Configuring and Managing MPE/iX Internet Services (August 2002)

Chapter 9
HP WebWise MPE/iX Secure Web Server
Shared libraries
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Shared libraries
Shared libraries (XLs) can also be used for resolving external function calls from a DSO. One method is to
relink the Apache program with an XL list of the required shared libraries and to copy each shared library
into MPE/iX namespace. Another method is to link a DSO using dependent libraries the (altxl option to the
LinkEditor) and to copy each shared library into MPE/iX namespace. Either way, all shared libraries must
reside in an MPE/iX group and account and must follow the MPE/iX naming conventions. This is necessary
because Apache is a Privileged Mode (PM) program.
Symbolic links from the MPE/iX namespace to a shared library in the HFS namespace will not satisfy the PM
capability constraint. Each shared library must actually reside in MPE/iX namespace. The following
commands show how to copy the libm and libc system shared libraries into MPE/iX namespace and how to
use the altprog option to LinkEditor to add these shared libraries to the Apache program file:
:HELLO MGR.APACHE
:XEQ SH.HPBIN.SYS -L
shell/iX> cp /lib/libm.sl XLM
shell/iX> cp /lib/libc.sl XLC
shell/iX> callci linkedit
LinkEd> buildxl xl=./hw/mod_hw.so;limit=10
LinkEd> addxl from=./hw/mod_hw.o,./hw/hw.o;to=./hw/mod_hw.so;merge;share
LinkEd> altprog ./HTTPD;cap=ia,ba,ph,pm;xl=XLM,XLC
When using system libraries as XLs, such as libm.sl and libc.sl, remember to recopy these libraries after a
system update in order to get their new versions. To verify that HTTPD has been successfully relinked with
your NMXL(s):
LinkEd> listprog ./HTTPD
PROGRAM : ./HTTPD
XL LIST : XLM XLC
CAPABILITIES : BA, IA, PM, PH