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[bpt/emacs.git] / src / getloadavg.c
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1e5ba5b5
RM		 1/* Get the system load averages.
2 Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93
3 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18
19/* Compile-time symbols that this file uses:
20
21 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
22 KERNEL_FILE Pathname of the kernel to nlist.
23 LDAV_CVT() Scale the load average from the kernel.
24 Returns a double.
25 LDAV_SYMBOL Name of kernel symbol giving load average.
26 LOAD_AVE_TYPE Type of the load average array in the kernel.
27 Must be defined unless one of
28 apollo, DGUX, NeXT, or UMAX is defined;
29 otherwise, no load average is available.
30 NLIST_STRUCT Include nlist.h, not a.out.h, and
31 the nlist n_name element is a pointer,
32 not an array.
33 NLIST_NAME_UNION struct nlist has an n_un member, not n_name.
34 LINUX_LDAV_FILE [LINUX]: Name of file containing load averages.
35
36 Specific system predefines this file uses, aside from setting
37 default values if not emacs:
38
39 apollo
40 BSD Real BSD, not just BSD-like.
41 DGUX
42 eunice UNIX emulator under VMS.
43 hpux
44 NeXT
45 sgi
46 sequent Sequent Dynix 3.x.x (BSD)
47 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
48 sony_news NEWS-OS (works at least for 4.1C)
49 UMAX
50 UMAX4_3
51 VMS
52 LINUX Linux: assumes /proc filesystem mounted.
53 Support from Michael K. Johnson.
54
55 In addition, to avoid nesting many #ifdefs, we internally set
56 LDAV_DONE to indicate that the load average has been computed.
57
58 We also #define LDAV_PRIVILEGED if a program will require
59 special installation to be able to call getloadavg. */
60
61#include <sys/types.h>
62
63/* Both the Emacs and non-Emacs sections want this. Some
64 configuration files' definitions for the LOAD_AVE_CVT macro (like
65 sparc.h's) use macros like FSCALE, defined here. */
66#ifdef unix
67#include <sys/param.h>
68#endif
69
70
71#ifdef HAVE_CONFIG_H
72#include "config.h"
73#endif
74
75/* The existing Emacs configuration files define a macro called
76 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
77 returns the load average multiplied by 100. What we actually want
78 is a macro called LDAV_CVT, which returns the load average as an
79 unmultiplied double.
80
81 For backwards compatibility, we'll define LDAV_CVT in terms of
82 LOAD_AVE_CVT, but future machine config files should just define
83 LDAV_CVT directly. */
84
85#if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
86#define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
87#endif
88
89#if !defined (BSD) && defined (ultrix)
90/* Ultrix behaves like BSD on Vaxen. */
91#define BSD
92#endif
93
94#ifdef NeXT
95/* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
96 conflicts with the definition understood in this file, that this
97 really is BSD. */
98#undef BSD
99
100/* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
101 defined to mean that the nlist method should be used, which is not true. */
102#undef FSCALE
103#endif
104
105/* Set values that are different from the defaults, which are
106 set a little farther down with #ifndef. */
107
108
109/* Some shorthands. */
110
111#if defined (HPUX) && !defined (hpux)
112#define hpux
113#endif
114
115#if defined(hp300) && !defined(hpux)
116#define MORE_BSD
117#endif
118
119#if defined(ultrix) && defined(mips)
