X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/5d5c5d0d5b79ade9a973d55186ffda2638ba2b6e..c18c124eaa464aaaa5549e99e5a70fc9cbb50944:/bsd/kern/tty.c diff --git a/bsd/kern/tty.c b/bsd/kern/tty.c index 66cace1bb..2586c482f 100644 --- a/bsd/kern/tty.c +++ b/bsd/kern/tty.c @@ -1,33 +1,30 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 1997-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_OSREFERENCE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * This file contains Original Code and/or Modifications of Original Code - * as defined in and that are subject to the Apple Public Source License - * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. The rights granted to you under the - * License may not be used to create, or enable the creation or - * redistribution of, unlawful or unlicensed copies of an Apple operating - * system, or to circumvent, violate, or enable the circumvention or - * violation of, any terms of an Apple operating system software license - * agreement. - * - * Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. - * - * The Original Code and all software distributed under the License are - * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER - * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, - * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. - * Please see the License for the specific language governing rights and + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, + * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and * limitations under the License. - * - * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ -/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */ /*- * Copyright (c) 1982, 1986, 1990, 1991, 1993 * The Regents of the University of California. All rights reserved. @@ -94,13 +91,6 @@ * o Restore TS_WOPEN since it is useful in pstat. It must be cleared * only when _all_ openers leave open(). */ -#ifdef NeXT -#define NSNP 0 -#else -#include "snp.h" -#include "opt_uconsole.h" -#endif - #include #define TTYDEFCHARS 1 #include @@ -111,44 +101,38 @@ #include #include #include -#include +#include #include #include #include #include #include #include -#ifndef NeXT -#include -#endif #include -#if NSNP > 0 -#include -#endif -#ifndef NeXT -#include -#include -#include -#include -#include -#include -#else #include #include -#include -#if 0 /* [ */ -#include -#endif /* 0 ] */ -#endif /* !NeXT */ #include /* averunnable */ -#ifndef NeXT -static int proc_compare(struct proc *p1, struct proc *p2); -#endif /* NeXT */ -static int ttnread(struct tty *tp); +/* + * Debugging assertions for tty locks + */ +#define TTY_DEBUG 1 +#if TTY_DEBUG +#define TTY_LOCK_OWNED(tp) do {lck_mtx_assert(&tp->t_lock, LCK_MTX_ASSERT_OWNED); } while (0) +#define TTY_LOCK_NOTOWNED(tp) do {lck_mtx_assert(&tp->t_lock, LCK_MTX_ASSERT_NOTOWNED); } while (0) +#else +#define TTY_LOCK_OWNED(tp) +#define TTY_LOCK_NOTOWNED(tp) +#endif + +static lck_grp_t *tty_lck_grp; +static lck_grp_attr_t *tty_lck_grp_attr; +static lck_attr_t *tty_lck_attr; + +__private_extern__ int ttnread(struct tty *tp); static void ttyecho(int c, struct tty *tp); -static int ttyoutput(int c, register struct tty *tp); +static int ttyoutput(int c, struct tty *tp); static void ttypend(struct tty *tp); static void ttyretype(struct tty *tp); static void ttyrub(int c, struct tty *tp); @@ -156,7 +140,13 @@ static void ttyrubo(struct tty *tp, int count); static void ttystop(struct tty *tp, int rw); static void ttyunblock(struct tty *tp); static int ttywflush(struct tty *tp); -static int proc_compare(struct proc *p1, struct proc *p2); +static int proc_compare(proc_t p1, proc_t p2); + +static void ttyhold(struct tty *tp); +static void ttydeallocate(struct tty *tp); + +static int isctty(proc_t p, struct tty *tp); +static int isctty_sp(proc_t p, struct tty *tp, struct session *sessp); /* * Table with character classes and parity. The 8th bit indicates parity, @@ -174,6 +164,8 @@ static int proc_compare(struct proc *p1, struct proc *p2); #define CCLASSMASK 0x3f #define CCLASS(c) (char_type[c] & CCLASSMASK) +/* 0b10xxxxxx is the mask for UTF-8 continuations */ +#define CCONT(c) ((c & 0xc0) == 0x80) #define BS BACKSPACE #define CC CONTROL @@ -244,11 +236,8 @@ static u_char const char_type[] = { #define I_HIGH_WATER (TTYHOG - 2 * 256) /* XXX */ #define I_LOW_WATER ((TTYHOG - 2 * 256) * 7 / 8) /* XXX */ -#undef MAX_INPUT /* XXX wrong in */ -#define MAX_INPUT TTYHOG - static void -termios32to64(struct termios *in, struct user_termios *out) +termios32to64(struct termios32 *in, struct user_termios *out) { out->c_iflag = (user_tcflag_t)in->c_iflag; out->c_oflag = (user_tcflag_t)in->c_oflag; @@ -263,7 +252,7 @@ termios32to64(struct termios *in, struct user_termios *out) } static void -termios64to32(struct user_termios *in, struct termios *out) +termios64to32(struct user_termios *in, struct termios32 *out) { out->c_iflag = (tcflag_t)in->c_iflag; out->c_oflag = (tcflag_t)in->c_oflag; @@ -279,19 +268,88 @@ termios64to32(struct user_termios *in, struct termios *out) /* + * tty_init + * + * Initialize the tty line discipline subsystem. + * + * Parameters: void + * + * Returns: void + * + * Locks: No ttys can be allocated and no tty locks can be used + * until after this function is called + * + * Notes: The intent of this is to set up a log group attribute, + * lock group, and loc atribute for subsequent per-tty locks. + * This function is called early in bsd_init(), prior to the + * console device initialization. + */ +void +tty_init(void) +{ + tty_lck_grp_attr = lck_grp_attr_alloc_init(); + tty_lck_grp = lck_grp_alloc_init("tty", tty_lck_grp_attr); + tty_lck_attr = lck_attr_alloc_init(); +} + + +/* + * tty_lock + * + * Lock the requested tty structure. + * + * Parameters: tp The tty we want to lock + * + * Returns: void + * + * Locks: On return, tp is locked + */ +void +tty_lock(struct tty *tp) +{ + TTY_LOCK_NOTOWNED(tp); /* debug assert */ + lck_mtx_lock(&tp->t_lock); +} + + +/* + * tty_unlock + * + * Unlock the requested tty structure. + * + * Parameters: tp The tty we want to unlock + * + * Returns: void + * + * Locks: On return, tp is unlocked + */ +void +tty_unlock(struct tty *tp) +{ + TTY_LOCK_OWNED(tp); /* debug assert */ + lck_mtx_unlock(&tp->t_lock); +} + + +/* + * ttyopen (LDISC) + * * Initial open of tty, or (re)entry to standard tty line discipline. + * + * Locks: Assumes tty_lock() is held prior to calling. */ int -ttyopen(device, tp) - dev_t device; - register struct tty *tp; +ttyopen(dev_t device, struct tty *tp) { - int s; - boolean_t funnel_state; + proc_t p = current_proc(); + struct pgrp *pg, *oldpg; + struct session *sessp, *oldsess; + struct tty *oldtp; + + TTY_LOCK_OWNED(tp); /* debug assert */ - funnel_state = thread_funnel_set(kernel_flock, TRUE); - s = spltty(); tp->t_dev = device; + if (!ISSET(tp->t_state, TS_ISOPEN)) { SET(tp->t_state, TS_ISOPEN); if (ISSET(tp->t_cflag, CLOCAL)) { @@ -299,75 +357,115 @@ ttyopen(device, tp) bzero(&tp->t_winsize, sizeof(tp->t_winsize)); } -#ifndef NeXT + pg = proc_pgrp(p); + sessp = proc_session(p); + /* - * Initialize or restore a cblock allocation policy suitable for - * the standard line discipline. + * First tty open affter setsid() call makes this tty its controlling + * tty, if the tty does not already have a session associated with it. */ - clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); - clist_alloc_cblocks(&tp->t_outq, TTMAXHIWAT + OBUFSIZ + 100, - TTMAXHIWAT + OBUFSIZ + 100); - clist_alloc_cblocks(&tp->t_rawq, TTYHOG, TTYHOG); -#endif /* !NeXT */ - - splx(s); - thread_funnel_set(kernel_flock, funnel_state); + if (SESS_LEADER(p, sessp) && /* the process is the session leader */ + sessp->s_ttyvp == NULL && /* but has no controlling tty */ + tp->t_session == NULL ) { /* and tty not controlling */ + session_lock(sessp); + if ((sessp->s_flags & S_NOCTTY) == 0) { /* and no O_NOCTTY */ + oldtp = sessp->s_ttyp; + ttyhold(tp); + sessp->s_ttyp = tp; + OSBitOrAtomic(P_CONTROLT, &p->p_flag); + session_unlock(sessp); + proc_list_lock(); + oldpg = tp->t_pgrp; + oldsess = tp->t_session; + if (oldsess != SESSION_NULL) + oldsess->s_ttypgrpid = NO_PID; + tp->t_session = sessp; + tp->t_pgrp = pg; + sessp->s_ttypgrpid = pg->pg_id; + proc_list_unlock(); + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + if (oldpg != PGRP_NULL) + pg_rele(oldpg); + if (oldsess != SESSION_NULL) + session_rele(oldsess); + if (NULL != oldtp) + ttyfree(oldtp); + tty_lock(tp); + goto out; + } + session_unlock(sessp); + } + + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + if (sessp != SESSION_NULL) + session_rele(sessp); + if (pg != PGRP_NULL) + pg_rele(pg); + tty_lock(tp); + +out: + + /* XXX may be an error code */ return (0); } /* + * ttyclose + * * 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. * XXX our caller should have done `spltty(); l_close(); ttyclose();' * and l_close() should have flushed, but we repeat the spltty() and * the flush in case there are buggy callers. + * + * Locks: Assumes tty_lock() is held prior to calling. */ int -ttyclose(tp) - register struct tty *tp; +ttyclose(struct tty *tp) { - int s; + struct pgrp * oldpg; + struct session * oldsessp; + + TTY_LOCK_OWNED(tp); /* debug assert */ - s = spltty(); if (constty == tp) { constty = NULL; -splx(s); -spltty(); -#ifdef NeXT /* * Closing current console tty; disable printing of console * messages at bottom-level driver. */ (*cdevsw[major(tp->t_dev)].d_ioctl) (tp->t_dev, KMIOCDISABLCONS, NULL, 0, current_proc()); -#endif /* NeXT */ } ttyflush(tp, FREAD | FWRITE); -#ifndef NeXT - clist_free_cblocks(&tp->t_canq); - clist_free_cblocks(&tp->t_outq); - clist_free_cblocks(&tp->t_rawq); -#endif - -#if NSNP > 0 - if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) - snpdown((struct snoop *)tp->t_sc); -#endif tp->t_gen++; tp->t_line = TTYDISC; + proc_list_lock(); + oldpg = tp->t_pgrp; + oldsessp = tp->t_session; tp->t_pgrp = NULL; tp->t_session = NULL; + if (oldsessp != SESSION_NULL) + oldsessp->s_ttypgrpid = NO_PID; + proc_list_unlock(); + /* drop the reference on prev session and pgrp */ + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + if (oldsessp != SESSION_NULL) + session_rele(oldsessp); + if (oldpg != PGRP_NULL) + pg_rele(oldpg); + tty_lock(tp); tp->t_state = 0; -#if NeXT selthreadclear(&tp->t_wsel); selthreadclear(&tp->t_rsel); -#endif - splx(s); return (0); } @@ -383,19 +481,26 @@ spltty(); (c) != _POSIX_VDISABLE)) /* + * ttyinput (LDISC) + * * Process input of a single character received on a tty. + * + * Parameters: c The character received + * tp The tty on which it was received + * + * Returns: . + * + * Locks: Assumes tty_lock() is held prior to calling. */ int -ttyinput(c, tp) - register int c; - register struct tty *tp; +ttyinput(int c, struct tty *tp) { - register tcflag_t iflag, lflag; - register cc_t *cc; - int i, err, retval; - boolean_t funnel_state; + tcflag_t iflag, lflag; + cc_t *cc; + int i, err; + int retval = 0; /* default return value */ - funnel_state = thread_funnel_set(kernel_flock, TRUE); + TTY_LOCK_OWNED(tp); /* debug assert */ /* * If input is pending take it first. @@ -435,12 +540,14 @@ ttyinput(c, tp) CLR(c, TTY_ERRORMASK); if (ISSET(err, TTY_BI)) { if (ISSET(iflag, IGNBRK)) { - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto out; } if (ISSET(iflag, BRKINT)) { ttyflush(tp, FREAD | FWRITE); - pgsignal(tp->t_pgrp, SIGINT, 1); + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + tty_pgsignal(tp, SIGINT, 1); + tty_lock(tp); goto endcase; } if (ISSET(iflag, PARMRK)) @@ -448,8 +555,7 @@ ttyinput(c, tp) } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) || ISSET(err, TTY_FE)) { if (ISSET(iflag, IGNPAR)) { - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto out; } else if (ISSET(iflag, PARMRK)) { parmrk: @@ -520,15 +626,29 @@ parmrk: if (!ISSET(lflag, NOFLSH)) ttyflush(tp, FREAD | FWRITE); ttyecho(c, tp); - pgsignal(tp->t_pgrp, + /* + * SAFE: All callers drop the lock on return; + * SAFE: if we lose a threaded race on change + * SAFE: of the interrupt character, we could + * SAFE: have lost that race anyway due to the + * SAFE: scheduler executing threads in + * SAFE: priority order rather than "last + * SAFE: active thread" order (FEATURE). + */ + tty_unlock(tp); + tty_pgsignal(tp, CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); + tty_lock(tp); goto endcase; } if (CCEQ(cc[VSUSP], c)) { if (!ISSET(lflag, NOFLSH)) ttyflush(tp, FREAD); ttyecho(c, tp); - pgsignal(tp->t_pgrp, SIGTSTP, 1); + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + tty_pgsignal(tp, SIGTSTP, 1); + tty_lock(tp); goto endcase; } } @@ -540,12 +660,10 @@ parmrk: if (!ISSET(tp->t_state, TS_TTSTOP)) { SET(tp->t_state, TS_TTSTOP); ttystop(tp, 0); - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto out; } if (!CCEQ(cc[VSTART], c)) { - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto out; } /* * if VSTART == VSTOP then toggle @@ -560,8 +678,7 @@ parmrk: */ if (c == '\r') { if (ISSET(iflag, IGNCR)) { - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto out; } else if (ISSET(iflag, ICRNL)) c = '\n'; @@ -577,8 +694,15 @@ parmrk: * erase (^H / ^?) */ if (CCEQ(cc[VERASE], c)) { - if (tp->t_rawq.c_cc) - ttyrub(unputc(&tp->t_rawq), tp); + if (tp->t_rawq.c_cc) { + if (ISSET(iflag, IUTF8)) { + do { + ttyrub((c = unputc(&tp->t_rawq)), tp); + } while(tp->t_rawq.c_cc && CCONT(c)); + } else { + ttyrub(unputc(&tp->t_rawq), tp); + } + } goto endcase; } /* @@ -651,10 +775,14 @@ parmrk: * ^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, ISIG)) { + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + tty_pgsignal(tp, SIGINFO, 1); + tty_lock(tp); + } if (!ISSET(lflag, NOKERNINFO)) - ttyinfo(tp); + ttyinfo_locked(tp); goto endcase; } } @@ -710,37 +838,52 @@ input_overflow: } } } + endcase: /* * IXANY means allow any character to restart output. */ if (ISSET(tp->t_state, TS_TTSTOP) && !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) { - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto out; } + restartoutput: CLR(tp->t_lflag, FLUSHO); CLR(tp->t_state, TS_TTSTOP); + startoutput: - retval = ttstart(tp); - thread_funnel_set(kernel_flock, funnel_state); + /* Start the output */ + retval = ttstart(tp); + +out: return (retval); } + /* + * ttyoutput + * * 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. + * + * Parameters: c The character to output + * tp The tty on which to output on the tty + * + * Returns: < 0 Success + * >= 0 Character to resend (failure) + * + * Locks: Assumes tp is locked on entry, remains locked on exit + * + * Notes: Must be recursive. */ static int -ttyoutput(c, tp) - register int c; - register struct tty *tp; +ttyoutput(int c, struct tty *tp) { - register tcflag_t oflag; - register int col, s; + tcflag_t oflag; + int col; + + TTY_LOCK_OWNED(tp); /* debug assert */ oflag = tp->t_oflag; if (!ISSET(oflag, OPOST)) { @@ -761,16 +904,14 @@ ttyoutput(c, tp) CLR(c, ~TTY_CHARMASK); if (c == '\t' && ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { - c = 8 - (tp->t_column & 7); + col = c = 8 - (tp->t_column & 7); if (!ISSET(tp->t_lflag, FLUSHO)) { - s = spltty(); /* Don't interrupt tabs. */ - c -= b_to_q(" ", c, &tp->t_outq); + c -= b_to_q((const u_char *)" ", c, &tp->t_outq); tk_nout += c; tp->t_outcc += c; - splx(s); } tp->t_column += c; - return (c ? -1 : '\t'); + return (c == col ? -1 : '\t'); } if (c == CEOT && ISSET(oflag, ONOEOT)) return (-1); @@ -785,6 +926,12 @@ ttyoutput(c, tp) if (putc('\r', &tp->t_outq)) return (c); } + /* If OCRNL is set, translate "\r" into "\n". */ + else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) + c = '\n'; + /* If ONOCR is set, don't transmit CRs when on column 0. */ + else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) + return (-1); tk_nout++; tp->t_outcc++; if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) @@ -814,37 +961,147 @@ ttyoutput(c, tp) } /* - * 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. + * Sets the tty state to not allow any more changes of foreground process + * group. This is required to be done so that a subsequent revoke on a vnode + * is able to always successfully complete. + * + * Locks : Assumes tty_lock held on entry + */ +void +ttysetpgrphup(struct tty *tp) +{ + TTY_LOCK_OWNED(tp); /* debug assert */ + SET(tp->t_state, TS_PGRPHUP); +} + +/* + * Locks : Assumes tty lock held on entry + */ +void +ttyclrpgrphup(struct tty *tp) +{ + TTY_LOCK_OWNED(tp); /* debug assert */ + CLR(tp->t_state, TS_PGRPHUP); +} + +/* + * ttioctl + * + * Identical to ttioctl_locked, only the lock is not held + * + * Parameters: + * + * Returns: + * + * Locks: This function assumes the tty_lock() is not held on