_t_6_c_r_e_a_t_e__a_t_t_r creates a control block according to the attributes
specified by mmmmaaaasssskkkk.
Also note that tttt6666ccccrrrreeeeaaaatttteeee____aaaattttttttrrrr((((mmmmaaaasssskkkk)))) is equivalent to tttt6666aaaalllllllloooocccc____bbbbllllkkkk((((mmmmaaaasssskkkk)))).
RRRREEEETTTTUUUURRRRNNNN VVVVAAAALLLLUUUUEEEE
_N_U_L_L is returned and eeeerrrrrrrrnnnnoooo is set to an appropriate value, if
_t_6_c_r_e_a_t_e__a_t_t_r is unable to allocate sufficient memory for the attribute
block. Otherwise it returns the pointer to the new control block.
EEEERRRRRRRROOOORRRR
[_E_N_O_M_E_M] _t_6_c_r_e_a_t_e__a_t_t_r could not allocate the requested attribute