getloadavg.c@ 281

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1	/* Get the system load averages.
2	Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995, 1997
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18	USA. */
19
20	/* Compile-time symbols that this file uses:
21
22	HAVE_PSTAT_GETDYNAMIC Define this if your system has the
23	pstat_getdynamic function. I think it
24	is unique to HPUX9. The best way to get the
25	definition is through the AC_FUNC_GETLOADAVG
26	macro that comes with autoconf 2.13 or newer.
27	If that isn't an option, then just put
28	AC_CHECK_FUNCS(pstat_getdynamic) in your
29	configure.in file.
30	FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
31	KERNEL_FILE Pathname of the kernel to nlist.
32	LDAV_CVT() Scale the load average from the kernel.
33	Returns a double.
34	LDAV_SYMBOL Name of kernel symbol giving load average.
35	LOAD_AVE_TYPE Type of the load average array in the kernel.
36	Must be defined unless one of
37	apollo, DGUX, NeXT, or UMAX is defined;
38	or we have libkstat;
39	otherwise, no load average is available.
40	NLIST_STRUCT Include nlist.h, not a.out.h, and
41	the nlist n_name element is a pointer,
42	not an array.
43	HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
44	LINUX_LDAV_FILE [__linux__]: File containing load averages.
45
46	Specific system predefines this file uses, aside from setting
47	default values if not emacs:
48
49	apollo
50	BSD Real BSD, not just BSD-like.
51	convex
52	DGUX
53	eunice UNIX emulator under VMS.
54	hpux
55	__MSDOS__ No-op for MSDOS.
56	NeXT
57	sgi
58	sequent Sequent Dynix 3.x.x (BSD)
59	_SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
60	sony_news NEWS-OS (works at least for 4.1C)
61	UMAX
62	UMAX4_3
63	VMS
64	WINDOWS32 No-op for Windows95/NT.
65	__linux__ Linux: assumes /proc filesystem mounted.
66	Support from Michael K. Johnson.
67	__NetBSD__ NetBSD: assumes /kern filesystem mounted.
68
69	In addition, to avoid nesting many #ifdefs, we internally set
70	LDAV_DONE to indicate that the load average has been computed.
71
72	We also #define LDAV_PRIVILEGED if a program will require
73	special installation to be able to call getloadavg. */
74
75	/* This should always be first. */
76	#ifdef HAVE_CONFIG_H
77	# include <config.h>
78	#endif
79
80	#include <sys/types.h>
81
82	/* Both the Emacs and non-Emacs sections want this. Some
83	configuration files' definitions for the LOAD_AVE_CVT macro (like
84	sparc.h's) use macros like FSCALE, defined here. */
85	#if defined (unix) \|\| defined (__unix)
86	# include <sys/param.h>
87	#endif
88
89
90	/* Exclude all the code except the test program at the end
91	if the system has its own `getloadavg' function.
92
93	The declaration of `errno' is needed by the test program
94	as well as the function itself, so it comes first. */
95
96	#include <errno.h>
97
98	#ifndef errno
99	extern int errno;
100	#endif
101
102	#if HAVE_LOCALE_H
103	# include <locale.h>
104	#endif
105	#if !HAVE_SETLOCALE
106	# define setlocale(Category, Locale) /* empty */
107	#endif
108
109	#ifndef HAVE_GETLOADAVG
110
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	/* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
203	# if defined(__QNX__)
204	# undef SVR4
205	# endif
206
207	/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
208	# ifndef LOAD_AVE_TYPE
209
210	# ifdef MORE_BSD
211	# define LOAD_AVE_TYPE long
212	# endif
213
214	# ifdef sun
215	# define LOAD_AVE_TYPE long
216	# endif
217
218	# ifdef decstation
