lockdev - Man Page

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.

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

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

  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

lockdev(3).

lockdev_selinux(8).