getloadavg.c

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1	/* Get the system load averages.
2	Copyright (C) 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
3	1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4	Free Software Foundation, Inc.
5
6	GNU Make is free software; you can redistribute it and/or modify it under the
7	terms of the GNU General Public License as published by the Free Software
8	Foundation; either version 3 of the License, or (at your option) any later
9	version.
10
11	GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
12	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13	A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14
15	You should have received a copy of the GNU General Public License along with
16	this program. If not, see <http://www.gnu.org/licenses/>. */
17
18	/* Compile-time symbols that this file uses:
19
20	HAVE_PSTAT_GETDYNAMIC Define this if your system has the
21	pstat_getdynamic function. I think it
22	is unique to HPUX9. The best way to get the
23	definition is through the AC_FUNC_GETLOADAVG
24	macro that comes with autoconf 2.13 or newer.
25	If that isn't an option, then just put
26	AC_CHECK_FUNCS(pstat_getdynamic) in your
27	configure.in file.
28	FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
29	KERNEL_FILE Pathname of the kernel to nlist.
30	LDAV_CVT() Scale the load average from the kernel.
31	Returns a double.
32	LDAV_SYMBOL Name of kernel symbol giving load average.
33	LOAD_AVE_TYPE Type of the load average array in the kernel.
34	Must be defined unless one of
35	apollo, DGUX, NeXT, or UMAX is defined;
36	or we have libkstat;
37	otherwise, no load average is available.
38	NLIST_STRUCT Include nlist.h, not a.out.h, and
39	the nlist n_name element is a pointer,
40	not an array.
41	HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
42	LINUX_LDAV_FILE [__linux__]: File containing load averages.
43
44	Specific system predefines this file uses, aside from setting
45	default values if not emacs:
46
47	apollo
48	BSD Real BSD, not just BSD-like.
49	convex
50	DGUX
51	eunice UNIX emulator under VMS.
52	hpux
53	__MSDOS__ No-op for MSDOS.
54	NeXT
55	sgi
56	sequent Sequent Dynix 3.x.x (BSD)
57	_SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
58	sony_news NEWS-OS (works at least for 4.1C)
59	UMAX
60	UMAX4_3
61	VMS
62	WINDOWS32 No-op for Windows95/NT.
63	__linux__ Linux: assumes /proc filesystem mounted.
64	Support from Michael K. Johnson.
65	__NetBSD__ NetBSD: assumes /kern filesystem mounted.
66
67	In addition, to avoid nesting many #ifdefs, we internally set
68	LDAV_DONE to indicate that the load average has been computed.
69
70	We also #define LDAV_PRIVILEGED if a program will require
71	special installation to be able to call getloadavg. */
72
73	/* This should always be first. */
74	#ifdef HAVE_CONFIG_H
75	# include <config.h>
76	#endif
77
78	#include <sys/types.h>
79
80	/* Both the Emacs and non-Emacs sections want this. Some
81	configuration files' definitions for the LOAD_AVE_CVT macro (like
82	sparc.h's) use macros like FSCALE, defined here. */
83	#if defined (unix) \|\| defined (__unix)
84	# include <sys/param.h>
85	#endif
86
87
88	/* Exclude all the code except the test program at the end
89	if the system has its own `getloadavg' function.
90
91	The declaration of `errno' is needed by the test program
92	as well as the function itself, so it comes first. */
93
94	#include <errno.h>
95
96	#ifndef errno
97	extern int errno;
98	#endif
99
100	#if HAVE_LOCALE_H
101	# include <locale.h>
102	#endif
103	#if !HAVE_SETLOCALE
104	# define setlocale(Category, Locale) /* empty */
105	#endif
106
107	#ifndef HAVE_GETLOADAVG
108
109
110	/* The existing Emacs configuration files define a macro called
111	LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
112	returns the load average multiplied by 100. What we actually want
113	is a macro called LDAV_CVT, which returns the load average as an
114	unmultiplied double.
