src/kmod-setup.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/wait.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <errno.h>
  26
  27 #include "macro.h"
  28 #include "execute.h"
  29
  30 #include "kmod-setup.h"
  31
  32 static const char * const kmod_table[] = {
  33         "autofs4", "/sys/class/misc/autofs",
  34         "ipv6",    "/sys/module/ipv6",
  35         "unix",    "/proc/net/unix"
  36 };
  37
  38 int kmod_setup(void) {
  39         unsigned i, n = 0;
  40         const char * cmdline[3 + ELEMENTSOF(kmod_table) + 1];
  41         ExecCommand command;
  42         ExecContext context;
  43         pid_t pid;
  44         int r;
  45
  46         for (i = 0; i < ELEMENTSOF(kmod_table); i += 2) {
  47
  48                 if (access(kmod_table[i+1], F_OK) >= 0)
  49                         continue;
  50
  51                 log_debug("Your kernel apparently lacks built-in %s support. Might be a good idea to compile it in. "
  52                           "We'll now try to work around this by calling '/sbin/modprobe %s'...",
  53                           kmod_table[i], kmod_table[i]);
  54
  55                 cmdline[3 + n++] = kmod_table[i];
  56         }
  57
  58         if (n <= 0)
  59                 return 0;
  60
  61         cmdline[0] = "/sbin/modprobe";
  62         cmdline[1] = "-qab";
  63         cmdline[2] = "--";
  64         cmdline[3 + n] = NULL;
  65
  66         zero(command);
  67         zero(context);
  68
  69         command.path = (char*) cmdline[0];
  70         command.argv = (char**) cmdline;
  71
  72         exec_context_init(&context);
  73         r = exec_spawn(&command, NULL, &context, NULL, 0, NULL, false, false, false, false, NULL, &pid);
  74         exec_context_done(&context);
  75
  76         if (r < 0) {
  77                 log_error("Failed to spawn %s: %s", cmdline[0], strerror(-r));
  78                 return r;
  79         }
  80
  81         return wait_for_terminate_and_warn(cmdline[0], pid);
  82 }