145 lines
5.3 KiB
C
145 lines
5.3 KiB
C
/****************************************************************************
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* include/nuttx/envpath.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 __INCLUDE_NUTTX_ENVPATH_H
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#define __INCLUDE_NUTTX_ENVPATH_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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#ifdef CONFIG_LIB_ENVPATH
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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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/* ENVPATH_HANDLE is an opaque handle used to traverse the absolute paths
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* assigned to the PATH environment variable.
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*/
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typedef FAR void *ENVPATH_HANDLE;
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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: envpath_init
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*
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* Description:
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* Initialize for the traversal of each value in the PATH variable. The
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* usage is sequence is as follows:
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*
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* Input Parameters:
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* name - The variable name of environment to searches path list.
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*
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* 1) Call envpath_init() to initialize for the traversal. envpath_init()
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* will return an opaque handle that can then be provided to
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* envpath_next() and envpath_release().
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* 2) Call envpath_next() repeatedly to examine every file that lies
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* in the directories of the PATH variable
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* 3) Call envpath_release() to free resources set aside by envpath_init().
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* On success, envpath_init() return a non-NULL, opaque handle that may
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* subsequently be used in calls to envpath_next() and envpath_release().
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* On error, a NULL handle value will be returned. The most likely cause
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* of an error would be that there is no value associated with the PATH
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* variable.
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*
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****************************************************************************/
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ENVPATH_HANDLE envpath_init(FAR const char *name);
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/****************************************************************************
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* Name: envpath_next
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*
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* Description:
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* Traverse all possible values in the PATH variable in attempt to find
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* the full path to an executable file when only a relative path is
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* provided.
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*
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* Input Parameters:
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* handle - The handle value returned by envpath_init
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* relpath - The relative path to the file to be found.
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*
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* Returned Value:
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* On success, a non-NULL pointer to a null-terminated string is provided.
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* This is the full path to a file that exists in the file system. This
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* function will verify that the file exists (but will not verify that it
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* is marked executable).
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*
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* NOTE: The string pointer return in the success case points to allocated
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* memory. This memory must be freed by the called by calling kmm_free().
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*
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* NULL is returned if no path is found to any file with the provided
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* 'relpath' from any absolute path in the PATH variable. In this case,
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* there is no point in calling envpath_next() further; envpath_release()
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* must be called to release resources set aside by expath_init().
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*
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****************************************************************************/
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FAR char *envpath_next(ENVPATH_HANDLE handle, FAR const char *relpath);
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/****************************************************************************
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* Name: envpath_release
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*
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* Description:
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* Release all resources set aside by envpath_init() when the handle value
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* was created. The handle value is invalid on return from this function.
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* Attempts to all envpath_next() or envpath_release() with such a 'stale'
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* handle will result in undefined (i.e., not good) behavior.
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*
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* Input Parameters:
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* handle - The handle value returned by envpath_init
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void envpath_release(ENVPATH_HANDLE handle);
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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_LIB_ENVPATH */
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#endif /* INCLUDE_NUTTX_ENVPATH_H */
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