115
116	For backwards compatibility, we'll define LDAV_CVT in terms of
117	LOAD_AVE_CVT, but future machine config files should just define
118	LDAV_CVT directly. */
119
120	# if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
121	# define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
122	# endif
123
124	# if !defined (BSD) && defined (ultrix)
125	/* Ultrix behaves like BSD on Vaxen. */
126	# define BSD
127	# endif
128
129	# ifdef NeXT
130	/* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
131	conflicts with the definition understood in this file, that this
132	really is BSD. */
133	# undef BSD
134
135	/* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
136	defined to mean that the nlist method should be used, which is not true. */
137	# undef FSCALE
138	# endif
139
140	/* Same issues as for NeXT apply to the HURD-based GNU system. */
141	# ifdef __GNU__
142	# undef BSD
143	# undef FSCALE
144	# endif /* __GNU__ */
145
146	/* Set values that are different from the defaults, which are
147	set a little farther down with #ifndef. */
148
149
150	/* Some shorthands. */
151
152	# if defined (HPUX) && !defined (hpux)
153	# define hpux
154	# endif
155
156	# if defined (__hpux) && !defined (hpux)
157	# define hpux
158	# endif
159
160	# if defined (__sun) && !defined (sun)
161	# define sun
162	# endif
163
164	# if defined(hp300) && !defined(hpux)
165	# define MORE_BSD
166	# endif
167
168	# if defined(ultrix) && defined(mips)
169	# define decstation
170	# endif
171
172	# if defined (__SVR4) && !defined (SVR4)
173	# define SVR4
174	# endif
175
176	# if (defined(sun) && defined(SVR4)) \|\| defined (SOLARIS2)
177	# define SUNOS_5
178	# endif
179
180	# if defined (__osf__) && (defined (__alpha) \|\| defined (__alpha__))
181	# define OSF_ALPHA
182	# include <sys/mbuf.h>
183	# include <sys/socket.h>
184	# include <net/route.h>
185	# include <sys/table.h>
186	# endif
187
188	# if defined (__osf__) && (defined (mips) \|\| defined (__mips__))
189	# define OSF_MIPS
190	# include <sys/table.h>
191	# endif
192
193	/* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
194	default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
195	that with a couple of other things and we'll have a unique match. */
196	# if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
197	# define tek4300 /* Define by emacs, but not by other users. */
198	# endif
199
200	/* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
201	# if defined(__QNX__)
202	# undef SVR4
203	# endif
204
205	/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
206	# ifndef LOAD_AVE_TYPE
207
208	# ifdef MORE_BSD
209	# define LOAD_AVE_TYPE long
210	# endif
211
212	# ifdef sun
213	# define LOAD_AVE_TYPE long
214	# endif
215
216	# ifdef decstation
217	# define LOAD_AVE_TYPE long
218	# endif
219
220	# ifdef _SEQUENT_
221	# define LOAD_AVE_TYPE long
222	# endif
223
224	# ifdef sgi
225	# define LOAD_AVE_TYPE long
226	# endif
227
228	# ifdef SVR4
229	# define LOAD_AVE_TYPE long
230	# endif
231
232	# ifdef sony_news
233	# define LOAD_AVE_TYPE long
234	# endif
235
236	# ifdef sequent
237	# define LOAD_AVE_TYPE long
238	# endif
239
240	# ifdef OSF_ALPHA
241	# define LOAD_AVE_TYPE long
242	# endif
243
244	# if defined (ardent) && defined (titan)
