Xinu7/contrib/distodt/man/bed.doc

BED(1)              UNIX Programmer's Manual               BED(1)



NNNNAAAAMMMMEEEE
     bed - backend daemon process that runs on frontend machine

SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
     bbbbeeeedddd

DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     _B_e_d is the BBBBackEEEEnd DDDDaemon that runs on the frontend machine.
     It accepts status, odt, and download requests from other
     frontends and then services these requests.  It reads the
     configuration of the backend machines it needs to service
     from a _M_a_c_h_i_n_e_s _d_a_t_a_b_a_s_e, and it keeps lock files for each
     reserved backend machine.

     _B_e_d can be run by anyone - it is not a setuid program.  It
     runs in the background, so after typing _b_e_d it returns
     immediately.  _B_e_d actually starts 2 processes running in the
     background, a parent process and one child process.  The
     parent process simply starts the child process and then
     waits for it to die.  The child process is the _r_e_a_l BED pro-
     cess.  It is the one that services requests from other fron-
     tends.  If for some reason the child process dies the parent
     detects it and restarts a new child process as the BED pro-
     cess.  This insures that the BED process will always be run-
     ning.

     _S_t_a_t_u_s requests are replied to immediately, but _o_d_t and
     _d_o_w_n_l_o_a_d requests cause a new process to be forked off to
     handle the request. Currently the _o_d_t and _d_o_w_n_l_o_a_d built
     into the BED only work when connected to a backend SSSSUUUUNNNN.
     Thus the BED process should only be run on frontends that
     have a SSSSUUUUNNNN as one of the backends.

FFFFIIIILLLLEEEESSSS
     /usr/xinu/database/machine  Backend machines database
     /tmp/xinu/*  Backend reservation lock files

SSSSEEEEEEEE AAAALLLLSSSSOOOO
     bedkill(1), bedreboot(1)

BBBBUUUUGGGGSSSS
     Currently the _o_d_t and _d_o_w_n_l_o_a_d built into the BED only work
     when connected to a backend SSSSUUUUNNNN.  Thus the BED process
     should only be run on frontends that have a SSSSUUUUNNNN as one of
     the backends.










Printed 6/11/88                                                 1