1 /* Get the system load averages.
3 Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2010 Free Software
4 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 3 of the License, or
12 (at your option) 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, see <http://www.gnu.org/licenses/>. */
22 /* Compile-time symbols that this file uses:
24 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
25 pstat_getdynamic function. I think it
26 is unique to HPUX9. The best way to get the
27 definition is through the AC_FUNC_GETLOADAVG
28 macro that comes with autoconf 2.13 or newer.
29 If that isn't an option, then just put
30 AC_CHECK_FUNCS(pstat_getdynamic) in your
31 configure.in file.
32 HAVE_LIBPERFSTAT Define this if your system has the
33 perfstat_cpu_total function in libperfstat (AIX).
34 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
35 KERNEL_FILE Name of the kernel file 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.
47 N_NAME_POINTER 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__, __CYGWIN__]: File containing
51 load averages.
53 Specific system predefines this file uses, aside from setting
54 default values if not emacs:
56 apollo
57 BSD Real BSD, not just BSD-like.
58 convex
59 DGUX
60 eunice UNIX emulator under VMS.
61 hpux
62 __MSDOS__ No-op for MSDOS.
63 NeXT
64 sgi
65 sequent Sequent Dynix 3.x.x (BSD)
66 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
67 sony_news NEWS-OS (works at least for 4.1C)
68 UMAX
69 UMAX4_3
70 VMS
71 WINDOWS32 No-op for Windows95/NT.
72 __linux__ Linux: assumes /proc file system mounted.
73 Support from Michael K. Johnson.
74 __CYGWIN__ Cygwin emulates linux /proc/loadavg.
75 __NetBSD__ NetBSD: assumes /kern file system 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 /* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems
84 with partially-configured source directories. */
86 #ifndef CONFIGURING_GETLOADAVG
87 # include <config.h>
88 # include <stdbool.h>
89 #endif
91 /* Specification. */
92 #include <stdlib.h>
94 #include <errno.h>
95 #include <stdio.h>
97 /* Exclude all the code except the test program at the end
98 if the system has its own `getloadavg' function. */
100 #ifndef HAVE_GETLOADAVG
102 # include <sys/types.h>
104 /* Both the Emacs and non-Emacs sections want this. Some
105 configuration files' definitions for the LOAD_AVE_CVT macro (like
106 sparc.h's) use macros like FSCALE, defined here. */
107 # if defined (unix) || defined (__unix)
108 # include <sys/param.h>
109 # endif
111 # include "c-strtod.h"
112 # include "cloexec.h"
113 # include "intprops.h"
115 /* The existing Emacs configuration files define a macro called
116 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
117 returns the load average multiplied by 100. What we actually want
118 is a macro called LDAV_CVT, which returns the load average as an
119 unmultiplied double.
