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-rw-r--r--lib/getloadavg.c1017
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diff --git a/lib/getloadavg.c b/lib/getloadavg.c
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1/* Get the system load averages.
2
3 Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994,
4 1995, 1997, 1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
5
6 NOTE: The canonical source of this file is maintained with gnulib.
7 Bugs can be reported to bug-gnulib@gnu.org.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
12 any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22 USA. */
23
24/* Compile-time symbols that this file uses:
25
26 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
27 pstat_getdynamic function. I think it
28 is unique to HPUX9. The best way to get the
29 definition is through the AC_FUNC_GETLOADAVG
30 macro that comes with autoconf 2.13 or newer.
31 If that isn't an option, then just put
32 AC_CHECK_FUNCS(pstat_getdynamic) in your
33 configure.in file.
34 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
35 KERNEL_FILE Name of the kernel file to nlist.
36 LDAV_CVT() Scale the load average from the kernel.
37 Returns a double.
38 LDAV_SYMBOL Name of kernel symbol giving load average.
39 LOAD_AVE_TYPE Type of the load average array in the kernel.
40 Must be defined unless one of
41 apollo, DGUX, NeXT, or UMAX is defined;
42 or we have libkstat;
43 otherwise, no load average is available.
44 HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults
45 to this.
46 NLIST_STRUCT Include nlist.h, not a.out.h, and
47 the nlist n_name element is a pointer,
48 not an array.
49 HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'.
50 LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing
51 load averages.
52
53 Specific system predefines this file uses, aside from setting
54 default values if not emacs:
55
56 apollo
57 BSD Real BSD, not just BSD-like.
58 convex
59 DGUX
60 eunice UNIX emulator under VMS.
61 hpux
62 __MSDOS__ No-op for MSDOS.
63 NeXT
64 sgi
65 sequent Sequent Dynix 3.x.x (BSD)
66 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
67 sony_news NEWS-OS (works at least for 4.1C)
68 UMAX
69 UMAX4_3
70 VMS
71 WINDOWS32 No-op for Windows95/NT.
72 __linux__ Linux: assumes /proc file system mounted.
73 Support from Michael K. Johnson.
74 __CYGWIN__ Cygwin emulates linux /proc/loadavg.
75 __NetBSD__ NetBSD: assumes /kern file system mounted.
76
77 In addition, to avoid nesting many #ifdefs, we internally set
78 LDAV_DONE to indicate that the load average has been computed.
79
80 We also #define LDAV_PRIVILEGED if a program will require
81 special installation to be able to call getloadavg. */
82
83/* This should always be first. */
84#ifdef HAVE_CONFIG_H
85# include <config.h>
86#endif
87
88#include <errno.h>
89#include <stdbool.h>
90#include <stdio.h>
91#include <stdlib.h>
92
93/* Exclude all the code except the test program at the end
94 if the system has its own `getloadavg' function. */
95
96#ifndef HAVE_GETLOADAVG
97
98# include <sys/types.h>
99
100/* Both the Emacs and non-Emacs sections want this. Some
101 configuration files' definitions for the LOAD_AVE_CVT macro (like
102 sparc.h's) use macros like FSCALE, defined here. */
103# if defined (unix) || defined (__unix)
104# include <sys/param.h>
105# endif
106
107# include "c-strtod.h"
108# include "cloexec.h"
109# include "intprops.h"
110# include "xalloc.h"
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
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# ifndef NLIST_STRUCT
