1177867Sjfv/* 2169240Sjfv * ng_tty.c 3190872Sjfv */ 4169240Sjfv 5169240Sjfv/*- 6169240Sjfv * Copyright (c) 1996-1999 Whistle Communications, Inc. 7169240Sjfv * All rights reserved. 8169240Sjfv * 9169240Sjfv * Subject to the following obligations and disclaimer of warranty, use and 10169240Sjfv * redistribution of this software, in source or object code forms, with or 11169240Sjfv * without modifications are expressly permitted by Whistle Communications; 12169240Sjfv * provided, however, that: 13169240Sjfv * 1. Any and all reproductions of the source or object code must include the 14169240Sjfv * copyright notice above and the following disclaimer of warranties; and 15169240Sjfv * 2. No rights are granted, in any manner or form, to use Whistle 16169240Sjfv * Communications, Inc. trademarks, including the mark "WHISTLE 17169240Sjfv * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18169240Sjfv * such appears in the above copyright notice or in the software. 19169240Sjfv * 20169240Sjfv * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21169240Sjfv * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22169240Sjfv * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23169240Sjfv * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24169240Sjfv * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25169240Sjfv * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26169240Sjfv * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27169240Sjfv * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28169240Sjfv * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29169240Sjfv * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30169240Sjfv * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31169240Sjfv * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32177867Sjfv * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33177867Sjfv * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34169240Sjfv * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35185353Sjfv * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36185353Sjfv * OF SUCH DAMAGE. 37185353Sjfv * 38185353Sjfv * Author: Archie Cobbs <archie@freebsd.org> 39185353Sjfv * 40185353Sjfv * Updated by Andrew Thompson <thompsa@FreeBSD.org> for MPSAFE TTY. 41185353Sjfv * 42169240Sjfv * $FreeBSD$ 43169240Sjfv * $Whistle: ng_tty.c,v 1.21 1999/11/01 09:24:52 julian Exp $ 44169589Sjfv */ 45169240Sjfv 46177867Sjfv/* 47177867Sjfv * This file implements TTY hooks to link in to the netgraph system. The node 48177867Sjfv * is created and then passed the callers opened TTY file descriptor number to 49177867Sjfv * NGM_TTY_SET_TTY, this will hook the tty via ttyhook_register(). 50177867Sjfv * 51177867Sjfv * Incoming data is delivered directly to ng_tty via the TTY bypass hook as a 52169240Sjfv * buffer pointer and length, this is converted to a mbuf and passed to the 53177867Sjfv * peer. 54177867Sjfv * 55177867Sjfv * If the TTY device does not support bypass then incoming characters are 56177867Sjfv * delivered to the hook one at a time, each in its own mbuf. You may 57177867Sjfv * optionally define a ``hotchar,'' which causes incoming characters to be 58173788Sjfv * buffered up until either the hotchar is seen or the mbuf is full (MHLEN 59177867Sjfv * bytes). Then all buffered characters are immediately delivered. 