245	# define LOAD_AVE_TYPE long
246	# endif
247
248	# ifdef tek4300
249	# define LOAD_AVE_TYPE long
250	# endif
251
252	# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
253	# define LOAD_AVE_TYPE long
254	# endif
255
256	# ifdef _AIX
257	# define LOAD_AVE_TYPE long
258	# endif
259
260	# ifdef convex
261	# define LOAD_AVE_TYPE double
262	# ifndef LDAV_CVT
263	# define LDAV_CVT(n) (n)
264	# endif
265	# endif
266
267	# endif /* No LOAD_AVE_TYPE. */
268
269	# ifdef OSF_ALPHA
270	/* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
271	according to ghazi@noc.rutgers.edu. */
272	# undef FSCALE
273	# define FSCALE 1024.0
274	# endif
275
276	# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
277	/* <sys/param.h> defines an incorrect value for FSCALE on an
278	Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
279	# undef FSCALE
280	# define FSCALE 100.0
281	# endif
282
283
284	# ifndef FSCALE
285
286	/* SunOS and some others define FSCALE in sys/param.h. */
287
288	# ifdef MORE_BSD
289	# define FSCALE 2048.0
290	# endif
291
292	# if defined(MIPS) \|\| defined(SVR4) \|\| defined(decstation)
293	# define FSCALE 256
294	# endif
295
296	# if defined (sgi) \|\| defined (sequent)
297	/* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
298	above under #ifdef MIPS. But we want the sgi value. */
299	# undef FSCALE
300	# define FSCALE 1000.0
301	# endif
302
303	# if defined (ardent) && defined (titan)
304	# define FSCALE 65536.0
305	# endif
306
307	# ifdef tek4300
308	# define FSCALE 100.0
309	# endif
310
311	# ifdef _AIX
312	# define FSCALE 65536.0
313	# endif
314
315	# endif /* Not FSCALE. */
316
317	# if !defined (LDAV_CVT) && defined (FSCALE)
318	# define LDAV_CVT(n) (((double) (n)) / FSCALE)
319	# endif
320
321
322	# if defined(sgi) \|\| (defined(mips) && !defined(BSD))
323	# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
324	# endif
325
326
327	# if !defined (KERNEL_FILE) && defined (sequent)
328	# define KERNEL_FILE "/dynix"
329	# endif
330
331	# if !defined (KERNEL_FILE) && defined (hpux)
332	# define KERNEL_FILE "/hp-ux"
333	# endif
334
335	# if !defined(KERNEL_FILE) && (defined(_SEQUENT_) \|\| defined(MIPS) \|\| defined(SVR4) \|\| defined(ISC) \|\| defined (sgi) \|\| (defined (ardent) && defined (titan)))
336	# define KERNEL_FILE "/unix"
337	# endif
338
339
340	# if !defined (LDAV_SYMBOL) && defined (alliant)
341	# define LDAV_SYMBOL "_Loadavg"
342	# endif
343
344	# if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) \|\| defined(_SEQUENT_) \|\| defined(SVR4) \|\| defined(ISC) \|\| defined(sgi) \|\| (defined (ardent) && defined (titan)) \|\| defined (_AIX))
345	# define LDAV_SYMBOL "avenrun"
346	# endif
347
348	# ifdef HAVE_UNISTD_H
349	# include <unistd.h>
350	# endif
351
352	# include <stdio.h>
353
354	/* LOAD_AVE_TYPE should only get defined if we're going to use the
355	nlist method. */
356	# if !defined(LOAD_AVE_TYPE) && (defined(BSD) \|\| defined(LDAV_CVT) \|\| defined(KERNEL_FILE) \|\| defined(LDAV_SYMBOL)) && !defined(__riscos__)
357	# define LOAD_AVE_TYPE double
358	# endif
359
360	# ifdef LOAD_AVE_TYPE
361
362	# ifndef VMS
363	# ifndef __linux__
364	# ifdef HAVE_NLIST_H
365	# include <nlist.h>
366	# else
367	# include <a.out.h>
368	# endif
