Welcome to the Linux Foundation Forum!
EMAC Link Status
VFaul
Posts: 4
In C code, I'm trying to retrieve the emac link status, speed, and duplex. I made a system call to "cat /proc/net/emac_link" and parsed the output. But this takes WAY too much time (around 75ms). Is there a faster (and better) way to get this information, say, through a driver IOCTL?
0
Comments
-
#include <errno.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>
#include <net/if.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
int main ( int argc, char **argv )
{
struct ifreq ifr;
int sock = socket ( AF_INET, SOCK_DGRAM, 0 );
struct ethtool_cmd edata;
char ifname[32];
int result;
strcpy ( ifname, "eth0" );
strncpy ( ifr.ifr_name, ifname, sizeof ( ifr.ifr_name ));
ifr.ifr_addr.sa_family = AF_INET;
result = ioctl ( sock, SIOCGIFFLAGS, &ifr );
if ( result == 0 ) {
// successfully got the flags
if ( ifr.ifr_flags | IFF_UP ) {
printf ( "Ethernet interface is up\n" );
}
else {
printf ( "Ethernet interface is down\n" );
}
}
else {
printf ( "%s: Error getting ethernet flags. %s (%d)\n",
__FUNCTION__,
strerror ( errno ),
errno );
}
ifr.ifr_data = (char *) &edata;
edata.cmd = ETHTOOL_GSET;
result = ioctl ( sock, SIOCETHTOOL, &ifr );
if ( result == 0 ) {
switch ( edata.speed ) {
case SPEED_10:
printf ( "Speed is 10Mbps\n" );
break;
case SPEED_100:
printf ( "Speed is 100Mbps\n" );
break;
case SPEED_1000:
printf ( "Speed is 1Gbps\n" );
break;
case SPEED_10000:
printf ( "Speed is 10Gbps\n" );
break;
default:
printf ( "Speed (%d) is unknown\n", edata.speed );
break;
}
if ( edata.duplex == DUPLEX_HALF ){
printf ( "Half duplex\n" );
}
else {
printf ( "Full duplex\n" );
}
}
else {
printf ( "%s: Error getting ethernet info. %s (%d)\n",
__FUNCTION__,
strerror ( errno ),
errno );
}
return 0;
}0
Categories
- All Categories
- 217 LFX Mentorship
- 217 LFX Mentorship: Linux Kernel
- 791 Linux Foundation IT Professional Programs
- 353 Cloud Engineer IT Professional Program
- 178 Advanced Cloud Engineer IT Professional Program
- 82 DevOps Engineer IT Professional Program
- 147 Cloud Native Developer IT Professional Program
- 137 Express Training Courses
- 137 Express Courses - Discussion Forum
- 6.2K Training Courses
- 47 LFC110 Class Forum - Discontinued
- 70 LFC131 Class Forum
- 42 LFD102 Class Forum
- 226 LFD103 Class Forum
- 18 LFD110 Class Forum
- 38 LFD121 Class Forum
- 18 LFD133 Class Forum
- 7 LFD134 Class Forum
- 18 LFD137 Class Forum
- 71 LFD201 Class Forum
- 4 LFD210 Class Forum
- 5 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 2 LFD233 Class Forum
- 4 LFD237 Class Forum
- 24 LFD254 Class Forum
- 697 LFD259 Class Forum
- 111 LFD272 Class Forum
- 4 LFD272-JP クラス フォーラム
- 12 LFD273 Class Forum
- 148 LFS101 Class Forum
- 1 LFS111 Class Forum
- 3 LFS112 Class Forum
- 2 LFS116 Class Forum
- 4 LFS118 Class Forum
- LFS120 Class Forum
- 7 LFS142 Class Forum
- 5 LFS144 Class Forum
- 4 LFS145 Class Forum
- 2 LFS146 Class Forum
- 3 LFS147 Class Forum
- 1 LFS148 Class Forum
- 15 LFS151 Class Forum
- 2 LFS157 Class Forum
- 26 LFS158 Class Forum
- 7 LFS162 Class Forum
- 2 LFS166 Class Forum
- 4 LFS167 Class Forum
- 3 LFS170 Class Forum
- 2 LFS171 Class Forum
- 3 LFS178 Class Forum
- 3 LFS180 Class Forum
- 2 LFS182 Class Forum
- 5 LFS183 Class Forum
- 31 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 3 LFS201-JP クラス フォーラム
- 18 LFS203 Class Forum
- 134 LFS207 Class Forum
- 2 LFS207-DE-Klassenforum
- 1 LFS207-JP クラス フォーラム
- 302 LFS211 Class Forum
- 56 LFS216 Class Forum
- 52 LFS241 Class Forum
- 48 LFS242 Class Forum
- 38 LFS243 Class Forum
- 15 LFS244 Class Forum
- 2 LFS245 Class Forum
- LFS246 Class Forum
- 48 LFS250 Class Forum
- 2 LFS250-JP クラス フォーラム
- 1 LFS251 Class Forum
- 152 LFS253 Class Forum
- 1 LFS254 Class Forum
- 1 LFS255 Class Forum
- 7 LFS256 Class Forum
- 1 LFS257 Class Forum
- 1.2K LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 118 LFS260 Class Forum
- 159 LFS261 Class Forum
- 42 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 24 LFS267 Class Forum
- 22 LFS268 Class Forum
- 30 LFS269 Class Forum
- LFS270 Class Forum
- 202 LFS272 Class Forum
- 2 LFS272-JP クラス フォーラム
- 1 LFS274 Class Forum
- 4 LFS281 Class Forum
- 9 LFW111 Class Forum
- 259 LFW211 Class Forum
- 181 LFW212 Class Forum
- 13 SKF100 Class Forum
- 1 SKF200 Class Forum
- 1 SKF201 Class Forum
- 795 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 102 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 85 Storage
- 758 Linux Distributions
- 82 Debian
- 67 Fedora
- 17 Linux Mint
- 13 Mageia
- 23 openSUSE
- 148 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 353 Ubuntu
- 468 Linux System Administration
- 39 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 93 Linux Security
- 78 Network Management
- 102 System Management
- 47 Web Management
- 63 Mobile Computing
- 18 Android
- 33 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 371 Off Topic
- 114 Introductions
- 174 Small Talk
- 22 Study Material
- 805 Programming and Development
- 303 Kernel Development
- 484 Software Development
- 1.8K Software
- 261 Applications
- 183 Command Line
- 3 Compiling/Installing
- 987 Games
- 317 Installation
- 97 All In Program
- 97 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)