/* $OpenBSD: tty.c,v 1.54 2002/07/11 22:48:51 art Exp $ */ /* $NetBSD: tty.c,v 1.68.4.2 1996/06/06 16:04:52 thorpej Exp $ */ /*- * Copyright (c) 1982, 1986, 1990, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tty.c 8.8 (Berkeley) 1/21/94 */ #include #include #include #include #define TTYDEFCHARS #include #undef TTYDEFCHARS #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int ttnread(struct tty *); static void ttyblock(struct tty *); void ttyunblock(struct tty *); static void ttyecho(int, struct tty *); static void ttyrubo(struct tty *, int); static int proc_compare(struct proc *, struct proc *); int filt_ttyread(struct knote *kn, long hint); void filt_ttyrdetach(struct knote *kn); int filt_ttywrite(struct knote *kn, long hint); void filt_ttywdetach(struct knote *kn); /* Symbolic sleep message strings. */ char ttclos[] = "ttycls"; char ttopen[] = "ttyopn"; char ttybg[] = "ttybg"; char ttyin[] = "ttyin"; char ttyout[] = "ttyout"; /* * Table with character classes and parity. The 8th bit indicates parity, * the 7th bit indicates the character is an alphameric or underscore (for * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits * are 0 then the character needs no special processing on output; classes * other than 0 might be translated or (not currently) require delays. */ #define E 0x00 /* Even parity. */ #define O 0x80 /* Odd parity. */ #define PARITY(c) (char_type[c] & O) #define ALPHA 0x40 /* Alpha or underscore. */ #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) #define CCLASSMASK 0x3f #define CCLASS(c) (char_type[c] & CCLASSMASK) #define BS BACKSPACE #define CC CONTROL #define CR RETURN #define NA ORDINARY | ALPHA #define NL NEWLINE #define NO ORDINARY #define TB TAB #define VT VTAB u_char const char_type[] = { E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ /* * Meta chars; should be settable per character set; * for now, treat them all as normal characters. */ NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, }; #undef BS #undef CC #undef CR #undef NA #undef NL #undef NO #undef TB #undef VT #define islower(c) ((c) >= 'a' && (c) <= 'z') #define isupper(c) ((c) >= 'A' && (c) <= 'Z') #define tolower(c) ((c) - 'A' + 'a') #define toupper(c) ((c) - 'a' + 'A') struct ttylist_head ttylist; /* TAILQ_HEAD */ int tty_count; int64_t tk_cancc, tk_nin, tk_nout, tk_rawcc; /* * Initial open of tty, or (re)entry to standard tty line discipline. */ int ttyopen(device, tp) dev_t device; register struct tty *tp; { int s; s = spltty(); tp->t_dev = device; if (!ISSET(tp->t_state, TS_ISOPEN)) { SET(tp->t_state, TS_ISOPEN); bzero(&tp->t_winsize, sizeof(tp->t_winsize)); #ifdef COMPAT_OLDTTY tp->t_flags = 0; #endif } CLR(tp->t_state, TS_WOPEN); splx(s); return (0); } /* * Handle close() on a tty line: flush and set to initial state, * bumping generation number so that pending read/write calls * can detect recycling of the tty. */ int ttyclose(tp) register struct tty *tp; { extern struct tty *constty; /* Temporary virtual console. */ if (constty == tp) constty = NULL; ttyflush(tp, FREAD | FWRITE); tp->t_gen++; tp->t_pgrp = NULL; tp->t_session = NULL; tp->t_state = 0; return (0); } #define FLUSHQ(q) { \ if ((q)->c_cc) \ ndflush(q, (q)->c_cc); \ } /* Is 'c' a line delimiter ("break" character)? */ #define TTBREAKC(c, lflag) \ ((c) == '\n' || (((c) == cc[VEOF] || (c) == cc[VEOL] || \ ((c) == cc[VEOL2] && (lflag & IEXTEN))) && (c) != _POSIX_VDISABLE)) /* * Process input of a single character received on a tty. */ int ttyinput(c, tp) register int c; register struct tty *tp; { register int iflag, lflag; register u_char *cc; int i, error; int s; add_tty_randomness(tp->t_dev << 8 | c); /* * If receiver is not enabled, drop it. */ if (!ISSET(tp->t_cflag, CREAD)) return (0); /* * If input is pending take it first. */ lflag = tp->t_lflag; s = spltty(); if (ISSET(lflag, PENDIN)) ttypend(tp); splx(s); /* * Gather stats. */ if (ISSET(lflag, ICANON)) { ++tk_cancc; ++tp->t_cancc; } else { ++tk_rawcc; ++tp->t_rawcc; } ++tk_nin; /* Handle exceptional conditions (break, parity, framing). */ cc = tp->t_cc; iflag = tp->t_iflag; if ((error = (ISSET(c, TTY_ERRORMASK))) != 0) { CLR(c, TTY_ERRORMASK); if (ISSET(error, TTY_FE) && !c) { /* Break. */ if (ISSET(iflag, IGNBRK)) return (0); ttyflush(tp, FREAD | FWRITE); if (ISSET(iflag, BRKINT)) { pgsignal(tp->t_pgrp, SIGINT, 1); goto endcase; } else if (ISSET(iflag, PARMRK)) goto parmrk; } else if ((ISSET(error, TTY_PE) && ISSET(iflag, INPCK)) || ISSET(error, TTY_FE)) { if (ISSET(iflag, IGNPAR)) goto endcase; else if (ISSET(iflag, PARMRK)) { parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); if (ISSET(iflag, ISTRIP) || c != 0377) (void)putc(0 | TTY_QUOTE, &tp->t_rawq); (void)putc(c | TTY_QUOTE, &tp->t_rawq); goto endcase; } else c = 0; } } if (c == 0377 && !ISSET(iflag, ISTRIP) && ISSET(iflag, PARMRK)) goto parmrk; /* * In tandem mode, check high water mark. */ if (ISSET(iflag, IXOFF) || ISSET(tp->t_cflag, CHWFLOW)) ttyblock(tp); if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) CLR(c, 0x80); if (!ISSET(lflag, EXTPROC)) { /* * Check for literal nexting very first */ if (ISSET(tp->t_state, TS_LNCH)) { SET(c, TTY_QUOTE); CLR(tp->t_state, TS_LNCH); } /* * Scan for special characters. This code * is really just a big case statement with * non-constant cases. The bottom of the * case statement is labeled ``endcase'', so goto * it after a case match, or similar. */ /* * Control chars which aren't controlled * by ICANON, ISIG, or IXON. */ if (ISSET(lflag, IEXTEN)) { if (CCEQ(cc[VLNEXT], c)) { if (ISSET(lflag, ECHO)) { if (ISSET(lflag, ECHOE)) { (void)ttyoutput('^', tp); (void)ttyoutput('\b', tp); } else