219	# define LOAD_AVE_TYPE long
220	# endif
221
222	# ifdef _SEQUENT_
223	# define LOAD_AVE_TYPE long
224	# endif
225
226	# ifdef sgi
227	# define LOAD_AVE_TYPE long
228	# endif
229
230	# ifdef SVR4
231	# define LOAD_AVE_TYPE long
232	# endif
233
234	# ifdef sony_news
235	# define LOAD_AVE_TYPE long
236	# endif
237
238	# ifdef sequent
239	# define LOAD_AVE_TYPE long
240	# endif
241
242	# ifdef OSF_ALPHA
243	# define LOAD_AVE_TYPE long
244	# endif
245
246	# if defined (ardent) && defined (titan)
247	# define LOAD_AVE_TYPE long
248	# endif
249
250	# ifdef tek4300
251	# define LOAD_AVE_TYPE long
252	# endif
253
254	# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
255	# define LOAD_AVE_TYPE long
256	# endif
257
258	# ifdef _AIX
259	# define LOAD_AVE_TYPE long
260	# endif
261
262	# ifdef convex
263	# define LOAD_AVE_TYPE double
264	# ifndef LDAV_CVT
265	# define LDAV_CVT(n) (n)
266	# endif
267	# endif
268
269	# endif /* No LOAD_AVE_TYPE. */
270
271	# ifdef OSF_ALPHA
272	/* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
273	according to [email protected]. */
274	# undef FSCALE
275	# define FSCALE 1024.0
276	# endif
277
278	# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
279	/* <sys/param.h> defines an incorrect value for FSCALE on an
280	Alliant FX/2800 Concentrix 2.2, according to [email protected]. */
281	# undef FSCALE
282	# define FSCALE 100.0
283	# endif
284
285
286	# ifndef FSCALE
287
288	/* SunOS and some others define FSCALE in sys/param.h. */
289
290	# ifdef MORE_BSD
291	# define FSCALE 2048.0
292	# endif
293
294	# if defined(MIPS) \|\| defined(SVR4) \|\| defined(decstation)
295	# define FSCALE 256
296	# endif
297
298	# if defined (sgi) \|\| defined (sequent)
299	/* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
300	above under #ifdef MIPS. But we want the sgi value. */
301	# undef FSCALE
302	# define FSCALE 1000.0
303	# endif
304
305	# if defined (ardent) && defined (titan)
306	# define FSCALE 65536.0
307	# endif
308
309	# ifdef tek4300
310	# define FSCALE 100.0
311	# endif
312
313	# ifdef _AIX
314	# define FSCALE 65536.0
315	# endif
316
317	# endif /* Not FSCALE. */
318
319	# if !defined (LDAV_CVT) && defined (FSCALE)
320	# define LDAV_CVT(n) (((double) (n)) / FSCALE)
321	# endif
322
323
324	# if defined(sgi) \|\| (defined(mips) && !defined(BSD))
325	# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
326	# endif
327
328
329	# if !defined (KERNEL_FILE) && defined (sequent)
330	# define KERNEL_FILE "/dynix"
331	# endif
332
333	# if !defined (KERNEL_FILE) && defined (hpux)
334	# define KERNEL_FILE "/hp-ux"
335	# endif
336
337	# if !defined(KERNEL_FILE) && (defined(_SEQUENT_) \|\| defined(MIPS) \|\| defined(SVR4) \|\| defined(ISC) \|\| defined (sgi) \|\| (defined (ardent) && defined (titan)))
338	# define KERNEL_FILE "/unix"
339	# endif
340
341
342	# if !defined (LDAV_SYMBOL) && defined (alliant)
343	# define LDAV_SYMBOL "_Loadavg"
344	# endif
345
346	# if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) \|\| defined(_SEQUENT_) \|\| defined(SVR4) \|\| defined(ISC) \|\| defined(sgi) \|\| (defined (ardent) && defined (titan)) \|\| defined (_AIX))
347	# define LDAV_SYMBOL "avenrun"
348	# endif
349
350	# ifdef HAVE_UNISTD_H
351	# include <unistd.h>
352	# endif
353
354	# include <stdio.h>
355
356	/* LOAD_AVE_TYPE should only get defined if we're going to use the
357	nlist method. */
358	# if !defined(LOAD_AVE_TYPE) && (defined(BSD) \|\| defined(LDAV_CVT) \|\| defined(KERNEL_FILE) \|\| defined(LDAV_SYMBOL)) && !defined(__riscos__)
