| Current Path : /sys/boot/common/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/boot/common/module.c |
/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/boot/common/module.c 220332 2011-04-04 16:59:46Z marcel $");
/*
* file/module function dispatcher, support, etc.
*/
#include <stand.h>
#include <string.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/queue.h>
#include "bootstrap.h"
#define MDIR_REMOVED 0x0001
#define MDIR_NOHINTS 0x0002
struct moduledir {
char *d_path; /* path of modules directory */
u_char *d_hints; /* content of linker.hints file */
int d_hintsz; /* size of hints data */
int d_flags;
STAILQ_ENTRY(moduledir) d_link;
};
static int file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
static int file_loadraw(char *type, char *name);
static int file_load_dependencies(struct preloaded_file *base_mod);
static char * file_search(const char *name, char **extlist);
static struct kernel_module * file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
static int file_havepath(const char *name);
static char *mod_searchmodule(char *name, struct mod_depend *verinfo);
static void file_insert_tail(struct preloaded_file *mp);
struct file_metadata* metadata_next(struct file_metadata *base_mp, int type);
static void moduledir_readhints(struct moduledir *mdp);
static void moduledir_rebuild(void);
/* load address should be tweaked by first module loaded (kernel) */
static vm_offset_t loadaddr = 0;
static const char *default_searchpath ="/boot/kernel;/boot/modules";
static STAILQ_HEAD(, moduledir) moduledir_list = STAILQ_HEAD_INITIALIZER(moduledir_list);
struct preloaded_file *preloaded_files = NULL;
static char *kld_ext_list[] = {
".ko",
"",
".debug",
NULL
};
/*
* load an object, either a disk file or code module.
*
* To load a file, the syntax is:
*
* load -t <type> <path>
*
* code modules are loaded as:
*
* load <path> <options>
*/
COMMAND_SET(load, "load", "load a kernel or module", command_load);
static int
command_load(int argc, char *argv[])
{
char *typestr;
int dofile, dokld, ch, error;
dokld = dofile = 0;
optind = 1;
optreset = 1;
typestr = NULL;
if (argc == 1) {
command_errmsg = "no filename specified";
return(CMD_ERROR);
}
while ((ch = getopt(argc, argv, "kt:")) != -1) {
switch(ch) {
case 'k':
dokld = 1;
break;
case 't':
typestr = optarg;
dofile = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind - 1);
argc -= (optind - 1);
/*
* Request to load a raw file?
*/
if (dofile) {
if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
command_errmsg = "invalid load type";
return(CMD_ERROR);
}
return(file_loadraw(typestr, argv[1]));
}
/*
* Do we have explicit KLD load ?
*/
if (dokld || file_havepath(argv[1])) {
error = mod_loadkld(argv[1], argc - 2, argv + 2);
if (error == EEXIST)
sprintf(command_errbuf, "warning: KLD '%s' already loaded", argv[1]);
return (error == 0 ? CMD_OK : CMD_ERROR);
}
/*
* Looks like a request for a module.
*/
error = mod_load(argv[1], NULL, argc - 2, argv + 2);
if (error == EEXIST)
sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]);
return (error == 0 ? CMD_OK : CMD_ERROR);
}
COMMAND_SET(load_geli, "load_geli", "load a geli key", command_load_geli);
static int
command_load_geli(int argc, char *argv[])
{
char typestr[80];
char *cp;
int ch, num;
if (argc < 3) {
command_errmsg = "usage is [-n key#] <prov> <file>";
return(CMD_ERROR);
}
num = 0;
optind = 1;
optreset = 1;
while ((ch = getopt(argc, argv, "n:")) != -1) {
switch(ch) {
case 'n':
num = strtol(optarg, &cp, 0);
if (cp == optarg) {
sprintf(command_errbuf, "bad key index '%s'", optarg);
return(CMD_ERROR);
}
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind - 1);
argc -= (optind - 1);
sprintf(typestr, "%s:geli_keyfile%d", argv[1], num);
return(file_loadraw(typestr, argv[2]));
}
COMMAND_SET(unload, "unload", "unload all modules", command_unload);
static int
command_unload(int argc, char *argv[])
{
struct preloaded_file *fp;
while (preloaded_files != NULL) {
fp = preloaded_files;
preloaded_files = preloaded_files->f_next;
file_discard(fp);
}
loadaddr = 0;
unsetenv("kernelname");
return(CMD_OK);
}
COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
static int
command_lsmod(int argc, char *argv[])
{
struct preloaded_file *fp;
struct kernel_module *mp;
