lockdev (8) - Linux Man Pages

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
     OK               OK               not locked
     locked other     locked other     locked
     EACCES
     EROFS
     EFAULT
     EINVAL
     ENAMETOOLONG
     ENOENT
     ENOTDIR
     ENOMEM
  10      ELOOP
  11      EIO
  12      EPERM
 255      error               error               error

SEE ALSO

lockdev(3).