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coreutils/lib/getloadavg.c
Paul Eggert 8bd8ca4bf3 Include unistd-safer.h. 
(getloadavg): Use fd_safer.
2005-04-11 20:02:28 +00:00

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/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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 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;
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__]: 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.
__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
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# 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 __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
# if defined (HAVE_FCNTL_H) || defined (_POSIX_VERSION)
# include <fcntl.h>
# else
# include <sys/file.h>
# endif
# include "unistd-safer.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 /* Not VMS or sgi */
# 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__)
# define LDAV_DONE
# undef LOAD_AVE_TYPE
# ifndef LINUX_LDAV_FILE
# define LINUX_LDAV_FILE "/proc/loadavg"
# endif
char ldavgbuf[3 * (INT_STRLEN_BOUND (long 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__ */
# 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 /* 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 = fd_safer (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 /* 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
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 */
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