359	# define LOAD_AVE_TYPE double
360	# endif
361
362	# ifdef LOAD_AVE_TYPE
363
364	# ifndef VMS
365	# ifndef __linux__
366	# ifdef HAVE_NLIST_H
367	# include <nlist.h>
368	# else
369	# include <a.out.h>
370	# endif
371
372	# ifdef SUNOS_5
373	# include <fcntl.h>
374	# include <kvm.h>
375	# include <kstat.h>
376	# endif
377
378	# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
379	# include <sys/pstat.h>
380	# endif
381
382	# ifndef KERNEL_FILE
383	# define KERNEL_FILE "/vmunix"
384	# endif /* KERNEL_FILE */
385
386	# ifndef LDAV_SYMBOL
387	# define LDAV_SYMBOL "_avenrun"
388	# endif /* LDAV_SYMBOL */
389	# endif /* __linux__ */
390
391	# else /* VMS */
392
393	# ifndef eunice
394	# include <iodef.h>
395	# include <descrip.h>
396	# else /* eunice */
397	# include <vms/iodef.h>
398	# endif /* eunice */
399	# endif /* VMS */
400
401	# ifndef LDAV_CVT
402	# define LDAV_CVT(n) ((double) (n))
403	# endif /* !LDAV_CVT */
404
405	# endif /* LOAD_AVE_TYPE */
406
407	# if defined(__GNU__) && !defined (NeXT)
408	/* Note that NeXT Openstep defines __GNU__ even though it should not. */
409	/* GNU system acts much like NeXT, for load average purposes,
410	but not exactly. */
411	# define NeXT
412	# define host_self mach_host_self
413	# endif
414
415	# ifdef NeXT
416	# ifdef HAVE_MACH_MACH_H
417	# include <mach/mach.h>
418	# else
419	# include <mach.h>
420	# endif
421	# endif /* NeXT */
422
423	# ifdef sgi
424	# include <sys/sysmp.h>
425	# endif /* sgi */
426
427	# ifdef UMAX
428	# include <stdio.h>
429	# include <signal.h>
430	# include <sys/time.h>
431	# include <sys/wait.h>
432	# include <sys/syscall.h>
433
434	# ifdef UMAX_43
435	# include <machine/cpu.h>
436	# include <inq_stats/statistics.h>
437	# include <inq_stats/sysstats.h>
438	# include <inq_stats/cpustats.h>
439	# include <inq_stats/procstats.h>
440	# else /* Not UMAX_43. */
441	# include <sys/sysdefs.h>
442	# include <sys/statistics.h>
443	# include <sys/sysstats.h>
444	# include <sys/cpudefs.h>
445	# include <sys/cpustats.h>
446	# include <sys/procstats.h>
447	# endif /* Not UMAX_43. */
448	# endif /* UMAX */
449
450	# ifdef DGUX
451	# include <sys/dg_sys_info.h>
452	# endif
453
454	# if defined(HAVE_FCNTL_H) \|\| defined(_POSIX_VERSION)
455	# include <fcntl.h>
456	# else
457	# include <sys/file.h>
458	# endif
459
460
461
462	/* Avoid static vars inside a function since in HPUX they dump as pure. */
463
464	# ifdef NeXT
465	static processor_set_t default_set;
466	static int getloadavg_initialized;
467	# endif /* NeXT */
468
469	# ifdef UMAX
470	static unsigned int cpus = 0;
471	static unsigned int samples;
472	# endif /* UMAX */
473
474	# ifdef DGUX
475	static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
476	# endif /* DGUX */
477
478	#if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
479	/* File descriptor open to /dev/kmem or VMS load ave driver. */
480	static int channel;
481	/* Nonzero iff channel is valid. */
482	static int getloadavg_initialized;
483	/* Offset in kmem to seek to read load average, or 0 means invalid. */
484	static long offset;
485
486	#if !defined(VMS) && !defined(sgi) && !defined(__linux__)
487	static struct nlist nl[2];
488	#endif /* Not VMS or sgi */
489
490	#ifdef SUNOS_5
491	static kvm_t *kd;
492	#endif /* SUNOS_5 */
493
494	#endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
495
496
497	/* Put the 1 minute, 5 minute and 15 minute load averages
498	into the first NELEM elements of LOADAVG.
