source: trunk/src/kmk/getloadavg.c@ 3679

Last change on this file since 3679 was 3140, checked in by bird, 8 years ago

kmk: Merged in changes from GNU make 4.2.1 (2e55f5e4abdc0e38c1d64be703b446695e70b3b6 / ​https://git.savannah.gnu.org/git/make.git).
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1/* Get the system load averages.
2Copyright (C) 1985-2016 Free Software Foundation, Inc.
3
4GNU Make is free software; you can redistribute it and/or modify it under the
5terms of the GNU General Public License as published by the Free Software
6Foundation; either version 3 of the License, or (at your option) any later
7version.
8
9GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
10WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12
13You should have received a copy of the GNU General Public License along with
14this program. If not, see <http://www.gnu.org/licenses/>. */
15
16/* Compile-time symbols that this file uses:
17
18 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
19 pstat_getdynamic function. I think it
20 is unique to HPUX9. The best way to get the
21 definition is through the AC_FUNC_GETLOADAVG
22 macro that comes with autoconf 2.13 or newer.
23 If that isn't an option, then just put
24 AC_CHECK_FUNCS(pstat_getdynamic) in your
25 configure.in file.
26 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
27 KERNEL_FILE Pathname of the kernel to nlist.
28 LDAV_CVT() Scale the load average from the kernel.
29 Returns a double.
30 LDAV_SYMBOL Name of kernel symbol giving load average.
31 LOAD_AVE_TYPE Type of the load average array in the kernel.
32 Must be defined unless one of
33 apollo, DGUX, NeXT, or UMAX is defined;
34 or we have libkstat;
35 otherwise, no load average is available.
36 NLIST_STRUCT Include nlist.h, not a.out.h, and
37 the nlist n_name element is a pointer,
38 not an array.
39 HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
40 LINUX_LDAV_FILE [__linux__]: File containing load averages.
41
42 Specific system predefines this file uses, aside from setting
43 default values if not emacs:
44
45 apollo
46 BSD Real BSD, not just BSD-like.
47 convex
48 DGUX
49 eunice UNIX emulator under VMS.
50 hpux
51 __MSDOS__ No-op for MSDOS.
52 NeXT
53 sgi
54 sequent Sequent Dynix 3.x.x (BSD)
55 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
56 sony_news NEWS-OS (works at least for 4.1C)
57 UMAX
58 UMAX4_3
59 VMS
60 WINDOWS32 No-op for Windows95/NT.
61 __linux__ Linux: assumes /proc filesystem mounted.
62 Support from Michael K. Johnson.
63 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
64
65 In addition, to avoid nesting many #ifdefs, we internally set
66 LDAV_DONE to indicate that the load average has been computed.
67
68 We also #define LDAV_PRIVILEGED if a program will require
69 special installation to be able to call getloadavg. */
70
71/* This should always be first. */
72#ifdef HAVE_CONFIG_H
73# include <config.h>
74#endif
75
76#include <sys/types.h>
77
78/* Both the Emacs and non-Emacs sections want this. Some
79 configuration files' definitions for the LOAD_AVE_CVT macro (like
80 sparc.h's) use macros like FSCALE, defined here. */
81#if defined (unix) || defined (__unix)
82# include <sys/param.h>
83#endif
84
85
86/* Exclude all the code except the test program at the end
87 if the system has its own 'getloadavg' function.
88
89 The declaration of 'errno' is needed by the test program
90 as well as the function itself, so it comes first. */
91
92#include <errno.h>
93
94#ifndef errno
95extern int errno;
96#endif
97
98#if HAVE_LOCALE_H
99# include <locale.h>
100#endif
101#if !HAVE_SETLOCALE
102# define setlocale(Category, Locale) /* empty */
103#endif
104
105#ifndef HAVE_GETLOADAVG
106
107
108/* The existing Emacs configuration files define a macro called
109 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
110 returns the load average multiplied by 100. What we actually want
111 is a macro called LDAV_CVT, which returns the load average as an
112 unmultiplied double.
