AG_DSO * AG_LoadDSO (const char *name, const char *path, Uint flags)
int AG_SymDSO (AG_DSO *dso, const char *symbol, void **rv)
void AG_LockDSO (void)
void AG_UnlockDSO (void)
int AG_UnloadDSO (AG_DSO *dso)
AG_DSO * AG_LookupDSO (const char *name)
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The
AG_LoadDSO() function loads the dynamic library file at
path into the current process's address space.
If the library has already been loaded, the existing
AG_DSO structure is returned and its reference count incremented.
name is a string identifier for the library for use by the
AG_Object(3) system independently of the file location.
If the library was loaded successfully, a pointer to the new
AG_DSO structure is returned.
If an error has occurred return NULL with an error message.
The
AG_SymDSO() function tries to resolve the named
symbol. If successful, the value is returned into
rv and 0 is returned.
Otherwise, -1 is returned and an error message is set.
Under threads, the value returned into
rv remains valid as long as
AG_LockDSO() is in effect.
AG_SymDSO() automatically prepends an underscore to the symbol if required.
AG_LockDSO() and
AG_UnlockDSO() acquire and release the lock protecting the list of loaded libraries
and their resolved symbols.
In multithreaded applications requiring the ability to unload modules, it is
not safe to reference resolved symbols without acquiring this lock.
The
AG_UnloadDSO() function decrements the reference count of the specified
AG_DSO object.
If it reaches zero, the library is removed from the process's address space.
AG_LookupDSO() searches the list of currently loaded DSOs by the specified name.
If no match is found, NULL is returned.
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