499	Return the number written (never more than 3, but may be less than NELEM),
500	or -1 if an error occurred. */
501
502	int
503	getloadavg (double loadavg[], int nelem)
504	{
505	int elem = 0; /* Return value. */
506
507	# ifdef NO_GET_LOAD_AVG
508	# define LDAV_DONE
509	/* Set errno to zero to indicate that there was no particular error;
510	this function just can't work at all on this system. */
511	errno = 0;
512	elem = -1;
513	# endif
514
515	# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
516	/* Use libkstat because we don't have to be root. */
517	# define LDAV_DONE
518	kstat_ctl_t *kc;
519	kstat_t *ksp;
520	kstat_named_t *kn;
521
522	kc = kstat_open ();
523	if (kc == 0)
524	return -1;
525	ksp = kstat_lookup (kc, "unix", 0, "system_misc");
526	if (ksp == 0 )
527	return -1;
528	if (kstat_read (kc, ksp, 0) == -1)
529	return -1;
530
531
532	kn = kstat_data_lookup (ksp, "avenrun_1min");
533	if (kn == 0)
534	{
535	/* Return -1 if no load average information is available. */
536	nelem = 0;
537	elem = -1;
538	}
539
540	if (nelem >= 1)
541	loadavg[elem++] = (double) kn->value.ul/FSCALE;
542
543	if (nelem >= 2)
544	{
545	kn = kstat_data_lookup (ksp, "avenrun_5min");
546	if (kn != 0)
547	{
548	loadavg[elem++] = (double) kn->value.ul/FSCALE;
549
550	if (nelem >= 3)
551	{
552	kn = kstat_data_lookup (ksp, "avenrun_15min");
553	if (kn != 0)
554	loadavg[elem++] = (double) kn->value.ul/FSCALE;
555	}
556	}
557	}
558
559	kstat_close (kc);
560	# endif /* HAVE_LIBKSTAT */
561
562	# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
563	/* Use pstat_getdynamic() because we don't have to be root. */
564	# define LDAV_DONE
565	# undef LOAD_AVE_TYPE
566
567	struct pst_dynamic dyn_info;
568	if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
569	return -1;
570	if (nelem > 0)
571	loadavg[elem++] = dyn_info.psd_avg_1_min;
572	if (nelem > 1)
573	loadavg[elem++] = dyn_info.psd_avg_5_min;
574	if (nelem > 2)
575	loadavg[elem++] = dyn_info.psd_avg_15_min;
576
577	# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
578
579	# if !defined (LDAV_DONE) && defined (__linux__)
580	# define LDAV_DONE
581	# undef LOAD_AVE_TYPE
582
583	# ifndef LINUX_LDAV_FILE
584	# define LINUX_LDAV_FILE "/proc/loadavg"
585	# endif
586
587	char ldavgbuf[40];
588	double load_ave[3];
589	int fd, count;
590
591	fd = open (LINUX_LDAV_FILE, O_RDONLY);
592	if (fd == -1)
593	return -1;
594	count = read (fd, ldavgbuf, 40);
595	(void) close (fd);
596	if (count <= 0)
597	return -1;
598
599	/* The following sscanf must use the C locale. */
600	setlocale (LC_NUMERIC, "C");
601	count = sscanf (ldavgbuf, "%lf %lf %lf",
602	&load_ave[0], &load_ave[1], &load_ave[2]);
603	setlocale (LC_NUMERIC, "");
604	if (count < 1)
605	return -1;
606
607	for (elem = 0; elem < nelem && elem < count; elem++)
608	loadavg[elem] = load_ave[elem];
609
610	return elem;
611
612	# endif /* __linux__ */
613
614	# if !defined (LDAV_DONE) && defined (__NetBSD__)
615	# define LDAV_DONE
616	# undef LOAD_AVE_TYPE
617
618	# ifndef NETBSD_LDAV_FILE
619	# define NETBSD_LDAV_FILE "/kern/loadavg"
620	# endif
621
622	unsigned long int load_ave[3], scale;
623	int count;
624	FILE *fp;
625
626	fp = fopen (NETBSD_LDAV_FILE, "r");
627	if (fp == NULL)
628	return -1;
629	count = fscanf (fp, "%lu %lu %lu %lu\n",
630	&load_ave[0], &load_ave[1], &load_ave[2],
631	&scale);
632	(void) fclose (fp);
633	if (count != 4)
634	return -1;
635
636	for (elem = 0; elem < nelem; elem++)
637	loadavg[elem] = (double) load_ave[elem] / (double) scale;
638
639	return elem;
640
641	# endif /* __NetBSD__ */
642
643	# if !defined (LDAV_DONE) && defined (NeXT)
644	# define LDAV_DONE
645	/* The NeXT code was adapted from iscreen 3.2. */
646
647	host_t host;
648	struct processor_set_basic_info info;
649	unsigned info_count;
650
651	/* We only know how to get the 1-minute average for this system,
652	so even if the caller asks for more than 1, we only return 1. */
653
654	if (!getloadavg_initialized)
655	{
656	if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
657	getloadavg_initialized = 1;
658	}
659
660	if (getloadavg_initialized)
661	{
662	info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
663	if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
664	(processor_set_info_t) &info, &info_count)
665	!= KERN_SUCCESS)
666	getloadavg_initialized = 0;
667	else
668	{
669	if (nelem > 0)
670	loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
671	}
672	}
673
674	if (!getloadavg_initialized)
675	return -1;
676	# endif /* NeXT */
677
678	# if !defined (LDAV_DONE) && defined (UMAX)
679	# define LDAV_DONE
680	/* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
681	have a /dev/kmem. Information about the workings of the running kernel
682	can be gathered with inq_stats system calls.