121 For backwards compatibility, we'll define LDAV_CVT in terms of
122 LOAD_AVE_CVT, but future machine config files should just define
123 LDAV_CVT directly. */
125 # if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT)
126 # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
127 # endif
129 # if !defined (BSD) && defined (ultrix)
130 /* Ultrix behaves like BSD on Vaxen. */
131 # define BSD
132 # endif
134 # ifdef NeXT
135 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
136 conflicts with the definition understood in this file, that this
137 really is BSD. */
138 # undef BSD
140 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
141 defined to mean that the nlist method should be used, which is not true. */
142 # undef FSCALE
143 # endif
145 /* Same issues as for NeXT apply to the HURD-based GNU system. */
146 # ifdef __GNU__
147 # undef BSD
148 # undef FSCALE
149 # endif /* __GNU__ */
151 /* Set values that are different from the defaults, which are
152 set a little farther down with #ifndef. */
155 /* Some shorthands. */
157 # if defined (HPUX) && !defined (hpux)
158 # define hpux
159 # endif
161 # if defined (__hpux) && !defined (hpux)
162 # define hpux
163 # endif
165 # if defined (__sun) && !defined (sun)
166 # define sun
167 # endif
169 # if defined (hp300) && !defined (hpux)
170 # define MORE_BSD
171 # endif
173 # if defined (ultrix) && defined (mips)
174 # define decstation
175 # endif
177 # if defined (__SVR4) && !defined (SVR4)
178 # define SVR4
179 # endif
181 # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2)
182 # define SUNOS_5
183 # endif
185 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
186 # define OSF_ALPHA
187 # include <sys/mbuf.h>
188 # include <sys/socket.h>
189 # include <net/route.h>
190 # include <sys/table.h>
191 /* Tru64 4.0D's table.h redefines sys */
192 # undef sys
193 # endif
195 # if defined (__osf__) && (defined (mips) || defined (__mips__))
196 # define OSF_MIPS
197 # include <sys/table.h>
198 # endif
200 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
201 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
202 that with a couple of other things and we'll have a unique match. */
203 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
204 # define tek4300 /* Define by emacs, but not by other users. */
205 # endif
208 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
209 # ifndef LOAD_AVE_TYPE
211 # ifdef MORE_BSD
212 # define LOAD_AVE_TYPE long
213 # endif
215 # ifdef sun
216 # define LOAD_AVE_TYPE long
217 # endif
219 # ifdef decstation
220 # define LOAD_AVE_TYPE long
221 # endif
223 # ifdef _SEQUENT_
224 # define LOAD_AVE_TYPE long
225 # endif
227 # ifdef sgi
228 # define LOAD_AVE_TYPE long
229 # endif
231 # ifdef SVR4
232 # define LOAD_AVE_TYPE long
233 # endif
235 # ifdef sony_news
236 # define LOAD_AVE_TYPE long
237 # endif
239 # ifdef sequent
240 # define LOAD_AVE_TYPE long
241 # endif
243 # ifdef OSF_ALPHA
244 # define LOAD_AVE_TYPE long
245 # endif
247 # if defined (ardent) && defined (titan)
248 # define LOAD_AVE_TYPE long
249 # endif
251 # ifdef tek4300
252 # define LOAD_AVE_TYPE long
253 # endif
255 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */
256 # define LOAD_AVE_TYPE long
257 # endif
259 # if defined _AIX && ! defined HAVE_LIBPERFSTAT
260 # define LOAD_AVE_TYPE long
261 # endif
263 # ifdef convex
264 # define LOAD_AVE_TYPE double
265 # ifndef LDAV_CVT
266 # define LDAV_CVT(n) (n)
267 # endif
268 # endif
270 # endif /* No LOAD_AVE_TYPE. */
272 # ifdef OSF_ALPHA
273 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
274 according to ghazi@noc.rutgers.edu. */
275 # undef FSCALE
276 # define FSCALE 1024.0
277 # endif
279 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */
280 /* <sys/param.h> defines an incorrect value for FSCALE on an
281 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
282 # undef FSCALE
283 # define FSCALE 100.0
284 # endif
287 # ifndef FSCALE
289 /* SunOS and some others define FSCALE in sys/param.h. */
291 # ifdef MORE_BSD
292 # define FSCALE 2048.0
293 # endif
295 # if defined (MIPS) || defined (SVR4) || defined (decstation)
296 # define FSCALE 256
297 # endif
299 # if defined (sgi) || defined (sequent)
300 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
