UTIMES(2) | System Calls Manual | UTIMES(2) |
utimes
, lutimes
,
futimes
, utimens
,
lutimens
, futimens
,
utimensat
—
#include <sys/time.h>
int
utimes
(const
char *path, const struct
timeval times[2]);
int
lutimes
(const
char *path, const struct
timeval times[2]);
int
futimes
(int
fd, const struct timeval
times[2]);
#include
<sys/stat.h>
int
utimens
(const
char *path, const struct
timespec times[2]);
int
lutimens
(const
char *path, const struct
timespec times[2]);
int
futimens
(int
fd, const struct timespec
times[2]);
#include
<sys/stat.h>
#include <fcntl.h>
int
utimensat
(int
fd, const char
*path, const struct
timespec times[2], int
flag);
If times is NULL
,
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
super-user.
If times is
non-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.
lutimes
() is like
utimes
() 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.
utimens
(),
lutimens
(), and futimens
()
are like utimes
(),
lutimes
(), and futimes
()
respectively except that time is specified with nanosecond instead of
microsecond precision.
utimensat
() works the same way as
utimens
() except if path is
relative. In that case, it is looked up from a directory whose file
descriptor was passed as fd. Search permission is
required on this directory. fd can be set to
AT_FDCWD
in order to specify the current
directory.
When it operates on a symbolic link,
utimensat
() will change the target's time unless
AT_SYMLINK_NOFOLLOW
is set in
flag. In that later case, the symbolic link's dates
are changed.
The nanosecond fields for utimens
(),
lutimens
(), futimens
(), and
utimensat
() can be set to the special value
UTIME_NOW
to set the current time, or to
UTIME_OMIT
to let the time unchanged (this allows
changing access time but not modification time, and vice-versa).
utimes
(), lutimes
(),
futimes
(), utimens
(),
lutimens
(), futimens
(), and
utimensat
() functions return the value 0 if
successful; otherwise the value -1 is returned and the global variable
errno is set to indicate the error.
utimes
(), lutimes
(),
utimens
(), lutimens
(), and
utimensat
() will fail if:
EACCES
]NULL
and
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.EFAULT
]EIO
]ELOOP
]ENAMETOOLONG
]NAME_MAX
}
characters, or an entire path name exceeded
{PATH_MAX
} characters.ENOENT
]ENOTDIR
]EPERM
]NULL
and the calling process's effective user ID
does not match the owner of the file and is not the super-user.EROFS
]In addition, utimensat
() will fail if:
EBADF
]AT_FDCWD
nor a
valid file descriptor open for reading or searching.ENOTDIR
]futimes
() and
futimens
() will fail if:
EACCES
]NULL
and 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.EBADF
]EFAULT
]EIO
]EPERM
]NULL
and the calling process's effective user ID
does not match the owner of the file and is not the super-user.EROFS
]utimes
() function conforms to IEEE
Std 1003.1-2001 (“POSIX.1”). It was however marked as
legacy in the IEEE Std 1003.1-2004
(“POSIX.1”) revision. futimens
()
and utimensat
() functions conform to
IEEE Std 1003.1-2008 (“POSIX.1”).
utimes
() function call appeared in
4.2BSD. The futimes
() function
call appeared in NetBSD 1.2. The
lutimes
() function call appeared in
NetBSD 1.3. Birthtime setting support was added in
NetBSD 5.0. futimens
() and
utimensat
() functions calls appeared in
NetBSD 6.0.
September 14, 2013 | NetBSD 9.2 |