369
370	# ifdef SUNOS_5
371	# include <fcntl.h>
372	# include <kvm.h>
373	# include <kstat.h>
374	# endif
375
376	# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
377	# include <sys/pstat.h>
378	# endif
379
380	# ifndef KERNEL_FILE
381	# define KERNEL_FILE "/vmunix"
382	# endif /* KERNEL_FILE */
383
384	# ifndef LDAV_SYMBOL
385	# define LDAV_SYMBOL "_avenrun"
386	# endif /* LDAV_SYMBOL */
387	# endif /* __linux__ */
388
389	# else /* VMS */
390
391	# ifndef eunice
392	# include <iodef.h>
393	# include <descrip.h>
394	# else /* eunice */
395	# include <vms/iodef.h>
396	# endif /* eunice */
397	# endif /* VMS */
398
399	# ifndef LDAV_CVT
400	# define LDAV_CVT(n) ((double) (n))
401	# endif /* !LDAV_CVT */
402
403	# endif /* LOAD_AVE_TYPE */
404
405	# if defined(__GNU__) && !defined (NeXT)
406	/* Note that NeXT Openstep defines __GNU__ even though it should not. */
407	/* GNU system acts much like NeXT, for load average purposes,
408	but not exactly. */
409	# define NeXT
410	# define host_self mach_host_self
411	# endif
412
413	# ifdef NeXT
414	# ifdef HAVE_MACH_MACH_H
415	# include <mach/mach.h>
416	# else
417	# include <mach.h>
418	# endif
419	# endif /* NeXT */
420
421	# ifdef sgi
422	# include <sys/sysmp.h>
423	# endif /* sgi */
424
425	# ifdef UMAX
426	# include <stdio.h>
427	# include <signal.h>
428	# include <sys/time.h>
429	# include <sys/wait.h>
430	# include <sys/syscall.h>
431
432	# ifdef UMAX_43
433	# include <machine/cpu.h>
434	# include <inq_stats/statistics.h>
435	# include <inq_stats/sysstats.h>
436	# include <inq_stats/cpustats.h>
437	# include <inq_stats/procstats.h>
438	# else /* Not UMAX_43. */
439	# include <sys/sysdefs.h>
440	# include <sys/statistics.h>
441	# include <sys/sysstats.h>
442	# include <sys/cpudefs.h>
443	# include <sys/cpustats.h>
444	# include <sys/procstats.h>
445	# endif /* Not UMAX_43. */
446	# endif /* UMAX */
447
448	# ifdef DGUX
449	# include <sys/dg_sys_info.h>
450	# endif
451
452	# if defined(HAVE_FCNTL_H) \|\| defined(_POSIX_VERSION)
453	# include <fcntl.h>
454	# else
455	# include <sys/file.h>
456	# endif
457
458
459
460	/* Avoid static vars inside a function since in HPUX they dump as pure. */
461
462	# ifdef NeXT
463	static processor_set_t default_set;
464	static int getloadavg_initialized;
465	# endif /* NeXT */
466
467	# ifdef UMAX
468	static unsigned int cpus = 0;
469	static unsigned int samples;
470	# endif /* UMAX */
471
472	# ifdef DGUX
473	static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
474	# endif /* DGUX */
475
476	#if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
477	/* File descriptor open to /dev/kmem or VMS load ave driver. */
478	static int channel;
479	/* Nonzero iff channel is valid. */
480	static int getloadavg_initialized;
481	/* Offset in kmem to seek to read load average, or 0 means invalid. */
482	static long offset;
483
484	#if !defined(VMS) && !defined(sgi) && !defined(__linux__)
485	static struct nlist nl[2];
486	#endif /* Not VMS or sgi */
487
488	#ifdef SUNOS_5
489	static kvm_t *kd;
490	#endif /* SUNOS_5 */
491
492	#endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
493
494
495	/* Put the 1 minute, 5 minute and 15 minute load averages
496	into the first NELEM elements of LOADAVG.
