lockdev (8) Linux Manual 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.

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).