120#define decstation
121#endif
122
123#if defined(sun) && defined(SVR4)
124#define SUNOS_5
125#endif
126
127#if defined (__osf__) && defined (__alpha__)
128#define OSF_ALPHA
129#endif
130
131#if defined (__osf__) && (defined (mips) || defined (__mips__))
132#define OSF_MIPS
133#include <sys/table.h>
134#endif
135
136/* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
137 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
138 that with a couple of other things and we'll have a unique match. */
139#if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
140#define tek4300 /* Define by emacs, but not by other users. */
141#endif
142
143
8eda6c51 144/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
5ac622b2
RM		 145#ifndef LOAD_AVE_TYPE
146
8eda6c51
JB		 147#ifdef MORE_BSD
148#define LOAD_AVE_TYPE long
149#endif
150
151#ifdef sun
152#define LOAD_AVE_TYPE long
153#endif
154
155#ifdef decstation
156#define LOAD_AVE_TYPE long
157#endif
158
159#ifdef _SEQUENT_
160#define LOAD_AVE_TYPE long
161#endif
162
163#ifdef sgi
164#define LOAD_AVE_TYPE long
165#endif
166
167#ifdef SVR4
168#define LOAD_AVE_TYPE long
169#endif
170
171#ifdef sony_news
172#define LOAD_AVE_TYPE long
173#endif
174
175#ifdef sequent
176#define LOAD_AVE_TYPE long
177#endif
178
179#ifdef OSF_ALPHA
180#define LOAD_AVE_TYPE long
181#endif
182
5ac622b2 183#if defined (ardent) && defined (titan)
8eda6c51
JB		 184#define LOAD_AVE_TYPE long
185#endif
186
5ac622b2 187#ifdef tek4300
1e5ba5b5
RM		 188#define LOAD_AVE_TYPE long
189#endif
190
5ac622b2 191#endif /* No LOAD_AVE_TYPE. */
1e5ba5b5
RM		 192
193#ifndef FSCALE
194
195/* SunOS and some others define FSCALE in sys/param.h. */
196
197#ifdef MORE_BSD
198#define FSCALE 2048.0
199#endif
200
201#if defined(MIPS) || defined(SVR4) || defined(decstation)
202#define FSCALE 256
203#endif
204
205#if defined (sgi) || defined (sequent)
206#define FSCALE 1000.0
207#endif
208
209#if defined (ardent) && defined (titan)
210#define FSCALE 65536.0
211#endif
212
213#ifdef tek4300
214#define FSCALE 100.0
215#endif
216
217#endif /* Not FSCALE. */
218
219#if !defined (LDAV_CVT) && defined (FSCALE)
220#define LDAV_CVT(n) (((double) (n)) / FSCALE)
221#endif
222
8eda6c51
JB		 223/* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
224#ifndef NLIST_STRUCT
225
226#ifdef MORE_BSD
227#define NLIST_STRUCT
228#endif
229
230#ifdef sun
231#define NLIST_STRUCT
232#endif
233
234#ifdef decstation
235#define NLIST_STRUCT
236#endif
237
238#ifdef hpux
239#define NLIST_STRUCT
240#endif
241
242#if defined (_SEQUENT_) || defined (sequent)
243#define NLIST_STRUCT
244#endif
245
246#ifdef sgi
247#define NLIST_STRUCT
248#endif
249
250#ifdef SVR4
1e5ba5b5
RM		 251#define NLIST_STRUCT
252#endif
253
8eda6c51
JB		 254#ifdef sony_news
255#define NLIST_STRUCT
256#endif
257
258#ifdef OSF_ALPHA
259#define NLIST_STRUCT
260#endif
261
262#if defined (ardent) && defined (titan)
263#define NLIST_STRUCT
264#endif
265
266#ifdef tex4300
267#define NLIST_STRUCT
268#endif
269
270#ifdef butterfly
271#define NLIST_STRUCT
272#endif
273
274#endif /* defined (NLIST_STRUCT) */
275
1e5ba5b5
RM		 276
277#if defined(sgi) || (defined(mips) && !defined(BSD))
278#define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
279#endif
280
281
282#if !defined (KERNEL_FILE) && defined (sequent)
283#define KERNEL_FILE "/dynix"
284#endif
285
286#if !defined (KERNEL_FILE) && defined (hpux)
287#define KERNEL_FILE "/hp-ux"