320# if HAVE_NLIST_H
321# define NLIST_STRUCT
322# endif
323# endif
324
325# if defined (sgi) || (defined (mips) && !defined (BSD))
326# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
327# endif
328
329
330# if !defined (KERNEL_FILE) && defined (sequent)
331# define KERNEL_FILE "/dynix"
332# endif
333
334# if !defined (KERNEL_FILE) && defined (hpux)
335# define KERNEL_FILE "/hp-ux"
336# endif
337
338# if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
339# define KERNEL_FILE "/unix"
340# endif
341
342
343# if !defined (LDAV_SYMBOL) && defined (alliant)
344# define LDAV_SYMBOL "_Loadavg"
345# endif
346
347# if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
348# define LDAV_SYMBOL "avenrun"
349# endif
350
351# include <unistd.h>
352
353/* LOAD_AVE_TYPE should only get defined if we're going to use the
354 nlist method. */
355# if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL))
356# define LOAD_AVE_TYPE double
357# endif
358
359# ifdef LOAD_AVE_TYPE
360
361# ifndef VMS
362# ifndef __linux__
363# ifndef NLIST_STRUCT
364# include <a.out.h>
365# else /* NLIST_STRUCT */
366# include <nlist.h>
367# endif /* NLIST_STRUCT */
368
369# ifdef SUNOS_5
370# include <fcntl.h>
371# include <kvm.h>
372# include <kstat.h>
373# endif
374
375# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
376# include <sys/pstat.h>
377# endif
378
379# ifndef KERNEL_FILE
380# define KERNEL_FILE "/vmunix"
381# endif /* KERNEL_FILE */
382
383# ifndef LDAV_SYMBOL
384# define LDAV_SYMBOL "_avenrun"
385# endif /* LDAV_SYMBOL */
386# endif /* __linux__ */
387
388# else /* VMS */
389
390# ifndef eunice
391# include <iodef.h>
392# include <descrip.h>
393# else /* eunice */
394# include <vms/iodef.h>
395# endif /* eunice */
396# endif /* VMS */
397
398# ifndef LDAV_CVT
399# define LDAV_CVT(n) ((double) (n))
400# endif /* !LDAV_CVT */
401
402# endif /* LOAD_AVE_TYPE */
403
404# if defined (__GNU__) && !defined (NeXT)
405/* Note that NeXT Openstep defines __GNU__ even though it should not. */
406/* GNU system acts much like NeXT, for load average purposes,
407 but not exactly. */
408# define NeXT
409# define host_self mach_host_self
410# endif
411
412# ifdef NeXT
413# ifdef HAVE_MACH_MACH_H
414# include <mach/mach.h>
415# else
416# include <mach.h>
417# endif
418# endif /* NeXT */
419
420# ifdef sgi
421# include <sys/sysmp.h>
422# endif /* sgi */
423
424# ifdef UMAX
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# include "fcntl--.h"
451
452/* Avoid static vars inside a function since in HPUX they dump as pure. */
453
454# ifdef NeXT
455static processor_set_t default_set;
456static bool getloadavg_initialized;
457# endif /* NeXT */
458
459# ifdef UMAX
460static unsigned int cpus = 0;
461static unsigned int samples;
462# endif /* UMAX */
463
464# ifdef DGUX
465static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
466# endif /* DGUX */
467
468# if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE)
469/* File descriptor open to /dev/kmem or VMS load ave driver. */
470static int channel;
471/* True iff channel is valid. */
472static bool getloadavg_initialized;
473/* Offset in kmem to seek to read load average, or 0 means invalid. */
474static long offset;
475
476# if !defined (VMS) && !defined (sgi) && !defined (__linux__)
477static struct nlist nl[2];
478# endif /* Not VMS or sgi */
479
480# ifdef SUNOS_5
481static kvm_t *kd;
482# endif /* SUNOS_5 */
483
484# endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
485
486/* Put the 1 minute, 5 minute and 15 minute load averages
487 into the first NELEM elements of LOADAVG.
