Hi Ravi,
That information you provided was very useful, thanks!
Regards,
Pallav
On Tuesday, February 9, 2016 2:51 PM, Pallav Bose <pallav_b...@yahoo.com>
wrote:
Hi,
I'm writing a C program to list all available interfaces and their link speed.
I can use getifaddrs(3) to obtain a list of network interfaces in a struct
ifaddrs, but none of the fields in this struct gives me information about the
negotiated link speed. From the man page of getifaddrs(3):
The ifaddrs structure contains at least the following entries:
struct ifaddrs *ifa_next; /* Pointer to next struct */
char *ifa_name; /* Interface name */
u_int ifa_flags; /* Interface flags */
struct sockaddr *ifa_addr; /* Interface address */
struct sockaddr *ifa_netmask; /* Interface netmask */
struct sockaddr *ifa_broadaddr; /* Interface broadcast address */
struct sockaddr *ifa_dstaddr; /* P2P interface destination */
void *ifa_data; /* Address specific data */
Running truss on ifconfig(8) tells me that the ioctl SIOCGIFMEDIA can be used,
but it is not clear to me how. Is there an API in C which does this already?
# truss ifconfig em0....<snipped>....
ioctl(3,SIOCGIFMAC,0xffffe210) ERR#22 'Invalid argument'
ioctl(3,SIOCGIFMEDIA,0xffffe1f0) = 0 (0x0)
ioctl(3,SIOCGIFMEDIA,0xffffe1f0) = 0 (0x0)
media: Ethernet autoselect (1000baseT <full-duplex>)
write(1,"\tmedia: Ethernet autoselect (10"...,54) = 54 (0x36)
status: active
write(1,"\tstatus: active\n",16) = 16 (0x10)
Thanks,Pallav
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