diff options
Diffstat (limited to 'lib/getloadavg.c')
| -rw-r--r-- | lib/getloadavg.c | 1017 |
1 files changed, 0 insertions, 1017 deletions
diff --git a/lib/getloadavg.c b/lib/getloadavg.c deleted file mode 100644 index 687952715..000000000 --- a/lib/getloadavg.c +++ /dev/null @@ -1,1017 +0,0 @@ -/* Get the system load averages. - - Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994, - 1995, 1997, 1999, 2000, 2003, 2004, 2005 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. - - This program 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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, - USA. */ - -/* Compile-time symbols that this file uses: - - 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.in file. - 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, and - 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. - convex - DGUX - eunice UNIX emulator under VMS. - hpux - __MSDOS__ No-op for MSDOS. - NeXT - sgi - 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 - 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. - - 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 <config.h> -#endif - -#include <errno.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdlib.h> - -/* Exclude all the code except the test program at the end - if the system has its own `getloadavg' function. */ - -#ifndef HAVE_GETLOADAVG - -# include <sys/types.h> - -/* 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. */ -# if defined (unix) || defined (__unix) -# include <sys/param.h> -# endif - -# include "c-strtod.h" -# include "cloexec.h" -# include "intprops.h" -# include "xalloc.h" - -/* 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. - - 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 !defined (LDAV_CVT) && defined (LOAD_AVE_CVT) -# define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) -# endif - -# if !defined (BSD) && defined (ultrix) -/* Ultrix behaves like BSD on Vaxen. */ -# define BSD -# endif - -# ifdef NeXT -/* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which - conflicts with the definition understood in this file, that this - really is BSD. */ -# undef BSD - -/* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being - defined to mean that the nlist method should be used, which is not true. */ -# 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. */ - - -/* 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 (__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 <sys/mbuf.h> -# include <sys/socket.h> -# include <net/route.h> -# include <sys/table.h> -# endif - -# if defined (__osf__) && (defined (mips) || defined (__mips__)) -# define OSF_MIPS -# include <sys/table.h> -# endif - -/* UTek's /bin/cc on the 4300 has no architecture specific cpp define by - default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. 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 - - -/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ -# ifndef LOAD_AVE_TYPE - -# ifdef MORE_BSD -# define LOAD_AVE_TYPE long -# endif - -# ifdef sun -# define LOAD_AVE_TYPE long -# endif - -# ifdef decstation -# define LOAD_AVE_TYPE long -# endif - -# ifdef _SEQUENT_ -# define LOAD_AVE_TYPE long -# endif - -# ifdef sgi -# define LOAD_AVE_TYPE long -# endif - -# ifdef SVR4 -# define LOAD_AVE_TYPE long -# endif - -# ifdef sony_news -# define LOAD_AVE_TYPE long -# endif - -# ifdef sequent -# 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 - -# ifdef tek4300 -# 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 - -# ifdef convex -# define LOAD_AVE_TYPE double -# ifndef LDAV_CVT -# define LDAV_CVT(n) (n) -# endif -# endif - -# endif /* No LOAD_AVE_TYPE. */ - -# ifdef OSF_ALPHA -/* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, - according to ghazi@noc.rutgers.edu. */ -# undef FSCALE -# define FSCALE 1024.0 -# endif - -# if defined (alliant) && defined (i860) /* Alliant FX/2800 */ -/* <sys/param.h> 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 - - -# ifndef FSCALE - -/* SunOS and some others define FSCALE in sys/param.h. */ - -# ifdef MORE_BSD -# define FSCALE 2048.0 -# endif - -# if defined (MIPS) || defined (SVR4) || defined (decstation) -# define FSCALE 256 -# endif - -# 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 - -# endif /* Not FSCALE. */ - -# if !defined (LDAV_CVT) && defined (FSCALE) -# define LDAV_CVT(n) (((double) (n)) / FSCALE) -# endif - -# ifndef NLIST_STRUCT -# if HAVE_NLIST_H -# define NLIST_STRUCT -# endif -# endif - -# 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 (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 - -# include <unistd.h> - -/* 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 <a.out.h> -# else /* NLIST_STRUCT */ -# include <nlist.h> -# endif /* NLIST_STRUCT */ - -# ifdef SUNOS_5 -# include <fcntl.h> -# include <kvm.h> -# include <kstat.h> -# endif - -# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) -# include <sys/pstat.h> -# 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 <iodef.h> -# include <descrip.h> -# else /* eunice */ -# include <vms/iodef.h> -# endif /* eunice */ -# endif /* __VMS */ - -# ifndef LDAV_CVT -# define LDAV_CVT(n) ((double) (n)) -# endif /* !LDAV_CVT */ - -# endif /* LOAD_AVE_TYPE */ - -# 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 <mach/mach.h> -# else -# include <mach.h> -# endif -# endif /* NeXT */ - -# ifdef sgi -# include <sys/sysmp.h> -# endif /* sgi */ - -# ifdef UMAX -# include <signal.h> -# include <sys/time.h> -# include <sys/wait.h> -# include <sys/syscall.h> - -# ifdef UMAX_43 -# include <machine/cpu.h> -# include <inq_stats/statistics.h> -# include <inq_stats/sysstats.h> -# include <inq_stats/cpustats.h> -# include <inq_stats/procstats.h> -# else /* Not UMAX_43. */ -# include <sys/sysdefs.h> -# include <sys/statistics.h> -# include <sys/sysstats.h> -# include <sys/cpudefs.h> -# include <sys/cpustats.h> -# include <sys/procstats.h> -# endif /* Not UMAX_43. */ -# endif /* UMAX */ - -# ifdef DGUX -# include <sys/dg_sys_info.h> -# endif - -# include "fcntl--.h" - -/* Avoid static vars inside a function since in HPUX they dump as pure. */ - -# ifdef NeXT -static processor_set_t default_set; -static bool getloadavg_initialized; -# endif /* NeXT */ - -# ifdef UMAX -static unsigned int cpus = 0; -static unsigned int samples; -# endif /* UMAX */ - -# ifdef DGUX -static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ -# endif /* DGUX */ - -# if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE) -/* File descriptor open to /dev/kmem or VMS load ave driver. */ -static int channel; -/* True iff 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 - -# ifdef SUNOS_5 -static kvm_t *kd; -# endif /* SUNOS_5 */ - -# 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. */ - -int -getloadavg (double loadavg[], int nelem) -{ - 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; - elem = -1; -# endif - -# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) -/* Use libkstat because we don't have to be root. */ -# define LDAV_DONE - kstat_ctl_t *kc; - kstat_t *ksp; - kstat_named_t *kn; - - kc = kstat_open (); - 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; - - - kn = kstat_data_lookup (ksp, "avenrun_1min"); - if (kn == 0) - { - /* Return -1 if no load average information is available. */ - nelem = 0; - elem = -1; - } - - if (nelem >= 1) - 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; - } - } - } - - kstat_close (kc); -# endif /* HAVE_LIBKSTAT */ - -# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) -/* Use pstat_getdynamic() because we don't have to be root. */ -# define LDAV_DONE -# undef LOAD_AVE_TYPE - - 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 */ - -# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__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; - - fd = open (LINUX_LDAV_FILE, O_RDONLY); - if (fd == -1) - return -1; - count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); - (void) close (fd); - if (count <= 0) - return -1; - ldavgbuf[count] = '\0'; - - for (elem = 0; elem < nelem; elem++) - { - char *endptr; - double d = c_strtod (ptr, &endptr); - if (ptr == endptr) - { - if (elem == 0) - return -1; - break; - } - loadavg[elem] = d; - ptr = endptr; - } - - return elem; - -# endif /* __linux__ || __CYGWIN__ */ - -# if !defined (LDAV_DONE) && defined (__NetBSD__) -# define LDAV_DONE -# undef LOAD_AVE_TYPE - -# ifndef NETBSD_LDAV_FILE -# define NETBSD_LDAV_FILE "/kern/loadavg" -# endif - - unsigned long int load_ave[3], scale; - int count; - FILE *fp; - - fp = fopen (NETBSD_LDAV_FILE, "r"); - if (fp == NULL) - return -1; - count = fscanf (fp, "%lu %lu %lu %lu\n", - &load_ave[0], &load_ave[1], &load_ave[2], - &scale); - (void) fclose (fp); - if (count != 4) - return -1; - - for (elem = 0; elem < nelem; elem++) - loadavg[elem] = (double) load_ave[elem] / (double) scale; - - return elem; - -# endif /* __NetBSD__ */ - -# if !defined (LDAV_DONE) && defined (NeXT) -# define LDAV_DONE - /* The NeXT code was adapted from iscreen 3.2. */ - - host_t host; - struct processor_set_basic_info info; - 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. */ - - if (!getloadavg_initialized) - { - if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) - 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 = false; - else - { - if (nelem > 0) - loadavg[elem++] = (double) info.load_average / LOAD_SCALE; - } - } - - if (!getloadavg_initialized) - return -1; -# endif /* NeXT */ - -# 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. - We only know how to get the 1-minute average for this system. */ - - struct proc_summary proc_sum_data; - struct stat_descr proc_info; - double load; - register unsigned int i, j; - - if (cpus == 0) - { - register unsigned int c, i; - struct cpu_config conf; - struct stat_descr desc; - - desc.sd_next = 0; - desc.sd_subsys = SUBSYS_CPU; - desc.sd_type = CPUTYPE_CONFIG; - desc.sd_addr = (char *) &conf; - desc.sd_size = sizeof conf; - - if (inq_stats (1, &desc)) - return -1; - - c = 0; - for (i = 0; i < conf.config_maxclass; ++i) - { - struct class_stats stats; - bzero ((char *) &stats, 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; - - c += stats.class_numcpus; - } - cpus = c; - samples = cpus < 2 ? 