Shared Library Management Routines

Initializers for Shared Libraries

 

Accessing Initializers' Addresses . Prior to the HP-UX 10.0

 

release, initializer's addresses could be accessed through the initializer

 

field of the shared library descriptor which is returned from a call to

 

shl_get(). To support multiple initializers, the shl_getsymbols()

 

routine has been enhanced to support the return of the initializer's

 

address.

 

If only one initializer is specified for a given library, its address is still

 

available through the initializer field of a shared library descriptor. If

 

more than one initializer is specified, the initializer field will be set to

 

NO_INITIALIZER. Access to multiple initializers can then be

 

accomplished through the use of shl_getsymbols(). (The

 

shl_getsymbols() routine can also access a single initializer.)

 

shl_getsymbols() may not return the initializer which was invoked

NOTE

 

for a given library if a more visible initializer symbol is defined after the

 

library being queried has been loaded. This can occur through the use of

 

shl_definesym() and by explicitly loading a more visible symbol using

 

the BIND_FIRST flag upon loading.

 

To access initializers, a new flag, INITIALIZERS, has been defined for

 

 

the shl_getsymbols() routine. It can be ORed with the NO_VALUES

 

and GLOBAL_VALUES flags. For example,

 

shl_getsymbols(handle,

 

TYPE_PROCEDURE,

 

INITIALIZERS GLOBAL_VALUES,

 

malloc,

 

&symbol_array);

 

If the GLOBAL_VALUES modifier is not used and the initializer is defined

 

in another shared library or in the program file, shl_getsymbols()

 

does not find the initializer for the requested library because it is not

 

defined within the library.

 

For more information on the usage of shl_getsymbols(), see “The

 

shl_getsymbols Routine”.

 

Example: An Initializer for Each Library

 

One way to use initializers is to define a unique initializer for each

 

library. For instance, the following example shows the source code for a

 

library named libfoo.sl that contains an initializer named init_foo:

Chapter 6

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Kenwood HP 9000 manual Example An Initializer for Each Library
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