X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgetloadavg.c;h=6e228191ee8b716a326f4e2db19ed2a77f5d52cf;hb=23eecb48e39afd0d267d64d40ba6bf97aa865e13;hp=dae189ffe58df426454202ed832fbedd12b3522e;hpb=330d1dc984266784153b0d9b59334344fb999f0a;p=gnulib.git diff --git a/lib/getloadavg.c b/lib/getloadavg.c index dae189ffe..6e228191e 100644 --- a/lib/getloadavg.c +++ b/lib/getloadavg.c @@ -1,11 +1,15 @@ /* Get the system load averages. - Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995 - Free Software Foundation, Inc. - This program is free software; you can redistribute it and/or modify + Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2013 Free Software + Foundation, Inc. + + NOTE: The canonical source of this file is maintained with gnulib. + Bugs can be reported to bug-gnulib@gnu.org. + + This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of @@ -13,49 +17,62 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, - USA. */ + along with this program. If not, see . */ /* Compile-time symbols that this file uses: - FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. - KERNEL_FILE Pathname of the kernel to nlist. - LDAV_CVT() Scale the load average from the kernel. - Returns a double. - LDAV_SYMBOL Name of kernel symbol giving load average. - LOAD_AVE_TYPE Type of the load average array in the kernel. - Must be defined unless one of - apollo, DGUX, NeXT, or UMAX is defined; - otherwise, no load average is available. - NLIST_STRUCT Include nlist.h, not a.out.h, and - the nlist n_name element is a pointer, - not an array. - NLIST_NAME_UNION struct nlist has an n_un member, not n_name. - LINUX_LDAV_FILE [__linux__]: File containing load averages. + HAVE_PSTAT_GETDYNAMIC Define this if your system has the + pstat_getdynamic function. I think it + is unique to HPUX9. The best way to get the + definition is through the AC_FUNC_GETLOADAVG + macro that comes with autoconf 2.13 or newer. + If that isn't an option, then just put + AC_CHECK_FUNCS(pstat_getdynamic) in your + configure.ac file. + HAVE_LIBPERFSTAT Define this if your system has the + perfstat_cpu_total function in libperfstat (AIX). + FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. + KERNEL_FILE Name of the kernel file to nlist. + LDAV_CVT() Scale the load average from the kernel. + Returns a double. + LDAV_SYMBOL Name of kernel symbol giving load average. + LOAD_AVE_TYPE Type of the load average array in the kernel. + Must be defined unless one of + apollo, DGUX, NeXT, or UMAX is defined; + or we have libkstat; + otherwise, no load average is available. + HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults + to this. + NLIST_STRUCT Include nlist.h, not a.out.h. + N_NAME_POINTER The nlist n_name element is a pointer, + not an array. + HAVE_STRUCT_NLIST_N_UN_N_NAME 'n_un.n_name' is member of 'struct nlist'. + LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing + load averages. Specific system predefines this file uses, aside from setting default values if not emacs: apollo - BSD Real BSD, not just BSD-like. + BSD Real BSD, not just BSD-like. convex DGUX - eunice UNIX emulator under VMS. + eunice UNIX emulator under VMS. hpux - MSDOS No-op for MSDOS. + __MSDOS__ No-op for MSDOS. NeXT sgi - sequent Sequent Dynix 3.x.x (BSD) - _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) + sequent Sequent Dynix 3.x.x (BSD) + _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) sony_news NEWS-OS (works at least for 4.1C) UMAX UMAX4_3 VMS - WIN32 No-op for Windows95/NT. - __linux__ Linux: assumes /proc filesystem mounted. - Support from Michael K. Johnson. - __NetBSD__ NetBSD: assumes /kern filesystem mounted. + WINDOWS32 No-op for Windows95/NT. + __linux__ Linux: assumes /proc file system mounted. + Support from Michael K. Johnson. + __CYGWIN__ Cygwin emulates linux /proc/loadavg. + __NetBSD__ NetBSD: assumes /kern file system mounted. In addition, to avoid nesting many #ifdefs, we internally set LDAV_DONE to indicate that the load average has been computed. @@ -63,65 +80,44 @@ We also #define LDAV_PRIVILEGED if a program will require special installation to be able to call getloadavg. */ -/* This should always be first. */ -#ifdef HAVE_CONFIG_H #include -#endif - -#include - -/* Both the Emacs and non-Emacs sections want this. Some - configuration files' definitions for the LOAD_AVE_CVT macro (like - sparc.h's) use macros like FSCALE, defined here. */ -#ifdef unix -#include -#endif - - -/* Exclude all the code except the test program at the end - if the system has its own `getloadavg' function. - The declaration of `errno' is needed by the test program - as well as the function itself, so it comes first. */ +/* Specification. */ +#include #include +#include +#include -#ifndef errno -extern int errno; -#endif - -#ifndef HAVE_GETLOADAVG - - -/* The existing Emacs configuration files define a macro called - LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and - returns the load average multiplied by 100. What we actually want - is a macro called LDAV_CVT, which returns the load average as an - unmultiplied double. +# include - For backwards compatibility, we'll define LDAV_CVT in terms of - LOAD_AVE_CVT, but future machine config files should just define - LDAV_CVT directly. */ +# if HAVE_SYS_PARAM_H +# include +# endif -#if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT) -#define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) -#endif +# include "intprops.h" -#if !defined (BSD) && defined (ultrix) +# if !defined (BSD) && defined (ultrix) /* Ultrix behaves like BSD on Vaxen. */ -#define BSD -#endif +# define BSD +# endif -#ifdef NeXT +# ifdef NeXT /* NeXT in the 2.{0,1,2} releases defines BSD in , which conflicts with the definition understood in this file, that this really is BSD. */ -#undef BSD +# undef BSD /* NeXT defines FSCALE in . However, we take FSCALE being defined to mean that the nlist method should be used, which is not true. */ -#undef FSCALE -#endif +# undef FSCALE +# endif + +/* Same issues as for NeXT apply to the HURD-based GNU system. */ +# ifdef __GNU__ +# undef BSD +# undef FSCALE +# endif /* __GNU__ */ /* Set values that are different from the defaults, which are set a little farther down with #ifndef. */ @@ -129,416 +125,383 @@ extern int errno; /* Some shorthands. */ -#if defined (HPUX) && !defined (hpux) -#define hpux -#endif - -#if defined (__hpux) && !defined (hpux) -#define hpux -#endif - -#if defined (__sun) && !defined (sun) -#define sun -#endif - -#if defined(hp300) && !defined(hpux) -#define MORE_BSD -#endif - -#if defined(ultrix) && defined(mips) -#define decstation -#endif - -#if (defined(sun) && defined(SVR4)) || defined (SOLARIS2) -#define SUNOS_5 -#endif - -#if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) -#define OSF_ALPHA -#include -#endif - -#if defined (__osf__) && (defined (mips) || defined (__mips__)) -#define OSF_MIPS -#include -#endif +# if defined (HPUX) && !defined (hpux) +# define hpux +# endif + +# if defined (__hpux) && !defined (hpux) +# define hpux +# endif + +# if defined (__sun) && !defined (sun) +# define sun +# endif + +# if defined (hp300) && !defined (hpux) +# define MORE_BSD +# endif + +# if defined (ultrix) && defined (mips) +# define decstation +# endif + +# if defined (__SVR4) && !defined (SVR4) +# define SVR4 +# endif + +# if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) +# define SUNOS_5 +# endif + +# if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) +# define OSF_ALPHA +# include +# include +# include +# include +/* Tru64 4.0D's table.h redefines sys */ +# undef sys +# endif + +# if defined (__osf__) && (defined (mips) || defined (__mips__)) +# define OSF_MIPS +# include +# endif /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by default, but _MACH_IND_SYS_TYPES is defined in . Combine that with a couple of other things and we'll have a unique match. */ -#if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) -#define tek4300 /* Define by emacs, but not by other users. */ -#endif +# if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) +# define tek4300 /* Define by emacs, but not by other users. */ +# endif /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ -#ifndef LOAD_AVE_TYPE +# ifndef LOAD_AVE_TYPE -#ifdef MORE_BSD -#define LOAD_AVE_TYPE long -#endif +# ifdef MORE_BSD +# define LOAD_AVE_TYPE long +# endif -#ifdef sun -#define LOAD_AVE_TYPE long -#endif +# ifdef sun +# define LOAD_AVE_TYPE long +# endif -#ifdef decstation -#define LOAD_AVE_TYPE long -#endif +# ifdef decstation +# define LOAD_AVE_TYPE long +# endif -#ifdef _SEQUENT_ -#define LOAD_AVE_TYPE long -#endif +# ifdef _SEQUENT_ +# define LOAD_AVE_TYPE long +# endif -#ifdef sgi -#define LOAD_AVE_TYPE long -#endif +# ifdef sgi +# define LOAD_AVE_TYPE long +# endif -#ifdef SVR4 -#define LOAD_AVE_TYPE long -#endif +# ifdef SVR4 +# define LOAD_AVE_TYPE long +# endif -#ifdef sony_news -#define LOAD_AVE_TYPE long -#endif +# ifdef sony_news +# define LOAD_AVE_TYPE long +# endif -#ifdef sequent -#define LOAD_AVE_TYPE long -#endif +# ifdef sequent +# define LOAD_AVE_TYPE long +# endif -#ifdef OSF_ALPHA -#define LOAD_AVE_TYPE long -#endif +# ifdef OSF_ALPHA +# define LOAD_AVE_TYPE long +# endif -#if defined (ardent) && defined (titan) -#define LOAD_AVE_TYPE long -#endif +# if defined (ardent) && defined (titan) +# define LOAD_AVE_TYPE long +# endif -#ifdef tek4300 -#define LOAD_AVE_TYPE long -#endif +# ifdef tek4300 +# define LOAD_AVE_TYPE long +# endif -#if defined(alliant) && defined(i860) /* Alliant FX/2800 */ -#define LOAD_AVE_TYPE long -#endif +# if defined (alliant) && defined (i860) /* Alliant FX/2800 */ +# define LOAD_AVE_TYPE long +# endif -#ifdef _AIX -#define LOAD_AVE_TYPE long -#endif +# if defined _AIX && ! defined HAVE_LIBPERFSTAT +# define LOAD_AVE_TYPE long +# endif -#ifdef convex -#define LOAD_AVE_TYPE double -#ifndef LDAV_CVT -#define LDAV_CVT(n) (n) -#endif -#endif +# ifdef convex +# define LOAD_AVE_TYPE double +# ifndef LDAV_CVT +# define LDAV_CVT(n) (n) +# endif +# endif -#endif /* No LOAD_AVE_TYPE. */ +# endif /* No LOAD_AVE_TYPE. */ -#ifdef OSF_ALPHA +# ifdef OSF_ALPHA /* defines an incorrect value for FSCALE on Alpha OSF/1, according to ghazi@noc.rutgers.edu. */ -#undef FSCALE -#define FSCALE 1024.0 -#endif +# undef FSCALE +# define FSCALE 1024.0 +# endif -#if defined(alliant) && defined(i860) /* Alliant FX/2800 */ +# if defined (alliant) && defined (i860) /* Alliant FX/2800 */ /* defines an incorrect value for FSCALE on an Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */ -#undef FSCALE -#define FSCALE 100.0 -#endif +# undef FSCALE +# define FSCALE 100.0 +# endif -#ifndef FSCALE +# ifndef FSCALE /* SunOS and some others define FSCALE in sys/param.h. */ -#ifdef MORE_BSD -#define FSCALE 2048.0 -#endif +# ifdef MORE_BSD +# define FSCALE 2048.0 +# endif -#if defined(MIPS) || defined(SVR4) || defined(decstation) -#define FSCALE 256 -#endif +# if defined (MIPS) || defined (SVR4) || defined (decstation) +# define FSCALE 256 +# endif -#if defined (sgi) || defined (sequent) +# if defined (sgi) || defined (sequent) /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined above under #ifdef MIPS. But we want the sgi value. */ -#undef FSCALE -#define FSCALE 1000.0 -#endif - -#if defined (ardent) && defined (titan) -#define FSCALE 65536.0 -#endif - -#ifdef tek4300 -#define FSCALE 100.0 -#endif - -#ifdef _AIX -#define FSCALE 65536.0 -#endif +# undef FSCALE +# define FSCALE 1000.0 +# endif -#endif /* Not FSCALE. */ +# if defined (ardent) && defined (titan) +# define FSCALE 65536.0 +# endif -#if !defined (LDAV_CVT) && defined (FSCALE) -#define LDAV_CVT(n) (((double) (n)) / FSCALE) -#endif +# ifdef tek4300 +# define FSCALE 100.0 +# endif -/* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */ -#ifndef NLIST_STRUCT +# if defined _AIX && !defined HAVE_LIBPERFSTAT +# define FSCALE 65536.0 +# endif -#ifdef MORE_BSD -#define NLIST_STRUCT -#endif +# endif /* Not FSCALE. */ -#ifdef sun -#define NLIST_STRUCT -#endif +# if !defined (LDAV_CVT) && defined (FSCALE) +# define LDAV_CVT(n) (((double) (n)) / FSCALE) +# endif -#ifdef decstation -#define NLIST_STRUCT -#endif +# ifndef NLIST_STRUCT +# if HAVE_NLIST_H +# define NLIST_STRUCT +# endif +# endif -#ifdef hpux -#define NLIST_STRUCT -#endif +# if defined (sgi) || (defined (mips) && !defined (BSD)) +# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) +# endif -#if defined (_SEQUENT_) || defined (sequent) -#define NLIST_STRUCT -#endif -#ifdef sgi -#define NLIST_STRUCT -#endif +# if !defined (KERNEL_FILE) && defined (sequent) +# define KERNEL_FILE "/dynix" +# endif -#ifdef SVR4 -#define NLIST_STRUCT -#endif +# if !defined (KERNEL_FILE) && defined (hpux) +# define KERNEL_FILE "/hp-ux" +# endif -#ifdef sony_news -#define NLIST_STRUCT -#endif +# if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan))) +# define KERNEL_FILE "/unix" +# endif -#ifdef OSF_ALPHA -#define NLIST_STRUCT -#endif -#if defined (ardent) && defined (titan) -#define NLIST_STRUCT -#endif +# if !defined (LDAV_SYMBOL) && defined (alliant) +# define LDAV_SYMBOL "_Loadavg" +# endif -#ifdef tek4300 -#define NLIST_STRUCT -#endif +# if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || (defined (_AIX) && !defined(HAVE_LIBPERFSTAT))) +# define LDAV_SYMBOL "avenrun" +# endif -#ifdef butterfly -#define NLIST_STRUCT -#endif - -#if defined(alliant) && defined(i860) /* Alliant FX/2800 */ -#define NLIST_STRUCT -#endif - -#ifdef _AIX -#define NLIST_STRUCT -#endif - -#endif /* defined (NLIST_STRUCT) */ - - -#if defined(sgi) || (defined(mips) && !defined(BSD)) -#define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) -#endif - - -#if !defined (KERNEL_FILE) && defined (sequent) -#define KERNEL_FILE "/dynix" -#endif - -#if !defined (KERNEL_FILE) && defined (hpux) -#define KERNEL_FILE "/hp-ux" -#endif - -#if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan))) -#define KERNEL_FILE "/unix" -#endif - - -#if !defined (LDAV_SYMBOL) && defined (alliant) -#define LDAV_SYMBOL "_Loadavg" -#endif - -#if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX)) -#define LDAV_SYMBOL "avenrun" -#endif - -#ifdef HAVE_UNISTD_H -#include -#endif - -#include +# include /* LOAD_AVE_TYPE should only get defined if we're going to use the nlist method. */ -#if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) -#define LOAD_AVE_TYPE double -#endif - -#ifdef LOAD_AVE_TYPE - -#ifndef VMS -#ifndef __linux__ -#ifndef NLIST_STRUCT -#include -#else /* NLIST_STRUCT */ -#include -#endif /* NLIST_STRUCT */ - -#ifdef SUNOS_5 -#include -#include -#include -#endif - -#ifndef KERNEL_FILE -#define KERNEL_FILE "/vmunix" -#endif /* KERNEL_FILE */ - -#ifndef LDAV_SYMBOL -#define LDAV_SYMBOL "_avenrun" -#endif /* LDAV_SYMBOL */ -#endif /* __linux__ */ - -#else /* VMS */ - -#ifndef eunice -#include -#include -#else /* eunice */ -#include -#endif /* eunice */ -#endif /* VMS */ - -#ifndef LDAV_CVT -#define LDAV_CVT(n) ((double) (n)) -#endif /* !LDAV_CVT */ - -#endif /* LOAD_AVE_TYPE */ - -#ifdef NeXT -#ifdef HAVE_MACH_MACH_H -#include -#else -#include -#endif -#endif /* NeXT */ - -#ifdef sgi -#include -#endif /* sgi */ - -#ifdef UMAX -#include -#include -#include -#include -#include - -#ifdef UMAX_43 -#include -#include -#include -#include -#include -#else /* Not UMAX_43. */ -#include -#include -#include -#include -#include -#include -#endif /* Not UMAX_43. */ -#endif /* UMAX */ - -#ifdef DGUX -#include -#endif - -#if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION) -#include -#else -#include -#endif +# if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL)) +# define LOAD_AVE_TYPE double +# endif + +# ifdef LOAD_AVE_TYPE + +# ifndef __VMS +# ifndef __linux__ +# ifndef NLIST_STRUCT +# include +# else /* NLIST_STRUCT */ +# include +# endif /* NLIST_STRUCT */ + +# ifdef SUNOS_5 +# include +# include +# endif + +# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) +# include +# endif + +# ifndef KERNEL_FILE +# define KERNEL_FILE "/vmunix" +# endif /* KERNEL_FILE */ + +# ifndef LDAV_SYMBOL +# define LDAV_SYMBOL "_avenrun" +# endif /* LDAV_SYMBOL */ +# endif /* __linux__ */ + +# else /* __VMS */ + +# ifndef eunice +# include +# include +# else /* eunice */ +# include +# endif /* eunice */ +# endif /* __VMS */ + +# ifndef LDAV_CVT +# define LDAV_CVT(n) ((double) (n)) +# endif /* !LDAV_CVT */ + +# endif /* LOAD_AVE_TYPE */ + +# if defined HAVE_LIBPERFSTAT +# include +# include +# include +# ifndef SBITS +# define SBITS 16 +# endif +# endif + +# if defined (__GNU__) && !defined (NeXT) +/* Note that NeXT Openstep defines __GNU__ even though it should not. */ +/* GNU system acts much like NeXT, for load average purposes, + but not exactly. */ +# define NeXT +# define host_self mach_host_self +# endif + +# ifdef NeXT +# ifdef HAVE_MACH_MACH_H +# include +# else +# include +# endif +# endif /* NeXT */ + +# ifdef sgi +# include +# endif /* sgi */ + +# ifdef UMAX +# include +# include +# include +# include + +# ifdef UMAX_43 +# include +# include +# include +# include +# include +# else /* Not UMAX_43. */ +# include +# include +# include +# include +# include +# include +# endif /* Not UMAX_43. */ +# endif /* UMAX */ + +# ifdef DGUX +# include +# endif + +# if (defined __linux__ || defined __CYGWIN__ || defined SUNOS_5 \ + || (defined LOAD_AVE_TYPE && ! defined __VMS)) +# include +# endif /* Avoid static vars inside a function since in HPUX they dump as pure. */ -#ifdef NeXT +# ifdef NeXT static processor_set_t default_set; -static int getloadavg_initialized; -#endif /* NeXT */ +static bool getloadavg_initialized; +# endif /* NeXT */ -#ifdef UMAX +# ifdef UMAX static unsigned int cpus = 0; static unsigned int samples; -#endif /* UMAX */ +# endif /* UMAX */ -#ifdef DGUX -static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ -#endif /* DGUX */ +# ifdef DGUX +static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ +# endif /* DGUX */ -#ifdef LOAD_AVE_TYPE +# if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE) /* File descriptor open to /dev/kmem or VMS load ave driver. */ static int channel; -/* Nonzero iff channel is valid. */ -static int getloadavg_initialized; +/* True if channel is valid. */ +static bool getloadavg_initialized; /* Offset in kmem to seek to read load average, or 0 means invalid. */ static long offset; -#if !defined(VMS) && !defined(sgi) && !defined(__linux__) -static struct nlist nl[2]; -#endif /* Not VMS or sgi */ +# if ! defined __VMS && ! defined