X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/55e303ae13a4cf49d70f2294092726f2fffb9ef2..21362eb3e66fd2c787aee132bce100a44d71a99c:/bsd/kern/subr_log.c diff --git a/bsd/kern/subr_log.c b/bsd/kern/subr_log.c index bd3e360a2..4f9e8c260 100644 --- a/bsd/kern/subr_log.c +++ b/bsd/kern/subr_log.c @@ -1,16 +1,19 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. + * @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. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * 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 @@ -20,7 +23,7 @@ * Please see the License for the specific language governing rights and * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* @@ -64,14 +67,16 @@ #include #include -#include +#include #include #include #include -#include +#include #include #include +#include #include +#include #define LOG_RDPRI (PZERO + 1) @@ -89,16 +94,21 @@ int log_open; /* also used in log() */ struct msgbuf temp_msgbuf; struct msgbuf *msgbufp; static int _logentrypend = 0; +static int log_inited = 0; +void bsd_log_lock(void); +/* the following two are implemented in osfmk/kern/printf.c */ +extern void bsd_log_unlock(void); +extern void bsd_log_init(void); /* * Serialize log access. Note that the log can be written at interrupt level, * so any log manipulations that can be done from, or affect, another processor * at interrupt level must be guarded with a spin lock. */ -decl_simple_lock_data(,log_lock); /* stop races dead in their tracks */ -#define LOG_LOCK() simple_lock(&log_lock) -#define LOG_UNLOCK() simple_unlock(&log_lock) -#define LOG_LOCK_INIT() simple_lock_init(&log_lock) + +#define LOG_LOCK() bsd_log_lock() +#define LOG_UNLOCK() bsd_log_unlock() + /*ARGSUSED*/ logopen(dev, flags, mode, p) @@ -140,9 +150,7 @@ logclose(dev, flag) LOG_LOCK(); log_open = 0; selwakeup(&logsoftc.sc_selp); - oldpri = splhigh(); selthreadclear(&logsoftc.sc_selp); - splx(oldpri); LOG_UNLOCK(); return (0); } @@ -157,42 +165,57 @@ logread(dev, uio, flag) register long l; register int s; int error = 0; + char localbuff[MSG_BSIZE]; + int copybytes; - s = splhigh(); + LOG_LOCK(); while (msgbufp->msg_bufr == msgbufp->msg_bufx) { if (flag & IO_NDELAY) { - splx(s); - return (EWOULDBLOCK); + error = EWOULDBLOCK; + goto out; } if (logsoftc.sc_state & LOG_NBIO) { - splx(s); - return (EWOULDBLOCK); + error = EWOULDBLOCK; + goto out; } logsoftc.sc_state |= LOG_RDWAIT; + LOG_UNLOCK(); + /* + * If the wakeup is missed the ligtening bolt will wake this up + * if there are any new characters. If that doesn't do it + * then wait for 5 sec and reevaluate + */ if (error = tsleep((caddr_t)msgbufp, LOG_RDPRI | PCATCH, - "klog", 0)) { - splx(s); - return (error); + "klog", 5 * hz)) { + /* if it times out; ignore */ + if (error != EWOULDBLOCK) + return (error); } + LOG_LOCK(); } - splx(s); logsoftc.sc_state &= ~LOG_RDWAIT; - while (uio->uio_resid > 0) { + + while (uio_resid(uio) > 0) { l = msgbufp->msg_bufx - msgbufp->msg_bufr; if (l < 0) l = MSG_BSIZE - msgbufp->msg_bufr; - l = min(l, uio->uio_resid); + l = min(l, uio_resid(uio)); if (l == 0) break; - error = uiomove((caddr_t)&msgbufp->msg_bufc[msgbufp->msg_bufr], + bcopy(&msgbufp->msg_bufc[msgbufp->msg_bufr], &localbuff[0], l); + LOG_UNLOCK(); + error = uiomove((caddr_t)&localbuff[0], (int)l, uio); + LOG_LOCK(); if (error) break; msgbufp->msg_bufr += l; if (msgbufp->msg_bufr < 0 || msgbufp->msg_bufr >= MSG_BSIZE) msgbufp->msg_bufr = 0; } +out: + LOG_UNLOCK(); return (error); } @@ -204,19 +227,19 @@ logselect(dev, rw, wql, p) void * wql; struct proc *p; { - int s = splhigh(); switch (rw) { case FREAD: + LOG_LOCK(); if (msgbufp->msg_bufr != msgbufp->msg_bufx) { - splx(s); + LOG_UNLOCK(); return (1); } selrecord(p, &logsoftc.sc_selp, wql); + LOG_UNLOCK(); break; } - splx(s); return (0); } @@ -227,24 +250,26 @@ logwakeup() int pgid; boolean_t funnel_state; - if (!log_open) + LOG_LOCK(); + if (!log_open) { + LOG_UNLOCK(); return; - funnel_state = thread_funnel_set(kernel_flock, TRUE); + } selwakeup(&logsoftc.sc_selp); if (logsoftc.sc_state & LOG_ASYNC) { - LOG_LOCK(); pgid = logsoftc.sc_pgid; LOG_UNLOCK(); if (pgid < 0) gsignal(-pgid, SIGIO); else if (p = pfind(pgid)) psignal(p, SIGIO); + LOG_LOCK(); } if (logsoftc.sc_state & LOG_RDWAIT) { wakeup((caddr_t)msgbufp); logsoftc.sc_state &= ~LOG_RDWAIT; } - (void) thread_funnel_set(kernel_flock, funnel_state); + LOG_UNLOCK(); } void @@ -265,13 +290,12 @@ logioctl(dev, com, data, flag) long l; int s; + LOG_LOCK(); switch (com) { /* return number of characters immediately available */ case FIONREAD: - s = splhigh(); l = msgbufp->msg_bufx - msgbufp->msg_bufr; - splx(s); if (l < 0) l += MSG_BSIZE; *(off_t *)data = l; @@ -292,28 +316,28 @@ logioctl(dev, com, data, flag) break; case TIOCSPGRP: - LOG_LOCK(); logsoftc.sc_pgid = *(int *)data; - LOG_UNLOCK(); break; case TIOCGPGRP: - LOG_LOCK(); *(int *)data = logsoftc.sc_pgid; - LOG_UNLOCK(); break; default: + LOG_UNLOCK(); return (-1); } + LOG_UNLOCK(); return (0); } void -log_init() +bsd_log_init() { - msgbufp = &temp_msgbuf; - LOG_LOCK_INIT(); + if (!log_inited) { + msgbufp = &temp_msgbuf; + log_inited = 1; + } } void @@ -321,8 +345,10 @@ log_putc(char c) { register struct msgbuf *mbp; - if (msgbufp == NULL) - msgbufp =&temp_msgbuf; + if (!log_inited) { + panic("bsd log is not inited"); + } + LOG_LOCK(); mbp = msgbufp; if (mbp-> msg_magic != MSG_MAGIC) { @@ -337,4 +363,6 @@ log_putc(char c) _logentrypend = 1; if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE) mbp->msg_bufx = 0; + LOG_UNLOCK(); } +