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31 .\" @(#)utimes.2 8.1 (Berkeley) 6/4/93
39 .Nd set file access and modification times
45 .Fn futimens "int fd" "const struct timespec times[2]"
49 .Fa "const char *path"
50 .Fa "const struct timespec times[2]"
54 The access and modification times of the file named by
58 are changed as specified by the argument
60 The inode-change-time of the file is set to the current time.
64 specifies a relative path,
65 it is relative to the current working directory if
69 and otherwise relative to the directory associated with the file descriptor
77 can be set to the special value
79 to set the current time, or to
81 to leave the time unchanged.
90 it is assumed to point to an array of two timespec structures.
91 The access time is set to the value of the first element, and the
92 modification time is set to the value of the second element.
93 For file systems that support file birth (creation) times (such as
95 the birth time will be set to the value of the second element
96 if the second element is older than the currently set birth time.
97 To set both a birth time and a modification time,
98 two calls are required; the first to set the birth time
99 and the second to set the (presumably newer) modification time.
100 Ideally a new system call will be added that allows the setting
101 of all three times at once.
106 this is equivalent to passing
107 a pointer to an array of two timespec structures
117 the timestamps remain unchanged and
118 no permissions are needed for the file itself,
119 although search permissions may be required for the path prefix.
120 The call may or may not succeed if the named file does not exist.
126 the caller must be the owner of the file, have permission to
127 write the file, or be the super-user.
129 For all other values of the timestamps,
130 the caller must be the owner of the file or be the super-user.
137 are constructed by a bitwise-inclusive OR of flags from the following list,
140 .Bl -tag -width indent
141 .It Dv AT_SYMLINK_NOFOLLOW
144 names a symbolic link, the symbolic link's times are changed.
147 changes the times of the file referenced by the symbolic link.
148 .It Dv AT_RESOLVE_BENEATH
149 Only walk paths below the directory specified by the
152 See the description of the
153 .Dv O_RESOLVE_BENEATH
160 argument is an empty string, operate on the file or directory
161 referenced by the descriptor
167 operate on the current working directory.
172 These system calls will fail if:
183 and the effective user ID of the process does not
184 match the owner of the file, and is not the super-user, and write
190 points outside the process's allocated address space.
194 component of at least one of the values specified by the
196 argument has a value less than 0 or greater than 999999999 and is not equal to
201 An I/O error occurred while reading or writing the affected inode.
203 Corrupted data was detected while reading from the file system.
217 and the calling process's effective user ID
218 does not match the owner of the file and is not the super-user.
220 The named file has its immutable or append-only flag set, see the
222 manual page for more information.
224 The file system containing the file is mounted read-only.
236 does not refer to a valid descriptor.
245 Search permission is denied for a component of the path prefix.
249 argument does not specify an absolute path and the
253 nor a valid file descriptor.
258 points outside the process's allocated address space.
260 Too many symbolic links were encountered in translating the pathname.
261 .It Bq Er ENAMETOOLONG
262 A component of a pathname exceeded
264 characters, or an entire path name exceeded
268 The named file does not exist.
270 A component of the path prefix is not a directory.
274 argument is not an absolute path and
278 nor a file descriptor associated with a directory.
279 .It Bq Er ENOTCAPABLE
282 or contained a ".." component leading to a
283 directory outside of the directory hierarchy specified by
285 and the process is in capability mode or the
286 .Dv AT_RESOLVE_BENEATH
301 system calls are expected to conform to
308 system calls appeared in