301 above under #ifdef MIPS. But we want the sgi value. */
302 # undef FSCALE
303 # define FSCALE 1000.0
304 # endif
306 # if defined (ardent) && defined (titan)
307 # define FSCALE 65536.0
308 # endif
310 # ifdef tek4300
311 # define FSCALE 100.0
312 # endif
314 # if defined _AIX && !defined HAVE_LIBPERFSTAT
315 # define FSCALE 65536.0
316 # endif
318 # endif /* Not FSCALE. */
320 # if !defined (LDAV_CVT) && defined (FSCALE)
321 # define LDAV_CVT(n) (((double) (n)) / FSCALE)
322 # endif
324 # ifndef NLIST_STRUCT
325 # if HAVE_NLIST_H
326 # define NLIST_STRUCT
327 # endif
328 # endif
330 # if defined (sgi) || (defined (mips) && !defined (BSD))
331 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
332 # endif
335 # if !defined (KERNEL_FILE) && defined (sequent)
336 # define KERNEL_FILE "/dynix"
337 # endif
339 # if !defined (KERNEL_FILE) && defined (hpux)
340 # define KERNEL_FILE "/hp-ux"
341 # endif
343 # if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
344 # define KERNEL_FILE "/unix"
345 # endif
348 # if !defined (LDAV_SYMBOL) && defined (alliant)
349 # define LDAV_SYMBOL "_Loadavg"
350 # endif
352 # if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || (defined (_AIX) && !defined(HAVE_LIBPERFSTAT)))
353 # define LDAV_SYMBOL "avenrun"
354 # endif
356 # include <unistd.h>
358 /* LOAD_AVE_TYPE should only get defined if we're going to use the
359 nlist method. */
360 # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL))
361 # define LOAD_AVE_TYPE double
362 # endif
364 # ifdef LOAD_AVE_TYPE
366 # ifndef __VMS
367 # ifndef __linux__
368 # ifndef NLIST_STRUCT
369 # include <a.out.h>
370 # else /* NLIST_STRUCT */
371 # include <nlist.h>
372 # endif /* NLIST_STRUCT */
374 # ifdef SUNOS_5
375 # include <fcntl.h>
376 # include <kvm.h>
377 # include <kstat.h>
378 # endif
380 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
381 # include <sys/pstat.h>
382 # endif
384 # ifndef KERNEL_FILE
385 # define KERNEL_FILE "/vmunix"
386 # endif /* KERNEL_FILE */
388 # ifndef LDAV_SYMBOL
389 # define LDAV_SYMBOL "_avenrun"
390 # endif /* LDAV_SYMBOL */
391 # endif /* __linux__ */
393 # else /* __VMS */
395 # ifndef eunice
396 # include <iodef.h>
397 # include <descrip.h>
398 # else /* eunice */
399 # include <vms/iodef.h>
400 # endif /* eunice */
401 # endif /* __VMS */
403 # ifndef LDAV_CVT
404 # define LDAV_CVT(n) ((double) (n))
405 # endif /* !LDAV_CVT */
407 # endif /* LOAD_AVE_TYPE */
409 # if defined HAVE_LIBPERFSTAT
410 # include <sys/protosw.h>
411 # include <libperfstat.h>
412 # include <sys/proc.h>
413 # ifndef SBITS
414 # define SBITS 16
415 # endif
416 # endif
418 # if defined (__GNU__) && !defined (NeXT)
419 /* Note that NeXT Openstep defines __GNU__ even though it should not. */
420 /* GNU system acts much like NeXT, for load average purposes,
421 but not exactly. */
422 # define NeXT
423 # define host_self mach_host_self
424 # endif
426 # ifdef NeXT
427 # ifdef HAVE_MACH_MACH_H
428 # include <mach/mach.h>
429 # else
430 # include <mach.h>
431 # endif
432 # endif /* NeXT */
434 # ifdef sgi
435 # include <sys/sysmp.h>
436 # endif /* sgi */
438 # ifdef UMAX
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 # include "fcntl--.h"
465 \f
466 /* Avoid static vars inside a function since in HPUX they dump as pure. */
468 # ifdef NeXT
469 static processor_set_t default_set;
470 static bool getloadavg_initialized;
471 # endif /* NeXT */
473 # ifdef UMAX
474 static unsigned int cpus = 0;
475 static unsigned int samples;
476 # endif /* UMAX */
478 # ifdef DGUX
479 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
480 # endif /* DGUX */
482 # if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE)
483 /* File descriptor open to /dev/kmem or VMS load ave driver. */
484 static int channel;
485 /* True iff channel is valid. */
486 static bool getloadavg_initialized;
487 /* Offset in kmem to seek to read load average, or 0 means invalid. */
488 static long offset;
490 # if ! defined __VMS && ! defined sgi && ! defined __linux__
491 static struct nlist nl[2];
492 # endif
494 # ifdef SUNOS_5
495 static kvm_t *kd;
496 # endif /* SUNOS_5 */
498 # endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
499 \f
500 /* Put the 1 minute, 5 minute and 15 minute load averages
501 into the first NELEM elements of LOADAVG.