struct file_metadata *md;
char lbuf[80];
int ch, verbose;
verbose = 0;
optind = 1;
optreset = 1;
while ((ch = getopt(argc, argv, "v")) != -1) {
switch(ch) {
case 'v':
verbose = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
pager_open();
for (fp = preloaded_files; fp; fp = fp->f_next) {
sprintf(lbuf, " %p: %s (%s, 0x%lx)\n",
(void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size);
pager_output(lbuf);
if (fp->f_args != NULL) {
pager_output(" args: ");
pager_output(fp->f_args);
pager_output("\n");
}
if (fp->f_modules) {
pager_output(" modules: ");
for (mp = fp->f_modules; mp; mp = mp->m_next) {
sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version);
pager_output(lbuf);
}
pager_output("\n");
}
if (verbose) {
/* XXX could add some formatting smarts here to display some better */
for (md = fp->f_metadata; md != NULL; md = md->md_next) {
sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size);
pager_output(lbuf);
}
}
}
pager_close();
return(CMD_OK);
}
/*
* File level interface, functions file_*
*/
int
file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
{
struct preloaded_file *fp;
int error;
int i;
if (archsw.arch_loadaddr != NULL)
dest = archsw.arch_loadaddr(LOAD_RAW, filename, dest);
error = EFTYPE;
for (i = 0, fp = NULL; file_formats[i] && fp == NULL; i++) {
error = (file_formats[i]->l_load)(filename, dest, &fp);
if (error == 0) {
fp->f_loader = i; /* remember the loader */
*result = fp;
break;
}
if (error == EFTYPE)
continue; /* Unknown to this handler? */
if (error) {
sprintf(command_errbuf, "can't load file '%s': %s",
filename, strerror(error));
break;
}
}
return (error);
}
static int
file_load_dependencies(struct preloaded_file *base_file)
{
struct file_metadata *md;
struct preloaded_file *fp;
struct mod_depend *verinfo;
struct kernel_module *mp;
char *dmodname;
int error;
md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
if (md == NULL)
return (0);
error = 0;
do {
verinfo = (struct mod_depend*)md->md_data;
dmodname = (char *)(verinfo + 1);
if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
printf("loading required module '%s'\n", dmodname);
error = mod_load(dmodname, verinfo, 0, NULL);
if (error)
break;
/*
* If module loaded via kld name which isn't listed
* in the linker.hints file, we should check if it have
* required version.
*/
mp = file_findmodule(NULL, dmodname, verinfo);
if (mp == NULL) {
sprintf(command_errbuf, "module '%s' exists but with wrong version",
dmodname);
error = ENOENT;
break;
}
}
md = metadata_next(md, MODINFOMD_DEPLIST);
} while (md);
if (!error)
return (0);
/* Load failed; discard everything */
while (base_file != NULL) {
fp = base_file;
base_file = base_file->f_next;
file_discard(fp);
}
return (error);
}
/*
* We've been asked to load (name) as (type), so just suck it in,
* no arguments or anything.
*/
int
file_loadraw(char *type, char *name)
{
struct preloaded_file *fp;
char *cp;
int fd, got;
vm_offset_t laddr;
/* We can't load first */
if ((file_findfile(NULL, NULL)) == NULL) {
command_errmsg = "can't load file before kernel";
return(CMD_ERROR);
}
/* locate the file on the load path */
cp = file_search(name, NULL);
if (cp == NULL) {
sprintf(command_errbuf, "can't find '%s'", name);
return(CMD_ERROR);
}
name = cp;
if ((fd = open(name, O_RDONLY)) < 0) {
sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno));
free(name);
return(CMD_ERROR);
}
if (archsw.arch_loadaddr != NULL)
loadaddr = archsw.arch_loadaddr(LOAD_RAW, name, loadaddr);
laddr = loadaddr;
for (;;) {
/* read in 4k chunks; size is not really important */
got = archsw.arch_readin(fd, laddr, 4096);
if (got == 0) /* end of file */
break;
if (got < 0) { /* error */
sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno));
free(name);
close(fd);
return(CMD_ERROR);
}
laddr += got;
}
/* Looks OK so far; create & populate control structure */
fp = file_alloc();
fp->f_name = name;
fp->f_type = strdup(type);
fp->f_args = NULL;
fp->f_metadata = NULL;
fp->f_loader = -1;
fp->f_addr = loadaddr;
fp->f_size = laddr - loadaddr;
/* recognise space consumption */
loadaddr = laddr;
/* Add to the list of loaded files */
file_insert_tail(fp);
close(fd);
return(CMD_OK);
}
/*
* Load the module (name), pass it (argc),(argv), add container file
* to the list of loaded files.
