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to that machine is no longer active.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(5) for descriptions of the following attributes:


+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Committed |
+--------------------+-------------------+
|MT-Level | Async-Signal-Safe |
+--------------------+-------------------+
|Standard | See standards(5). |
+--------------------+-------------------+

SEE ALSO


futimens(2), stat(2), utimes(2), attributes(5), privileges(5),
standards(5)


September 1, 2009 UTIME(2)