centos man page for lockdev

LOCKDEV(8)																LOCKDEV(8)

NAME
       Lockdev	is  a setgid binary, which provides a reliable way to put an exclusive lock in /var/lock to devices (e.g. ttyS0) using both FSSTND
       and SVr4 methods, so regular users don't need write access there.

       This task is achieved through calls to the liblockdev(3) API.

SYNOPSIS
       /usr/sbin/lockdev [<operation>] <device>

DESCRIPTION
       The lockdev command can perform one of the following operations (calls to liblockdev(3) API):

       -l - lock device with dev_lock() function

       -u - unlock device with dev_unlock() function

       no operation - test lock with dev_testlock() function

RETURN VALUES
	  Value  dev_lock	  dev_unlock	   dev_testlock
	  0	 OK		  OK		   not locked
	  1	 locked other	  locked other	   locked
	  2	 EACCES
	  3	 EROFS
	  4	 EFAULT
	  5	 EINVAL
	  6	 ENAMETOOLONG
	  7	 ENOENT
	  8	 ENOTDIR
	  9	 ENOMEM
	 10	 ELOOP
	 11	 EIO
	 12	 EPERM
	255	 error		     error		 error

SEE ALSO
       lockdev(3).

								  SEPTEMBER 2009							LOCKDEV(8)