* If module is already loaded just assign new argc/argv.
*/
int
mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
{
struct kernel_module *mp;
int err;
char *filename;
if (file_havepath(modname)) {
printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
return (mod_loadkld(modname, argc, argv));
}
/* see if module is already loaded */
mp = file_findmodule(NULL, modname, verinfo);
if (mp) {
#ifdef moduleargs
if (mp->m_args)
free(mp->m_args);
mp->m_args = unargv(argc, argv);
#endif
sprintf(command_errbuf, "warning: module '%s' already loaded", mp->m_name);
return (0);
}
/* locate file with the module on the search path */
filename = mod_searchmodule(modname, verinfo);
if (filename == NULL) {
sprintf(command_errbuf, "can't find '%s'", modname);
return (ENOENT);
}
err = mod_loadkld(filename, argc, argv);
return (err);
}
/*
* Load specified KLD. If path is omitted, then try to locate it via
* search path.
*/
int
mod_loadkld(const char *kldname, int argc, char *argv[])
{
struct preloaded_file *fp, *last_file;
int err;
char *filename;
/*
* Get fully qualified KLD name
*/
filename = file_search(kldname, kld_ext_list);
if (filename == NULL) {
sprintf(command_errbuf, "can't find '%s'", kldname);
return (ENOENT);
}
/*
* Check if KLD already loaded
*/
fp = file_findfile(filename, NULL);
if (fp) {
sprintf(command_errbuf, "warning: KLD '%s' already loaded", filename);
free(filename);
return (0);
}
for (last_file = preloaded_files;
last_file != NULL && last_file->f_next != NULL;
last_file = last_file->f_next)
;
do {
err = file_load(filename, loadaddr, &fp);
if (err)
break;
fp->f_args = unargv(argc, argv);
loadaddr = fp->f_addr + fp->f_size;
file_insert_tail(fp); /* Add to the list of loaded files */
if (file_load_dependencies(fp) != 0) {
err = ENOENT;
last_file->f_next = NULL;
loadaddr = last_file->f_addr + last_file->f_size;
fp = NULL;
break;
}
} while(0);
if (err == EFTYPE)
sprintf(command_errbuf, "don't know how to load module '%s'", filename);
if (err && fp)
file_discard(fp);
free(filename);
return (err);
}
/*
* Find a file matching (name) and (type).
* NULL may be passed as a wildcard to either.
*/
struct preloaded_file *
file_findfile(char *name, char *type)
{
struct preloaded_file *fp;
for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
if (((name == NULL) || !strcmp(name, fp->f_name)) &&
((type == NULL) || !strcmp(type, fp->f_type)))
break;
}
return (fp);
}
/*
* Find a module matching (name) inside of given file.
* NULL may be passed as a wildcard.
*/
struct kernel_module *
file_findmodule(struct preloaded_file *fp, char *modname,
struct mod_depend *verinfo)
{
struct kernel_module *mp, *best;
int bestver, mver;
if (fp == NULL) {
for (fp = preloaded_files; fp; fp = fp->f_next) {
mp = file_findmodule(fp, modname, verinfo);
if (mp)
return (mp);
}
return (NULL);
}
best = NULL;
bestver = 0;
for (mp = fp->f_modules; mp; mp = mp->m_next) {
if (strcmp(modname, mp->m_name) == 0) {
if (verinfo == NULL)
return (mp);
mver = mp->m_version;
if (mver == verinfo->md_ver_preferred)
return (mp);
if (mver >= verinfo->md_ver_minimum &&
mver <= verinfo->md_ver_maximum &&
mver > bestver) {
best = mp;
bestver = mver;
}
}
}
return (best);
}
/*
* Make a copy of (size) bytes of data from (p), and associate them as
* metadata of (type) to the module (mp).
*/
void
file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
{
struct file_metadata *md;
md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
md->md_size = size;
md->md_type = type;
bcopy(p, md->md_data, size);
md->md_next = fp->f_metadata;
fp->f_metadata = md;
}
/*
* Find a metadata object of (type) associated with the file (fp)
*/
struct file_metadata *
file_findmetadata(struct preloaded_file *fp, int type)
{
struct file_metadata *md;
for (md = fp->f_metadata; md != NULL; md = md->md_next)
if (md->md_type == type)
break;
return(md);
}
struct file_metadata *
metadata_next(struct file_metadata *md, int type)
{
if (md == NULL)
return (NULL);
while((md = md->md_next) != NULL)
if (md->md_type == type)
break;
return (md);
}
static char *emptyextlist[] = { "", NULL };
/*
* Check if the given file is in place and return full path to it.