113
114 For backwards compatibility, we'll define LDAV_CVT in terms of
115 LOAD_AVE_CVT, but future machine config files should just define
116 LDAV_CVT directly. */
117
118# if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
119# define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
120# endif
121
122# if !defined (BSD) && defined (ultrix)
123/* Ultrix behaves like BSD on Vaxen. */
124# define BSD
125# endif
126
127# ifdef NeXT
128/* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
129 conflicts with the definition understood in this file, that this
130 really is BSD. */
131# undef BSD
132
133/* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
134 defined to mean that the nlist method should be used, which is not true. */
135# undef FSCALE
136# endif
137
138/* Same issues as for NeXT apply to the HURD-based GNU system. */
139# ifdef __GNU__
140# undef BSD
141# undef FSCALE
142# endif /* __GNU__ */
143
144/* Set values that are different from the defaults, which are
145 set a little farther down with #ifndef. */
146
147
148/* Some shorthands. */
149
150# if defined (HPUX) && !defined (hpux)
151# define hpux
152# endif
153
154# if defined (__hpux) && !defined (hpux)
155# define hpux
156# endif
157
158# if defined (__sun) && !defined (sun)
159# define sun
160# endif
161
162# if defined(hp300) && !defined(hpux)
163# define MORE_BSD
164# endif
165
166# if defined(ultrix) && defined(mips)
167# define decstation
168# endif
169
170# if defined (__SVR4) && !defined (SVR4)
171# define SVR4
172# endif
173
174# if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
175# define SUNOS_5
176# endif
177
178# if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
179# define OSF_ALPHA
180# include <sys/mbuf.h>
181# include <sys/socket.h>
182# include <net/route.h>
183# include <sys/table.h>
184# endif
185
186# if defined (__osf__) && (defined (mips) || defined (__mips__))
187# define OSF_MIPS
188# include <sys/table.h>
189# endif
190
191/* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
192 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
193 that with a couple of other things and we'll have a unique match. */
194# if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
195# define tek4300 /* Define by emacs, but not by other users. */
196# endif
197
198/* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
199# if defined(__QNX__)
200# undef SVR4
201# endif
202
203/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
204# ifndef LOAD_AVE_TYPE
205
206# ifdef MORE_BSD
207# define LOAD_AVE_TYPE long
208# endif
209
210# ifdef sun
211# define LOAD_AVE_TYPE long
212# endif
213
214# ifdef decstation
215# define LOAD_AVE_TYPE long
216# endif
217
218# ifdef _SEQUENT_
219# define LOAD_AVE_TYPE long
220# endif
221
222# ifdef sgi
223# define LOAD_AVE_TYPE long
224# endif
225
226# ifdef SVR4
227# define LOAD_AVE_TYPE long
228# endif
229
230# ifdef sony_news
231# define LOAD_AVE_TYPE long
232# endif
233
234# ifdef sequent
235# define LOAD_AVE_TYPE long
236# endif
237
238# ifdef OSF_ALPHA
239# define LOAD_AVE_TYPE long
240# endif
241
242# if defined (ardent) && defined (titan)
243# define LOAD_AVE_TYPE long
244# endif
245
246# ifdef tek4300
247# define LOAD_AVE_TYPE long
248# endif
249
250# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
251# define LOAD_AVE_TYPE long
252# endif
253
254# ifdef _AIX
255# define LOAD_AVE_TYPE long
256# endif
257
258# ifdef convex
259# define LOAD_AVE_TYPE double
260# ifndef LDAV_CVT
261# define LDAV_CVT(n) (n)
262# endif
263# endif
264
265# endif /* No LOAD_AVE_TYPE. */
266
267# ifdef OSF_ALPHA
268/* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
269 according to ghazi@noc.rutgers.edu. */
270# undef FSCALE
271# define FSCALE 1024.0
272# endif
273
274# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
275/* <sys/param.h> defines an incorrect value for FSCALE on an
276 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
277# undef FSCALE
278# define FSCALE 100.0
279# endif
280
281
282# ifndef FSCALE
283
284/* SunOS and some others define FSCALE in sys/param.h. */
285
286# ifdef MORE_BSD
287# define FSCALE 2048.0
288# endif
289
290# if defined(MIPS) || defined(SVR4) || defined(decstation)
291# define FSCALE 256
292# endif
293
294# if defined (sgi) || defined (sequent)
295/* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
296 above under #ifdef MIPS. But we want the sgi value. */
297# undef FSCALE
298# define FSCALE 1000.0
299# endif
300
301# if defined (ardent) && defined (titan)
302# define FSCALE 65536.0
