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/* $OpenBSD: cpu.c,v 1.10 2019/06/28 13:35:04 deraadt Exp $ */
/*
* Copyright (c) 2013 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2001, 2007 Can Erkin Acar <canacar@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* CPU percentages() function from usr.bin/top/util.c:
*
* Top users/processes display for Unix
* Version 3
*
* Copyright (c) 1984, 1989, William LeFebvre, Rice University
* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/signal.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include "systat.h"
void print_cpu(void);
int read_cpu(void);
int select_cpu(void);
static void cpu_info(void);
static void print_fld_percentage(field_def *, double);
static int percentages(int, int64_t *, int64_t *, int64_t *, int64_t *);
field_def fields_cpu[] = {
{ "CPU", 4, 8, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0 },
{ "User", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
{ "Nice", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
{ "System", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
{ "Spin", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
{ "Interrupt", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
{ "Idle", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
};
#define FLD_CPU_CPU FIELD_ADDR(fields_cpu, 0)
#define FLD_CPU_USR FIELD_ADDR(fields_cpu, 1)
#define FLD_CPU_NIC FIELD_ADDR(fields_cpu, 2)
#define FLD_CPU_SYS FIELD_ADDR(fields_cpu, 3)
#define FLD_CPU_SPIN FIELD_ADDR(fields_cpu, 4)
#define FLD_CPU_INT FIELD_ADDR(fields_cpu, 5)
#define FLD_CPU_IDLE FIELD_ADDR(fields_cpu, 6)
/* Define views */
field_def *view_cpu_0[] = {
FLD_CPU_CPU, FLD_CPU_USR, FLD_CPU_NIC, FLD_CPU_SYS, FLD_CPU_SPIN,
FLD_CPU_INT, FLD_CPU_IDLE, NULL
};
/* Define view managers */
struct view_manager cpu_mgr = {
"cpu", select_cpu, read_cpu, NULL, print_header,
print_cpu, keyboard_callback, NULL, NULL
};
field_view views_cpu[] = {
{ view_cpu_0, "cpu", 'C', &cpu_mgr },
{ NULL, NULL, 0, NULL }
};
int cpu_count;
int64_t *cpu_states;
struct cpustats *cpu_diff, *cpu_old, *cpu_tm;
/*
* percentages(cnt, out, new, old, diffs) - calculate percentage change
* between array "old" and "new", putting the percentages in "out".
* "cnt" is size of each array and "diffs" is used for scratch space.
* The array "old" is updated on each call.
* The routine assumes modulo arithmetic. This function is especially
* useful on BSD machines for calculating cpu state percentages.
*/
static int
percentages(int cnt, int64_t *out, int64_t *new, int64_t *old, int64_t *diffs)
{
int64_t change, total_change, *dp, half_total;
int i;
/* initialization */
total_change = 0;
dp = diffs;
/* calculate changes for each state and the overall change */
for (i = 0; i < cnt; i++) {
if ((change = *new - *old) < 0) {
/* this only happens when the counter wraps */
change = INT64_MAX - *old + *new;
}
total_change += (*dp++ = change);
*old++ = *new++;
}
/* avoid divide by zero potential */
if (total_change == 0)
total_change = 1;
/* calculate percentages based on overall change, rounding up */
half_total = total_change / 2l;
for (i = 0; i < cnt; i++)
*out++ = ((*diffs++ * 1000 + half_total) / total_change);
/* return the total in case the caller wants to use it */
return (total_change);
}
static void
cpu_info(void)
{
int cpustats_mib[] = { CTL_KERN, KERN_CPUSTATS, 0 }, i;
int64_t *tmpstate;
size_t size;
size = sizeof(*cpu_tm);
for (i = 0; i < cpu_count; i++) {
cpustats_mib[2] = i;
tmpstate = cpu_states + (CPUSTATES * i);
if (sysctl(cpustats_mib, 3, &cpu_tm[i], &size, NULL, 0) == -1)
error("sysctl KERN_CPUSTATS");
percentages(CPUSTATES, tmpstate, cpu_tm[i].cs_time,
cpu_old[i].cs_time, cpu_diff[i].cs_time);
}
}
static void
print_fld_percentage(field_def *fld, double val)
{
if (fld == NULL)
return;
tb_start();
tbprintf(val >= 1000 ? "%4.0f%%" : "%4.1f%%", val / 10.);
print_fld_tb(fld);
tb_end();
}
int
select_cpu(void)
{
return (0);
}
int
read_cpu(void)
{
cpu_info();
num_disp = cpu_count;
return (0);
}
int
initcpu(void)
{
field_view *v;
size_t size = sizeof(cpu_count);
int mib[2], i;
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
if (sysctl(mib, 2, &cpu_count, &size, NULL, 0) == -1)
return (-1);
if ((cpu_states = calloc(cpu_count,
CPUSTATES * sizeof(int64_t))) == NULL)
return (-1);
if ((cpu_tm = calloc(cpu_count, sizeof(*cpu_tm))) == NULL ||
(cpu_old = calloc(cpu_count, sizeof(*cpu_old))) == NULL ||
(cpu_diff = calloc(cpu_count, sizeof(*cpu_diff))) == NULL)
return (-1);
for (v = views_cpu; v->name != NULL; v++)
add_view(v);
read_cpu();
return(1);
}
#define ADD_EMPTY_LINE \
do { \
if (cur >= dispstart && cur < end) \
end_line(); \
if (++cur >= end) \
return; \
} while (0)
#define ADD_LINE_CPU(v, _cs) do { \
if (cur >= dispstart && cur < end) { \
print_fld_size(FLD_CPU_CPU, (v)); \
if (cpu_tm[v].cs_flags & CPUSTATS_ONLINE) { \
print_fld_percentage(FLD_CPU_USR, _cs[CP_USER]);\
print_fld_percentage(FLD_CPU_NIC, _cs[CP_NICE]);\
print_fld_percentage(FLD_CPU_SYS, _cs[CP_SYS]); \
print_fld_percentage(FLD_CPU_SPIN, _cs[CP_SPIN]);\
print_fld_percentage(FLD_CPU_INT, _cs[CP_INTR]);\
print_fld_percentage(FLD_CPU_IDLE, _cs[CP_IDLE]);\
} else { \
print_fld_str(FLD_CPU_USR, "-"); \
print_fld_str(FLD_CPU_NIC, "-"); \
print_fld_str(FLD_CPU_SYS, "-"); \
print_fld_str(FLD_CPU_SPIN, "-"); \
print_fld_str(FLD_CPU_INT, "-"); \
print_fld_str(FLD_CPU_IDLE, "-"); \
} \
end_line(); \
} \
if (++cur >= end) \
return; \
} while (0)
void
print_cpu(void)
{
int cur = 0, c, i;
int end = dispstart + maxprint;
int64_t *states;
double value[CPUSTATES];
if (end > num_disp)
end = num_disp;
for (c = 0; c < cpu_count; c++) {
states = cpu_states + (CPUSTATES * c);
for (i = 0; i < CPUSTATES; i++)
value[i] = *states++;
ADD_LINE_CPU(c, value);
}
ADD_EMPTY_LINE;
}
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