1 /* Get the system load averages.
3 Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994,
4 1995, 1997, 1999, 2000, 2003, 2004 Free Software Foundation, Inc.
6 NOTE: The canonical source of this file is maintained with gnulib.
7 Bugs can be reported to bug-gnulib@gnu.org.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
12 any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
22 USA. */
24 /* Compile-time symbols that this file uses:
26 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
27 pstat_getdynamic function. I think it
28 is unique to HPUX9. The best way to get the
29 definition is through the AC_FUNC_GETLOADAVG
30 macro that comes with autoconf 2.13 or newer.
31 If that isn't an option, then just put
32 AC_CHECK_FUNCS(pstat_getdynamic) in your
33 configure.in file.
34 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
35 KERNEL_FILE Pathname of the kernel to nlist.
36 LDAV_CVT() Scale the load average from the kernel.
37 Returns a double.
38 LDAV_SYMBOL Name of kernel symbol giving load average.
39 LOAD_AVE_TYPE Type of the load average array in the kernel.
40 Must be defined unless one of
41 apollo, DGUX, NeXT, or UMAX is defined;
42 or we have libkstat;
43 otherwise, no load average is available.
44 HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults
45 to this.
46 NLIST_STRUCT Include nlist.h, not a.out.h, and
47 the nlist n_name element is a pointer,
48 not an array.
49 HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'.
50 LINUX_LDAV_FILE [__linux__]: File containing load averages.
51 HAVE_LOCALE_H locale.h is available.
52 HAVE_SETLOCALE The `setlocale' function is available.
54 Specific system predefines this file uses, aside from setting
55 default values if not emacs:
57 apollo
58 BSD Real BSD, not just BSD-like.
59 convex
60 DGUX
61 eunice UNIX emulator under VMS.
62 hpux
63 __MSDOS__ No-op for MSDOS.
64 NeXT
65 sgi
66 sequent Sequent Dynix 3.x.x (BSD)
67 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
68 sony_news NEWS-OS (works at least for 4.1C)
69 UMAX
70 UMAX4_3
71 VMS
72 WINDOWS32 No-op for Windows95/NT.
73 __linux__ Linux: assumes /proc filesystem mounted.
74 Support from Michael K. Johnson.
75 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
77 In addition, to avoid nesting many #ifdefs, we internally set
78 LDAV_DONE to indicate that the load average has been computed.
80 We also #define LDAV_PRIVILEGED if a program will require
81 special installation to be able to call getloadavg. */
83 /* This should always be first. */
84 #ifdef HAVE_CONFIG_H
85 # include <config.h>
86 #endif
88 #include <sys/types.h>
90 /* Both the Emacs and non-Emacs sections want this. Some
91 configuration files' definitions for the LOAD_AVE_CVT macro (like
92 sparc.h's) use macros like FSCALE, defined here. */
93 #if defined (unix) || defined (__unix)
94 # include <sys/param.h>
95 #endif
98 /* Exclude all the code except the test program at the end
99 if the system has its own `getloadavg' function.
101 The declaration of `errno' is needed by the test program
102 as well as the function itself, so it comes first. */
104 #include <errno.h>
106 #ifndef errno
107 extern int errno;
108 #endif
110 #ifdef HAVE_LOCALE_H
111 # include <locale.h>
112 #endif
113 #ifndef HAVE_SETLOCALE
114 # define setlocale(Category, Locale) /* empty */
115 #endif
117 #include "cloexec.h"
119 #ifndef HAVE_GETLOADAVG
121 /* The existing Emacs configuration files define a macro called
122 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
123 returns the load average multiplied by 100. What we actually want
124 is a macro called LDAV_CVT, which returns the load average as an
125 unmultiplied double.
