/* Copyright (C) 1998-99 Martin Baulig

   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.

   LibGTop is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License,

   or (at your option) any later version.

   LibGTop is distributed in the hope that it will be useful, but WITHOUT

   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

   for more details.

   You should have received a copy of the GNU General Public License

   along with LibGTop; see the file COPYING. If not, write to the

   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

   Boston, MA 02110-1301, USA.

*/

#include <config.h>

#include <glibtop.h>

#include <glibtop/error.h>

#include <glibtop/procstate.h>

#include "glibtop_private.h"

#include <sys/stat.h>

static const unsigned long _glibtop_sysdeps_proc_state =

(1L << GLIBTOP_PROC_STATE_CMD) + (1L << GLIBTOP_PROC_STATE_STATE);

static const unsigned long _glibtop_sysdeps_proc_state_uid =

(1L << GLIBTOP_PROC_STATE_UID) + (1L << GLIBTOP_PROC_STATE_GID);

/* Init function. */

void

_glibtop_init_proc_state_s (glibtop *server)

{

	server->sysdeps.proc_state = _glibtop_sysdeps_proc_state |

		_glibtop_sysdeps_proc_state_uid;

}

/* Provides detailed information about a process. */

void

glibtop_get_proc_state_s (glibtop *server, glibtop_proc_state *buf, pid_t pid)

{

	char buffer [BUFSIZ], *p;

	struct stat statb;

	memset (buf, 0, sizeof (glibtop_proc_state));

	/* IMPORTANT NOTICE: For security reasons it is extremely important

	 *                   that the 'uid' and 'gid' fields have correct

	 *                   values; NEVER set their flags values if this

	 *                   is not the case !!! */

	sprintf (buffer, "/proc/%d", pid);

	if (stat (buffer, &statb))

		return;

	/* For security reasons we use stat () since it is

	 * more failsafe than parsing the file. */

	buf->uid = statb.st_uid;

	buf->gid = statb.st_gid;

	buf->flags = _glibtop_sysdeps_proc_state_uid;

	/* Now we read the remaining fields. */

	if (proc_stat_to_buffer(buffer, sizeof buffer, pid))

		return;

	p = proc_stat_after_cmd(buffer);

	p = next_token(p);

	switch(*p)

	  {

	  case 'R':

	    buf->state = GLIBTOP_PROCESS_RUNNING;

	    break;

	  case 'Z':

	    buf->state = GLIBTOP_PROCESS_ZOMBIE;

	    break;

	  case 'S':

	    buf->state = GLIBTOP_PROCESS_INTERRUPTIBLE;

	    break;

	  case 'T':

	    buf->state = GLIBTOP_PROCESS_STOPPED;

	    break;

	  case 'D':

	    buf->state = GLIBTOP_PROCESS_UNINTERRUPTIBLE;

	    break;

	  case 'W':

	    buf->state = GLIBTOP_PROCESS_SWAPPING;

	    break;

	  case 'X':

	    buf->state = GLIBTOP_PROCESS_DEAD;

	    break;

	  }

	p = skip_multiple_token (p, 36);

	buf->last_processor = atoi (p);

	p = skip_token (buffer); /* pid */

	if (G_UNLIKELY(*p++ != '('))

		glibtop_error_r (server, "Bad data in /proc/%d/stat", pid);

	g_strlcpy (buf->cmd, p, sizeof buf->cmd);

	buf->flags |= _glibtop_sysdeps_proc_state;

}