683	We only know how to get the 1-minute average for this system. */
684
685	struct proc_summary proc_sum_data;
686	struct stat_descr proc_info;
687	double load;
688	register unsigned int i, j;
689
690	if (cpus == 0)
691	{
692	register unsigned int c, i;
693	struct cpu_config conf;
694	struct stat_descr desc;
695
696	desc.sd_next = 0;
697	desc.sd_subsys = SUBSYS_CPU;
698	desc.sd_type = CPUTYPE_CONFIG;
699	desc.sd_addr = (char *) &conf;
700	desc.sd_size = sizeof conf;
701
702	if (inq_stats (1, &desc))
703	return -1;
704
705	c = 0;
706	for (i = 0; i < conf.config_maxclass; ++i)
707	{
708	struct class_stats stats;
709	bzero ((char *) &stats, sizeof stats);
710
711	desc.sd_type = CPUTYPE_CLASS;
712	desc.sd_objid = i;
713	desc.sd_addr = (char *) &stats;
714	desc.sd_size = sizeof stats;
715
716	if (inq_stats (1, &desc))
717	return -1;
718
719	c += stats.class_numcpus;
720	}
721	cpus = c;
722	samples = cpus < 2 ? 3 : (2 * cpus / 3);
723	}
724
725	proc_info.sd_next = 0;
726	proc_info.sd_subsys = SUBSYS_PROC;
727	proc_info.sd_type = PROCTYPE_SUMMARY;
728	proc_info.sd_addr = (char *) &proc_sum_data;
729	proc_info.sd_size = sizeof (struct proc_summary);
730	proc_info.sd_sizeused = 0;
731
732	if (inq_stats (1, &proc_info) != 0)
733	return -1;
734
735	load = proc_sum_data.ps_nrunnable;
736	j = 0;
737	for (i = samples - 1; i > 0; --i)
738	{
739	load += proc_sum_data.ps_nrun[j];
740	if (j++ == PS_NRUNSIZE)
741	j = 0;
742	}
743
744	if (nelem > 0)
745	loadavg[elem++] = load / samples / cpus;
746	# endif /* UMAX */
747
748	# if !defined (LDAV_DONE) && defined (DGUX)
749	# define LDAV_DONE
750	/* This call can return -1 for an error, but with good args
751	it's not supposed to fail. The first argument is for no
752	apparent reason of type `long int '. /
753	dg_sys_info ((long int *) &load_info,
754	DG_SYS_INFO_LOAD_INFO_TYPE,
755	DG_SYS_INFO_LOAD_VERSION_0);
756
757	if (nelem > 0)
758	loadavg[elem++] = load_info.one_minute;
759	if (nelem > 1)
760	loadavg[elem++] = load_info.five_minute;
761	if (nelem > 2)
762	loadavg[elem++] = load_info.fifteen_minute;
763	# endif /* DGUX */
764
765	# if !defined (LDAV_DONE) && defined (apollo)
766	# define LDAV_DONE
767	/* Apollo code from [email protected] (Ray Lischner).
