multiple oracle databases multiple listeners of one linux server

here are the db parameters
-------------------------------
db1 - port 1521
db2 - port 1526

listener.ora of db2 (named it exproc1 in listener tag)
----------------------
# listener.ora Network Configuration File: /wc1013/ora/wc1013db/network/admin/listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /wc1013/ora/wc1013db)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1526))
    )
  )

listener.ora of db1  (named EXTPROC0 in the listener tag)
-----------------------
# listener.ora Network Configuration File: /orclportal/ora/db10/network/admin/listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /orclportal/ora/db10)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = oradb10.thekpsoft.com)
      (ORACLE_HOME = /orclportal/ora/db10)
      (SID_NAME = oradb10)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
    )
  )