ttyecho(c, tp); } SET(tp->t_state, TS_LNCH); goto endcase; } if (CCEQ(cc[VDISCARD], c)) { if (ISSET(lflag, FLUSHO)) CLR(tp->t_lflag, FLUSHO); else { ttyflush(tp, FWRITE); ttyecho(c, tp); if (tp->t_rawq.c_cc + tp->t_canq.c_cc) ttyretype(tp); SET(tp->t_lflag, FLUSHO); } goto startoutput; } } /* * Signals. */ if (ISSET(lflag, ISIG)) { if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { if (!ISSET(lflag, NOFLSH)) ttyflush(tp, FREAD | FWRITE); ttyecho(c, tp); pgsignal(tp->t_pgrp, CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); goto endcase; } if (CCEQ(cc[VSUSP], c)) { if (!ISSET(lflag, NOFLSH)) ttyflush(tp, FREAD); ttyecho(c, tp); pgsignal(tp->t_pgrp, SIGTSTP, 1); goto endcase; } } /* * Handle start/stop characters. */ if (ISSET(iflag, IXON)) { if (CCEQ(cc[VSTOP], c)) { if (!ISSET(tp->t_state, TS_TTSTOP)) { SET(tp->t_state, TS_TTSTOP); (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0); return (0); } if (!CCEQ(cc[VSTART], c)) return (0); /* * if VSTART == VSTOP then toggle */ goto endcase; } if (CCEQ(cc[VSTART], c)) goto restartoutput; } /* * IGNCR, ICRNL, & INLCR */ if (c == '\r') { if (ISSET(iflag, IGNCR)) goto endcase; else if (ISSET(iflag, ICRNL)) c = '\n'; } else if (c == '\n' && ISSET(iflag, INLCR)) c = '\r'; } if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { /* * From here on down canonical mode character * processing takes place. */ /* * upper case or specials with IUCLC and XCASE */ if (ISSET(lflag, XCASE) && ISSET(iflag, IUCLC)) { if (ISSET(tp->t_state, TS_BKSL)) { CLR(tp->t_state, TS_BKSL); switch (c) { case '\'': c = '`'; break; case '!': c = '|'; break; case '^': c = '~'; break; case '(': c = '{'; break; case ')': c = '}'; break; } } else if (c == '\\') { SET(tp->t_state, TS_BKSL); goto endcase; } else if (isupper(c)) c = tolower(c); } else if (ISSET(iflag, IUCLC) && isupper(c)) c = tolower(c); /* * erase (^H / ^?) */ if (CCEQ(cc[VERASE], c)) { if (tp->t_rawq.c_cc) ttyrub(unputc(&tp->t_rawq), tp); goto endcase; } /* * kill (^U) */ if (CCEQ(cc[VKILL], c)) { if (ISSET(lflag, ECHOKE) && tp->t_rawq.c_cc == tp->t_rocount && !ISSET(lflag, ECHOPRT)) while (tp->t_rawq.c_cc) ttyrub(unputc(&tp->t_rawq), tp); else { ttyecho(c, tp); if (ISSET(lflag, ECHOK) || ISSET(lflag, ECHOKE)) ttyecho('\n', tp); FLUSHQ(&tp->t_rawq); tp->t_rocount = 0; } CLR(tp->t_state, TS_LOCAL); goto endcase; } /* * word erase (^W) */ if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { int alt = ISSET(lflag, ALTWERASE); int ctype; /* * erase whitespace */ while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') ttyrub(c, tp); if (c == -1) goto endcase; /* * erase last char of word and remember the * next chars type (for ALTWERASE) */ ttyrub(c, tp); c = unputc(&tp->t_rawq); if (c == -1) goto endcase; if (c == ' ' || c == '\t') { (void)putc(c, &tp->t_rawq); goto endcase; } ctype = ISALPHA(c); /* * erase rest of word */ do { ttyrub(c, tp); c = unputc(&tp->t_rawq); if (c == -1) goto endcase; } while (c != ' ' && c != '\t' && (alt == 0 || ISALPHA(c) == ctype)); (void)putc(c, &tp->t_rawq); goto endcase; } /* * reprint line (^R) */ if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { ttyretype(tp); goto endcase; } /* * ^T - kernel info and generate SIGINFO */ if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { if (ISSET(lflag, ISIG)) pgsignal(tp->t_pgrp, SIGINFO, 1); if (!ISSET(lflag, NOKERNINFO)) ttyinfo(tp); goto endcase; } } /* * Check for input buffer overflow */ if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) { if (ISSET(iflag, IMAXBEL)) { if (tp->t_outq.c_cc < tp->t_hiwat) (void)ttyoutput(CTRL('g'), tp); } else ttyflush(tp, FREAD | FWRITE); goto endcase; } /* * Put data char in q for user and * wakeup on seeing a line delimiter. */ if (putc(c, &tp->t_rawq) >= 0) { if (!ISSET(lflag, ICANON)) { ttwakeup(tp); ttyecho(c, tp); goto endcase; } if (TTBREAKC(c, lflag)) { tp->t_rocount = 0; catq(&tp->t_rawq, &tp->t_canq); ttwakeup(tp); } else if (tp->t_rocount++ == 0) tp->t_rocol = tp->t_column; if (ISSET(tp->t_state, TS_ERASE)) { /* * end of prterase \.../ */ CLR(tp->t_state, TS_ERASE); (void)ttyoutput('/', tp); } i = tp->t_column; ttyecho(c, tp); if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { /* * Place the cursor over the '^' of the ^D. */ i = min(2, tp->t_column - i); while (i > 0) { (void)ttyoutput('\b', tp); i--; } } } endcase: /* * IXANY means allow any character to restart output. */ if (ISSET(tp->t_state, TS_TTSTOP) && !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) return (0); restartoutput: CLR(tp->t_lflag, FLUSHO); CLR(tp->t_state, TS_TTSTOP); startoutput: return (ttstart(tp)); } /* * Output a single character on a tty, doing output processing * as needed (expanding tabs, newline processing, etc.). * Returns < 0 if succeeds, otherwise returns char to resend. * Must be recursive. */ int ttyoutput(c, tp) register int c; register struct tty *tp; { register long oflag; register int col, notout, s, c2; oflag = tp->t_oflag; if (!ISSET(oflag, OPOST)) { tk_nout++; tp->t_outcc++; if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) return (c); return (-1); } /* * Do tab expansion if OXTABS is set. Special case if we external * processing, we don't do the tab expansion because we'll probably * get it wrong. If tab expansion needs to be done, let it happen * externally. */ CLR(c, ~TTY_CHARMASK); if (c == '\t' && ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { c = 8 - (tp->t_column & 7); if (ISSET(tp->t_lflag, FLUSHO)) { notout = 0; } else { s = spltty(); /* Don't interrupt tabs. */ notout = b_to_q(" ", c, &tp->t_outq); c -= notout; tk_nout += c; tp->t_outcc += c; splx(s); } tp->t_column += c; return (notout ? '\t' : -1); } if (c == CEOT && ISSET(oflag, ONOEOT)) return (-1); /* * Newline translation: if ONLCR is set, * translate newline into "\r\n". If OCRNL * is set, translate '\r' into '\n'. */ if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { tk_nout++; tp->t_outcc++; if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) return (c); tp->t_column = 0; } else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) c = '\n'; if (ISSET(tp->t_oflag, OLCUC) && islower(c)) c = toupper(c); else if (ISSET(tp->t_oflag, OLCUC) && ISSET(tp->t_lflag, XCASE)) { c2 = c; switch (c) { case '`': c2 = '\''; break; case '|': c2 = '!'; break; case '~': c2 = '^'; break; case '{': c2 = '('; break; case '}': c2 = ')'; break; } if (c == '\\' || isupper(c) || c != c2) { tk_nout++; tp->t_outcc++; if (putc('\\', &tp->t_outq)) return (c); c = c2; } } if (ISSET(tp->t_oflag, ONOCR) && c == '\r' && tp->t_column == 0) return (-1); tk_nout++; tp->t_outcc++; if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) return (c); col = tp->t_column; switch (CCLASS(c)) { case BACKSPACE: if (col > 0) --col; break; case CONTROL: break; case NEWLINE: if (ISSET(tp->t_oflag, ONLRET) || ISSET(tp->t_oflag, OCRNL)) col = 0; break; case RETURN: col = 0; break; case ORDINARY: ++col; break; case TAB: col = (col + 8) & ~7; break; } tp->t_column = col; return (-1); } /* * Ioctls for all tty devices. Called after line-discipline specific ioctl * has been called to do discipline-specific functions and/or reject any * of these ioctl commands. */ /* ARGSUSED */ int ttioctl(tp, cmd, data, flag, p) register struct tty *tp; u_long cmd; caddr_t data; int flag; struct proc *p; { extern struct tty *constty; /* Temporary virtual console. */ extern int nlinesw; int s, error; /* If the ioctl involves modification, hang if in the background. */ switch (cmd) { case TIOCFLUSH: case TIOCDRAIN: case TIOCSBRK: case TIOCCBRK: case TIOCSETA: case TIOCSETD: case TIOCSETAF: case TIOCSETAW: #ifdef notdef case TIOCSPGRP: #endif case TIOCSTAT: case TIOCSTI: case TIOCSWINSZ: #ifdef COMPAT_OLDTTY case TIOCLBIC: case TIOCLBIS: case TIOCLSET: case TIOCSETC: case OTIOCSETD: case TIOCSETN: case TIOCSETP: case TIOCSLTC: #endif while (isbackground(p, tp) && (p->p_flag & P_PPWAIT) == 0 && (p->p_sigignore & sigmask(SIGTTOU)) == 0 && (p->p_sigmask & sigmask(SIGTTOU)) == 0) { if (p->p_pgrp->pg_jobc == 0) return (EIO); pgsignal(p->p_pgrp, SIGTTOU, 1); error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, ttybg, 0); if (error) return (error); } break; } switch (cmd) { /* Process the ioctl. */ case FIOASYNC: /* set/clear async i/o */ s = spltty(); if (*(int *)data) SET(tp->t_state, TS_ASYNC); else CLR(tp->t_state, TS_ASYNC); splx(s); break; case FIONBIO: /* set/clear non-blocking i/o */ break; /* XXX: delete. */ case FIONREAD: /* get # bytes to read */ s = spltty(); *(int *)data = ttnread(tp); splx(s); break; case TIOCEXCL: /* set exclusive use of tty */ s = spltty(); SET(tp->t_state, TS_XCLUDE); splx(s); break; case TIOCFLUSH: { /* flush buffers */ register int flags = *(int *)data; if (flags == 0) flags = FREAD | FWRITE; else flags &= FREAD | FWRITE; ttyflush(tp, flags); break; } case TIOCCONS: { /* become virtual console */ if (*(int *)data) { struct nameidata nid; if (constty != NULL && constty != tp && ISSET(constty->t_state, TS_CARR_ON | TS_ISOPEN) == (TS_CARR_ON | TS_ISOPEN)) return (EBUSY); /* ensure user can open the real console */ NDINIT(&nid, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); error = namei(&nid); if (error) return (error); vn_lock(nid.ni_vp, LK_EXCLUSIVE | LK_RETRY, p); error = VOP_ACCESS(nid.ni_vp, VREAD, p->p_ucred, p); VOP_UNLOCK(nid.ni_vp, 0, p); vrele(nid.ni_vp); if (error) return (error); constty = tp; } else if (tp == constty) constty = NULL; break; } case TIOCDRAIN: /* wait till output drained */ if ((error = ttywait(tp)) != 0) return (error); break; case TIOCGETA: { /* get termios struct */ struct termios *t = (struct termios *)data; bcopy(&tp->t_termios, t, sizeof(struct termios)); break; } case TIOCGETD: /* get line discipline */ *(int *)data = tp->t_line; break; case TIOCGWINSZ: /* get window size */ *(struct winsize *)data = tp->t_winsize; break; case TIOCGPGRP: /* get pgrp of tty */ if (!isctty(p, tp) && suser(p->p_ucred, &p->p_acflag)) return (ENOTTY); *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; break; #ifdef TIOCHPCL case TIOCHPCL: /* hang up on last close */ s = spltty(); SET(tp->t_cflag, HUPCL); splx(s); break; #endif case TIOCNXCL: /* reset exclusive use of tty */ s = spltty(); CLR(tp->t_state, TS_XCLUDE); splx(s); break; case TIOCOUTQ: /* output queue size */ *(int *)data = tp->t_outq.c_cc; break; case TIOCSETA: /* set termios struct */ case TIOCSETAW: /* drain output, set */ case TIOCSETAF: { /* drn out, fls in, set */ register struct termios *t = (struct termios *)data; s = spltty(); if (cmd == TIOCSETAW || cmd == TIOCSETAF) { if ((error = ttywait(tp)) != 0) { splx(s); return (error); } if (cmd == TIOCSETAF) ttyflush(tp, FREAD); } if (!ISSET(t->c_cflag, CIGNORE)) { /* * Set device hardware. */ if (tp->t_param && (error = (*tp->t_param)(tp, t))) { splx(s); return (error); } else { if (!ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, CLOCAL) && !ISSET(t->c_cflag, CLOCAL)) { CLR(tp->t_state, TS_ISOPEN); SET(tp->t_state, TS_WOPEN); ttwakeup(tp); } tp->t_cflag = t->c_cflag; tp->t_ispeed = t->c_ispeed; tp->t_ospeed = t->c_ospeed; if (t->c_ospeed == 0 && tp->t_session && tp->t_session->s_leader) psignal(tp->t_session->s_leader, SIGHUP); } ttsetwater(tp); } if (cmd != TIOCSETAF) { if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON)) { if (ISSET(t->c_lflag, ICANON)) { SET(tp->t_lflag, PENDIN); ttwakeup(tp); } else { struct clist tq; catq(&tp->t_rawq, &tp->t_canq); tq = tp->t_rawq; tp->t_rawq = tp->t_canq; tp->t_canq = tq; CLR(tp->t_lflag, PENDIN); } } } tp->t_iflag = t->c_iflag; tp->t_oflag = t->c_oflag; /* * Make the EXTPROC bit read only. */ if (ISSET(tp->t_lflag, EXTPROC)) SET(t->c_lflag, EXTPROC); else CLR(t->c_lflag, EXTPROC); tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); splx(s); break; } case TIOCSETD: { /* set line discipline */ register int t = *(int *)data; dev_t device = tp->t_dev; if ((u_int)t >= nlinesw) return (ENXIO); if (t != tp->t_line) { s = spltty(); (*linesw[tp->t_line].l_close)(tp, flag); error = (*linesw[t].l_open)(device, tp); if (error) { (void)(*linesw[tp->t_line].l_open)(device, tp); splx(s); return (error); } tp->t_line = t; splx(s); } break; } case TIOCSTART: /* start output, like ^Q */ s = spltty(); if (ISSET(tp->t_state, TS_TTSTOP) || ISSET(tp->t_lflag, FLUSHO)) { CLR(tp->t_lflag, FLUSHO); CLR(tp->t_state, TS_TTSTOP); ttstart(tp); } splx(s); break; case TIOCSTI: /* simulate terminal input */ if (p->p_ucred->cr_uid && (flag & FREAD) == 0) return (EPERM); if (p->p_ucred->cr_uid && !isctty(p, tp)) return (EACCES); (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); break; case TIOCSTOP: /* stop output, like ^S */ s = spltty(); if (!ISSET(tp->t_state, TS_TTSTOP)) { SET(tp->t_state, TS_TTSTOP); (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0); } splx(s); break; case TIOCSCTTY: /* become controlling tty */ /* Session ctty vnode pointer set in vnode layer. */ if (!SESS_LEADER(p) || ((p->p_session->s_ttyvp || tp->t_session) && (tp->t_session != p->p_session))) return (EPERM); SESSHOLD(p->p_session); tp->t_session = p->p_session; tp->t_pgrp = p->p_pgrp; p->p_session->s_ttyp = tp; p->p_flag |= P_CONTROLT; break; case TIOCSPGRP: { /* set pgrp of tty */ register struct pgrp *pgrp = pgfind(*(int *)data); if (!isctty(p, tp)) return (ENOTTY); else if (pgrp == NULL) return (EINVAL); else if (pgrp->pg_session != p->p_session) return (EPERM); tp->t_pgrp = pgrp; break; } case TIOCSTAT: /* get load avg stats */ ttyinfo(tp); break; case TIOCSWINSZ: /* set window size */ if (bcmp((caddr_t)&tp->t_winsize, data, sizeof (struct winsize))) { tp->t_winsize = *(struct winsize *)data; pgsignal(tp->t_pgrp, SIGWINCH, 1); } break; default: #ifdef COMPAT_OLDTTY return (ttcompat(tp, cmd, data, flag, p)); #else return (-1); #endif } return (0); } int ttselect(device, rw, p) dev_t device; int rw; struct proc *p; { register struct tty *tp; int nread, s; tp = (*cdevsw[major(device)].d_tty)(device); s = spltty(); switch (rw) { case FREAD: nread = ttnread(tp); if (nread > 0 || (!ISSET(tp->t_cflag, CLOCAL) && !ISSET(tp->t_state, TS_CARR_ON))) goto win; selrecord(p, &tp->t_rsel); break; case FWRITE: if (tp->t_outq.c_cc <= tp->t_lowat) { win: splx(s); return (1); } selrecord(p, &tp->t_wsel); break; } splx(s); return (0); } struct filterops ttyread_filtops = { 1, NULL, filt_ttyrdetach, filt_ttyread }; struct filterops ttywrite_filtops = { 1, NULL, filt_ttywdetach, filt_ttywrite }; int ttkqfilter(dev, kn) dev_t dev; struct knote *kn; { struct tty *tp = (*cdevsw[major(dev)].d_tty)(dev); struct klist *klist; int s; switch (kn->kn_filter) { case EVFILT_READ: klist = &tp->t_rsel.si_note; kn->kn_fop = &ttyread_filtops; break; case EVFILT_WRITE: klist = &tp->t_wsel.si_note; kn->kn_fop = &ttywrite_filtops; break; default: return (1); } kn->kn_hook = (caddr_t)((u_long)dev); s = spltty(); SLIST_INSERT_HEAD(klist, kn, kn_selnext); splx(s); return (0); } void filt_ttyrdetach(struct knote *kn) { dev_t dev = (dev_t)((u_long)kn->kn_hook); struct tty *tp = (*cdevsw[major(dev)].d_tty)(dev); int s = spltty(); SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext); splx(s); } int filt_ttyread(struct knote *kn, long hint) { dev_t dev = (dev_t)((u_long)kn->kn_hook); struct tty *tp = (*cdevsw[major(dev)].d_tty)(dev); int s; s = spltty(); kn->kn_data = ttnread(tp); splx(s); if (!ISSET(tp->t_state, CLOCAL) && !ISSET(tp->t_state, TS_CARR_ON)) { kn->kn_flags |= EV_EOF; return (1); } return (kn->kn_data > 0); } void filt_ttywdetach(struct knote *kn) { dev_t dev = (dev_t)((u_long)kn->kn_hook); struct tty *tp = (*cdevsw[major(dev)].d_tty)(dev); int s = spltty(); SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext); splx(s); } int filt_ttywrite(kn, hint) struct knote *kn; long hint; { dev_t dev = (dev_t)((u_long)kn->kn_hook); struct tty *tp = (*cdevsw[major(dev)].d_tty)(dev); kn->kn_data = tp->t_outq.c_cc; return (kn->kn_data <= tp->t_lowat); } static int ttnread(tp) struct tty *tp; { int nread; splassert(IPL_TTY); if (ISSET(tp->t_lflag, PENDIN)) ttypend(tp); nread = tp->t_canq.c_cc; if (!ISSET(tp->t_lflag, ICANON)) { nread += tp->t_rawq.c_cc; if (nread < tp->t_cc[VMIN] && !tp->t_cc[VTIME]) nread = 0; } return (nread); } /* * Wait for output to drain. */ int ttywait(tp) register struct tty *tp; { int error, s; error = 0; s = spltty(); while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && (ISSET(tp->t_state, TS_CARR_ON) || ISSET(tp->t_cflag, CLOCAL)) && tp->t_oproc) { (*tp->t_oproc)(tp); if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && (ISSET(tp->t_state, TS_CARR_ON) || ISSET(tp->t_cflag, CLOCAL)) && tp->t_oproc) { SET(tp->t_state, TS_ASLEEP); error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, ttyout, 0); if (error) break; } else break; } splx(s); return (error); } /* * Flush if successfully wait. */ int ttywflush(tp) struct tty *tp; { int error; if ((error = ttywait(tp)) == 0) ttyflush(tp, FREAD); return (error); } /* * Flush tty read and/or write