1 /* This file is part of the Linux Trace Toolkit viewer
2 * Copyright (C) 2003-2004 Michel Dagenais
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License Version 2 as
6 * published by the Free Software Foundation;
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 /* A filter expression consists in nested AND, OR and NOT expressions
23 involving boolean relation (>, >=, =, !=, <, <=) between event fields and
24 specific values. It is compiled into an efficient data structure which
25 is used in functions to check if a given event or tracefile satisfies the
28 The grammar for filters is:
32 expression = "(" expression ")" | "!" expression |
33 expression "&&" expression | expression "||" expression |
36 simpleExpression = fieldPath op value
38 fieldPath = fieldComponent [ "." fieldPath ]
40 fieldComponent = name [ "[" integer "]" ]
42 value = integer | double | string
47 typedef struct _lttv_filter lttv_filter
;
50 /* Compile the filter expression into an efficient data structure */
52 lttv_filter
*lttv_filter_new(char *expression
, lttv_trace
*t
);
55 /* Check if the tracefile or event satisfies the filter. The arguments are
56 declared as void * to allow these functions to be used as hooks. */
58 bool lttv_filter_tracefile(void *filter
, void *tracefile
);
60 bool lttv_filter_event(void *filter
, void *event
);
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