288#endif
289
290#if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
291#define KERNEL_FILE "/unix"
292#endif
293
294
295#if !defined (LDAV_SYMBOL) && defined (alliant)
296#define LDAV_SYMBOL "_Loadavg"
297#endif
298
299#if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)))
300#define LDAV_SYMBOL "avenrun"
301#endif
302
303#ifdef HAVE_UNISTD_H
304#include <unistd.h>
305#endif
306
307#include <stdio.h>
308#include <errno.h>
309
310#ifndef errno
311extern int errno;
312#endif
313
314/* LOAD_AVE_TYPE should only get defined if we're going to use the
315 nlist method. */
316#if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
317#define LOAD_AVE_TYPE double
318#endif
319
320#ifdef LOAD_AVE_TYPE
321
322#ifndef VMS
323#ifndef NLIST_STRUCT
324#include <a.out.h>
325#else /* NLIST_STRUCT */
326#include <nlist.h>
327#endif /* NLIST_STRUCT */
328
329#ifdef SUNOS_5
330#include <fcntl.h>
331#include <kvm.h>
332#endif
333
334#ifndef KERNEL_FILE
335#define KERNEL_FILE "/vmunix"
336#endif /* KERNEL_FILE */
337
338#ifndef LDAV_SYMBOL
339#define LDAV_SYMBOL "_avenrun"
340#endif /* LDAV_SYMBOL */
341
342#else /* VMS */
343
344#ifndef eunice
345#include <iodef.h>
346#include <descrip.h>
347#else /* eunice */
348#include <vms/iodef.h>
349#endif /* eunice */
350#endif /* VMS */
351
352#ifndef LDAV_CVT
353#define LDAV_CVT(n) ((double) (n))
354#endif /* !LDAV_CVT */
355
356#endif /* LOAD_AVE_TYPE */
357
358#ifdef NeXT
359#ifdef HAVE_MACH_MACH_H
360#include <mach/mach.h>
361#else
362#include <mach.h>
363#endif
364#endif /* NeXT */
365
366#ifdef sgi
367#include <sys/sysmp.h>
368#endif /* sgi */
369
370#ifdef UMAX
371#include <stdio.h>
372#include <signal.h>
373#include <sys/time.h>
374#include <sys/wait.h>
375#include <sys/syscall.h>
376
377#ifdef UMAX_43
378#include <machine/cpu.h>
379#include <inq_stats/statistics.h>
380#include <inq_stats/sysstats.h>
381#include <inq_stats/cpustats.h>
382#include <inq_stats/procstats.h>
383#else /* Not UMAX_43. */
384#include <sys/sysdefs.h>
385#include <sys/statistics.h>
386#include <sys/sysstats.h>
387#include <sys/cpudefs.h>
388#include <sys/cpustats.h>
389#include <sys/procstats.h>
390#endif /* Not UMAX_43. */
391#endif /* UMAX */
392
393#ifdef DGUX
394#include <sys/dg_sys_info.h>
395#endif
396
397#if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
398#include <fcntl.h>
399#else
400#include <sys/file.h>
401#endif
402\f
403/* Avoid static vars inside a function since in HPUX they dump as pure. */
404
405#ifdef NeXT
406static processor_set_t default_set;
407static int getloadavg_initialized;
408#endif /* NeXT */
409
410#ifdef UMAX
411static unsigned int cpus = 0;
412static unsigned int samples;
413#endif /* UMAX */
414
415#ifdef DGUX
416static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
417#endif /* DGUX */
418
419#ifdef LOAD_AVE_TYPE
420/* File descriptor open to /dev/kmem or VMS load ave driver. */
421static int channel;
422/* Nonzero iff channel is valid. */
423static int getloadavg_initialized;
424/* Offset in kmem to seek to read load average, or 0 means invalid. */
425static long offset;
426
427#if !defined(VMS) && !defined(sgi)
428static struct nlist nl[2];
429#endif /* Not VMS or sgi */
430
431#ifdef SUNOS_5
432static kvm_t *kd;
433#endif /* SUNOS_5 */
434
435#endif /* LOAD_AVE_TYPE */
436\f
437/* Put the 1 minute, 5 minute and 15 minute load averages
438 into the first NELEM elements of LOADAVG.
