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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* load kernel modules
*
* Copyright © 2011 ProFUSION embedded systems
*/
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include "device-util.h"
#include "module-util.h"
#include "string-util.h"
#include "strv.h"
#include "udev-builtin.h"
static struct kmod_ctx *ctx = NULL;
static int builtin_kmod(UdevEvent *event, int argc, char *argv[]) {
sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
int r;
if (event->event_mode != EVENT_UDEV_WORKER) {
log_device_debug(dev, "Running in test mode, skipping execution of 'kmod' builtin command.");
return 0;
}
if (!ctx)
return 0;
if (argc < 2 || !streq(argv[1], "load"))
return log_device_warning_errno(dev, SYNTHETIC_ERRNO(EINVAL),
"%s: expected: load [module…]", argv[0]);
char **modules = strv_skip(argv, 2);
if (strv_isempty(modules)) {
const char *modalias;
r = sd_device_get_property_value(dev, "MODALIAS", &modalias);
if (r < 0)
return log_device_warning_errno(dev, r, "Failed to read property \"MODALIAS\": %m");
(void) module_load_and_warn(ctx, modalias, /* verbose = */ false);
} else
STRV_FOREACH(module, modules)
(void) module_load_and_warn(ctx, *module, /* verbose = */ false);
return 0;
}
/* called at udev startup and reload */
static int builtin_kmod_init(void) {
int r;
if (ctx)
return 0;
log_debug("Loading kernel module index.");
r = module_setup_context(&ctx);
if (r < 0)
return log_error_errno(r, "Failed to initialize libkmod context: %m");
return 0;
}
/* called on udev shutdown and reload request */
static void builtin_kmod_exit(void) {
log_debug("Unload kernel module index.");
if (!ctx)
return;
ctx = sym_kmod_unref(ctx);
}
/* called every couple of seconds during event activity; 'true' if config has changed */
static bool builtin_kmod_should_reload(void) {
if (!ctx)
return false;
if (sym_kmod_validate_resources(ctx) != KMOD_RESOURCES_OK) {
log_debug("Kernel module index needs reloading.");
return true;
}
return false;
}
const UdevBuiltin udev_builtin_kmod = {
.name = "kmod",
.cmd = builtin_kmod,
.init = builtin_kmod_init,
.exit = builtin_kmod_exit,
.should_reload = builtin_kmod_should_reload,
.help = "Kernel module loader",
.run_once = false,
};
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