8fcd14de18
A library should generally return an error value, rather than printing to stderr a message. procps_loadavg() had a few things to change: It had a global buffer, but we don't call this function over and over except in tload. It also did had two macros where a plain fopen() would do the job nicely. This removed the macro FILE_TO_BUF which was used everywhere in oldlib but only for loadavg in newlib. This library change will set us up to fix tload.
165 lines
4.0 KiB
C
165 lines
4.0 KiB
C
/*
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* File for parsing top-level /proc entities.
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* Copyright (C) 1992-1998 by Michael K. Johnson, johnsonm@redhat.com
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* Copyright 1998-2003 Albert Cahalan
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* June 2003, Fabian Frederick, slab info
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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;
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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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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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