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1 | /* This file is part of the Linux Trace Toolkit viewer |
2 | * Copyright (C) 2003-2004 Michel Dagenais |
3 | * |
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; |
7 | * |
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. |
12 | * |
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, |
16 | * MA 02111-1307, USA. |
17 | */ |
18 | |
19 | /* The text filter facility will prompt for user filter option |
20 | * and transmit them to the lttv core */ |
21 | |
22 | #include <lttv/lttv.h> |
23 | #include <lttv/option.h> |
24 | #include <lttv/module.h> |
25 | #include <lttv/hook.h> |
26 | #include <lttv/attribute.h> |
27 | #include <lttv/iattribute.h> |
28 | #include <lttv/stats.h> |
29 | #include <lttv/filter.h> |
30 | #include <ltt/ltt.h> |
31 | #include <ltt/event.h> |
32 | #include <ltt/type.h> |
33 | #include <ltt/trace.h> |
34 | #include <ltt/facility.h> |
35 | #include <stdio.h> |
36 | |
37 | /* Insert the hooks before and after each trace and tracefile, and for each |
38 | event. Print a global header. */ |
39 | |
40 | static char |
41 | *a_file_name = NULL, |
42 | *a_filter_string = NULL; |
43 | |
44 | static LttvHooks |
45 | *before_traceset, |
46 | *event_hook; |
47 | |
48 | static FILE *a_file; |
49 | |
50 | /** |
51 | * analyses user filter options and issues the filter string |
52 | * to the core |
53 | * @param hook_data the hook data |
54 | * @param call_data the call data |
55 | */ |
56 | static void parse_filter_options(void *hook_data, void *call_data) { |
57 | |
58 | char* parsed_string=NULL; /* the string compiled from user's input */ |
59 | |
60 | /* debug */ |
61 | g_print("textFilter::parse_filter_options\n"); |
62 | |
63 | /* recovering hooks data */ |
64 | LttvTracefileContext *tfc = (LttvTracefileContext *)call_data; |
65 | |
66 | LttvTracefileState *tfs = (LttvTracefileState *)call_data; |
67 | |
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68 | // LttvTrace* lt = tfc->t_context->vt; |
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69 | |
70 | /* hook header */ |
71 | g_info("TextFilter options parser"); |
72 | |
73 | /* |
74 | * User may specify filtering options through static file |
75 | * and/or command line string. From these sources, an |
76 | * option string is rebuilded and sent to the filter core |
77 | */ |
78 | if(a_file_name != NULL) { /* -f switch in use */ |
79 | a_file = fopen(a_file_name, "r"); |
80 | if(a_file == NULL) |
81 | g_error("textFilter::parse_filter_content() cannot open file %s", a_file_name); |
82 | |
83 | fscanf(a_file,"%s",parsed_string); |
84 | |
85 | fclose(a_file); |
86 | } |
87 | if(a_filter_string != NULL) /* -s switch in use */ |
88 | parsed_string = a_filter_string; |
89 | |
90 | if(parsed_string==NULL) |
91 | g_warning("textFilter::parser_filter_options() no filtering options specified !"); |
92 | |
93 | /* send the filtering string to the core */ |
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94 | lttv_filter_new(parsed_string,tfs); |
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95 | |
96 | } |
97 | |
98 | /** |
99 | * filter to current event depending on the |
100 | * filter options tree |
101 | * @param hook_data the hook data |
102 | * @param call_data the call data |
103 | * @return success/error of operation |
104 | */ |
105 | static gboolean filter_event_content(void *hook_data, void *call_data) { |
106 | |
107 | g_print("textFilter::filter_event_content\n"); /* debug */ |
108 | } |
109 | |
110 | /** |
111 | * initialize the new module |
112 | */ |
113 | static void init() { |
114 | |
115 | g_print("textFilter::init()"); /* debug */ |
116 | |
117 | LttvAttributeValue value; |
118 | |
119 | LttvIAttribute *attributes = LTTV_IATTRIBUTE(lttv_global_attributes()); |
120 | |
121 | g_info("Init textFilter.c"); |
122 | |
123 | a_filter_string = NULL; |
124 | lttv_option_add("string", 's', |
125 | "filters a string issued by the user on the command line", |
126 | "string", |
127 | LTTV_OPT_STRING, &a_filter_string, NULL, NULL); |
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128 | // add function to call for option |
129 | |
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130 | a_file_name = NULL; |
131 | lttv_option_add("filename", 'f', |
132 | "browse the filter options contained in specified file", |
133 | "file name", |
134 | LTTV_OPT_STRING, &a_file_name, NULL, NULL); |
135 | |
136 | /* |
137 | * Note to myself ! |
138 | * LttvAttributeValue::v_pointer is a gpointer* --> void** |
139 | * see union LttvAttributeValue for more info |
140 | */ |
141 | g_assert(lttv_iattribute_find_by_path(attributes, "hooks/event", |
142 | LTTV_POINTER, &value)); |
143 | g_assert((event_hook = *(value.v_pointer)) != NULL); |
144 | lttv_hooks_add(event_hook, filter_event_content, NULL, LTTV_PRIO_DEFAULT); |
145 | |
146 | g_assert(lttv_iattribute_find_by_path(attributes,"hooks/trace/before", |
147 | LTTV_POINTER, &value)); |
148 | g_assert((before_traceset = *(value.v_pointer)) != NULL); |
149 | lttv_hooks_add(before_traceset, parse_filter_options, NULL, LTTV_PRIO_DEFAULT); |
150 | |
151 | |
152 | } |
153 | |
154 | /** |
155 | * Destroy the current module |
156 | */ |
157 | static void destroy() { |
158 | g_info("Destroy textFilter"); |
159 | |
160 | lttv_option_remove("string"); |
161 | |
162 | lttv_option_remove("filename"); |
163 | |
164 | lttv_hooks_remove_data(event_hook, filter_event_content, NULL); |
165 | |
166 | lttv_hooks_remove_data(before_traceset, parse_filter_options, NULL); |
167 | |
168 | } |
169 | |
170 | |
171 | LTTV_MODULE("textFilter", "Filters traces", \ |
172 | "Filter the trace following commands issued by user input", \ |
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173 | init, destroy, "option") |
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174 | |