488 Return the number written (never more than 3, but may be less than NELEM),
489 or -1 if an error occurred. */
490
491int
492getloadavg (double loadavg[], int nelem)
493{
494 int elem = 0; /* Return value. */
495
496# ifdef NO_GET_LOAD_AVG
497# define LDAV_DONE
498 /* Set errno to zero to indicate that there was no particular error;
499 this function just can't work at all on this system. */
500 errno = 0;
501 elem = -1;
502# endif
503
504# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
505/* Use libkstat because we don't have to be root. */
506# define LDAV_DONE
507 kstat_ctl_t *kc;
508 kstat_t *ksp;
509 kstat_named_t *kn;
510
511 kc = kstat_open ();
512 if (kc == 0)
513 return -1;
514 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
515 if (ksp == 0)
516 return -1;
517 if (kstat_read (kc, ksp, 0) == -1)
518 return -1;
519
520
521 kn = kstat_data_lookup (ksp, "avenrun_1min");
522 if (kn == 0)
523 {
524 /* Return -1 if no load average information is available. */
525 nelem = 0;
526 elem = -1;
527 }
528
529 if (nelem >= 1)
530 loadavg[elem++] = (double) kn->value.ul / FSCALE;
531
532 if (nelem >= 2)
533 {
534 kn = kstat_data_lookup (ksp, "avenrun_5min");
535 if (kn != 0)
536 {
537 loadavg[elem++] = (double) kn->value.ul / FSCALE;
538
539 if (nelem >= 3)
540 {
541 kn = kstat_data_lookup (ksp, "avenrun_15min");
542 if (kn != 0)
543 loadavg[elem++] = (double) kn->value.ul / FSCALE;
544 }
545 }
546 }
547
548 kstat_close (kc);
549# endif /* HAVE_LIBKSTAT */
550
551# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
552/* Use pstat_getdynamic() because we don't have to be root. */
553# define LDAV_DONE
554# undef LOAD_AVE_TYPE
555
556 struct pst_dynamic dyn_info;
557 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
558 return -1;
559 if (nelem > 0)
560 loadavg[elem++] = dyn_info.psd_avg_1_min;
561 if (nelem > 1)
562 loadavg[elem++] = dyn_info.psd_avg_5_min;
563 if (nelem > 2)
564 loadavg[elem++] = dyn_info.psd_avg_15_min;
565
566# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
567
568# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__))
569# define LDAV_DONE
570# undef LOAD_AVE_TYPE
571
572# ifndef LINUX_LDAV_FILE
573# define LINUX_LDAV_FILE "/proc/loadavg"
574# endif
575
576 char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")];
577 char const *ptr = ldavgbuf;
578 int fd, count;
579
580 fd = open (LINUX_LDAV_FILE, O_RDONLY);
581 if (fd == -1)
582 return -1;
583 count = read (fd, ldavgbuf, sizeof ldavgbuf - 1);
584 (void) close (fd);
585 if (count <= 0)
586 return -1;
587 ldavgbuf[count] = '\0';
588
589 for (elem = 0; elem < nelem; elem++)
590 {
591 char *endptr;
592 double d = c_strtod (ptr, &endptr);
593 if (ptr == endptr)
594 {
595 if (elem == 0)
596 return -1;
597 break;
598 }
599 loadavg[elem] = d;
600 ptr = endptr;
601 }
602
603 return elem;
604
605# endif /* __linux__ || __CYGWIN__ */
606
607# if !defined (LDAV_DONE) && defined (__NetBSD__)
608# define LDAV_DONE
609# undef LOAD_AVE_TYPE
610
611# ifndef NETBSD_LDAV_FILE
612# define NETBSD_LDAV_FILE "/kern/loadavg"
613# endif
614
615 unsigned long int load_ave[3], scale;
616 int count;
617 FILE *fp;
618
619 fp = fopen (NETBSD_LDAV_FILE, "r");
620 if (fp == NULL)
621 return -1;
622 count = fscanf (fp, "%lu %lu %lu %lu\n",
623 &load_ave[0], &load_ave[1], &load_ave[2],
624 &scale);
625 (void) fclose (fp);
626 if (count != 4)
627 return -1;
628
629 for (elem = 0; elem < nelem; elem++)
630 loadavg[elem] = (double) load_ave[elem] / (double) scale;
631
632 return elem;
633
634# endif /* __NetBSD__ */
635
636# if !defined (LDAV_DONE) && defined (NeXT)
637# define LDAV_DONE
638 /* The NeXT code was adapted from iscreen 3.2. */
639
640 host_t host;
641 struct processor_set_basic_info info;
642 unsigned int info_count;
643
644 /* We only know how to get the 1-minute average for this system,
645 so even if the caller asks for more than 1, we only return 1. */
646
647 if (!getloadavg_initialized)
648 {
649 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
650 getloadavg_initialized = true;
651 }
652
653 if (getloadavg_initialized)
654 {
655 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
656 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
657 (processor_set_info_t) &info, &info_count)
658 != KERN_SUCCESS)
659 getloadavg_initialized = false;
660 else
661 {
662 if (nelem > 0)
663 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
664 }
665 }
666
667 if (!getloadavg_initialized)
668 return -1;
669# endif /* NeXT */
670
671# if !defined (LDAV_DONE) && defined (UMAX)
672# define LDAV_DONE
673/* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
674 have a /dev/kmem. Information about the workings of the running kernel
675 can be gathered with inq_stats system calls.
