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).