getloadavg.c@ 3633

Last change on this file since 3633 was 3140, checked in by bird, 7 years ago
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1	/* Get the system load averages.
2	Copyright (C) 1985-2016 Free Software Foundation, Inc.
3
4	GNU Make is free software; you can redistribute it and/or modify it under the
5	terms of the GNU General Public License as published by the Free Software
6	Foundation; either version 3 of the License, or (at your option) any later
7	version.
8
9	GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
10	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12
13	You should have received a copy of the GNU General Public License along with
14	this 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
95	extern 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 [email protected]. */
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 [email protected]. */
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
461	static processor_set_t default_set;
462	static int getloadavg_initialized;
463	# endif /* NeXT */
464
465	# ifdef UMAX
466	static unsigned int cpus = 0;
467	static unsigned int samples;
468	# endif /* UMAX */
469
470	# ifdef DGUX
471	static 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. */
476	static int channel;
477	/* Nonzero iff channel is valid. */
478	static int getloadavg_initialized;
479	/* Offset in kmem to seek to read load average, or 0 means invalid. */
480	static long offset;
481
482	#if !defined(VMS) && !defined(sgi) && !defined(__linux__)
483	static struct nlist nl[2];
484	#endif /* Not VMS or sgi */
485
486	#ifdef SUNOS_5
487	static 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
498	int
499	getloadavg (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 [email protected] (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
993	int
994	main (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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source: kBuild/trunk/src/kmk/getloadavg.c@ 3633

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