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     devreserv - reserve devices for exclusive use

     devreserv [ key [device-list...]]

     devreserv reserves devices for exclusive use. When the  dev-
     ice is no longer required, use  devfree to release it.

     devreserv reserves at most one device per  device-list. Each
     list  is  searched in linear order until the first available
     device is found. If a device cannot be  reserved  from  each
     list, the entire reservation fails.

     When  devreserv is invoked without arguments, it  lists  the
     devices  that  are currently reserved and shows to which key
     it was reserved. When  devreserv is invoked  with  only  the
     key  argument,  it  lists  the  devices  that  are currently
     reserved to that key.

     The following operands are supported:

     device-list     Defines a list  of  devices  that  devreserv
                     will search to find an available device. The
                     list must be formatted as a single  argument
                     to the shell.

     key             Designates a unique key on which the  device
                     will be reserved. The key must be a positive

     Example 1: Reserving a Floppy Disk and a Cartridge Tape

     The following example reserves a floppy disk and a cartridge

     $ key=$$
     $ echo "The current Process ID is equal to: $key"
       The Current Process ID is equal to: 10658
     $ devreserv $key diskette1 ctape1

     Example 2: Listing All Devices Currently Reserved

     The following example lists all devices currently reserved:

     $ devreserv
       disk1         2423
       diskette1     10658
       ctape1        10658

     Example 3: Listing All Devices Currently Reserved to a  Par-
     ticular Key

     The following example lists all devices  currently  reserved
     to a particular key:

     $ devreserv $key

     The following exit values are returned:

     0        Successful completion.

     1        Command syntax was incorrect, an invalid was option
              used, or an internal error occurred.

     2        Device table or device reservation table could  not
              be opened for reading.

     3        Device reservation request could not be fulfilled.



     See attributes(5) for descriptions of the  following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWcsu                     |

     devfree(1M), attributes(5)

     The commands devreserv and devfree are used  to  manage  the
     availability of devices on a system. Their use is  on a par-
     ticipatory basis and they do not place any   constraints  on
     the actual access to the device. They serve as a centralized
     bookkeeping point for those who wish to  use  them.  Devices
     which  have been reserved  cannot be used by processes which
     utilize the device reservation functions until the  reserva-
     tion  has  been canceled. However, processes that do not use
     device reservation may use a device that has  been  reserved
     since such a process would not have checked for its reserva-
     tion status.

Man pages from Solaris 10 Update 8. See docs.sun.com and www.oracle.com for further documentation and Solaris information.