linux系統ioctl使用示例

linux系統ioctl使用示例

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程式1：檢測介面的 inet_addr,netmask,broad_addr

程式2：檢查介面的物理連線是否正常

程式3：更簡單一點測試物理連線

程式4：調節音量

注：在網上搜尋了部分例子，發現在建立socket之後，完成操作之後都不呼叫close函式，個人嘗試了下，linux下反覆呼叫socket不關閉會導致資源消耗殆盡。

程式1：

#include #include #include #include #include #include #include #include #include #include #include static void usage()

int main(int argc,char **argv)

程式2：

#include #include #include #include #include #include #include #include #include #include typedef unsigned short u16;

typedef unsigned int u32;
typedef unsigned char u8;
#include #include int detect_mii(int skfd, char *ifname)
data = (u16 *)(&ifr.ifr_data);
phy_id = data[0];
data[1] = 1;
if (ioctl(skfd, siocgmiireg, &ifr) < 0)
mii_val = data[3];
return(((mii_val & 0x0016) == 0x0004) ? 0 : 1);
}int detect_ethtool(int skfd, char *ifname)
return (edata.data ? 0 : 1);
}int main(int argc, char **argv)
retval = detect_ethtool(skfd, ifname);
if (retval == 2)
retval = detect_mii(skfd, ifname);
close(skfd);
if (retval == 2)
printf("could not determine status\n");
if (retval == 1)
printf("link down\n");
if (retval == 0)
printf("link up\n");
return retval;
}

程式3：

#include #include #include #include #include #include #include #define linktest_glink 0x0000000a

struct linktest_value ;
static
void
usage(const char * pname)
static
intlinktest(const char * devname)
errno=0;
edata.cmd = linktest_glink;
ifr.ifr_data = (caddr_t)&edata;
if(!ioctl(fd, siocethtool, &ifr))  else 
}perror("linktest");
return errno;
}int
main(int argc, char *argv)
return linktest(argv[1]);
}

程式4：

#include #include #include #include #include #include #include #include #include #include #define base_value 257

int main(int argc,char *argv)

{ int mixer_fd=0;

char *names[sound_mixer_nrdevices]=sound_device_labels;

int value,i;

printf("\nusage:%s dev_no.[0..24] value[0..100]\n\n",argv[0]);

printf("eg. %s 0 100\n",argv[0]);

printf(" will change the volume to max volume.\n\n");

printf("the dev_no. are as below:\n");

for (i=0;i

參考：

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