676 We only know how to get the 1-minute average for this system. */
677
678 struct proc_summary proc_sum_data;
679 struct stat_descr proc_info;
680 double load;
681 register unsigned int i, j;
682
683 if (cpus == 0)
684 {
685 register unsigned int c, i;
686 struct cpu_config conf;
687 struct stat_descr desc;
688
689 desc.sd_next = 0;
690 desc.sd_subsys = SUBSYS_CPU;
691 desc.sd_type = CPUTYPE_CONFIG;
692 desc.sd_addr = (char *) &conf;
693 desc.sd_size = sizeof conf;
694
695 if (inq_stats (1, &desc))
696 return -1;
697
698 c = 0;
699 for (i = 0; i < conf.config_maxclass; ++i)
700 {
701 struct class_stats stats;
702 bzero ((char *) &stats, sizeof stats);
703
704 desc.sd_type = CPUTYPE_CLASS;
705 desc.sd_objid = i;
706 desc.sd_addr = (char *) &stats;
707 desc.sd_size = sizeof stats;
708
709 if (inq_stats (1, &desc))
710 return -1;
711
712 c += stats.class_numcpus;
713 }
714 cpus = c;
715 samples = cpus < 2 ? 3 : (2 * cpus / 3);
716 }
717
718 proc_info.sd_next = 0;
719 proc_info.sd_subsys = SUBSYS_PROC;
720 proc_info.sd_type = PROCTYPE_SUMMARY;
721 proc_info.sd_addr = (char *) &proc_sum_data;
722 proc_info.sd_size = sizeof (struct proc_summary);
723 proc_info.sd_sizeused = 0;
724
725 if (inq_stats (1, &proc_info) != 0)
726 return -1;
727
728 load = proc_sum_data.ps_nrunnable;
729 j = 0;
730 for (i = samples - 1; i > 0; --i)
731 {
732 load += proc_sum_data.ps_nrun[j];
733 if (j++ == PS_NRUNSIZE)
734 j = 0;
735 }
736
737 if (nelem > 0)
738 loadavg[elem++] = load / samples / cpus;
739# endif /* UMAX */
740
741# if !defined (LDAV_DONE) && defined (DGUX)
742# define LDAV_DONE
743 /* This call can return -1 for an error, but with good args
744 it's not supposed to fail. The first argument is for no
745 apparent reason of type `long int *'. */
746 dg_sys_info ((long int *) &load_info,
747 DG_SYS_INFO_LOAD_INFO_TYPE,
748 DG_SYS_INFO_LOAD_VERSION_0);
749
750 if (nelem > 0)
751 loadavg[elem++] = load_info.one_minute;
752 if (nelem > 1)
753 loadavg[elem++] = load_info.five_minute;
754 if (nelem > 2)
755 loadavg[elem++] = load_info.fifteen_minute;
756# endif /* DGUX */
757
758# if !defined (LDAV_DONE) && defined (apollo)
759# define LDAV_DONE
760/* Apollo code from lisch@mentorg.com (Ray Lischner).