sgi && ! defined __linux__ +static struct nlist name_list[2]; +# endif -#ifdef SUNOS_5 +# ifdef SUNOS_5 static kvm_t *kd; -#endif /* SUNOS_5 */ +# endif /* SUNOS_5 */ -#endif /* LOAD_AVE_TYPE */ +# endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ /* Put the 1 minute, 5 minute and 15 minute load averages into the first NELEM elements of LOADAVG. Return the number written (never more than 3, but may be less than NELEM), - or -1 if an error occurred. */ + or -1 (setting errno) if an error occurred. */ int -getloadavg (loadavg, nelem) - double loadavg[]; - int nelem; +getloadavg (double loadavg[], int nelem) { - int elem = 0; /* Return value. */ + int elem = 0; /* Return value. */ -#ifdef NO_GET_LOAD_AVG -#define LDAV_DONE - /* Set errno to zero to indicate that there was no particular error; - this function just can't work at all on this system. */ - errno = 0; +# ifdef NO_GET_LOAD_AVG +# define LDAV_DONE + errno = ENOSYS; elem = -1; -#endif +# endif -#if !defined (LDAV_DONE) && defined (SUNOS_5) +# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) /* Solaris <= 2.6 */ /* Use libkstat because we don't have to be root. */ -#define LDAV_DONE +# define LDAV_DONE kstat_ctl_t *kc; kstat_t *ksp; kstat_named_t *kn; + int saved_errno; kc = kstat_open (); - if (kc == 0) return -1; + if (kc == 0) + return -1; ksp = kstat_lookup (kc, "unix", 0, "system_misc"); - if (ksp == 0 ) return -1; - if (kstat_read (kc, ksp, 0) == -1) return -1; + if (ksp == 0) + return -1; + if (kstat_read (kc, ksp, 0) == -1) + return -1; kn = kstat_data_lookup (ksp, "avenrun_1min"); @@ -550,66 +513,128 @@ getloadavg (loadavg, nelem) } if (nelem >= 1) - loadavg[elem++] = (double) kn->value.ul/FSCALE; + loadavg[elem++] = (double) kn->value.ul / FSCALE; if (nelem >= 2) { kn = kstat_data_lookup (ksp, "avenrun_5min"); if (kn != 0) - { - loadavg[elem++] = (double) kn->value.ul/FSCALE; - - if (nelem >= 3) - { - kn = kstat_data_lookup (ksp, "avenrun_15min"); - if (kn != 0) - loadavg[elem++] = (double) kn->value.ul/FSCALE; - } - } + { + loadavg[elem++] = (double) kn->value.ul / FSCALE; + + if (nelem >= 3) + { + kn = kstat_data_lookup (ksp, "avenrun_15min"); + if (kn != 0) + loadavg[elem++] = (double) kn->value.ul / FSCALE; + } + } } + saved_errno = errno; kstat_close (kc); -#endif /* SUNOS_5 */ + errno = saved_errno; +# endif /* HAVE_LIBKSTAT */ -#if !defined (LDAV_DONE) && defined (__linux__) -#define LDAV_DONE -#undef LOAD_AVE_TYPE +# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) + /* HP-UX */ +/* Use pstat_getdynamic() because we don't have to be root. */ +# define LDAV_DONE +# undef LOAD_AVE_TYPE -#ifndef LINUX_LDAV_FILE -#define LINUX_LDAV_FILE "/proc/loadavg" -#endif + struct pst_dynamic dyn_info; + if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0) + return -1; + if (nelem > 0) + loadavg[elem++] = dyn_info.psd_avg_1_min; + if (nelem > 1) + loadavg[elem++] = dyn_info.psd_avg_5_min; + if (nelem > 2) + loadavg[elem++] = dyn_info.psd_avg_15_min; + +# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ - char ldavgbuf[40]; - double load_ave[3]; - int fd, count; +# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT /* AIX */ +# define LDAV_DONE +# undef LOAD_AVE_TYPE +/* Use perfstat_cpu_total because we don't have to be root. */ + { + perfstat_cpu_total_t cpu_stats; + int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1); + if (result == -1) + return result; + loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS); + loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS); + loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS); + elem = 3; + } +# endif + +# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) + /* Linux without glibc, Cygwin */ +# define LDAV_DONE +# undef LOAD_AVE_TYPE + +# ifndef LINUX_LDAV_FILE +# define LINUX_LDAV_FILE "/proc/loadavg" +# endif + + char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")]; + char const *ptr = ldavgbuf; + int fd, count, saved_errno; fd = open (LINUX_LDAV_FILE, O_RDONLY); if (fd == -1) return -1; - count = read (fd, ldavgbuf, 40); + count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); + saved_errno = errno; (void) close (fd); + errno = saved_errno; if (count <= 0) return -1; + ldavgbuf[count] = '\0'; - count = sscanf (ldavgbuf, "%lf %lf %lf", - &load_ave[0], &load_ave[1], &load_ave[2]); - if (count < 1) - return -1; + for (elem = 0; elem < nelem; elem++) + { + double numerator = 0; + double denominator = 1; + + while (*ptr == ' ') + ptr++; - for (elem = 0; elem < nelem && elem < count; elem++) - loadavg[elem] = load_ave[elem]; + /* Finish if this number is missing, and