768
769	This system call is not documented. The load average is obtained as
770	three long integers, for the load average over the past minute,
771	five minutes, and fifteen minutes. Each value is a scaled integer,
772	with 16 bits of integer part and 16 bits of fraction part.
773
774	I'm not sure which operating system first supported this system call,
775	but I know that SR10.2 supports it. */
776
777	extern void proc1_$get_loadav ();
778	unsigned long load_ave[3];
779
780	proc1_$get_loadav (load_ave);
781
782	if (nelem > 0)
783	loadavg[elem++] = load_ave[0] / 65536.0;
784	if (nelem > 1)
785	loadavg[elem++] = load_ave[1] / 65536.0;
786	if (nelem > 2)
787	loadavg[elem++] = load_ave[2] / 65536.0;
788	# endif /* apollo */
789
790	# if !defined (LDAV_DONE) && defined (OSF_MIPS)
791	# define LDAV_DONE
792
793	struct tbl_loadavg load_ave;
794	table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
795	loadavg[elem++]
796	= (load_ave.tl_lscale == 0
797	? load_ave.tl_avenrun.d[0]
798	: (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
799	# endif /* OSF_MIPS */
800
801	# if !defined (LDAV_DONE) && (defined (__MSDOS__) \|\| defined (WINDOWS32))
802	# define LDAV_DONE
803
804	/* A faithful emulation is going to have to be saved for a rainy day. */
805	for ( ; elem < nelem; elem++)
806	{
807	loadavg[elem] = 0.0;
808	}
809	# endif /* __MSDOS__ \|\| WINDOWS32 */
810
811	# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
812	# define LDAV_DONE
813
814	struct tbl_loadavg load_ave;
815	table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
816	for (elem = 0; elem < nelem; elem++)
817	loadavg[elem]
818	= (load_ave.tl_lscale == 0
819	? load_ave.tl_avenrun.d[elem]
820	: (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
821	# endif /* OSF_ALPHA */
822
823	# if !defined (LDAV_DONE) && defined (VMS)
824	/* VMS specific code -- read from the Load Ave driver. */
825
826	LOAD_AVE_TYPE load_ave[3];
827	static int getloadavg_initialized = 0;
828	# ifdef eunice
829	struct
830	{
831	int dsc$w_length;
832	char *dsc$a_pointer;
833	} descriptor;
834	# endif
835
836	/* Ensure that there is a channel open to the load ave device. */
837	if (!getloadavg_initialized)
838	{
839	/* Attempt to open the channel. */
840	# ifdef eunice
841	descriptor.dsc$w_length = 18;
842	descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
843	# else
844	$DESCRIPTOR (descriptor, "LAV0:");
845	# endif
846	if (sys$assign (&descriptor, &channel, 0, 0) & 1)
847	getloadavg_initialized = 1;
848	}
849
850	/* Read the load average vector. */
851	if (getloadavg_initialized
852	&& !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
853	load_ave, 12, 0, 0, 0, 0) & 1))
854	{
855	sys$dassgn (channel);
856	getloadavg_initialized = 0;
857	}
858
859	if (!getloadavg_initialized)
860	return -1;
861	# endif /* VMS */
862
863	# if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
864
865	/* UNIX-specific code -- read the average from /dev/kmem. */
866
867	# define LDAV_PRIVILEGED /* This code requires special installation. */
868
869	LOAD_AVE_TYPE load_ave[3];
870
871	/* Get the address of LDAV_SYMBOL. */
872	if (offset == 0)
873	{
874	# ifndef sgi
875	# ifndef NLIST_STRUCT
876	strcpy (nl[0].n_name, LDAV_SYMBOL);
877	strcpy (nl[1].n_name, "");
878	# else /* NLIST_STRUCT */
879	# ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
880	nl[0].n_un.n_name = LDAV_SYMBOL;
881	nl[1].n_un.n_name = 0;
882	# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
883	nl[0].n_name = LDAV_SYMBOL;
884	nl[1].n_name = 0;
885	# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
886	# endif /* NLIST_STRUCT */
887