*/
static char *
file_lookup(const char *path, const char *name, int namelen, char **extlist)
{
struct stat st;
char *result, *cp, **cpp;
int pathlen, extlen, len;
pathlen = strlen(path);
extlen = 0;
if (extlist == NULL)
extlist = emptyextlist;
for (cpp = extlist; *cpp; cpp++) {
len = strlen(*cpp);
if (len > extlen)
extlen = len;
}
result = malloc(pathlen + namelen + extlen + 2);
if (result == NULL)
return (NULL);
bcopy(path, result, pathlen);
if (pathlen > 0 && result[pathlen - 1] != '/')
result[pathlen++] = '/';
cp = result + pathlen;
bcopy(name, cp, namelen);
cp += namelen;
for (cpp = extlist; *cpp; cpp++) {
strcpy(cp, *cpp);
if (stat(result, &st) == 0 && S_ISREG(st.st_mode))
return result;
}
free(result);
return NULL;
}
/*
* Check if file name have any qualifiers
*/
static int
file_havepath(const char *name)
{
const char *cp;
archsw.arch_getdev(NULL, name, &cp);
return (cp != name || strchr(name, '/') != NULL);
}
/*
* Attempt to find the file (name) on the module searchpath.
* If (name) is qualified in any way, we simply check it and
* return it or NULL. If it is not qualified, then we attempt
* to construct a path using entries in the environment variable
* module_path.
*
* The path we return a pointer to need never be freed, as we manage
* it internally.
*/
static char *
file_search(const char *name, char **extlist)
{
struct moduledir *mdp;
struct stat sb;
char *result;
int namelen;
/* Don't look for nothing */
if (name == NULL)
return(NULL);
if (*name == 0)
return(strdup(name));
if (file_havepath(name)) {
/* Qualified, so just see if it exists */
if (stat(name, &sb) == 0)
return(strdup(name));
return(NULL);
}
moduledir_rebuild();
result = NULL;
namelen = strlen(name);
STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
result = file_lookup(mdp->d_path, name, namelen, extlist);
if (result)
break;
}
return(result);
}
#define INT_ALIGN(base, ptr) ptr = \
(base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
static char *
mod_search_hints(struct moduledir *mdp, const char *modname,
struct mod_depend *verinfo)
{
u_char *cp, *recptr, *bufend, *best;
char *result;
int *intp, bestver, blen, clen, found, ival, modnamelen, reclen;
moduledir_readhints(mdp);
modnamelen = strlen(modname);
found = 0;
result = NULL;
bestver = 0;
if (mdp->d_hints == NULL)
goto bad;
recptr = mdp->d_hints;
bufend = recptr + mdp->d_hintsz;
clen = blen = 0;
best = cp = NULL;
while (recptr < bufend && !found) {
intp = (int*)recptr;
reclen = *intp++;
ival = *intp++;
cp = (char*)intp;
switch (ival) {
case MDT_VERSION:
clen = *cp++;
if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
break;
cp += clen;
INT_ALIGN(mdp->d_hints, cp);
ival = *(int*)cp;
cp += sizeof(int);
clen = *cp++;
if (verinfo == NULL || ival == verinfo->md_ver_preferred) {
found = 1;
break;
}
if (ival >= verinfo->md_ver_minimum &&
ival <= verinfo->md_ver_maximum &&
ival > bestver) {
bestver = ival;
best = cp;
blen = clen;
}
break;
default:
break;
}
recptr += reclen + sizeof(int);
}
/*
* Finally check if KLD is in the place
*/
if (found)
result = file_lookup(mdp->d_path, cp, clen, NULL);
else if (best)
result = file_lookup(mdp->d_path, best, blen, NULL);
bad:
/*
* If nothing found or hints is absent - fallback to the old way
* by using "kldname[.ko]" as module name.
