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 Free
4 Software Foundation, Inc.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License along with
17 this program; see the file COPYING. If not, write to the Free Software
18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 ghazi@noc.rutgers.edu. */
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 ghazi@noc.rutgers.edu. */
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 /* Avoid static vars inside a function since in HPUX they dump as pure. */
462
463 # ifdef NeXT
464 static processor_set_t default_set;
465 static int getloadavg_initialized;
466 # endif /* NeXT */
467
468 # ifdef UMAX
469 static unsigned int cpus = 0;
470 static unsigned int samples;
471 # endif /* UMAX */
472
473 # ifdef DGUX
474 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
475 # endif /* DGUX */
476
477 #if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
478 /* File descriptor open to /dev/kmem or VMS load ave driver. */
479 static int channel;
480 /* Nonzero iff channel is valid. */
481 static int getloadavg_initialized;
482 /* Offset in kmem to seek to read load average, or 0 means invalid. */
483 static long offset;
484
485 #if !defined(VMS) && !defined(sgi) && !defined(__linux__)
486 static struct nlist nl[2];
487 #endif /* Not VMS or sgi */
488
489 #ifdef SUNOS_5
490 static kvm_t *kd;
491 #endif /* SUNOS_5 */
492
493 #endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
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
getloadavg(double loadavg[],int nelem)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 bzero ((char *) &stats, 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 #ifdef TEST
992 #include "make.h"
993
994 int
main(int argc,char ** argv)995 main (int argc, char **argv)
996 {
997 int naptime = 0;
998
999 if (argc > 1)
1000 naptime = atoi (argv[1]);
1001
1002 while (1)
1003 {
1004 double avg[3];
1005 int loads;
1006
1007 errno = 0; /* Don't be misled if it doesn't set errno. */
1008 loads = getloadavg (avg, 3);
1009 if (loads == -1)
1010 {
1011 perror ("Error getting load average");
1012 exit (1);
1013 }
1014 if (loads > 0)
1015 printf ("1-minute: %f ", avg[0]);
1016 if (loads > 1)
1017 printf ("5-minute: %f ", avg[1]);
1018 if (loads > 2)
1019 printf ("15-minute: %f ", avg[2]);
1020 if (loads > 0)
1021 putchar ('\n');
1022
1023 if (naptime == 0)
1024 break;
1025 sleep (naptime);
1026 }
1027
1028 exit (0);
1029 }
1030 #endif /* TEST */
1031