queues, notifying anyone waiting. */ void ttyflush(tp, rw) register struct tty *tp; int rw; { register int s; s = spltty(); if (rw & FREAD) { FLUSHQ(&tp->t_canq); FLUSHQ(&tp->t_rawq); tp->t_rocount = 0; tp->t_rocol = 0; CLR(tp->t_state, TS_LOCAL); ttyunblock(tp); ttwakeup(tp); } if (rw & FWRITE) { CLR(tp->t_state, TS_TTSTOP); (*cdevsw[major(tp->t_dev)].d_stop)(tp, rw); FLUSHQ(&tp->t_outq); wakeup((caddr_t)&tp->t_outq); selwakeup(&tp->t_wsel); } splx(s); } /* * Copy in the default termios characters. */ void ttychars(tp) struct tty *tp; { bcopy(ttydefchars, tp->t_cc, sizeof(ttydefchars)); } /* * Send stop character on input overflow. */ static void ttyblock(tp) register struct tty *tp; { register int total; total = tp->t_rawq.c_cc + tp->t_canq.c_cc; if (tp->t_rawq.c_cc > TTYHOG) { ttyflush(tp, FREAD | FWRITE); CLR(tp->t_state, TS_TBLOCK); } /* * Block further input iff: current input > threshold * AND input is available to user program. */ if ((total >= TTYHOG / 2 && !ISSET(tp->t_state, TS_TBLOCK) && !ISSET(tp->t_lflag, ICANON)) || tp->t_canq.c_cc > 0) { if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) { SET(tp->t_state, TS_TBLOCK); ttstart(tp); } /* Try to block remote output via hardware flow control. */ if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && (*tp->t_hwiflow)(tp, 1) != 0) SET(tp->t_state, TS_TBLOCK); } } void ttrstrt(tp_arg) void *tp_arg; { struct tty *tp; int s; #ifdef DIAGNOSTIC if (tp_arg == NULL) panic("ttrstrt"); #endif tp = tp_arg; s = spltty(); CLR(tp->t_state, TS_TIMEOUT); ttstart(tp); splx(s); } int ttstart(tp) struct tty *tp; { if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ (*tp->t_oproc)(tp); return (0); } /* * "close" a line discipline */ int ttylclose(tp, flag) struct tty *tp; int flag; { if (flag & FNONBLOCK) ttyflush(tp, FREAD | FWRITE); else ttywflush(tp); return (0); } /* * Handle modem control transition on a tty. * Flag indicates new state of carrier. * Returns 0 if the line should be turned off, otherwise 1. */ int ttymodem(tp, flag) register struct tty *tp; int flag; { if (!ISSET(tp->t_state, TS_WOPEN) && ISSET(tp->t_cflag, MDMBUF)) { /* * MDMBUF: do flow control according to carrier flag */ if (flag) { CLR(tp->t_state, TS_TTSTOP); ttstart(tp); } else if (!ISSET(tp->t_state, TS_TTSTOP)) { SET(tp->t_state, TS_TTSTOP); (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0); } } else if (flag == 0) { /* * Lost carrier. */ CLR(tp->t_state, TS_CARR_ON); if (ISSET(tp->t_state, TS_ISOPEN) && !ISSET(tp->t_cflag, CLOCAL)) { if (tp->t_session && tp->t_session->s_leader) psignal(tp->t_session->s_leader, SIGHUP); ttyflush(tp, FREAD | FWRITE); return (0); } } else { /* * Carrier now on. */ SET(tp->t_state, TS_CARR_ON); ttwakeup(tp); } return (1); } /* * Default modem control routine (for other line disciplines). * Return argument flag, to turn off device on carrier drop. */ int nullmodem(tp, flag) register struct tty *tp; int flag; { if (flag) SET(tp->t_state, TS_CARR_ON); else { CLR(tp->t_state, TS_CARR_ON); if (ISSET(tp->t_state, TS_ISOPEN) && !ISSET(tp->t_cflag, CLOCAL)) { if (tp->t_session && tp->t_session->s_leader) psignal(tp->t_session->s_leader, SIGHUP); ttyflush(tp, FREAD | FWRITE); return (0); } } return (1); } /* * Reinput pending characters after state switch * call at spltty(). */ void ttypend(struct tty *tp) { struct clist tq; int c; splassert(IPL_TTY); CLR(tp->t_lflag, PENDIN); SET(tp->t_state, TS_TYPEN); tq = tp->t_rawq; tp->t_rawq.c_cc = 0; tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0; while ((c = getc(&tq)) >= 0) ttyinput(c, tp); CLR(tp->t_state, TS_TYPEN); } void ttvtimeout(void *); void ttvtimeout(void *arg) { struct tty *tp = (struct tty *)arg; wakeup(&tp->t_rawq); } /* * Process a read call on a tty device. */ int ttread(tp, uio, flag) register struct tty *tp; struct uio *uio; int flag; { struct timeout *stime = NULL; struct proc *p = curproc; int s, first, error = 0; u_char *cc = tp->t_cc; struct clist *qp; int last_cc = 0; long lflag; int c; loop: lflag = tp->t_lflag; s = spltty(); /* * take pending input first */ if (ISSET(lflag, PENDIN)) ttypend(tp); splx(s); /* * Hang process if it's in the background. */ if (isbackground(p, tp)) { if ((p->p_sigignore & sigmask(SIGTTIN)) || (p->p_sigmask & sigmask(SIGTTIN)) || p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0) { error = EIO; goto out; } pgsignal(p->p_pgrp, SIGTTIN, 1); error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0); if (error) goto out; goto loop; } s = spltty(); if (!ISSET(lflag, ICANON)) { int m = cc[VMIN]; long t; /* * Note - since cc[VTIME] is a u_char, this won't overflow * until we have 32-bit longs and a hz > 8388608. * Hopefully this code and 32-bit longs are obsolete by then. */ t = cc[VTIME] * hz / 10; qp = &tp->t_rawq; /* * Check each of the four combinations. * (m > 0 && t == 0) is the normal read case. * It should be fairly efficient, so we check that and its * companion case (m == 0 && t == 0) first. */ if (t == 0) { if (qp->c_cc < m) goto sleep; goto read; } if (m > 0) { if (qp->c_cc <= 0) goto sleep; if (qp->c_cc >= m) goto read; if (stime == NULL) { alloc_timer: stime = malloc(sizeof(*stime), M_TEMP, M_WAITOK); timeout_set(stime, ttvtimeout, tp); timeout_add(stime, t); } else if (qp->c_cc > last_cc) { /* got a character, restart timer */ timeout_add(stime, t); } } else { /* m == 0 */ if (qp->c_cc > 0) goto read; if (stime == NULL) { goto alloc_timer; } } last_cc = qp->c_cc; if (stime && !timeout_triggered(stime)) { goto sleep; } } else if ((qp = &tp->t_canq)->c_cc <= 0) { int carrier; sleep: /* * If there is no input, sleep on rawq * awaiting hardware receipt and notification. * If