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1/* Get the system load averages.
2Copyright (C) 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
31995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free
4Software Foundation, Inc.
5
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License along with
17this program; see the file COPYING. If not, write to the Free Software
18Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
19
20/* Compile-time symbols that this file uses:
21
22 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
23 pstat_getdynamic function. I think it
24 is unique to HPUX9. The best way to get the
25 definition is through the AC_FUNC_GETLOADAVG
26 macro that comes with autoconf 2.13 or newer.
27 If that isn't an option, then just put
28 AC_CHECK_FUNCS(pstat_getdynamic) in your
29 configure.in file.
30 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
31 KERNEL_FILE Pathname of the kernel to nlist.
32 LDAV_CVT() Scale the load average from the kernel.
33 Returns a double.
34 LDAV_SYMBOL Name of kernel symbol giving load average.
35 LOAD_AVE_TYPE Type of the load average array in the kernel.
36 Must be defined unless one of
37 apollo, DGUX, NeXT, or UMAX is defined;
38 or we have libkstat;
39 otherwise, no load average is available.
40 NLIST_STRUCT Include nlist.h, not a.out.h, and
41 the nlist n_name element is a pointer,
42 not an array.
43 HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
44 LINUX_LDAV_FILE [__linux__]: File containing load averages.
45
46 Specific system predefines this file uses, aside from setting
47 default values if not emacs:
48
49 apollo
50 BSD Real BSD, not just BSD-like.
51 convex
52 DGUX
53 eunice UNIX emulator under VMS.
54 hpux
55 __MSDOS__ No-op for MSDOS.
56 NeXT
57 sgi
58 sequent Sequent Dynix 3.x.x (BSD)
59 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
60 sony_news NEWS-OS (works at least for 4.1C)
61 UMAX
62 UMAX4_3
63 VMS
64 WINDOWS32 No-op for Windows95/NT.
65 __linux__ Linux: assumes /proc filesystem mounted.
66 Support from Michael K. Johnson.
67 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
68
69 In addition, to avoid nesting many #ifdefs, we internally set
70 LDAV_DONE to indicate that the load average has been computed.
71
72 We also #define LDAV_PRIVILEGED if a program will require
73 special installation to be able to call getloadavg. */
74
75/* This should always be first. */
76#ifdef HAVE_CONFIG_H
77# include <config.h>
78#endif
79
80#include <sys/types.h>
81
82/* Both the Emacs and non-Emacs sections want this. Some
83 configuration files' definitions for the LOAD_AVE_CVT macro (like
84 sparc.h's) use macros like FSCALE, defined here. */
85#if defined (unix) || defined (__unix)
86# include <sys/param.h>
87#endif
88
89
90/* Exclude all the code except the test program at the end
91 if the system has its own `getloadavg' function.
92
93 The declaration of `errno' is needed by the test program
94 as well as the function itself, so it comes first. */
95
96#include <errno.h>
97
98#ifndef errno
99extern int errno;
100#endif
101
102#if HAVE_LOCALE_H
103# include <locale.h>
104#endif
105#if !HAVE_SETLOCALE
106# define setlocale(Category, Locale) /* empty */
107#endif
108
109#ifndef HAVE_GETLOADAVG
110
111
112/* The existing Emacs configuration files define a macro called
113 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
114 returns the load average multiplied by 100. What we actually want
115 is a macro called LDAV_CVT, which returns the load average as an
116 unmultiplied double.
