Help me, please ORA-28576: lost RPC connection to external procedure agent

Question

when i call external program
SQL>exec shell_all ('/bin/ls /oracle/product/10.2.0/',:result, 3) ;
BEGIN shell_all ('/bin/ls /oracle/product/10.2.0/',:result, 3) ; END;
ERROR at line 1:
ORA-28576: lost RPC connection to external procedure agent
ORA-06512: at "SYS.SHELL_ALL", line 1
ORA-06512: at line 1
and my configure
#listener.ora
SID_LIST_LISTENER_AADB02 =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /oracle/product/10.2.0/db)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ANY")
LISTENER_AADB02 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = aadb02-vip)(PORT = 1521)(IP = FIRST))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 203.144.222.82)(PORT = 1521)(IP = FIRST))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = extproc))
#tnsname.ora
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = extproc))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
Please tell me to resolve this problem

Answer 1

Does not execl() and friends replace the current program with the one supplied as a parameter?
The upshot of this would be as you suggest, viz:
- Oracle call's your procedure (but doens't wait for a result due to the void return type?)
- your program executes its code (cd /tmp)
- it then replaces itself with *program
- *program terminates
Presumably, Oracle isn't expecting it to terminate but to continue waiting for subsequent requests.
I'd check out fork() and see if that offers more appropriate semantics.
d.