63a34efe1a
kenv environment in kern_environment.c switches to dynamic kenv. The prior call sets the static variable hintp to the static hints in subr_hints.c (hintmode==0). However, changes to the environment are not detected by the resource_xxx lookups after the change to dynamic kernel environment, so the lookup routines only report the old stuff of hintmode==0, even after the change to the dynamic kenv. This causes kenv users to see a different environment than the kernel routines. This is a problem in the mixer.c code that looks up initial mixer volume settings from the hints: If the hints are dynamic and not from the device.hints file, mixer.c doesn't see them, but kenv does. The patch from the PR (modified to comply to the style of the function) solves this. PR: 83686 Submitted by: Harry Coin <harrycoin@qconline.com>
384 lines
9.0 KiB
C
384 lines
9.0 KiB
C
/*-
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* Copyright (c) 2000,2001 Peter Wemm <peter@FreeBSD.org>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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/*
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* Access functions for device resources.
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*/
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static int checkmethod = 1;
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static int use_kenv;
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static char *hintp;
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/*
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* Evil wildcarding resource string lookup.
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* This walks the supplied env string table and returns a match.
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* The start point can be remembered for incremental searches.
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*/
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static int
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res_find(int *line, int *startln,
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const char *name, int *unit, const char *resname, const char *value,
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const char **ret_name, int *ret_namelen, int *ret_unit,
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const char **ret_resname, int *ret_resnamelen, const char **ret_value)
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{
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int n = 0, hit, i = 0;
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char r_name[32];
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int r_unit;
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char r_resname[32];
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char r_value[128];
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const char *s, *cp;
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char *p;
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if (checkmethod) {
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hintp = NULL;
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switch (hintmode) {
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case 0: /* loader hints in environment only */
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break;
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case 1: /* static hints only */
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hintp = static_hints;
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checkmethod = 0;
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break;
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case 2: /* fallback mode */
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if (dynamic_kenv) {
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sx_slock(&kenv_lock);
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cp = kenvp[0];
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for (i = 0; cp != NULL; cp = kenvp[++i]) {
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if (!strncmp(cp, "hint.", 5)) {
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use_kenv = 1;
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checkmethod = 0;
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break;
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}
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}
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sx_sunlock(&kenv_lock);
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} else {
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cp = kern_envp;
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while (cp) {
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if (strncmp(cp, "hint.", 5) == 0) {
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cp = NULL;
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hintp = kern_envp;
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break;
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}
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while (*cp != '\0')
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cp++;
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cp++;
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if (*cp == '\0') {
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cp = NULL;
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hintp = static_hints;
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break;
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}
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}
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}
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break;
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default:
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break;
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}
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if (hintp == NULL) {
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if (dynamic_kenv) {
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use_kenv = 1;
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checkmethod = 0;
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} else
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hintp = kern_envp;
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}
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}
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if (use_kenv) {
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sx_slock(&kenv_lock);
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i = 0;
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cp = kenvp[0];
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if (cp == NULL) {
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sx_sunlock(&kenv_lock);
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return (ENOENT);
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}
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} else
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cp = hintp;
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while (cp) {
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hit = 1;
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(*line)++;
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if (strncmp(cp, "hint.", 5) != 0)
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hit = 0;
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else
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n = sscanf(cp, "hint.%32[^.].%d.%32[^=]=%128s",
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r_name, &r_unit, r_resname, r_value);
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if (hit && n != 4) {
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printf("CONFIG: invalid hint '%s'\n", cp);
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/* XXX: abuse bogus index() declaration */
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p = index(cp, 'h');
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*p = 'H';
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hit = 0;
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}
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if (hit && startln && *startln >= 0 && *line < *startln)
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hit = 0;
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if (hit && name && strcmp(name, r_name) != 0)
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hit = 0;
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if (hit && unit && *unit != r_unit)
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hit = 0;
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if (hit && resname && strcmp(resname, r_resname) != 0)
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hit = 0;
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if (hit && value && strcmp(value, r_value) != 0)
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hit = 0;
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if (hit)
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break;
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if (use_kenv) {
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cp = kenvp[++i];
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if (cp == NULL)
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break;
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} else {
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while (*cp != '\0')
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cp++;
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cp++;
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if (*cp == '\0') {
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cp = NULL;
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break;
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}
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}
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}
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if (use_kenv)
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sx_sunlock(&kenv_lock);
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if (cp == NULL)
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return ENOENT;
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s = cp;
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/* This is a bit of a hack, but at least is reentrant */
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/* Note that it returns some !unterminated! strings. */
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s = index(s, '.') + 1; /* start of device */
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if (ret_name)
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*ret_name = s;
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s = index(s, '.') + 1; /* start of unit */
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if (ret_namelen && ret_name)
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*ret_namelen = s - *ret_name - 1; /* device length */
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if (ret_unit)
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*ret_unit = r_unit;
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s = index(s, '.') + 1; /* start of resname */
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if (ret_resname)
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*ret_resname = s;
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s = index(s, '=') + 1; /* start of value */
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if (ret_resnamelen && ret_resname)
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*ret_resnamelen = s - *ret_resname - 1; /* value len */
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if (ret_value)
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*ret_value = s;
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if (startln) /* line number for anchor */
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*startln = *line + 1;
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return 0;
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}
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/*
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* Search all the data sources for matches to our query. We look for
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* dynamic hints first as overrides for static or fallback hints.
