Manpage of UTIME

UTIME

Section: Linux Programmer's Manual (2)
Updated: 2014-08-19
Index
 

NAME

utime, utimes - change file last access and modification times  

SYNOPSIS

#include <sys/types.h>
#include <utime.h>int utime(const char *filename, const struct utimbuf *times);#include <sys/time.h>int utimes(const char *filename, const struct timeval times[2]);
 

DESCRIPTION

Note:modern applications may prefer to use the interfaces described in utimensat(2).

The utime() system call changes the access and modification times of the inode specified by filenameto the actime and modtimefields of timesrespectively.

If timesis NULL, then the access and modification times of the file are set to the current time.

Changing timestamps is permitted when: either the process has appropriate privileges, or the effective user ID equals the user ID of the file, or timesis NULL and the process has write permission for the file.

The utimbufstructure is:

struct utimbuf {
    time_t actime;       /* access time */
    time_t modtime;      /* modification time */
};

The utime() system call allows specification of timestamps with a resolution of 1 second.

The utimes() system call is similar, but the timesargument refers to an array rather than a structure. The elements of this array are timevalstructures, which allow a precision of 1 microsecond for specifying timestamps. The timevalstructure is:

struct timeval {
    long tv_sec;        /* seconds */
    long tv_usec;       /* microseconds */
};

times[0] specifies the new access time, and times[1] specifies the new modification time. If timesis NULL, then analogously to utime(), the access and modification times of the file are set to the current time.  

RETURN VALUE

On success, zero is returned. On error, -1 is returned, and errnois set appropriately.  

ERRORS

EACCES
Search permission is denied for one of the directories in the path prefix of path(see also path_resolution(7)).
EACCES
timesis NULL, the caller's effective user ID does not match the owner of the file, the caller does not have write access to the file, and the caller is not privileged (Linux: does not have either the CAP_DAC_OVERRIDEor the CAP_FOWNERcapability).
ENOENT
filenamedoes not exist.
EPERM
timesis not NULL, the caller's effective UID does not match the owner of the file, and the caller is not privileged (Linux: does not have the CAP_FOWNERcapability).
EROFS
pathresides on a read-only filesystem.
 

CONFORMING TO

utime(): SVr4, POSIX.1-2001. POSIX.1-2008 marks utime() as obsolete.
utimes(): 4.3BSD, POSIX.1-2001.  

NOTES

Linux does not allow changing the timestamps on an immutable file, or setting the timestamps to something other than the current time on an append-only file.  

SEE ALSO

chattr(1), futimesat(2), stat(2), utimensat(2), futimens(3), futimes(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
NOTES
SEE ALSO

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