127 For backwards compatibility, we'll define LDAV_CVT in terms of
128 LOAD_AVE_CVT, but future machine config files should just define
129 LDAV_CVT directly. */
131 # if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT)
132 # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
133 # endif
135 # if !defined (BSD) && defined (ultrix)
136 /* Ultrix behaves like BSD on Vaxen. */
137 # define BSD
138 # endif
140 # ifdef NeXT
141 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
142 conflicts with the definition understood in this file, that this
143 really is BSD. */
144 # undef BSD
146 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
147 defined to mean that the nlist method should be used, which is not true. */
148 # undef FSCALE
149 # endif
151 /* Same issues as for NeXT apply to the HURD-based GNU system. */
152 # ifdef __GNU__
153 # undef BSD
154 # undef FSCALE
155 # endif /* __GNU__ */
157 /* Set values that are different from the defaults, which are
158 set a little farther down with #ifndef. */
161 /* Some shorthands. */
163 # if defined (HPUX) && !defined (hpux)
164 # define hpux
165 # endif
167 # if defined (__hpux) && !defined (hpux)
168 # define hpux
169 # endif
171 # if defined (__sun) && !defined (sun)
172 # define sun
173 # endif
175 # if defined (hp300) && !defined (hpux)
176 # define MORE_BSD
177 # endif
179 # if defined (ultrix) && defined (mips)
180 # define decstation
181 # endif
183 # if defined (__SVR4) && !defined (SVR4)
184 # define SVR4
185 # endif
187 # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2)
188 # define SUNOS_5
189 # endif
191 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
192 # define OSF_ALPHA
193 # include <sys/mbuf.h>
194 # include <sys/socket.h>
195 # include <net/route.h>
196 # include <sys/table.h>
197 # endif
199 # if defined (__osf__) && (defined (mips) || defined (__mips__))
200 # define OSF_MIPS
201 # include <sys/table.h>
202 # endif
204 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
205 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
206 that with a couple of other things and we'll have a unique match. */
207 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
208 # define tek4300 /* Define by emacs, but not by other users. */
209 # endif
212 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
213 # ifndef LOAD_AVE_TYPE
215 # ifdef MORE_BSD
216 # define LOAD_AVE_TYPE long
217 # endif
219 # ifdef sun
220 # define LOAD_AVE_TYPE long
221 # endif
223 # ifdef decstation
224 # define LOAD_AVE_TYPE long
225 # endif
227 # ifdef _SEQUENT_
228 # define LOAD_AVE_TYPE long
229 # endif
231 # ifdef sgi
232 # define LOAD_AVE_TYPE long
233 # endif
235 # ifdef SVR4
236 # define LOAD_AVE_TYPE long
237 # endif
239 # ifdef sony_news
240 # define LOAD_AVE_TYPE long
241 # endif
243 # ifdef sequent
244 # define LOAD_AVE_TYPE long
245 # endif
247 # ifdef OSF_ALPHA
248 # define LOAD_AVE_TYPE long
249 # endif
251 # if defined (ardent) && defined (titan)
252 # define LOAD_AVE_TYPE long
253 # endif
255 # ifdef tek4300
256 # define LOAD_AVE_TYPE long
257 # endif
259 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */
260 # define LOAD_AVE_TYPE long
261 # endif
263 # ifdef _AIX
264 # define LOAD_AVE_TYPE long
265 # endif
267 # ifdef convex
268 # define LOAD_AVE_TYPE double
269 # ifndef LDAV_CVT
270 # define LDAV_CVT(n) (n)
271 # endif
272 # endif
274 # endif /* No LOAD_AVE_TYPE. */
276 # ifdef OSF_ALPHA
277 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
278 according to ghazi@noc.rutgers.edu. */
279 # undef FSCALE
280 # define FSCALE 1024.0
281 # endif
283 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */
284 /* <sys/param.h> defines an incorrect value for FSCALE on an
285 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
286 # undef FSCALE
287 # define FSCALE 100.0
288 # endif
291 # ifndef FSCALE
293 /* SunOS and some others define FSCALE in sys/param.h. */
295 # ifdef MORE_BSD
296 # define FSCALE 2048.0
297 # endif
299 # if defined (MIPS) || defined (SVR4) || defined (decstation)
300 # define FSCALE 256
301 # endif
303 # if defined (sgi) || defined (sequent)
304 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
305 above under #ifdef MIPS. But we want the sgi value. */
306 # undef FSCALE
307 # define FSCALE 1000.0
308 # endif
310 # if defined (ardent) && defined (titan)
311 # define FSCALE 65536.0
312 # endif
314 # ifdef tek4300
315 # define FSCALE 100.0
316 # endif
318 # ifdef _AIX
319 # define FSCALE 65536.0
320 # endif