761
762 This system call is not documented. The load average is obtained as
763 three long integers, for the load average over the past minute,
764 five minutes, and fifteen minutes. Each value is a scaled integer,
765 with 16 bits of integer part and 16 bits of fraction part.
766
767 I'm not sure which operating system first supported this system call,
768 but I know that SR10.2 supports it. */
769
770 extern void proc1_$get_loadav ();
771 unsigned long load_ave[3];
772
773 proc1_$get_loadav (load_ave);
774
775 if (nelem > 0)
776 loadavg[elem++] = load_ave[0] / 65536.0;
777 if (nelem > 1)
778 loadavg[elem++] = load_ave[1] / 65536.0;
779 if (nelem > 2)
780 loadavg[elem++] = load_ave[2] / 65536.0;
781# endif /* apollo */
782
783# if !defined (LDAV_DONE) && defined (OSF_MIPS)
784# define LDAV_DONE
785
786 struct tbl_loadavg load_ave;
787 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
788 loadavg[elem++]
789 = (load_ave.tl_lscale == 0
790 ? load_ave.tl_avenrun.d[0]
791 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
792# endif /* OSF_MIPS */
793
794# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
795# define LDAV_DONE
796
797 /* A faithful emulation is going to have to be saved for a rainy day. */
798 for ( ; elem < nelem; elem++)
799 {
800 loadavg[elem] = 0.0;
801 }
802# endif /* __MSDOS__ || WINDOWS32 */
803
804# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
805# define LDAV_DONE
806
807 struct tbl_loadavg load_ave;
808 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
809 for (elem = 0; elem < nelem; elem++)
810 loadavg[elem]
811 = (load_ave.tl_lscale == 0
812 ? load_ave.tl_avenrun.d[elem]
813 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
814# endif /* OSF_ALPHA */
815
816# if !defined (LDAV_DONE) && defined (VMS)
817 /* VMS specific code -- read from the Load Ave driver. */
818
819 LOAD_AVE_TYPE load_ave[3];
820 static bool getloadavg_initialized;
821# ifdef eunice
822 struct
823 {
824 int dsc$w_length;
825 char *dsc$a_pointer;
826 } descriptor;
827# endif
828
829 /* Ensure that there is a channel open to the load ave device. */
830 if (!getloadavg_initialized)
831 {
832 /* Attempt to open the channel. */
833# ifdef eunice
834 descriptor.dsc$w_length = 18;
835 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
836# else
837 $DESCRIPTOR (descriptor, "LAV0:");
838# endif
839 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
840 getloadavg_initialized = true;
841 }
842
843 /* Read the load average vector. */
844 if (getloadavg_initialized
845 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
846 load_ave, 12, 0, 0, 0, 0) & 1))
847 {
848 sys$dassgn (channel);
849 getloadavg_initialized = false;
850 }
851
852 if (!getloadavg_initialized)
853 return -1;
854# endif /* VMS */
855
856# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) && !defined (VMS)
857
858 /* UNIX-specific code -- read the average from /dev/kmem. */
859
860# define LDAV_PRIVILEGED /* This code requires special installation. */
861
862 LOAD_AVE_TYPE load_ave[3];
863
864 /* Get the address of LDAV_SYMBOL. */
865 if (offset == 0)
866 {
867# ifndef sgi
868# ifndef NLIST_STRUCT
869 strcpy (nl[0].n_name, LDAV_SYMBOL);
870 strcpy (nl[1].n_name, "");
871# else /* NLIST_STRUCT */
872# ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
873 nl[0].n_un.n_name = LDAV_SYMBOL;
874 nl[1].n_un.n_name = 0;
875# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
876 nl[0].n_name = LDAV_SYMBOL;
