UTIME(2) System Calls UTIME(2)

NAME

utime - set file access and modification times

SYNOPSIS

#include <sys/types.h>
#include <utime.h>

int utime(const char *path, const struct utimbuf *times);

DESCRIPTION

The utime() function sets the access and modification times of the
file pointed to by path, and causes the time of the last file status
change (st_ctime) to be updated.


If times is NULL, the access and modification times of the file are
set to the current time. A process must be the owner of the file or
have write permission to use utime() in this manner.


If times is not NULL, times is interpreted as a pointer to a utimbuf
structure (defined in <utime.h>) and the access and modification
times are set to the values contained in the designated structure.
Only the owner of the file or a process that has the
{PRIV_FILE_OWNER} privilege asserted in its effective set can use
utime() in this manner.


The utimbuf structure contains the following members:

time_t actime; /* access time */
time_t modtime; /* modification time */


The times contained in the members of the utimbuf structure are
measured in seconds since 00:00:00 UTC, January 1, 1970.

RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned
and errno is set to indicate the error.

ERRORS

The utime() function will fail if:

EACCES
Search permission is denied by a component of the
path prefix.


EACCES
The process does not have appropriate privileges and
is not the owner of the file, write permission is
denied for the file, and times is NULL.


EFAULT
The path argument points to an illegal address.


EINTR
A signal was caught during the execution of the
utime() function.


EIO
An I/O error occurred while reading from or writing
to the file system.


ELOOP
Too many symbolic links were encountered in
translating path.


ENAMETOOLONG
The length of the path argument exceeds PATH_MAX, or
the length of a path component exceeds NAME_MAX while
_POSIX_NO_TRUNC is in effect.


ENOENT
The named file does not exist or is a null pathname.


ENOLINK
The path argument points to a remote machine and the
link to that machine is no longer active.


ENOTDIR
A component of the path prefix is not a directory.


EPERM
The effective user of the calling process is not the
owner of the file, {PRIV_FILE_OWNER} is not asserted
in the effective set of the calling process, and
times is not NULL.


EROFS
The file system containing the file is mounted read-
only.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Committed |
+--------------------+-------------------+
|MT-Level | Async-Signal-Safe |
+--------------------+-------------------+
|Standard | See standards(7). |
+--------------------+-------------------+

SEE ALSO

futimens(2), stat(2), utimes(2), attributes(7), privileges(7),
standards(7)

September 1, 2009 UTIME(2)