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