/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef included_clib_mhash_h
#define included_clib_mhash_h

/*
  Copyright (c) 2010 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include <vppinfra/format.h>
#include <vppinfra/hash.h>
#include <vppinfra/heap.h>

/* Hash table plus vector of keys. */
typedef struct
{
  /* Vector or heap used to store keys.  Hash table stores keys as byte
     offsets into this vector. */
  u8 *key_vector_or_heap;

  /* Byte offsets of free keys in vector (used to store free keys when
     n_key_bytes > 1). */
  u32 *key_vector_free_indices;

  u8 **key_tmps;

  /* Possibly fixed size of key.
     0 means keys are vectors of u8's.
     1 means keys are null terminated c strings. */
#define MHASH_VEC_STRING_KEY 0
#define MHASH_C_STRING_KEY 1
  u32 n_key_bytes;

  /* Seed value for Jenkins hash. */
  u32 hash_seed;

  /* Hash table mapping key -> value. */
  uword *hash;

  /* Format function for keys. */
  format_function_t *format_key;
} mhash_t;

void mhash_init (mhash_t * h, uword n_value_bytes, uword n_key_bytes);

always_inline void
mhash_init_c_string (mhash_t * h, uword n_value_bytes)
{
  mhash_init (h, n_value_bytes, MHASH_C_STRING_KEY);
}

always_inline void
mhash_init_vec_string (mhash_t * h, uword n_value_bytes)
{
  mhash_init (h, n_value_bytes, MHASH_VEC_STRING_KEY);
}

always_inline void *
mhash_key_to_mem (mhash_t * h, uword key)
{
  if (key == ~0)
    {
      u8 *key_tmp;

      int my_cpu = os_get_thread_index ();
      vec_validate (h->key_tmps, my_cpu);
      key_tmp = h->key_tmps[my_cpu];
      return key_tmp;
    }
  return vec_elt_at_index (h->key_vector_or_heap, key);
}

hash_pair_t *mhash_get_pair (mhash_t * h, const void *key);
uword mhash_set_mem (mhash_t * h
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/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * main.c: Unix main routine
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlib/unix/plugin.h>

#include <signal.h>
#include <sys/ucontext.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>

/** Default CLI pager limit is not configured in startup.conf */
#define UNIX_CLI_DEFAULT_PAGER_LIMIT 100000

/** Default CLI history depth if not configured in startup.conf */
#define UNIX_CLI_DEFAULT_HISTORY 50

char *vlib_default_runtime_dir __attribute__ ((weak));
char *vlib_default_runtime_dir = "vlib";

unix_main_t unix_main;
clib_file_main_t file_main;

static clib_error_t *
unix_main_init (vlib_main_t * vm)
{
  unix_main_t *um = &unix_main;
  um->vlib_main = vm;
  return vlib_call_init_function (vm, unix_input_init);
}

VLIB_INIT_FUNCTION (unix_main_init);

static int
unsetup_signal_handlers (int sig)
{
  struct sigaction sa;

  sa.sa_handler = SIG_DFL;
  sa.sa_flags = 0;
  sigemptyset (&sa.sa_mask);
  return sigaction (sig, &sa, 0);
}


/* allocate this buffer from mheap when setting up the signal handler.
    dangerous to vec_resize it when crashing, mheap itself might have been
    corruptted already */
static u8 *syslog_msg = 0;

static void
unix_signal_handler (int signum, siginfo_t * si, ucontext_t * uc)
{
  uword fatal = 0;

  syslog_msg = format (syslog_msg, "received signal %U, PC %U",
		       format_signal, signum, format_ucontext_pc, uc);

  if (signum == SIGSEGV)
    syslog_msg = format (syslog_msg, ", faulting address %p", si->si_addr);

  switch (signum)
    {
      /* these (caught) signals cause the application to exit */
    case SIGTERM:
      if (unix_main.vlib_main->main_loop_exit_set)
	{
	  syslog (LOG_ERR | LOG_DAEMON, "received SIGTERM, exiting...");
	  unix_main.vlib_main->main_loop_exit_now = 1;
	}
      break;
      /* fall through */
    case SIGQUIT:
    case SIGINT:
    case SIGILL:
    case SIGBUS:
    case SIGSEGV:
    case SIGHUP:
    case SIGFPE:
    case SIGABRT:
      fatal = 1;
      break;