we have data, we don't need to check for carrier. */ carrier = ISSET(tp->t_state, TS_CARR_ON) || ISSET(tp->t_cflag, CLOCAL); if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) { splx(s); error = 0; goto out; } if (flag & IO_NDELAY) { splx(s); error = EWOULDBLOCK; goto out; } error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, carrier ? ttyin : ttopen, 0); splx(s); if (stime && timeout_triggered(stime)) error = EWOULDBLOCK; if (cc[VMIN] == 0 && error == EWOULDBLOCK) { error = 0; goto out; } if (error && error != EWOULDBLOCK) goto out; goto loop; } read: splx(s); /* * Input present, check for input mapping and processing. */ first = 1; while ((c = getc(qp)) >= 0) { /* * delayed suspend (^Y) */ if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { pgsignal(tp->t_pgrp, SIGTSTP, 1); if (first) { error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0); if (error) break; goto loop; } break; } /* * Interpret EOF only in canonical mode. */ if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) break; /* * Give user character. */ error = ureadc(c, uio); if (error) break; if (uio->uio_resid == 0) break; /* * In canonical mode check for a "break character" * marking the end of a "line of input". */ if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) break; first = 0; } /* * Look to unblock output now that (presumably) * the input queue has gone down. */ s = spltty(); if (tp->t_rawq.c_cc < TTYHOG/5) ttyunblock(tp); splx(s); out: if (stime) { timeout_del(stime); free(stime, M_TEMP); } return (error); } /* Call at spltty */ void ttyunblock(struct tty *tp) { u_char *cc = tp->t_cc; splassert(IPL_TTY); if (ISSET(tp->t_state, TS_TBLOCK)) { if (ISSET(tp->t_iflag, IXOFF) && cc[VSTART] != _POSIX_VDISABLE && putc(cc[VSTART], &tp->t_outq) == 0) { CLR(tp->t_state, TS_TBLOCK); ttstart(tp); } /* Try to unblock remote output via hardware flow control. */ if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && (*tp->t_hwiflow)(tp, 0) != 0) CLR(tp->t_state, TS_TBLOCK); } } /* * Check the output queue on tp for space for a kernel message (from uprintf * or tprintf). Allow some space over the normal hiwater mark so we don't * lose messages due to normal flow control, but don't let the tty run amok. * Sleeps here are not interruptible, but we return prematurely if new signals * arrive. */ int ttycheckoutq(tp, wait) register struct tty *tp; int wait; { int hiwat, s, oldsig; hiwat = tp->t_hiwat; s = spltty(); oldsig = wait ? curproc->p_siglist : 0; if (tp->t_outq.c_cc > hiwat + 200) while (tp->t_outq.c_cc > hiwat) { ttstart(tp); if (wait == 0 || curproc->p_siglist != oldsig) { splx(s); return (0); } SET(tp->t_state, TS_ASLEEP); tsleep(&tp->t_outq, PZERO - 1, "ttckoutq", hz); } splx(s); return (1); } /* * Process a write call on a tty device. */ int ttwrite(tp, uio, flag) struct tty *tp; struct uio *uio; int flag; { u_char *cp = NULL; int cc, ce; struct proc *p; int i, hiwat, cnt, error, s; u_char obuf[OBUFSIZ]; hiwat = tp->t_hiwat; cnt = uio->uio_resid; error = 0; cc = 0; loop: s = spltty(); if (!ISSET(tp->t_state, TS_CARR_ON) && !ISSET(tp->t_cflag, CLOCAL)) { if (ISSET(tp->t_state, TS_ISOPEN)) { splx(s); return (EIO); } else if (flag & IO_NDELAY) { splx(s); error = EWOULDBLOCK; goto out; } else { /* Sleep awaiting carrier. */ error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, ttopen, 0); splx(s); if (error) goto out; goto loop; } } splx(s); /* * Hang the process if it's in the background. */ p = curproc; if (isbackground(p, tp) && ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 && (p->p_sigignore & sigmask(SIGTTOU)) == 0 && (p->p_sigmask & sigmask(SIGTTOU)) == 0) { if (p->p_pgrp->pg_jobc == 0) { error = EIO; goto out; } pgsignal(p->p_pgrp, SIGTTOU, 1); error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0); if (error) goto out; goto loop; } /* * Process the user's data in at most OBUFSIZ chunks. Perform any * output translation. Keep track of high water mark, sleep on * overflow awaiting device aid in acquiring new space. */ while (uio->uio_resid > 0 || cc > 0) { if (ISSET(tp->t_lflag, FLUSHO)) { uio->uio_resid = 0; return (0); } if (tp->t_outq.c_cc > hiwat) goto ovhiwat; /* * Grab a hunk of data from the user, unless we have some * leftover from last time. */ if (cc == 0) { cc = min(uio->uio_resid, OBUFSIZ); cp = obuf; error = uiomove(cp, cc, uio); if (error) { cc = 0; break; } } /* * If nothing fancy need be done, grab those characters we * can handle without any of ttyoutput's processing and * just transfer them to the output q. For those chars * which require special processing (as indicated by the * bits in char_type), call ttyoutput. After processing * a hunk of data, look for FLUSHO so ^O's will take effect * immediately. */ while (cc > 0) { if (!ISSET(tp->t_oflag, OPOST)) ce = cc; else { ce = cc - scanc((u_int)cc, cp, char_type, CCLASSMASK); /* * If ce is zero, then we're processing * a special character through ttyoutput. */ if (ce == 0) { tp->t_rocount = 0; if (ttyoutput(*cp, tp) >= 0) { /* out of space */ goto overfull; } cp++; cc--; if (ISSET(tp->t_lflag, FLUSHO) || tp->t_outq.c_cc > hiwat) goto ovhiwat; continue; } } /* * A bunch of normal characters have been found. * Transfer them en masse to the output queue and * continue processing at the top of the loop. * If there are any further characters in this * <= OBUFSIZ chunk, the first should be a character * requiring special handling by ttyoutput. */ tp->t_rocount = 0; i = b_to_q(cp, ce, &tp->t_outq); ce -= i; tp->t_column += ce; cp += ce, cc -= ce, tk_nout += ce; tp->t_outcc += ce; if (i > 0) { /* out of space */ goto overfull; } if (ISSET(tp->t_lflag, FLUSHO) || tp->t_outq.c_cc > hiwat) break; } ttstart(tp); } out: /* * If cc is nonzero, we leave the uio structure inconsistent, as the * offset and iov pointers have moved forward, but it doesn't matter * (the call will either return short or restart with a new uio). */ uio->uio_resid += cc; return (error); overfull: /* * Since we are using ring buffers, if we can't insert any more into * the output queue, we can assume the ring is full and that someone * forgot to set the high water mark correctly. We set it and then * proceed as normal. */ hiwat = tp->t_outq.c_cc - 1; ovhiwat: ttstart(tp); s = spltty(); /* * This can only occur if FLUSHO is set in t_lflag, * or if ttstart/oproc is synchronous (or very fast). */ if (tp->t_outq.c_cc <= hiwat) { splx(s); goto loop; } if (flag & IO_NDELAY) { splx(s); uio->uio_resid += cc; return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); } SET(tp->t_state, TS_ASLEEP); error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, ttyout, 0); splx(s); if (error) goto out; goto loop; } /* * Rubout one character from the rawq of tp * as cleanly as possible. */ void ttyrub(c, tp) int c; register struct tty *tp; { register u_char *cp; register int savecol; int tabc, s; if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) return; CLR(tp->t_lflag, FLUSHO); if (ISSET(tp->t_lflag, ECHOE)) { if (tp->t_rocount == 0) { /* * Screwed by ttwrite; retype */ ttyretype(tp); return; } if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) ttyrubo(tp, 2); else { CLR(c, ~TTY_CHARMASK); switch (CCLASS(c)) { case ORDINARY: ttyrubo(tp, 1); break; case BACKSPACE: case CONTROL: case NEWLINE: case RETURN: case VTAB: if (ISSET(tp->t_lflag, ECHOCTL)) ttyrubo(tp, 2); break; case TAB: if (tp->t_rocount < tp->t_rawq.c_cc) { ttyretype(tp); return; } s = spltty(); savecol = tp->t_column; SET(tp->t_state, TS_CNTTB); SET(tp->t_lflag, FLUSHO); tp->t_column = tp->t_rocol; for (cp = firstc(&tp->t_rawq, &tabc); cp; cp = nextc(&tp->t_rawq, cp, &tabc)) ttyecho(tabc, tp); CLR(tp->t_lflag, FLUSHO); CLR(tp->t_state, TS_CNTTB); splx(s); /* savecol will now be length of the tab. */ savecol -= tp->t_column; tp->t_column += savecol; if (savecol > 8) savecol = 8; /* overflow screw */ while (--savecol >= 0) (void)ttyoutput('\b', tp); break; default: /* XXX */ #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" (void)printf(PANICSTR, c, CCLASS(c)); #ifdef notdef panic(PANICSTR, c, CCLASS(c)); #endif } } } else if (ISSET(tp->t_lflag, ECHOPRT)) { if (!ISSET(tp->t_state, TS_ERASE)) { SET(tp->t_state, TS_ERASE); (void)ttyoutput('\\', tp); } ttyecho(c, tp); } else ttyecho(tp->t_cc[VERASE], tp); --tp->t_rocount; } /* * Back over cnt characters, erasing them. */ static void ttyrubo(tp, cnt) register struct tty *tp; int cnt; { while (cnt-- > 0) { (void)ttyoutput('\b', tp); (void)ttyoutput(' ', tp); (void)ttyoutput('\b', tp); } } /* * ttyretype -- * Reprint the rawq line. Note, it is assumed that c_cc has already * been checked. */ void ttyretype(tp) register struct tty *tp; { register u_char *cp; int s, c; /* Echo the reprint character. */ if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) ttyecho(tp->t_cc[VREPRINT], tp); (void)ttyoutput('\n', tp); s = spltty(); for (cp = firstc(&tp->t_canq, &c); cp; cp = nextc(&tp->t_canq, cp, &c)) ttyecho(c, tp); for (cp = firstc(&tp->t_rawq, &c); cp; cp = nextc(&tp->t_rawq, cp, &c)) ttyecho(c, tp); CLR(tp->t_state, TS_ERASE); splx(s); tp->t_rocount = tp->t_rawq.c_cc; tp->t_rocol = 0; } /* * Echo a typed character to the terminal. */ static void ttyecho(c, tp) register int c; register struct tty *tp; { if (!ISSET(tp->t_state, TS_CNTTB)) CLR(tp->t_lflag, FLUSHO); if ((!ISSET(tp->t_lflag, ECHO) && (!ISSET(tp->t_lflag, ECHONL) || c != '\n')) || ISSET(tp->t_lflag, EXTPROC)) return; if (((ISSET(tp->t_lflag, ECHOCTL) && (ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n')) || ISSET(c, TTY_CHARMASK) == 0177)) { (void)ttyoutput('^', tp); CLR(c, ~TTY_CHARMASK); if (c == 0177) c = '?'; else c += 'A' - 1; } (void)ttyoutput(c, tp); } /* * Wake up any readers on a tty. */ void ttwakeup(tp) register struct tty *tp; { selwakeup(&tp->t_rsel); if (ISSET(tp->t_state, TS_ASYNC)) pgsignal(tp->t_pgrp, SIGIO, 1); wakeup((caddr_t)&tp->t_rawq); KNOTE(&tp->t_rsel.si_note, 0); } /* * Look up a code for a specified speed in a conversion table; * used by drivers to map software speed values to hardware parameters. */ int ttspeedtab(speed, table) int speed; register struct speedtab *table; { for ( ; table->sp_speed != -1; table++) if (table->sp_speed == speed) return (table->sp_code); return (-1); } /* * Set tty hi and low water marks. * * Try to arrange the dynamics so there's about one second * from hi to low water. */ void ttsetwater(tp) struct tty *tp; { register int cps, x; #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) cps = tp->t_ospeed / 10; tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); x += cps; x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); tp->t_hiwat = roundup(x, CBSIZE); #undef CLAMP } /* * Report on state of foreground process group. */ void ttyinfo(tp) register struct tty *tp; { register struct proc *p, *pick; struct timeval utime, stime; int tmp; if (ttycheckoutq(tp,0) == 0) return; /* Print load average. */ tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); if (tp->t_session == NULL) ttyprintf(tp, "not a controlling terminal\n"); else if (tp->t_pgrp == NULL) ttyprintf(tp, "no foreground process group\n"); else if ((p = tp->t_pgrp->pg_members.lh_first) == 0) ttyprintf(tp, "empty foreground process group\n"); else { /* Pick interesting process. */ for (pick = NULL; p != 0; p = p->p_pglist.le_next) if (proc_compare(pick, p)) pick = p; ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid, pick->p_stat == SRUN ? "running" : pick->p_wmesg ? pick->p_wmesg : "iowait"); calcru(pick, &utime, &stime, NULL); /* Round up and print user time. */ utime.tv_usec += 5000; if (utime.tv_usec >= 1000000) { utime.tv_sec += 1; utime.tv_usec -= 1000000; } ttyprintf(tp, "%ld.