efaaf6eb77
From: Jason Xing <xinggang861@gmail.com> In 'Bug 323354 - Support a dynamic number of CPUs', there will be a solution which can dynamically allocate memory for large number of CPUs. As libgtop supports multiple operating systems, this work may take some time. This patch is a temporary patch, which worked before the whole solution comes out. It only supports linux platform with CPU number up to 1024. There are two Macroes which limit the statistics of CPU. One is GLIBTOP_NCPU. The other is a buffer size. This buffer used to read /proc/stat contents into. https://bugzilla.gnome.org/show_bug.cgi?id=323354 https://bugzilla.gnome.org/show_bug.cgi?id=681632
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* Copyright (C) 1998-99 Martin Baulig
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This file is part of LibGTop 1.0.
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Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
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LibGTop is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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LibGTop is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with LibGTop; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <glibtop.h>
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#include <glibtop/cpu.h>
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#include <glibtop/open.h>
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#include <glibtop/error.h>
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#include "glibtop_private.h"
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/* =====================================================
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* Linux kernel version information for procps utilities
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* Copyright (c) 1996 Charles Blake <cblake@bbn.com>
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*/
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#include <sys/utsname.h>
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static void set_linux_version(glibtop *server)
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{
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struct utsname uts;
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unsigned x = 0, y = 0, z = 0; /* cleared in case sscanf() < 3 */
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if (uname(&uts) == -1) /* failure most likely implies impending death */
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glibtop_error_r(server, "uname() failed");
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if (sscanf(uts.release, "%u.%u.%u", &x, &y, &z) < 3)
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glibtop_warn_r(server,
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"Non-standard uts for running kernel:\n"
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"release %s=%u.%u.%u gives version code %d\n",
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uts.release, x, y, z, LINUX_VERSION_CODE(x,y,z));
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if (LINUX_VERSION_CODE(x, y, z) >= LINUX_VERSION_CODE(2, 6, 0)
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&& !has_sysfs())
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glibtop_warn_r(server,
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"You're running a 2.6 kernel without /sys."
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"You should mount it.");
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server->os_version_code = LINUX_VERSION_CODE(x, y, z);
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}
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/* ======================================================= */
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/* Opens pipe to gtop server. Returns 0 on success and -1 on error. */
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#define FILENAME "/proc/stat"
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#define STAT_BUFSIZ 81920
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void
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glibtop_open_s (glibtop *server, const char *program_name,
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const unsigned long features,
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const unsigned flags)
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{
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char buffer [STAT_BUFSIZ], *p = buffer;
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server->name = program_name;
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set_linux_version(server);
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file_to_buffer(server, buffer, sizeof buffer, FILENAME);
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p = skip_line(p); /* cpu */
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for (server->real_ncpu = 0; /* nop */; server->real_ncpu++) {
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if (!check_cpu_line(server, p, server->real_ncpu)) {
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server->real_ncpu--;
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break;
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}
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p = skip_line(p);
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}
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server->ncpu = MIN(GLIBTOP_NCPU - 1, server->real_ncpu);
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if (server->real_ncpu != server->ncpu) {
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glibtop_warn_r(server,
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"This machine has %d CPUs, "
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"%d are being monitored.",
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server->real_ncpu + 1,
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server->ncpu + 1);
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}
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}
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