fcntl_getlease(9) [centos man page]

FCNTL_GETLEASE(9)						   The Linux VFS						 FCNTL_GETLEASE(9)

NAME

       fcntl_getlease - Enquire what lease is currently active

SYNOPSIS

       int fcntl_getlease(struct file * filp);

ARGUMENTS

       filp
	   the file

DESCRIPTION

       The value returned by this function will be one of (if no lease break is pending):

       F_RDLCK to indicate a shared lease is held.

       F_WRLCK to indicate an exclusive lease is held.

       F_UNLCK to indicate no lease is held.

       (if a lease break is pending):

       F_RDLCK to indicate an exclusive lease needs to be changed to a shared lease (or removed).

       F_UNLCK to indicate the lease needs to be removed.

XXX

       sfr & willy disagree over whether F_INPROGRESS should be returned to userspace.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							 FCNTL_GETLEASE(9)

auto_parms(1M)															    auto_parms(1M)

NAME

       auto_parms - initial system configuration plus DHCP support command

SYNOPSIS

DESCRIPTION

       The  command is a system initialization command that handles first-boot configuration, that is, the setting of unique system "initial iden-
       tity parameters", and ongoing management of DHCP lease(s).  The command is invoked at boot time by the command.	Initially it loads a  list
       of  available ethernet interfaces and requests a DHCP lease on each interface.  See the rc(1M) manpage for information about for invocation
       context.

       While checking for availability of a lease on each interface, also consults and examines the variable If it is  set  to	"1",  attempts	to
       request a lease on the the interface designated by If is set to "0" (the default case) or is absent from does not attempt a DHCP request on
       that interface.

       Once a lease is secured, the information supplied with the lease is used to initialize key networking parameters; see dhcpdb2conf(1M).

       If detects that the system is undergoing "first-boot" (meaning the system's hostname is not yet set), it invokes to  verify  the  DHCP-sup-
       plied parameters and to collect any parameters not supplied by DHCP.

       For  all  subsequent  boots,  the data supplied by a DHCP lease is assumed by to be correct.  Note that in a (non-mobile) environment where
       DHCP is used for IP address management, under normal conditions the lease information should not change between reboots.   This	is  accom-
       plished by placing in "lease maintenance mode" prior to exiting.

FILES

       The command itself.

       Common subroutines used by
				and sub-area commands.

       Log files written and saved by

       AUTHOR
	      The command was developed by HP.

SEE ALSO

       dhcpdb2conf(1M), rc(1M), set_parms(1M).

																    auto_parms(1M)