303# endif
304
305# ifdef tek4300
306# define FSCALE 100.0
307# endif
308
309# ifdef _AIX
310# define FSCALE 65536.0
311# endif
312
313# endif /* Not FSCALE. */
314
315# if !defined (LDAV_CVT) && defined (FSCALE)
316# define LDAV_CVT(n) (((double) (n)) / FSCALE)
317# endif
318
319
320# if defined(sgi) || (defined(mips) && !defined(BSD))
321# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
322# endif
323
324
325# if !defined (KERNEL_FILE) && defined (sequent)
326# define KERNEL_FILE "/dynix"
327# endif
328
329# if !defined (KERNEL_FILE) && defined (hpux)
330# define KERNEL_FILE "/hp-ux"
331# endif
332
333# if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
334# define KERNEL_FILE "/unix"
335# endif
336
337
338# if !defined (LDAV_SYMBOL) && defined (alliant)
339# define LDAV_SYMBOL "_Loadavg"
340# endif
341
342# if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
343# define LDAV_SYMBOL "avenrun"
344# endif
345
346# ifdef HAVE_UNISTD_H
347# include <unistd.h>
348# endif
349
350# include <stdio.h>
351
352/* LOAD_AVE_TYPE should only get defined if we're going to use the
353 nlist method. */
354# if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) && !defined(__riscos__)
355# define LOAD_AVE_TYPE double
356# endif
357
358# ifdef LOAD_AVE_TYPE
359
360# ifndef VMS
361# ifndef __linux__
362# ifdef HAVE_NLIST_H
363# include <nlist.h>
364# else
365# include <a.out.h>
366# endif
367
368# ifdef SUNOS_5
369# include <fcntl.h>
370# include <kvm.h>
371# include <kstat.h>
372# endif
373
374# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
375# include <sys/pstat.h>
376# endif
377
378# ifndef KERNEL_FILE
379# define KERNEL_FILE "/vmunix"
380# endif /* KERNEL_FILE */
381
382# ifndef LDAV_SYMBOL
383# define LDAV_SYMBOL "_avenrun"
384# endif /* LDAV_SYMBOL */
385# endif /* __linux__ */
386
387# else /* VMS */
388
389# ifndef eunice
390# include <iodef.h>
391# include <descrip.h>
392# else /* eunice */
393# include <vms/iodef.h>
394# endif /* eunice */
395# endif /* VMS */
396
397# ifndef LDAV_CVT
398# define LDAV_CVT(n) ((double) (n))
399# endif /* !LDAV_CVT */
400
401# endif /* LOAD_AVE_TYPE */
402
403# if defined(__GNU__) && !defined (NeXT)
404/* Note that NeXT Openstep defines __GNU__ even though it should not. */
405/* GNU system acts much like NeXT, for load average purposes,
406 but not exactly. */
407# define NeXT
408# define host_self mach_host_self
409# endif
410
411# ifdef NeXT
412# ifdef HAVE_MACH_MACH_H
413# include <mach/mach.h>
414# else
415# include <mach.h>
416# endif
417# endif /* NeXT */
418
419# ifdef sgi
420# include <sys/sysmp.h>
421# endif /* sgi */
422
423# ifdef UMAX
424# include <stdio.h>
425# include <signal.h>
426# include <sys/time.h>
427# include <sys/wait.h>
428# include <sys/syscall.h>
429
430# ifdef UMAX_43
431# include <machine/cpu.h>
432# include <inq_stats/statistics.h>
433# include <inq_stats/sysstats.h>
434# include <inq_stats/cpustats.h>
435# include <inq_stats/procstats.h>
436# else /* Not UMAX_43. */
437# include <sys/sysdefs.h>
438# include <sys/statistics.h>
439# include <sys/sysstats.h>
440# include <sys/cpudefs.h>
441# include <sys/cpustats.h>
442# include <sys/procstats.h>
443# endif /* Not UMAX_43. */
444# endif /* UMAX */
445
446# ifdef DGUX
447# include <sys/dg_sys_info.h>
448# endif
449
450# if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
451# include <fcntl.h>
452# else
453# include <sys/file.h>
454# endif
455
456
457
458/* Avoid static vars inside a function since in HPUX they dump as pure. */
459
460# ifdef NeXT
461static processor_set_t default_set;
462static int getloadavg_initialized;
463# endif /* NeXT */
464
465# ifdef UMAX
466static unsigned int cpus = 0;
467static unsigned int samples;
468# endif /* UMAX */
469
470# ifdef DGUX
471static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
472# endif /* DGUX */
473
474#if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
475/* File descriptor open to /dev/kmem or VMS load ave driver. */
476static int channel;
477/* Nonzero iff channel is valid. */
478static int getloadavg_initialized;
479/* Offset in kmem to seek to read load average, or 0 means invalid. */
480static long offset;
481
482#if !defined(VMS) && !defined(sgi) && !defined(__linux__)
483static struct nlist nl[2];
484#endif /* Not VMS or sgi */
485
486#ifdef SUNOS_5
487static kvm_t *kd;
488#endif /* SUNOS_5 */
489
490#endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
491
492
493/* Put the 1 minute, 5 minute and 15 minute load averages
494 into the first NELEM elements of LOADAVG.
