tools/kmod.c

   1 /*
   2  * kmod - one tool to rule them all
   3  *
   4  * Copyright (C) 2011  ProFUSION embedded systems
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <getopt.h>
  24 #include <string.h>
  25 #include <libkmod.h>
  26 #include "kmod.h"
  27
  28 static const char options_s[] = "+hV";
  29 static const struct option options[] = {
  30         { "help", no_argument, NULL, 'h' },
  31         { "version", no_argument, NULL, 'V' },
  32         {}
  33 };
  34
  35 static const struct kmod_cmd kmod_cmd_help;
  36
  37 static const struct kmod_cmd *kmod_cmds[] = {
  38         &kmod_cmd_help,
  39 };
  40
  41 static const struct kmod_cmd *kmod_compat_cmds[] = {
  42         &kmod_cmd_compat_lsmod,
  43         &kmod_cmd_compat_rmmod,
  44         &kmod_cmd_compat_insmod,
  45 };
  46
  47 static int kmod_help(int argc, char *argv[])
  48 {
  49         size_t i;
  50
  51         printf("Manage kernel modules: list, load, unload, etc\n"
  52                         "Usage:\n"
  53                         "\t%s [options] command [command_options]\n\n"
  54                         "Options:\n"
  55                         "\t-V, --version     show version\n"
  56                         "\t-h, --help        show this help\n\n"
  57                         "Commands:\n", basename(argv[0]));
  58
  59         for (i = 0; i < ARRAY_SIZE(kmod_cmds); i++) {
  60                 if (kmod_cmds[i]->help != NULL) {
  61                         printf("  %-12s %s\n", kmod_cmds[i]->name,
  62                                                         kmod_cmds[i]->help);
  63                 }
  64         }
  65
  66         puts("\nkmod also handles gracefully if called from following symlinks:");
  67
  68         for (i = 0; i < ARRAY_SIZE(kmod_compat_cmds); i++) {
  69                 if (kmod_compat_cmds[i]->help != NULL) {
  70                         printf("  %-12s %s\n", kmod_compat_cmds[i]->name,
  71                                                 kmod_compat_cmds[i]->help);
  72                 }
  73         }
  74
  75         return EXIT_SUCCESS;
  76 }
  77
  78 static const struct kmod_cmd kmod_cmd_help = {
  79         .name = "help",
  80         .cmd = kmod_help,
  81         .help = "Show help message",
  82 };
  83
  84 static int handle_kmod_commands(int argc, char *argv[])
  85 {
  86         const char *cmd;
  87         int err = 0;
  88         size_t i;
  89
  90         for (;;) {
  91                 int c;
  92
  93                 c = getopt_long(argc, argv, options_s, options, NULL);
  94                 if (c == -1)
  95                         break;
  96
  97                 switch (c) {
  98                 case 'h':
  99                         kmod_help(argc, argv);
 100                         return EXIT_SUCCESS;
 101                 case 'V':
 102                         puts("kmod version " VERSION);
 103                         return EXIT_SUCCESS;
 104                 case '?':
 105                         return EXIT_FAILURE;
 106                 default:
 107                         fprintf(stderr, "Error: unexpected getopt_long() value '%c'.\n", c);
 108                         return EXIT_FAILURE;
 109                 }
 110         }
 111
 112         if (optind >= argc) {
 113                 err = -ENOENT;
 114                 goto finish;
 115         }
 116
 117         cmd = argv[optind];
 118
 119         for (i = 0; i < ARRAY_SIZE(kmod_cmds); i++) {
 120                 if (strcmp(kmod_cmds[i]->name, cmd) != 0)
 121                         continue;
 122
 123                 err = kmod_cmds[i]->cmd(--argc, ++argv);
 124         }
 125
 126 finish:
 127         if (err < 0) {
 128                 fputs("missing or unknown command; "
 129                         "see 'kmod help' for a list of available commands\n", stderr);
 130         }
 131
 132         return err;
 133 }
 134
 135
 136 static int handle_kmod_compat_commands(int argc, char *argv[])
 137 {
 138         const char *cmd;
 139         int err = -ENOENT;
 140         size_t i;
 141
 142         cmd = basename(argv[0]);
 143
 144         for (i = 0; i < ARRAY_SIZE(kmod_compat_cmds); i++) {
 145                 if (strcmp(kmod_compat_cmds[i]->name, cmd) != 0)
 146                         continue;
 147
 148                 err = kmod_compat_cmds[i]->cmd(argc, argv);
 149         }
 150
 151         return err;
 152 }
 153
 154 int main(int argc, char *argv[])
 155 {
 156         const char *binname = basename(argv[0]);
 157         int err;
 158
 159         if (strcmp(binname, "kmod") == 0)
 160                 err = handle_kmod_commands(argc, argv);
 161         else
 162                 err = handle_kmod_compat_commands(argc, argv);
 163
 164         return err;
 165 }