439 Return the number written (never more than 3),
440 or -1 if an error occurred. */
441
442int
443getloadavg (loadavg, nelem)
444 double loadavg[];
445 int nelem;
446{
447 int elem = 0; /* Return value. */
448
7ee260fe
RM		 449#ifdef NO_GET_LOAD_AVG
450#define LDAV_DONE
451 /* Set errno to zero to indicate that there was no particular error;
452 this function just can't work at all on this system. */
453 errno = 0;
454 elem = -1;
455#endif
456
1e5ba5b5
RM		 457#if !defined (LDAV_DONE) && defined (LINUX)
458#define LDAV_DONE
459#undef LOAD_AVE_TYPE
460
461#ifndef LINUX_LDAV_FILE
462#define LINUX_LDAV_FILE "/proc/loadavg"
463#endif
464
465 char ldavgbuf[40];
466 double load_ave[3];
467 int fd, count;
468
469 fd = open (LINUX_LDAV_FILE, O_RDONLY);
470 if (fd == -1)
471 return -1;
472 count = read (fd, ldavgbuf, 40);
473 (void) close (fd);
474 if (count <= 0)
475 return -1;
476
477 count = sscanf (ldavgbuf, "%lf %lf %lf",
478 &load_ave[0], &load_ave[1], &load_ave[2]);
479 if (count < 1)
480 return -1;
481
482 for (elem = 0; elem < nelem && elem < count; elem++)
483 loadavg[elem] = load_ave[elem];
484
485 return elem;
486
487#endif /* LINUX */
488
489#if !defined (LDAV_DONE) && defined (NeXT)
490#define LDAV_DONE
491 /* The NeXT code was adapted from iscreen 3.2. */
492
493 host_t host;
494 struct processor_set_basic_info info;
495 unsigned info_count;
496
497 if (nelem > 1)
498 {
499 /* We only know how to get the 1-minute average for this system. */
500 errno = EINVAL;
501 return -1;
502 }
503
504 if (!getloadavg_initialized)
505 {
506 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
507 getloadavg_initialized = 1;
508 }
509
510 if (getloadavg_initialized)
511 {
512 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
513 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
514 (processor_set_info_t) &info, &info_count)
515 != KERN_SUCCESS)
516 getloadavg_initialized = 0;
517 else
518 {
519 if (nelem > 0)
520 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
521 }
522 }
523
524 if (!getloadavg_initialized)
525 return -1;
526#endif /* NeXT */
527
528#if !defined (LDAV_DONE) && defined (UMAX)
529#define LDAV_DONE
530/* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
531 have a /dev/kmem. Information about the workings of the running kernel
532 can be gathered with inq_stats system calls.
533 We only know how to get the 1-minute average for this system. */
534
535 struct proc_summary proc_sum_data;
536 struct stat_descr proc_info;
537 double load;
538 register unsigned int i, j;
539
540 if (cpus == 0)
541 {
542 register unsigned int c, i;
543 struct cpu_config conf;
544 struct stat_descr desc;
545
546 desc.sd_next = 0;
547 desc.sd_subsys = SUBSYS_CPU;
548 desc.sd_type = CPUTYPE_CONFIG;
549 desc.sd_addr = (char *) &conf;
550 desc.sd_size = sizeof conf;
551
552 if (inq_stats (1, &desc))
553 return -1;
554
555 c = 0;
556 for (i = 0; i < conf.config_maxclass; ++i)
557 {
558 struct class_stats stats;
559 bzero ((char *) &stats, sizeof stats);
560
561 desc.sd_type = CPUTYPE_CLASS;
562 desc.sd_objid = i;
563 desc.sd_addr = (char *) &stats;
564 desc.sd_size = sizeof stats;
565
566 if (inq_stats (1, &desc))
567 return -1;
568
569 c += stats.class_numcpus;
570 }
571 cpus = c;
572 samples = cpus < 2 ? 3 : (2 * cpus / 3);
573 }
574
575 proc_info.sd_next = 0;
576 proc_info.sd_subsys = SUBSYS_PROC;
577 proc_info.sd_type = PROCTYPE_SUMMARY;