322 # endif /* Not FSCALE. */
324 # if !defined (LDAV_CVT) && defined (FSCALE)
325 # define LDAV_CVT(n) (((double) (n)) / FSCALE)
326 # endif
328 # ifndef NLIST_STRUCT
329 # if HAVE_NLIST_H
330 # define NLIST_STRUCT
331 # endif
332 # endif
334 # if defined (sgi) || (defined (mips) && !defined (BSD))
335 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
336 # endif
339 # if !defined (KERNEL_FILE) && defined (sequent)
340 # define KERNEL_FILE "/dynix"
341 # endif
343 # if !defined (KERNEL_FILE) && defined (hpux)
344 # define KERNEL_FILE "/hp-ux"
345 # endif
347 # if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
348 # define KERNEL_FILE "/unix"
349 # endif
352 # if !defined (LDAV_SYMBOL) && defined (alliant)
353 # define LDAV_SYMBOL "_Loadavg"
354 # endif
356 # if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
357 # define LDAV_SYMBOL "avenrun"
358 # endif
360 # ifdef HAVE_UNISTD_H
361 # include <unistd.h>
362 # endif
364 # include <stdio.h>
366 /* LOAD_AVE_TYPE should only get defined if we're going to use the
367 nlist method. */
368 # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL))
369 # define LOAD_AVE_TYPE double
370 # endif
372 # ifdef LOAD_AVE_TYPE
374 # ifndef VMS
375 # ifndef __linux__
376 # ifndef NLIST_STRUCT
377 # include <a.out.h>
378 # else /* NLIST_STRUCT */
379 # include <nlist.h>
380 # endif /* NLIST_STRUCT */
382 # ifdef SUNOS_5
383 # include <fcntl.h>
384 # include <kvm.h>
385 # include <kstat.h>
386 # endif
388 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
389 # include <sys/pstat.h>
390 # endif
392 # ifndef KERNEL_FILE
393 # define KERNEL_FILE "/vmunix"
394 # endif /* KERNEL_FILE */
396 # ifndef LDAV_SYMBOL
397 # define LDAV_SYMBOL "_avenrun"
398 # endif /* LDAV_SYMBOL */
399 # endif /* __linux__ */
401 # else /* VMS */
403 # ifndef eunice
404 # include <iodef.h>
405 # include <descrip.h>
406 # else /* eunice */
407 # include <vms/iodef.h>
408 # endif /* eunice */
409 # endif /* VMS */
411 # ifndef LDAV_CVT
412 # define LDAV_CVT(n) ((double) (n))
413 # endif /* !LDAV_CVT */
415 # endif /* LOAD_AVE_TYPE */
417 # if defined (__GNU__) && !defined (NeXT)
418 /* Note that NeXT Openstep defines __GNU__ even though it should not. */
419 /* GNU system acts much like NeXT, for load average purposes,
420 but not exactly. */
421 # define NeXT
422 # define host_self mach_host_self
423 # endif
425 # ifdef NeXT
426 # ifdef HAVE_MACH_MACH_H
427 # include <mach/mach.h>
428 # else
429 # include <mach.h>
430 # endif
431 # endif /* NeXT */
433 # ifdef sgi
434 # include <sys/sysmp.h>
435 # endif /* sgi */
437 # ifdef UMAX
438 # include <stdio.h>
439 # include <signal.h>
440 # include <sys/time.h>
441 # include <sys/wait.h>
442 # include <sys/syscall.h>
444 # ifdef UMAX_43
445 # include <machine/cpu.h>
446 # include <inq_stats/statistics.h>
447 # include <inq_stats/sysstats.h>
448 # include <inq_stats/cpustats.h>
449 # include <inq_stats/procstats.h>
450 # else /* Not UMAX_43. */
451 # include <sys/sysdefs.h>
452 # include <sys/statistics.h>
453 # include <sys/sysstats.h>
454 # include <sys/cpudefs.h>
455 # include <sys/cpustats.h>
456 # include <sys/procstats.h>
457 # endif /* Not UMAX_43. */
458 # endif /* UMAX */
460 # ifdef DGUX
461 # include <sys/dg_sys_info.h>
462 # endif
464 # if defined (HAVE_FCNTL_H) || defined (_POSIX_VERSION)
465 # include <fcntl.h>
466 # else
467 # include <sys/file.h>
468 # endif
469 \f
470 /* Avoid static vars inside a function since in HPUX they dump as pure. */
472 # ifdef NeXT
473 static processor_set_t default_set;
474 static int getloadavg_initialized;
475 # endif /* NeXT */
477 # ifdef UMAX
478 static unsigned int cpus = 0;
479 static unsigned int samples;
480 # endif /* UMAX */
482 # ifdef DGUX
483 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
484 # endif /* DGUX */
486 # if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE)
487 /* File descriptor open to /dev/kmem or VMS load ave driver. */
488 static int channel;
489 /* Nonzero iff channel is valid. */
490 static int getloadavg_initialized;
491 /* Offset in kmem to seek to read load average, or 0 means invalid. */
492 static long offset;
494 # if !defined (VMS) && !defined (sgi) && !defined (__linux__)
495 static struct nlist nl[2];
496 # endif /* Not VMS or sgi */
498 # ifdef SUNOS_5
499 static kvm_t *kd;
500 # endif /* SUNOS_5 */
502 # endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
503 \f
504 /* Put the 1 minute, 5 minute and 15 minute load averages
505 into the first NELEM elements of LOADAVG.