3 : (2 * cpus / 3); - } - - proc_info.sd_next = 0; - proc_info.sd_subsys = SUBSYS_PROC; - proc_info.sd_type = PROCTYPE_SUMMARY; - proc_info.sd_addr = (char *) &proc_sum_data; - proc_info.sd_size = sizeof (struct proc_summary); - proc_info.sd_sizeused = 0; - - if (inq_stats (1, &proc_info) != 0) - return -1; - - load = proc_sum_data.ps_nrunnable; - j = 0; - for (i = samples - 1; i > 0; --i) - { - load += proc_sum_data.ps_nrun[j]; - if (j++ == PS_NRUNSIZE) - j = 0; - } - - if (nelem > 0) - loadavg[elem++] = load / samples / cpus; -# endif /* UMAX */ - -# 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 *'. */ - dg_sys_info ((long int *) &load_info, - DG_SYS_INFO_LOAD_INFO_TYPE, - DG_SYS_INFO_LOAD_VERSION_0); - - if (nelem > 0) - loadavg[elem++] = load_info.one_minute; - if (nelem > 1) - loadavg[elem++] = load_info.five_minute; - if (nelem > 2) - loadavg[elem++] = load_info.fifteen_minute; -# endif /* DGUX */ - -# 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 - three long integers, for the load average over the past minute, - five minutes, and fifteen minutes. Each value is a scaled integer, - with 16 bits of integer part and 16 bits of fraction part. - - I'm not sure which operating system first supported this system call, - but I know that SR10.2 supports it. */ - - extern void proc1_$get_loadav (); - unsigned long load_ave[3]; - - proc1_$get_loadav (load_ave); - - if (nelem > 0) - loadavg[elem++] = load_ave[0] / 65536.0; - if (nelem > 1) - loadavg[elem++] = load_ave[1] / 65536.0; - if (nelem > 2) - loadavg[elem++] = load_ave[2] / 65536.0; -# endif /* apollo */ - -# 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)); - loadavg[elem++] - = (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 */ - -# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) -# 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__ || WINDOWS32 */ - -# if !defined (LDAV_DONE) && defined (OSF_ALPHA) -# 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 */ - -# if ! defined LDAV_DONE && defined __VMS - /* VMS specific code -- read from the Load Ave driver. */ - - LOAD_AVE_TYPE load_ave[3]; - static bool getloadavg_initialized; -# ifdef eunice - struct - { - int dsc$w_length; - char *dsc$a_pointer; - } descriptor; -# endif - - /* Ensure that there is a channel open to the load ave device. */ - if (!getloadavg_initialized) - { - /* Attempt to open the channel. */ -# ifdef eunice - descriptor.dsc$w_length = 18; - descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; -# else - $DESCRIPTOR (descriptor, "LAV0:"); -# endif - if (sys$assign (&descriptor, &channel, 0, 0) & 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)) - { - sys$dassgn (channel); - getloadavg_initialized = false; - } - - if (!getloadavg_initialized) - return -1; -# endif /* ! defined LDAV_DONE && defined __VMS */ - -# if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS - - /* UNIX-specific code -- read the average from /dev/kmem. */ - -# 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 HAVE_STRUCT_NLIST_N_UN_N_NAME - nl[0].n_un.n_name = LDAV_SYMBOL; - nl[1].n_un.n_name = 0; -# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ - nl[0].n_name = LDAV_SYMBOL; - nl[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 int) ldav_off & 0x7fffffff; -# endif /* sgi */ - } - - /* Make sure we have /dev/kmem open. */ - if (!getloadavg_initialized) - { -# ifndef SUNOS_5 - channel = open ("/dev/kmem", O_RDONLY); - if (channel >= 0) - { - /* Set the channel to close on exec, so it does not - litter any child's descriptor table. */ - set_cloexec_flag (channel, true); - getloadavg_initialized = true; - } -# else /* SUNOS_5 */ - /* We pass 0 for the kernel, corefile, and swapfile names - 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 = true; - } -# endif /* SUNOS_5 */ - } - - /* If we can, get the load average values. */ - if (offset && getloadavg_initialized) - { - /* Try to read the load. */ -# ifndef SUNOS_5 - if (lseek (channel, offset, 0) == -1L - || 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)) - { - kvm_close (kd); - getloadavg_initialized = false; - } -# endif /* SUNOS_5 */ - } - - if (offset == 0 || !getloadavg_initialized) - return -1; -# endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ - -# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ - if (nelem > 0) - loadavg[elem++] = LDAV_CVT (load_ave[0]); - if (nelem > 1) - loadavg[elem++] = LDAV_CVT (load_ave[1]); - if (nelem > 2) - loadavg[elem++] = LDAV_CVT (load_ave[2]); - -# define LDAV_DONE -# endif /* !LDAV_DONE && LOAD_AVE_TYPE */ - -# if !defined 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; - elem = -1; -# endif - return elem; -} - -#endif /* ! HAVE_GETLOADAVG */ - -#ifdef TEST -int -main (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"); - return EXIT_FAILURE; - } - 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); - } - - return EXIT_SUCCESS; -} -#endif /* TEST */ |