60177867Sjfv */ 61177867Sjfv 62169240Sjfv#include <sys/param.h> 63173788Sjfv#include <sys/systm.h> 64169240Sjfv#include <sys/conf.h> 65177867Sjfv#include <sys/errno.h> 66169240Sjfv#include <sys/fcntl.h> 67173788Sjfv#include <sys/ioccom.h> 68169240Sjfv#include <sys/kernel.h> 69169240Sjfv#include <sys/malloc.h> 70169240Sjfv#include <sys/mbuf.h> 71169240Sjfv#include <sys/priv.h> 72169240Sjfv#include <sys/socket.h> 73169240Sjfv#include <sys/syslog.h> 74169240Sjfv#include <sys/tty.h> 75169240Sjfv#include <sys/ttycom.h> 76169240Sjfv#include <sys/proc.h> 77169240Sjfv 78169240Sjfv#include <net/if.h> 79169240Sjfv#include <net/if_var.h> 80169240Sjfv 81169240Sjfv#include <netgraph/ng_message.h> 82169589Sjfv#include <netgraph/netgraph.h> 83169240Sjfv#include <netgraph/ng_tty.h> 84177867Sjfv 85169240Sjfv/* Per-node private info */ 86169240Sjfvstruct ngt_softc { 87169240Sjfv struct tty *tp; /* Terminal device */ 88169240Sjfv node_p node; /* Netgraph node */ 89169240Sjfv hook_p hook; /* Netgraph hook */ 90169240Sjfv struct ifqueue outq; /* Queue of outgoing data */ 91177867Sjfv size_t outqlen; /* Number of bytes in outq */ 92177867Sjfv struct mbuf *m; /* Incoming non-bypass data buffer */ 93177867Sjfv short hotchar; /* Hotchar, or -1 if none */ 94177867Sjfv u_int flags; /* Flags */ 95169240Sjfv}; 96169240Sjfvtypedef struct ngt_softc *sc_p; 97177867Sjfv 98177867Sjfv/* Flags */ 99177867Sjfv#define FLG_DEBUG 0x0002 100177867Sjfv 101177867Sjfv/* Netgraph methods */ 102177867Sjfvstatic ng_constructor_t ngt_constructor; 103177867Sjfvstatic ng_rcvmsg_t ngt_rcvmsg; 104177867Sjfvstatic ng_shutdown_t ngt_shutdown; 105177867Sjfvstatic ng_newhook_t ngt_newhook; 106177867Sjfvstatic ng_connect_t ngt_connect; 107177867Sjfvstatic ng_rcvdata_t ngt_rcvdata; 108169240Sjfvstatic ng_disconnect_t ngt_disconnect; 109169240Sjfv 110169240Sjfv#define ERROUT(x) do { error = (x); goto done; } while (0) 111169240Sjfv 112169240Sjfvstatic th_getc_inject_t ngt_getc_inject; 113169240Sjfvstatic th_getc_poll_t ngt_getc_poll; 114169240Sjfvstatic th_rint_t ngt_rint; 115169240Sjfvstatic th_rint_bypass_t ngt_rint_bypass; 116169240Sjfvstatic th_rint_poll_t ngt_rint_poll; 117169240Sjfv 118169240Sjfvstatic struct ttyhook ngt_hook = { 119169240Sjfv .th_getc_inject = ngt_getc_inject, 120169240Sjfv .th_getc_poll = ngt_getc_poll, 121169240Sjfv .th_rint = ngt_rint, 122169240Sjfv .th_rint_bypass = ngt_rint_bypass, 123169240Sjfv .th_rint_poll = ngt_rint_poll, 124169240Sjfv}; 125169589Sjfv 126169240Sjfv/* Netgraph node type descriptor */ 127177867Sjfvstatic struct ng_type typestruct = { 128169240Sjfv .version = NG_ABI_VERSION, 129169240Sjfv .name = NG_TTY_NODE_TYPE, 130169240Sjfv .constructor = ngt_constructor, 131169240Sjfv .rcvmsg = ngt_rcvmsg, 132169240Sjfv .shutdown = ngt_shutdown, 133169240Sjfv .newhook = ngt_newhook, 134169240Sjfv .connect = ngt_connect, 135169240Sjfv .rcvdata = ngt_rcvdata, 136169240Sjfv .disconnect = ngt_disconnect, 137169240Sjfv}; 138169240SjfvNETGRAPH_INIT(tty, &typestruct); 139169240Sjfv 140169240Sjfv#define NGTLOCK(sc) IF_LOCK(&sc->outq) 141169240Sjfv#define NGTUNLOCK(sc) IF_UNLOCK(&sc->outq) 142169240Sjfv 143169240Sjfv/****************************************************************** 144169240Sjfv NETGRAPH NODE METHODS 145169240Sjfv******************************************************************/ 146169240Sjfv 147169240Sjfv/* 148169240Sjfv * Initialize a new node of this type. 149169240Sjfv * 150169240Sjfv * We only allow nodes to be created as a result of setting 151169240Sjfv * the line discipline on a tty, so always return an error if not. 152169240Sjfv */ 153169240Sjfvstatic int 154169240Sjfvngt_constructor(node_p node) 155169240Sjfv{ 156169240Sjfv sc_p sc; 157169240Sjfv 158169240Sjfv /* Allocate private structure */ 159169240Sjfv sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO); 160169240Sjfv 161169240Sjfv NG_NODE_SET_PRIVATE(node, sc); 162169240Sjfv sc->node = node; 163169240Sjfv 164169240Sjfv mtx_init(&sc->outq.ifq_mtx, "ng_tty node+queue", NULL, MTX_DEF); 165169240Sjfv IFQ_SET_MAXLEN(&sc->outq, ifqmaxlen); 166169240Sjfv 167169240Sjfv return (0); 168169240Sjfv} 169177867Sjfv 170177867Sjfv/* 171177867Sjfv * Add a new hook. There can only be one. 172177867Sjfv */ 173177867Sjfvstatic int 174177867Sjfvngt_newhook(node_p node, hook_p hook, const char *name) 175177867Sjfv{ 176169240Sjfv const sc_p sc = NG_NODE_PRIVATE(node); 177173788Sjfv 178173788Sjfv if (strcmp(name, NG_TTY_HOOK)) 179169240Sjfv return (EINVAL); 180169240Sjfv 181169240Sjfv if (sc->hook) 182169240Sjfv return (EISCONN); 183169240Sjfv 184177867Sjfv NGTLOCK(sc); 185169240Sjfv sc->hook = hook; 186169240Sjfv NGTUNLOCK(sc); 187169240Sjfv 188173788Sjfv return (0); 189173788Sjfv} 190169240Sjfv 191169240Sjfv/* 192169240Sjfv * Set the hook into queueing mode (for outgoing packets), 193169240Sjfv * so that we wont deliver mbuf thru the whole graph holding 194169240Sjfv * tty locks. 195169240Sjfv */ 196169240Sjfvstatic int 197169240Sjfvngt_connect(hook_p hook) 198169240Sjfv{ 199169240Sjfv NG_HOOK_FORCE_QUEUE(hook); 200169240Sjfv return (0); 201169240Sjfv} 202169240Sjfv 203169240Sjfv/* 204169240Sjfv * Disconnect the hook 205169240Sjfv */ 206177867Sjfvstatic int 207177867Sjfvngt_disconnect(hook_p hook) 208177867Sjfv{ 209177867Sjfv const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 210177867Sjfv 211177867Sjfv if (hook != sc->hook) 212177867Sjfv panic("%s", __func__); 213169240Sjfv 214169240Sjfv NGTLOCK(sc); 215169240Sjfv sc->hook = NULL; 216169240Sjfv NGTUNLOCK(sc); 217169240Sjfv 218169240Sjfv return (0); 219169240Sjfv} 220169240Sjfv 221169589Sjfv/* 222169240Sjfv * Remove this node. The does the netgraph portion of the shutdown. 