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/**
* 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 "DriverSource.h"
#include "Logging.h"
class FSCounter : public DriverCounter {
public:
FSCounter(DriverCounter *next, char *name, char *path, const char *regex);
~FSCounter();
const char *getPath() const { return mPath; }
int64_t read();
private:
char *const mPath;
regex_t mReg;
bool mUseRegex;
// Intentionally unimplemented
FSCounter(const FSCounter &);
FSCounter &operator=(const FSCounter &);
};
FSCounter::FSCounter(DriverCounter *next, char *name, char *path, const char *regex) : DriverCounter(next, name), mPath(path), mUseRegex(regex != NULL) {
if (mUseRegex) {
int result = regcomp(&mReg, regex, REG_EXTENDED);
if (result != 0) {
char buf[128];
regerror(result, &mReg, buf, sizeof(buf));
logg->logError(__FILE__, __LINE__, "Invalid regex '%s': %s", regex, buf);
handleException();
}
}
}
FSCounter::~FSCounter() {
free(mPath);
if (mUseRegex) {
regfree(&mReg);
}
}
int64_t FSCounter::read() {
int64_t value;
if (mUseRegex) {
char buf[4096];
size_t pos = 0;
const int fd = open(mPath, O_RDONLY | O_CLOEXEC);
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(&mReg, buf, 2, match, 0);
if (result != 0) {
regerror(result, &mReg, buf, sizeof(buf));
logg->logError(__FILE__, __LINE__, "Parsing %s failed: %s", mPath, buf);
handleException();
}
if (match[1].rm_so < 0) {
logg->logError(__FILE__, __LINE__, "Parsing %s failed", mPath);
handleException();
}
errno = 0;
value = strtoll(buf + match[1].rm_so, NULL, 0);
if (errno != 0) {
logg->logError(__FILE__, __LINE__, "Parsing %s failed: %s", mPath, strerror(errno));
handleException();
}
} else {
if (DriverSource::readInt64Driver(mPath, &value) != 0) {
goto fail;
}
}
return value;
fail:
logg->logError(__FILE__, __LINE__, "Unable to read %s", mPath);
handleException();
}
FSDriver::FSDriver() {
}
FSDriver::~FSDriver() {
}
void FSDriver::readEvents(mxml_node_t *const xml) {
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) {
continue;
}
if (counter[0] == '/') {
logg->logError(__FILE__, __LINE__, "Old style filesystem counter (%s) detected, please create a new unique counter value and move the filename into the path attribute, see events-Filesystem.xml for examples", counter);
handleException();
}
if (strncmp(counter, "filesystem_", 11) != 0) {
continue;
}
const char *path = mxmlElementGetAttr(node, "path");
if (path == NULL) {
logg->logError(__FILE__, __LINE__, "The filesystem counter %s is missing the required path attribute", counter);
handleException();
}
const char *regex = mxmlElementGetAttr(node, "regex");
setCounters(new FSCounter(getCounters(), strdup(counter), strdup(path), regex));
}
}
int FSDriver::writeCounters(mxml_node_t *root) const {
int count = 0;
for (FSCounter *counter = static_cast<FSCounter *>(getCounters()); counter != NULL; counter = static_cast<FSCounter *>(counter->getNext())) {
if (access(counter->getPath(), R_OK) == 0) {
mxml_node_t *node = mxmlNewElement(root, "counter");
mxmlElementSetAttr(node, "name", counter->getName());
++count;
}
}
return count;
}
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