DLL Programmer's Guide for TNS/E Systems

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DLLs on a TNS/E System

DLL Programmer’s Guide for TNS/E Systems—527252-006

1-14

User Library

A user library can also be specified at run time:



In Guardian, the run-option lib can specify the fully qualified name of the user

library:

/lib $vol.subvol.name/

Alternatively, the option with no name, /lib/, causes any libname attribute in the

program file to be ignored.



In OSS, the shell command run has a -lib option that accepts a fully qualified

Guardian file name in OSS notation:

-lib /G/vol/subvol/name

Alternatively, use -lib=unset to disregard any libname attribute in the program file.

A /lib .../ or -lib=... specification at run time does not change the libname attribute of

the program file.

Ordinary DLLs are generally more convenient, and there can be more than one, so the

use of a user library with PIC programs is not encouraged. The feature is provided

primarily for compatibility with legacy practice on NonStop systems. A user library can

also provide an "intercept" facility: because it is loaded first after the program, a user

library could export symbol definitions that take precedence over those in DLLs on the

linker-provided libList.

Figure 1-5. Loadfiles of Figure 1-4 with a User Lib and Its Library Added

Program

DLL A

DLL B

DLL C

DLL D

DLL E

Lib G

Lib F

Lib A

Lib B

Lib C

Lib F

Lib D

Lib E

Lib F

Lib G

Code

and

Data

libList

VST015.vsd

User Library

(DLL)

Lib H