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- /* Get the system load averages.
- Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93
- Free Software Foundation, Inc.
-
- 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* 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.
-
- Specific system predefines this file uses, aside from setting
- default values if not emacs:
-
- apollo
- BSD Real BSD, not just BSD-like.
- DGUX
- eunice UNIX emulator under VMS.
- hpux
- 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
- __linux__ Linux: assumes /proc filesystem mounted.
- Support from Michael K. Johnson.
- __NetBSD__ NetBSD: assumes /kern filesystem 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. */
-
- #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. */
- #ifdef unix
- #include <sys/param.h>
- #endif
-
-
- #ifdef HAVE_CONFIG_H
- #if defined (emacs) || defined (CONFIG_BROKETS)
- /* We use <config.h> instead of "config.h" so that a compilation
- using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
- (which it would do because it found this file in $srcdir). */
- #include <config.h>
- #else
- #include "config.h"
- #endif
- #endif
-
-
- /* Exclude all the code except the test program at the end
- if the system has its own `getloadavg' function. */
-
- #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.
-
- 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
-
- /* 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(hp300) && !defined(hpux)
- #define MORE_BSD
- #endif
-
- #if defined(ultrix) && defined(mips)
- #define decstation
- #endif
-
- #if defined(sun) && defined(SVR4)
- #define SUNOS_5
- #endif
-
- #if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
- #define OSF_ALPHA
- #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
-
- #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
-
-
- #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
-
- #endif /* Not FSCALE. */
-
- #if !defined (LDAV_CVT) && defined (FSCALE)
- #define LDAV_CVT(n) (((double) (n)) / FSCALE)
- #endif
-
- /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
- #ifndef NLIST_STRUCT
-
- #ifdef MORE_BSD
- #define NLIST_STRUCT
- #endif
-
- #ifdef sun
- #define NLIST_STRUCT
- #endif
-
- #ifdef decstation
- #define NLIST_STRUCT
- #endif
-
- #ifdef hpux
- #define NLIST_STRUCT
- #endif
-
- #if defined (_SEQUENT_) || defined (sequent)
- #define NLIST_STRUCT
- #endif
-
- #ifdef sgi
- #define NLIST_STRUCT
- #endif
-
- #ifdef SVR4
- #define NLIST_STRUCT
- #endif
-
- #ifdef sony_news
- #define NLIST_STRUCT
- #endif
-
- #ifdef OSF_ALPHA
- #define NLIST_STRUCT
- #endif
-
- #if defined (ardent) && defined (titan)
- #define NLIST_STRUCT
- #endif
-
- #ifdef tex4300
- #define NLIST_STRUCT
- #endif
-
- #ifdef butterfly
- #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)))
- #define LDAV_SYMBOL "avenrun"
- #endif
-
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
-
- #include <stdio.h>
- #include <errno.h>
-
- #ifndef errno
- extern int errno;
- #endif
-
- /* 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 NLIST_STRUCT
- #include <a.out.h>
- #else /* NLIST_STRUCT */
- #include <nlist.h>
- #endif /* NLIST_STRUCT */
-
- #ifdef SUNOS_5
- #include <fcntl.h>
- #include <kvm.h>
- #endif
-
- #ifndef KERNEL_FILE
- #define KERNEL_FILE "/vmunix"
- #endif /* KERNEL_FILE */
-
- #ifndef LDAV_SYMBOL
- #define LDAV_SYMBOL "_avenrun"
- #endif /* LDAV_SYMBOL */
-
- #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 */
-
- #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 <stdio.h>
- #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
-
- #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
- #include <fcntl.h>
- #else
- #include <sys/file.h>
- #endif
-
- /* Avoid static vars inside a function since in HPUX they dump as pure. */
-
- #ifdef NeXT
- static processor_set_t default_set;
- static int 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 */
-
- #ifdef 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;
- /* Offset in kmem to seek to read load average, or 0 means invalid. */
- static long offset;
-
- #if !defined(VMS) && !defined(sgi)
- static struct nlist nl[2];
- #endif /* Not VMS or sgi */
-
- #ifdef SUNOS_5
- static kvm_t *kd;
- #endif /* SUNOS_5 */
-
- #endif /* LOAD_AVE_TYPE */
-
- /* 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 (loadavg, nelem)
- double loadavg[];
- int nelem;
- {
- int elem = 0; /* Return value. */
-
- #ifdef __amigados
- #define NO_GET_LOAD_AVG
- #endif
-
- #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 (__linux__)
- #define LDAV_DONE
- #undef LOAD_AVE_TYPE
-
- #ifndef LINUX_LDAV_FILE
- #define LINUX_LDAV_FILE "/proc/loadavg"
- #endif
-
- char ldavgbuf[40];
- double load_ave[3];
- int fd, count;
-
- fd = open (LINUX_LDAV_FILE, O_RDONLY);
- if (fd == -1)
- return -1;
- count = read (fd, ldavgbuf, 40);
- (void) close (fd);
- if (count <= 0)
- return -1;
-
- 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 < count; elem++)
- loadavg[elem] = load_ave[elem];
-
- return elem;
-
- #endif /* __linux__ */
-
- #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 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 = 1;
- }
-
- 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;
- 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_$get_loadav (load_ave);
-
- if (nelem > 0)
- loadavg[elem++] = load_ave[0] / 65536.0;
- if (nelem > 1)
- loadavg[elem++] = load_ave[1] / 65536.0;
- if (nelem > 2)
- loadavg[elem++] = load_ave[2] / 65536.0;
- #endif /* apollo */
-
- #if !defined (LDAV_DONE) && defined (OSF_MIPS)
- #define LDAV_DONE
-
- struct tbl_loadavg load_ave;
- table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
- loadavg[elem++]
- = (load_ave.tl_lscale == 0
- ? load_ave.tl_avenrun.d[0]
- : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
- #endif /* OSF_MIPS */
-
- #if !defined (LDAV_DONE) && defined (VMS)
- /* VMS specific code -- read from the Load Ave driver. */
-
- LOAD_AVE_TYPE load_ave[3];
- static int getloadavg_initialized = 0;
- #ifdef eunice
- struct
- {
- int dsc$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 = 1;
- }
-
- /* 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 = 0;
- }
-
- if (!getloadavg_initialized)
- return -1;
- #endif /* 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 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
- if (nlist (KERNEL_FILE, nl) >= 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 */
- }
-
- /* Make sure we have /dev/kmem open. */
- if (!getloadavg_initialized)
- {
- #ifndef SUNOS_5
- channel = open ("/dev/kmem", 0);
- if (channel >= 0)
- getloadavg_initialized = 1;
- #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 = 1;
- }
- #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 = 0;
- }
- #else /* SUNOS_5 */
- if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
- != sizeof (load_ave))
- {
- kvm_close (kd);
- getloadavg_initialized = 0;
- }
- #endif /* SUNOS_5 */
- }
-
- if (offset == 0 || !getloadavg_initialized)
- return -1;
- #endif /* LOAD_AVE_TYPE and not 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 */
-
- #ifdef LDAV_DONE
- 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 */
-