%02ldu ", utime.tv_sec, utime.tv_usec / 10000); /* Round up and print system time. */ stime.tv_usec += 5000; if (stime.tv_usec >= 1000000) { stime.tv_sec += 1; stime.tv_usec -= 1000000; } ttyprintf(tp, "%ld.%02lds ", stime.tv_sec, stime.tv_usec / 10000); #define pgtok(a) (((u_long) ((a) * PAGE_SIZE) / 1024)) /* Print percentage cpu, resident set size. */ tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; ttyprintf(tp, "%d%% %ldk\n", tmp / 100, pick->p_stat == SIDL || P_ZOMBIE(pick) ? 0 : vm_resident_count(pick->p_vmspace)); } tp->t_rocount = 0; /* so pending input will be retyped if BS */ } /* * Returns 1 if p2 is "better" than p1 * * The algorithm for picking the "interesting" process is thus: * * 1) Only foreground processes are eligible - implied. * 2) Runnable processes are favored over anything else. The runner * with the highest cpu utilization is picked (p_estcpu). Ties are * broken by picking the highest pid. * 3) The sleeper with the shortest sleep time is next. With ties, * we pick out just "short-term" sleepers (P_SINTR == 0). * 4) Further ties are broken by picking the highest pid. */ #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) #define TESTAB(a, b) ((a)<<1 | (b)) #define ONLYA 2 #define ONLYB 1 #define BOTH 3 static int proc_compare(p1, p2) register struct proc *p1, *p2; { if (p1 == NULL) return (1); /* * see if at least one of them is runnable */ switch (TESTAB(ISRUN(p1), ISRUN(p2))) { case ONLYA: return (0); case ONLYB: return (1); case BOTH: /* * tie - favor one with highest recent cpu utilization */ if (p2->p_estcpu > p1->p_estcpu) return (1); if (p1->p_estcpu > p2->p_estcpu) return (0); return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } /* * weed out zombies */ switch (TESTAB(P_ZOMBIE(p1), P_ZOMBIE(p2))) { case ONLYA: return (1); case ONLYB: return (0); case BOTH: return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } /* * pick the one with the smallest sleep time */ if (p2->p_slptime > p1->p_slptime) return (0); if (p1->p_slptime > p2->p_slptime) return (1); /* * favor one sleeping in a non-interruptible sleep */ if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) return (1); if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) return (0); return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } /* * Output char to tty; console putchar style. */ int tputchar(c, tp) int c; struct tty *tp; { register int s; s = spltty(); if (ISSET(tp->t_state, TS_CARR_ON | TS_ISOPEN) != (TS_CARR_ON | TS_ISOPEN)) { splx(s); return (-1); } if (c == '\n') (void)ttyoutput('\r', tp); (void)ttyoutput(c, tp); ttstart(tp); splx(s); return (0); } /* * Sleep on chan, returning ERESTART if tty changed while we napped and * returning any errors (e.g. EINTR/ETIMEDOUT) reported by tsleep. If * the tty is revoked, restarting a pending call will redo validation done * at the start of the call. */ int ttysleep(tp, chan, pri, wmesg, timo) struct tty *tp; void *chan; int pri, timo; char *wmesg; { int error; short gen; gen = tp->t_gen; if ((error = tsleep(chan, pri, wmesg, timo)) != 0) return (error); return (tp->t_gen == gen ? 0 : ERESTART); } /* * Initialise the global tty list. */ void tty_init() { TAILQ_INIT(&ttylist); tty_count = 0; } /* * Attach a tty to the tty list. * * This should be called ONLY once per real tty (including pty's). * eg, on the sparc, the keyboard and mouse have struct tty's that are * distinctly NOT usable as tty's, and thus should not be attached to * the ttylist. This is why this call is not done from ttymalloc(). * * Device drivers should attach tty's at a similar time that they are * ttymalloc()'ed, or, for the case of statically allocated struct tty's * either in the attach or (first) open routine. */ void tty_attach(tp) struct tty *tp; { TAILQ_INSERT_TAIL(&ttylist, tp, tty_link); ++tty_count; timeout_set(&tp->t_rstrt_to, ttrstrt, tp); } /* * Remove a tty from the tty list. */ void tty_detach(tp) struct tty *tp; { --tty_count; #ifdef DIAGNOSTIC if (tty_count < 0) panic("tty_detach: tty_count < 0"); #endif TAILQ_REMOVE(&ttylist, tp, tty_link); } /* * Allocate a tty structure and its associated buffers. */ struct tty * ttymalloc() { struct tty *tp; MALLOC(tp, struct tty *, sizeof(struct tty), M_TTYS, M_WAITOK); bzero(tp, sizeof *tp); /* XXX: default to 1024 chars for now */ clalloc(&tp->t_rawq, 1024, 1); clalloc(&tp->t_canq, 1024, 1); /* output queue doesn't need quoting */ clalloc(&tp->t_outq, 1024, 0); return(tp); } /* * Free a tty structure and its buffers. * * Be sure to call tty_detach() for any tty that has been * tty_attach()ed. */ void ttyfree(tp) struct tty *tp; { clfree(&tp->t_rawq); clfree(&tp->t_canq); clfree(&tp->t_outq); FREE(tp, M_TTYS); } /* * Return tty-related information. */ int sysctl_tty(name, namelen, oldp, oldlenp, newp, newlen) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; { if (namelen != 1) return (ENOTDIR); switch (name[0]) { case KERN_TTY_TKNIN: return (sysctl_rdquad(oldp, oldlenp, newp, tk_nin)); case KERN_TTY_TKNOUT: return (sysctl_rdquad(oldp, oldlenp, newp, tk_nout)); case KERN_TTY_TKRAWCC: return (sysctl_rdquad(oldp, oldlenp, newp, tk_rawcc)); case KERN_TTY_TKCANCC: return (sysctl_rdquad(oldp, oldlenp, newp, tk_cancc)); default: return (EOPNOTSUPP); } /* NOTREACHED */ }