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*/
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static int
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resource_find(int *line, int *startln,
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const char *name, int *unit, const char *resname, const char *value,
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const char **ret_name, int *ret_namelen, int *ret_unit,
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const char **ret_resname, int *ret_resnamelen, const char **ret_value)
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{
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int i;
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int un;
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*line = 0;
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/* Search for exact unit matches first */
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i = res_find(line, startln, name, unit, resname, value,
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ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
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ret_value);
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if (i == 0)
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return 0;
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if (unit == NULL)
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return ENOENT;
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/* If we are still here, search for wildcard matches */
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un = -1;
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i = res_find(line, startln, name, &un, resname, value,
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ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
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ret_value);
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if (i == 0)
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return 0;
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return ENOENT;
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}
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int
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resource_int_value(const char *name, int unit, const char *resname, int *result)
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{
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int error;
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const char *str;
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char *op;
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unsigned long val;
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int line;
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line = 0;
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error = resource_find(&line, NULL, name, &unit, resname, NULL,
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NULL, NULL, NULL, NULL, NULL, &str);
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if (error)
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return error;
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if (*str == '\0')
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return EFTYPE;
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val = strtoul(str, &op, 0);
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if (*op != '\0')
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return EFTYPE;
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*result = val;
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return 0;
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}
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int
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resource_long_value(const char *name, int unit, const char *resname,
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long *result)
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{
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int error;
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const char *str;
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char *op;
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unsigned long val;
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int line;
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line = 0;
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error = resource_find(&line, NULL, name, &unit, resname, NULL,
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NULL, NULL, NULL, NULL, NULL, &str);
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if (error)
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return error;
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if (*str == '\0')
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return EFTYPE;
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val = strtoul(str, &op, 0);
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if (*op != '\0')
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return EFTYPE;
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*result = val;
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return 0;
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}
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int
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resource_string_value(const char *name, int unit, const char *resname,
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const char **result)
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{
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int error;
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const char *str;
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int line;
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line = 0;
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error = resource_find(&line, NULL, name, &unit, resname, NULL,
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NULL, NULL, NULL, NULL, NULL, &str);
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if (error)
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return error;
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*result = str;
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return 0;
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}
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/*
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* This is a bit nasty, but allows us to not modify the env strings.
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*/
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static const char *
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resource_string_copy(const char *s, int len)
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{
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static char stringbuf[256];
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static int offset = 0;
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const char *ret;
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if (len == 0)
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len = strlen(s);
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if (len > 255)
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return NULL;
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if ((offset + len + 1) > 255)
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offset = 0;
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bcopy(s, &stringbuf[offset], len);
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stringbuf[offset + len] = '\0';
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ret = &stringbuf[offset];
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offset += len + 1;
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return ret;
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}
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/*
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* err = resource_find_match(&anchor, &name, &unit, resname, value)
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* Iteratively fetch a list of devices wired "at" something
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* res and value are restrictions. eg: "at", "scbus0".
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* For practical purposes, res = required, value = optional.
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* *name and *unit are set.
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* set *anchor to zero before starting.
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*/
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int
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resource_find_match(int *anchor, const char **name, int *unit,
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const char *resname, const char *value)
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{
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const char *found_name;
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int found_namelen;
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int found_unit;
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int ret;
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int newln;
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newln = *anchor;
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ret = resource_find(anchor, &newln, NULL, NULL, resname, value,
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&found_name, &found_namelen, &found_unit, NULL, NULL, NULL);
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if (ret == 0) {
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*name = resource_string_copy(found_name, found_namelen);
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*unit = found_unit;
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}
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*anchor = newln;
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return ret;
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}
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/*
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* err = resource_find_dev(&anchor, name, &unit, res, value);
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* Iterate through a list of devices, returning their unit numbers.
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* res and value are optional restrictions. eg: "at", "scbus0".
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* *unit is set to the value.
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* set *anchor to zero before starting.
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*/
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int
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resource_find_dev(int *anchor, const char *name, int *unit,
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const char *resname, const char *value)
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{
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int found_unit;
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int newln;
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int ret;
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newln = *anchor;
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ret = resource_find(anchor, &newln, name, NULL, resname, value,
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NULL, NULL, &found_unit, NULL, NULL, NULL);
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if (ret == 0) {
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*unit = found_unit;
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}
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*anchor = newln;
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return ret;
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}
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/*
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* Check to see if a device is disabled via a disabled hint.
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*/
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int
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resource_disabled(const char *name, int unit)
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{
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int error, value;
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error = resource_int_value(name, unit, "disabled", &value);
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if (error)
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return (0);
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return (value);
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}
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