495 Return the number written (never more than 3, but may be less than NELEM),
496 or -1 if an error occurred. */
497
498int
499getloadavg (double loadavg[], int nelem)
500{
501 int elem = 0; /* Return value. */
502
503# ifdef NO_GET_LOAD_AVG
504# define LDAV_DONE
505 /* Set errno to zero to indicate that there was no particular error;
506 this function just can't work at all on this system. */
507 errno = 0;
508 elem = -1;
509# endif
510
511# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
512/* Use libkstat because we don't have to be root. */
513# define LDAV_DONE
514 kstat_ctl_t *kc;
515 kstat_t *ksp;
516 kstat_named_t *kn;
517
518 kc = kstat_open ();
519 if (kc == 0)
520 return -1;
521 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
522 if (ksp == 0 )
523 return -1;
524 if (kstat_read (kc, ksp, 0) == -1)
525 return -1;
526
527
528 kn = kstat_data_lookup (ksp, "avenrun_1min");
529 if (kn == 0)
530 {
531 /* Return -1 if no load average information is available. */
532 nelem = 0;
533 elem = -1;
534 }
535
536 if (nelem >= 1)
537 loadavg[elem++] = (double) kn->value.ul/FSCALE;
538
539 if (nelem >= 2)
540 {
541 kn = kstat_data_lookup (ksp, "avenrun_5min");
542 if (kn != 0)
543 {
544 loadavg[elem++] = (double) kn->value.ul/FSCALE;
545
546 if (nelem >= 3)
547 {
548 kn = kstat_data_lookup (ksp, "avenrun_15min");
549 if (kn != 0)
550 loadavg[elem++] = (double) kn->value.ul/FSCALE;
551 }
552 }
553 }
554
555 kstat_close (kc);
556# endif /* HAVE_LIBKSTAT */
557
558# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
559/* Use pstat_getdynamic() because we don't have to be root. */
560# define LDAV_DONE
561# undef LOAD_AVE_TYPE
562
563 struct pst_dynamic dyn_info;
564 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
565 return -1;
566 if (nelem > 0)
567 loadavg[elem++] = dyn_info.psd_avg_1_min;
568 if (nelem > 1)
569 loadavg[elem++] = dyn_info.psd_avg_5_min;
570 if (nelem > 2)
571 loadavg[elem++] = dyn_info.psd_avg_15_min;
572
573# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
574
575# if !defined (LDAV_DONE) && defined (__linux__)
576# define LDAV_DONE
577# undef LOAD_AVE_TYPE
578
579# ifndef LINUX_LDAV_FILE
580# define LINUX_LDAV_FILE "/proc/loadavg"
581# endif
582
583 char ldavgbuf[40];
584 double load_ave[3];
585 int fd, count;
586
587 fd = open (LINUX_LDAV_FILE, O_RDONLY);
588 if (fd == -1)
589 return -1;
590 count = read (fd, ldavgbuf, 40);
591 (void) close (fd);
592 if (count <= 0)
593 return -1;
594
595 /* The following sscanf must use the C locale. */
596 setlocale (LC_NUMERIC, "C");
597 count = sscanf (ldavgbuf, "%lf %lf %lf",
598 &load_ave[0], &load_ave[1], &load_ave[2]);
599 setlocale (LC_NUMERIC, "");
600 if (count < 1)
601 return -1;
602
603 for (elem = 0; elem < nelem && elem < count; elem++)
604 loadavg[elem] = load_ave[elem];
605
606 return elem;
607
608# endif /* __linux__ */
609
610# if !defined (LDAV_DONE) && defined (__NetBSD__)
611# define LDAV_DONE
612# undef LOAD_AVE_TYPE
613
614# ifndef NETBSD_LDAV_FILE
615# define NETBSD_LDAV_FILE "/kern/loadavg"
616# endif
617
618 unsigned long int load_ave[3], scale;
619 int count;
620 FILE *fp;
621
622 fp = fopen (NETBSD_LDAV_FILE, "r");
623 if (fp == NULL)
624 return -1;
625 count = fscanf (fp, "%lu %lu %lu %lu\n",
626 &load_ave[0], &load_ave[1], &load_ave[2],
627 &scale);
628 (void) fclose (fp);
629 if (count != 4)
630 return -1;
631
632 for (elem = 0; elem < nelem; elem++)
633 loadavg[elem] = (double) load_ave[elem] / (double) scale;
