54366c0bd7
option, unbreak the lock tracing release semantic by embedding calls to LOCKSTAT_PROFILE_RELEASE_LOCK() direclty in the inlined version of the releasing functions for mutex, rwlock and sxlock. Failing to do so skips the lockstat_probe_func invokation for unlocking. - As part of the LOCKSTAT support is inlined in mutex operation, for kernel compiled without lock debugging options, potentially every consumer must be compiled including opt_kdtrace.h. Fix this by moving KDTRACE_HOOKS into opt_global.h and remove the dependency by opt_kdtrace.h for all files, as now only KDTRACE_FRAMES is linked there and it is only used as a compile-time stub [0]. [0] immediately shows some new bug as DTRACE-derived support for debug in sfxge is broken and it was never really tested. As it was not including correctly opt_kdtrace.h before it was never enabled so it was kept broken for a while. Fix this by using a protection stub, leaving sfxge driver authors the responsibility for fixing it appropriately [1]. Sponsored by: EMC / Isilon storage division Discussed with: rstone [0] Reported by: rstone [1] Discussed with: philip
333 lines
9.4 KiB
C
333 lines
9.4 KiB
C
/*-
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* Copyright (c) 1994 Christos Zoulas
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* Copyright (c) 1995 Frank van der Linden
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* Copyright (c) 1995 Scott Bartram
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/fcntl.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/linker_set.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/sdt.h>
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#include <sys/syscallsubr.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <machine/stdarg.h>
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#include <compat/linux/linux_util.h>
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#ifdef COMPAT_LINUX32
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#include <machine/../linux32/linux.h>
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#else
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#include <machine/../linux/linux.h>
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#endif
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#include <compat/linux/linux_dtrace.h>
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const char linux_emul_path[] = "/compat/linux";
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/* DTrace init */
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LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
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/**
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* DTrace probes in this module.
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*/
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LIN_SDT_PROBE_DEFINE5(util, linux_emul_convpath, entry, "const char *",
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"enum uio_seg", "char **", "int", "int");
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LIN_SDT_PROBE_DEFINE1(util, linux_emul_convpath, return, "int");
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LIN_SDT_PROBE_DEFINE1(util, linux_msg, entry, "const char *");
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LIN_SDT_PROBE_DEFINE0(util, linux_msg, return);
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LIN_SDT_PROBE_DEFINE2(util, linux_driver_get_name_dev, entry, "device_t",
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"const char *");
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LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_name_dev, nullcall);
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LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_name_dev, return, "char *");
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LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, entry, "char *",
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"int *", "int *");
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LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_major_minor, nullcall);
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LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_major_minor, notfound, "char *");
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LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, return, "int",
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"int", "int");
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LIN_SDT_PROBE_DEFINE0(util, linux_get_char_devices, entry);
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LIN_SDT_PROBE_DEFINE1(util, linux_get_char_devices, return, "char *");
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LIN_SDT_PROBE_DEFINE1(util, linux_free_get_char_devices, entry, "char *");
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LIN_SDT_PROBE_DEFINE0(util, linux_free_get_char_devices, return);
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LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, entry,
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"struct linux_device_handler *");
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LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, return, "int");
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LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, entry,
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"struct linux_device_handler *");
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LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, return, "int");
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/*
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* Search an alternate path before passing pathname arguments on to
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* system calls. Useful for keeping a separate 'emulation tree'.
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*
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* If cflag is set, we check if an attempt can be made to create the
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* named file, i.e. we check if the directory it should be in exists.
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*/
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int
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linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
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char **pbuf, int cflag, int dfd)
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{
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int retval;
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LIN_SDT_PROBE5(util, linux_emul_convpath, entry, path, pathseg, pbuf,
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cflag, dfd);
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retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
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cflag, dfd);
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LIN_SDT_PROBE1(util, linux_emul_convpath, return, retval);
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return (retval);
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}
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void
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linux_msg(const struct thread *td, const char *fmt, ...)