578 proc_info.sd_addr = (char *) &proc_sum_data;
579 proc_info.sd_size = sizeof (struct proc_summary);
580 proc_info.sd_sizeused = 0;
581
582 if (inq_stats (1, &proc_info) != 0)
583 return -1;
584
585 load = proc_sum_data.ps_nrunnable;
586 j = 0;
587 for (i = samples - 1; i > 0; --i)
588 {
589 load += proc_sum_data.ps_nrun[j];
590 if (j++ == PS_NRUNSIZE)
591 j = 0;
592 }
593
594 if (nelem > 0)
595 loadavg[elem++] = load / samples / cpus;
596#endif /* UMAX */
597
598#if !defined (LDAV_DONE) && defined (DGUX)
599#define LDAV_DONE
600 /* This call can return -1 for an error, but with good args
601 it's not supposed to fail. The first argument is for no
602 apparent reason of type `long int *'. */
603 dg_sys_info ((long int *) &load_info,
604 DG_SYS_INFO_LOAD_INFO_TYPE,
605 DG_SYS_INFO_LOAD_VERSION_0);
606
607 if (nelem > 0)
608 loadavg[elem++] = load_info.one_minute;
609 if (nelem > 1)
610 loadavg[elem++] = load_info.five_minute;
611 if (nelem > 2)
612 loadavg[elem++] = load_info.fifteen_minute;
613#endif /* DGUX */
614
615#if !defined (LDAV_DONE) && defined (apollo)
616#define LDAV_DONE
617/* Apollo code from lisch@mentorg.com (Ray Lischner).
618
619 This system call is not documented. The load average is obtained as
620 three long integers, for the load average over the past minute,
621 five minutes, and fifteen minutes. Each value is a scaled integer,
622 with 16 bits of integer part and 16 bits of fraction part.
623
624 I'm not sure which operating system first supported this system call,
625 but I know that SR10.2 supports it. */
626
627 extern void proc1_$get_loadav ();
628 unsigned long load_ave[3];
629
630 proc1_$get_loadav (load_ave);
631
632 if (nelem > 0)
633 loadavg[elem++] = load_ave[0] / 65536.0;
634 if (nelem > 1)
635 loadavg[elem++] = load_ave[1] / 65536.0;
636 if (nelem > 2)
637 loadavg[elem++] = load_ave[2] / 65536.0;
638#endif /* apollo */
639
640#if !defined (LDAV_DONE) && defined (OSF_MIPS)
641#define LDAV_DONE
1e5ba5b5
RM		 642
643 struct tbl_loadavg load_ave;
644 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
7ee260fe
RM		 645 loadavg[elem++]
646 = (load_ave.tl_lscale == 0
647 ? load_ave.tl_avenrun.d[0]
648 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
1e5ba5b5
RM		 649#endif /* OSF_MIPS */
650
651#if !defined (LDAV_DONE) && defined (VMS)
652 /* VMS specific code -- read from the Load Ave driver. */
653
654 LOAD_AVE_TYPE load_ave[3];
655 static int getloadavg_initialized = 0;
656#ifdef eunice
657 struct
658 {
659 int dsc$w_length;
660 char *dsc$a_pointer;
661 } descriptor;
662#endif
663
664 /* Ensure that there is a channel open to the load ave device. */
665 if (!getloadavg_initialized)
666 {
667 /* Attempt to open the channel. */
668#ifdef eunice
669 descriptor.dsc$w_length = 18;
670 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
671#else
672 $DESCRIPTOR (descriptor, "LAV0:");
673#endif
674 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
675 getloadavg_initialized = 1;
676 }
677
678 /* Read the load average vector. */
679 if (getloadavg_initialized
680 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
681 load_ave, 12, 0, 0, 0, 0) & 1))
682 {
683 sys$dassgn (channel);
684 getloadavg_initialized = 0;
685 }
686
687 if (!getloadavg_initialized)
688 return -1;
689#endif /* VMS */
690
691#if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
692
693 /* UNIX-specific code -- read the average from /dev/kmem. */
