src/udev/udev-builtin-kmod.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * load kernel modules
   4  *
   5  * Copyright © 2011 ProFUSION embedded systems
   6  */
   7
   8 #include <errno.h>
   9 #include <stdarg.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12
  13 #include "module-util.h"
  14 #include "string-util.h"
  15 #include "udev-builtin.h"
  16
  17 static struct kmod_ctx *ctx = NULL;
  18
  19 _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) {
  20         log_internalv(priority, 0, file, line, fn, format, args);
  21 }
  22
  23 static int builtin_kmod(sd_device *dev, int argc, char *argv[], bool test) {
  24         int i;
  25
  26         if (!ctx)
  27                 return 0;
  28
  29         if (argc < 3 || !streq(argv[1], "load"))
  30                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  31                                        "%s: expected: load <module>", argv[0]);
  32
  33         for (i = 2; argv[i]; i++)
  34                 (void) module_load_and_warn(ctx, argv[i], false);
  35
  36         return 0;
  37 }
  38
  39 /* called at udev startup and reload */
  40 static int builtin_kmod_init(void) {
  41         if (ctx)
  42                 return 0;
  43
  44         ctx = kmod_new(NULL, NULL);
  45         if (!ctx)
  46                 return -ENOMEM;
  47
  48         log_debug("Load module index");
  49         kmod_set_log_fn(ctx, udev_kmod_log, NULL);
  50         kmod_load_resources(ctx);
  51         return 0;
  52 }
  53
  54 /* called on udev shutdown and reload request */
  55 static void builtin_kmod_exit(void) {
  56         log_debug("Unload module index");
  57         ctx = kmod_unref(ctx);
  58 }
  59
  60 /* called every couple of seconds during event activity; 'true' if config has changed */
  61 static bool builtin_kmod_validate(void) {
  62         log_debug("Validate module index");
  63         if (!ctx)
  64                 return false;
  65         return (kmod_validate_resources(ctx) != KMOD_RESOURCES_OK);
  66 }
  67
  68 const UdevBuiltin udev_builtin_kmod = {
  69         .name = "kmod",
  70         .cmd = builtin_kmod,
  71         .init = builtin_kmod_init,
  72         .exit = builtin_kmod_exit,
  73         .validate = builtin_kmod_validate,
  74         .help = "Kernel module loader",
  75         .run_once = false,
  76 };