/*
* Copyright (c) 1984 through 2008, William LeFebvre
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*     * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
*     * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
*     * Neither the name of William LeFebvre nor the names of other
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
*  Top users/processes display for Unix
*  Version 3
*/

/*
*  This file contains the routines that implement some of the interactive
*  mode commands.  Note that some of the commands are implemented in-line
*  in "main".  This is necessary because they change the global state of
*  "top" (i.e.:  changing the number of processes to display).
*/

#include "os.h"
#include <ctype.h>
#include <signal.h>
#include <stdarg.h>
#include <unistd.h>
#include <color.h>
#include <errno.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif

#if defined(HAVE_DECL_SYS_SIGLIST) & defined(HAVE_STRCASECMP)
#define USE_SYS_SIGLIST
#endif

#ifdef USE_SYS_SIGLIST
extern const char * const sys_siglist[];
extern const char * const sys_signame[];
#else
#include "sigdesc.h"            /* generated automatically */
#endif
#include "top.h"
#include "machine.h"
#include "globalstate.h"
#include "boolean.h"
#include "color.h"
#include "commands.h"
#include "display.h"
#include "screen.h"
#include "username.h"
#include "utils.h"
#include "version.h"

extern char *copyright;

typedef struct command {
   int ch;
   int (*cmd_func)(globalstate *);
   const char *help;
} command;

/*
*  Some of the commands make system calls that could generate errors.
*  These errors are collected up in an array of structures for later
*  contemplation and display.  Such routines return a string containing an
*  error message, or NULL if no errors occurred.  We need an upper limit on
*  the number of errors, so we arbitrarily choose 20.
*/

#define ERRMAX 20

struct errs             /* structure for a system-call error */
{
   int  errnum;        /* value of errno (that is, the actual error) */
   char *arg;          /* argument that caused the error */
};

static struct errs errs[ERRMAX];
static int errcnt;

/* These macros get used to reset and log the errors */
#define ERR_RESET   errcnt = 0
#define ERROR(p, e) if (errcnt < ERRMAX) \
                   { \
                       errs[errcnt].arg = (p); \
                       errs[errcnt++].errnum = (e); \
                   }

/*
*  err_compar(p1, p2) - comparison routine used by "qsort"
*      for sorting errors.
*/

static int
err_compar(const void *p1, const void *p2)

{
   register int result;

   if ((result = ((const struct errs *)p1)->errnum -
        ((const struct errs *)p2)->errnum) == 0)
   {
       return(strcmp(((const struct errs *)p1)->arg,
                     ((const struct errs *)p2)->arg));
   }
   return(result);
}

/*
*  str_adderr(str, len, err) - add an explanation of error "err" to
*      the string "str" without overflowing length "len".  return
*      number of characters remaining in str, or 0 if overflowed.
*/

static int
str_adderr(char *str, int len, int err)

{
   register const char *msg;
   register int  msglen;

   msg = err == 0 ? "Not a number" : errmsg(err);
   msglen = strlen(msg) + 2;
   if (len <= msglen)
   {
       return(0);
   }
   (void) strcat(str, ": ");
   (void) strcat(str, msg);
   return(len - msglen);
}

/*
*  str_addarg(str, len, arg, first) - add the string argument "arg" to
*      the string "str" without overflowing length "len".  This is the
*      first in the group when "first" is set (indicating that a comma
*      should NOT be added to the front).  Return number of characters
*      remaining in str, or 0 if overflowed.
*/

static int
str_addarg(char *str, int len, char *arg, int first)

{
   register int arglen;

   arglen = strlen(arg);
   if (!first)
   {
       arglen += 2;
   }
   if (len <= arglen)
   {
       return(0);
   }
   if (!first)
   {
       (void) strcat(str, ", ");
   }
   (void) strcat(str, arg);
   return(len - arglen);
}

/*
* void err_string()
*
* Use message_error to log errors in the errs array.  This function
* will combine identical errors to make the message short, but if
* there is more than one type of error it will call message_error
* for each one.
*/

