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net_dev.c
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net_dev.c
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/*************************************************************************************************************
This file is part of HWMonitor.
HWMonitor is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
HWMonitor is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with HWMonitor. If not, see <http://www.gnu.org/licenses/>.
*************************************************************************************************************/
#include <dirent.h>
#include <memory.h>
#include <math.h>
#include "net_dev.h"
#include "allocators.h"
#include "timer.h"
#include "utils.h"
void net_dev_release_cb(void* p) {
net_dev_t* dev = (net_dev_t*)p;
if (dev) {
if (dev->name)
string_release(dev->name);
if (dev->sysdir)
string_release(dev->sysdir);
if (dev->mtu)
string_release(dev->mtu);
if (dev->speed)
string_release(dev->speed);
zfree(dev);
}
}
void net_dev_scan(list_t* devs) {
struct dirent* dir = NULL;
DIR* d = opendir("/sys/class/net/");
if (d) {
while ((dir = readdir(d))) {
if (strcmp(dir->d_name, ".") == 0)
continue;
if (strcmp(dir->d_name, "..") == 0)
continue;
string* dir_name = NULL;
string_create(&dir_name, dir->d_name);
net_dev_t* dev = zalloc(sizeof(net_dev_t));
// create sysdir
string* sysdir = NULL;
string_init(&sysdir);
string_append(sysdir, "/sys/class/net/");
string_add(sysdir, dir_name);
string_append(sysdir, "/");
// set name and sysdir
string_dub(dir_name, &dev->name);
dev->sysdir = sysdir;
// getting stats
dev->mtu = file_read_subdir(sysdir, "mtu");
dev->speed = file_read_subdir(sysdir, "speed");
string* rx_bytes_s = file_read_subdir(sysdir, "statistics/rx_bytes");
string* tx_bytes_s = file_read_subdir(sysdir, "statistics/tx_bytes");
string_to_u64(rx_bytes_s, &dev->rx_bytes);
string_to_u64(tx_bytes_s, &dev->tx_bytes);
string_release(rx_bytes_s);
string_release(tx_bytes_s);
// add dev to list
list_push(devs, dev);
string_release(dir_name);
}
closedir(d);
}
}
void net_dev_diff(net_dev_t* __restrict a, net_dev_t* __restrict b, double sample_rate) {
u64 drx = b->rx_bytes - a->rx_bytes;
u64 dtx = b->tx_bytes - a->tx_bytes;
u64 ispeed = 0;
string_to_u64(b->speed, &ispeed);
ispeed /= 8; // to megabytes
ispeed *= 1024 * 1024; // to bytes
if (!ispeed)
string_append(b->speed, "0 Mbits");
else
string_append(b->speed, " Mbits");
double pure_rxtx = (double)(drx + dtx) / sample_rate;
b->bandwidth_use = pure_rxtx / (double)ispeed;
if (isnan(b->bandwidth_use))
b->bandwidth_use = 0.0;
b->rx_speed = drx / sample_rate;
b->tx_speed = dtx / sample_rate;
}
//============================================================================================================
// NET DEVICE SAMPLING
//============================================================================================================
void net_dev_get(list_t** devs) {
list_init(devs, &net_dev_release_cb);
net_dev_scan(*devs);
}
void net_dev_sample(double sample_size_sec, sampled_device_cb cb) {
list_t* devs_a = NULL;
list_t* devs_b = NULL;
net_dev_get(&devs_a);
#ifndef HW_NO_SLEEP
nsleepd(sample_size_sec);
#endif
net_dev_get(&devs_b);
list_iter_t* it = NULL;
list_iter_init(devs_a, &it);
net_dev_t* dev_a;
net_dev_t* dev_b;
while ((dev_a = list_iter_next(it))) {
list_iter_t* it2 = NULL;
list_iter_init(devs_b, &it2);
while ((dev_b = list_iter_next(it2))) {
if (string_compare(dev_a->name, dev_b->name) == ST_OK) {
net_dev_diff(dev_a, dev_b, sample_size_sec);
break;
}
}
list_iter_release(it2);
}
list_iter_release(it);
list_release(devs_a, true);
if (cb)
cb(devs_b);
}