*/
if (!found && !bestver && result == NULL)
result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
return result;
}
/*
* Attempt to locate the file containing the module (name)
*/
static char *
mod_searchmodule(char *name, struct mod_depend *verinfo)
{
struct moduledir *mdp;
char *result;
moduledir_rebuild();
/*
* Now we ready to lookup module in the given directories
*/
result = NULL;
STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
result = mod_search_hints(mdp, name, verinfo);
if (result)
break;
}
return(result);
}
int
file_addmodule(struct preloaded_file *fp, char *modname, int version,
struct kernel_module **newmp)
{
struct kernel_module *mp;
struct mod_depend mdepend;
bzero(&mdepend, sizeof(mdepend));
mdepend.md_ver_preferred = version;
mp = file_findmodule(fp, modname, &mdepend);
if (mp)
return (EEXIST);
mp = malloc(sizeof(struct kernel_module));
if (mp == NULL)
return (ENOMEM);
bzero(mp, sizeof(struct kernel_module));
mp->m_name = strdup(modname);
mp->m_version = version;
mp->m_fp = fp;
mp->m_next = fp->f_modules;
fp->f_modules = mp;
if (newmp)
*newmp = mp;
return (0);
}
/*
* Throw a file away
*/
void
file_discard(struct preloaded_file *fp)
{
struct file_metadata *md, *md1;
struct kernel_module *mp, *mp1;
if (fp == NULL)
return;
md = fp->f_metadata;
while (md) {
md1 = md;
md = md->md_next;
free(md1);
}
mp = fp->f_modules;
while (mp) {
if (mp->m_name)
free(mp->m_name);
mp1 = mp;
mp = mp->m_next;
free(mp1);
}
if (fp->f_name != NULL)
free(fp->f_name);
if (fp->f_type != NULL)
free(fp->f_type);
if (fp->f_args != NULL)
free(fp->f_args);
free(fp);
}
/*
* Allocate a new file; must be used instead of malloc()
* to ensure safe initialisation.
*/
struct preloaded_file *
file_alloc(void)
{
struct preloaded_file *fp;
if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) {
bzero(fp, sizeof(struct preloaded_file));
}
return (fp);
}
/*
* Add a module to the chain
*/
static void
file_insert_tail(struct preloaded_file *fp)
{
struct preloaded_file *cm;
/* Append to list of loaded file */
fp->f_next = NULL;
if (preloaded_files == NULL) {
preloaded_files = fp;
} else {
for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
;
cm->f_next = fp;
}
}
static char *
moduledir_fullpath(struct moduledir *mdp, const char *fname)
{
char *cp;
cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
if (cp == NULL)
return NULL;
strcpy(cp, mdp->d_path);
strcat(cp, "/");
strcat(cp, fname);
return (cp);
}
/*
* Read linker.hints file into memory performing some sanity checks.
*/
static void
moduledir_readhints(struct moduledir *mdp)
{
struct stat st;
char *path;
int fd, size, version;
if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
return;
path = moduledir_fullpath(mdp, "linker.hints");
if (stat(path, &st) != 0 ||
st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) ||
st.st_size > 100 * 1024 || (fd = open(path, O_RDONLY)) < 0) {
free(path);
mdp->d_flags |= MDIR_NOHINTS;
return;
}
free(path);
size = read(fd, &version, sizeof(version));
if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
goto bad;
size = st.st_size - size;
mdp->d_hints = malloc(size);
if (mdp->d_hints == NULL)
goto bad;
if (read(fd, mdp->d_hints, size) != size)
goto bad;
mdp->d_hintsz = size;
close(fd);
return;
bad:
close(fd);
if (mdp->d_hints) {
free(mdp->d_hints);
mdp->d_hints = NULL;
}
mdp->d_flags |= MDIR_NOHINTS;
return;
}
/*
* Extract directories from the ';' separated list, remove duplicates.
*/
static void
moduledir_rebuild(void)
{
struct moduledir *mdp, *mtmp;
const char *path, *cp, *ep;
int cplen;
path = getenv("module_path");
if (path == NULL)
path = default_searchpath;
/*
* Rebuild list of module directories if it changed
*/
STAILQ_FOREACH(mdp, &moduledir_list, d_link)
mdp->d_flags |= MDIR_REMOVED;
for (ep = path; *ep != 0; ep++) {
cp = ep;
for (; *ep != 0 && *ep != ';'; ep++)
;
/*
* Ignore trailing slashes
*/
for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--)
;
STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0)
continue;
mdp->d_flags &= ~MDIR_REMOVED;
break;
}
if (mdp == NULL) {
mdp = malloc(sizeof(*mdp) + cplen + 1);
if (mdp == NULL)
return;
mdp->d_path = (char*)(mdp + 1);
bcopy(cp, mdp->d_path, cplen);
mdp->d_path[cplen] = 0;
mdp->d_hints = NULL;
mdp->d_flags = 0;
STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
}
if (*ep == 0)
break;
}
/*
* Delete unused directories if any
*/
mdp = STAILQ_FIRST(&moduledir_list);
while (mdp) {
if ((mdp->d_flags & MDIR_REMOVED) == 0) {
mdp = STAILQ_NEXT(mdp, d_link);
} else {
if (mdp->d_hints)
free(mdp->d_hints);
mtmp = mdp;
mdp = STAILQ_NEXT(mdp, d_link);
STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link);
free(mtmp);
}
}
return;
}