497	Return the number written (never more than 3, but may be less than NELEM),
498	or -1 if an error occurred. */
499
500	int
501	getloadavg (double loadavg[], int nelem)
502	{
503	int elem = 0; /* Return value. */
504
505	# ifdef NO_GET_LOAD_AVG
506	# define LDAV_DONE
507	/* Set errno to zero to indicate that there was no particular error;
508	this function just can't work at all on this system. */
509	errno = 0;
510	elem = -1;
511	# endif
512
513	# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
514	/* Use libkstat because we don't have to be root. */
515	# define LDAV_DONE
516	kstat_ctl_t *kc;
517	kstat_t *ksp;
518	kstat_named_t *kn;
519
520	kc = kstat_open ();
521	if (kc == 0)
522	return -1;
523	ksp = kstat_lookup (kc, "unix", 0, "system_misc");
524	if (ksp == 0 )
525	return -1;
526	if (kstat_read (kc, ksp, 0) == -1)
527	return -1;
528
529
530	kn = kstat_data_lookup (ksp, "avenrun_1min");
531	if (kn == 0)
532	{
533	/* Return -1 if no load average information is available. */
534	nelem = 0;
535	elem = -1;
536	}
537
538	if (nelem >= 1)
539	loadavg[elem++] = (double) kn->value.ul/FSCALE;
540
541	if (nelem >= 2)
542	{
543	kn = kstat_data_lookup (ksp, "avenrun_5min");
544	if (kn != 0)
545	{
546	loadavg[elem++] = (double) kn->value.ul/FSCALE;
547
548	if (nelem >= 3)
549	{
550	kn = kstat_data_lookup (ksp, "avenrun_15min");
551	if (kn != 0)
552	loadavg[elem++] = (double) kn->value.ul/FSCALE;
553	}
554	}
555	}
556
557	kstat_close (kc);
558	# endif /* HAVE_LIBKSTAT */
559
560	# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
561	/* Use pstat_getdynamic() because we don't have to be root. */
562	# define LDAV_DONE
563	# undef LOAD_AVE_TYPE
564
565	struct pst_dynamic dyn_info;
566	if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
567	return -1;
568	if (nelem > 0)
569	loadavg[elem++] = dyn_info.psd_avg_1_min;
570	if (nelem > 1)
571	loadavg[elem++] = dyn_info.psd_avg_5_min;
572	if (nelem > 2)
573	loadavg[elem++] = dyn_info.psd_avg_15_min;
574
575	# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
576
577	# if !defined (LDAV_DONE) && defined (__linux__)
578	# define LDAV_DONE
579	# undef LOAD_AVE_TYPE
580
581	# ifndef LINUX_LDAV_FILE
582	# define LINUX_LDAV_FILE "/proc/loadavg"
583	# endif
584
585	char ldavgbuf[40];
586	double load_ave[3];
587	int fd, count;
588
589	fd = open (LINUX_LDAV_FILE, O_RDONLY);
590	if (fd == -1)
591	return -1;
592	count = read (fd, ldavgbuf, 40);
593	(void) close (fd);
594	if (count <= 0)
595	return -1;
596
597	/* The following sscanf must use the C locale. */
598	setlocale (LC_NUMERIC, "C");
599	count = sscanf (ldavgbuf, "%lf %lf %lf",
600	&load_ave[0], &load_ave[1], &load_ave[2]);
601	setlocale (LC_NUMERIC, "");
602	if (count < 1)
603	return -1;
604
605	for (elem = 0; elem < nelem && elem < count; elem++)
606	loadavg[elem] = load_ave[elem];
607
608	return elem;
609
610	# endif /* __linux__ */
611
612	# if !defined (LDAV_DONE) && defined (__NetBSD__)
613	# define LDAV_DONE
614	# undef LOAD_AVE_TYPE
615
616	# ifndef NETBSD_LDAV_FILE
617	# define NETBSD_LDAV_FILE "/kern/loadavg"
618	# endif
619
620	unsigned long int load_ave[3], scale;
621	int count;
622	FILE *fp;
623
624	fp = fopen (NETBSD_LDAV_FILE, "r");
625	if (fp == NULL)
626	return -1;
627	count = fscanf (fp, "%lu %lu %lu %lu\n",
628	&load_ave[0], &load_ave[1], &load_ave[2],
629	&scale);
630	(void) fclose (fp);
631	if (count != 4)
632	return -1;
633
634	for (elem = 0; elem < nelem; elem++)
635	loadavg[elem] = (double) load_ave[elem] / (double) scale;
636
637	return elem;
638
639	# endif /* __NetBSD__ */
640
641	# if !defined (LDAV_DONE) && defined (NeXT)
642	# define LDAV_DONE
643	/* The NeXT code was adapted from iscreen 3.2. */
644
645	host_t host;
646	struct processor_set_basic_info info;
647	unsigned info_count;
648
649	/* We only know how to get the 1-minute average for this system,
650	so even if the caller asks for more than 1, we only return 1. */
651
652	if (!getloadavg_initialized)
653	{
654	if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
655	getloadavg_initialized = 1;
656	}
657
658	if (getloadavg_initialized)
659	{
660	info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
661	if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
662	(processor_set_info_t) &info, &info_count)
663	!= KERN_SUCCESS)
664	getloadavg_initialized = 0;
665	else
666	{
667	if (nelem > 0)
668	loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
669	}
670	}
671
672	if (!getloadavg_initialized)
673	return -1;
674	# endif /* NeXT */
675
676	# if !defined (LDAV_DONE) && defined (UMAX)
677	# define LDAV_DONE
678	/* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
679	have a /dev/kmem. Information about the workings of the running kernel
680	can be gathered with inq_stats system calls.