506 Return the number written (never more than 3, but may be less than NELEM),
507 or -1 if an error occurred. */
509 int
510 getloadavg (double loadavg[], int nelem)
511 {
512 int elem = 0; /* Return value. */
514 # ifdef NO_GET_LOAD_AVG
515 # define LDAV_DONE
516 /* Set errno to zero to indicate that there was no particular error;
517 this function just can't work at all on this system. */
518 errno = 0;
519 elem = -1;
520 # endif
522 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
523 /* Use libkstat because we don't have to be root. */
524 # define LDAV_DONE
525 kstat_ctl_t *kc;
526 kstat_t *ksp;
527 kstat_named_t *kn;
529 kc = kstat_open ();
530 if (kc == 0)
531 return -1;
532 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
533 if (ksp == 0)
534 return -1;
535 if (kstat_read (kc, ksp, 0) == -1)
536 return -1;
539 kn = kstat_data_lookup (ksp, "avenrun_1min");
540 if (kn == 0)
541 {
542 /* Return -1 if no load average information is available. */
543 nelem = 0;
544 elem = -1;
545 }
547 if (nelem >= 1)
548 loadavg[elem++] = (double) kn->value.ul / FSCALE;
550 if (nelem >= 2)
551 {
552 kn = kstat_data_lookup (ksp, "avenrun_5min");
553 if (kn != 0)
554 {
555 loadavg[elem++] = (double) kn->value.ul / FSCALE;
557 if (nelem >= 3)
558 {
559 kn = kstat_data_lookup (ksp, "avenrun_15min");
560 if (kn != 0)
561 loadavg[elem++] = (double) kn->value.ul / FSCALE;
562 }
563 }
564 }
566 kstat_close (kc);
567 # endif /* HAVE_LIBKSTAT */
569 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
570 /* Use pstat_getdynamic() because we don't have to be root. */
571 # define LDAV_DONE
572 # undef LOAD_AVE_TYPE
574 struct pst_dynamic dyn_info;
575 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
576 return -1;
577 if (nelem > 0)
578 loadavg[elem++] = dyn_info.psd_avg_1_min;
579 if (nelem > 1)
580 loadavg[elem++] = dyn_info.psd_avg_5_min;
581 if (nelem > 2)
582 loadavg[elem++] = dyn_info.psd_avg_15_min;
584 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
586 # if !defined (LDAV_DONE) && defined (__linux__)
587 # define LDAV_DONE
588 # undef LOAD_AVE_TYPE
590 # ifndef LINUX_LDAV_FILE
591 # define LINUX_LDAV_FILE "/proc/loadavg"
592 # endif
594 char ldavgbuf[40];
595 double load_ave[3];
596 int fd, count;
598 fd = open (LINUX_LDAV_FILE, O_RDONLY);
599 if (fd == -1)
600 return -1;
601 count = read (fd, ldavgbuf, 40);
602 (void) close (fd);
603 if (count <= 0)
604 return -1;
606 /* The following sscanf must use the C locale. */
607 setlocale (LC_NUMERIC, "C");
608 count = sscanf (ldavgbuf, "%lf %lf %lf",
609 &load_ave[0], &load_ave[1], &load_ave[2]);
610 setlocale (LC_NUMERIC, "");
611 if (count < 1)
612 return -1;
614 for (elem = 0; elem < nelem && elem < count; elem++)
615 loadavg[elem] = load_ave[elem];
617 return elem;
619 # endif /* __linux__ */
621 # if !defined (LDAV_DONE) && defined (__NetBSD__)
622 # define LDAV_DONE
623 # undef LOAD_AVE_TYPE
625 # ifndef NETBSD_LDAV_FILE
626 # define NETBSD_LDAV_FILE "/kern/loadavg"
627 # endif
629 unsigned long int load_ave[3], scale;
630 int count;
631 FILE *fp;
633 fp = fopen (NETBSD_LDAV_FILE, "r");
634 if (fp == NULL)
635 return -1;
636 count = fscanf (fp, "%lu %lu %lu %lu\n",
637 &load_ave[0], &load_ave[1], &load_ave[2],
638 &scale);
639 (void) fclose (fp);
640 if (count != 4)
641 return -1;
643 for (elem = 0; elem < nelem; elem++)
644 loadavg[elem] = (double) load_ave[elem] / (double) scale;
