Shared Library Management Routines

The shl_load Shared Library Management Routines

Look for a symbol in the data segment (for example, variables).

 

TYPE_UNDEFINED

 

Look for any symbol.

 

TYPE_STORAGE

 

32-bit mode only.

 

TYPE_TSTORAGE

 

32-bit mode only.

value

A pointer in which shl_findsym stores the address of

 

sym, if found.

Return Value

If successful, shl_findsym returns an integer (int) value zero. If shl_findsym cannot find sym, it returns −1 and sets errno to zero. If any other errors occur, shl_findsym returns −1 and sets errno to one of these values (defined in <errno.h>):

ENOEXEC

A format error was detected in the specified library.

ENOSYM

A symbol on which sym depends could not be found.

EINVAL

The specified handle is invalid.

Description

To call a routine or access data in an explicitly loaded library, first get the address of the routine or data with shl_findsym.

To call a routine in an explicitly loaded library

1.declare a pointer to a function of the same type as the function in the shared library

2.using shl_findsym with the type parameter set to

TYPE_PROCEDURE, find the symbol in the shared library and assign its address to the function pointer declared in Step 1

3.call the pointer to the function obtained in Step 2, with the correct number and type of arguments

To access data in an explicitly loaded library

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Kenwood HP 9000 manual Value, 224

HP 9000 specifications

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