681	We only know how to get the 1-minute average for this system. */
682
683	struct proc_summary proc_sum_data;
684	struct stat_descr proc_info;
685	double load;
686	register unsigned int i, j;
687
688	if (cpus == 0)
689	{
690	register unsigned int c, i;
691	struct cpu_config conf;
692	struct stat_descr desc;
693
694	desc.sd_next = 0;
695	desc.sd_subsys = SUBSYS_CPU;
696	desc.sd_type = CPUTYPE_CONFIG;
697	desc.sd_addr = (char *) &conf;
698	desc.sd_size = sizeof conf;
699
700	if (inq_stats (1, &desc))
701	return -1;
702
703	c = 0;
704	for (i = 0; i < conf.config_maxclass; ++i)
705	{
706	struct class_stats stats;
707	memset (&stats, '\0', sizeof stats);
708
709	desc.sd_type = CPUTYPE_CLASS;
710	desc.sd_objid = i;
711	desc.sd_addr = (char *) &stats;
712	desc.sd_size = sizeof stats;
713
714	if (inq_stats (1, &desc))
715	return -1;
716
717	c += stats.class_numcpus;
718	}
719	cpus = c;
720	samples = cpus < 2 ? 3 : (2 * cpus / 3);
721	}
722
723	proc_info.sd_next = 0;
724	proc_info.sd_subsys = SUBSYS_PROC;
725	proc_info.sd_type = PROCTYPE_SUMMARY;
726	proc_info.sd_addr = (char *) &proc_sum_data;
727	proc_info.sd_size = sizeof (struct proc_summary);
728	proc_info.sd_sizeused = 0;
729
730	if (inq_stats (1, &proc_info) != 0)
731	return -1;
732
733	load = proc_sum_data.ps_nrunnable;
734	j = 0;
735	for (i = samples - 1; i > 0; --i)
736	{
737	load += proc_sum_data.ps_nrun[j];
738	if (j++ == PS_NRUNSIZE)
739	j = 0;
740	}
741
742	if (nelem > 0)
743	loadavg[elem++] = load / samples / cpus;
744	# endif /* UMAX */
745
746	# if !defined (LDAV_DONE) && defined (DGUX)
747	# define LDAV_DONE
748	/* This call can return -1 for an error, but with good args
749	it's not supposed to fail. The first argument is for no
750	apparent reason of type `long int '. /
751	dg_sys_info ((long int *) &load_info,
752	DG_SYS_INFO_LOAD_INFO_TYPE,
753	DG_SYS_INFO_LOAD_VERSION_0);
754
755	if (nelem > 0)
756	loadavg[elem++] = load_info.one_minute;
757	if (nelem > 1)
758	loadavg[elem++] = load_info.five_minute;
759	if (nelem > 2)
760	loadavg[elem++] = load_info.fifteen_minute;
761	# endif /* DGUX */
762
763	# if !defined (LDAV_DONE) && defined (apollo)
764	# define LDAV_DONE
765	/* Apollo code from lisch@mentorg.com (Ray Lischner).
766
767	This system call is not documented. The load average is obtained as
768	three long integers, for the load average over the past minute,
769	five minutes, and fifteen minutes. Each value is a scaled integer,
770	with 16 bits of integer part and 16 bits of fraction part.