646 return elem;
648 # endif /* __NetBSD__ */
650 # if !defined (LDAV_DONE) && defined (NeXT)
651 # define LDAV_DONE
652 /* The NeXT code was adapted from iscreen 3.2. */
654 host_t host;
655 struct processor_set_basic_info info;
656 unsigned info_count;
658 /* We only know how to get the 1-minute average for this system,
659 so even if the caller asks for more than 1, we only return 1. */
661 if (!getloadavg_initialized)
662 {
663 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
664 getloadavg_initialized = 1;
665 }
667 if (getloadavg_initialized)
668 {
669 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
670 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
671 (processor_set_info_t) &info, &info_count)
672 != KERN_SUCCESS)
673 getloadavg_initialized = 0;
674 else
675 {
676 if (nelem > 0)
677 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
678 }
679 }
681 if (!getloadavg_initialized)
682 return -1;
683 # endif /* NeXT */
685 # if !defined (LDAV_DONE) && defined (UMAX)
686 # define LDAV_DONE
687 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
688 have a /dev/kmem. Information about the workings of the running kernel
689 can be gathered with inq_stats system calls.
690 We only know how to get the 1-minute average for this system. */
692 struct proc_summary proc_sum_data;
693 struct stat_descr proc_info;
694 double load;
695 register unsigned int i, j;
697 if (cpus == 0)
698 {
699 register unsigned int c, i;
700 struct cpu_config conf;
701 struct stat_descr desc;
703 desc.sd_next = 0;
704 desc.sd_subsys = SUBSYS_CPU;
705 desc.sd_type = CPUTYPE_CONFIG;
706 desc.sd_addr = (char *) &conf;
707 desc.sd_size = sizeof conf;
709 if (inq_stats (1, &desc))
710 return -1;
712 c = 0;
713 for (i = 0; i < conf.config_maxclass; ++i)
714 {
715 struct class_stats stats;
716 bzero ((char *) &stats, sizeof stats);
718 desc.sd_type = CPUTYPE_CLASS;
719 desc.sd_objid = i;
720 desc.sd_addr = (char *) &stats;
721 desc.sd_size = sizeof stats;
723 if (inq_stats (1, &desc))
724 return -1;
726 c += stats.class_numcpus;
727 }
728 cpus = c;
729 samples = cpus < 2 ? 3 : (2 * cpus / 3);
730 }
732 proc_info.sd_next = 0;
733 proc_info.sd_subsys = SUBSYS_PROC;
734 proc_info.sd_type = PROCTYPE_SUMMARY;
735 proc_info.sd_addr = (char *) &proc_sum_data;
736 proc_info.sd_size = sizeof (struct proc_summary);
737 proc_info.sd_sizeused = 0;
739 if (inq_stats (1, &proc_info) != 0)
740 return -1;
742 load = proc_sum_data.ps_nrunnable;
743 j = 0;
744 for (i = samples - 1; i > 0; --i)
745 {
746 load += proc_sum_data.ps_nrun[j];
747 if (j++ == PS_NRUNSIZE)
748 j = 0;
749 }
751 if (nelem > 0)
752 loadavg[elem++] = load / samples / cpus;
753 # endif /* UMAX */
755 # if !defined (LDAV_DONE) && defined (DGUX)
756 # define LDAV_DONE
757 /* This call can return -1 for an error, but with good args
758 it's not supposed to fail. The first argument is for no
759 apparent reason of type `long int *'. */
760 dg_sys_info ((long int *) &load_info,
761 DG_SYS_INFO_LOAD_INFO_TYPE,
762 DG_SYS_INFO_LOAD_VERSION_0);
764 if (nelem > 0)
765 loadavg[elem++] = load_info.one_minute;
766 if (nelem > 1)
767 loadavg[elem++] = load_info.five_minute;
768 if (nelem > 2)
769 loadavg[elem++] = load_info.fifteen_minute;
770 # endif /* DGUX */
772 # if !defined (LDAV_DONE) && defined (apollo)
773 # define LDAV_DONE
774 /* Apollo code from lisch@mentorg.com (Ray Lischner).
