linux c 获取网卡流量

#include <stdio.h>
#include <string.h>

void get_network_traffic(const char *interface) {
    FILE *fp;
    char path[1024];
    char buffer[2048];
    char *line;
    unsigned long rx_bytes = 0, tx_bytes = 0;

    snprintf(path, sizeof(path), "/proc/net/dev");

    fp = fopen(path, "r");
    if (fp == NULL) {
        perror("Failed to open /proc/net/dev");
        return;
    }

    // Skip the first two lines which are headers
    fgets(buffer, sizeof(buffer), fp);
    fgets(buffer, sizeof(buffer), fp);

    while (fgets(buffer, sizeof(buffer), fp)) {
        line = strtok(buffer, ":");
        if (line != NULL) {
            line = strtok(NULL, ":");
            if (line != NULL && strstr(line, interface) != NULL) {
                sscanf(line, "%*s %lu %*s %*s %*s %*s %*s %*s %*s %lu", &rx_bytes, &tx_bytes);
                break;
            }
        }
    }

    fclose(fp);

    printf("Interface: %s
", interface);
    printf("Received bytes: %lu
", rx_bytes);
    printf("Transmitted bytes: %lu
", tx_bytes);
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s <interface>
", argv[0]);
        return 1;
    }

    get_network_traffic(argv[1]);

    return 0;
}

gcc network_traffic.c -o network_traffic
./network_traffic eth0