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Diffstat (limited to 'library/sysinfo.c')
| -rw-r--r-- | library/sysinfo.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/library/sysinfo.c b/library/sysinfo.c new file mode 100644 index 0000000..35a9922 --- /dev/null +++ b/library/sysinfo.c @@ -0,0 +1,167 @@ +/* + * File for parsing top-level /proc entities. + * + * Copyright © 2011-2023 Jim Warner <james.warner@comcast.net> + * Copyright © 2011-2023 Craig Small <csmall@dropbear.xyz> + * Copyright © 1998-2008 Albert Cahalan + * Copyright © 1992-1998 Michael K. Johnson <johnsonm@redhat.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <locale.h> +#include <errno.h> + +#include <unistd.h> +#include <fcntl.h> +#ifdef __CYGWIN__ +#include <sys/param.h> +#endif +#include "misc.h" +#include "procps-private.h" + + +#define LOADAVG_FILE "/proc/loadavg" + +/* evals 'x' twice */ +#define SET_IF_DESIRED(x,y) do{ if(x) *(x) = (y); }while(0) + +/* return minimum of two values */ +#ifndef __CYGWIN__ +#define MIN(x,y) ((x) < (y) ? (x) : (y)) +#endif + +/* + * procps_hertz_get: + * + * + * Some values in /proc are expressed in units of 1/HZ seconds, where HZ + * is the kernel clock tick rate. One of these units is called a jiffy. + * The HZ value used in the kernel may vary according to hacker desire. + * + * On some architectures, the kernel provides an ELF note to indicate + * HZ. + * + * Returns: + * The discovered or assumed hertz value + */ +PROCPS_EXPORT long procps_hertz_get(void) +{ + long hz; + +#ifdef _SC_CLK_TCK + if ((hz = sysconf(_SC_CLK_TCK)) > 0) + return hz; +#endif +#ifdef HZ + return(HZ); +#endif + /* Last resort, assume 100 */ + return 100; +} + +/* + * procps_loadavg: + * @av1: location to store 1 minute load average + * @av5: location to store 5 minute load average + * @av15: location to store 15 minute load average + * + * Find the 1,5 and 15 minute load average of the system + * + * Returns: 0 on success <0 on error + */ +PROCPS_EXPORT int procps_loadavg( + double *restrict av1, + double *restrict av5, + double *restrict av15) +{ + double avg_1=0, avg_5=0, avg_15=0; + locale_t tmplocale; + int retval=0; + FILE *fp; + + if ((fp = fopen(LOADAVG_FILE, "r")) == NULL) + return -errno; + + tmplocale = newlocale(LC_NUMERIC_MASK, "C", (locale_t)0); + uselocale(tmplocale); + if (fscanf(fp, "%lf %lf %lf", &avg_1, &avg_5, &avg_15) < 3) + retval = -ERANGE; + + fclose(fp); + uselocale(LC_GLOBAL_LOCALE); + freelocale(tmplocale); + SET_IF_DESIRED(av1, avg_1); + SET_IF_DESIRED(av5, avg_5); + SET_IF_DESIRED(av15, avg_15); + return retval; +} + +///////////////////////////////////////////////////////////////////////////// + +#define PROCFS_PID_MAX "/proc/sys/kernel/pid_max" +#define DEFAULT_PID_LENGTH 5 + +/* + * procps_pid_length + * + * Return the length of the maximum possible pid. + * + * Returns either the strlen of PROCFS_PID_MAX or the + * best-guess DEFAULT_PID_LENGTH + */ +PROCPS_EXPORT unsigned int procps_pid_length(void) +{ + FILE *fp; + char pidbuf[24]; + static __thread int pid_length=0; + + if (pid_length) + return pid_length; + + pid_length = DEFAULT_PID_LENGTH; + if ((fp = fopen(PROCFS_PID_MAX, "r")) != NULL) { + if (fgets(pidbuf, sizeof(pidbuf), fp) != NULL) { + pid_length = strlen(pidbuf); + if (pidbuf[pid_length-1] == '\n') + --pid_length; + } + fclose(fp); + } + return pid_length; +} + +/////////////////////////////////////////////////////////////////////////// + +/* procps_cpu_count: + * + * Returns the number of CPUs that are currently online. + * + */ +long procps_cpu_count(void) +{ + long cpus; + + cpus = sysconf(_SC_NPROCESSORS_ONLN); + if (cpus < 1) + return 1; + return cpus; +} + |