entry; + * it takes the lock, and releases it before returning. + * + * Notes: This is supported to ensure the line discipline interfaces + * all have the same locking semantics. + * + * This function is called from + */ +int +ttioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, proc_t p) +{ + int retval; + + tty_lock(tp); + retval = ttioctl_locked(tp, cmd, data, flag, p); + tty_unlock(tp); + + return (retval); +} + + +/* + * ttioctl_locked + * + * Ioctls for all tty devices. + * + * Parameters: tp Tty on which ioctl() is being called + * cmd ioctl() command parameter + * data ioctl() data argument (if any) + * flag fileglob open modes from fcntl.h; + * if called internally, this is usually + * set to 0, rather than something useful + * p Process context for the call; if the + * call is proxied to a worker thread, + * this will not be the current process!!! + * + * Returns: 0 Success + * EIO I/O error (no process group, job + * control, etc.) + * EINTR Interrupted by signal + * EBUSY Attempt to become the console while + * the console is busy + * ENOTTY TIOCGPGRP on a non-controlling tty + * EINVAL Invalid baud rate + * ENXIO TIOCSETD of invalid line discipline + * EPERM TIOCSTI, not root, not open for read + * EACCES TIOCSTI, not root, not your controlling + * tty + * EPERM TIOCSCTTY failed + * ENOTTY/EINVAL/EPERM TIOCSPGRP failed + * EPERM TIOCSDRAINWAIT as non-root user + * suser:EPERM Console control denied + * ttywait:EIO t_timeout too small/expired + * ttywait:ERESTART Upper layer must redrive the call; + * this is usually done by the Libc + * stub in user space + * ttywait:EINTR Interrupted (usually a signal) + * ttcompat:EINVAL + * ttcompat:ENOTTY + * ttcompat:EIOCTL + * ttcompat:ENOTTY TIOCGSID, if no session or session + * leader + * ttcompat:ENOTTY All unrecognized ioctls + * *tp->t_param:? TIOCSETA* underlying function + * *linesw[t].l_open:? TIOCSETD line discipline open failure + * + * + * Locks: This function assumes that the tty_lock() is held for the + * tp at the time of the call. The lock remains held on return. + * + * Notes: This function is called after line-discipline specific ioctl + * has been called to do discipline-specific functions and/or + * reject any of these ioctl() commands. + * + * This function calls ttcompat(), which can re-call ttioctl() + * to a depth of one (FORTRAN style mutual recursion); at some + * point, we should just in-line ttcompat() here. */ -/* ARGSUSED */ int -ttioctl(register struct tty *tp, - u_long cmd, caddr_t data, int flag, - struct proc *p) +ttioctl_locked(struct tty *tp, u_long cmd, caddr_t data, int flag, proc_t p) { - int s, error; + int error = 0; struct uthread *ut; + struct pgrp *pg, *oldpg; + struct session *sessp, *oldsessp; + struct tty *oldtp; + + TTY_LOCK_OWNED(tp); /* debug assert */ ut = (struct uthread *)get_bsdthread_info(current_thread()); - /* If the ioctl involves modification, hang if in the background. */ + /* If the ioctl involves modification, signal if in the background. */ switch (cmd) { + case TIOCIXON: + case TIOCIXOFF: + case TIOCDRAIN: case TIOCFLUSH: - case TIOCSETA: + case TIOCSTOP: + case TIOCSTART: + case TIOCSETA_32: case TIOCSETA_64: case TIOCSETD: - case TIOCSETAF: + case TIOCSETAF_32: case TIOCSETAF_64: - case TIOCSETAW: + case TIOCSETAW_32: case TIOCSETAW_64: -#ifdef notdef case TIOCSPGRP: -#endif case TIOCSTAT: case TIOCSTI: case TIOCSWINSZ: -#if COMPAT_43_TTY || defined(COMPAT_SUNOS) case TIOCLBIC: case TIOCLBIS: case TIOCLSET: @@ -853,45 +1110,57 @@ ttioctl(register struct tty *tp, case TIOCSETN: case TIOCSETP: case TIOCSLTC: -#endif while (isbackground(p, tp) && - (p->p_flag & P_PPWAIT) == 0 && + (p->p_lflag & P_LPPWAIT) == 0 && (p->p_sigignore & sigmask(SIGTTOU)) == 0 && (ut->uu_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 | PTTYBLOCK, "ttybg1", - 0); - if (error) - return (error); + pg = proc_pgrp(p); + if (pg == PGRP_NULL) { + error = EIO; + goto out; + } + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + if (pg->pg_jobc == 0) { + pg_rele(pg); + tty_lock(tp); + error = EIO; + goto out; + } + pgsignal(pg, SIGTTOU, 1); + pg_rele(pg); + tty_lock(tp); + + + /* + * We signalled ourself, so we need to act as if we + * have been "interrupted" from a "sleep" to act on + * the signal. If it's a signal that stops the + * process, that's handled in the signal sending code. + */ + error = EINTR; + goto out; } 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; + int flags = *(int *)data; if (flags == 0) flags = FREAD | FWRITE; @@ -900,7 +1169,6 @@ ttioctl(register struct tty *tp, ttyflush(tp, flags); break; } -#ifdef NeXT case TIOCSCONS: { /* Set current console device to this line */ int bogusData = 1; @@ -908,46 +1176,47 @@ ttioctl(register struct tty *tp, /* No break - Fall through to BSD code */ } -#endif /* NeXT */ case TIOCCONS: { /* become virtual console */ if (*(int *)data) { if (constty && constty != tp && ISSET(constty->t_state, TS_CONNECTED)) { - return (EBUSY); + error = EBUSY; + goto out; } -#if defined(NeXT) || !defined(UCONSOLE) - if ( (error = suser(kauth_cred_get(), &p->p_acflag)) ) - return (error); -#endif + if ( (error = suser(kauth_cred_get(), &p->p_acflag)) ) + goto out; constty = tp; } else if (tp == constty) { constty = NULL; } -#ifdef NeXT if (constty) { - (*cdevsw[major(cons.t_dev)].d_ioctl) - (cons.t_dev, KMIOCDISABLCONS, NULL, 0, p); + (*cdevsw[major(constty->t_dev)].d_ioctl) + (constty->t_dev, KMIOCDISABLCONS, NULL, 0, p); } else { (*cdevsw[major(tp->t_dev)].d_ioctl) (tp->t_dev, KMIOCDISABLCONS, NULL, 0, p); } -#endif /* NeXT */ break; } case TIOCDRAIN: /* wait till output drained */ error = ttywait(tp); if (error) - return (error); + goto out; break; - case TIOCGETA: /* get termios struct */ - case TIOCGETA_64: { /* get termios struct */ - if (IS_64BIT_PROCESS(p)) { - termios32to64(&tp->t_termios, (struct user_termios *)data); - } else { - bcopy(&tp->t_termios, data, sizeof(struct termios)); - } + case TIOCGETA_32: /* get termios struct */ +#ifdef __LP64__ + termios64to32((struct user_termios *)&tp->t_termios, (struct termios32 *)data); +#else + bcopy(&tp->t_termios, data, sizeof(struct termios)); +#endif + break; + case TIOCGETA_64: /* get termios struct */ +#ifdef __LP64__ + bcopy(&tp->t_termios, data, sizeof(struct termios)); +#else + termios32to64((struct termios32 *)&tp->t_termios, (struct user_termios *)data); +#endif break; - } case TIOCGETD: /* get line discipline */ *(int *)data = tp->t_line; break; @@ -955,49 +1224,60 @@ ttioctl(register struct tty *tp, *(struct winsize *)data = tp->t_winsize; break; case TIOCGPGRP: /* get pgrp of tty */ - if (!isctty(p, tp)) - return (ENOTTY); + if (!isctty(p, tp)) { + error = ENOTTY; + goto out; + } *(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 TIOCSETA_32: /* set termios struct */ case TIOCSETA_64: - case TIOCSETAW: /* drain output, set */ + case TIOCSETAW_32: /* drain output, set */ case TIOCSETAW_64: - case TIOCSETAF: /* drn out, fls in, set */ - case TIOCSETAF_64: { /* drn out, fls in, set */ - register struct termios *t = (struct termios *)data; + case TIOCSETAF_32: /* drn out, fls in, set */ + case TIOCSETAF_64: + { /* drn out, fls in, set */ + struct termios *t = (struct termios *)data; struct termios lcl_termios; - if (IS_64BIT_PROCESS(p)) { - termios64to32((struct user_termios *)data, &lcl_termios); +#ifdef __LP64__ + if (cmd==TIOCSETA_32 || cmd==TIOCSETAW_32 || cmd==TIOCSETAF_32) { + termios32to64((struct termios32 *)data, (struct user_termios *)&lcl_termios); t = &lcl_termios; } - if (t->c_ispeed < 0 || t->c_ospeed < 0) - return (EINVAL); - s = spltty(); - if (cmd == TIOCSETAW || cmd == TIOCSETAF || +#else + if (cmd==TIOCSETA_64 || cmd==TIOCSETAW_64 || cmd==TIOCSETAF_64) { + termios64to32((struct user_termios *)data, (struct termios32 *)&lcl_termios); + t = &lcl_termios; + } +#endif +#if 0 + /* XXX bogus test; always false */ + if (t->c_ispeed < 0 || t->c_ospeed < 0) { + error = EINVAL; + goto out; + } +#endif /* 0 - leave in; may end up being a conformance issue */ + if (t->c_ispeed == 0) + t->c_ispeed = t->c_ospeed; + if (cmd == TIOCSETAW_32 || cmd == TIOCSETAF_32 || cmd == TIOCSETAW_64 || cmd == TIOCSETAF_64) { error = ttywait(tp); if (error) { - splx(s); - return (error); + goto out; } - if (cmd == TIOCSETAF || cmd == TIOCSETAF_64) + if (cmd == TIOCSETAF_32 || cmd == TIOCSETAF_64) ttyflush(tp, FREAD); } if (!ISSET(t->c_cflag, CIGNORE)) { @@ -1005,8 +1285,7 @@ ttioctl(register struct tty *tp, * Set device hardware. */ if (tp->t_param && (error = (*tp->t_param)(tp, t))) { - splx(s); - return (error); + goto out; } if (ISSET(t->c_cflag, CLOCAL) && !ISSET(tp->t_cflag, CLOCAL)) { @@ -1034,7 +1313,7 @@ ttioctl(register struct tty *tp, ttsetwater(tp); } if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && - cmd != TIOCSETAF && cmd != TIOCSETAF_64) { + cmd != TIOCSETAF_32 && cmd != TIOCSETAF_64) { if (ISSET(t->c_lflag, ICANON)) SET(tp->t_lflag, PENDIN); else { @@ -1044,18 +1323,6 @@ ttioctl(register struct tty *tp, * discipline. Now we have to worry about * panicing for a null queue. */ -#ifndef NeXT - if (tp->t_canq.c_cbreserved > 0 && - tp->t_rawq.c_cbreserved > 0) { - catq(&tp->t_rawq, &tp->t_canq); - /* - * XXX the queue limits may be - * different, so the old queue - * swapping method no longer works. - */ - catq(&tp->t_canq, &tp->t_rawq); - } -#else if (tp->t_rawq.c_cs && tp->t_canq.c_cs) { struct clist tq; @@ -1064,7 +1331,6 @@ ttioctl(register struct tty *tp, tp->t_rawq = tp->t_canq; tp->t_canq = tq; } -#endif /* !NeXT */ CLR(tp->t_lflag, PENDIN); } ttwakeup(tp); @@ -1083,183 +1349,266 @@ ttioctl(register struct tty *tp, t->c_cc[VTIME] != tp->t_cc[VTIME]) ttwakeup(tp); bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); - splx(s); break; } case TIOCSETD: { /* set line discipline */ - register int t = *(int *)data; + int t = *(int *)data; dev_t device = tp->t_dev; - if (t >= nlinesw) - return (ENXIO); + if (t >= nlinesw || t < 0) { + error = ENXIO; + goto out; + } + /* + * If the new line discipline is not equal to the old one, + * close the old one and open the new one. + */ if (t != tp->t_line) { - s = spltty(); (*linesw[tp->t_line].l_close)(tp, flag); error = (*linesw[t].l_open)(device, tp); if (error) { + /* This is racy; it's possible to lose both */ (void)(*linesw[tp->t_line].l_open)(device, tp); - splx(s); - return (error); + goto out; } 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 (suser(kauth_cred_get(), NULL) && (flag & FREAD) == 0) - return (EPERM); - if (suser(kauth_cred_get(), NULL) && !isctty(p, tp)) - return (EACCES); - s = spltty(); + if (suser(kauth_cred_get(), NULL) && (flag & FREAD) == 0) { + error = EPERM; + goto out; + } + if (suser(kauth_cred_get(), NULL) && !isctty(p, tp)) { + error = EACCES; + goto out; + } (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); - splx(s); break; case TIOCSTOP: /* stop output, like ^S */ - s = spltty(); if (!ISSET(tp->t_state, TS_TTSTOP)) { SET(tp->t_state, TS_TTSTOP); ttystop(tp, 0); } - splx(s); + break; + case TIOCIXON: + ttyunblock(tp); + break; + case TIOCIXOFF: + ttyblock(tp); 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); - tp->t_session = p->p_session; - tp->t_pgrp = p->p_pgrp; - p->p_session->s_ttyp = tp; - p->p_flag |= P_CONTROLT; - /* The backgrounded process blocking on tty now - * could be foregound process. Wake such processes - */ - tty_pgsignal(tp->t_pgrp, SIGCONT); + pg = proc_pgrp(p); + sessp = proc_session(p); + if (!SESS_LEADER(p, sessp) || + ((sessp->s_ttyvp || tp->t_session) && + (tp->t_session != sessp))) { + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + if (sessp != SESSION_NULL) + session_rele(sessp); + if (pg != PGRP_NULL) + pg_rele(pg); + tty_lock(tp); + error = EPERM; + goto out; + } + proc_list_lock(); + oldsessp = tp->t_session; + oldpg = tp->t_pgrp; + if (oldsessp != SESSION_NULL) + oldsessp->s_ttypgrpid = NO_PID; + /* do not drop refs on sessp and pg as tp holds them */ + tp->t_session = sessp; + sessp->s_ttypgrpid = pg->pg_id; + tp->t_pgrp = pg; + proc_list_unlock(); + session_lock(sessp); + oldtp = sessp->s_ttyp; + ttyhold(tp); + sessp->s_ttyp = tp; + session_unlock(sessp); + OSBitOrAtomic(P_CONTROLT, &p->p_flag); + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + /* drop the reference on prev session and pgrp */ + if (oldsessp != SESSION_NULL) + session_rele(oldsessp); + if (oldpg != PGRP_NULL) + pg_rele(oldpg); + if (NULL != oldtp) + ttyfree(oldtp); + tty_lock(tp); break; + case TIOCSPGRP: { /* set pgrp of tty */ - register struct pgrp *pgrp = pgfind(*(int *)data); + struct pgrp *pgrp = PGRP_NULL; - if (!isctty(p, tp)) - return (ENOTTY); - else if (pgrp == NULL || pgrp->pg_session != p->p_session) - return (EPERM); - tp->t_pgrp = pgrp; - /* The backgrounded process blocking on tty now - * could be foregound process. Wake such processes + sessp = proc_session(p); + if (!isctty_sp(p, tp, sessp)) { + if (sessp != SESSION_NULL) + session_rele(sessp); + error = ENOTTY; + goto out; + } + else if ((pgrp = pgfind(*(int *)data)) == PGRP_NULL) { + if (sessp != SESSION_NULL) + session_rele(sessp); + error = EINVAL; + goto out; + } else if (pgrp->pg_session != sessp) { + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + if (sessp != SESSION_NULL) + session_rele(sessp); + pg_rele(pgrp); + tty_lock(tp); + error = EPERM; + goto out; + } + /* + * The session leader is going away and is possibly going to revoke + * the terminal, we can't change the process group when that is the + * case. */ - tty_pgsignal(tp->t_pgrp, SIGCONT); + if (ISSET(tp->t_state, TS_PGRPHUP)) { + error = EPERM; + goto out; + } + proc_list_lock(); + oldpg = tp->t_pgrp; + tp->t_pgrp = pgrp; + sessp->s_ttypgrpid = pgrp->pg_id; + proc_list_unlock(); + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + if (oldpg != PGRP_NULL) + pg_rele(oldpg); + if (sessp != SESSION_NULL) + session_rele(sessp); + tty_lock(tp); break; } case TIOCSTAT: /* simulate control-T */ - s = spltty(); - ttyinfo(tp); - splx(s); + ttyinfo_locked(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); + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + tty_pgsignal(tp, SIGWINCH, 1); + tty_lock(tp); } break; case TIOCSDRAINWAIT: error = suser(kauth_cred_get(), &p->p_acflag); - if (error) - return (error); + if (error) { + goto out; + } tp->t_timeout = *(int *)data * hz; wakeup(TSA_OCOMPLETE(tp)); wakeup(TSA_OLOWAT(tp)); break; case TIOCGDRAINWAIT: *(int *)data = tp->t_timeout / hz; - break; + break; default: -#if COMPAT_43_TTY || defined(COMPAT_SUNOS) -#ifdef NeXT - return (ttcompat(tp, cmd, data, flag, p)); -#else - return (ttcompat(tp, cmd, data, flag)); -#endif /* NeXT */ -#else - return (ENOTTY); -#endif + error = ttcompat(tp, cmd, data, flag, p); + goto out; } - return (0); + error = 0; +out: + return(error); } + +/* + * Locks: Assumes tp is locked on entry, remains locked on exit + */ int -ttyselect(tp, rw, wql, p) - struct tty *tp; - int rw; - void * wql; - struct proc *p; +ttyselect(struct tty *tp, int rw, void *wql, proc_t p) { - int s; + int retval = 0; if (tp == NULL) return (ENXIO); - s = spltty(); + TTY_LOCK_OWNED(tp); /* debug assert */ + switch (rw) { case FREAD: - if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) - goto win; + if (ISSET(tp->t_state, TS_ZOMBIE)) { + return(1); + } + + retval = ttnread(tp); + if (retval > 0) { + break; + } + selrecord(p, &tp->t_rsel, wql); break; case FWRITE: - if ((tp->t_outq.c_cc <= tp->t_lowat && - ISSET(tp->t_state, TS_CONNECTED)) - || ISSET(tp->t_state, TS_ZOMBIE)) { -win: splx(s); - return (1); + if (ISSET(tp->t_state, TS_ZOMBIE)) { + return(1); + } + + if ((tp->t_outq.c_cc <= tp->t_lowat) && + ISSET(tp->t_state, TS_CONNECTED)) { + retval = tp->t_hiwat - tp->t_outq.c_cc; + break; } + selrecord(p, &tp->t_wsel, wql); break; } - splx(s); - return (0); + return retval; } + /* * This is a wrapper for compatibility with the select vector used by * cdevsw. It relies on a proper xxxdevtotty routine. + * + * Locks: Assumes tty_lock() is not held prior to calling. */ int -ttselect(dev, rw, wql, p) - dev_t dev; - int rw; - void * wql; - struct proc *p; +ttselect(dev_t dev, int rw, void *wql, proc_t p) { -#ifndef NeXT - return ttyselect((*cdevsw[major(dev)]->d_devtotty)(dev), rw, wql, p); -#else - return ttyselect(cdevsw[major(dev)].d_ttys[minor(dev)], rw, wql, p); -#endif + int rv; + struct tty *tp = cdevsw[major(dev)].d_ttys[minor(dev)]; + + tty_lock(tp); + rv = ttyselect(tp, rw, wql, p); + tty_unlock(tp); + + return (rv); } + /* - * Must be called at spltty(). + * Locks: Assumes tp is locked on entry, remains locked on exit */ -static int -ttnread(tp) - struct tty *tp; +__private_extern__ int +ttnread(struct tty *tp) { int