NAME
utime —
set file times
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <utime.h>
int
utime(
const char
*file,
const struct utimbuf
*timep);
DESCRIPTION
The
utime() function sets the access and modification times of
the named file.
If
timep is
NULL
, the access and
modification times are set to the current time. The calling process must be
the owner of the file or have permission to write the file.
If
timep is non-
NULL
,
time is assumed to be a pointer to a utimbuf structure,
as defined in
<utime.h>:
struct utimbuf {
time_t actime; /* Access time */
time_t modtime; /* Modification time */
};
The access time is set to the value of the actime member, and the modification
time is set to the value of the modtime member. The times are measured in
seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970 Coordinated
Universal Time (UTC). The calling process 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.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1
is returned and
errno is set to indicate the error.
ERRORS
utime() will fail if:
-
-
- [
EACCES
]
- Search permission is denied for a component of the path
prefix; or the times argument is
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
]
- file or times
points outside the process's allocated address space.
-
-
- [
EINVAL
]
- The pathname contains a character with the high-order bit
set.
-
-
- [
EIO
]
- An I/O error occurred while reading or writing the affected
inode.
-
-
- [
ELOOP
]
- Too many symbolic links were encountered in translating the
pathname.
-
-
- [
ENAMETOOLONG
]
- A component of a pathname exceeded
{
NAME_MAX
} characters, or an entire path name
exceeded {PATH_MAX
} characters.
-
-
- [
ENOENT
]
- The named file does not exist.
-
-
- [
ENOTDIR
]
- A component of the path prefix is not a directory.
-
-
- [
EPERM
]
- The times argument is not
NULL
and the calling process's effective user ID
does not match the owner of the file and is not the super-user.
-
-
- [
EROFS
]
- The file system containing the file is mounted
read-only.
SEE ALSO
stat(2),
utimes(2)
STANDARDS
The
utime() function conforms to
IEEE Std
1003.1-1990 (“POSIX.1”). It was however marked as legacy in
the
IEEE Std 1003.1-2008 (“POSIX.1”)
revision of the standard.
HISTORY
A
utime() function appeared in
Version 7
AT&T UNIX.