117
118 For backwards compatibility, we'll define LDAV_CVT in terms of
119 LOAD_AVE_CVT, but future machine config files should just define
120 LDAV_CVT directly. */
121
122# if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
123# define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
124# endif
125
126# if !defined (BSD) && defined (ultrix)
127/* Ultrix behaves like BSD on Vaxen. */
128# define BSD
129# endif
130
131# ifdef NeXT
132/* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
133 conflicts with the definition understood in this file, that this
134 really is BSD. */
135# undef BSD
136
137/* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
138 defined to mean that the nlist method should be used, which is not true. */
139# undef FSCALE
140# endif
141
142/* Same issues as for NeXT apply to the HURD-based GNU system. */
143# ifdef __GNU__
144# undef BSD
145# undef FSCALE
146# endif /* __GNU__ */
147
148/* Set values that are different from the defaults, which are
149 set a little farther down with #ifndef. */
150
151
152/* Some shorthands. */
153
154# if defined (HPUX) && !defined (hpux)
155# define hpux
156# endif
157
158# if defined (__hpux) && !defined (hpux)
159# define hpux
160# endif
161
162# if defined (__sun) && !defined (sun)
163# define sun
164# endif
165
166# if defined(hp300) && !defined(hpux)
167# define MORE_BSD
168# endif
169
170# if defined(ultrix) && defined(mips)
171# define decstation
172# endif
173
174# if defined (__SVR4) && !defined (SVR4)
175# define SVR4
176# endif
177
178# if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
179# define SUNOS_5
180# endif
181
182# if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
183# define OSF_ALPHA
184# include <sys/mbuf.h>
185# include <sys/socket.h>
186# include <net/route.h>
187# include <sys/table.h>
188# endif
189
190# if defined (__osf__) && (defined (mips) || defined (__mips__))
191# define OSF_MIPS
192# include <sys/table.h>
193# endif
194
195/* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
196 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
197 that with a couple of other things and we'll have a unique match. */
198# if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
199# define tek4300 /* Define by emacs, but not by other users. */
200# endif
201
202/* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
203# if defined(__QNX__)
204# undef SVR4
205# endif
206
207/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
208# ifndef LOAD_AVE_TYPE
209
210# ifdef MORE_BSD
211# define LOAD_AVE_TYPE long
212# endif
213
214# ifdef sun
215# define LOAD_AVE_TYPE long
216# endif
217
218# ifdef decstation
219# define LOAD_AVE_TYPE long
220# endif
221
222# ifdef _SEQUENT_
223# define LOAD_AVE_TYPE long
224# endif
225
226# ifdef sgi
227# define LOAD_AVE_TYPE long
228# endif
229
230# ifdef SVR4
231# define LOAD_AVE_TYPE long
232# endif
233
234# ifdef sony_news
235# define LOAD_AVE_TYPE long
236# endif
237
238# ifdef sequent
239# define LOAD_AVE_TYPE long
240# endif
241
242# ifdef OSF_ALPHA
243# define LOAD_AVE_TYPE long
244# endif
245
246# if defined (ardent) && defined (titan)
247# define LOAD_AVE_TYPE long
248# endif
249
250# ifdef tek4300
251# define LOAD_AVE_TYPE long
252# endif
253
254# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
255# define LOAD_AVE_TYPE long
256# endif
257
258# ifdef _AIX
259# define LOAD_AVE_TYPE long
260# endif
261
262# ifdef convex
263# define LOAD_AVE_TYPE double
264# ifndef LDAV_CVT
265# define LDAV_CVT(n) (n)
266# endif
267# endif
268
269# endif /* No LOAD_AVE_TYPE. */
270
271# ifdef OSF_ALPHA
272/* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
273 according to ghazi@noc.rutgers.edu. */
274# undef FSCALE
275# define FSCALE 1024.0
276# endif
277
278# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
279/* <sys/param.h> defines an incorrect value for FSCALE on an
280 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
281# undef FSCALE
282# define FSCALE 100.0
283# endif
284
285
286# ifndef FSCALE
287
288/* SunOS and some others define FSCALE in sys/param.h. */
289
290# ifdef MORE_BSD
291# define FSCALE 2048.0
292# endif
293
294# if defined(MIPS) || defined(SVR4) || defined(decstation)
295# define FSCALE 256
296# endif
297
298# if defined (sgi) || defined (sequent)
299/* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
300 above under #ifdef MIPS. But we want the sgi value. */
301# undef FSCALE
302# define FSCALE 1000.0
303# endif
304
305# if defined (ardent) && defined (titan)
306# define FSCALE 65536.0
