Initial revision

1 files changed, 737 insertions, 0 deletions

diff --git a/src/getloadavg.c b/src/getloadavg.c
new file mode 100644
index 00000000000..7c1c31705d8
--- /dev/null
+++ b/src/getloadavg.c
@@ -0,0 +1,737 @@
+/* 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]: Name of 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.
+
+   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
+#include "config.h"
+#endif
+
+/* 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__)
+#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.  */
+#if (defined(MORE_BSD) || defined(sun) || defined(decstation) || defined(_SEQUENT_) || defined(sgi) || defined(SVR4) || defined(sony_news) || defined(sequent) || defined (OSF_ALPHA) || (defined (ardent) && defined (titan)) || defined (tek4300))
+#define LOAD_AVE_TYPE long
+#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)
+#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.  */
+#if !defined(NLIST_STRUCT) && (defined(MORE_BSD) || defined(sun) || defined(decstation) || defined(hpux) || defined(_SEQUENT_) || defined(sequent) || defined(sgi) || defined(SVR4) || defined(sony_news) || defined (OSF_ALPHA) || (defined (ardent) && defined (titan)) || defined (tek4300) || defined (butterfly))
+#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 (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),
+   or -1 if an error occurred.  */
+
+int
+getloadavg (loadavg, nelem)
+     double loadavg[];
+     int nelem;
+{
+  int elem = 0;                 /* Return value.  */
+
+#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 (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;
+
+  if (nelem > 1)
+    {
+      /* We only know how to get the 1-minute average for this system.  */
+      errno = EINVAL;
+      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
+#define LDAV_PRIVILEGED
+
+  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] / 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 SUNOS_5
+#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 */
+
+      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;
+        }
+#else /* sgi */
+      int ldav_off;
+
+      ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
+      if (ldav_off != -1)
+        offset = (long) ldav_off & 0x7fffffff;
+#endif /* sgi */
+#endif  /* !SUNOS_5 */
+    }
+
+  /* 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 */
+      kd = kvm_open (0, 0, 0, O_RDONLY, 0);
+      if (kd != 0) 
+        {
+          kvm_nlist (kd, nl);
+          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
+}
+
+#ifdef TEST
+void
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  int naptime = 0;
+
+  if (argc > 1)
+    naptime = atoi (argv[1]);
+
+  if (naptime == 0)
+    naptime = 5;
+
+  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');
+      sleep (naptime);
+    }
+}
+#endif /* TEST */