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#ifndef FILTER_H
#define FILTER_H
#include "umbrella.h"
/*
* filter_start — spawn the unit's log_filter executable as a persistent
* subprocess with stdin/stdout pipes. No-op if log_filter
* is empty. Safe to call on every unit unconditionally.
*
* filter_apply — write buf to the filter's stdin, read back the
* transformed output into buf. Updates *len. If the filter
* suppresses all output (returns 0 bytes), *len is set to 0.
* Falls back to pass-through on timeout or error.
*
* filter_stop — signal and close the filter subprocess for one unit.
* filter_stop_all — stop filters for all loaded units.
*/
void filter_start(Unit *u);
void filter_apply(Unit *u, char *buf, int bufsize, int *len);
void filter_stop(Unit *u);
void filter_stop_all(void);
#endif /* FILTER_H */
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