Shared Library Management Routines

 

Initializers for Shared Libraries

 

For example, to create a shared library named libfoo.sl that uses an

 

initializer named init_foo, use this linker command line:

 

$ ld -b -o libfoo.sl libfoo.o +I init_foo

 

Order of Execution of Multiple Initializers . Multiple

 

initializers are executed in the same order that they appear on the

 

command line; they are unloaded in reverse order. (This applies only to

 

the calling order within a shared library, not across multiple shared

 

libraries.)

 

 

Initializers are not executed when unloading shared libraries which were

NOTE

 

implicitly loaded since the program exits without re-entering the

 

dynamic loader to unload them. Initializers are only called during the

 

explicit unloading of a shared library.

 

Initializers behave the same as other symbols; once they are bound they

 

 

cannot be overridden with a new symbol through the use of

 

shl_definesym() or by loading a more visible occurrence of the

 

initializer symbol with the BIND_FIRST flag. What this means is that

 

once the initializer is executed upon a load, it is guaranteed to be the

 

same initializer that is called on an explicit unload.

 

Initializer Syntax

 

void initializer( shl_t handle,

 

 

int loading )

 

initializer

The name of the initializer as specified with the +I

 

 

linker option.

 

handle

The initializer is called with this parameter set to the

 

 

handle of the shared library for which it was invoked.

 

loading

The initializer is called with this parameter set to −1

 

 

(true) when the shared library is loaded and 0 (false)

 

 

when the library is unloaded.

The initializers cannot be defined as local definitions. Initializers cannot be hidden through the use of the -hoption when building a shared library.

It is strongly recommended that initializers be defined with names which do not cause name collisions with other user-defined names in order to avoid overriding behavior of shared library symbol binding.

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Chapter 6

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Kenwood HP 9000 manual Initializer Syntax, Handle, Loading, 204

HP 9000 specifications

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