223177867Sjfv */ 224169240Sjfvstatic int 225169240Sjfvngt_shutdown(node_p node) 226169240Sjfv{ 227169240Sjfv const sc_p sc = NG_NODE_PRIVATE(node); 228169240Sjfv struct tty *tp; 229169240Sjfv 230173788Sjfv tp = sc->tp; 231169240Sjfv if (tp != NULL) { 232169240Sjfv tty_lock(tp); 233169240Sjfv ttyhook_unregister(tp); 234169240Sjfv } 235169240Sjfv /* Free resources */ 236169240Sjfv IF_DRAIN(&sc->outq); 237169240Sjfv mtx_destroy(&(sc)->outq.ifq_mtx); 238169240Sjfv NG_NODE_UNREF(sc->node); 239169240Sjfv free(sc, M_NETGRAPH); 240169240Sjfv 241177867Sjfv return (0); 242185353Sjfv} 243185353Sjfv 244169240Sjfv/* 245177867Sjfv * Receive control message 246169240Sjfv */ 247177867Sjfvstatic int 248169240Sjfvngt_rcvmsg(node_p node, item_p item, hook_p lasthook) 249177867Sjfv{ 250169240Sjfv struct proc *p; 251177867Sjfv const sc_p sc = NG_NODE_PRIVATE(node); 252169240Sjfv struct ng_mesg *msg, *resp = NULL; 253177867Sjfv int error = 0; 254169240Sjfv 255177867Sjfv NGI_GET_MSG(item, msg); 256169240Sjfv switch (msg->header.typecookie) { 257177867Sjfv case NGM_TTY_COOKIE: 258169240Sjfv switch (msg->header.cmd) { 259177867Sjfv case NGM_TTY_SET_TTY: 260169240Sjfv if (sc->tp != NULL) 261177867Sjfv return (EBUSY); 262169240Sjfv 263177867Sjfv p = pfind(((int *)msg->data)[0]); 264190872Sjfv if (p == NULL || (p->p_flag & P_WEXIT)) 265190872Sjfv return (ESRCH); 266169240Sjfv _PHOLD(p); 267177867Sjfv PROC_UNLOCK(p); 268169240Sjfv error = ttyhook_register(&sc->tp, p, ((int *)msg->data)[1], 269177867Sjfv &ngt_hook, sc); 270169240Sjfv PRELE(p); 271177867Sjfv if (error != 0) 272177867Sjfv return (error); 273169240Sjfv break; 274177867Sjfv case NGM_TTY_SET_HOTCHAR: 275169240Sjfv { 276185353Sjfv int hotchar; 277169240Sjfv 278169240Sjfv if (msg->header.arglen != sizeof(int)) 279169240Sjfv ERROUT(EINVAL); 280169240Sjfv hotchar = *((int *) msg->data); 281169589Sjfv if (hotchar != (u_char) hotchar && hotchar != -1) 282169240Sjfv ERROUT(EINVAL); 283185353Sjfv sc->hotchar = hotchar; /* race condition is OK */ 284169240Sjfv break; 285173788Sjfv } 286169240Sjfv case NGM_TTY_GET_HOTCHAR: 287169240Sjfv NG_MKRESPONSE(resp, msg, sizeof(int), M_NOWAIT); 288169240Sjfv if (!resp) 289177867Sjfv ERROUT(ENOMEM); 290177867Sjfv /* Race condition here is OK */ 291177867Sjfv *((int *) resp->data) = sc->hotchar; 292169240Sjfv break; 293169240Sjfv default: 294169240Sjfv ERROUT(EINVAL); 295169240Sjfv } 296169589Sjfv break; 297169240Sjfv default: 298185353Sjfv ERROUT(EINVAL); 299169240Sjfv } 300177867Sjfvdone: 301169240Sjfv NG_RESPOND_MSG(error, node, item, resp); 302169240Sjfv NG_FREE_MSG(msg); 303169240Sjfv return (error); 304169240Sjfv} 305169240Sjfv 306169240Sjfv/* 307169240Sjfv * Receive incoming data from netgraph system. Put it on our 308169240Sjfv * output queue and start output if necessary. 