502 Return the number written (never more than 3, but may be less than NELEM),
503 or -1 if an error occurred. */
505 int
506 getloadavg (double loadavg[], int nelem)
507 {
508 int elem = 0; /* Return value. */
510 # ifdef NO_GET_LOAD_AVG
511 # define LDAV_DONE
512 /* Set errno to zero to indicate that there was no particular error;
513 this function just can't work at all on this system. */
514 errno = 0;
515 elem = -1;
516 # endif
518 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
519 /* Use libkstat because we don't have to be root. */
520 # define LDAV_DONE
521 kstat_ctl_t *kc;
522 kstat_t *ksp;
523 kstat_named_t *kn;
525 kc = kstat_open ();
526 if (kc == 0)
527 return -1;
528 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
529 if (ksp == 0)
530 return -1;
531 if (kstat_read (kc, ksp, 0) == -1)
532 return -1;
535 kn = kstat_data_lookup (ksp, "avenrun_1min");
536 if (kn == 0)
537 {
538 /* Return -1 if no load average information is available. */
539 nelem = 0;
540 elem = -1;
541 }
543 if (nelem >= 1)
544 loadavg[elem++] = (double) kn->value.ul / FSCALE;
546 if (nelem >= 2)
547 {
548 kn = kstat_data_lookup (ksp, "avenrun_5min");
549 if (kn != 0)
550 {
551 loadavg[elem++] = (double) kn->value.ul / FSCALE;
553 if (nelem >= 3)
554 {
555 kn = kstat_data_lookup (ksp, "avenrun_15min");
556 if (kn != 0)
557 loadavg[elem++] = (double) kn->value.ul / FSCALE;
558 }
559 }
560 }
562 kstat_close (kc);
563 # endif /* HAVE_LIBKSTAT */
565 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
566 /* Use pstat_getdynamic() because we don't have to be root. */
567 # define LDAV_DONE
568 # undef LOAD_AVE_TYPE
570 struct pst_dynamic dyn_info;
571 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
572 return -1;
573 if (nelem > 0)
574 loadavg[elem++] = dyn_info.psd_avg_1_min;
575 if (nelem > 1)
576 loadavg[elem++] = dyn_info.psd_avg_5_min;
577 if (nelem > 2)
578 loadavg[elem++] = dyn_info.psd_avg_15_min;
580 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
582 # if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT
583 # define LDAV_DONE
584 # undef LOAD_AVE_TYPE
585 /* Use perfstat_cpu_total because we don't have to be root. */
586 {
587 perfstat_cpu_total_t cpu_stats;
588 int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1);
589 if (result == -1)
590 return result;
591 loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS);
592 loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS);
593 loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS);
594 elem = 3;
595 }
596 # endif
598 # if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__))
599 # define LDAV_DONE
600 # undef LOAD_AVE_TYPE
602 # ifndef LINUX_LDAV_FILE
603 # define LINUX_LDAV_FILE "/proc/loadavg"
604 # endif
606 char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")];
607 char const *ptr = ldavgbuf;
608 int fd, count;
610 fd = open (LINUX_LDAV_FILE, O_RDONLY);
611 if (fd == -1)
612 return -1;
613 count = read (fd, ldavgbuf, sizeof ldavgbuf - 1);
614 (void) close (fd);
615 if (count <= 0)
616 return -1;
617 ldavgbuf[count] = '\0';
619 for (elem = 0; elem < nelem; elem++)
