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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 Library 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public
License along with LibGTop; see the file COPYING.LIB. If not, write
to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <glibtop.h>
#include <glibtop/cpu.h>
#include <glibtop/open.h>
/* =====================================================
* Linux kernel version information for procps utilities
* Copyright (c) 1996 Charles Blake <cblake@bbn.com>
*/
#include <sys/utsname.h>
#define LINUX_VERSION(x,y,z) (0x10000*(x) + 0x100*(y) + z)
static int linux_version_code = 0;
static void set_linux_version(void) {
static struct utsname uts;
int x = 0, y = 0, z = 0; /* cleared in case sscanf() < 3 */
if (linux_version_code) return;
if (uname(&uts) == -1) /* failure most likely implies impending death */
exit(1);
if (sscanf(uts.release, "%d.%d.%d", &x, &y, &z) < 3)
fprintf(stderr, /* *very* unlikely to happen by accident */
"Non-standard uts for running kernel:\n"
"release %s=%d.%d.%d gives version code %d\n",
uts.release, x, y, z, LINUX_VERSION(x,y,z));
linux_version_code = LINUX_VERSION(x, y, z);
}
/* ======================================================= */
/* Opens pipe to gtop server. Returns 0 on success and -1 on error. */
#define FILENAME "/proc/stat"
void
glibtop_open_s (glibtop *server, const char *program_name,
const unsigned long features,
const unsigned flags)
{
char buffer [BUFSIZ], *p;
int fd, len, i;
server->name = program_name;
set_linux_version ();
server->os_version_code = (unsigned long) linux_version_code;
server->ncpu = 0;
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';
p = skip_multiple_token (buffer, 5) + 1;
for (i = 0; i < GLIBTOP_NCPU; i++) {
if (strncmp (p, "cpu", 3) || !isdigit (p [3]))
break;
server->ncpu++;
p = skip_multiple_token (p, 5) + 1;
}
#if DEBUG
printf ("\nThis machine has %d CPUs.\n\n", server->ncpu);
#endif
}
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