776 This system call is not documented. The load average is obtained as
777 three long integers, for the load average over the past minute,
778 five minutes, and fifteen minutes. Each value is a scaled integer,
779 with 16 bits of integer part and 16 bits of fraction part.
781 I'm not sure which operating system first supported this system call,
782 but I know that SR10.2 supports it. */
784 extern void proc1_$get_loadav ();
785 unsigned long load_ave[3];
787 proc1_$get_loadav (load_ave);
789 if (nelem > 0)
790 loadavg[elem++] = load_ave[0] / 65536.0;
791 if (nelem > 1)
792 loadavg[elem++] = load_ave[1] / 65536.0;
793 if (nelem > 2)
794 loadavg[elem++] = load_ave[2] / 65536.0;
795 # endif /* apollo */
797 # if !defined (LDAV_DONE) && defined (OSF_MIPS)
798 # define LDAV_DONE
800 struct tbl_loadavg load_ave;
801 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
802 loadavg[elem++]
803 = (load_ave.tl_lscale == 0
804 ? load_ave.tl_avenrun.d[0]
805 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
806 # endif /* OSF_MIPS */
808 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
809 # define LDAV_DONE
811 /* A faithful emulation is going to have to be saved for a rainy day. */
812 for ( ; elem < nelem; elem++)
813 {
814 loadavg[elem] = 0.0;
815 }
816 # endif /* __MSDOS__ || WINDOWS32 */
818 # if !defined (LDAV_DONE) && defined (OSF_ALPHA)
819 # define LDAV_DONE
821 struct tbl_loadavg load_ave;
822 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
823 for (elem = 0; elem < nelem; elem++)
824 loadavg[elem]
825 = (load_ave.tl_lscale == 0
826 ? load_ave.tl_avenrun.d[elem]
827 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
828 # endif /* OSF_ALPHA */
830 # if !defined (LDAV_DONE) && defined (VMS)
831 /* VMS specific code -- read from the Load Ave driver. */
833 LOAD_AVE_TYPE load_ave[3];
834 static int getloadavg_initialized = 0;
835 # ifdef eunice
836 struct
837 {
838 int dsc$w_length;
839 char *dsc$a_pointer;
840 } descriptor;
841 # endif
843 /* Ensure that there is a channel open to the load ave device. */
844 if (!getloadavg_initialized)
845 {
846 /* Attempt to open the channel. */
847 # ifdef eunice
848 descriptor.dsc$w_length = 18;
849 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
850 # else
851 $DESCRIPTOR (descriptor, "LAV0:");
852 # endif
853 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
854 getloadavg_initialized = 1;
855 }
857 /* Read the load average vector. */
858 if (getloadavg_initialized
859 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
860 load_ave, 12, 0, 0, 0, 0) & 1))
861 {
862 sys$dassgn (channel);
863 getloadavg_initialized = 0;
864 }
866 if (!getloadavg_initialized)
867 return -1;
868 # endif /* VMS */
870 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) && !defined (VMS)
872 /* UNIX-specific code -- read the average from /dev/kmem. */
874 # define LDAV_PRIVILEGED /* This code requires special installation. */
876 LOAD_AVE_TYPE load_ave[3];
878 /* Get the address of LDAV_SYMBOL. */
879 if (offset == 0)
880 {
881 # ifndef sgi
882 # ifndef NLIST_STRUCT
883 strcpy (nl[0].n_name, LDAV_SYMBOL);
884 strcpy (nl[1].n_name, "");
885 # else /* NLIST_STRUCT */
886 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
887 nl[0].n_un.n_name = LDAV_SYMBOL;
888 nl[1].n_un.n_name = 0;
889 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
890 nl[0].n_name = LDAV_SYMBOL;
