1 /* socketvar.h 4.16 82/04/10 */ 2 3 /* 4 * Kernel structure per socket. 5 * Contains send and receive buffer queues, 6 * handle on protocol and pointer to protocol 7 * private data and error information. 8 */ 9 struct socket { 10 short so_type; /* generic type, see socket.h */ 11 short so_options; /* from socket call, see socket.h */ 12 short so_linger; /* time to linger while closing */ 13 short so_state; /* internal state flags SS_*, below */ 14 caddr_t so_pcb; /* protocol control block */ 15 struct protosw *so_proto; /* protocol handle */ 16 struct sockbuf { 17 short sb_cc; /* actual chars in buffer */ 18 short sb_hiwat; /* max actual char count */ 19 short sb_mbcnt; /* chars of mbufs used */ 20 short sb_mbmax; /* max chars of mbufs to use */ 21 short sb_lowat; /* low water mark (not used yet) */ 22 short sb_timeo; /* timeout (not used yet) */ 23 struct mbuf *sb_mb; /* the mbuf chain */ 24 struct proc *sb_sel; /* process selecting read/write */ 25 short sb_flags; /* flags, see below */ 26 } so_rcv, so_snd; 27 #define SB_LOCK 0x01 /* lock on data queue (so_rcv only) */ 28 #define SB_WANT 0x02 /* someone is waiting to lock */ 29 #define SB_WAIT 0x04 /* someone is waiting for data/space */ 30 #define SB_SEL 0x08 /* buffer is selected */ 31 #define SB_COLL 0x10 /* collision selecting */ 32 short so_timeo; /* connection timeout */ 33 u_short so_error; /* error affecting connection */ 34 short so_oobmark; /* chars to oob mark */ 35 short so_pgrp; /* pgrp for signals */ 36 }; 37 38 /* 39 * Socket state bits. 40 */ 41 #define SS_USERGONE 0x001 /* no file table ref any more */ 42 #define SS_ISCONNECTED 0x002 /* socket connected to a peer */ 43 #define SS_ISCONNECTING 0x004 /* in process of connecting to peer */ 44 #define SS_ISDISCONNECTING 0x008 /* in process of disconnecting */ 45 #define SS_CANTSENDMORE 0x010 /* can't send more data to peer */ 46 #define SS_CANTRCVMORE 0x020 /* can't receive more data from peer */ 47 #define SS_CONNAWAITING 0x040 /* connections awaiting acceptance */ 48 #define SS_RCVATMARK 0x080 /* at mark on input */ 49 50 #define SS_PRIV 0x100 /* privileged for broadcast, raw... */ 51 #define SS_NBIO 0x200 /* non-blocking ops */ 52 #define SS_ASYNC 0x400 /* async i/o notify */ 53 54 /* 55 * Macros for sockets and socket buffering. 56 */ 57 58 /* how much space is there in a socket buffer (so->so_snd or so->so_rcv) */ 59 #define sbspace(sb) \ 60 (MIN((sb)->sb_hiwat-(sb)->sb_cc, ((sb)->sb_mbmax-(sb)->sb_mbcnt))) 61 62 /* do we have to send all at once on a socket? */ 63 #define sosendallatonce(so) \ 64 (((so)->so_state & SS_NBIO) || ((so)->so_proto->pr_flags & PR_ATOMIC)) 65 66 /* can we read something from so? */ 67 #define soreadable(so) \ 68 ((so)->so_rcv.sb_cc || ((so)->so_state & (SS_CANTRCVMORE|SS_CONNAWAITING))) 69 70 /* can we write something to so? */ 71 #define sowriteable(so) \ 72 (sbspace(&(so)->so_snd) > 0 && \ 73 (((so)->so_state&SS_ISCONNECTED) || \ 74 ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0) || \ 75 ((so)->so_state & SS_CANTSENDMORE)) 76 77 /* adjust counters in sb reflecting allocation of m */ 78 #define sballoc(sb, m) { \ 79 (sb)->sb_cc += (m)->m_len; \ 80 (sb)->sb_mbcnt += MSIZE; \ 81 if ((m)->m_off > MMAXOFF) \ 82 (sb)->sb_mbcnt += CLBYTES; \ 83 } 84 85 /* adjust counters in sb reflecting freeing of m */ 86 #define sbfree(sb, m) { \ 87 (sb)->sb_cc -= (m)->m_len; \ 88 (sb)->sb_mbcnt -= MSIZE; \ 89 if ((m)->m_off > MMAXOFF) \ 90 (sb)->sb_mbcnt -= CLBYTES; \ 91 } 92 93 /* set lock on sockbuf sb */ 94 #define sblock(sb) { \ 95 while ((sb)->sb_flags & SB_LOCK) { \ 96 (sb)->sb_flags |= SB_WANT; \ 97 sleep((caddr_t)&(sb)->sb_flags, PZERO+1); \ 98 } \ 99 (sb)->sb_flags |= SB_LOCK; \ 100 } 101 102 /* release lock on sockbuf sb */ 103 #define sbunlock(sb) { \ 104 (sb)->sb_flags &= ~SB_LOCK; \ 105 if ((sb)->sb_flags & SB_WANT) { \ 106 (sb)->sb_flags &= ~SB_WANT; \ 107 wakeup((caddr_t)&(sb)->sb_flags); \ 108 } \ 109 } 110 111 #define sorwakeup(so) sbwakeup(&(so)->so_rcv) 112 #define sowwakeup(so) sbwakeup(&(so)->so_snd) 113