#define STRMAX 80

static void
err_string(void)

{
   register struct errs *errp;
   register int  cnt = 0;
   register int  first = Yes;
   register int  currerr = -1;
   int stringlen = 0;          /* characters still available in "string" */
   char string[STRMAX];

   /* if there are no errors, our job is easy */
   if (errcnt == 0)
   {
       return;
   }

   /* sort the errors */
   qsort((char *)errs, errcnt, sizeof(struct errs), err_compar);

   /* initialize the buffer (probably not necessary) */
   string[0] = '\0';
   stringlen = STRMAX - 1;

   /* loop thru the sorted list, logging errors */
   while (cnt < errcnt)
   {
       /* point to the current error */
       errp = &(errs[cnt++]);

       /* note that on overflow "stringlen" will become 0 and all
          subsequent calls to str_addarg or str_adderr will return 0 */

       /* if the error number is different then add the error string */
       if (errp->errnum != currerr)
       {
           if (currerr != -1)
           {
               /* add error string and log the error */
               stringlen = str_adderr(string, stringlen, currerr);
               message_error(" %s", string);

           }
           /* reset the buffer */
           string[0] = '\0';
           stringlen = STRMAX - 1;

           /* move to next error num */
           currerr = errp->errnum;
           first = Yes;
       }

       /* add this arg */
       stringlen = str_addarg(string, stringlen, errp->arg, first);
       first = No;
   }

   /* add final message */
   stringlen = str_adderr(string, stringlen, currerr);

   /* write the error string */
   message_error(" %s", string);
}

/*
*  Utility routines that help with some of the commands.
*/

static char *
next_field(char *str)


{
   if ((str = strchr(str, ' ')) == NULL)
   {
       return(NULL);
   }
   *str = '\0';
   while (*++str == ' ') /* loop */;

   /* if there is nothing left of the string, return NULL */
   /* This fix is dedicated to Greg Earle */
   return(*str == '\0' ? NULL : str);
}

static int
scanint(char *str, int *intp)

{
   register int val = 0;
   register int ch;

   /* if there is nothing left of the string, flag it as an error */
   /* This fix is dedicated to Greg Earle */
   if (*str == '\0')
   {
       return(-1);
   }

   while ((ch = *str++) != '\0')
   {
       if (isdigit(ch))
       {
           val = val * 10 + (ch - '0');
       }
       else if (isspace(ch))
       {
           break;
       }
       else
       {
           return(-1);
       }
   }
   *intp = val;
   return(0);
}

#ifdef notdef
/*
*  error_count() - return the number of errors currently logged.
*/

static int
error_count(void)

{
   return(errcnt);
}

/*
*  show_errors() - display on stdout the current log of errors.
*/

static void
show_errors(void)

{
   register int cnt = 0;
   register struct errs *errp = errs;

   printf("%d error%s:\n\n", errcnt, errcnt == 1 ? "" : "s");
   while (cnt++ < errcnt)
   {
       printf("%5s: %s\n", errp->arg,
           errp->errnum == 0 ? "Not a number" : errmsg(errp->errnum));
       errp++;
   }
}
#endif

/*
*  kill_procs(str) - send signals to processes, much like the "kill"
*              command does; invoked in response to 'k'.
*/

static void
kill_procs(char *str)

{
   register char *nptr;
   int signum = SIGTERM;       /* default */
   int procnum;
   int uid;
   int owner;
#ifndef USE_SYS_SIGLIST
   struct sigdesc *sigp;
#endif

   /* reset error array */
   ERR_RESET;

   /* remember our uid */
   uid = getuid();