634
635 return elem;
636
637# endif /* __NetBSD__ */
638
639# if !defined (LDAV_DONE) && defined (NeXT)
640# define LDAV_DONE
641 /* The NeXT code was adapted from iscreen 3.2. */
642
643 host_t host;
644 struct processor_set_basic_info info;
645 unsigned info_count;
646
647 /* We only know how to get the 1-minute average for this system,
648 so even if the caller asks for more than 1, we only return 1. */
649
650 if (!getloadavg_initialized)
651 {
652 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
653 getloadavg_initialized = 1;
654 }
655
656 if (getloadavg_initialized)
657 {
658 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
659 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
660 (processor_set_info_t) &info, &info_count)
661 != KERN_SUCCESS)
662 getloadavg_initialized = 0;
663 else
664 {
665 if (nelem > 0)
666 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
667 }
668 }
669
670 if (!getloadavg_initialized)
671 return -1;
672# endif /* NeXT */
673
674# if !defined (LDAV_DONE) && defined (UMAX)
675# define LDAV_DONE
676/* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
677 have a /dev/kmem. Information about the workings of the running kernel
678 can be gathered with inq_stats system calls.
679 We only know how to get the 1-minute average for this system. */
680
681 struct proc_summary proc_sum_data;
682 struct stat_descr proc_info;
683 double load;
684 register unsigned int i, j;
685
686 if (cpus == 0)
687 {
688 register unsigned int c, i;
689 struct cpu_config conf;
690 struct stat_descr desc;
691
692 desc.sd_next = 0;
693 desc.sd_subsys = SUBSYS_CPU;
694 desc.sd_type = CPUTYPE_CONFIG;
695 desc.sd_addr = (char *) &conf;
696 desc.sd_size = sizeof conf;
697
698 if (inq_stats (1, &desc))
699 return -1;
700
701 c = 0;
702 for (i = 0; i < conf.config_maxclass; ++i)
703 {
704 struct class_stats stats;
705 memset (&stats, '\0', sizeof stats);
706
707 desc.sd_type = CPUTYPE_CLASS;
708 desc.sd_objid = i;
709 desc.sd_addr = (char *) &stats;
710 desc.sd_size = sizeof stats;
711
712 if (inq_stats (1, &desc))
713 return -1;
714
715 c += stats.class_numcpus;
716 }
717 cpus = c;
718 samples = cpus < 2 ? 3 : (2 * cpus / 3);
719 }
720
721 proc_info.sd_next = 0;
722 proc_info.sd_subsys = SUBSYS_PROC;
723 proc_info.sd_type = PROCTYPE_SUMMARY;
724 proc_info.sd_addr = (char *) &proc_sum_data;
725 proc_info.sd_size = sizeof (struct proc_summary);
726 proc_info.sd_sizeused = 0;
727
728 if (inq_stats (1, &proc_info) != 0)
729 return -1;
730
731 load = proc_sum_data.ps_nrunnable;
732 j = 0;
733 for (i = samples - 1; i > 0; --i)
734 {
735 load += proc_sum_data.ps_nrun[j];
736 if (j++ == PS_NRUNSIZE)
737 j = 0;
738 }
739
740 if (nelem > 0)
741 loadavg[elem++] = load / samples / cpus;
742# endif /* UMAX */
743
744# if !defined (LDAV_DONE) && defined (DGUX)
745# define LDAV_DONE
746 /* This call can return -1 for an error, but with good args
747 it's not supposed to fail. The first argument is for no
748 apparent reason of type 'long int *'. */
749 dg_sys_info ((long int *) &load_info,
750 DG_SYS_INFO_LOAD_INFO_TYPE,
751 DG_SYS_INFO_LOAD_VERSION_0);
752
753 if (nelem > 0)
754 loadavg[elem++] = load_info.one_minute;
755 if (nelem > 1)
756 loadavg[elem++] = load_info.five_minute;
757 if (nelem > 2)
758 loadavg[elem++] = load_info.fifteen_minute;
759# endif /* DGUX */
760
761# if !defined (LDAV_DONE) && defined (apollo)
762# define LDAV_DONE
763/* Apollo code from lisch@mentorg.com (Ray Lischner).