nread; + TTY_LOCK_OWNED(tp); /* debug assert */ + if (ISSET(tp->t_lflag, PENDIN)) ttypend(tp); nread = tp->t_canq.c_cc; @@ -1271,17 +1620,33 @@ ttnread(tp) return (nread); } + /* + * ttywait + * * Wait for output to drain. + * + * Parameters: tp Tty on which to wait for output to drain + * + * Returns: 0 Success + * EIO t_timeout too small/expired + * ttysleep:ERESTART Upper layer must redrive the call; + * this is usually done by the Libc + * stub in user space + * ttysleep:EINTR Interrupted (usually a signal) + * + * Notes: Called from proc_exit() and vproc_exit(). + * + * Locks: Assumes tp is locked on entry, remains locked on exit */ int -ttywait(tp) - register struct tty *tp; +ttywait(struct tty *tp) { - int error, s; + int error; + + TTY_LOCK_OWNED(tp); /* debug assert */ error = 0; - s = spltty(); while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { (*tp->t_oproc)(tp); @@ -1301,33 +1666,34 @@ ttywait(tp) } if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) error = EIO; - splx(s); return (error); } +/* + * Stop the underlying device driver. + * + * Locks: Assumes tty_lock() is held prior to calling. + */ static void -ttystop(tp, rw) - struct tty *tp; - int rw; +ttystop(struct tty *tp, int rw) { -#ifdef sun4c /* XXX */ - (*tp->t_stop)(tp, rw); -#elif defined(NeXT) + TTY_LOCK_OWNED(tp); /* debug assert */ + (*cdevsw[major(tp->t_dev)].d_stop)(tp, rw); -#else - (*cdevsw[major(tp->t_dev)]->d_stop)(tp, rw); -#endif } /* * Flush if successfully wait. + * + * Locks: Assumes tty_lock() is held prior to calling. */ static int -ttywflush(tp) - struct tty *tp; +ttywflush(struct tty *tp) { int error; + TTY_LOCK_OWNED(tp); /* debug assert */ + if ((error = ttywait(tp)) == 0) ttyflush(tp, FREAD); return (error); @@ -1335,15 +1701,14 @@ ttywflush(tp) /* * Flush tty read and/or write queues, notifying anyone waiting. + * + * Locks: Assumes tty_lock() is held prior to calling. */ void -ttyflush(tp, rw) - register struct tty *tp; - int rw; +ttyflush(struct tty *tp, int rw) { - register int s; + TTY_LOCK_OWNED(tp); /* debug assert */ - s = spltty(); #if 0 again: #endif @@ -1401,40 +1766,33 @@ again: FLUSHQ(&tp->t_outq); ttwwakeup(tp); } - splx(s); } /* * Copy in the default termios characters. + * + * Locks: Assumes tty_lock() is held prior to calling. + * + * Notes: No assertion; tp is not in scope. */ void -termioschars(t) - struct termios *t; +termioschars(struct termios *t) { - bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); } -/* - * Old interface. - */ -void -ttychars(tp) - struct tty *tp; -{ - - termioschars(&tp->t_termios); -} /* * Handle input high water. Send stop character for the IXOFF case. Turn * on our input flow control bit and propagate the changes to the driver. * XXX the stop character should be put in a special high priority queue. + * + * Locks: Assumes tty_lock() is held for the call. */ void -ttyblock(tp) - struct tty *tp; +ttyblock(struct tty *tp) { + TTY_LOCK_OWNED(tp); /* debug assert */ SET(tp->t_state, TS_TBLOCK); if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && @@ -1443,15 +1801,18 @@ ttyblock(tp) ttstart(tp); } + /* * Handle input low water. Send start character for the IXOFF case. Turn * off our input flow control bit and propagate the changes to the driver. * XXX the start character should be put in a special high priority queue. + * + * Locks: Assumes tty_lock() is held for the call. */ static void -ttyunblock(tp) - struct tty *tp; +ttyunblock(struct tty *tp) { + TTY_LOCK_OWNED(tp); /* debug assert */ CLR(tp->t_state, TS_TBLOCK); if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && @@ -1460,76 +1821,69 @@ ttyunblock(tp) ttstart(tp); } -#if defined(NeXT) || defined(notyet) -/* FreeBSD: Not used by any current (i386) drivers. */ + /* - * Restart after an inter-char delay. + * ttstart + * + * Start tty output + * + * Parameters: tp tty on which to start output + * + * Returns: 0 Success + * + * Locks: Assumes tty_lock() is held for the call. + * + * Notes: This function might as well be void; it always returns success + * + * Called from ttioctl_locked(), LDISC routines, and + * ttycheckoutq(), ttyblock(), ttyunblock(), and tputchar() */ -void -ttrstrt(tp_arg) - void *tp_arg; -{ - struct tty *tp; - int s; - -#if DIAGNOSTIC - if (tp_arg == NULL) - panic("ttrstrt"); -#endif - tp = tp_arg; - s = spltty(); - - CLR(tp->t_state, TS_TIMEOUT); - ttstart(tp); - - splx(s); -} -#endif /* NeXT || notyet */ - int -ttstart(tp) - struct tty *tp; +ttstart(struct tty *tp) { - boolean_t funnel_state; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); + TTY_LOCK_OWNED(tp); /* debug assert */ if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ (*tp->t_oproc)(tp); - thread_funnel_set(kernel_flock, funnel_state); + return (0); } + /* + * ttylclose (LDISC) + * * "close" a line discipline + * + * Locks: Assumes tty_lock() is held prior to calling. */ int -ttylclose(tp, flag) - struct tty *tp; - int flag; +ttylclose(struct tty *tp, int flag) { - boolean_t funnel_state; + TTY_LOCK_OWNED(tp); /* debug assert */ - funnel_state = thread_funnel_set(kernel_flock, TRUE); if ( (flag & FNONBLOCK) || ttywflush(tp)) ttyflush(tp, FREAD | FWRITE); - thread_funnel_set(kernel_flock, funnel_state); + return (0); } + /* + * ttymodem (LDISC) + * * Handle modem control transition on a tty. * Flag indicates new state of carrier. * Returns 0 if the line should be turned off, otherwise 1. + * + * Locks: Assumes tty_lock() is held prior to calling. */ int -ttymodem(tp, flag) - register struct tty *tp; - int flag; +ttymodem(struct tty *tp, int flag) { - boolean_t funnel_state; + int rval = 1; /* default return value */ - funnel_state = thread_funnel_set(kernel_flock, TRUE); + TTY_LOCK_OWNED(tp); /* debug assert */ if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { /* @@ -1558,8 +1912,8 @@ ttymodem(tp, flag) if (tp->t_session && tp->t_session->s_leader) psignal(tp->t_session->s_leader, SIGHUP); ttyflush(tp, FREAD | FWRITE); - thread_funnel_set(kernel_flock, funnel_state); - return (0); + rval = 0; + goto out; } } else { /* @@ -1572,105 +1926,114 @@ ttymodem(tp, flag) ttwakeup(tp); ttwwakeup(tp); } - thread_funnel_set(kernel_flock, funnel_state); - return (1); + +out: + return (rval); } + /* * Reinput pending characters after state switch * call at spltty(). + * + * Locks: Assumes tty_lock() is held for the call. */ static void -ttypend(tp) - register struct tty *tp; +ttypend(struct tty *tp) { struct clist tq; - register int c; + int c; + + TTY_LOCK_OWNED(tp); /* debug assert */ CLR(tp->t_lflag, PENDIN); SET(tp->t_state, TS_TYPEN); -#ifndef NeXT - /* - * XXX this assumes too much about clist internals. It may even - * fail if the cblock slush pool is empty. We can't allocate more - * cblocks here because we are called from an interrupt handler - * and clist_alloc_cblocks() can wait. - */ - tq = tp->t_rawq; - bzero(&tp->t_rawq, sizeof tp->t_rawq); - tp->t_rawq.c_cbmax = tq.c_cbmax; - tp->t_rawq.c_cbreserved = tq.c_cbreserved; -#else tq = tp->t_rawq; tp->t_rawq.c_cc = 0; - tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0; -#endif /* !NeXT */ + tp->t_rawq.c_cf = tp->t_rawq.c_cl = NULL; while ((c = getc(&tq)) >= 0) ttyinput(c, tp); CLR(tp->t_state, TS_TYPEN); } + /* + * ttread (LDISC) + * * Process a read call on a tty device. + * + * Locks: Assumes tty_lock() is held prior to calling. */ int -ttread(tp, uio, flag) - register struct tty *tp; - struct uio *uio; - int flag; +ttread(struct tty *tp, struct uio *uio, int flag) { - register struct clist *qp; - register int c; - register tcflag_t lflag; - register cc_t *cc = tp->t_cc; - register struct proc *p = current_proc(); - int s, first, error = 0; + struct clist *qp; + int c; + tcflag_t lflag; + cc_t *cc = tp->t_cc; + proc_t p = current_proc(); + int first, error = 0; int has_etime = 0, last_cc = 0; long slp = 0; /* XXX this should be renamed `timo'. */ - boolean_t funnel_state; struct uthread *ut; + struct pgrp * pg; - funnel_state = thread_funnel_set(kernel_flock, TRUE); + TTY_LOCK_OWNED(tp); /* debug assert */ ut = (struct uthread *)get_bsdthread_info(current_thread()); loop: - s = spltty(); lflag = tp->t_lflag; /* * take pending input first */ if (ISSET(lflag, PENDIN)) { ttypend(tp); - splx(s); /* reduce latency */ - s = spltty(); lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ } /* - * Hang