Date: Fri, 12 Feb 2016 18:02:47 +0000 (UTC) From: Pallav Bose <pallav_bose@yahoo.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Cc: "rpokala@mac.com" <rpokala@mac.com> Subject: Re: C program API to determine negotiated link speed of a network interface? Message-ID: <604939402.3154674.1455300167449.JavaMail.yahoo@mail.yahoo.com> In-Reply-To: <249322925.1631277.1455058288002.JavaMail.yahoo@mail.yahoo.com> References: <249322925.1631277.1455058288002.JavaMail.yahoo.ref@mail.yahoo.com> <249322925.1631277.1455058288002.JavaMail.yahoo@mail.yahoo.com>
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Hi Ravi,
That information you provided was very useful, thanks!
Regards,
Pallav
On Tuesday, February 9, 2016 2:51 PM, Pallav Bose <pallav_bose@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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Subject: [Bug 207087] kernel: r295285 in 10.2-STABLE breaks OpenVPN
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Date: Fri, 12 Feb 2016 21:02:09 +0000
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Created attachment 166908
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