764
765 This system call is not documented. The load average is obtained as
766 three long integers, for the load average over the past minute,
767 five minutes, and fifteen minutes. Each value is a scaled integer,
768 with 16 bits of integer part and 16 bits of fraction part.
769
770 I'm not sure which operating system first supported this system call,
771 but I know that SR10.2 supports it. */
772
773 extern void proc1_$get_loadav ();
774 unsigned long load_ave[3];
775
776 proc1_$get_loadav (load_ave);
777
778 if (nelem > 0)
779 loadavg[elem++] = load_ave[0] / 65536.0;
780 if (nelem > 1)
781 loadavg[elem++] = load_ave[1] / 65536.0;
782 if (nelem > 2)
783 loadavg[elem++] = load_ave[2] / 65536.0;
784# endif /* apollo */
785
786# if !defined (LDAV_DONE) && defined (OSF_MIPS)
787# define LDAV_DONE
788
789 struct tbl_loadavg load_ave;
790 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
791 loadavg[elem++]
792 = (load_ave.tl_lscale == 0
793 ? load_ave.tl_avenrun.d[0]
794 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
795# endif /* OSF_MIPS */
796
797# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
798# define LDAV_DONE
799
800 /* A faithful emulation is going to have to be saved for a rainy day. */
801 for ( ; elem < nelem; elem++)
802 {
803 loadavg[elem] = 0.0;
804 }
805# endif /* __MSDOS__ || WINDOWS32 */
806
807# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
808# define LDAV_DONE
809
810 struct tbl_loadavg load_ave;
811 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
812 for (elem = 0; elem < nelem; elem++)
813 loadavg[elem]
814 = (load_ave.tl_lscale == 0
815 ? load_ave.tl_avenrun.d[elem]
816 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
817# endif /* OSF_ALPHA */
818
819# if !defined (LDAV_DONE) && defined (VMS)
820 /* VMS specific code -- read from the Load Ave driver. */
821
822 LOAD_AVE_TYPE load_ave[3];
823 static int getloadavg_initialized = 0;
824# ifdef eunice
825 struct
826 {
827 int dsc$w_length;
828 char *dsc$a_pointer;
829 } descriptor;
830# endif
831
832 /* Ensure that there is a channel open to the load ave device. */
833 if (!getloadavg_initialized)
834 {
835 /* Attempt to open the channel. */
836# ifdef eunice
837 descriptor.dsc$w_length = 18;
838 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
839# else
840 $DESCRIPTOR (descriptor, "LAV0:");
841# endif
842 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
843 getloadavg_initialized = 1;
844 }
845
846 /* Read the load average vector. */
847 if (getloadavg_initialized
848 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
849 load_ave, 12, 0, 0, 0, 0) & 1))
850 {
851 sys$dassgn (channel);
852 getloadavg_initialized = 0;
853 }
854
855 if (!getloadavg_initialized)
856 return -1;
857# endif /* VMS */
858
859# if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
860
861 /* UNIX-specific code -- read the average from /dev/kmem. */
862
863# define LDAV_PRIVILEGED /* This code requires special installation. */
864
865 LOAD_AVE_TYPE load_ave[3];
866
867 /* Get the address of LDAV_SYMBOL. */
868 if (offset == 0)
869 {
870# ifndef sgi
871# ifndef NLIST_STRUCT
872 strcpy (nl[0].n_name, LDAV_SYMBOL);
873 strcpy (nl[1].n_name, "");
874# else /* NLIST_STRUCT */
875# ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
876 nl[0].n_un.n_name = LDAV_SYMBOL;
877 nl[1].n_un.n_name = 0;
878# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
879 nl[0].n_name = LDAV_SYMBOL;
880 nl[1].n_name = 0;
881# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
