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/*
* tclLoadWin.c --
*
* This procedure provides a version of dlopen() that
* works with the Windows "LoadLibrary" and "GetProcAddress"
* API for dynamic loading.
*
*/
#include "imgInt.h"
#ifdef USE_TCL_STUBS
# include "tclWinInt.h"
#else
# include <windows.h>
#endif
#include "compat/dlfcn.h"
typedef struct LibraryList {
HINSTANCE handle;
struct LibraryList *nextPtr;
} LibraryList;
static LibraryList *libraryList = NULL; /* List of currently loaded DLL's. */
/*
* Declarations for functions that are only used in this file.
*/
static void UnloadLibraries(ClientData clientData);
/*
*----------------------------------------------------------------------
*
* dlopen --
*
* This function is an alternative for the functions
* TclWinLoadLibrary and TclWinGetTclInstance. It is
* responsible for adding library handles to the library list so
* the libraries can be freed when tcl.dll is unloaded.
*
* Results:
* Returns the handle of the newly loaded library, or NULL on
* failure. If path is NULL, the global library instance handle
* is returned.
*
* Side effects:
* Loads the specified library into the process.
*
*----------------------------------------------------------------------
*/
void *dlopen(
const char *path,
int mode
) {
void *handle;
LibraryList *ptr;
static int initialized = 0;
if (!initialized) {
initialized = 1;
Tcl_CreateExitHandler((Tcl_ExitProc *) UnloadLibraries,
(ClientData) &libraryList);
}
handle = (void *) LoadLibrary(path);
if (handle != NULL) {
ptr = (LibraryList*) ckalloc(sizeof(LibraryList));
ptr->handle = (HINSTANCE) handle;
ptr->nextPtr = libraryList;
libraryList = ptr;
}
return handle;
}
/*
*----------------------------------------------------------------------
*
* dlclose --
*
* This function is an alternative for the function
* FreeLibrary. It is responsible for removing library
* handles from the library list and remove the dll
* from memory.
*
* Results:
* -1 on error, 0 on success.
*
* Side effects:
* Removes the specified library from the process.
*
*----------------------------------------------------------------------
*/
int
dlclose(
void *handle
) {
LibraryList *ptr, *prevPtr;
ptr = libraryList; prevPtr = NULL;
while (ptr != NULL) {
if (ptr->handle == (HINSTANCE) handle) {
FreeLibrary((HINSTANCE) handle);
if (prevPtr) {
prevPtr->nextPtr = ptr->nextPtr;
} else {
libraryList = ptr->nextPtr;
}
ckfree((char *) ptr);
return 0;
}
prevPtr = ptr;
ptr = ptr->nextPtr;
}
return -1;
}
/*
*----------------------------------------------------------------------
*
* dlsym --
*
* This function is an alternative for the system function
* GetProcAddress. It returns the address of a
* symbol, give the handle returned by dlopen().
*
* Results:
* Returns the address of the symbol in the dll.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void *dlsym(
void *handle,
const char *symbol
) {
return (void *) GetProcAddress((HINSTANCE) handle, symbol);
}
/*
*----------------------------------------------------------------------
*
* dlerror --
*
* This function returns a string describing the error which
* occurred in dlopen().
*
* Results:
* Returns an error message.
*
* Side effects:
* errno is set.
*
*----------------------------------------------------------------------
*/
char *
dlerror(
) {
TclWinConvertError(GetLastError());
return (char *) Tcl_ErrnoMsg(Tcl_GetErrno());
}
/*
*----------------------------------------------------------------------
*
* UnloadLibraries --
*
* Frees any dynamically allocated libraries loaded by Tcl.
*
* Results:
* None.
*
* Side effects:
* Frees the libraries on the library list as well as the list.
*
*----------------------------------------------------------------------
*/
static void
UnloadLibraries(
ClientData clientData
) {
LibraryList *ptr;
LibraryList *list = *((LibraryList **) clientData);
while (list != NULL) {
FreeLibrary(list->handle);
ptr = list->nextPtr;
ckfree((char *) list);
list = ptr;
}
}
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