      /* by default, print a message and continue */
    default:
      fatal = 0;
      break;
    }

  /* Null terminate. */
  vec_add1 (syslog_msg, 0);

  if (fatal)
    {
      syslog (LOG_ERR | LOG_DAEMON, "%s", syslog_msg);

      /* Address of callers: outer first, inner last. */
      uword callers[15];
      uword n_callers = clib_backtrace (callers, ARRAY_LEN (callers), 0);
      int i;
      for (i = 0; i < n_callers; i++)
	{
	  vec_reset_length (syslog_msg);

	  syslog_msg =
	    format (syslog_msg, "#%-2d 0x%016lx %U%c", i, callers[i],
		    format_clib_elf_symbol_with_address, callers[i], 0);

	  syslog (LOG_ERR | LOG_DAEMON, "%s", syslog_msg);
	}

      /* have to remove SIGABRT to avoid recusive - os_exit calling abort() */
      unsetup_signal_handlers (SIGABRT);

      os_exit (1);
    }
  else
    clib_warning ("%s", syslog_msg);

}

static clib_error_t *
setup_signal_handlers (unix_main_t * um)
{
  uword i;
  struct sigaction sa;

  /* give a big enough buffer for msg, most likely it can avoid vec_resize  */
  vec_alloc (syslog_msg, 2048);

  for (i = 1; i < 32; i++)
    {
      clib_memset (&sa, 0, sizeof (sa));
      sa.sa_sigaction = (void *) unix_signal_handler;
      sa.sa_flags = SA_SIGINFO;

      switch (i)
	{
	  /* these signals take the default action */
	case SIGKILL:
	case SIGSTOP:
	case SIGUSR1:
	case SIGUSR2:
	  continue;

	  /* ignore SIGPIPE, SIGCHLD */
	case SIGPIPE:
	case SIGCHLD:
	  sa.sa_sigaction = (void *) SIG_IGN;
	  break;

	  /* catch and handle all other signals */
	default:
	  break;
	}

      if (sigaction (i, &sa, 0) < 0)
	return clib_error_return_unix (0, "sigaction %U", format_signal, i);
    }

  return 0;
}

static void
unix_error_handler (void *arg, u8 * msg, int msg_len)
{
  unix_main_t *um = arg;

  /* Echo to stderr when interactive. */
  if (um->flags & UNIX_FLAG_INTERACTIVE)
    {
      CLIB_UNUSED (int r) = write (2, msg, msg_len);
    }
  else
    {
      char save = msg[msg_len - 1];

      /* Null Terminate. */
      msg[msg_len - 1] = 0;

      syslog (LOG_ERR | LOG_DAEMON, "%s", msg);

      msg[msg_len - 1] = save;
    }
}

void
vlib_unix_error_report (vlib_main_t * vm, clib_error_t * error)
{
  unix_main_t *um = &unix_main;

  if (um->flags & UNIX_FLAG_INTERACTIVE || error == 0)
    return;

  {
    char save;
    u8 *msg;
    u32 msg_len;

    msg = error->what;
    msg_len = vec_len (msg);

    /* Null Terminate. */
    save = msg[msg_len - 1];
    msg[msg_len - 1] = 0;

    syslog (LOG_ERR | LOG_DAEMON, "%s", msg);

    msg[msg_len - 1] = save;
  }
}

static uword
startup_config_process (vlib_main_t * vm,
			vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  unix_main_t *um = &unix_main;
  u8 *buf = 0;
  uword l, n = 1;

  vlib_process_suspend (vm, 2.0);

  while (um->unix_config_complete == 0)
    vlib_process_suspend (vm, 0.1);

  if (um->startup_config_filename)
    {
      unformat_input_t sub_input;
      int fd;
      struct stat s;
      char *fn = (char *) um->startup_config_filename;

      fd = open (fn, O_RDONLY);
      if (fd < 0)
	{
	  clib_warning ("failed to open `%s'", fn);
	  return 0;
	}

      if (fstat (fd, &s) < 0)
	{
	  clib_warning ("failed to stat `%s'", fn);
	bail:
	  close (fd);
	  return 0;
	}

