79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
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#include <sys/select.h>
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#include <sys/time.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#define INTERVAL 2000
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void msleep(uint64_t ms);
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void read_iface_usage(char *name, uint64_t *rx_bytes, uint64_t *tx_bytes);
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void humanize_bytes(char *str, size_t size, uint64_t bytes);
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void get_all_iface_usage(char **names, int num, uint64_t *rx, uint64_t *tx);
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int main(int argc, char **argv)
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{
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uint64_t old_rx, old_tx, new_rx, new_tx, delta_rx, delta_tx;
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char str_rx[255], str_tx[255];
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get_all_iface_usage((argv + 1), argc - 1, &old_rx, &old_tx);
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for (;;) {
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get_all_iface_usage((argv + 1), argc - 1, &new_rx, &new_tx);
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delta_rx = new_rx - old_rx; delta_tx = new_tx - old_tx;
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delta_rx /= (float)(INTERVAL / 1000.0);
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delta_tx /= (float)(INTERVAL / 1000.0);
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old_rx = new_rx; old_tx = new_tx;
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humanize_bytes(str_rx, 255, delta_rx);
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humanize_bytes(str_tx, 255, delta_tx);
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printf("[%s/s|%s/s]\n", str_rx, str_tx);
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fflush(stdout);
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msleep(INTERVAL);
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}
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}
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void msleep(uint64_t ms)
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{
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struct timeval tv;
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tv.tv_sec = ms / 1000;
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tv.tv_usec = (ms % 1000) * 1000;
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select(0, NULL, NULL, NULL, &tv);
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};
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void read_iface_usage(char *name, uint64_t *rx_bytes, uint64_t *tx_bytes)
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{
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char path_rx[255], path_tx[255];
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snprintf(path_rx, 255, "/sys/class/net/%s/statistics/rx_bytes", name);
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snprintf(path_tx, 255, "/sys/class/net/%s/statistics/tx_bytes", name);
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FILE *fd_rx = fopen(path_rx, "r"),
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*fd_tx = fopen(path_tx, "r");
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fscanf(fd_rx, "%zd", rx_bytes);
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fscanf(fd_tx, "%zd", tx_bytes);
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fclose(fd_rx);
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fclose(fd_tx);
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}
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void get_all_iface_usage(char **names, int num, uint64_t *rx, uint64_t *tx)
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{
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*rx = 0; *tx = 0;
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uint64_t trx, ttx;
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for (int i = 0; i < num; i++) {
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read_iface_usage(names[i], &trx, &ttx);
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*rx += trx;
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*tx += ttx;
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}
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}
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void humanize_bytes(char *str, size_t size, uint64_t bytes)
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{
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char prefixes[7] = "kMGTP";
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if (bytes < 1024)
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{
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snprintf(str, size, "%6.1f B", (double)bytes);
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return;
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}
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int index = (int)floor(log(bytes) / log(1024.f));
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float value = bytes / pow(1024, index);
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snprintf(str, size, "%6.1f %ciB", value, prefixes[index - 1]);
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}
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