bbwwrriittee() -- Block-Device Routine

#iinncclluuddee <ssyyss/bbuuff.hh>
vvooiidd
bbwwrriittee(_b_p, _f_l_a_g)
BBUUFF *_b_p;

bbwwrriittee writes out the buffer pointed to by _b_p. If _f_l_a_g is set, the write is
synchronous,  and bbwwrriittee()  will not  return until  the I/O  has completed;
otherwise, it is asynchronous and bbwwrriittee() returns immediately.

A device driver  must first lock the buffer gate  before it calls bbwwrriittee();
otherwise, the buffer may be modified while it is being written.

_S_e_e _A_l_s_o
bblloocckk-ddeevviiccee rroouuttiinneess
