NAME

utimes, lutimes, futimes, futimesat, futimens, utimensat - set file access and modification times

SYNOPSIS

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

int lutimes(const char *path, const struct timeval times[2]);

int futimes(int fildes, const struct timeval times[2]);

int futimesat(int fildes, const char *path,


     const struct timeval times[2]);

#include <sys/stat.h>
int futimens(int fildes, const timespec_t nstimes[2]);
int utimensat(int fildes, const char *path,


    const timespec_t nstimes[2], int flag);

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 argument. It allows time specifications accurate to the microsecond.

The lutimes() function operates like utimes() except if path points to a symbolic link; in that case lutimes() changes the access and modifications times of the link, while utimes() changes the file that is referenced by the link.

The futimes() function sets the access and modification times of the file referenced by the file descriptor fildes.

The futimesat() function also sets access and modification times. See fsattr(7). If path is a relative path name, however, futimesat() resolves the path relative to the fildes argument rather than the current working directory. If fildes is set to AT_FDCWD, defined in <fcntl.h>, futimesat() resolves the path relative to the current working 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 if 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 member 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.

The futimens() and utimensat() functions also set access and modification times; however, instead of taking struct timeval, they take timespec_t which allows for nanosecond granularity. The futimens() function sets the access and modification times on the file descriptor referenced by fildes.

The utimensat() function determines the file to set the access and modification times in an similar way to futimesat(). If the argument path is an absolute path, then the argument fildes is ignored; otherwise, path is interpreted as a path relative to the directory specified by fildes. If fildes is set to AT_FDCWD, then path is resolved relative to the current working directory. The behavior when encountering symbolic links may be controlled by the value of the flag argument. If the value of flag is the constant AT_SYMLINK_NOFOLLOW, then when a symbolic link is encountered while resolving a path, it will not be followed. Otherwise, the value of flag should be 0. Note that, unlike futimesat(), utimensat() does not accept a null pointer for the path argument.

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(), lutimes(), futimes(), futimesat(), futimens(), and utimensat() functions will fail if:

EACCES

EFAULT

EINTR

EINVAL

EIO

ELOOP

ENAMETOOLONG

ENOLINK

ENOENT

ENOTDIR

EPERM

EROFS

The utimes(), futimesat(), and utimensat() functions may fail if:

ENAMETOOLONG

ATTRIBUTES

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

For utimes(), utimensat() and futimensat(), see standards(7).

SEE ALSO

stat(2), utime(2), attributes(7), fsattr(7), standards(7)