891 nl[1].n_name = 0;
892 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
893 # endif /* NLIST_STRUCT */
895 # ifndef SUNOS_5
896 if (
897 # if !(defined (_AIX) && !defined (ps2))
898 nlist (KERNEL_FILE, nl)
899 # else /* _AIX */
900 knlist (nl, 1, sizeof (nl[0]))
901 # endif
902 >= 0)
903 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
904 {
905 # ifdef FIXUP_KERNEL_SYMBOL_ADDR
906 FIXUP_KERNEL_SYMBOL_ADDR (nl);
907 # endif
908 offset = nl[0].n_value;
909 }
910 # endif /* !SUNOS_5 */
911 # else /* sgi */
912 int ldav_off;
914 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
915 if (ldav_off != -1)
916 offset = (long) ldav_off & 0x7fffffff;
917 # endif /* sgi */
918 }
920 /* Make sure we have /dev/kmem open. */
921 if (!getloadavg_initialized)
922 {
923 # ifndef SUNOS_5
924 channel = open ("/dev/kmem", 0);
925 if (channel >= 0)
926 {
927 /* Set the channel to close on exec, so it does not
928 litter any child's descriptor table. */
929 set_cloexec_flag (channel, true);
930 getloadavg_initialized = 1;
931 }
932 # else /* SUNOS_5 */
933 /* We pass 0 for the kernel, corefile, and swapfile names
934 to use the currently running kernel. */
935 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
936 if (kd != 0)
937 {
938 /* nlist the currently running kernel. */
939 kvm_nlist (kd, nl);
940 offset = nl[0].n_value;
941 getloadavg_initialized = 1;
942 }
943 # endif /* SUNOS_5 */
944 }
946 /* If we can, get the load average values. */
947 if (offset && getloadavg_initialized)
948 {
949 /* Try to read the load. */
950 # ifndef SUNOS_5
951 if (lseek (channel, offset, 0) == -1L
952 || read (channel, (char *) load_ave, sizeof (load_ave))
953 != sizeof (load_ave))
954 {
955 close (channel);
956 getloadavg_initialized = 0;
957 }
958 # else /* SUNOS_5 */
959 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
960 != sizeof (load_ave))
961 {
962 kvm_close (kd);
963 getloadavg_initialized = 0;
964 }
965 # endif /* SUNOS_5 */
966 }
968 if (offset == 0 || !getloadavg_initialized)
969 return -1;
970 # endif /* LOAD_AVE_TYPE and not VMS */
972 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
973 if (nelem > 0)
974 loadavg[elem++] = LDAV_CVT (load_ave[0]);
975 if (nelem > 1)
976 loadavg[elem++] = LDAV_CVT (load_ave[1]);
977 if (nelem > 2)
978 loadavg[elem++] = LDAV_CVT (load_ave[2]);
980 # define LDAV_DONE
981 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */
983 # ifdef LDAV_DONE
984 return elem;
985 # else
986 /* Set errno to zero to indicate that there was no particular error;
987 this function just can't work at all on this system. */
988 errno = 0;
989 return -1;
990 # endif
991 }
993 #endif /* ! HAVE_GETLOADAVG */
994 \f
995 #ifdef TEST
996 void
997 main (int argc, char **argv)
998 {
999 int naptime = 0;
1001 if (argc > 1)
1002 naptime = atoi (argv[1]);
1004 while (1)
1005 {
1006 double avg[3];
1007 int loads;
1009 errno = 0; /* Don't be misled if it doesn't set errno. */
1010 loads = getloadavg (avg, 3);
1011 if (loads == -1)
1012 {
1013 perror ("Error getting load average");
1014 exit (1);
1015 }
1016 if (loads > 0)
1017 printf ("1-minute: %f ", avg[0]);
1018 if (loads > 1)
1019 printf ("5-minute: %f ", avg[1]);
1020 if (loads > 2)
1021 printf ("15-minute: %f ", avg[2]);
1022 if (loads > 0)
1023 putchar ('\n');
1025 if (naptime == 0)
1026 break;
1027 sleep (naptime);
1028 }
1030 exit (0);
1031 }
1032 #endif /* TEST */