|UTIMES(2)||System Calls Manual||UTIMES(2)|
set file access and modification times
Standard C Library (libc, -lc)
char *path, const struct
char *path, const struct
fd, const struct timeval
fd, const char
*path, const struct
The access and modification times of the file named by path or referenced by fd are changed as specified by the argument times.
If times is
the access and modification times are set to the current time. The caller
must be the owner of the file, have permission to write the file, or be the
If times is
NULL, it is assumed to
point to an array of two timeval structures. The access time is set to the
value of the first element, and the modification time is set to the value of
the second element. For file systems that support file birth (creation)
times (such as
UFS2), the birth time will be set to
the value of the second element if the second element is older than the
currently set birth time. To set both a birth time and a modification time,
two calls are required; the first to set the birth time and the second to
set the (presumably newer) modification time. Ideally a new system call will
be added that allows the setting of all three times at once. The caller must
be the owner of the file or be the super-user.
In either case, the inode-change-time of the file is set to the current time.
system call is like
except in the case where the named file is a symbolic link, in which case
lutimes() changes the access and modification times
of the link, while
utimes() changes the times of the
file the link references.
system call is equivalent to
except in the case where path specifies a relative
path. In this case the access and modification time is set to that of a file
relative to the directory associated with the file descriptor
fd instead of the current working directory. If
futimesat() is passed the special value
AT_FDCWD in the fd parameter,
the current working directory is used and the behavior is identical to a
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
All of the system call will fail if:
- Search permission is denied for a component of the path prefix.
- The times argument is
NULLand the effective user ID of the process does not match the owner of the file, and is not the super-user, and write access is denied.
- The path or times argument points outside the process's allocated address space.
- The times argument points outside the process's allocated address space.
- The tv_usec component of at least one of the values specified by the times argument has a value less than 0 or greater than 999999.
- An I/O error occurred while reading or writing the affected inode.
- Too many symbolic links were encountered in translating the pathname.
- A component of a pathname exceeded
NAME_MAXcharacters, or an entire path name exceeded
- The named file does not exist.
- A component of the path prefix is not a directory.
- The times argument is not
NULLand the calling process's effective user ID does not match the owner of the file and is not the super-user.
- The named file has its immutable or append-only flags set. See the chflags(2) manual page for more information.
- The file system containing the file is mounted read-only.
futimes() system call will fail
- The fd argument does not refer to a valid descriptor.
In addition to the errors returned by the
may fail if:
utimes() function is expected to
conform to X/Open Portability Guide Issue 4,
Version 2 (“XPG4.2”). The
futimesat() system call follows The Open Group
Extended API Set 2 specification but was replaced by
utimensat() in IEEE Std 1003.1-2008
utimes() system call appeared in
lutimes() system calls first appeared in
FreeBSD 3.0. The
system call appeared in FreeBSD 8.0.
|June 9, 2016||Debian|