/* 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 <sys/vminfo.h>

#include <glibtop.h>

#include <glibtop/error.h>

#include <glibtop/swap.h>

static const unsigned long _glibtop_sysdeps_swap =

(1 << GLIBTOP_SWAP_TOTAL) + (1 << GLIBTOP_SWAP_USED) +

(1 << GLIBTOP_SWAP_FREE) + (1 << GLIBTOP_SWAP_PAGEIN) +

(1 << GLIBTOP_SWAP_PAGEOUT);

#define FILENAME	"/etc/swapspaces"

/* Init function. */

void

_glibtop_init_swap_s (glibtop *server)

{

	server->sysdeps.swap = _glibtop_sysdeps_swap;

}

/* Provides information about swap usage. */

void

glibtop_get_swap_s (glibtop *server, glibtop_swap *buf)

{

	struct vminfo vminfo;

	struct pginfo pginfo;

	int pagesize;

	int result;

	FILE* fd;

	char device_name[128];

	int c;

	int comment = 0;

	int pos = 0;

	glibtop_init_s (&server, (1L << GLIBTOP_SYSDEPS_SWAP), 0);

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

	pagesize = sysconf(_SC_PAGESIZE);

	fd = fopen(FILENAME, "r");

	if (fd == NULL)

	{

		glibtop_error_io_r (server, "open (%s)", FILENAME);

	}

	buf->total = 0;

	buf->free = 0;

	while((c = getc(fd)) != EOF)

	{

		if (comment)

		{

			/* skip comments */

			if (c == '\n') comment = 0;

			continue;

		}

		switch(c)

		{

			case '*':

				comment = 1;

				break;

			case '\n':

				device_name[pos] = 0;

				pos = 0;

				if (strncmp("dev=", device_name, 4) == 0)

				{

					result = swapqry(device_name+4, &pginfo);

					if (result == -1)

					{

						glibtop_error_io_r (server, "Cannot read pginfo");

						break;

					}

					buf->total += pginfo.size * pagesize;

					buf->free += pginfo.free * pagesize;;

				}

				break;

			case ' ':

			case '\t':

				break;

			default:

				device_name[pos++] = c;

				break;

		}

	}

	buf->used = buf->total - buf->free;

	fclose(fd);

#ifdef HAVE_VMGETINFO

	result = vmgetinfo((void*)&vminfo, VMINFO, sizeof(vminfo));

#else

	result = _glibtop_vmgetinfo((void*)&vminfo, VMINFO, sizeof(vminfo));

#endif

	if (result == -1)

	{

		glibtop_error_io_r (server, "Cannot read vminfo");

		return;

	}

	buf->pagein = vminfo.pageins;

	buf->pageout = vminfo.pageouts;

	buf->flags = _glibtop_sysdeps_swap;

}