309169240Sjfv */ 310169240Sjfvstatic int 311169240Sjfvngt_rcvdata(hook_p hook, item_p item) 312169240Sjfv{ 313173788Sjfv const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 314173788Sjfv struct tty *tp = sc->tp; 315169240Sjfv struct mbuf *m; 316169240Sjfv 317169240Sjfv if (hook != sc->hook) 318169240Sjfv panic("%s", __func__); 319169240Sjfv 320169240Sjfv NGI_GET_M(item, m); 321169240Sjfv NG_FREE_ITEM(item); 322169240Sjfv 323169240Sjfv if (tp == NULL) { 324169240Sjfv NG_FREE_M(m); 325169240Sjfv return (ENXIO); 326169240Sjfv } 327169240Sjfv 328169240Sjfv IF_LOCK(&sc->outq); 329169240Sjfv if (_IF_QFULL(&sc->outq)) { 330169240Sjfv _IF_DROP(&sc->outq); 331173788Sjfv IF_UNLOCK(&sc->outq); 332173788Sjfv NG_FREE_M(m); 333169240Sjfv return (ENOBUFS); 334169240Sjfv } 335169240Sjfv 336169240Sjfv _IF_ENQUEUE(&sc->outq, m); 337169240Sjfv sc->outqlen += m->m_pkthdr.len; 338169240Sjfv IF_UNLOCK(&sc->outq); 339169240Sjfv 340169240Sjfv /* notify the TTY that data is ready */ 341169240Sjfv tty_lock(tp); 342169240Sjfv if (!tty_gone(tp)) 343169240Sjfv ttydevsw_outwakeup(tp); 344169240Sjfv tty_unlock(tp); 345169240Sjfv 346169240Sjfv return (0); 347169240Sjfv} 348169240Sjfv 349169240Sjfvstatic size_t 350169240Sjfvngt_getc_inject(struct tty *tp, void *buf, size_t len) 351169240Sjfv{ 352169240Sjfv sc_p sc = ttyhook_softc(tp); 353169240Sjfv size_t total = 0; 354169240Sjfv int length; 355169240Sjfv 356169240Sjfv while (len) { 357169240Sjfv struct mbuf *m; 358169240Sjfv 359169240Sjfv /* Remove first mbuf from queue */ 360169240Sjfv IF_DEQUEUE(&sc->outq, m); 361169240Sjfv if (m == NULL) 362169240Sjfv break; 363169240Sjfv 364169240Sjfv /* Send as much of it as possible */ 365169240Sjfv while (m != NULL) { 366169240Sjfv length = min(m->m_len, len); 367169240Sjfv memcpy((char *)buf + total, mtod(m, char *), length); 368169240Sjfv 369169240Sjfv m->m_data += length; 370169240Sjfv m->m_len -= length; 371169240Sjfv total += length; 372169240Sjfv len -= length; 373169589Sjfv 374169240Sjfv if (m->m_len > 0) 375185353Sjfv break; /* device can't take any more */ 376169240Sjfv m = m_free(m); 377177867Sjfv } 378169240Sjfv 379169240Sjfv /* Put remainder of mbuf chain (if any) back on queue */ 380169240Sjfv if (m != NULL) { 381169240Sjfv IF_PREPEND(&sc->outq, m); 382169240Sjfv break; 383169240Sjfv } 384169240Sjfv } 385169240Sjfv IF_LOCK(&sc->outq); 386190872Sjfv sc->outqlen -= total; 387169240Sjfv IF_UNLOCK(&sc->outq); 388169240Sjfv MPASS(sc->outqlen >= 0); 389173788Sjfv 390169240Sjfv return (total); 391169240Sjfv} 392169240Sjfv 393169240Sjfvstatic size_t 394177867Sjfvngt_getc_poll(struct tty *tp) 395169240Sjfv{ 396169240Sjfv sc_p sc = ttyhook_softc(tp); 397169240Sjfv 398169240Sjfv return (sc->outqlen); 399169240Sjfv} 400169240Sjfv 401169240Sjfv/* 402169240Sjfv * Optimised TTY input. 403173788Sjfv * 404173788Sjfv * We get a buffer pointer to hopefully a complete data frame. Do not check for 405169240Sjfv * the hotchar, just pass it on. 406169240Sjfv */ 407169240Sjfvstatic size_t 408169240Sjfvngt_rint_bypass(struct tty *tp, const void *buf, size_t len) 409169240Sjfv{ 410169240Sjfv sc_p sc = ttyhook_softc(tp); 411169240Sjfv node_p node = sc->node; 412169240Sjfv struct mbuf *m, *mb; 413177867Sjfv size_t total = 0; 414169240Sjfv int error = 0, length; 415173788Sjfv 416169240Sjfv tty_lock_assert(tp, MA_OWNED); 417169240Sjfv 418173788Sjfv if (sc->hook == NULL) 419169240Sjfv return (0); 420173788Sjfv 421173788Sjfv m = m_getm2(NULL, len, M_NOWAIT, MT_DATA, M_PKTHDR); 422169240Sjfv if (m == NULL) { 423169240Sjfv if (sc->flags & FLG_DEBUG) 424169240Sjfv log(LOG_ERR, 425169240Sjfv "%s: can't get mbuf\n", NG_NODE_NAME(node)); 426169240Sjfv return (0); 427169240Sjfv } 428169240Sjfv m->m_pkthdr.rcvif = NULL; 429169240Sjfv 430169240Sjfv for (mb = m; mb != NULL; mb = mb->m_next) { 431169240Sjfv length = min(M_TRAILINGSPACE(mb), len - total); 432169240Sjfv 433169589Sjfv memcpy(mtod(m, char *), (const char *)buf + total, length); 434169589Sjfv mb->m_len = length; 435169589Sjfv total += length; 436169240Sjfv m->m_pkthdr.len += length; 437169240Sjfv } 438169240Sjfv if (sc->m != NULL) { 439177867Sjfv /* 440173788Sjfv * Odd, we have changed from non-bypass to bypass. It is 441169240Sjfv * unlikely but not impossible, flush the data first. 442169240Sjfv */ 443169240Sjfv sc->m->m_data = sc->m->m_pktdat; 444169240Sjfv NG_SEND_DATA_ONLY(error, sc->hook, sc->m); 445169240Sjfv sc->m = NULL; 446169240Sjfv } 447169240Sjfv NG_SEND_DATA_ONLY(error, sc->hook, m); 448169240Sjfv 449169240Sjfv return (total); 450169240Sjfv} 451169240Sjfv 452169240Sjfv/* 453169240Sjfv * Receive data coming from the device one char at a time, when it is not in 454169240Sjfv * bypass mode. 455173788Sjfv */ 456173788Sjfvstatic int 457169240Sjfvngt_rint(struct tty *tp, char c, int flags) 458169240Sjfv{ 459169240Sjfv sc_p sc = ttyhook_softc(tp); 460169240Sjfv node_p node = sc->node; 461177867Sjfv struct mbuf *m; 462169240Sjfv int error = 0; 463169240Sjfv 464169240Sjfv tty_lock_assert(tp, MA_OWNED); 465173788Sjfv 466169240Sjfv if (sc->hook == NULL) 467173788Sjfv return (0); 468177867Sjfv 469169240Sjfv if (flags != 0) { 470169240Sjfv /* framing error or overrun on this char */ 471169240Sjfv if (sc->flags & FLG_DEBUG) 472169240Sjfv log(LOG_DEBUG, "%s: line error %x\n", 473169240Sjfv NG_NODE_NAME(node), flags); 474169240Sjfv return (0); 475169240Sjfv } 476169240Sjfv 477169240Sjfv /* Get a new header mbuf if we need one */ 478169240Sjfv if (!(m = sc->m)) { 479169240Sjfv MGETHDR(m, M_NOWAIT, MT_DATA); 480169240Sjfv if (!m) { 481169240Sjfv if (sc->flags & FLG_DEBUG) 482169240Sjfv log(LOG_ERR, 483169240Sjfv "%s: can't get mbuf\n", NG_NODE_NAME(node)); 484169240Sjfv return (ENOBUFS); 485169240Sjfv } 486169240Sjfv m->m_len = m->m_pkthdr.len = 0; 487169589Sjfv m->m_pkthdr.rcvif = NULL; 488169240Sjfv sc->m = m; 489169240Sjfv } 490169240Sjfv 491169240Sjfv /* Add char to mbuf */ 492176667Sjfv *mtod(m, u_char *) = c; 493169240Sjfv m->m_data++; 494177867Sjfv m->m_len++; 495169240Sjfv m->m_pkthdr.len++; 496169240Sjfv 497169240Sjfv /* Ship off mbuf if it's time */ 498169240Sjfv if (sc->hotchar == -1 || c == sc->hotchar || m->m_len >= MHLEN) { 499169240Sjfv m->m_data = m->m_pktdat; 500169240Sjfv sc->m = NULL; 501169240Sjfv NG_SEND_DATA_ONLY(error, sc->hook, m); /* Will queue */ 502169240Sjfv } 503169240Sjfv 504169240Sjfv return (error); 505169240Sjfv} 506169240Sjfv 507169240Sjfvstatic size_t 508169240Sjfvngt_rint_poll(struct tty *tp) 509169240Sjfv{ 510169240Sjfv /* We can always accept input */ 511169240Sjfv return (1); 512169240Sjfv} 513169240Sjfv 514169240Sjfv