      if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
	{
	  clib_warning ("not a regular file: `%s'", fn);
	  goto bail;
	}

      while (n > 0)
	{
	  l = vec_len (buf);
	  vec_resize (buf, 4096);
	  n = read (fd, buf + l, 4096);
	  if (n > 0)
	    {
	      _vec_len (buf) = l + n;
	      if (n < 4096)
		break;
	    }
	  else
	    break;
	}
      if (um->log_fd && vec_len (buf))
	{
	  u8 *lv = 0;
	  lv = format (lv, "%U: ***** Startup Config *****\n%v",
		       format_timeval, 0 /* current bat-time */ ,
		       0 /* current bat-format */ ,
		       buf);
	  {
	    int rv __attribute__ ((unused)) =
	      write (um->log_fd, lv, vec_len (lv));
	  }
	  vec_reset_length (lv);
	  lv = format (lv, "%U: ***** End Startup Config *****\n",
		       format_timeval, 0 /* current bat-time */ ,
		       0 /* current bat-format */ );
	  {
	    int rv __attribute__ ((unused)) =
	      write (um->log_fd, lv, vec_len (lv));
	  }
	  vec_free (lv);
	}

      if (vec_len (buf))
	{
	  unformat_init_vector (&sub_input, buf);
	  vlib_cli_input (vm, &sub_input, 0, 0);
	  /* frees buf for us */
	  unformat_free (&sub_input);
	}
      close (fd);
    }
  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (startup_config_node,static) = {
    .function = startup_config_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "startup-config-process",
};
/* *INDENT-ON* */

static clib_error_t *
unix_config (vlib_main_t * vm, unformat_input_t * input)
{
  unix_main_t *um = &unix_main;
  clib_error_t *error = 0;
  gid_t gid;
  int pidfd = -1;

  /* Defaults */
  um->cli_pager_buffer_limit = UNIX_CLI_DEFAULT_PAGER_LIMIT;
  um->cli_history_limit = UNIX_CLI_DEFAULT_HISTORY;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      char *cli_prompt;
      if (unformat (input, "interactive"))
	um->flags |= UNIX_FLAG_INTERACTIVE;
      else if (unformat (input, "nodaemon"))
	um->flags |= UNIX_FLAG_NODAEMON;
      else if (unformat (input, "cli-prompt %s", &cli_prompt))
	vlib_unix_cli_set_prompt (cli_prompt);
      else
	if (unformat (input, "cli-listen %s", &um->cli_listen_socket.config))
	;
      else if (unformat (input, "runtime-dir %s", &um->runtime_dir))
	;
      else if (unformat (input, "cli-line-mode"))
	um->cli_line_mode = 1;
      else if (unformat (input, "cli-no-banner"))
	um->cli_no_banner = 1;
      else if (unformat (input, "cli-no-pager"))
	um->cli_no_pager = 1;
      else if (unformat (input, "poll-sleep-usec %d", &um->poll_sleep_usec))
	;
      else if (unformat (input, "cli-pager-buffer-limit %d",
			 &um->cli_pager_buffer_limit))
	;
      else
	if (unformat (input, "cli-history-limit %d", &um->cli_history_limit))
	;
      else if (unformat (input, "coredump-size"))
	{
	  uword coredump_size = 0;
	  if (unformat (input, "unlimited"))
	    {
	      coredump_size = RLIM_INFINITY;
	    }
	  else
	    if (!unformat (input, "%U", unformat_memory_size, &coredump_size))
	    {
	      return clib_error_return (0,
					"invalid coredump-size parameter `%U'",
					format_unformat_error, input);
	    }
	  const struct rlimit new_limit = { coredump_size, coredump_size };
	  if (0 != setrlimit (RLIMIT_CORE, &new_limit))
	    {
	      clib_unix_warning ("prlimit() failed");
	    }
	}
      else if (unformat (input, "full-coredump"))
	{
	  int fd;