   /* skip over leading white space */
   while (isspace((int)*str)) str++;

   if (str[0] == '-')
   {
       /* explicit signal specified */
       if ((nptr = next_field(str)) == NULL)
       {
           message_error(" kill: no processes specified");
           return;
       }

       str++;
       if (isdigit((int)str[0]))
       {
           (void) scanint(str, &signum);
           if (signum <= 0 || signum >= NSIG)
           {
               message_error(" kill: invalid signal number");
               return;
           }
       }
       else
       {
           /* translate the name into a number */
#ifdef USE_SYS_SIGLIST
           for (signum = 1; signum < NSIG; signum++)
           {
               if (strcasecmp(sys_signame[signum], str) == 0)
               {
                   break;
               }
           }
           if (signum == NSIG)
           {
               message_error(" kill: bad signal name");
               return;
           }
#else
           for (sigp = sigdesc; sigp->name != NULL; sigp++)
           {
#ifdef HAVE_STRCASECMP
               if (strcasecmp(sigp->name, str) == 0)
#else
               if (strcmp(sigp->name, str) == 0)
#endif
               {
                   signum = sigp->number;
                   break;
               }
           }

           /* was it ever found */
           if (sigp->name == NULL)
           {
               message_error(" kill: bad signal name");
               return;
           }
#endif
       }
       /* put the new pointer in place */
       str = nptr;
   }

   /* loop thru the string, killing processes */
   do
   {
       if (scanint(str, &procnum) == -1)
       {
           ERROR(str, 0);
       }
       else
       {
           /* check process owner if we're not root */
           owner = proc_owner(procnum);
           if (uid && (uid != owner))
           {
               ERROR(str, owner == -1 ? ESRCH : EACCES);
           }
           /* go in for the kill */
           else if (kill(procnum, signum) == -1)
           {
               /* chalk up an error */
               ERROR(str, errno);
           }
       }
   } while ((str = next_field(str)) != NULL);

   /* process errors */
   err_string();
}

/*
*  renice_procs(str) - change the "nice" of processes, much like the
*              "renice" command does; invoked in response to 'r'.
*/

static void
renice_procs(char *str)

{
   register char negate;
   int prio;
   int procnum;
   int uid;

   ERR_RESET;
   uid = getuid();

   /* allow for negative priority values */
   if ((negate = (*str == '-')) != 0)
   {
       /* move past the minus sign */
       str++;
   }

   /* use procnum as a temporary holding place and get the number */
   procnum = scanint(str, &prio);

   /* negate if necessary */
   if (negate)
   {
       prio = -prio;
   }

#if defined(PRIO_MIN) && defined(PRIO_MAX)
   /* check for validity */
   if (procnum == -1 || prio < PRIO_MIN || prio > PRIO_MAX)
   {
       message_error(" renice: bad priority value");
       return;
   }
#endif

   /* move to the first process number */
   if ((str = next_field(str)) == NULL)
   {
       message_error(" renice: no processes specified");
       return;
   }

#ifdef HAVE_SETPRIORITY
   /* loop thru the process numbers, renicing each one */
   do
   {
       if (scanint(str, &procnum) == -1)
       {
           ERROR(str, 0);
       }

       /* check process owner if we're not root */
       else if (uid && (uid != proc_owner(procnum)))
       {
           ERROR(str, EACCES);
       }
       else if (setpriority(PRIO_PROCESS, procnum, prio) == -1)
       {
           ERROR(str, errno);
       }
   } while ((str = next_field(str)) != NULL);
   err_string();
#else
   message_error(" renice operation not supported");
#endif
}

/* COMMAND ROUTINES */

/*
* Each command routine is called by command_process and is passed a
* pointer to the current global state.  Command routines are free
* to change anything in the global state, although changes to the
* statics structure are discouraged.  Whatever a command routine
* returns will be returned by command_process.
*/

static void
cmd_quit(globalstate *gstate)

{
   quit(EX_OK);
   /*NOTREACHED*/
}

static int
cmd_update(globalstate *gstate)

{
   /* go home for visual feedback */
   screen_home();
   fflush(stdout);
   message_expire();
   return CMD_REFRESH;
}

static int
cmd_redraw(globalstate *gstate)

{
   gstate->fulldraw = Yes;
   return CMD_REFRESH;
}

static int
cmd_color(globalstate *gstate)

