155 lines
5.0 KiB
C
155 lines
5.0 KiB
C
/****************************************************************************
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* sched/environ/environ.h
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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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#ifndef __SCHED_ENVIRON_ENVIRON_H
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#define __SCHED_ENVIRON_ENVIRON_H
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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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#include <nuttx/sched.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_DISABLE_ENVIRON
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# define env_dup(group, envp) (0)
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# define env_release(group) (0)
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#else
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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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:
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* The new task has a private, exact duplicate of the parent task's
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* 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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* envp - Pointer to the environment strings.
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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, FAR char * const *envp);
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/****************************************************************************
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* Name: env_release
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*
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* Description:
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* env_release() is called only from group_leave() when the last member of
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* a task group exits. The env_release() function clears the environment
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* of all name-value pairs and sets the value of the external variable
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* environ to NULL.
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*
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* Input Parameters:
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* group - Identifies the task group containing the environment structure
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* to be released.
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*
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* Returned Value:
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* None
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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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void env_release(FAR struct task_group_s *group);
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/****************************************************************************
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* Name: env_findvar
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*
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* Description:
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* Search the provided environment structure for the variable of the
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* specified name.
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*
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* Input Parameters:
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* group - The task group containing environment array to be searched.
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* pname - The variable name to find
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*
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* Returned Value:
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* A index to the name=value string in the environment
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*
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* Assumptions:
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* - Not called from an interrupt handler
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* - Pre-emption is disabled by caller
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*
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****************************************************************************/
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ssize_t env_findvar(FAR struct task_group_s *group, FAR const char *pname);
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/****************************************************************************
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* Name: env_removevar
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*
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* Description:
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* Remove the referenced name=value pair from the environment
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*
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* Input Parameters:
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* group - The task group with the environment containing the name=value
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* pair
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* index - A index to the name=value pair in the restroom
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* - Not called from an interrupt handler
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* - Caller has pre-emption disabled
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* - Caller will reallocate the environment structure to the correct size
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*
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****************************************************************************/
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void env_removevar(FAR struct task_group_s *group, ssize_t index);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* !CONFIG_DISABLE_ENVIRON */
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#endif /* __SCHED_ENVIRON_ENVIRON_H */
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