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1 | /* This file is part of the Linux Trace Toolkit trace reading library |
2 | * Copyright (C) 2003-2004 Michel Dagenais |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License Version 2.1 as published by the Free Software Foundation. |
7 | * |
8 | * This library 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 GNU |
11 | * Lesser General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
16 | * Boston, MA 02111-1307, USA. |
17 | */ |
18 | |
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19 | #ifndef EVENT_H |
20 | #define EVENT_H |
21 | |
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22 | #include <glib.h> |
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23 | #include <ltt/ltt.h> |
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24 | #include <sys/types.h> |
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25 | |
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26 | LttEvent *ltt_event_new(); |
27 | |
28 | void ltt_event_destroy(LttEvent *event); |
29 | |
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30 | /* Events and their content, including the raw data, are only valid |
31 | until reading another event from the same tracefile. |
32 | Indeed, since event reading is critical to the performance, |
33 | the memory associated with an event may be reused at each read. */ |
34 | |
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35 | /* Obtain the trace unique integer id associated with the type of |
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36 | this event */ |
37 | |
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38 | unsigned ltt_event_eventtype_id(const LttEvent *e); |
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39 | |
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40 | unsigned ltt_event_facility_id(const LttEvent *e); |
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41 | |
42 | /* Facility and type for the event */ |
43 | |
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44 | LttFacility *ltt_event_facility(const LttEvent *e); |
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45 | |
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46 | LttEventType *ltt_event_eventtype(const LttEvent *e); |
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47 | |
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48 | |
49 | /* Root field for the event */ |
50 | |
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51 | LttField *ltt_event_field(LttEvent *e); |
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52 | |
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53 | |
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54 | /* Time and cycle count for the event */ |
55 | |
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56 | LttTime ltt_event_time(const LttEvent *e); |
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57 | |
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58 | LttCycleCount ltt_event_cycle_count(const LttEvent *e); |
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59 | |
60 | |
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61 | /* Obtain the position of the event within the tracefile. This |
62 | is used to seek back to this position later or to seek to another |
63 | position, computed relative to this position. The event position |
64 | structure is opaque and contains several fields, only two |
65 | of which are user accessible: block number and event index |
66 | within the block. */ |
67 | |
68 | void ltt_event_position(LttEvent *e, LttEventPosition *ep); |
69 | |
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70 | LttEventPosition * ltt_event_position_new(); |
71 | |
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72 | void ltt_event_position_get(LttEventPosition *ep, LttTracefile **tf, |
73 | guint *block, guint *offset, guint64 *tsc); |
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74 | |
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75 | gint ltt_event_position_compare(const LttEventPosition *ep1, |
76 | const LttEventPosition *ep2); |
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77 | |
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78 | void ltt_event_position_copy(LttEventPosition *dest, |
79 | const LttEventPosition *src); |
80 | |
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81 | LttTracefile *ltt_event_position_tracefile(LttEventPosition *ep); |
82 | |
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83 | /* CPU id of the event */ |
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84 | |
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85 | unsigned ltt_event_cpu_id(LttEvent *e); |
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86 | |
87 | |
88 | /* Pointer to the raw data for the event. This should not be used directly |
89 | unless prepared to do all the architecture specific conversions. */ |
90 | |
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91 | void *ltt_event_data(LttEvent *e); |
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92 | |
93 | |
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94 | /* The number of elements in a sequence field is specific to each event |
95 | instance. This function returns the number of elements for an array or |
96 | sequence field in an event. */ |
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97 | |
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98 | guint64 ltt_event_field_element_number(LttEvent *e, LttField *f); |
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99 | |
100 | |
101 | /* Set the currently selected element for a sequence or array field. */ |
102 | |
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103 | void ltt_event_field_element_select(LttEvent *e, LttField *f, unsigned i); |
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104 | |
105 | |
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106 | /* A union is like a structure except that only a single member at a time |
107 | is present depending on the specific event instance. This function tells |
108 | the active member for a union field in an event. */ |
109 | |
110 | unsigned ltt_event_field_union_member(LttEvent *e, LttField *f); |
111 | |
112 | |
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113 | /* These functions extract data from an event after architecture specific |
114 | conversions. */ |
115 | |
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116 | guint32 ltt_event_get_unsigned(LttEvent *e, LttField *f); |
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117 | |
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118 | gint32 ltt_event_get_int(LttEvent *e, LttField *f); |
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119 | |
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120 | guint64 ltt_event_get_long_unsigned(LttEvent *e, LttField *f); |
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121 | |
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122 | gint64 ltt_event_get_long_int(LttEvent *e, LttField *f); |
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123 | |
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124 | float ltt_event_get_float(LttEvent *e, LttField *f); |
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125 | |
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126 | double ltt_event_get_double(LttEvent *e, LttField *f); |
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127 | |
128 | |
129 | /* The string obtained is only valid until the next read from |
130 | the same tracefile. */ |
131 | |
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132 | gchar *ltt_event_get_string(LttEvent *e, LttField *f); |
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133 | |
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134 | size_t get_field_type_size(LttTracefile *tf, |
135 | LttEventType *event_type, |
136 | off_t offset_root, off_t offset_parent, |
137 | LttField *field, void *data); |
138 | |
139 | |
140 | |
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141 | #endif // EVENT_H |