man/man2/utime.2

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 UTIME 2 "Sep 1, 2009"
 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is no longer active.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)