{
   gstate->use_color = color_activate(-1);
   gstate->fulldraw = Yes;
   return CMD_REFRESH;
}

static int
cmd_number(globalstate *gstate)

{
   int newval;
   char tmpbuf[20];

   message_prompt("Number of processes to show: ");
   newval = readline(tmpbuf, 8, Yes);
   if (newval > -1)
   {
       if (newval > gstate->max_topn)
       {
           message_error(" This terminal can only display %d processes",
                         gstate->max_topn);
       }

       if (newval == 0)
       {
           /* inhibit the header */
           display_header(No);
       }

       else if (gstate->topn == 0)
       {
           display_header(Yes);
       }

       gstate->topn = newval;
   }
   return CMD_REFRESH;
}

static int
cmd_delay(globalstate *gstate)

{
   double newval;
   char tmpbuf[20];

   message_prompt("Seconds to delay: ");
   if (readline(tmpbuf, 8, No) > 0)
   {
       newval = atof(tmpbuf);
       if (newval == 0 && getuid() != 0)
       {
           gstate->delay = 1;
       }
       else
       {
           gstate->delay = newval;
       }
   }
   return CMD_REFRESH;
}

static int
cmd_idle(globalstate *gstate)

{
   gstate->pselect.idle = !gstate->pselect.idle;
   message_error(" %sisplaying idle processes.",
                 gstate->pselect.idle ? "D" : "Not d");
   return CMD_REFRESH;
}

static int
cmd_displays(globalstate *gstate)

{
   int i;
   char tmpbuf[20];

   message_prompt("Displays to show (currently %s): ",
                  gstate->displays == -1 ? "infinite" :
                  itoa(gstate->displays));

   if ((i = readline(tmpbuf, 10, Yes)) > 0)
   {
       gstate->displays = i;
   }
   else if (i == 0)
   {
       quit(EX_OK);
       /*NOTREACHED*/
   }
   return CMD_OK;
}

static int
cmd_cmdline(globalstate *gstate)

{
   if (gstate->statics->flags.fullcmds)
   {
       gstate->pselect.fullcmd = !gstate->pselect.fullcmd;
       message_error(" %sisplaying full command lines.",
                     gstate->pselect.fullcmd ? "D" : "Not d");
       return CMD_REFRESH;
   }
   message_error(" Full command display not supported.");
   return CMD_OK;
}

static int
cmd_order(globalstate *gstate)

{
   char tmpbuf[MAX_COLS];
   int i;

   if (gstate->statics->order_names != NULL)
   {
       message_prompt("Column to sort: ");
       if (readline(tmpbuf, sizeof(tmpbuf), No) > 0)
       {
           if ((i = string_index(tmpbuf, gstate->statics->order_names)) == -1)
           {
               message_error(" Sort order \"%s\" not recognized", tmpbuf);
           }
           else
           {
               gstate->order_index = i;
               return CMD_REFRESH;
           }
       }
   }
   return CMD_OK;
}

static int
cmd_order_x(globalstate *gstate, const char *name, ...)

{
   va_list ap;
   char *p;
   const char **names;
   int i;

   names = gstate->statics->order_names;
   if (names != NULL)
   {
       if ((i = string_index(name, names)) == -1)
       {
           /* check the alternate list */
           va_start(ap, name);
           p = va_arg(ap, char *);
           while (p != NULL)
           {
               if ((i = string_index(p, names)) != -1)
               {
                   gstate->order_index = i;
                   return CMD_REFRESH;
               }
               p = va_arg(ap, char *);
           }
           message_error(" Sort order not recognized");
       }
       else
       {
           gstate->order_index = i;
           return CMD_REFRESH;
       }
   }
   return CMD_OK;
}

static int
cmd_order_cpu(globalstate *gstate)

{
   return cmd_order_x(gstate, "cpu", NULL);
}

static int
cmd_order_pid(globalstate *gstate)

{
   return cmd_order_x(gstate, "pid", NULL);
}

static int
cmd_order_mem(globalstate *gstate)

