.
170 .It Bq Er ENAMETOOLONG
171 A component of a pathname exceeded 255 characters,
172 or an entire path name exceeded 1023 characters.
174 The named file does not exist.
176 Search permission is denied for a component of the path prefix.
178 Too many symbolic links were encountered in translating the pathname.
180 The operation would change the ownership, but the effective user ID is not the
183 The named file has its immutable or append-only flag set, see the
185 manual page for more information.
187 The named file resides on a read-only file system.
192 points outside the process's allocated address space.
194 An I/O error occurred while reading from or writing to the file system.
196 Corrupted data was detected while reading from the file system.
201 system call will fail if:
207 does not refer to a valid descriptor.
212 refers to a socket, not a file.
214 The effective user ID is not the super-user.
216 The named file resides on a read-only file system.
218 An I/O error occurred while reading from or writing to the file system.
220 Corrupted data was detected while reading from the file system.
223 In addition to the errors specified for
229 system call may fail if:
234 argument does not specify an absolute path and the
238 nor a valid file descriptor open for searching.
242 argument is not valid.
246 argument is not an absolute path and
250 nor a file descriptor associated with a directory.
251 .It Bq Er ENOTCAPABLE
254 or contained a ".." component leading to a
255 directory outside of the directory hierarchy specified by
257 and the process is in capability mode or the
258 .Dv AT_RESOLVE_BENEATH
270 system call is expected to conform to
274 system call follows The Open Group Extended API Set 2 specification.
282 system call appeared in
287 system call was changed to follow symbolic links in
291 system call was added in
293 to compensate for the loss of functionality.
297 system call appeared in