process if it's in the background. + * Signal the process if it's in the background. */ if (isbackground(p, tp)) { - splx(s); if ((p->p_sigignore & sigmask(SIGTTIN)) || (ut->uu_sigmask & sigmask(SIGTTIN)) || - p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0) { - thread_funnel_set(kernel_flock, funnel_state); - return (EIO); + p->p_lflag & P_LPPWAIT) { + error = EIO; + goto err; } - pgsignal(p->p_pgrp, SIGTTIN, 1); - error = ttysleep(tp, &lbolt, TTIPRI | PCATCH | PTTYBLOCK, "ttybg2", 0); - if (error){ - thread_funnel_set(kernel_flock, funnel_state); - return (error); + pg = proc_pgrp(p); + if (pg == PGRP_NULL) { + error = EIO; + goto err; } - goto loop; + if (pg->pg_jobc == 0) { + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + pg_rele(pg); + tty_lock(tp); + error = EIO; + goto err; + } + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + pgsignal(pg, SIGTTIN, 1); + pg_rele(pg); + tty_lock(tp); + + /* + * We signalled ourself, so we need to act as if we + * have been "interrupted" from a "sleep" to act on + * the signal. If it's a signal that stops the + * process, that's handled in the signal sending code. + */ + error = EINTR; + goto err; } if (ISSET(tp->t_state, TS_ZOMBIE)) { - splx(s); - thread_funnel_set(kernel_flock, funnel_state); - return (0); /* EOF */ + /* EOF - returning 0 */ + goto err; } /* @@ -1684,19 +2047,17 @@ loop: if (flag & IO_NDELAY) { if (qp->c_cc > 0) goto read; - if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { - splx(s); - thread_funnel_set(kernel_flock, funnel_state); - return (0); + if (ISSET(lflag, ICANON) || cc[VMIN] != 0) { + error = EWOULDBLOCK; } - splx(s); - thread_funnel_set(kernel_flock, funnel_state); - return (EWOULDBLOCK); + /* else polling - returning 0 */ + goto err; } if (!ISSET(lflag, ICANON)) { int m = cc[VMIN]; long t = cc[VTIME]; - struct timeval etime, timecopy; + struct timeval timecopy; + struct timeval etime = {0, 0}; /* protected by !has_etime */ /* * Check each of the four combinations. @@ -1713,9 +2074,7 @@ loop: goto read; /* m, t and qp->c_cc are all 0. 0 is enough input. */ - splx(s); - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto err; } t *= 100000; /* time in us */ #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ @@ -1766,9 +2125,7 @@ loop: } else { if (timercmp(&etime, &timecopy, <=)) { /* Timed out, but 0 is enough input. */ - splx(s); - thread_funnel_set(kernel_flock, funnel_state); - return (0); + goto err; } slp = diff(etime, timecopy); } @@ -1783,7 +2140,7 @@ loop: * is large (divide by `tick' and/or arrange to * use hzto() if hz is large). */ - slp = (long) (((u_long)slp * hz) + 999999) / 1000000; + slp = (long) (((u_int32_t)slp * hz) + 999999) / 1000000; goto sleep; } if (qp->c_cc <= 0) { @@ -1794,12 +2151,10 @@ sleep: error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, ISSET(tp->t_state, TS_CONNECTED) ? "ttyin" : "ttyhup", (int)slp); - splx(s); if (error == EWOULDBLOCK) error = 0; else if (error) { - thread_funnel_set(kernel_flock, funnel_state); - return (error); + goto err; } /* * XXX what happens if another process eats some input @@ -1811,24 +2166,19 @@ sleep: goto loop; } read: - splx(s); /* * Input present, check for input mapping and processing. */ first = 1; -#ifdef NeXT if (ISSET(lflag, ICANON) || (ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) ) -#else - if (ISSET(lflag, ICANON | ISIG)) -#endif goto slowcase; for (;;) { char ibuf[IBUFSIZ]; int icc; - icc = min(uio_resid(uio), IBUFSIZ); - icc = q_to_b(qp, ibuf, icc); + icc = MIN(uio_resid(uio), IBUFSIZ); + icc = q_to_b(qp, (u_char *)ibuf, icc); if (icc <= 0) { if (first) goto loop; @@ -1839,11 +2189,6 @@ read: * XXX if there was an error then we should ungetc() the * unmoved chars and reduce icc here. */ -#if NSNP > 0 - if (ISSET(tp->t_lflag, ECHO) && - ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) - snpin((struct snoop *)tp->t_sc, ibuf, icc); -#endif if (error) break; if (uio_resid(uio) == 0) @@ -1864,10 +2209,17 @@ slowcase: */ if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { - pgsignal(tp->t_pgrp, SIGTSTP, 1); + /* + * SAFE: All callers drop the lock on return and + * SAFE: current thread will not change out from + * SAFE: under us in the "goto loop" case. + */ + tty_unlock(tp); + tty_pgsignal(tp, SIGTSTP, 1); + tty_lock(tp); if (first) { - error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, - "ttybg3", 0); + error = ttysleep(tp, &ttread, TTIPRI | PCATCH, + "ttybg3", hz); if (error) break; goto loop; @@ -1886,15 +2238,6 @@ slowcase: if (error) /* XXX should ungetc(c, qp). */ break; -#if NSNP > 0 - /* - * Only snoop directly on input in echo mode. Non-echoed - * input will be snooped later iff the application echoes it. - */ - if (ISSET(tp->t_lflag, ECHO) && - ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) - snpinc((struct snoop *)tp->t_sc, (char)c); -#endif if (uio_resid(uio) == 0) break; /* @@ -1911,36 +2254,38 @@ out: * Look to unblock input now that (presumably) * the input queue has gone down. */ - s = spltty(); if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc + tp->t_canq.c_cc <= I_LOW_WATER) ttyunblock(tp); - splx(s); - thread_funnel_set(kernel_flock, funnel_state); +err: return (error); } + /* * 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. + * + * Locks: Assumes tty_lock() is held before calling + * + * Notes: This function is called from tprintf() in subr_prf.c */ int -ttycheckoutq(tp, wait) - register struct tty *tp; - int wait; +ttycheckoutq(struct tty *tp, int wait) { - int hiwat, s; + int hiwat; sigset_t oldsig; struct uthread *ut; + TTY_LOCK_OWNED(tp); /* debug assert */ + ut = (struct uthread *)get_bsdthread_info(current_thread()); hiwat = tp->t_hiwat; - s = spltty(); oldsig = wait ? ut->uu_siglist : 0; if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) while (tp->t_outq.c_cc > hiwat) { @@ -1948,80 +2293,93 @@ ttycheckoutq(tp, wait) if (tp->t_outq.c_cc <= hiwat) break; if (wait == 0 || ut->uu_siglist != oldsig) { - splx(s); return (0); } SET(tp->t_state, TS_SO_OLOWAT); - tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); + ttysleep(tp, TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); } - splx(s); return (1); } + /* + * ttwrite (LDISC) + * * Process a write call on a tty device. + * + * Locks: Assumes tty_lock() is held prior to calling. */ int -ttwrite(tp, uio, flag) - register struct tty *tp; - register struct uio *uio; - int flag; +ttwrite(struct tty *tp, struct uio *uio, int flag) { - register char *cp = NULL; - register int cc, ce; - register struct proc *p; - int i, hiwat, count, error, s; + char *cp = NULL; + int cc, ce; + proc_t p; + int i, hiwat, error; + user_ssize_t count; char obuf[OBUFSIZ]; - boolean_t funnel_state; struct uthread *ut; + struct pgrp * pg; - funnel_state = thread_funnel_set(kernel_flock, TRUE); + TTY_LOCK_OWNED(tp); /* debug assert */ ut = (struct uthread *)get_bsdthread_info(current_thread()); hiwat = tp->t_hiwat; - // LP64todo - fix this! count = uio_resid(uio); error = 0; cc = 0; loop: - s = spltty(); if (ISSET(tp->t_state, TS_ZOMBIE)) { - splx(s); if (uio_resid(uio) == count) error = EIO; goto out; } if (!ISSET(tp->t_state, TS_CONNECTED)) { if (flag & IO_NDELAY) { - splx(s); error = EWOULDBLOCK; goto out; } error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0); - splx(s); if (error) { goto out; } goto loop; } - splx(s); /* - * Hang the process if it's in the background. + * Signal the process if it's in the background. */ p = current_proc(); if (isbackground(p, tp) && - ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 && + ISSET(tp->t_lflag, TOSTOP) && (p->p_lflag & P_LPPWAIT) == 0 && (p->p_sigignore & sigmask(SIGTTOU)) == 0 && (ut->uu_sigmask & sigmask(SIGTTOU)) == 0) { - if (p->p_pgrp->pg_jobc == 0) { + + pg = proc_pgrp(p); + if (pg == PGRP_NULL) { error = EIO; goto out; } - pgsignal(p->p_pgrp, SIGTTOU, 1); - error = ttysleep(tp, &lbolt, TTIPRI | PCATCH | PTTYBLOCK, "ttybg4", 0); - if (error) + if (pg->pg_jobc == 0) { + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + pg_rele(pg); + tty_lock(tp); + error = EIO; + goto out; + } + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + pgsignal(pg, SIGTTOU, 1); + pg_rele(pg); + tty_lock(tp); + /* + * We signalled ourself, so we need to act as if we + * have been "interrupted" from a "sleep" to act on + * the signal. If