95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* load kernel modules
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*
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* Copyright © 2011 ProFUSION embedded systems
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*/
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "device-util.h"
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#include "module-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "udev-builtin.h"
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static struct kmod_ctx *ctx = NULL;
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_printf_(6,0) static void udev_kmod_log(void *data, int priority, const char *file, int line, const char *fn, const char *format, va_list args) {
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log_internalv(priority, 0, file, line, fn, format, args);
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}
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static int builtin_kmod(UdevEvent *event, int argc, char *argv[], bool test) {
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sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
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int r;
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if (!ctx)
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return 0;
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if (argc < 2 || !streq(argv[1], "load"))
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return log_device_warning_errno(dev, SYNTHETIC_ERRNO(EINVAL),
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"%s: expected: load [module…]", argv[0]);
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char **modules = strv_skip(argv, 2);
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if (strv_isempty(modules)) {
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const char *modalias;
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r = sd_device_get_property_value(dev, "MODALIAS", &modalias);
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if (r < 0)
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return log_device_warning_errno(dev, r, "Failed to read property \"MODALIAS\".");
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(void) module_load_and_warn(ctx, modalias, /* verbose = */ false);
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} else
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STRV_FOREACH(module, modules)
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(void) module_load_and_warn(ctx, *module, /* verbose = */ false);
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return 0;
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}
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/* called at udev startup and reload */
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static int builtin_kmod_init(void) {
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if (ctx)
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return 0;
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ctx = kmod_new(NULL, NULL);
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if (!ctx)
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return -ENOMEM;
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log_debug("Loading kernel module index.");
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kmod_set_log_fn(ctx, udev_kmod_log, NULL);
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kmod_load_resources(ctx);
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return 0;
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}
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/* called on udev shutdown and reload request */
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static void builtin_kmod_exit(void) {
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log_debug("Unload kernel module index.");
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ctx = kmod_unref(ctx);
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}
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/* called every couple of seconds during event activity; 'true' if config has changed */
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static bool builtin_kmod_should_reload(void) {
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if (!ctx)
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return false;
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if (kmod_validate_resources(ctx) != KMOD_RESOURCES_OK) {
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log_debug("Kernel module index needs reloading.");
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return true;
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}
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return false;
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}
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const UdevBuiltin udev_builtin_kmod = {
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.name = "kmod",
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.cmd = builtin_kmod,
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.init = builtin_kmod_init,
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.exit = builtin_kmod_exit,
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.should_reload = builtin_kmod_should_reload,
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.help = "Kernel module loader",
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.run_once = false,
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};
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