devreserv man page on Solaris

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devreserv(1M)		System Administration Commands		 devreserv(1M)

NAME
       devreserv - reserve devices for exclusive use

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

DESCRIPTION
       devreserv  reserves  devices  for  exclusive use. When the device 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.

OPERANDS
       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 integer.

EXAMPLES
       Example 1: Reserving a Floppy Disk and a Cartridge Tape

       The following example reserves a floppy disk and a cartridge tape:

       $ 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 Particular Key

       The following example lists all devices currently reserved to a partic‐
       ular key:

       $ devreserv $key
	 diskette1
	 ctape1

EXIT STATUS
       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.

FILES
       /etc/device.tab

       /etc/devlkfile

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │SUNWcsu			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       devfree(1M), attributes(5)

NOTES
       The commands devreserv and devfree are used to manage the  availability
       of devices on a system. Their use is  on a participatory 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 reservation
       has been canceled. However, processes that do not use  device  reserva‐
       tion may use a device that has been reserved since such a process would
       not have checked for its reservation status.

SunOS 5.10			  5 Jul 1990			 devreserv(1M)
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