50578dc501
- User mode allocator was used for setting up the environment. This works in flat mode and probably in protected mode as well, as there is always a a single user allocator present - This does not work in kernel mode, where each user task has its own heap allocator. Also, when the idle tasks environment is being set, no allocator is ready and the system crashes at once. Fix this by using the group allocators instead: - Idle task is a kernel task, so its group is privileged - Add group_realloc - Use the group_malloc/realloc functions instead of kumm_malloc
126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/****************************************************************************
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* sched/environ/env_dup.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef CONFIG_DISABLE_ENVIRON
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#include <sys/types.h>
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#include <sched.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/kmalloc.h>
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#include "sched/sched.h"
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#include "environ/environ.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: env_dup
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*
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* Description:
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* Copy the internal environment structure of a task. This is the action
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* that is performed when a new task is created: The new task has a
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* private, exact duplicate of the parent task's environment.
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*
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* Input Parameters:
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* group - The child task group to receive the newly allocated copy of the
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* parent task groups environment structure.
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*
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* Returned Value:
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* zero on success
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*
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* Assumptions:
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* Not called from an interrupt handler.
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*
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****************************************************************************/
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int env_dup(FAR struct task_group_s *group)
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{
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FAR struct tcb_s *ptcb = this_task();
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FAR char *envp = NULL;
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size_t envlen;
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int ret = OK;
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DEBUGASSERT(group != NULL && ptcb != NULL && ptcb->group != NULL);
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/* Pre-emption must be disabled throughout the following because the
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* environment may be shared.
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*/
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sched_lock();
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/* Does the parent task have an environment? */
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if (ptcb->group != NULL && ptcb->group->tg_envp != NULL)
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{
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/* Yes.. The parent task has an environment allocation. */
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envlen = ptcb->group->tg_envsize;
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envp = NULL;
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/* A special case is that the parent has an "empty" environment
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* allocation, i.e., there is an allocation in place but it
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* contains no variable definitions and, hence, envlen == 0.
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*/
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if (envlen > 0)
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{
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/* There is an environment, duplicate it */
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envp = (FAR char *)group_malloc(ptcb->group, envlen);
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if (envp == NULL)
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{
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/* The parent's environment can not be inherited due to a
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* failure in the allocation of the child environment.
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*/
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envlen = 0;
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ret = -ENOMEM;
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}
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else
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{
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/* Duplicate the parent environment. */
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memcpy(envp, ptcb->group->tg_envp, envlen);
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}
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}
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/* Save the size and child environment allocation. */
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group->tg_envsize = envlen;
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group->tg_envp = envp;
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}
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sched_unlock();
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return ret;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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