{
   return cmd_order_x(gstate, "mem", "size", NULL);
}

static int
cmd_order_time(globalstate *gstate)

{
   return cmd_order_x(gstate, "time");
}

#ifdef ENABLE_KILL

static int
cmd_kill(globalstate *gstate)

{
   char tmpbuf[MAX_COLS];

   message_prompt_plain("kill ");
   if (readline(tmpbuf, sizeof(tmpbuf), No) > 0)
   {
       kill_procs(tmpbuf);
   }
   return CMD_OK;
}

static int
cmd_renice(globalstate *gstate)

{
   char tmpbuf[MAX_COLS];

   message_prompt_plain("renice ");
   if (readline(tmpbuf, sizeof(tmpbuf), No) > 0)
   {
       renice_procs(tmpbuf);
   }
   return CMD_OK;
}

#endif

static int
cmd_pid(globalstate *gstate)

{
   char tmpbuf[MAX_COLS];

   message_prompt_plain("select pid ");
   gstate->pselect.pid = -1;
   if (readline(tmpbuf, sizeof(tmpbuf), No) > 0)
   {
       int pid;
       if (scanint(tmpbuf, &pid) == 0)
           gstate->pselect.pid = pid;
   }
   return CMD_OK;
}

static int
cmd_user(globalstate *gstate)

{
   char linebuf[MAX_COLS];
   int i;
   int ret = CMD_OK;

   message_prompt("Username to show: ");
   if (readline(linebuf, sizeof(linebuf), No) > 0)
   {
       if (linebuf[0] == '+' &&
           linebuf[1] == '\0')
       {
           gstate->pselect.uid = -1;
           ret = CMD_REFRESH;
       }
       else if ((i = userid(linebuf)) == -1)
       {
           message_error(" %s: unknown user", linebuf);
       }
       else
       {
           gstate->pselect.uid = i;
           ret = CMD_REFRESH;
       }
   }
   return ret;
}

static int
cmd_command(globalstate *gstate)

{
   char linebuf[MAX_COLS];

   if (gstate->pselect.command != NULL)
   {
       free(gstate->pselect.command);
       gstate->pselect.command = NULL;
   }

   message_prompt("Command to show: ");
   if (readline(linebuf, sizeof(linebuf), No) > 0)
   {
       if (linebuf[0] != '\0')
       {
           gstate->pselect.command = estrdup(linebuf);
       }
   }
   return CMD_REFRESH;
}

static int
cmd_useruid(globalstate *gstate)

{
   gstate->pselect.usernames = !gstate->pselect.usernames;
   display_header(2);
   return CMD_REFRESH;
}

static int
cmd_mode(globalstate *gstate)

{
   if (gstate->statics->modemax <= 1)
   {
       return CMD_NA;
   }
   gstate->pselect.mode = (gstate->pselect.mode + 1) % gstate->statics->modemax;
   display_header(2);
   return CMD_REFRESH;
}

static int
cmd_system(globalstate *gstate)

{
   gstate->pselect.system = !gstate->pselect.system;
   display_header(2);
   return CMD_REFRESH;
}

static int
cmd_threads(globalstate *gstate)

{
   if (gstate->statics->flags.threads)
   {
       gstate->pselect.threads = !gstate->pselect.threads;
       display_header(2);
       return CMD_REFRESH;
   }
   return CMD_NA;
}

static int
cmd_percpustates(globalstate *gstate)
{
       gstate->percpustates = !gstate->percpustates;
       gstate->fulldraw = Yes;
       gstate->max_topn += display_setmulti(gstate->percpustates);
       return CMD_REFRESH;
}


/* forward reference for cmd_help, as it needs to see the command_table */
int cmd_help(globalstate *gstate);