report an error if all + were missing. */ + if (! ('0' <= *ptr && *ptr <= '9')) + { + if (elem == 0) + { + errno = ENOTSUP; + return -1; + } + break; + } + + while ('0' <= *ptr && *ptr <= '9') + numerator = 10 * numerator + (*ptr++ - '0'); + + if (*ptr == '.') + for (ptr++; '0' <= *ptr && *ptr <= '9'; ptr++) + numerator = 10 * numerator + (*ptr - '0'), denominator *= 10; + + loadavg[elem++] = numerator / denominator; + } return elem; -#endif /* __linux__ */ +# endif /* __linux__ || __CYGWIN__ */ -#if !defined (LDAV_DONE) && defined (__NetBSD__) -#define LDAV_DONE -#undef LOAD_AVE_TYPE +# if !defined (LDAV_DONE) && defined (__NetBSD__) /* NetBSD < 0.9 */ +# define LDAV_DONE +# undef LOAD_AVE_TYPE -#ifndef NETBSD_LDAV_FILE -#define NETBSD_LDAV_FILE "/kern/loadavg" -#endif +# ifndef NETBSD_LDAV_FILE +# define NETBSD_LDAV_FILE "/kern/loadavg" +# endif unsigned long int load_ave[3], scale; int count; @@ -619,26 +644,29 @@ getloadavg (loadavg, nelem) if (fp == NULL) return -1; count = fscanf (fp, "%lu %lu %lu %lu\n", - &load_ave[0], &load_ave[1], &load_ave[2], - &scale); + &load_ave[0], &load_ave[1], &load_ave[2], + &scale); (void) fclose (fp); if (count != 4) - return -1; + { + errno = ENOTSUP; + return -1; + } for (elem = 0; elem < nelem; elem++) loadavg[elem] = (double) load_ave[elem] / (double) scale; return elem; -#endif /* __NetBSD__ */ +# endif /* __NetBSD__ */ -#if !defined (LDAV_DONE) && defined (NeXT) -#define LDAV_DONE +# if !defined (LDAV_DONE) && defined (NeXT) /* NeXTStep */ +# define LDAV_DONE /* The NeXT code was adapted from iscreen 3.2. */ host_t host; struct processor_set_basic_info info; - unsigned info_count; + unsigned int info_count; /* We only know how to get the 1-minute average for this system, so even if the caller asks for more than 1, we only return 1. */ @@ -646,29 +674,32 @@ getloadavg (loadavg, nelem) if (!getloadavg_initialized) { if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) - getloadavg_initialized = 1; + getloadavg_initialized = true; } if (getloadavg_initialized) { info_count = PROCESSOR_SET_BASIC_INFO_COUNT; if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, - (processor_set_info_t) &info, &info_count) - != KERN_SUCCESS) - getloadavg_initialized = 0; + (processor_set_info_t) &info, &info_count) + != KERN_SUCCESS) + getloadavg_initialized = false; else - { - if (nelem > 0) - loadavg[elem++] = (double) info.load_average / LOAD_SCALE; - } + { + if (nelem > 0) + loadavg[elem++] = (double) info.load_average / LOAD_SCALE; + } } if (!getloadavg_initialized) - return -1; -#endif /* NeXT */ + { + errno = ENOTSUP; + return -1; + } +# endif /* NeXT */ -#if !defined (LDAV_DONE) && defined (UMAX) -#define LDAV_DONE +# if !defined (LDAV_DONE) && defined (UMAX) +# define LDAV_DONE /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not have a /dev/kmem. Information about the workings of the running kernel can be gathered with inq_stats system calls. @@ -692,24 +723,24 @@ getloadavg (loadavg, nelem) desc.sd_size = sizeof conf; if (inq_stats (1, &desc)) - return -1; + return -1; c = 0; for (i = 0; i < conf.config_maxclass; ++i) - { - struct class_stats stats; - bzero ((char *) &stats, sizeof stats); + { + struct class_stats stats; + memset (&stats, 0, sizeof stats); - desc.sd_type = CPUTYPE_CLASS; - desc.sd_objid = i; - desc.sd_addr = (char *) &stats; - desc.sd_size = sizeof stats; + desc.sd_type = CPUTYPE_CLASS; + desc.sd_objid = i; + desc.sd_addr = (char *) &stats; + desc.sd_size = sizeof stats; - if (inq_stats (1, &desc)) - return -1; + if (inq_stats (1, &desc)) + return -1; - c += stats.class_numcpus; - } + c += stats.class_numcpus; + } cpus = c; samples = cpus < 2 ? 3 : (2 * cpus / 3); } @@ -730,21 +761,21 @@ getloadavg (loadavg, nelem) { load += proc_sum_data.ps_nrun[j]; if (j++ == PS_NRUNSIZE) - j = 0; + j = 0; } if (nelem > 0) loadavg[elem++] = load / samples / cpus; -#endif /* UMAX */ +# endif /* UMAX */ -#if !defined (LDAV_DONE) && defined (DGUX) -#define LDAV_DONE +# if !defined (LDAV_DONE) && defined (DGUX) +# define LDAV_DONE /* This call can return -1 for an error, but with good args it's not supposed to fail. The first argument is for no - apparent reason of type `long int *'. */ + apparent reason of type 'long int *'. */ dg_sys_info ((long int *) &load_info, - DG_SYS_INFO_LOAD_INFO_TYPE, - DG_SYS_INFO_LOAD_VERSION_0); + DG_SYS_INFO_LOAD_INFO_TYPE, + DG_SYS_INFO_LOAD_VERSION_0); if (nelem > 0) loadavg[elem++] = load_info.one_minute; @@ -752,10 +783,10 @@ getloadavg (loadavg, nelem) loadavg[elem++] = load_info.five_minute; if (nelem > 2) loadavg[elem++] = load_info.fifteen_minute; -#endif /* DGUX */ +# endif /* DGUX */ -#if !defined (LDAV_DONE) && defined (apollo) -#define LDAV_DONE +# if !defined (LDAV_DONE) && defined (apollo) +# define LDAV_DONE /* Apollo code from lisch@mentorg.com (Ray Lischner). This system call is not documented. The load average is obtained as @@ -777,10 +808,10 @@ getloadavg (loadavg, nelem) loadavg[elem++] = load_ave[1] / 65536.0; if (nelem > 2) loadavg[elem++] = load_ave[2] / 65536.0; -#endif /* apollo */ +# endif /* apollo */ -#if !defined (LDAV_DONE) && defined (OSF_MIPS) -#define LDAV_DONE +# if !defined (LDAV_DONE) && defined (OSF_MIPS) +# define LDAV_DONE struct tbl_loadavg load_ave; table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); @@ -788,178 +819,193 @@ getloadavg (loadavg, nelem) = (load_ave.tl_lscale == 0 ? load_ave.tl_avenrun.d[0] : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); -#endif /* OSF_MIPS */ +# endif /* OSF_MIPS */ -#if !defined (LDAV_DONE) && (defined (MSDOS) || defined (WIN32)) -#define LDAV_DONE +# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) + /* DJGPP */ +# define LDAV_DONE /* A faithful emulation is going to have to be saved for a rainy day. */ for ( ; elem < nelem; elem++) { loadavg[elem] = 0.0; } -#endif /* MSDOS */ +# endif /* __MSDOS__ || WINDOWS32 */ -#if !defined (LDAV_DONE) && defined (OSF_ALPHA) -#define LDAV_DONE +# if !defined (LDAV_DONE) && defined (OSF_ALPHA) /* OSF/1 */ +# define LDAV_DONE struct tbl_loadavg load_ave; table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); for (elem = 0; elem < nelem; elem++) loadavg[elem] = (load_ave.tl_lscale == 0 - ? load_ave.tl_avenrun.d[elem] - : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale)); -#endif /* OSF_ALPHA */ + ? load_ave.tl_avenrun.d[elem] + : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale)); +# endif /* OSF_ALPHA */ -#if !defined (LDAV_DONE) && defined (VMS) +# if ! defined LDAV_DONE && defined __VMS /* VMS */ /* VMS specific code -- read from the Load Ave driver. */ LOAD_AVE_TYPE load_ave[3]; - static int getloadavg_initialized = 0; -#ifdef eunice + static bool getloadavg_initialized; +# ifdef eunice struct { int dsc$w_length; char *dsc$a_pointer; } descriptor; -#endif +# endif /* Ensure that there is a channel open to the load ave device. */ if (!getloadavg_initialized) { /* Attempt to open the channel. */ -#ifdef eunice +# ifdef eunice descriptor.dsc$w_length = 18; descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; -#else +# else $DESCRIPTOR (descriptor, "LAV0:"); -#endif +# endif if (sys$assign (&descriptor, &channel, 0, 0) & 1) - getloadavg_initialized = 1; + getloadavg_initialized = true; } /* Read the load average vector. */ if (getloadavg_initialized && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, - load_ave, 12, 0, 0, 0, 0) & 1)) + load_ave, 12, 0, 0, 0, 0) & 1)) { sys$dassgn (channel); - getloadavg_initialized = 0; + getloadavg_initialized = false; } if (!getloadavg_initialized) - return -1; -#endif /* VMS */ + { + errno = ENOTSUP; + return -1; + } +# endif /* ! defined LDAV_DONE && defined __VMS */ -#if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS) +# if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS + /* IRIX, other old systems */ /* UNIX-specific code -- read the average from /dev/kmem. */ -#define LDAV_PRIVILEGED /* This code requires special installation. */ +# define LDAV_PRIVILEGED /* This code requires special installation. */ LOAD_AVE_TYPE load_ave[3]; /* Get the address of LDAV_SYMBOL. */ if (offset == 0) { -#ifndef sgi -#ifndef NLIST_STRUCT - strcpy (nl[0].n_name, LDAV_SYMBOL); - strcpy (nl[1].n_name, ""); -#else /* NLIST_STRUCT */ -#ifdef NLIST_NAME_UNION - nl[0].n_un.n_name = LDAV_SYMBOL; - nl[1].n_un.n_name = 0; -#else /* not NLIST_NAME_UNION */ - nl[0].n_name = LDAV_SYMBOL; - nl[1].n_name = 0; -#endif /* not NLIST_NAME_UNION */ -#endif /* NLIST_STRUCT */ - -#ifndef SUNOS_5 +# ifndef sgi +# if ! defined NLIST_STRUCT || ! defined N_NAME_POINTER + strcpy (name_list[0].n_name, LDAV_SYMBOL); + strcpy (name_list[1].n_name, ""); +# else /* NLIST_STRUCT */ +# ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME + name_list[0].n_un.n_name = LDAV_SYMBOL; + name_list[1].n_un.n_name = 0; +# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ + name_list[0].n_name = LDAV_SYMBOL; + name_list[1].n_name = 0; +# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ +# endif /* NLIST_STRUCT */ + +# ifndef SUNOS_5 if ( -#if !