882# endif /* NLIST_STRUCT */
883
884# ifndef SUNOS_5
885 if (
886# if !(defined (_AIX) && !defined (ps2))
887 nlist (KERNEL_FILE, nl)
888# else /* _AIX */
889 knlist (nl, 1, sizeof (nl[0]))
890# endif
891 >= 0)
892 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
893 {
894# ifdef FIXUP_KERNEL_SYMBOL_ADDR
895 FIXUP_KERNEL_SYMBOL_ADDR (nl);
896# endif
897 offset = nl[0].n_value;
898 }
899# endif /* !SUNOS_5 */
900# else /* sgi */
901 int ldav_off;
902
903 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
904 if (ldav_off != -1)
905 offset = (long) ldav_off & 0x7fffffff;
906# endif /* sgi */
907 }
908
909 /* Make sure we have /dev/kmem open. */
910 if (!getloadavg_initialized)
911 {
912# ifndef SUNOS_5
913 channel = open ("/dev/kmem", 0);
914 if (channel >= 0)
915 {
916 /* Set the channel to close on exec, so it does not
917 litter any child's descriptor table. */
918# ifdef F_SETFD
919# ifndef FD_CLOEXEC
920# define FD_CLOEXEC 1
921# endif
922 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
923# endif
924 getloadavg_initialized = 1;
925 }
926# else /* SUNOS_5 */
927 /* We pass 0 for the kernel, corefile, and swapfile names
928 to use the currently running kernel. */
929 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
930 if (kd != 0)
931 {
932 /* nlist the currently running kernel. */
933 kvm_nlist (kd, nl);
934 offset = nl[0].n_value;
935 getloadavg_initialized = 1;
936 }
937# endif /* SUNOS_5 */
938 }
939
940 /* If we can, get the load average values. */
941 if (offset && getloadavg_initialized)
942 {
943 /* Try to read the load. */
944# ifndef SUNOS_5
945 if (lseek (channel, offset, 0) == -1L
946 || read (channel, (char *) load_ave, sizeof (load_ave))
947 != sizeof (load_ave))
948 {
949 close (channel);
950 getloadavg_initialized = 0;
951 }
952# else /* SUNOS_5 */
953 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
954 != sizeof (load_ave))
955 {
956 kvm_close (kd);
957 getloadavg_initialized = 0;
958 }
959# endif /* SUNOS_5 */
960 }
961
962 if (offset == 0 || !getloadavg_initialized)
963 return -1;
964# endif /* LOAD_AVE_TYPE and not VMS */
965
966# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
967 if (nelem > 0)
968 loadavg[elem++] = LDAV_CVT (load_ave[0]);
969 if (nelem > 1)
970 loadavg[elem++] = LDAV_CVT (load_ave[1]);
971 if (nelem > 2)
972 loadavg[elem++] = LDAV_CVT (load_ave[2]);
973
974# define LDAV_DONE
975# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
976
977# ifdef LDAV_DONE
978 return elem;
979# else
980 /* Set errno to zero to indicate that there was no particular error;
981 this function just can't work at all on this system. */
982 errno = 0;
983 return -1;
984# endif
985}
986
987#endif /* ! HAVE_GETLOADAVG */
988
989
990#ifdef TEST
991#include "makeint.h"
992
993int
994main (int argc, char **argv)
995{
996 int naptime = 0;
997
998 if (argc > 1)
999 naptime = atoi (argv[1]);
1000
1001 while (1)
1002 {
1003 double avg[3];
1004 int loads;
1005
1006 errno = 0; /* Don't be misled if it doesn't set errno. */
1007 loads = getloadavg (avg, 3);
1008 if (loads == -1)
1009 {
1010 perror ("Error getting load average");
1011 exit (1);
1012 }
1013 if (loads > 0)
1014 printf ("1-minute: %f ", avg[0]);
1015 if (loads > 1)
1016 printf ("5-minute: %f ", avg[1]);
1017 if (loads > 2)
1018 printf ("15-minute: %f ", avg[2]);
1019 if (loads > 0)
1020 putchar ('\n');
1021
1022 if (naptime == 0)
1023 break;
1024 sleep (naptime);
1025 }
1026
1027 exit (0);
1028}
1029#endif /* TEST */
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