307# endif
308
309# ifdef tek4300
310# define FSCALE 100.0
311# endif
312
313# ifdef _AIX
314# define FSCALE 65536.0
315# endif
316
317# endif /* Not FSCALE. */
318
319# if !defined (LDAV_CVT) && defined (FSCALE)
320# define LDAV_CVT(n) (((double) (n)) / FSCALE)
321# endif
322
323
324# if defined(sgi) || (defined(mips) && !defined(BSD))
325# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
326# endif
327
328
329# if !defined (KERNEL_FILE) && defined (sequent)
330# define KERNEL_FILE "/dynix"
331# endif
332
333# if !defined (KERNEL_FILE) && defined (hpux)
334# define KERNEL_FILE "/hp-ux"
335# endif
336
337# if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
338# define KERNEL_FILE "/unix"
339# endif
340
341
342# if !defined (LDAV_SYMBOL) && defined (alliant)
343# define LDAV_SYMBOL "_Loadavg"
344# endif
345
346# if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
347# define LDAV_SYMBOL "avenrun"
348# endif
349
350# ifdef HAVE_UNISTD_H
351# include <unistd.h>
352# endif
353
354# include <stdio.h>
355
356/* LOAD_AVE_TYPE should only get defined if we're going to use the
357 nlist method. */
358# if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) && !defined(__riscos__)
359# define LOAD_AVE_TYPE double
360# endif
361
362# ifdef LOAD_AVE_TYPE
363
364# ifndef VMS
365# ifndef __linux__
366# ifdef HAVE_NLIST_H
367# include <nlist.h>
368# else
369# include <a.out.h>
370# endif
371
372# ifdef SUNOS_5
373# include <fcntl.h>
374# include <kvm.h>
375# include <kstat.h>
376# endif
377
378# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
379# include <sys/pstat.h>
380# endif
381
382# ifndef KERNEL_FILE
383# define KERNEL_FILE "/vmunix"
384# endif /* KERNEL_FILE */
385
386# ifndef LDAV_SYMBOL
387# define LDAV_SYMBOL "_avenrun"
388# endif /* LDAV_SYMBOL */
389# endif /* __linux__ */
390
391# else /* VMS */
392
393# ifndef eunice
394# include <iodef.h>
395# include <descrip.h>
396# else /* eunice */
397# include <vms/iodef.h>
398# endif /* eunice */
399# endif /* VMS */
400
401# ifndef LDAV_CVT
402# define LDAV_CVT(n) ((double) (n))
403# endif /* !LDAV_CVT */
404
405# endif /* LOAD_AVE_TYPE */
406
407# if defined(__GNU__) && !defined (NeXT)
408/* Note that NeXT Openstep defines __GNU__ even though it should not. */
409/* GNU system acts much like NeXT, for load average purposes,
410 but not exactly. */
411# define NeXT
412# define host_self mach_host_self
413# endif
414
415# ifdef NeXT
416# ifdef HAVE_MACH_MACH_H
417# include <mach/mach.h>
418# else
419# include <mach.h>
420# endif
421# endif /* NeXT */
422
423# ifdef sgi
424# include <sys/sysmp.h>
425# endif /* sgi */
426
427# ifdef UMAX
428# include <stdio.h>
429# include <signal.h>
430# include <sys/time.h>
431# include <sys/wait.h>
432# include <sys/syscall.h>
433
434# ifdef UMAX_43
435# include <machine/cpu.h>
436# include <inq_stats/statistics.h>
437# include <inq_stats/sysstats.h>
438# include <inq_stats/cpustats.h>
439# include <inq_stats/procstats.h>
440# else /* Not UMAX_43. */
441# include <sys/sysdefs.h>
442# include <sys/statistics.h>
443# include <sys/sysstats.h>
444# include <sys/cpudefs.h>
445# include <sys/cpustats.h>
446# include <sys/procstats.h>
447# endif /* Not UMAX_43. */
448# endif /* UMAX */
449
450# ifdef DGUX
451# include <sys/dg_sys_info.h>
452# endif
453
454# if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
455# include <fcntl.h>
456# else
457# include <sys/file.h>
458# endif
459
460
461
462/* Avoid static vars inside a function since in HPUX they dump as pure. */
463
464# ifdef NeXT
465static processor_set_t default_set;
466static int getloadavg_initialized;
467# endif /* NeXT */
468
469# ifdef UMAX
470static unsigned int cpus = 0;
471static unsigned int samples;
472# endif /* UMAX */
473
474# ifdef DGUX
475static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
476# endif /* DGUX */
477
478#if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
479/* File descriptor open to /dev/kmem or VMS load ave driver. */
480static int channel;
481/* Nonzero iff channel is valid. */
482static int getloadavg_initialized;
483/* Offset in kmem to seek to read load average, or 0 means invalid. */
484static long offset;
485
486#if !defined(VMS) && !defined(sgi) && !defined(__linux__)
487static struct nlist nl[2];
488#endif /* Not VMS or sgi */
489
490#ifdef SUNOS_5
491static kvm_t *kd;
492#endif /* SUNOS_5 */
493
494#endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
495
496
497/* Put the 1 minute, 5 minute and 15 minute load averages
498 into the first NELEM elements of LOADAVG.
