1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/**
* Copyright (C) ARM Limited 2014. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "FSDriver.h"
#include <fcntl.h>
#include <regex.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "Buffer.h"
#include "Counter.h"
#include "DriverSource.h"
#include "Logging.h"
#include "SessionData.h"
class FSCounter {
public:
FSCounter(FSCounter *next, char *name, const char *regex);
~FSCounter();
FSCounter *getNext() const { return next; }
int getKey() const { return key; }
bool isEnabled() const { return enabled; }
void setEnabled(const bool enabled) { this->enabled = enabled; }
const char *getName() const { return name; }
int64_t read();
private:
FSCounter *const next;
regex_t reg;
char *name;
const int key;
int enabled : 1,
useRegex : 1;
// Intentionally unimplemented
FSCounter(const FSCounter &);
FSCounter &operator=(const FSCounter &);
};
FSCounter::FSCounter(FSCounter *next, char *name, const char *regex) : next(next), name(name), key(getEventKey()), enabled(false), useRegex(regex != NULL) {
if (useRegex) {
int result = regcomp(®, regex, REG_EXTENDED);
if (result != 0) {
char buf[128];
regerror(result, ®, buf, sizeof(buf));
logg->logError(__FILE__, __LINE__, "Invalid regex '%s': %s", regex, buf);
handleException();
}
}
}
FSCounter::~FSCounter() {
free(name);
if (useRegex) {
regfree(®);
}
}
int64_t FSCounter::read() {
int64_t value;
if (useRegex) {
char buf[4096];
size_t pos = 0;
const int fd = open(name, O_RDONLY);
if (fd < 0) {
goto fail;
}
while (pos < sizeof(buf) - 1) {
const ssize_t bytes = ::read(fd, buf + pos, sizeof(buf) - pos - 1);
if (bytes < 0) {
goto fail;
} else if (bytes == 0) {
break;
}
pos += bytes;
}
close(fd);
buf[pos] = '\0';
regmatch_t match[2];
int result = regexec(®, buf, 2, match, 0);
if (result != 0) {
regerror(result, ®, buf, sizeof(buf));
logg->logError(__FILE__, __LINE__, "Parsing %s failed: %s", name, buf);
handleException();
}
if (match[1].rm_so < 0) {
logg->logError(__FILE__, __LINE__, "Parsing %s failed", name);
handleException();
}
char *endptr;
errno = 0;
value = strtoll(buf + match[1].rm_so, &endptr, 0);
if (errno != 0) {
logg->logError(__FILE__, __LINE__, "Parsing %s failed: %s", name, strerror(errno));
handleException();
}
} else {
if (DriverSource::readInt64Driver(name, &value) != 0) {
goto fail;
}
}
return value;
fail:
logg->logError(__FILE__, __LINE__, "Unable to read %s", name);
handleException();
}
FSDriver::FSDriver() : counters(NULL) {
}
FSDriver::~FSDriver() {
while (counters != NULL) {
FSCounter * counter = counters;
counters = counter->getNext();
delete counter;
}
}
void FSDriver::setup(mxml_node_t *const xml) {
// fs driver does not currently work with perf
if (gSessionData->perf.isSetup()) {
return;
}
mxml_node_t *node = xml;
while (true) {
node = mxmlFindElement(node, xml, "event", NULL, NULL, MXML_DESCEND);
if (node == NULL) {
break;
}
const char *counter = mxmlElementGetAttr(node, "counter");
if ((counter != NULL) && (counter[0] == '/')) {
const char *regex = mxmlElementGetAttr(node, "regex");
counters = new FSCounter(counters, strdup(counter), regex);
}
}
}
FSCounter *FSDriver::findCounter(const Counter &counter) const {
for (FSCounter * fsCounter = counters; fsCounter != NULL; fsCounter = fsCounter->getNext()) {
if (strcmp(fsCounter->getName(), counter.getType()) == 0) {
return fsCounter;
}
}
return NULL;
}
bool FSDriver::claimCounter(const Counter &counter) const {
return findCounter(counter) != NULL;
}
bool FSDriver::countersEnabled() const {
for (FSCounter *counter = counters; counter != NULL; counter = counter->getNext()) {
if (counter->isEnabled()) {
return true;
}
}
return false;
}
void FSDriver::resetCounters() {
for (FSCounter * counter = counters; counter != NULL; counter = counter->getNext()) {
counter->setEnabled(false);
}
}
void FSDriver::setupCounter(Counter &counter) {
FSCounter *const fsCounter = findCounter(counter);
if (fsCounter == NULL) {
counter.setEnabled(false);
return;
}
fsCounter->setEnabled(true);
counter.setKey(fsCounter->getKey());
}
int FSDriver::writeCounters(mxml_node_t *root) const {
int count = 0;
for (FSCounter * counter = counters; counter != NULL; counter = counter->getNext()) {
if (access(counter->getName(), R_OK) == 0) {
mxml_node_t *node = mxmlNewElement(root, "counter");
mxmlElementSetAttr(node, "name", counter->getName());
++count;
}
}
return count;
}
void FSDriver::start() {
}
void FSDriver::read(Buffer * const buffer) {
for (FSCounter * counter = counters; counter != NULL; counter = counter->getNext()) {
if (!counter->isEnabled()) {
continue;
}
buffer->event(counter->getKey(), counter->read());
}
}
|
