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https://gitlab.com/procps-ng/procps.git
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8fcfb01a81
The copyrights of the source files were all out of date and were not the same format. This has been corrected. The source of the authors was examining the git log for each file. Signed-off-by: Craig Small <csmall@dropbear.xyz>
168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
/*
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* File for parsing top-level /proc entities.
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*
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* Copyright © 2011-2023 Jim Warner <james.warner@comcast.net>
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* Copyright © 2011-2023 Craig Small <csmall@dropbear.xyz>
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* Copyright © 1998-2008 Albert Cahalan
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* Copyright © 1992-1998 Michael K. Johnson <johnsonm@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <locale.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#ifdef __CYGWIN__
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#include <sys/param.h>
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#endif
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#include "misc.h"
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#include "procps-private.h"
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#define LOADAVG_FILE "/proc/loadavg"
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/* evals 'x' twice */
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#define SET_IF_DESIRED(x,y) do{ if(x) *(x) = (y); }while(0)
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/* return minimum of two values */
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#ifndef __CYGWIN__
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#define MIN(x,y) ((x) < (y) ? (x) : (y))
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#endif
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/*
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* procps_hertz_get:
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*
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*
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* Some values in /proc are expressed in units of 1/HZ seconds, where HZ
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* is the kernel clock tick rate. One of these units is called a jiffy.
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* The HZ value used in the kernel may vary according to hacker desire.
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*
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* On some architectures, the kernel provides an ELF note to indicate
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* HZ.
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*
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* Returns:
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* The discovered or assumed hertz value
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*/
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PROCPS_EXPORT long procps_hertz_get(void)
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{
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long hz;
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#ifdef _SC_CLK_TCK
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if ((hz = sysconf(_SC_CLK_TCK)) > 0)
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return hz;
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#endif
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#ifdef HZ
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return(HZ);
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#endif
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/* Last resort, assume 100 */
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return 100;
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}
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/*
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* procps_loadavg:
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* @av1: location to store 1 minute load average
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* @av5: location to store 5 minute load average
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* @av15: location to store 15 minute load average
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*
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* Find the 1,5 and 15 minute load average of the system
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*
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* Returns: 0 on success <0 on error
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*/
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PROCPS_EXPORT int procps_loadavg(
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double *restrict av1,
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double *restrict av5,
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double *restrict av15)
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{
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double avg_1=0, avg_5=0, avg_15=0;
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locale_t tmplocale;
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int retval=0;
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FILE *fp;
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if ((fp = fopen(LOADAVG_FILE, "r")) == NULL)
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return -errno;
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tmplocale = newlocale(LC_NUMERIC_MASK, "C", (locale_t)0);
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uselocale(tmplocale);
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if (fscanf(fp, "%lf %lf %lf", &avg_1, &avg_5, &avg_15) < 3)
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retval = -ERANGE;
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fclose(fp);
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uselocale(LC_GLOBAL_LOCALE);
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freelocale(tmplocale);
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SET_IF_DESIRED(av1, avg_1);
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SET_IF_DESIRED(av5, avg_5);
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SET_IF_DESIRED(av15, avg_15);
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return retval;
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}
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/////////////////////////////////////////////////////////////////////////////
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#define PROCFS_PID_MAX "/proc/sys/kernel/pid_max"
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#define DEFAULT_PID_LENGTH 5
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/*
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* procps_pid_length
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*
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* Return the length of the maximum possible pid.
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*
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* Returns either the strlen of PROCFS_PID_MAX or the
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* best-guess DEFAULT_PID_LENGTH
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*/
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PROCPS_EXPORT unsigned int procps_pid_length(void)
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{
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FILE *fp;
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char pidbuf[24];
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static __thread int pid_length=0;
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if (pid_length)
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return pid_length;
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pid_length = DEFAULT_PID_LENGTH;
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if ((fp = fopen(PROCFS_PID_MAX, "r")) != NULL) {
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if (fgets(pidbuf, sizeof(pidbuf), fp) != NULL) {
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pid_length = strlen(pidbuf);
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if (pidbuf[pid_length-1] == '\n')
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--pid_length;
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}
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fclose(fp);
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}
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return pid_length;
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}
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///////////////////////////////////////////////////////////////////////////
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/* procps_cpu_count:
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*
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* Returns the number of CPUs that are currently online.
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*
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*/
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long procps_cpu_count(void)
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{
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long cpus;
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cpus = sysconf(_SC_NPROCESSORS_ONLN);
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if (cpus < 1)
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return 1;
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return cpus;
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}
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