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31 .\" @(#)utimes.2 8.1 (Berkeley) 6/4/93
40 .Nd set file access and modification times
46 .Fn futimens "int fd" "const struct timespec times[2]"
50 .Fa "const char *path"
51 .Fa "const struct timespec times[2]"
55 The access and modification times of the file named by
59 are changed as specified by the argument
61 The inode-change-time of the file is set to the current time.
65 specifies a relative path,
66 it is relative to the current working directory if
70 and otherwise relative to the directory associated with the file descriptor
78 can be set to the special value
80 to set the current time, or to
82 to leave the time unchanged.
91 it is assumed to point to an array of two timespec structures.
92 The access time is set to the value of the first element, and the
93 modification time is set to the value of the second element.
94 For file systems that support file birth (creation) times (such as
96 the birth time will be set to the value of the second element
97 if the second element is older than the currently set birth time.
98 To set both a birth time and a modification time,
99 two calls are required; the first to set the birth time
100 and the second to set the (presumably newer) modification time.
101 Ideally a new system call will be added that allows the setting
102 of all three times at once.
107 this is equivalent to passing
108 a pointer to an array of two timespec structures
118 the timestamps remain unchanged and
119 no permissions are needed for the file itself,
120 although search permissions may be required for the path prefix.
121 The call may or may not succeed if the named file does not exist.
127 the caller must be the owner of the file, have permission to
128 write the file, or be the super-user.
130 For all other values of the timestamps,
131 the caller must be the owner of the file or be the super-user.
138 are constructed by a bitwise-inclusive OR of flags from the following list,
141 .Bl -tag -width indent
142 .It Dv AT_SYMLINK_NOFOLLOW
145 names a symbolic link, the symbolic link's times are changed.
148 changes the times of the file referenced by the symbolic link.
149 .It Dv AT_RESOLVE_BENEATH
150 Only walk paths below the directory specified by the
153 See the description of the
154 .Dv O_RESOLVE_BENEATH
161 argument is an empty string, operate on the file or directory
162 referenced by the descriptor
168 operate on the current working directory.
173 These system calls will fail if:
184 and the effective user ID of the process does not
185 match the owner of the file, and is not the super-user, and write
191 points outside the process's allocated address space.
195 component of at least one of the values specified by the
197 argument has a value less than 0 or greater than 999999999 and is not equal to
202 An I/O error occurred while reading or writing the affected inode.
204 Corrupted data was detected while reading from the file system.
218 and the calling process's effective user ID
219 does not match the owner of the file and is not the super-user.
221 The named file has its immutable or append-only flag set, see the
223 manual page for more information.
225 The file system containing the file is mounted read-only.
237 does not refer to a valid descriptor.
246 Search permission is denied for a component of the path prefix.
250 argument does not specify an absolute path and the
254 nor a valid file descriptor.
259 points outside the process's allocated address space.
261 Too many symbolic links were encountered in translating the pathname.
262 .It Bq Er ENAMETOOLONG
263 A component of a pathname exceeded
265 characters, or an entire path name exceeded
269 The named file does not exist.
271 A component of the path prefix is not a directory.
275 argument is not an absolute path and
279 nor a file descriptor associated with a directory.
280 .It Bq Er ENOTCAPABLE
283 or contained a ".." component leading to a
284 directory outside of the directory hierarchy specified by
286 and the process is in capability mode or the
287 .Dv AT_RESOLVE_BENEATH
302 system calls are expected to conform to
309 system calls appeared in