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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.
153 If the running kernel does not support this system call,
154 a wrapper emulates it using
159 As a result, timestamps will be rounded down to the nearest microsecond,
162 .Dv AT_SYMLINK_NOFOLLOW
163 is not available with a path relative to a file descriptor.
165 These system calls will fail if:
176 and the effective user ID of the process does not
177 match the owner of the file, and is not the super-user, and write
183 points outside the process's allocated address space.
187 component of at least one of the values specified by the
189 argument has a value less than 0 or greater than 999999999 and is not equal to
194 An I/O error occurred while reading or writing the affected inode.
208 and the calling process's effective user ID
209 does not match the owner of the file and is not the super-user.
211 The named file has its immutable or append-only flag set, see the
213 manual page for more information.
215 The file system containing the file is mounted read-only.
227 does not refer to a valid descriptor.
236 Search permission is denied for a component of the path prefix.
240 argument does not specify an absolute path and the
244 nor a valid file descriptor.
249 points outside the process's allocated address space.
251 Too many symbolic links were encountered in translating the pathname.
252 .It Bq Er ENAMETOOLONG
253 A component of a pathname exceeded
255 characters, or an entire path name exceeded
259 The named file does not exist.
261 A component of the path prefix is not a directory.
265 argument is not an absolute path and
269 nor a file descriptor associated with a directory.
283 system calls are expected to conform to
290 system calls appeared in