499 Return the number written (never more than 3, but may be less than NELEM),
500 or -1 if an error occurred. */
501
502int
503getloadavg (double loadavg[], int nelem)
504{
505 int elem = 0; /* Return value. */
506
507# ifdef NO_GET_LOAD_AVG
508# define LDAV_DONE
509 /* Set errno to zero to indicate that there was no particular error;
510 this function just can't work at all on this system. */
511 errno = 0;
512 elem = -1;
513# endif
514
515# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
516/* Use libkstat because we don't have to be root. */
517# define LDAV_DONE
518 kstat_ctl_t *kc;
519 kstat_t *ksp;
520 kstat_named_t *kn;
521
522 kc = kstat_open ();
523 if (kc == 0)
524 return -1;
525 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
526 if (ksp == 0 )
527 return -1;
528 if (kstat_read (kc, ksp, 0) == -1)
529 return -1;
530
531
532 kn = kstat_data_lookup (ksp, "avenrun_1min");
533 if (kn == 0)
534 {
535 /* Return -1 if no load average information is available. */
536 nelem = 0;
537 elem = -1;
538 }
539
540 if (nelem >= 1)
541 loadavg[elem++] = (double) kn->value.ul/FSCALE;
542
543 if (nelem >= 2)
544 {
545 kn = kstat_data_lookup (ksp, "avenrun_5min");
546 if (kn != 0)
547 {
548 loadavg[elem++] = (double) kn->value.ul/FSCALE;
549
550 if (nelem >= 3)
551 {
552 kn = kstat_data_lookup (ksp, "avenrun_15min");
553 if (kn != 0)
554 loadavg[elem++] = (double) kn->value.ul/FSCALE;
555 }
556 }
557 }
558
559 kstat_close (kc);
560# endif /* HAVE_LIBKSTAT */
561
562# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
563/* Use pstat_getdynamic() because we don't have to be root. */
564# define LDAV_DONE
565# undef LOAD_AVE_TYPE
566
567 struct pst_dynamic dyn_info;
568 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
569 return -1;
570 if (nelem > 0)
571 loadavg[elem++] = dyn_info.psd_avg_1_min;
572 if (nelem > 1)
573 loadavg[elem++] = dyn_info.psd_avg_5_min;
574 if (nelem > 2)
575 loadavg[elem++] = dyn_info.psd_avg_15_min;
576
577# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
578
579# if !defined (LDAV_DONE) && defined (__linux__)
580# define LDAV_DONE
581# undef LOAD_AVE_TYPE
582
583# ifndef LINUX_LDAV_FILE
584# define LINUX_LDAV_FILE "/proc/loadavg"
585# endif
586
587 char ldavgbuf[40];
588 double load_ave[3];
589 int fd, count;
590
591 fd = open (LINUX_LDAV_FILE, O_RDONLY);
592 if (fd == -1)
593 return -1;
594 count = read (fd, ldavgbuf, 40);
595 (void) close (fd);
596 if (count <= 0)
597 return -1;
598
599 /* The following sscanf must use the C locale. */
600 setlocale (LC_NUMERIC, "C");
601 count = sscanf (ldavgbuf, "%lf %lf %lf",
602 &load_ave[0], &load_ave[1], &load_ave[2]);
603 setlocale (LC_NUMERIC, "");
604 if (count < 1)
605 return -1;
606
607 for (elem = 0; elem < nelem && elem < count; elem++)
608 loadavg[elem] = load_ave[elem];
609
610 return elem;
611
612# endif /* __linux__ */
613
614# if !defined (LDAV_DONE) && defined (__NetBSD__)
615# define LDAV_DONE
616# undef LOAD_AVE_TYPE
617
618# ifndef NETBSD_LDAV_FILE
619# define NETBSD_LDAV_FILE "/kern/loadavg"
620# endif
621
622 unsigned long int load_ave[3], scale;
623 int count;
624 FILE *fp;
625
626 fp = fopen (NETBSD_LDAV_FILE, "r");
627 if (fp == NULL)
628 return -1;
629 count = fscanf (fp, "%lu %lu %lu %lu\n",
630 &load_ave[0], &load_ave[1], &load_ave[2],
631 &scale);
632 (void) fclose (fp);
633 if (count != 4)
634 return -1;
635
636 for (elem = 0; elem < nelem; elem++)
637 loadavg[elem] = (double) load_ave[elem] / (double) scale;
