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Table 12–1: Network ioctl Commands (cont.)
ioctl Command
Required Description For More Information
SIOCSIFFLAGS
Yes Ensures that the
interface is operating
correctly according
to the interface flags
(if_flags).
Section 12.12
SIOCSIPMTU
Yes Sets the IP maximum
transmission unit
(MTU).
Section 12.13
SIOCSMACSPEED
Yes Sets the media speed. Section 12.14
SIOCIFRESET
No Resets the device. Section 12.15
SIOCIFSETCHAR
Yes Sets network device
characteristics, such
as full duplex or
promiscuous mode.
Section 12.16
12.1 Setting Up the el_ioctl Routine
The following code shows how to set up the el_ioctl( ) routine:
static int el_ioctl(struct ifnet *ifp, 1
u_int cmd, 2
caddr_t data) 3
{
register struct el_softc *sc = el_softc[ifp->if_unit];
4
register unit = ifp->if_unit; 5
struct ifreq *ifr = (struct ifreq *)data; 6
struct ifdevea *ifd = (struct ifdevea *)data; 7
struct ctrreq *ctr = (struct ctrreq *)data; 8
struct ifchar *ifc = (struct ifchar *)data; 9
int s, i, j, need_reset, lock_on = 1, status = ESUCCESS; 10
unsigned short ifmtu, speed; 11
u_char mclist_buf[NET_SZ_MCLIST]; 12
1 Specifies a pointer to the ifnet data structure for an if_el device.
2 Specifies the ioctl command.
3 Specifies a pointer to ioctl command-specific data to be passed to
or initialized by the device driver.
4 Declares a pointer to the el_softc data structure that is called sc and
initializes it to the el_softc data structure for this device.
5 Declares a unit variable and initializes it to the unit number for the
device.
6 Casts the data argument to a data structure of type ifreq for use with
the SIOCPHYSADDR, SIOCADDMULTI, SIOCDELMULTI, SIOCSIPMTU, and
SIOCSMACSPEED ioctl commands.
12–2 Implementing the ioctl Section