网络2倍字节量和网速，百思不得其解。

void netdev(SamplePlugin *sample)
{FILE *fp;char s[150], itf[10];long long r1, r2, r3, r4, r5, r6, r7, r8, t1, t2, t3, t4, t5, t6, t7, t8;int i=0;sample->rb = 0;sample->tb = 0;fp = fopen("/proc/net/dev", "r");while (!feof(fp)) {fgets(s, sizeof(s), fp);if (i > 1) {sscanf(s, "%s%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld", itf, &r1, &r2, &r3, &r4, &r5, &r6, &r7, &r8, &t1, &t2, &t3, &t4, &t5, &t6, &t7, &t8);      g_message("%d\t%s", i, s);sample->rb += r1;sample->tb += t1;}i++;}fclose(fp); 
}

 fgets与feof 判断文件结尾总结_fgets读到文件末尾_Lawrence_121的博客-CSDN博客

void netdev(SamplePlugin *sample)
{FILE *fp;char s[150], itf[10];long long r1, r2, r3, r4, r5, r6, r7, r8, t1, t2, t3, t4, t5, t6, t7, t8;int i=0;sample->rb = 0;sample->tb = 0;fp = fopen("/proc/net/dev", "r");while (1) {        fgets(s, sizeof(s), fp);if (feof(fp)) {fclose(fp);break;}if (i > 1) {sscanf(s, "%s%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld%Ld", itf, &r1, &r2, &r3, &r4, &r5, &r6, &r7, &r8, &t1, &t2, &t3, &t4, &t5, &t6, &t7, &t8);      //g_message("%d\t%s", i, s);sample->rb += r1;sample->tb += t1;}i++;}
}