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- /****************************************************************************
- * libs/libc/modlib/modlib_symtab.c
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership. The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <assert.h>
- #include <nuttx/symtab.h>
- #include <nuttx/lib/modlib.h>
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #ifdef CONFIG_MODLIB_HAVE_SYMTAB
- /* Symbol table used by dlsym */
- # ifndef CONFIG_MODLIB_SYMTAB_ARRAY
- # error "CONFIG_MODLIB_SYMTAB_ARRAY must be defined"
- # endif
- /* Number of Symbols in the Table */
- # ifndef CONFIG_MODLIB_NSYMBOLS_VAR
- # error "CONFIG_MODLIB_NSYMBOLS_VAR must be defined"
- # endif
- #endif
- /****************************************************************************
- * Public Data
- ****************************************************************************/
- #ifdef CONFIG_MODLIB_HAVE_SYMTAB
- extern const struct symtab_s CONFIG_MODLIB_SYMTAB_ARRAY[];
- extern int CONFIG_MODLIB_NSYMBOLS_VAR;
- #endif
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- static FAR const struct symtab_s *g_modlib_symtab;
- static FAR int g_modlib_nsymbols;
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: modlib_getsymtab
- *
- * Description:
- * Get the current kernel symbol table selection as an atomic operation.
- *
- * Input Parameters:
- * symtab - The location to store the symbol table.
- * nsymbols - The location to store the number of symbols in the symbol
- * table.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void modlib_getsymtab(FAR const struct symtab_s **symtab, FAR int *nsymbols)
- {
- DEBUGASSERT(symtab != NULL && nsymbols != NULL);
- /* Borrow the registry lock to assure atomic access */
- modlib_registry_lock();
- #ifdef CONFIG_MODLIB_HAVE_SYMTAB
- if (g_modlib_symtab == NULL)
- {
- g_modlib_symtab = CONFIG_MODLIB_SYMTAB_ARRAY;
- g_modlib_nsymbols = CONFIG_MODLIB_NSYMBOLS_VAR;
- }
- #endif
- *symtab = g_modlib_symtab;
- *nsymbols = g_modlib_nsymbols;
- modlib_registry_unlock();
- }
- /****************************************************************************
- * Name: modlib_setsymtab
- *
- * Description:
- * Select a new kernel symbol table selection as an atomic operation.
- *
- * Input Parameters:
- * symtab - The new symbol table.
- * nsymbols - The number of symbols in the symbol table.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void modlib_setsymtab(FAR const struct symtab_s *symtab, int nsymbols)
- {
- /* Borrow the registry lock to assure atomic access */
- modlib_registry_lock();
- g_modlib_symtab = symtab;
- g_modlib_nsymbols = nsymbols;
- modlib_registry_unlock();
- }
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