877 nl[1].n_name = 0;
878# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
879# endif /* NLIST_STRUCT */
880
881# ifndef SUNOS_5
882 if (
883# if !(defined (_AIX) && !defined (ps2))
884 nlist (KERNEL_FILE, nl)
885# else /* _AIX */
886 knlist (nl, 1, sizeof (nl[0]))
887# endif
888 >= 0)
889 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
890 {
891# ifdef FIXUP_KERNEL_SYMBOL_ADDR
892 FIXUP_KERNEL_SYMBOL_ADDR (nl);
893# endif
894 offset = nl[0].n_value;
895 }
896# endif /* !SUNOS_5 */
897# else /* sgi */
898 int ldav_off;
899
900 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
901 if (ldav_off != -1)
902 offset = (long int) ldav_off & 0x7fffffff;
903# endif /* sgi */
904 }
905
906 /* Make sure we have /dev/kmem open. */
907 if (!getloadavg_initialized)
908 {
909# ifndef SUNOS_5
910 channel = open ("/dev/kmem", O_RDONLY);
911 if (channel >= 0)
912 {
913 /* Set the channel to close on exec, so it does not
914 litter any child's descriptor table. */
915 set_cloexec_flag (channel, true);
916 getloadavg_initialized = true;
917 }
918# else /* SUNOS_5 */
919 /* We pass 0 for the kernel, corefile, and swapfile names
920 to use the currently running kernel. */
921 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
922 if (kd != 0)
923 {
924 /* nlist the currently running kernel. */
925 kvm_nlist (kd, nl);
926 offset = nl[0].n_value;
927 getloadavg_initialized = true;
928 }
929# endif /* SUNOS_5 */
930 }
931
932 /* If we can, get the load average values. */
933 if (offset && getloadavg_initialized)
934 {
935 /* Try to read the load. */
936# ifndef SUNOS_5
937 if (lseek (channel, offset, 0) == -1L
938 || read (channel, (char *) load_ave, sizeof (load_ave))
939 != sizeof (load_ave))
940 {
941 close (channel);
942 getloadavg_initialized = false;
943 }
944# else /* SUNOS_5 */
945 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
946 != sizeof (load_ave))
947 {
948 kvm_close (kd);
949 getloadavg_initialized = false;
950 }
951# endif /* SUNOS_5 */
952 }
953
954 if (offset == 0 || !getloadavg_initialized)
955 return -1;
956# endif /* LOAD_AVE_TYPE and not VMS */
957
958# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
959 if (nelem > 0)
960 loadavg[elem++] = LDAV_CVT (load_ave[0]);
961 if (nelem > 1)
962 loadavg[elem++] = LDAV_CVT (load_ave[1]);
963 if (nelem > 2)
964 loadavg[elem++] = LDAV_CVT (load_ave[2]);
965
966# define LDAV_DONE
967# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
968
969# if !defined LDAV_DONE
970 /* Set errno to zero to indicate that there was no particular error;
971 this function just can't work at all on this system. */
972 errno = 0;
973 elem = -1;
974# endif
975 return elem;
976}
977
978#endif /* ! HAVE_GETLOADAVG */
979
980#ifdef TEST
981int
982main (int argc, char **argv)
983{
984 int naptime = 0;
985
986 if (argc > 1)
987 naptime = atoi (argv[1]);
988
989 while (1)
990 {
991 double avg[3];
992 int loads;
993
994 errno = 0; /* Don't be misled if it doesn't set errno. */
995 loads = getloadavg (avg, 3);
996 if (loads == -1)
997 {
998 perror ("Error getting load average");
999 return EXIT_FAILURE;
1000 }
1001 if (loads > 0)
1002 printf ("1-minute: %f ", avg[0]);
1003 if (loads > 1)
1004 printf ("5-minute: %f ", avg[1]);
1005 if (loads > 2)
1006 printf ("15-minute: %f ", avg[2]);
1007 if (loads > 0)
1008 putchar ('\n');
1009
1010 if (naptime == 0)
1011 break;
1012 sleep (naptime);
1013 }
1014
1015 return EXIT_SUCCESS;
1016}
1017#endif /* TEST */