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/* $Id$ */
/* 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <glibtop/error.h>
#include <glibtop/loadavg.h>
static const unsigned long _glibtop_sysdeps_loadavg =
(1L << GLIBTOP_LOADAVG_LOADAVG);
static const unsigned long _glibtop_sysdeps_loadavg_tasks =
(1L << GLIBTOP_LOADAVG_NR_RUNNING) +
(1L << GLIBTOP_LOADAVG_NR_TASKS) +
(1L << GLIBTOP_LOADAVG_LAST_PID);
/* Init function. */
void
glibtop_init_loadavg_s (glibtop *server)
{
server->sysdeps.loadavg = _glibtop_sysdeps_loadavg;
}
/* Provides load load averange. */
#define FILENAME "/proc/loadavg"
void
glibtop_get_loadavg_s (glibtop *server, glibtop_loadavg *buf)
{
char buffer [BUFSIZ], *p, *old;
int fd, len;
glibtop_init_s (&server, GLIBTOP_SYSDEPS_LOADAVG, 0);
memset (buf, 0, sizeof (glibtop_loadavg));
fd = open (FILENAME, O_RDONLY);
if (fd < 0)
glibtop_error_io_r (server, "open (%s)", FILENAME);
len = read (fd, buffer, BUFSIZ-1);
if (len < 0)
glibtop_error_io_r (server, "read (%s)", FILENAME);
close (fd);
buffer [len] = '\0';
buf->loadavg [0] = strtod (buffer, &p);
buf->loadavg [1] = strtod (p, &p);
buf->loadavg [2] = strtod (p, &p);
buf->flags = _glibtop_sysdeps_loadavg;
while (isspace(*p)) p++;
/* Older Linux versions don't have the nr_running/nr_tasks fields. */
old = p;
while (*p) {
if (*p == '/')
break;
if (!isdigit (*p))
return;
p++;
}
buf->nr_running = strtoull (old, &p, 0); p++;
buf->nr_tasks = strtoull (p, &p, 0);
buf->last_pid = strtoull (p, &p, 0);
buf->flags |= _glibtop_sysdeps_loadavg_tasks;
}
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