638
639 return elem;
640
641# endif /* __NetBSD__ */
642
643# if !defined (LDAV_DONE) && defined (NeXT)
644# define LDAV_DONE
645 /* The NeXT code was adapted from iscreen 3.2. */
646
647 host_t host;
648 struct processor_set_basic_info info;
649 unsigned info_count;
650
651 /* We only know how to get the 1-minute average for this system,
652 so even if the caller asks for more than 1, we only return 1. */
653
654 if (!getloadavg_initialized)
655 {
656 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
657 getloadavg_initialized = 1;
658 }
659
660 if (getloadavg_initialized)
661 {
662 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
663 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
664 (processor_set_info_t) &info, &info_count)
665 != KERN_SUCCESS)
666 getloadavg_initialized = 0;
667 else
668 {
669 if (nelem > 0)
670 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
671 }
672 }
673
674 if (!getloadavg_initialized)
675 return -1;
676# endif /* NeXT */
677
678# if !defined (LDAV_DONE) && defined (UMAX)
679# define LDAV_DONE
680/* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
681 have a /dev/kmem. Information about the workings of the running kernel
682 can be gathered with inq_stats system calls.
683 We only know how to get the 1-minute average for this system. */
684
685 struct proc_summary proc_sum_data;
686 struct stat_descr proc_info;
687 double load;
688 register unsigned int i, j;
689
690 if (cpus == 0)
691 {
692 register unsigned int c, i;
693 struct cpu_config conf;
694 struct stat_descr desc;
695
696 desc.sd_next = 0;
697 desc.sd_subsys = SUBSYS_CPU;
698 desc.sd_type = CPUTYPE_CONFIG;
699 desc.sd_addr = (char *) &conf;
700 desc.sd_size = sizeof conf;
701
702 if (inq_stats (1, &desc))
703 return -1;
704
705 c = 0;
706 for (i = 0; i < conf.config_maxclass; ++i)
707 {
708 struct class_stats stats;
709 memset (&stats, '\0', sizeof stats);
710
711 desc.sd_type = CPUTYPE_CLASS;
712 desc.sd_objid = i;
713 desc.sd_addr = (char *) &stats;
714 desc.sd_size = sizeof stats;
715
716 if (inq_stats (1, &desc))
717 return -1;
718
719 c += stats.class_numcpus;
720 }
721 cpus = c;
722 samples = cpus < 2 ? 3 : (2 * cpus / 3);
723 }
724
725 proc_info.sd_next = 0;
726 proc_info.sd_subsys = SUBSYS_PROC;
727 proc_info.sd_type = PROCTYPE_SUMMARY;
728 proc_info.sd_addr = (char *) &proc_sum_data;
729 proc_info.sd_size = sizeof (struct proc_summary);
730 proc_info.sd_sizeused = 0;
731
732 if (inq_stats (1, &proc_info) != 0)
733 return -1;
734
735 load = proc_sum_data.ps_nrunnable;
736 j = 0;
737 for (i = samples - 1; i > 0; --i)
738 {
739 load += proc_sum_data.ps_nrun[j];
740 if (j++ == PS_NRUNSIZE)
741 j = 0;
742 }
743
744 if (nelem > 0)
745 loadavg[elem++] = load / samples / cpus;
746# endif /* UMAX */
747
748# if !defined (LDAV_DONE) && defined (DGUX)
749# define LDAV_DONE
750 /* This call can return -1 for an error, but with good args
751 it's not supposed to fail. The first argument is for no
752 apparent reason of type `long int *'. */
753 dg_sys_info ((long int *) &load_info,
754 DG_SYS_INFO_LOAD_INFO_TYPE,
755 DG_SYS_INFO_LOAD_VERSION_0);
756
757 if (nelem > 0)
758 loadavg[elem++] = load_info.one_minute;
759 if (nelem > 1)
760 loadavg[elem++] = load_info.five_minute;
761 if (nelem > 2)
762 loadavg[elem++] = load_info.fifteen_minute;
763# endif /* DGUX */
764
765# if !defined (LDAV_DONE) && defined (apollo)
766# define LDAV_DONE
767/* Apollo code from lisch@mentorg.com (Ray Lischner).