/* command table */
command command_table[] = {
   { '\014', cmd_redraw, "redraw screen" },
   { ' ', cmd_update, "update screen" },
   { '?', cmd_help, "help; show this text" },
   { 'h', cmd_help, NULL },
   { '1', cmd_percpustates, "toggle the display of cpu states per cpu" },
   { 'C', cmd_color, "toggle the use of color" },
   { 'H', cmd_threads, "toggle the display of individual threads" },
   { 't', cmd_threads, NULL },
   { 'M', cmd_order_mem, "sort by memory usage" },
   { 'N', cmd_order_pid, "sort by process id" },
   { 'P', cmd_order_cpu, "sort by CPU usage" },
   { 'S', cmd_system, "toggle the display of system processes" },
   { 'T', cmd_order_time, "sort by CPU time" },
   { 'U', cmd_useruid, "toggle the display of usernames or uids" },
   { 'c', cmd_command, "display processes by command name" },
   { 'd', cmd_displays, "change number of displays to show" },
   { 'f', cmd_cmdline, "toggle the display of full command paths" },
   { 'i', cmd_idle, "toggle the displaying of idle processes" },
   { 'I', cmd_idle, NULL },
#ifdef ENABLE_KILL
   { 'k', cmd_kill, "kill processes; send a signal to a list of processes" },
#endif
   { 'm', cmd_mode, "toggle between display modes" },
   { 'n', cmd_number, "change number of processes to display" },
   { '#', cmd_number, NULL },
   { 'o', cmd_order, "specify sort order (see below)" },
   { 'p', cmd_pid, "select a single pid" },
   { 'q', (int (*)(globalstate *))cmd_quit, "quit" },
#ifdef ENABLE_KILL
   { 'r', cmd_renice, "renice a process" },
#endif
   { 's', cmd_delay, "change number of seconds to delay between updates" },
   { 'u', cmd_user, "display processes for only one user (+ selects all users)" },
   { '\0', NULL, NULL },
};

int
cmd_help(globalstate *gstate)

{
   command *c;
   char buf[12];
   char *p;
   const char *help;

   display_pagerstart();

   display_pager("Top version %s, %s\n", version_string(), copyright);
   display_pager("Platform module: %s\n\n", MODULE);
   display_pager("A top users display for Unix\n\n");
   display_pager("These single-character commands are available:\n\n");

   c = command_table;
   while (c->cmd_func != NULL)
   {
       /* skip null help strings */
       if ((help = c->help) == NULL)
       {
           continue;
       }

       /* translate character in to something readable */
       if (c->ch < ' ')
       {
           buf[0] = '^';
           buf[1] = c->ch + '@';
           buf[2] = '\0';
       }
       else if (c->ch == ' ')
       {
           strcpy(buf, "<sp>");
       }
       else
       {
           buf[0] = c->ch;
           buf[1] = '\0';
       }

       /* if the next command is the same, fold them onto one line */
       if ((c+1)->cmd_func == c->cmd_func)
       {
           strcat(buf, " or ");
           p = buf + strlen(buf);
           *p++ = (c+1)->ch;
           *p = '\0';
           c++;
       }

       display_pager("%-7s - %s\n", buf, help);
       c++;
   }

   display_pager("\nNot all commands are available on all systems.\n\n");
   display_pager("Available sort orders: %s\n", gstate->order_namelist);
   display_pagerend();
   gstate->fulldraw = Yes;
   return CMD_REFRESH;
}

/*
* int command_process(globalstate *gstate, int cmd)
*
* Process the single-character command "cmd".  The global state may
* be modified by the command to alter the output.  Returns CMD_ERROR
* if there was a serious error that requires an immediate exit, CMD_OK
* to indicate success, CMD_REFRESH to indicate that the screen needs
* to be refreshed immediately, CMD_UNKNOWN when the command is not known,
* and CMD_NA when the command is not available.  Error messages for
* CMD_NA and CMD_UNKNOWN must be handled by the caller.
*/

int
command_process(globalstate *gstate, int cmd)

{
   command *c;

   c = command_table;
   while (c->cmd_func != NULL)
   {
       if (c->ch == cmd)
       {
           return (c->cmd_func)(gstate);
       }
       c++;
   }

   return CMD_UNKNOWN;
}

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