it's a signal that stops the + * process, that's handled in the signal sending code. + */ + error = EINTR; goto out; - goto loop; } /* * Process the user's data in at most OBUFSIZ chunks. Perform any @@ -2031,7 +2389,6 @@ loop: while (uio_resid(uio) > 0 || cc > 0) { if (ISSET(tp->t_lflag, FLUSHO)) { uio_setresid(uio, 0); - thread_funnel_set(kernel_flock, funnel_state); return (0); } if (tp->t_outq.c_cc > hiwat) @@ -2041,17 +2398,13 @@ loop: * leftover from last time. */ if (cc == 0) { - cc = min(uio_resid(uio), OBUFSIZ); + cc = MIN(uio_resid(uio), OBUFSIZ); cp = obuf; error = uiomove(cp, cc, uio); if (error) { cc = 0; break; } -#if NSNP > 0 - if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) - snpin((struct snoop *)tp->t_sc, cp, cc); -#endif } /* * If nothing fancy need be done, grab those characters we @@ -2075,23 +2428,8 @@ loop: if (ce == 0) { tp->t_rocount = 0; if (ttyoutput(*cp, tp) >= 0) { -#ifdef NeXT /* out of space */ goto overfull; -#else - /* No Clists, wait a bit. */ - ttstart(tp); - if (flag & IO_NDELAY) { - error = EWOULDBLOCK; - goto out; - } - error = ttysleep(tp, &lbolt, - TTOPRI|PCATCH, - "ttybf1", 0); - if (error) - goto out; - goto loop; -#endif /* NeXT */ } cp++; cc--; @@ -2110,28 +2448,14 @@ loop: * requiring special handling by ttyoutput. */ tp->t_rocount = 0; - i = b_to_q(cp, ce, &tp->t_outq); + i = b_to_q((u_char *)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) { -#ifdef NeXT /* out of space */ goto overfull; -#else - /* No Clists, wait a bit. */ - ttstart(tp); - if (flag & IO_NDELAY) { - error = EWOULDBLOCK; - goto out; - } - error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, - "ttybf2", 0); - if (error) - goto out; - goto loop; -#endif /* NeXT */ } if (ISSET(tp->t_lflag, FLUSHO) || tp->t_outq.c_cc > hiwat) @@ -2146,10 +2470,8 @@ out: * (the call will either return short or restart with a new uio). */ uio_setresid(uio, (uio_resid(uio) + cc)); - thread_funnel_set(kernel_flock, funnel_state); return (error); -#ifdef NeXT overfull: /* @@ -2159,29 +2481,23 @@ overfull: * proceed as normal. */ hiwat = tp->t_outq.c_cc - 1; -#endif 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_setresid(uio, (uio_resid(uio) + cc)); - thread_funnel_set(kernel_flock, funnel_state); return (uio_resid(uio) == count ? EWOULDBLOCK : 0); } SET(tp->t_state, TS_SO_OLOWAT); error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", tp->t_timeout); - splx(s); if (error == EWOULDBLOCK) error = EIO; if (error) @@ -2189,18 +2505,21 @@ ovhiwat: goto loop; } + /* * Rubout one character from the rawq of tp * as cleanly as possible. + * + * Locks: Assumes tty_lock() is held prior to calling. */ static void -ttyrub(c, tp) - register int c; - register struct tty *tp; +ttyrub(int c, struct tty *tp) { - register u_char *cp; - register int savecol; - int tabc, s; + u_char *cp; + int savecol; + int tabc; + + TTY_LOCK_OWNED(tp); /* debug assert */ if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) return; @@ -2219,7 +2538,9 @@ ttyrub(c, tp) CLR(c, ~TTY_CHARMASK); switch (CCLASS(c)) { case ORDINARY: - ttyrubo(tp, 1); + if(!(ISSET(tp->t_iflag, IUTF8) && CCONT(c))) { + ttyrubo(tp, 1); + } break; case BACKSPACE: case CONTROL: @@ -2234,25 +2555,15 @@ ttyrub(c, tp) 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; -#ifndef NeXT - cp = tp->t_rawq.c_cf; - if (cp) - tabc = *cp; /* XXX FIX NEXTC */ - for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) - ttyecho(tabc, tp); -#else for (cp = firstc(&tp->t_rawq, &tabc); cp; cp = nextc(&tp->t_rawq, cp, &tabc)) ttyecho(tabc, tp); -#endif /* !NeXT */ 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; @@ -2264,7 +2575,7 @@ ttyrub(c, tp) break; default: /* XXX */ #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" - (void)printf(PANICSTR, c, CCLASS(c)); + printf(PANICSTR, c, CCLASS(c)); #ifdef notdef panic(PANICSTR, c, CCLASS(c)); #endif @@ -2281,12 +2592,16 @@ ttyrub(c, tp) --tp->t_rocount; } + /* * Back over count characters, erasing them. + * + * Locks: Assumes tty_lock() is held prior to calling. */ static void ttyrubo(struct tty *tp, int count) { + TTY_LOCK_OWNED(tp); /* debug assert */ while (count-- > 0) { (void)ttyoutput('\b', tp); @@ -2295,17 +2610,21 @@ ttyrubo(struct tty *tp, int count) } } + /* * ttyretype -- * Reprint the rawq line. Note, it is assumed that c_cc has already * been checked. + * + * Locks: Assumes tty_lock() is held prior to calling. */ static void -ttyretype(tp) - register struct tty *tp; +ttyretype(struct tty *tp) { - register u_char *cp; - int s, c; + u_char *cp; + int c; + + TTY_LOCK_OWNED(tp); /* debug assert */ /* Echo the reprint character. */ if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) @@ -2318,35 +2637,26 @@ ttyretype(tp) * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE * BIT OF FIRST CHAR. */ - s = spltty(); -#ifndef NeXT - for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); - cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) - ttyecho(c, tp); - for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); - cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) - ttyecho(c, tp); -#else NeXT 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); -#endif /* !NeXT */ 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. + * + * Locks: Assumes tty_lock() is held prior to calling. */ static void -ttyecho(c, tp) - register int c; - register struct tty *tp; +ttyecho(int c, struct tty *tp) { + TTY_LOCK_OWNED(tp); /* debug assert */ if (!ISSET(tp->t_state, TS_CNTTB)) CLR(tp->t_lflag, FLUSHO); @@ -2367,36 +2677,52 @@ ttyecho(c, tp) (void)ttyoutput(c, tp); } + /* * Wake up any readers on a tty. + * + * Locks: Assumes tty_lock() is held for the call. */ void -ttwakeup(tp) - register struct tty *tp; +ttwakeup(struct tty *tp) { + TTY_LOCK_OWNED(tp); /* debug assert */ -#ifndef NeXT - if (tp->t_rsel.si_pid != 0) -#endif - selwakeup(&tp->t_rsel); - if (ISSET(tp->t_state, TS_ASYNC)) - pgsignal(tp->t_pgrp, SIGIO, 1); + selwakeup(&tp->t_rsel); + KNOTE(&tp->t_rsel.si_note, 1); + if (ISSET(tp->t_state, TS_ASYNC)) { + /* + * XXX: Callers may not revalidate it the tty is closed + * XXX: out from under them by another thread, but we do + * XXX: not support queued signals. This should be safe, + * XXX: since the process we intend to wakeup is in the + * XXX: process group, and will wake up because of the + * XXX: signal anyway. + */ + tty_unlock(tp); + tty_pgsignal(tp, SIGIO, 1); + tty_lock(tp); + } wakeup(TSA_HUP_OR_INPUT(tp)); } + /* + * ttwwakeup (LDISC) + * * Wake up any writers on a tty. + * + * Locks: Assumes tty_lock() is held prior to calling. */ void -ttwwakeup(tp) - register struct tty *tp; +ttwwakeup(struct tty *tp) { -#ifndef NeXT - if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_lowat) -#else - if (tp->t_outq.c_cc <= tp->t_lowat) -#endif + TTY_LOCK_OWNED(tp); /* debug assert */ + + if (tp->t_outq.c_cc <= tp->t_lowat) { selwakeup(&tp->t_wsel); + KNOTE(&tp->t_wsel.si_note, 1); + } if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { CLR(tp->t_state, TS_SO_OCOMPLETE); @@ -2409,28 +2735,31 @@ ttwwakeup(tp) } } + /* * Look up a code for a specified speed in a conversion table; * used by drivers to map software speed values to hardware parameters. + * + * Notes: No locks are assumed for this function; it does not + * directly access struct tty. */ int -ttspeedtab(speed, table) - int speed; - register struct speedtab *table; +ttspeedtab(int speed, 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. * + * Locks: Assumes tty_lock() is held prior to calling. */ void ttsetwater(struct tty *tp) @@ -2438,6 +2767,8 @@ ttsetwater(struct tty *tp) int cps; unsigned int x; + TTY_LOCK_OWNED(tp); /* debug assert */ + #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) cps = tp->t_ospeed / 10; @@ -2448,7 +2779,7 @@ ttsetwater(struct tty *tp) #undef CLAMP } -/* NeXT ttyinfo has been converted to the MACH kernel */ +/* ttyinfo has been converted to the MACH kernel */ #include /* XXX Should be in Mach header , but doesn't work */ @@ -2457,22 +2788,29 @@ extern kern_return_t thread_info_internal(thread_t thread, thread_info_t thread_info_out, mach_msg_type_number_t *thread_info_count); + /* * Report on state of foreground process group. + * + * Locks: Assumes tty_lock() is held prior to calling. */ void -ttyinfo(struct tty *tp) +ttyinfo_locked(struct