771
772	I'm not sure which operating system first supported this system call,
773	but I know that SR10.2 supports it. */
774
775	extern void proc1_$get_loadav ();
776	unsigned long load_ave[3];
777
778	proc1_$get_loadav (load_ave);
779
780	if (nelem > 0)
781	loadavg[elem++] = load_ave[0] / 65536.0;
782	if (nelem > 1)
783	loadavg[elem++] = load_ave[1] / 65536.0;
784	if (nelem > 2)
785	loadavg[elem++] = load_ave[2] / 65536.0;
786	# endif /* apollo */
787
788	# if !defined (LDAV_DONE) && defined (OSF_MIPS)
789	# define LDAV_DONE
790
791	struct tbl_loadavg load_ave;
792	table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
793	loadavg[elem++]
794	= (load_ave.tl_lscale == 0
795	? load_ave.tl_avenrun.d[0]
796	: (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
797	# endif /* OSF_MIPS */
798
799	# if !defined (LDAV_DONE) && (defined (__MSDOS__) \|\| defined (WINDOWS32))
800	# define LDAV_DONE
801
802	/* A faithful emulation is going to have to be saved for a rainy day. */
803	for ( ; elem < nelem; elem++)
804	{
805	loadavg[elem] = 0.0;
806	}
807	# endif /* __MSDOS__ \|\| WINDOWS32 */
808
809	# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
810	# define LDAV_DONE
811
812	struct tbl_loadavg load_ave;
813	table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
814	for (elem = 0; elem < nelem; elem++)
815	loadavg[elem]
816	= (load_ave.tl_lscale == 0
817	? load_ave.tl_avenrun.d[elem]
818	: (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
819	# endif /* OSF_ALPHA */
820
821	# if !defined (LDAV_DONE) && defined (VMS)
822	/* VMS specific code -- read from the Load Ave driver. */
823
824	LOAD_AVE_TYPE load_ave[3];
825	static int getloadavg_initialized = 0;
826	# ifdef eunice
827	struct
828	{
829	int dsc$w_length;
830	char *dsc$a_pointer;
831	} descriptor;
832	# endif
833
834	/* Ensure that there is a channel open to the load ave device. */
835	if (!getloadavg_initialized)
836	{
837	/* Attempt to open the channel. */
838	# ifdef eunice
839	descriptor.dsc$w_length = 18;
840	descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
841	# else
842	$DESCRIPTOR (descriptor, "LAV0:");
843	# endif
844	if (sys$assign (&descriptor, &channel, 0, 0) & 1)
845	getloadavg_initialized = 1;
846	}
847
848	/* Read the load average vector. */
849	if (getloadavg_initialized
850	&& !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
851	load_ave, 12, 0, 0, 0, 0) & 1))
852	{
853	sys$dassgn (channel);
854	getloadavg_initialized = 0;
855	}
856
857	if (!getloadavg_initialized)
858	return -1;
859	# endif /* VMS */
860
861	# if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
862
863	/* UNIX-specific code -- read the average from /dev/kmem. */
864
865	# define LDAV_PRIVILEGED /* This code requires special installation. */
866
867	LOAD_AVE_TYPE load_ave[3];
868
869	/* Get the address of LDAV_SYMBOL. */
870	if (offset == 0)
871	{
872	# ifndef sgi
873	# ifndef NLIST_STRUCT
874	strcpy (nl[0].n_name, LDAV_SYMBOL);
875	strcpy (nl[1].n_name, "");
876	# else /* NLIST_STRUCT */
877	# ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
878	nl[0].n_un.n_name = LDAV_SYMBOL;
879	nl[1].n_un.n_name = 0;
880	# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
881	nl[0].n_name = LDAV_SYMBOL;
882	nl[1].n_name = 0;
883	# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
884	# endif /* NLIST_STRUCT */
885
886	# ifndef SUNOS_5
887	if (
888	# if !(defined (_AIX) && !defined (ps2))
889	nlist (KERNEL_FILE, nl)
890	# else /* _AIX */
