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Length: 1652 (0x674)
Types: TextFile
Notes: UNIX file
Names: »tcp.h«
└─⟦8c4f54e61⟧ Bits:30004068/disk2.imd Interactive TCP/IP v.1.2
└─⟦8c4f54e61⟧ UNIX Filesystem
└─⟦this⟧ »hb/new/usr/include/netinet/tcp.h«
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)tcp.h 2.1 - 89/04/21
*/
#ifndef _h_TCP
#define _h_TCP
#ident "@(#)tcp.h 2.1 - 89/04/21"
typedef u_long tcp_seq;
/*
* TCP header.
* Per RFC 793, September, 1981.
*/
struct tcphdr {
u_short th_sport; /* source port */
u_short th_dport; /* destination port */
tcp_seq th_seq; /* sequence number */
tcp_seq th_ack; /* acknowledgement number */
#if defined(vax) || defined(i386)
u_char th_x2:4, /* (unused) */
th_off:4; /* data offset */
#else
u_char th_off:4, /* data offset */
th_x2:4; /* (unused) */
#endif
u_char th_flags;
#define TH_FIN 0x01
#define TH_SYN 0x02
#define TH_RST 0x04
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
u_short th_win; /* window */
u_short th_sum; /* checksum */
u_short th_urp; /* urgent pointer */
};
#define TCPOPT_EOL 0
#define TCPOPT_NOP 1
#define TCPOPT_MAXSEG 2
/*
* Default maximum segment size for TCP.
* With an IP MSS of 576, this is 536,
* but 512 is probably more convenient.
*/
#ifdef lint
#define TCP_MSS 536
#else
#define TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))
#endif
/*
* User-settable options (used with setsockopt).
*/
#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
#define TCP_MAXSEG 0x02 /* set maximum segment size */
#define TCP_OOBMODE 0x04 /* specify non-standard OOB processing */
/* use values TCPOOB_RFCFORM and TCPOOB_SEGMENT */
/* from tcp_var.h to use (can be or'd) */
#endif /* _h_TCP */