UTIMES(2)UTIMES(2)NAME
utimes, futimesat - set file access and modification times
SYNOPSIS
#include <sys/time.h>
int utimes(const char *path, const struct timeval times[2]);
int futimesat(int fildes, const char *path,
const struct timeval times[2]);
DESCRIPTION
The utimes() function sets the access and modification times of the
file pointed to by the path argument to the value of the times argu‐
ment. It allows time specifications accurate to the microsecond.
The futimesat() function also sets access and modification times. See
fsattr(5). If path is a relative path name, however, futimesat()
resolves the path relative to the fildes argument rather than the cur‐
rent working directory. If fildes is set to AT_FDCWD, defined in
<fcntl.h>, futimesat() resolves the path relative to the current work‐
ing directory. If path is a null pointer, futimesat() sets the access
and modification times on the file referenced by fildes. The fildes
argument is ignored even when futimesat() is provided with an absolute
path.
The times argument is an array of timeval structures. The first array
member represents the date and time of last access, and the second mem‐
ber represents the date and time of last modification. The times in
the timeval structure are measured in seconds and microseconds since
the Epoch, although rounding toward the nearest second may occur.
If the times argument is a null pointer, the access and modification
times of the file are set to the current time. The effective user ID
of the process must be the same as the owner of the file, or must have
write access to the file or the {PRIV_FILE_OWNER} privilege to use this
call in this manner. Upon completion, utimes() will mark the time of
the last file status change, st_ctime, for update.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, −1 is returned,
errno is set to indicate the error, and the file times will not be
affected.
ERRORS
The utimes() and futimesat() functions will fail if:
EACCES
Search permission is denied by a component of the path
prefix; or the times argument is a null pointer and the
effective user ID of the process does not match the
owner of the file and write access is denied.
EFAULT
The path or times argument points to an illegal
address. For futimesat(), path might have the value
NULL if the fildes argument refers to a valid open file
descriptor.
EINTR
A signal was caught during the execution of the
utimes() function.
EINVAL
The number of microseconds specified in one or both of
the timeval structures pointed to by times was greater
than or equal to 1,000,000 or less than 0.
EIO
An I/O error occurred while reading from or writing to
the file system.
ELOOP
Too many symbolic links were encountered in resolving
path.
ENAMETOOLONG
The length of the path argument exceeds {PATH_MAX} or a
pathname component is longer than {NAME_MAX}.
ENOLINK
The path argument points to a remote machine and the
link to that machine is no longer active.
ENOENT
A component of path does not name an existing file or
path is an empty string.
ENOTDIR
A component of the path prefix is not a directory or
the path argument is relative and the fildes argument
is not AT_FDCWD or does not refer to a valid directory.
EPERM
The times argument is not a null pointer and the call‐
ing process's effective user ID has write access to the
file but does not match the owner of the file and the
calling process does not have the appropriate privi‐
leges.
EROFS
The file system containing the file is read-only.
The utimes() and futimesat() functions may fail if:
ENAMETOOLONG
Path name resolution of a symbolic link produced an
intermediate result whose length exceeds {PATH_MAX}.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Committed │
├────────────────────┼─────────────────┤
│Standard │ See below. │
└────────────────────┴─────────────────┘
For utimes(), see standards(5).
SEE ALSOfutimens(2), stat(2), utime(2), attributes(5), fsattr(5), standards(5)
Sep 1, 2009 UTIMES(2)