768
769 This system call is not documented. The load average is obtained as
770 three long integers, for the load average over the past minute,
771 five minutes, and fifteen minutes. Each value is a scaled integer,
772 with 16 bits of integer part and 16 bits of fraction part.
773
774 I'm not sure which operating system first supported this system call,
775 but I know that SR10.2 supports it. */
776
777 extern void proc1_$get_loadav ();
778 unsigned long load_ave[3];
779
780 proc1_$get_loadav (load_ave);
781
782 if (nelem > 0)
783 loadavg[elem++] = load_ave[0] / 65536.0;
784 if (nelem > 1)
785 loadavg[elem++] = load_ave[1] / 65536.0;
786 if (nelem > 2)
787 loadavg[elem++] = load_ave[2] / 65536.0;
788# endif /* apollo */
789
790# if !defined (LDAV_DONE) && defined (OSF_MIPS)
791# define LDAV_DONE
792
793 struct tbl_loadavg load_ave;
794 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
795 loadavg[elem++]
796 = (load_ave.tl_lscale == 0
797 ? load_ave.tl_avenrun.d[0]
798 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
799# endif /* OSF_MIPS */
800
801# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
802# define LDAV_DONE
803
804 /* A faithful emulation is going to have to be saved for a rainy day. */
805 for ( ; elem < nelem; elem++)
806 {
807 loadavg[elem] = 0.0;
808 }
809# endif /* __MSDOS__ || WINDOWS32 */
810
811# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
812# define LDAV_DONE
813
814 struct tbl_loadavg load_ave;
815 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
816 for (elem = 0; elem < nelem; elem++)
817 loadavg[elem]
818 = (load_ave.tl_lscale == 0
819 ? load_ave.tl_avenrun.d[elem]
820 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
821# endif /* OSF_ALPHA */
822
823# if !defined (LDAV_DONE) && defined (VMS)
824 /* VMS specific code -- read from the Load Ave driver. */
825
826 LOAD_AVE_TYPE load_ave[3];
827 static int getloadavg_initialized = 0;
828# ifdef eunice
829 struct
830 {
831 int dsc$w_length;
832 char *dsc$a_pointer;
833 } descriptor;
834# endif
835
836 /* Ensure that there is a channel open to the load ave device. */
837 if (!getloadavg_initialized)
838 {
839 /* Attempt to open the channel. */
840# ifdef eunice
841 descriptor.dsc$w_length = 18;
842 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
843# else
844 $DESCRIPTOR (descriptor, "LAV0:");
845# endif
846 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
847 getloadavg_initialized = 1;
848 }
849
850 /* Read the load average vector. */
851 if (getloadavg_initialized
852 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
853 load_ave, 12, 0, 0, 0, 0) & 1))
854 {
855 sys$dassgn (channel);
856 getloadavg_initialized = 0;
857 }
858
859 if (!getloadavg_initialized)
860 return -1;
861# endif /* VMS */
862
863# if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
864
865 /* UNIX-specific code -- read the average from /dev/kmem. */
866
867# define LDAV_PRIVILEGED /* This code requires special installation. */
868
869 LOAD_AVE_TYPE load_ave[3];
870
871 /* Get the address of LDAV_SYMBOL. */
872 if (offset == 0)
873 {
874# ifndef sgi
875# ifndef NLIST_STRUCT
876 strcpy (nl[0].n_name, LDAV_SYMBOL);
877 strcpy (nl[1].n_name, "");
878# else /* NLIST_STRUCT */
879# ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
880 nl[0].n_un.n_name = LDAV_SYMBOL;
881 nl[1].n_un.n_name = 0;
882# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
883 nl[0].n_name = LDAV_SYMBOL;
884 nl[1].n_name = 0;
885# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