(defined (_AIX) && !defined (ps2)) - nlist (KERNEL_FILE, nl) -#else /* _AIX */ - knlist (nl, 1, sizeof (nl[0])) -#endif - >= 0) - /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */ - { -#ifdef FIXUP_KERNEL_SYMBOL_ADDR - FIXUP_KERNEL_SYMBOL_ADDR (nl); -#endif - offset = nl[0].n_value; - } -#endif /* !SUNOS_5 */ -#else /* sgi */ - int ldav_off; - - ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); - if (ldav_off != -1) - offset = (long) ldav_off & 0x7fffffff; -#endif /* sgi */ - } +# if !(defined (_AIX) && !defined (ps2)) + nlist (KERNEL_FILE, name_list) +# else /* _AIX */ + knlist (name_list, 1, sizeof (name_list[0])) +# endif + >= 0) + /* Omit "&& name_list[0].n_type != 0 " -- it breaks on Sun386i. */ + { +# ifdef FIXUP_KERNEL_SYMBOL_ADDR + FIXUP_KERNEL_SYMBOL_ADDR (name_list); +# endif + offset = name_list[0].n_value; + } +# endif /* !SUNOS_5 */ +# else /* sgi */ + ptrdiff_t ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); + if (ldav_off != -1) + offset = (long int) ldav_off & 0x7fffffff; +# endif /* sgi */ + } /* Make sure we have /dev/kmem open. */ if (!getloadavg_initialized) { -#ifndef SUNOS_5 - channel = open ("/dev/kmem", 0); - if (channel >= 0) - { - /* Set the channel to close on exec, so it does not - litter any child's descriptor table. */ -#ifdef FD_SETFD -#ifndef FD_CLOEXEC -#define FD_CLOEXEC 1 -#endif - (void) fcntl (channel, F_SETFD, FD_CLOEXEC); -#endif - getloadavg_initialized = 1; - } -#else /* SUNOS_5 */ +# ifndef SUNOS_5 + /* Set the channel to close on exec, so it does not + litter any child's descriptor table. */ +# ifndef O_CLOEXEC +# define O_CLOEXEC 0 +# endif + int fd = open ("/dev/kmem", O_RDONLY | O_CLOEXEC); + if (0 <= fd) + { +# if F_DUPFD_CLOEXEC + if (fd <= STDERR_FILENO) + { + int fd1 = fcntl (fd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1); + close (fd); + fd = fd1; + } +# endif + if (0 <= fd) + { + channel = fd; + getloadavg_initialized = true; + } + } +# else /* SUNOS_5 */ /* We pass 0 for the kernel, corefile, and swapfile names - to use the currently running kernel. */ + to use the currently running kernel. */ kd = kvm_open (0, 0, 0, O_RDONLY, 0); if (kd != 0) - { - /* nlist the currently running kernel. */ - kvm_nlist (kd, nl); - offset = nl[0].n_value; - getloadavg_initialized = 1; - } -#endif /* SUNOS_5 */ + { + /* nlist the currently running kernel. */ + kvm_nlist (kd, name_list); + offset = name_list[0].n_value; + getloadavg_initialized = true; + } +# endif /* SUNOS_5 */ } /* If we can, get the load average values. */ if (offset && getloadavg_initialized) { /* Try to read the load. */ -#ifndef SUNOS_5 +# ifndef SUNOS_5 if (lseek (channel, offset, 0) == -1L - || read (channel, (char *) load_ave, sizeof (load_ave)) - != sizeof (load_ave)) - { - close (channel); - getloadavg_initialized = 0; - } -#else /* SUNOS_5 */ + || read (channel, (char *) load_ave, sizeof (load_ave)) + != sizeof (load_ave)) + { + close (channel); + getloadavg_initialized = false; + } +# else /* SUNOS_5 */ if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) - != sizeof (load_ave)) + != sizeof (load_ave)) { kvm_close (kd); - getloadavg_initialized = 0; - } -#endif /* SUNOS_5 */ + getloadavg_initialized = false; + } +# endif /* SUNOS_5 */ } if (offset == 0 || !getloadavg_initialized) - return -1; -#endif /* LOAD_AVE_TYPE and not VMS */ + { + errno = ENOTSUP; + return -1; + } +# endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ -#if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ +# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ if (nelem > 0) loadavg[elem++] = LDAV_CVT (load_ave[0]); if (nelem > 1) @@ -967,58 +1013,12 @@ getloadavg (loadavg, nelem) if (nelem > 2) loadavg[elem++] = LDAV_CVT (load_ave[2]); -#define LDAV_DONE -#endif /* !LDAV_DONE && LOAD_AVE_TYPE */ +# define LDAV_DONE +# endif /* !LDAV_DONE && LOAD_AVE_TYPE */ -#ifdef LDAV_DONE +# if !defined LDAV_DONE + errno = ENOSYS; + elem = -1; +# endif return elem; -#else - /* Set errno to zero to indicate that there was no particular error; - this function just can't work at all on this system. */ - errno = 0; - return -1; -#endif -} - -#endif /* ! HAVE_GETLOADAVG */ - -#ifdef TEST -void -main (argc, argv) - int argc; - char **argv; -{ - int naptime = 0; - - if (argc > 1) - naptime = atoi (argv[1]); - - while (1) - { - double avg[3]; - int loads; - - errno = 0; /* Don't be misled if it doesn't set errno. */ - loads = getloadavg (avg, 3); - if (loads == -1) - { - perror ("Error getting load average"); - exit (1); - } - if (loads > 0) - printf ("1-minute: %f ", avg[0]); - if (loads > 1) - printf ("5-minute: %f ", avg[1]); - if (loads > 2) - printf ("15-minute: %f ", avg[2]); - if (loads > 0) - putchar ('\n'); - - if (naptime == 0) - break; - sleep (naptime); - } - - exit (0); } -#endif /* TEST */