107 lines
3.9 KiB
C
107 lines
3.9 KiB
C
/****************************************************************************
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* include/nuttx/environ.h
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_ENVIRON_H
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#define __INCLUDE_NUTTX_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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#ifndef CONFIG_DISABLE_ENVIRON
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* Callback function used with env_foreach() */
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typedef CODE int (*env_foreach_t)(FAR void *arg, FAR const char *pair);
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/****************************************************************************
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* Public Function Prototypes
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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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* Name: env_foreach
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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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* This is an internal OS function and should not be used by applications.
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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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* cb - The callback function to be invoked for each environment
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* variable.
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*
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* Returned Value:
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* Zero if the all environment variables have been traversed. A non-zero
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* value means that the callback function requested early termination by
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* returning a nonzero value.
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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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struct task_group_s; /* Forward reference */
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int env_foreach(FAR struct task_group_s *group, env_foreach_t cb,
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FAR void *arg);
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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 /* __INCLUDE_NUTTX_ENVIRON_H */
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