OpenSource之如何获取Linux系统的网卡数目

其实只是对/proc/net/dev设备的读取并解析，代码如下：

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


int countcards(void)
{
FILE *file;
char buffer[512];
char *start;
int niccount = 0;

if (!(file = fopen("/proc/net/dev", "r"))) {
printf("Unable to open /proc/net/dev in countcards()\n");
return 0;
}

while (fgets(buffer, 512, file)) {
start = buffer;
while (*start == ' ')
start++;
if (strncmp(start, "eth", strlen("eth")) == 0)
niccount++;
}

fclose(file);

return niccount;
}



int main(int argc, char **argv)
{
int count = 0;

count = countcards();
printf("Net Cards Count:%d\n",count);


return 0;
}
运行结果：
Net Cards Count:2



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