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It is useful to be able to write to the pcap's file descriptor.  This
is used by some Ethernet simulators (like the experimenal Ethernet
simulator for the SIMH VAX simulator) which run on many operating systems
(and thus use the pcap interface to hide most of the OS-specific stuff).

The attached patch to libpcap causes it to open the BPF descriptors for
reading and writing.  Any objections?

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>

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Index: pcap-bpf.c
===================================================================
RCS file: /cvsroot/basesrc/lib/libpcap/pcap-bpf.c,v
retrieving revision 1.8
diff -c -r1.8 pcap-bpf.c
*** pcap-bpf.c	2002/09/22 16:13:01	1.8
--- pcap-bpf.c	2002/10/19 02:00:36
***************
*** 152,158 ****
  	 */
  	do {
  		(void)snprintf(device, sizeof device, "/dev/bpf%d", n++);
! 		fd = open(device, O_RDONLY);
  	} while (fd < 0 && errno == EBUSY);
  
  	/*
--- 152,158 ----
  	 */
  	do {
  		(void)snprintf(device, sizeof device, "/dev/bpf%d", n++);
! 		fd = open(device, O_RDWR);
  	} while (fd < 0 && errno == EBUSY);
  
  	/*

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