886# endif /* NLIST_STRUCT */
887
888# ifndef SUNOS_5
889 if (
890# if !(defined (_AIX) && !defined (ps2))
891 nlist (KERNEL_FILE, nl)
892# else /* _AIX */
893 knlist (nl, 1, sizeof (nl[0]))
894# endif
895 >= 0)
896 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
897 {
898# ifdef FIXUP_KERNEL_SYMBOL_ADDR
899 FIXUP_KERNEL_SYMBOL_ADDR (nl);
900# endif
901 offset = nl[0].n_value;
902 }
903# endif /* !SUNOS_5 */
904# else /* sgi */
905 int ldav_off;
906
907 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
908 if (ldav_off != -1)
909 offset = (long) ldav_off & 0x7fffffff;
910# endif /* sgi */
911 }
912
913 /* Make sure we have /dev/kmem open. */
914 if (!getloadavg_initialized)
915 {
916# ifndef SUNOS_5
917 channel = open ("/dev/kmem", 0);
918 if (channel >= 0)
919 {
920 /* Set the channel to close on exec, so it does not
921 litter any child's descriptor table. */
922# ifdef F_SETFD
923# ifndef FD_CLOEXEC
924# define FD_CLOEXEC 1
925# endif
926 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
927# endif
928 getloadavg_initialized = 1;
929 }
930# else /* SUNOS_5 */
931 /* We pass 0 for the kernel, corefile, and swapfile names
932 to use the currently running kernel. */
933 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
934 if (kd != 0)
935 {
936 /* nlist the currently running kernel. */
937 kvm_nlist (kd, nl);
938 offset = nl[0].n_value;
939 getloadavg_initialized = 1;
940 }
941# endif /* SUNOS_5 */
942 }
943
944 /* If we can, get the load average values. */
945 if (offset && getloadavg_initialized)
946 {
947 /* Try to read the load. */
948# ifndef SUNOS_5
949 if (lseek (channel, offset, 0) == -1L
950 || read (channel, (char *) load_ave, sizeof (load_ave))
951 != sizeof (load_ave))
952 {
953 close (channel);
954 getloadavg_initialized = 0;
955 }
956# else /* SUNOS_5 */
957 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
958 != sizeof (load_ave))
959 {
960 kvm_close (kd);
961 getloadavg_initialized = 0;
962 }
963# endif /* SUNOS_5 */
964 }
965
966 if (offset == 0 || !getloadavg_initialized)
967 return -1;
968# endif /* LOAD_AVE_TYPE and not VMS */
969
970# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
971 if (nelem > 0)
972 loadavg[elem++] = LDAV_CVT (load_ave[0]);
973 if (nelem > 1)
974 loadavg[elem++] = LDAV_CVT (load_ave[1]);
975 if (nelem > 2)
976 loadavg[elem++] = LDAV_CVT (load_ave[2]);
977
978# define LDAV_DONE
979# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
980
981# ifdef LDAV_DONE
982 return elem;
983# else
984 /* Set errno to zero to indicate that there was no particular error;
985 this function just can't work at all on this system. */
986 errno = 0;
987 return -1;
988# endif
989}
990
991#endif /* ! HAVE_GETLOADAVG */
992
993
994#ifdef TEST
995#include "make.h"
996
997int
998main (int argc, char **argv)
999{
1000 int naptime = 0;
1001
1002 if (argc > 1)
1003 naptime = atoi (argv[1]);
1004
1005 while (1)
1006 {
1007 double avg[3];
1008 int loads;
1009
1010 errno = 0; /* Don't be misled if it doesn't set errno. */
1011 loads = getloadavg (avg, 3);
1012 if (loads == -1)
1013 {
1014 perror ("Error getting load average");
1015 exit (1);
1016 }
1017 if (loads > 0)
1018 printf ("1-minute: %f ", avg[0]);
1019 if (loads > 1)
1020 printf ("5-minute: %f ", avg[1]);
1021 if (loads > 2)
1022 printf ("15-minute: %f ", avg[2]);
1023 if (loads > 0)
1024 putchar ('\n');
1025
1026 if (naptime == 0)
1027 break;
1028 sleep (naptime);
1029 }
1030
1031 exit (0);
1032}
1033#endif /* TEST */
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