tty *tp) { int load; thread_t thread; uthread_t uthread; - struct proc *p; - struct proc *pick; + proc_t p; + proc_t pick; + pid_t pickpid; const char *state; struct timeval utime; struct timeval stime; thread_basic_info_data_t basic_info; mach_msg_type_number_t mmtn = THREAD_BASIC_INFO_COUNT; + struct pgrp * pg; + + TTY_LOCK_OWNED(tp); /* debug assert */ if (ttycheckoutq(tp,0) == 0) return; @@ -2496,6 +2834,7 @@ ttyinfo(struct tty *tp) return; } /* first process in process group */ + /* XXX is there a need for pgrp lock ? */ if ((p = tp->t_pgrp->pg_members.lh_first) == NULL) { ttyprintf(tp, "empty foreground process group\n"); tp->t_rocount = 0; @@ -2506,17 +2845,34 @@ ttyinfo(struct tty *tp) * Pick the most interesting process and copy some of its * state for printing later. */ + pg = proc_pgrp(p); + pgrp_lock(pg); + /* the proc_compare is non blocking fn, no need to use iterator */ for (pick = NULL; p != NULL; p = p->p_pglist.le_next) { - if (proc_compare(pick, p)) + if (proc_compare(pick, p)) { pick = p; + pickpid = p->p_pid; + } else { + pickpid = pick->p_pid; + } } + pgrp_unlock(pg); + /* SAFE: All callers drop the lock on return */ + tty_unlock(tp); + pg_rele(pg); + tty_lock(tp); + + pick = proc_find(pickpid); + if (pick == PROC_NULL) + return; if (TAILQ_EMPTY(&pick->p_uthlist) || (uthread = TAILQ_FIRST(&pick->p_uthlist)) == NULL || - (thread = uthread->uu_act) == NULL || + (thread = vfs_context_thread(&uthread->uu_context)) == NULL || (thread_info_internal(thread, THREAD_BASIC_INFO, (thread_info_t)&basic_info, &mmtn) != KERN_SUCCESS)) { ttyprintf(tp, "foreground process without thread\n"); tp->t_rocount = 0; + proc_rele(pick); return; } @@ -2541,9 +2897,10 @@ ttyinfo(struct tty *tp) break; } calcru(pick, &utime, &stime, NULL); + proc_rele(pick); /* Print command, pid, state, utime, and stime */ - ttyprintf(tp, " cmd: %s %d %s %ld.%02ldu %ld.%02lds\n", + ttyprintf(tp, " cmd: %s %d %s %ld.%02du %ld.%02ds\n", pick->p_comm, pick->p_pid, state, @@ -2552,6 +2909,7 @@ ttyinfo(struct tty *tp) tp->t_rocount = 0; } + /* * Returns 1 if p2 is "better" than p1 * @@ -2570,10 +2928,15 @@ ttyinfo(struct tty *tp) #define ONLYB 1 #define BOTH 3 +/* + * Locks: pgrp_lock(p2) held on call to this function + * tty_lock(tp) for p2's tty, for which p2 is the foreground + * process, held on call to this function + */ static int -proc_compare(p1, p2) - register struct proc *p1, *p2; +proc_compare(proc_t p1, proc_t p2) { + /* NOTE THIS FN needs to be NON BLOCKING */ if (p1 == NULL) return (1); @@ -2589,10 +2952,13 @@ proc_compare(p1, p2) /* * tie - favor one with highest recent cpu utilization */ +#ifdef _PROC_HAS_SCHEDINFO_ + /* Without the support the fields are always zero */ if (p2->p_estcpu > p1->p_estcpu) return (1); if (p1->p_estcpu > p2->p_estcpu) return (0); +#endif /* _PROC_HAS_SCHEDINFO_ */ return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } /* @@ -2609,39 +2975,66 @@ proc_compare(p1, p2) /* * pick the one with the smallest sleep time */ +#ifdef _PROC_HAS_SCHEDINFO_ + /* Without the support the fields are always zero */ if (p2->p_slptime > p1->p_slptime) return (0); if (p1->p_slptime > p2->p_slptime) return (1); +#endif /* _PROC_HAS_SCHEDINFO_ */ return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ } + /* * Output char to tty; console putchar style. + * + * Locks: Assumes tty_lock() is held prior to calling. + * + * Notes: Only ever called from putchar() in subr_prf.c */ int -tputchar(c, tp) - int c; - struct tty *tp; +tputchar(int c, struct tty *tp) { - register int s; + TTY_LOCK_OWNED(tp); /* debug assert */ - s = spltty(); if (!ISSET(tp->t_state, TS_CONNECTED)) { - splx(s); return (-1); } if (c == '\n') (void)ttyoutput('\r', tp); (void)ttyoutput(c, tp); ttstart(tp); - splx(s); return (0); } + /* + * ttysleep + * + * Sleep on a wait channel waiting for an interrupt or a condition to come + * true so that we are woken up. + * + * Parameters: tp Tty going to sleep + * chan The sleep channel (usually an address + * of a structure member) + * pri priority and flags + * wmesg Wait message; shows up in debugger, + * should show up in "ps", but doesn't + * timo Timeout for the sleep + * + * Returns: 0 Condition came true + * ERESTART Upper layer must redrive the call; + * this is usually done by the Libc + * stub in user space + * msleep0:EINTR Interrupted (usually a signal) + * msleep0:ERESTART Interrupted (usually a masked signal) + * msleep0:EWOULDBLOCK Timeout (timo) already expired + * + * Locks: Assumes tty_lock() is held prior to calling. + * * Sleep on chan, returning ERESTART if tty changed while we napped and - * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If + * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by msleep0. If * the tty is revoked, restarting a pending call will redo validation done * at the start of the call. */ @@ -2651,16 +3044,27 @@ ttysleep(struct tty *tp, void *chan, int pri, const char *wmesg, int timo) int error; int gen; + TTY_LOCK_OWNED(tp); + gen = tp->t_gen; - error = tsleep(chan, pri, wmesg, timo); + /* Use of msleep0() avoids conversion timo/timespec/timo */ + error = msleep0(chan, &tp->t_lock, pri, wmesg, timo, (int (*)(int))0); if (error) return (error); return (tp->t_gen == gen ? 0 : ERESTART); } -#ifdef NeXT + /* * Allocate a tty structure and its associated buffers. + * + * Parameters: void + * + * Returns: !NULL Address of new struct tty + * NULL Error ("ENOMEM") + * + * Locks: The tty_lock() of the returned tty is not held when it + * is returned. */ struct tty * ttymalloc(void) @@ -2674,54 +3078,94 @@ ttymalloc(void) clalloc(&tp->t_canq, TTYCLSIZE, 1); /* output queue doesn't need quoting */ clalloc(&tp->t_outq, TTYCLSIZE, 0); + lck_mtx_init(&tp->t_lock, tty_lck_grp, tty_lck_attr); + klist_init(&tp->t_rsel.si_note); + klist_init(&tp->t_wsel.si_note); + tp->t_refcnt = 1; } - return(tp); + return (tp); +} + +/* + * Increment the reference count on a tty. + */ +static void +ttyhold(struct tty *tp) +{ + TTY_LOCK_OWNED(tp); + tp->t_refcnt++; } /* - * Free a tty structure and its buffers. + * Drops a reference count on a tty structure; if the reference count reaches + * zero, then also frees the structure and associated buffers. */ void -ttyfree(tp) -struct tty *tp; +ttyfree(struct tty *tp) +{ + TTY_LOCK_NOTOWNED(tp); + + tty_lock(tp); + if (--tp->t_refcnt == 0) { + tty_unlock(tp); + ttydeallocate(tp); + } else if (tp->t_refcnt < 0) { + panic("%s: freeing free tty %p", __func__, tp); + } else + tty_unlock(tp); +} + +/* + * Deallocate a tty structure and its buffers. + * + * Locks: The tty_lock() is assumed to not be held at the time of + * the free; this function destroys the mutex. + */ +static void +ttydeallocate(struct tty *tp) { + TTY_LOCK_NOTOWNED(tp); /* debug assert */ + +#if DEBUG + if (!(SLIST_EMPTY(&tp->t_rsel.si_note) && SLIST_EMPTY(&tp->t_wsel.si_note))) { + panic("knotes hooked into a tty when the tty is freed.\n"); + } +#endif /* DEBUG */ + clfree(&tp->t_rawq); clfree(&tp->t_canq); clfree(&tp->t_outq); + lck_mtx_destroy(&tp->t_lock, tty_lck_grp); FREE(tp, M_TTYS); } -#else /* !NeXT */ -#ifdef notyet -/* - * XXX this is usable not useful or used. Most tty drivers have - * ifdefs for using ttymalloc() but assume a different interface. - */ /* - * Allocate a tty struct. Clists in the struct will be allocated by - * ttyopen(). + * Locks: Assumes tty_lock() is held prior to calling. */ -struct tty * -ttymalloc() +int +isbackground(proc_t p, struct tty *tp) { - struct tty *tp; + TTY_LOCK_OWNED(tp); - MALLOC(tp, struct tty *, sizeof *tp, M_TTYS, M_WAITOK|M_ZERO); - return (tp); + return (tp->t_session != NULL && p->p_pgrp != NULL && (p->p_pgrp != tp->t_pgrp) && isctty_sp(p, tp, p->p_pgrp->pg_session)); } -#endif -#if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */ -/* - * Free a tty struct. Clists in the struct should have been freed by - * ttyclose(). - */ -void -ttyfree(tp) - struct tty *tp; +static int +isctty(proc_t p, struct tty *tp) { - FREE(tp, M_TTYS); + int retval; + struct session * sessp; + + sessp = proc_session(p); + retval = (sessp == tp->t_session && p->p_flag & P_CONTROLT); + session_rele(sessp); + return(retval); +} + +static int +isctty_sp(proc_t p, struct tty *tp, struct session *sessp) +{ + return(sessp == tp->t_session && p->p_flag & P_CONTROLT); + } -#endif /* 0 */ -#endif /* NeXT */