Resolve an IP address to a hardware address if not found,initiate query and return NULL. If an address is returned, the interface driver may send the packet if NULL is returned,res_arp() will have saved the packet on its pending queue,so no further action (like freeing the packet) is necessary.

TCP_IP源码
..........\ahdlc.c
..........\ahdlc.h
..........\alloc.c
..........\arcdump.c
..........\arcnet.c
..........\arcnet.h
..........\arp.c
..........\arp.h
..........\arp.h.bak
..........\arpcmd.c
..........\arpdump.c
..........\arphdr.c
..........\ARP协议说明.c
..........\ARP协议说明.txt
..........\asmgloba.h
..........\asy.c
..........\asy.h
..........\asyvec.s
..........\aud.c
..........\audit.c
..........\ax25.c
..........\ax25.h
..........\ax25cmd.c
..........\ax25dump.c
..........\ax25hdr.c
..........\ax25mail.c
..........\ax25mail.h
..........\ax25subr.c
..........\ax25user.c
..........\axheard.c
..........\axsock.c
..........\bm.h
..........\bmutil.c
..........\bootp.c
..........\bootp.h
..........\bootpcmd.c
..........\bootpd.c
..........\bootpd.h
..........\bootpdip.c
..........\cmdparse.c
..........\cmdparse.h
..........\commands.h
..........\config.c
..........\config.h
..........\conv.h
..........\crc.c
..........\crc.h
..........\daemon.h
..........\devparam.c
..........\devparam.h
..........\dialer.c
..........\dialer.h
..........\dirutil.c
..........\dirutil.h
..........\display.c
..........\display.h
..........\dma.c
..........\dma.h
..........\domain.c
..........\domain.h
..........\domhdr.c
..........\dos.c
..........\drsi.c
..........\drsi.h
..........\drsivec.s
..........\eagle.c
..........\eagle.h
..........\eaglevec.s
..........\enet.c
..........\enet.h
..........\enetdump.c
..........\files.c
..........\files.h
..........\finger.c
..........\fingerd.c
..........\forward.c
..........\ftp.h
..........\ftpcli.c
..........\ftpcli.h
..........\ftpserv.c
..........\ftpserv.h
..........\ftpsubr.c
..........\genparm.c
..........\getopt.c
..........\global.h
..........\hapn.c
..........\hapn.h
..........\hapnvec.s
..........\hardware.h
..........\hop.c
..........\hs.c
..........\hs.h
..........\hsvec.s
..........\icmp.c
..........\icmp.h
..........\icmpcmd.c
..........\icmpdump.c
..........\icmphdr.c
..........\icmpmsg.c

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