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Make the distinction between "parameter import" which merges parameters, and "parameter load" which blows away any current changes.

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px4dev
2012-08-28 22:15:25 -07:00
parent f0286d1a10
commit 1a781c6c4a
3 changed files with 97 additions and 17 deletions
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apps/systemlib/param/param.h
+32 -2
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@@ -148,15 +148,31 @@ __EXPORT size_t param_size(param_t param) __attribute__((const));
__EXPORT int param_get(param_t param, void *val);
/**
* Set the scalar value of a parameter.
* Set the value of a parameter.
*
* @param param A handle returned by param_find or passed by param_foreach.
* @param val The value to set; assumed to point to a variable of the parameter type.
* For structures, the pointer is assumed to point to a copy of the structure.
* For structures, the pointer is assumed to point to a structure to be copied.
* @return Zero if the parameter's value could be set from a scalar, nonzero otherwise.
*/
__EXPORT int param_set(param_t param, const void *val);
/**
* Reset a parameter to its default value.
*
* This function frees any storage used by struct parameters, but scalar parameters
*
* @param param A handle returned by param_find or passed by param_foreach.
*/
__EXPORT void param_reset(param_t param);
/**
* Reset all parameters to their default values.
*
* This function also releases the storage used by struct parameters.
*/
__EXPORT void param_reset_all(void);
/**
* Export changed parameters to a file.
*
@@ -169,12 +185,26 @@ __EXPORT int param_export(int fd, bool only_unsaved);
/**
* Import parameters from a file, discarding any unrecognized parameters.
*
* This function merges the imported parameters with the current parameter set.
*
* @param fd File descriptor to import from. (Currently expected to be a file.)
* @return Zero on success, nonzero if an error occurred during import.
* Note that in the failure case, parameters may be inconsistent.
*/
__EXPORT int param_import(int fd);
/**
* Load parameters from a file.
*
* This function resets all parameters to their default values, then loads new
* values from a file.
*
* @param fd File descriptor to import from. (Currently expected to be a file.)
* @return Zero on success, nonzero if an error occurred during import.
* Note that in the failure case, parameters may be inconsistent.
*/
__EXPORT int param_load(int fd);
/**
* Apply a function to each parameter.
*