/* 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/proclist.h>

#include <glibtop_suid.h>

static const unsigned long _glibtop_sysdeps_proclist =

(1 << GLIBTOP_PROCLIST_TOTAL) + (1 << GLIBTOP_PROCLIST_NUMBER) +

(1 << GLIBTOP_PROCLIST_SIZE);

/* Fetch list of currently running processes.

 *

 * IMPORTANT NOTE:

 *   On error, this function MUST return NULL and set buf->flags to zero !

 *   On success, it returnes a pointer to a list of buf->number elements

 *   each buf->size big. The total size is stored in buf->total. */

unsigned *

glibtop_get_proclist_p (glibtop *server, glibtop_proclist *buf,

			gint64 which, gint64 arg)

{

	register struct proc *pp;

	register int i, nproc = 0;

	unsigned *proc_list = NULL;

	size_t proc_size;

	glibtop_init_p (server, (1 << GLIBTOP_SYSDEPS_PROCLIST), 0);

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

	/* Read process table from kernel. */

	_glibtop_read_proc_table (server);

	/* Count number of processes. */

	for (pp = server->machine->proc_table, i = 0;

	     i < server->machine->nproc; pp++, i++) {

		if (pp->p_stat == 0)

			continue;

		else

			nproc++;

	}

	if (nproc == 0) /* Should never happen. */

		return NULL;

	/* Allocate space for process list. */

	proc_size = nproc * sizeof (unsigned);

	proc_list = g_malloc (proc_size);

	/* Write process list. */

	for (pp = server->machine->proc_table, i = 0, nproc = 0;

	     i < server->machine->nproc; pp++, i++) {

		if (pp->p_stat == 0)

			continue;

		proc_list [nproc++] = pp->p_pid;

	}

	/* Since everything is ok now, we can set buf->flags, fill in the remaining fields

	   and return proc_list. */

	buf->flags = _glibtop_sysdeps_proclist;

	buf->size = sizeof (unsigned);

	buf->number = nproc;

	buf->total = nproc * sizeof (unsigned);

	return proc_list;

}