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resmgrd



SYNOPSIS

       resmgrd [-f configfile] [-s socket] [-p pidfile] [-kd]


DESCRIPTION

       resmgrd  is a resource manager that allows applications to
       access and lock device files.  It  supports  hot-plugging,
       i.e.  devices  can  be  added  to a resource class as they
       become available, and can be removed when unplugged.

       Devices are grouped in so-called resource  classes.   Each
       device  in  a  resource  class has an associated flag that
       defines whether applications are permitted to open it  for
       reading  and writing, or for reading only.  The devices in
       a resource class can be defined in the  static  configura­
       tion  file, but they can also be added and removed dynami­
       cally by a hotplugging daemon.

       For most purposes, having a single resource class will  be
       enough, but you can have several if you want.

       Access  control  to  device  files happens at the resource
       class level as well. Users can be  granted  the  right  to
       access  devices  from  a  certain  resource  class. Again,
       access control can be defined statically in the configura­
       tion file, or dynamically.

       Applications  communicate with resmgrd through an AF_LOCAL
       socket. When the client wants to access a device file,  it
       asks  the  resource  manager to do so. If permitted by the
       access control lists, the resource manager will  open  the
       device  file and pass the open file descriptor back to the
       client via the AF_LOCAL socket.

       Additionally, applications can use the resource manager to
       lock  and  unlock  a  device file. This happens via tradi­
       tional UUCP-style lock files in /var/lock. The  main  pur­
       pose of this is to allow applications using serial devices
       to continue using UUCP-style locks.

       All other operations, such as adding devices to a resource
       class,   or  granting  a  user  access  to  a  class,  are
       restricted to the administrator.


SEE ALSO

       resmgr.conf(5), resmgr(1).


AUTHOR

       Olaf Kirch <okir@lst.de>

                                                       resmgrd(8)
  




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