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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <libkmod.h>
#include "macro.h"
#include "execute.h"
#include "kmod-setup.h"
typedef struct Kmodule {
const char *name;
const char *directory;
bool (*condition_fn)(void);
} KModule;
static const KModule kmod_table[] = {
{ "autofs4", "/sys/class/misc/autofs", NULL } ,
{ "ipv6", "/sys/module/ipv6", NULL },
{ "efivarfs", "/sys/firmware/efi/efivars", NULL },
{ "unix", "/proc/net/unix", NULL } ,
};
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
static void systemd_kmod_log(void *data, int priority, const char *file, int line,
const char *fn, const char *format, va_list args)
{
/* library logging is enabled at debug only */
log_metav(LOG_DEBUG, file, line, fn, format, args);
}
#pragma GCC diagnostic pop
int kmod_setup(void) {
unsigned i;
struct kmod_ctx *ctx = NULL;
struct kmod_module *mod;
int err;
for (i = 0; i < ELEMENTSOF(kmod_table); i += 2) {
if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn())
continue;
if (access(kmod_table[i].directory, F_OK) >= 0)
continue;
log_debug("Your kernel apparently lacks built-in %s support. Might be a good idea to compile it in. "
"We'll now try to work around this by loading the module...",
kmod_table[i].name);
if (!ctx) {
ctx = kmod_new(NULL, NULL);
if (!ctx) {
log_error("Failed to allocate memory for kmod");
return -ENOMEM;
}
kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
kmod_load_resources(ctx);
}
err = kmod_module_new_from_name(ctx, kmod_table[i].name, &mod);
if (err < 0) {
log_error("Failed to lookup module '%s'", kmod_table[i].name);
continue;
}
err = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL);
if (err == 0)
log_info("Inserted module '%s'", kmod_module_get_name(mod));
else if (err == KMOD_PROBE_APPLY_BLACKLIST)
log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
else
log_error("Failed to insert module '%s'", kmod_module_get_name(mod));
kmod_module_unref(mod);
}
if (ctx)
kmod_unref(ctx);
return 0;
}
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