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{
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va_list ap;
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struct proc *p;
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LIN_SDT_PROBE1(util, linux_msg, entry, fmt);
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p = td->td_proc;
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printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
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va_start(ap, fmt);
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vprintf(fmt, ap);
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va_end(ap);
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printf("\n");
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LIN_SDT_PROBE0(util, linux_msg, return);
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}
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struct device_element
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{
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TAILQ_ENTRY(device_element) list;
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struct linux_device_handler entry;
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};
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static TAILQ_HEAD(, device_element) devices =
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TAILQ_HEAD_INITIALIZER(devices);
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static struct linux_device_handler null_handler =
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{ "mem", "mem", "null", "null", 1, 3, 1};
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DATA_SET(linux_device_handler_set, null_handler);
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char *
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linux_driver_get_name_dev(device_t dev)
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{
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struct device_element *de;
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const char *device_name = device_get_name(dev);
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LIN_SDT_PROBE2(util, linux_driver_get_name_dev, entry, dev,
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device_name);
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if (device_name == NULL) {
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LIN_SDT_PROBE0(util, linux_driver_get_name_dev, nullcall);
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LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
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return NULL;
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}
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TAILQ_FOREACH(de, &devices, list) {
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if (strcmp(device_name, de->entry.bsd_driver_name) == 0) {
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LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return,
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de->entry.linux_driver_name);
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return (de->entry.linux_driver_name);
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}
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}
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LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
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return NULL;
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}
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int
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linux_driver_get_major_minor(const char *node, int *major, int *minor)
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{
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struct device_element *de;
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LIN_SDT_PROBE3(util, linux_driver_get_major_minor, entry, node, major,
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minor);
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if (node == NULL || major == NULL || minor == NULL) {
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LIN_SDT_PROBE0(util, linux_driver_get_major_minor, nullcall);
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LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1,
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0, 0);
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return 1;
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}
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if (strlen(node) > strlen("pts/") &&
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strncmp(node, "pts/", strlen("pts/")) == 0) {
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unsigned long devno;
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/*
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* Linux checks major and minors of the slave device
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* to make sure it's a pty device, so let's make him
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* believe it is.
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*/
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devno = strtoul(node + strlen("pts/"), NULL, 10);
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*major = 136 + (devno / 256);
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*minor = devno % 256;
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LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 0,
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*major, *minor);
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return 0;
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}
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TAILQ_FOREACH(de, &devices, list) {
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if (strcmp(node, de->entry.bsd_device_name) == 0) {
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*major = de->entry.linux_major;
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*minor = de->entry.linux_minor;
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LIN_SDT_PROBE3(util, linux_driver_get_major_minor,
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return, 0, *major, *minor);
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return 0;
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}
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}
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LIN_SDT_PROBE1(util, linux_driver_get_major_minor, notfound, node);
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LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1, 0, 0);
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return 1;
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}
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char *
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linux_get_char_devices()
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{
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struct device_element *de;
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char *temp, *string, *last;
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char formated[256];
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int current_size = 0, string_size = 1024;
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LIN_SDT_PROBE0(util, linux_get_char_devices, entry);
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string = malloc(string_size, M_LINUX, M_WAITOK);
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string[0] = '\000';
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last = "";
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TAILQ_FOREACH(de, &devices, list) {
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if (!de->entry.linux_char_device)
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continue;
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temp = string;
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if (strcmp(last, de->entry.bsd_driver_name) != 0) {
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last = de->entry.bsd_driver_name;
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snprintf(formated, sizeof(formated), "%3d %s\n",
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de->entry.linux_major,
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de->entry.linux_device_name);
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if (strlen(formated) + current_size
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>= string_size) {
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string_size *= 2;
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string = malloc(string_size,
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M_LINUX, M_WAITOK);
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bcopy(temp, string, current_size);
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free(temp, M_LINUX);
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}
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strcat(string, formated);
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current_size = strlen(string);
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}
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}
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LIN_SDT_PROBE1(util, linux_get_char_devices, return, string);
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return string;
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}
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void
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linux_free_get_char_devices(char *string)
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{
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LIN_SDT_PROBE1(util, linux_get_char_devices, entry, string);
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free(string, M_LINUX);
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LIN_SDT_PROBE0(util, linux_get_char_devices, return);
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}
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static int linux_major_starting = 200;
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int
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linux_device_register_handler(struct linux_device_handler *d)
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{
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struct device_element *de;
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LIN_SDT_PROBE1(util, linux_device_register_handler, entry, d);
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if (d == NULL) {
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LIN_SDT_PROBE1(util, linux_device_register_handler, return,
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EINVAL);
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return (EINVAL);
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}
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de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
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if (d->linux_major < 0) {
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d->linux_major = linux_major_starting++;
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}
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bcopy(d, &de->entry, sizeof(*d));
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/* Add the element to the list, sorted on span. */
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TAILQ_INSERT_TAIL(&devices, de, list);
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LIN_SDT_PROBE1(util, linux_device_register_handler, return, 0);
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return (0);
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}
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int
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linux_device_unregister_handler(struct linux_device_handler *d)
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{
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struct device_element *de;
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LIN_SDT_PROBE1(util, linux_device_unregister_handler, entry, d);
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if (d == NULL) {
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LIN_SDT_PROBE1(util, linux_device_unregister_handler, return,
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EINVAL);
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return (EINVAL);
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}
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TAILQ_FOREACH(de, &devices, list) {
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if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
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TAILQ_REMOVE(&devices, de, list);
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free(de, M_LINUX);
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LIN_SDT_PROBE1(util, linux_device_unregister_handler,
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return, 0);
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return (0);
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}
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}
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LIN_SDT_PROBE1(util, linux_device_unregister_handler, return, EINVAL);
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return (EINVAL);
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}
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