	  fd = open ("/proc/self/coredump_filter", O_WRONLY);
	  if (fd >= 0)
	    {
	      if (write (fd, "0x6f\n", 5) != 5)
		clib_unix_warning ("coredump filter write failed!");
	      close (fd);
	    }
	  else
	    clib_unix_warning ("couldn't open /proc/self/coredump_filter");
	}
      else if (unformat (input, "startup-config %s",
			 &um->startup_config_filename))
	;
      else if (unformat (input, "exec %s", &um->startup_config_filename))
	;
      else if (unformat (input, "log %s", &um->log_filename))
	{
	  um->log_fd = open ((char *) um->log_filename,
			     O_CREAT | O_WRONLY | O_APPEND, 0644);
	  if (um->log_fd < 0)
	    {
	      clib_warning ("couldn't open log '%s'\n", um->log_filename);
	      um->log_fd = 0;
	    }
	  else
	    {
	      u8 *lv = 0;
	      lv = format (0, "%U: ***** Start: PID %d *****\n",
			   format_timeval, 0 /* current bat-time */ ,
			   0 /* current bat-format */ ,
			   getpid ());
	      {
		int rv __attribute__ ((unused)) =
		  write (um->log_fd, lv, vec_len (lv));
	      }
	      vec_free (lv);
	    }
	}
      else if (unformat (input, "gid %U", unformat_unix_gid, &gid))
	{
	  if (setegid (gid) == -1)
	    return clib_error_return_unix (0, "setegid");
	}
      else if (unformat (input, "pidfile %s", &um->pidfile))
	;
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, input);
    }

  if (um->runtime_dir == 0)
    {
      uid_t uid = geteuid ();
      if (uid == 00)
	um->runtime_dir = format (0, "/run/%s%c",
				  vlib_default_runtime_dir, 0);
      else
	um->runtime_dir = format (0, "/run/user/%u/%s%c", uid,
				  vlib_default_runtime_dir, 0);
    }

  error = setup_signal_handlers (um);
  if (error)
    return error;

  if (um->pidfile)
    {
      if ((error = vlib_unix_validate_runtime_file (um,
						    (char *) um->pidfile,
						    &um->pidfile)))
	return error;

      if (((pidfd = open ((char *) um->pidfile,
			  O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0))
	{
	  return clib_error_return_unix (0, "open");
	}
    }

  if (!(um->flags & UNIX_FLAG_INTERACTIVE))
    {
      openlog (vm->name, LOG_CONS | LOG_PERROR | LOG_PID, LOG_DAEMON);
      clib_error_register_handler (unix_error_handler, um);

      if (!(um->flags & UNIX_FLAG_NODAEMON) && daemon ( /* chdir to / */ 0,
						       /* stdin/stdout/stderr -> /dev/null */
						       0) < 0)
	clib_error_return (0, "daemon () fails");
    }

  if (pidfd >= 0)
    {
      u8 *lv = format (0, "%d", getpid ());
      if (write (pidfd, (char *) lv, vec_len (lv)) != vec_len (lv))
	{
	  vec_free (lv);
	  close (pidfd);
	  return clib_error_return_unix (0, "write");
	}
      vec_free (lv);
      close (pidfd);
    }

  um->unix_config_complete = 1;

