lockdev (8) - Linux Manuals

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