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NetBSD 6.1.5 - man page for utimes (netbsd section 2)

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UTIMES(2)			     BSD System Calls Manual				UTIMES(2)

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

LIBRARY
     Standard C Library (libc, -lc)

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 fd, const struct timeval times[2]);

     int
     futimens(int fd, const struct timespec times[2]);

     int
     utimensat(int fd, const char *path, const struct timespec times[2], int flag);

DESCRIPTION
     The access and modification times of the file named by path or referenced by fd are changed
     as specified by the argument times.

     If times is NULL, the access and modification times are set to the current time.  The caller
     must be the owner of the file, have permission to write the file, or be the super-user.

     If times is non-NULL, it is assumed to point to an array of two timeval structures.  The
     access time is set to the value of the first element, and the modification time is set to
     the value of the second element.  For file systems that support file birth (creation) times
     (such as UFS2), the birth time will be set to the value of the second element if the second
     element is older than the currently set birth time.  To set both a birth time and a modifi-
     cation time, two calls are required; the first to set the birth time and the second to set
     the (presumably newer) modification time.	Ideally a new system call will be added that
     allows the setting of all three times at once.  The caller must be the owner of the file or
     be the super-user.

     In either case, the inode-change-time of the file is set to the current time.

     lutimes() is like utimes() except in the case where the named file is a symbolic link, in
     which case lutimes() changes the access and modification times of the link, while utimes()
     changes the times of the file the link references.

     futimens() is like futimes() except that time is specified with nanosecond instead of
     microseconds.

     utimensat() also allows time to be specifed with nanoseconds.  When it operates on a sym-
     bolic link, it will change the target's time if follow is unset.  If follow is set to
     AT_SYMLINK_NOFOLLOW, the symbolic link's dates are changed.

     The nanosecond fields for futimens() and utimensat() can be set to the special value
     UTIME_NOW to set the current time, or to UTIME_OMIT to let the time unchanged (this allows
     changing access time but not modification time, and vice-versa).

     utimensat() is partially implemented.  It will return ENOSYS for fd values different than
     AT_FDCWD.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned
     and errno is set to indicate the error.

ERRORS
     utimes(), lutimes(), and utimensat() will fail if:

     [EACCES]		Search permission is denied for a component of the path prefix; or the
			times argument is NULL and the effective user ID of the process does not
			match the owner of the file, and is not the super-user, and write access
			is denied.

     [EFAULT]		path or times points outside the process's allocated address space.

     [EIO]		An I/O error occurred while reading or writing the affected inode.

     [ELOOP]		Too many symbolic links were encountered in translating the pathname.

     [ENAMETOOLONG]	A component of a pathname exceeded {NAME_MAX} characters, or an entire
			path name exceeded {PATH_MAX} characters.

     [ENOENT]		The named file does not exist.

     [ENOTDIR]		A component of the path prefix is not a directory.

     [EPERM]		The times argument is not NULL and the calling process's effective user
			ID does not match the owner of the file and is not the super-user.

     [EROFS]		The file system containing the file is mounted read-only.

     futimes() and futimens() will fail if:

     [EACCES]		The times argument is NULL and the effective user ID of the process does
			not match the owner of the file, and is not the super-user, and write
			access is denied.

     [EBADF]		fd does not refer to a valid descriptor.

     [EFAULT]		times points outside the process's allocated address space.

     [EIO]		An I/O error occurred while reading or writing the affected inode.

     [EPERM]		The times argument is not NULL and the calling process's effective user
			ID does not match the owner of the file and is not the super-user.

     [EROFS]		The file system containing the file is mounted read-only.

SEE ALSO
     stat(2), utime(3), symlink(7)

STANDARDS
     The utimes() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').  It was however marked
     as legacy in the IEEE Std 1003.1-2004 (``POSIX.1'') revision.  futimens() and utimensat()
     functions conform to IEEE Std 1003.1-2008 (``POSIX.1'').

HISTORY
     The utimes() function call appeared in 4.2BSD.  The futimes() function call appeared in
     NetBSD 1.2.  The lutimes() function call appeared in NetBSD 1.3.  Birthtime setting support
     was added in NetBSD 5.0.  futimens() and utimensat() functions calls appreared in
     NetBSD 6.0.

BUGS
     utimensat() is partially implemented.

BSD					 August 17, 2011				      BSD
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