  return 0;
}

/* unix { ... } configuration. */
/*?
 *
 * @cfgcmd{interactive}
 * Attach CLI to stdin/out and provide a debugging command line interface.
 * Implies @c nodaemon.
 *
 * @cfgcmd{nodaemon}
 * Do not fork or background the VPP process. Typically used when invoking
 * VPP applications from a process monitor.
 *
 * @cfgcmd{exec, &lt;filename&gt;}
 * @par <code>startup-config &lt;filename&gt;</code>
 * Read startup operational configuration from @c filename.
 * The contents of the file will be performed as though entered at the CLI.
 * The two keywords are aliases for the same function; if both are specified,
 * only the last will have an effect.
 *
 * @cfgcmd{log, &lt;filename&gt;}
 * Logs the startup configuration and all subsequent CLI commands in
 * @c filename.
 * Very useful in situations where folks don't remember or can't be bothered
 * to include CLI commands in bug reports.
 *
 * @cfgcmd{pidfile, &lt;filename&gt;}
 * Writes the pid of the main thread in @c filename.
 *
 * @cfgcmd{full-coredump}
 * Ask the Linux kernel to dump all memory-mapped address regions, instead
 * of just text+data+bss.
 *
 * @cfgcmd{runtime-dir}
 * Define directory where VPP is going to store all runtime files.
 * Default is /run/vpp.
 *
 * @cfgcmd{cli-listen, &lt;address:port&gt;}
 * Bind the CLI to listen at the address and port given. @clocalhost
 * on TCP port @c 5002, given as <tt>cli-listen localhost:5002</tt>,
 * is typical.
 *
 * @cfgcmd{cli-line-mode}
 * Disable character-by-character I/O on stdin. Useful when combined with,
 * for example, <tt>emacs M-x gud-gdb</tt>.
 *
 * @cfgcmd{cli-prompt, &lt;string&gt;}
 * Configure the CLI prompt to be @c string.
 *
 * @cfgcmd{cli-history-limit, &lt;nn&gt;}
 * Limit commmand history to @c nn  lines. A value of @c 0
 * disables command history. Default value: @c 50
 *
 * @cfgcmd{cli-no-banner}
 * Disable the login banner on stdin and Telnet connections.
 *
 * @cfgcmd{cli-no-pager}
 * Disable the output pager.
 *
 * @cfgcmd{cli-pager-buffer-limit, &lt;nn&gt;}
 * Limit pager buffer to @c nn lines of output.
 * A value of @c 0 disables the pager. Default value: @c 100000
?*/
VLIB_EARLY_CONFIG_FUNCTION (unix_config, "unix");

static clib_error_t *
unix_exit (vlib_main_t * vm)
{
  /* Close syslog connection. */
  closelog ();
  return 0;
}

VLIB_MAIN_LOOP_EXIT_FUNCTION (unix_exit);

u8 **vlib_thread_stacks;

static uword
thread0 (uword arg)
{
  vlib_main_t *vm = (vlib_main_t *) arg;
  unformat_input_t input;
  int i;

  unformat_init_command_line (&input, (char **) vm->argv);
  i = vlib_main (vm, &input);
  unformat_free (&input);

  return i;
}

u8 *
vlib_thread_stack_init (uword thread_index)
{
  vec_validate (vlib_thread_stacks, thread_index);
  vlib_thread_stacks[thread_index] = clib_mem_alloc_aligned
    (VLIB_THREAD_STACK_SIZE, VLIB_THREAD_STACK_SIZE);

  /*
   * Disallow writes to the bottom page of the stack, to
   * catch stack overflows.
   */
  if (mprotect (vlib_thread_stacks[thread_index],
		clib_mem_get_page_size (), PROT_READ) < 0)
    clib_unix_warning ("thread stack");
  return vlib_thread_stacks[thread_index];
}

int
vlib_unix_main (int argc, char *argv[])
{
  vlib_main_t *vm = &vlib_global_main;	/* one and only time for this! */
  unformat_input_t input;
  clib_error_t *e;
  int i;

  vm->argv = (u8 **) argv;
  vm->name = argv[0];
  vm->heap_base = clib_mem_get_heap ();
  vm->heap_aligned_base = (void *)
    (((uword) vm->heap_base) & ~(VLIB_FRAME_ALIGN - 1));
  ASSERT (vm->heap_base);

  unformat_init_command_line (&input, (char **) vm->argv);
  if ((e = vlib_plugin_config (vm, &input)))
    {
      clib_error_report (e);
      return 1;
    }
  unformat_free (&input);

  i = vlib_plugin_early_init (vm);
  if (i)
    return i;

  unformat_init_command_line (&input, (char **) vm->argv);
  if (vm->init_functions_called == 0)
    vm->init_functions_called = hash_create (0, /* value bytes */ 0);
  e = vlib_call_all_config_functions (vm, &input, 1 /* early */ );
  if (e != 0)
    {
      clib_error_report (e);
      return 1;
    }
  unformat_free (&input);

  /* always load symbols, for signal handler and mheap memory get/put backtrace */
  clib_elf_main_init (vm->name);

  vlib_thread_stack_init (0);

  __os_thread_index = 0;
  vm->thread_index = 0;

  i = clib_calljmp (thread0, (uword) vm,
		    (void *) (vlib_thread_stacks[0] +
			      VLIB_THREAD_STACK_SIZE));
  return i;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */