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hostlib

Index


HostLib_DropInterface() HostLib_FreeErrorStr() HostLib_GetInterface() HostLib_GetPointer()
HostLib_Lock() HostLib_Unlock()    

HostLib_DropInterface()

Synopsis

void HostLib_DropInterface(
         APTR * interface );

Function

Free an array of symbol values obtained by HostLib_GetInterface()

Inputs

interface - A pointer to values array

Result

None

Notes

This function appeared in v2 of hostlib.resource.

HostLib_FreeErrorStr()

Synopsis

void HostLib_FreeErrorStr(
         char * error );

Function

Release error description string.
In some dynamic library loaders (like in Windows) error strings
are allocated dynamically. They need to be explicitly freed
when not used any more.

Inputs

error  - Pointer to a string ro free.

Result

None.

Notes

For portability sake, it is recommended to call this function on any
error string returned by hostlib.resource. However you can omit this
if you exactly know that your code runs only on UNIX-alike operating
system (it's UNIX-specific library or driver).

HostLib_GetInterface()

Synopsis

APTR * HostLib_GetInterface(
         void * handle,
         const char ** symtable,
         ULONG * unresolved );

Function

Resolve array of symbols in the host operating system library.
The result is a pointer to a dynamically allocated array of
symbol values.

Inputs

handle     - An opaque library handle provided by HostLib_Open()
symbable   - A pointer to a NULL-terminated array of symbol names
unresolved - An optional location where count of unresolved symbols
             will be placed. Can be set to NULL to ignore it.

Result

A pointer to a dynamically allocated array of symbol values or NULL if
empty symbol table was given.

Notes

Note that the resulting array will always have as many entries as there
are in symbol names array. It some symbols (or even all of them) fail
to resolve, corresponding entries will be set to NULL. You may supply
a valid unresolved pointer if you want to get unresolved symbols count.

Even incomplete interface needs to be freed using HostLib_DropInterface().

Resulting values are valid as long as the library is open. For portability
sake it's advised to free interfaces before closing corresponding libraries.

This function appeared in v2 of hostlib.resource.

HostLib_GetPointer()

Synopsis

void * HostLib_GetPointer(
         void * handle,
         const char * symbol,
         char ** error );

HostLib_Lock()

Synopsis

void HostLib_Lock();

Function

Acquire global host OS call semaphore.

Inputs

None.

Result

None.

Notes

Host OS calls are typically not reentrant. You have to
call this function before you may use any host OS API.
Use HostLib_Unlock() function when you're done with it.

This function has negative impact on AROS multitasking, so
use it gently.

HostLib_Unlock()

Synopsis

void HostLib_Unlock();

Function

Release global host OS call semaphore.

Inputs

None.

Result

None.

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