888	# ifndef SUNOS_5
889	if (
890	# if !(defined (_AIX) && !defined (ps2))
891	nlist (KERNEL_FILE, nl)
892	# else /* _AIX */
893	knlist (nl, 1, sizeof (nl[0]))
894	# endif
895	>= 0)
896	/* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
897	{
898	# ifdef FIXUP_KERNEL_SYMBOL_ADDR
899	FIXUP_KERNEL_SYMBOL_ADDR (nl);
900	# endif
901	offset = nl[0].n_value;
902	}
903	# endif /* !SUNOS_5 */
904	# else /* sgi */
905	int ldav_off;
906
907	ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
908	if (ldav_off != -1)
909	offset = (long) ldav_off & 0x7fffffff;
910	# endif /* sgi */
911	}
912
913	/* Make sure we have /dev/kmem open. */
914	if (!getloadavg_initialized)
915	{
916	# ifndef SUNOS_5
917	channel = open ("/dev/kmem", 0);
918	if (channel >= 0)
919	{
920	/* Set the channel to close on exec, so it does not
921	litter any child's descriptor table. */
922	# ifdef F_SETFD
923	# ifndef FD_CLOEXEC
924	# define FD_CLOEXEC 1
925	# endif
926	(void) fcntl (channel, F_SETFD, FD_CLOEXEC);
927	# endif
928	getloadavg_initialized = 1;
929	}
930	# else /* SUNOS_5 */
931	/* We pass 0 for the kernel, corefile, and swapfile names
932	to use the currently running kernel. */
933	kd = kvm_open (0, 0, 0, O_RDONLY, 0);
934	if (kd != 0)
935	{
936	/* nlist the currently running kernel. */
937	kvm_nlist (kd, nl);
938	offset = nl[0].n_value;
939	getloadavg_initialized = 1;
940	}
941	# endif /* SUNOS_5 */
942	}
943
944	/* If we can, get the load average values. */
945	if (offset && getloadavg_initialized)
946	{
947	/* Try to read the load. */
948	# ifndef SUNOS_5
949	if (lseek (channel, offset, 0) == -1L
950	\|\| read (channel, (char *) load_ave, sizeof (load_ave))
951	!= sizeof (load_ave))
952	{
953	close (channel);
954	getloadavg_initialized = 0;
955	}
956	# else /* SUNOS_5 */
957	if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
958	!= sizeof (load_ave))
959	{
960	kvm_close (kd);
961	getloadavg_initialized = 0;
962	}
963	# endif /* SUNOS_5 */
964	}
965
966	if (offset == 0 \|\| !getloadavg_initialized)
967	return -1;
968	# endif /* LOAD_AVE_TYPE and not VMS */
969
970	# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
971	if (nelem > 0)
972	loadavg[elem++] = LDAV_CVT (load_ave[0]);
973	if (nelem > 1)
974	loadavg[elem++] = LDAV_CVT (load_ave[1]);
975	if (nelem > 2)
976	loadavg[elem++] = LDAV_CVT (load_ave[2]);
977
978	# define LDAV_DONE
979	# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
980
981	# ifdef LDAV_DONE
982	return elem;
983	# else
984	/* Set errno to zero to indicate that there was no particular error;
985	this function just can't work at all on this system. */
986	errno = 0;
987	return -1;
988	# endif
989	}
990
991	#endif /* ! HAVE_GETLOADAVG */
992
993
994	#ifdef TEST
995	#include "make.h"
996
997	int
998	main (int argc, char **argv)
999	{
1000	int naptime = 0;
1001
1002	if (argc > 1)
1003	naptime = atoi (argv[1]);
1004
1005	while (1)
1006	{
1007	double avg[3];
1008	int loads;
1009
1010	errno = 0; /* Don't be misled if it doesn't set errno. */
1011	loads = getloadavg (avg, 3);
1012	if (loads == -1)
1013	{
1014	perror ("Error getting load average");
1015	exit (1);
1016	}
1017	if (loads > 0)
1018	printf ("1-minute: %f ", avg[0]);
1019	if (loads > 1)
1020	printf ("5-minute: %f ", avg[1]);
1021	if (loads > 2)
1022	printf ("15-minute: %f ", avg[2]);
1023	if (loads > 0)
1024	putchar ('\n');
1025
1026	if (naptime == 0)
1027	break;
1028	sleep (naptime);
1029	}
1030
1031	exit (0);
1032	}
1033	#endif /* TEST */

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source: kBuild/trunk/src/gmake/getloadavg.c@ 281

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