le man page on OSF1

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le(7)									 le(7)

NAME
       le - LeMAC Ethernet interface

SYNOPSIS
       config_driver le

DESCRIPTION
       The  le interface provides access to a 10 Mb/s Ethernet network through
       the LeMAC controller.

       The host's Internet address is specified at boot time with  an  SIOCSI‐
       FADDR  ioctl.  The le interface employs the address resolution protocol
       described in arp(7) to map dynamically between  Internet	 and  Ethernet
       addresses on the local network.

       The  SIOCSPHYSADDR  ioctl can be used to change the physical address of
       the LeMAC.  The SIOCRPHYSADDR ioctl can be used to  read	 the  physical
       address of the LeMAC.

       The  SIOCADDMULTI  and SIOCDELMULTI ioctls can be used to add or delete
       multicast addresses. The LeMAC recognizes a  maximum  of	 12  multicast
       addresses.

       The SIOCRDCTRS and SIOCRDZCTRS ioctls can be used to read or ``read and
       clear'' the Ethernet driver counters. The argument to these two	ioctls
       is a pointer to a counter structure, ctrreq, found in <net/if.h>.

       The  SIOCENABLBACK  and SIOCDISABLBACK ioctls can be used to enable and
       disable the interface loopback mode respectively.

ERRORS
       The diagnostic error messages contain relevant information provided  by
       the LeMAC.  The interface was handed a message with addresses formatted
       in an unsuitable address family, and the packet was  dropped.   The  le
       driver was unable to allocate memory for internal data structures.  The
       IRQ for the LeMAC is missing from the CMOS  configuration  data	or  is
       incorrect.   The	 IRQ for the LeMAC is missing from the CMOS configura‐
       tion data or is incorrect.  Too many multicast requests have been made.
       The  shared  memory  block  for the LeMAC's local RAM buffer is missing
       from the CMOS configuration data.  The  station	address	 PROM  on  the
       LeMAC is corrupt or inaccessible.  The hardware transmit queue has been
       overflowed.  An attempt was  made  to  delete  the  Ethernet  broadcast
       address of ff-ff-ff-ff-ff.

EXAMPLES
       To  obtain  the	physical address of the adapter, use the SIOCRPHYSADDR
       ioctl as in the following program example:

       #include <stdio.h>	       /* standard I/O */  #include  <errno.h>
       /*  error  numbers */ #include <sys/socket.h>	     /* socket defini‐
       tions  */  #include  <sys/ioctl.h>	    /*	ioctls	 */   #include
       <net/if.h>	      /* generic interface structures */

       main() {
	 int s,i;
	 struct	 ifdevea  devea;
	 /* Get a socket */
	 s = socket(AF_INET,SOCK_DGRAM,0);
	 if (s < 0) {
	    perror("socket");
	    exit(1);
	 }
	 strcpy(devea.ifr_name,"le0");
	 if (ioctl(s,SIOCRPHYSADDR,&devea) < 0) {
	    perror(&devea.ifr_name[0]);
	    exit(1);
	 }
	 printf("Address is ");
	 for (i = 0; i < 6; i++)
	    printf("%X ", devea.default_pa[i] & 0xff);
	 printf("\n");
	 close(s); }

       To  enable  external  loopback,	use the SIOCENABLEBACK ioctl as in the
       following program example:

       #include <stdio.h>	       /* standard I/O */  #include  <errno.h>
       /*  error  numbers */ #include <sys/socket.h>	     /* socket defini‐
       tions  */  #include  <sys/ioctl.h>	    /*	ioctls	 */   #include
       <net/if.h>	      /* generic interface structures */

       main() {
	 int s;
	 struct	 ifreq	data;
	 /* Get a socket */
	 s = socket(AF_INET,SOCK_DGRAM,0);
	 if (s < 0) {
	    perror("socket");
	    exit(1);
	 }
	 strcpy(data.ifr,"le0");
	 if (ioctl(s,SIOCENABLEBACK,&data) < 0) {
	    perror("SIOCENABLEBACK:");
	    exit(1);
	 }
	 close(s); }

SEE ALSO
       arp(7), inet(7), netintro(7)

									 le(7)
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