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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2026 Project Tick. All rights reserved.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <stdio.h>
#include <unistd.h>
#include <string.h>
#include "ps.h"
fixpt_t ccpu = 0;
int nlistread = 0;
unsigned long mem_total_kb = 0;
int fscale = 100;
/*
* On Linux, we read memory stats from /proc/meminfo.
* ccpu and fscale are used for CPU calculations; we'll use a simplified model.
*/
int
donlist(void)
{
FILE *fp;
char line[256];
if (nlistread)
return (0);
fp = fopen("/proc/meminfo", "r");
if (fp) {
while (fgets(line, sizeof(line), fp)) {
if (sscanf(line, "MemTotal: %lu", &mem_total_kb) == 1) {
break;
}
}
fclose(fp);
}
if (mem_total_kb == 0)
mem_total_kb = 1024 * 256; /* fallback */
/*
* Linux fixed-point scale for load averages is usually 1 << 8,
* but for ps pct calculation we just need a baseline.
*/
fscale = 100;
nlistread = 1;
return (0);
}
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