C语言+shell实现linux网卡状态检测

本文实例为大家分享了C语言+shell实现linux网卡状态检测的具体代码，供大家参考，具体内容如下

不解释，直接上代码 要求linux环境具备grep和awk（awk可选）

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int get_if_status(char *if_name)
{
char  buffer[BUFSIZ];
char  cmd[100];
FILE  *read_fp;
int    chars_read;
int    ret =0;
memset( buffer, 0, BUFSIZ );
memset( cmd, 0, 100 );
sprintf(cmd, "ifconfig -a | grep %s",if_name);
read_fp = popen(cmd, "r");
if ( read_fp != NULL )
{
chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
pclose(read_fp);
if (chars_read > 0)
{
ret = 1;
}
else
{
fprintf(stderr, "%s: NO FOUND\r\n",if_name);
return 0;
}
}
if(ret == 1)
{
memset( buffer, 0, BUFSIZ );
memset( cmd, 0, 100 );
sprintf(cmd, "ifconfig |grep %s",if_name);
read_fp = popen(cmd, "r");
if ( read_fp != NULL )
{
chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
pclose(read_fp);
if (chars_read > 0)
{
ret = 2;
}
else
{
fprintf(stderr, "%s: DOWN\r\n",if_name);
return 1;
}
}
}
if(ret == 2)
{
memset( buffer, 0, BUFSIZ );
memset( cmd, 0, 100 );
sprintf(cmd, "ifconfig %s | grep RUNNING | awk '{print $3}'",if_name);
read_fp = popen(cmd, "r");
if ( read_fp != NULL )
{
chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
pclose(read_fp);
if (chars_read > 0)
{
fprintf(stderr, "%s: LINKED\r\n",if_name);
return 3;
}
else
{
fprintf(stderr, "%s: UNPLUGGED\r\n",if_name);
return 2;
}
}
}
return -1;
}
int main(int argc, char* argv[])
{
int i=0;
if(argc != 2)
{
fprintf(stderr, "usage: %s <ethname>", argv[0]);
return -1;
}
i = get_if_status(argv[1]);
printf( "if_status = %d\n", i );
return 0;
}

嵌入式编译 mips-linux-gnu-gcc -mips32 -EL -mhard-float -Wall -o netlink netlink.c

测试结果

# ./netlink eth100
eth100: NO FOUND
if_status = 0
#
# ifconfig eth0 down
# ./netlink eth0
eth0: DOWN
if_status = 1
#
# ifconfig eth0 up
# ./netlink eth0
eth0: UNPLUGGED
if_status = 2
#
# ./netlink eth0
eth0: LINKED
if_status = 3

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

您可能感兴趣的文章:

• C语言实现linux网卡检测改进版
• C语言实现linux网卡连接检测的方法
• C语言实现linux网卡检测精简版