694
695#define LDAV_PRIVILEGED /* This code requires special installation. */
696
697 LOAD_AVE_TYPE load_ave[3];
698
699 /* Get the address of LDAV_SYMBOL. */
700 if (offset == 0)
701 {
702#ifndef SUNOS_5
703#ifndef sgi
704#ifndef NLIST_STRUCT
705 strcpy (nl[0].n_name, LDAV_SYMBOL);
706 strcpy (nl[1].n_name, "");
707#else /* NLIST_STRUCT */
708#ifdef NLIST_NAME_UNION
709 nl[0].n_un.n_name = LDAV_SYMBOL;
710 nl[1].n_un.n_name = 0;
711#else /* not NLIST_NAME_UNION */
712 nl[0].n_name = LDAV_SYMBOL;
713 nl[1].n_name = 0;
714#endif /* not NLIST_NAME_UNION */
715#endif /* NLIST_STRUCT */
716
717 if (nlist (KERNEL_FILE, nl) >= 0)
718 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
719 {
720#ifdef FIXUP_KERNEL_SYMBOL_ADDR
721 FIXUP_KERNEL_SYMBOL_ADDR (nl);
722#endif
723 offset = nl[0].n_value;
724 }
725#else /* sgi */
726 int ldav_off;
727
728 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
729 if (ldav_off != -1)
730 offset = (long) ldav_off & 0x7fffffff;
731#endif /* sgi */
732#endif /* !SUNOS_5 */
733 }
734
735 /* Make sure we have /dev/kmem open. */
736 if (!getloadavg_initialized)
737 {
738#ifndef SUNOS_5
739 channel = open ("/dev/kmem", 0);
740 if (channel >= 0)
741 getloadavg_initialized = 1;
742#else /* SUNOS_5 */
743 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
744 if (kd != 0)
745 {
746 kvm_nlist (kd, nl);
747 getloadavg_initialized = 1;
748 }
749#endif /* SUNOS_5 */
750 }
751
752 /* If we can, get the load average values. */
753 if (offset && getloadavg_initialized)
754 {
755 /* Try to read the load. */
756#ifndef SUNOS_5
757 if (lseek (channel, offset, 0) == -1L
758 || read (channel, (char *) load_ave, sizeof (load_ave))
759 != sizeof (load_ave))
760 {
761 close (channel);
762 getloadavg_initialized = 0;
763 }
764#else /* SUNOS_5 */
765 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
766 != sizeof (load_ave))
767 {
768 kvm_close (kd);
769 getloadavg_initialized = 0;
770 }
771#endif /* SUNOS_5 */
772 }
773
774 if (offset == 0 || !getloadavg_initialized)
775 return -1;
776#endif /* LOAD_AVE_TYPE and not VMS */
777
778#if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
779 if (nelem > 0)
780 loadavg[elem++] = LDAV_CVT (load_ave[0]);
781 if (nelem > 1)
782 loadavg[elem++] = LDAV_CVT (load_ave[1]);
783 if (nelem > 2)
784 loadavg[elem++] = LDAV_CVT (load_ave[2]);
785
786#define LDAV_DONE
787#endif /* !LDAV_DONE && LOAD_AVE_TYPE */
788
789#ifdef LDAV_DONE
790 return elem;
791#else
792 /* Set errno to zero to indicate that there was no particular error;
793 this function just can't work at all on this system. */
794 errno = 0;
795 return -1;
796#endif
797}
798\f
799#ifdef TEST
800void
801main (argc, argv)
802 int argc;
803 char **argv;
804{
805 int naptime = 0;
806
807 if (argc > 1)
808 naptime = atoi (argv[1]);
809
810 if (naptime == 0)
811 naptime = 5;
812
813 while (1)
814 {
815 double avg[3];
816 int loads;
817
818 errno = 0; /* Don't be misled if it doesn't set errno. */
819 loads = getloadavg (avg, 3);
820 if (loads == -1)
821 {
822 perror ("Error getting load average");
823 exit (1);
824 }
825 if (loads > 0)
826 printf ("1-minute: %f ", avg[0]);
827 if (loads > 1)
828 printf ("5-minute: %f ", avg[1]);
829 if (loads > 2)
830 printf ("15-minute: %f ", avg[2]);
831 if (loads > 0)
832 putchar ('\n');
833 sleep (naptime);
834 }
835}
836#endif /* TEST */
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