891	knlist (nl, 1, sizeof (nl[0]))
892	# endif
893	>= 0)
894	/* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
895	{
896	# ifdef FIXUP_KERNEL_SYMBOL_ADDR
897	FIXUP_KERNEL_SYMBOL_ADDR (nl);
898	# endif
899	offset = nl[0].n_value;
900	}
901	# endif /* !SUNOS_5 */
902	# else /* sgi */
903	int ldav_off;
904
905	ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
906	if (ldav_off != -1)
907	offset = (long) ldav_off & 0x7fffffff;
908	# endif /* sgi */
909	}
910
911	/* Make sure we have /dev/kmem open. */
912	if (!getloadavg_initialized)
913	{
914	# ifndef SUNOS_5
915	channel = open ("/dev/kmem", 0);
916	if (channel >= 0)
917	{
918	/* Set the channel to close on exec, so it does not
919	litter any child's descriptor table. */
920	# ifdef F_SETFD
921	# ifndef FD_CLOEXEC
922	# define FD_CLOEXEC 1
923	# endif
924	(void) fcntl (channel, F_SETFD, FD_CLOEXEC);
925	# endif
926	getloadavg_initialized = 1;
927	}
928	# else /* SUNOS_5 */
929	/* We pass 0 for the kernel, corefile, and swapfile names
930	to use the currently running kernel. */
931	kd = kvm_open (0, 0, 0, O_RDONLY, 0);
932	if (kd != 0)
933	{
934	/* nlist the currently running kernel. */
935	kvm_nlist (kd, nl);
936	offset = nl[0].n_value;
937	getloadavg_initialized = 1;
938	}
939	# endif /* SUNOS_5 */
940	}
941
942	/* If we can, get the load average values. */
943	if (offset && getloadavg_initialized)
944	{
945	/* Try to read the load. */
946	# ifndef SUNOS_5
947	if (lseek (channel, offset, 0) == -1L
948	\|\| read (channel, (char *) load_ave, sizeof (load_ave))
949	!= sizeof (load_ave))
950	{
951	close (channel);
952	getloadavg_initialized = 0;
953	}
954	# else /* SUNOS_5 */
955	if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
956	!= sizeof (load_ave))
957	{
958	kvm_close (kd);
959	getloadavg_initialized = 0;
960	}
961	# endif /* SUNOS_5 */
962	}
963
964	if (offset == 0 \|\| !getloadavg_initialized)
965	return -1;
966	# endif /* LOAD_AVE_TYPE and not VMS */
967
968	# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
969	if (nelem > 0)
970	loadavg[elem++] = LDAV_CVT (load_ave[0]);
971	if (nelem > 1)
972	loadavg[elem++] = LDAV_CVT (load_ave[1]);
973	if (nelem > 2)
974	loadavg[elem++] = LDAV_CVT (load_ave[2]);
975
976	# define LDAV_DONE
977	# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
978
979	# ifdef LDAV_DONE
980	return elem;
981	# else
982	/* Set errno to zero to indicate that there was no particular error;
983	this function just can't work at all on this system. */
984	errno = 0;
985	return -1;
986	# endif
987	}
988
989	#endif /* ! HAVE_GETLOADAVG */
990
991
992	#ifdef TEST
993	#include "make.h"
994
995	int
996	main (int argc, char **argv)
997	{
998	int naptime = 0;
999
1000	if (argc > 1)
1001	naptime = atoi (argv[1]);
1002
1003	while (1)
1004	{
1005	double avg[3];
1006	int loads;
1007
1008	errno = 0; /* Don't be misled if it doesn't set errno. */
1009	loads = getloadavg (avg, 3);
1010	if (loads == -1)
1011	{
1012	perror ("Error getting load average");
1013	exit (1);
1014	}
1015	if (loads > 0)
1016	printf ("1-minute: %f ", avg[0]);
1017	if (loads > 1)
1018	printf ("5-minute: %f ", avg[1]);
1019	if (loads > 2)
1020	printf ("15-minute: %f ", avg[2]);
1021	if (loads > 0)
1022	putchar ('\n');
1023
1024	if (naptime == 0)
1025	break;
1026	sleep (naptime);
1027	}
1028
1029	exit (0);
1030	}
1031	#endif /* TEST */

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source: kBuild/vendor/gnumake/2008-10-28/getloadavg.c

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