I want to test the flags being returned by the IOCTL call to the socket.
I've written a minimal C program to do that. You can either compile the
attached source or, if you'd prefer, I can provide a binary. Try it on
all your network interfaces.
gcc -o socket-flags socket-flags.c
for dev in /sys/class/net/*; do ./socket-flags ${dev##*/}; done
eth0 SIOCGIFFLAGS 0x1043 ( IFF_UP (0x1) IFF_BROADCAST (0x2) IFF_RUNNING (0x40)
IFF_MULTICAST (0x1000))
lo SIOCGIFFLAGS 0x49 ( IFF_UP (0x1) IFF_LOOPBACK (0x8) IFF_RUNNING (0x40))
pan0 SIOCGIFFLAGS 0x1002 ( IFF_BROADCAST (0x2) IFF_MULTICAST (0x1000))
tun0 SIOCGIFFLAGS 0x10d1 ( IFF_UP (0x1) IFF_POINTTOPOINT (0x10) IFF_RUNNING
(0x40) IFF_NOARP (0x80) IFF_MULTICAST (0x1000))
wlan0 SIOCGIFFLAGS 0x1043 ( IFF_UP (0x1) IFF_BROADCAST (0x2) IFF_RUNNING (0x40)
IFF_MULTICAST (0x1000))
wmaster0 SIOCGIFFLAGS 0x1043 ( IFF_UP (0x1) IFF_BROADCAST (0x2) IFF_RUNNING
(0x40) IFF_MULTICAST (0x1000))
What we are looking for is the IFF_RUNNING flag defined in
/usr/include/net/if.h:
IFF_RUNNING = 0x40, /* Resources allocated. */
** Attachment added: "socket-flags.c source-code"
http://launchpadlibrarian.net/23953477/socket-flags.c
--
netspeed applet will not measure wired
https://bugs.launchpad.net/bugs/335507
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