when i run pserver, this error is shown:

# cvs -d server:1234:1234@192.168.100.119:/var/lib/cvsroot login
Logging in to server:1234@192.168.100.119:2401/var/lib/cvsroot

# cvs -d server:1234@192.168.100.119:/var/lib/cvsroot checkout Socketprograming/

cvs checkout: failed to create lock directory for `/var/lib/cvsroot/CVSROOT' (/var/lib/cvsroot/CVSROOT/#cvs.history.lock): Permission denied
cvs checkout: failed to obtain history lock in repository `/var/lib/cvsroot'
cvs checkout: Updating Socketprograming
cvs checkout: failed to create lock directory for `/var/lib/cvsroot/Socketprograming' (/var/lib/cvsroot/Socketprograming/#cvs.lock): Permission denied
cvs checkout: failed to obtain dir lock in repository `/var/lib/cvsroot/Socketprograming'
cvs [checkout aborted]: read lock failed - giving up

please help me

It' a permissions problem. Make sure that /var/lib/cvsroot/CVSROOT is rw by the user/group under which cvs is running and that the user (1234) belongs also to that group.

Regards