620 {
621 char *endptr;
622 double d;
624 errno = 0;
625 d = c_strtod (ptr, &endptr);
626 if (ptr == endptr || (d == 0 && errno != 0))
627 {
628 if (elem == 0)
629 return -1;
630 break;
631 }
632 loadavg[elem] = d;
633 ptr = endptr;
634 }
636 return elem;
638 # endif /* __linux__ || __CYGWIN__ */
640 # if !defined (LDAV_DONE) && defined (__NetBSD__)
641 # define LDAV_DONE
642 # undef LOAD_AVE_TYPE
644 # ifndef NETBSD_LDAV_FILE
645 # define NETBSD_LDAV_FILE "/kern/loadavg"
646 # endif
648 unsigned long int load_ave[3], scale;
649 int count;
650 FILE *fp;
652 fp = fopen (NETBSD_LDAV_FILE, "r");
653 if (fp == NULL)
654 return -1;
655 count = fscanf (fp, "%lu %lu %lu %lu\n",
656 &load_ave[0], &load_ave[1], &load_ave[2],
657 &scale);
658 (void) fclose (fp);
659 if (count != 4)
660 return -1;
662 for (elem = 0; elem < nelem; elem++)
663 loadavg[elem] = (double) load_ave[elem] / (double) scale;
665 return elem;
667 # endif /* __NetBSD__ */
669 # if !defined (LDAV_DONE) && defined (NeXT)
670 # define LDAV_DONE
671 /* The NeXT code was adapted from iscreen 3.2. */
673 host_t host;
674 struct processor_set_basic_info info;
675 unsigned int info_count;
677 /* We only know how to get the 1-minute average for this system,
678 so even if the caller asks for more than 1, we only return 1. */
680 if (!getloadavg_initialized)
681 {
682 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
683 getloadavg_initialized = true;
684 }
686 if (getloadavg_initialized)
687 {
688 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
689 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
690 (processor_set_info_t) &info, &info_count)
691 != KERN_SUCCESS)
692 getloadavg_initialized = false;
693 else
694 {
695 if (nelem > 0)
696 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
697 }
698 }
700 if (!getloadavg_initialized)
701 return -1;
702 # endif /* NeXT */
704 # if !defined (LDAV_DONE) && defined (UMAX)
705 # define LDAV_DONE
706 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
707 have a /dev/kmem. Information about the workings of the running kernel
708 can be gathered with inq_stats system calls.
709 We only know how to get the 1-minute average for this system. */
711 struct proc_summary proc_sum_data;
712 struct stat_descr proc_info;
713 double load;
714 register unsigned int i, j;
716 if (cpus == 0)
717 {
718 register unsigned int c, i;
719 struct cpu_config conf;
720 struct stat_descr desc;
722 desc.sd_next = 0;
723 desc.sd_subsys = SUBSYS_CPU;
724 desc.sd_type = CPUTYPE_CONFIG;
725 desc.sd_addr = (char *) &conf;
726 desc.sd_size = sizeof conf;
728 if (inq_stats (1, &desc))
729 return -1;
731 c = 0;
732 for (i = 0; i < conf.config_maxclass; ++i)
733 {
734 struct class_stats stats;
735 bzero ((char *) &stats, sizeof stats);
737 desc.sd_type = CPUTYPE_CLASS;
738 desc.sd_objid = i;
739 desc.sd_addr = (char *) &stats;
740 desc.sd_size = sizeof stats;
742 if (inq_stats (1, &desc))
743 return -1;
745 c += stats.class_numcpus;
746 }
747 cpus = c;
748 samples = cpus < 2 ? 3 : (2 * cpus / 3);
749 }
751 proc_info.sd_next = 0;
752 proc_info.sd_subsys = SUBSYS_PROC;
753 proc_info.sd_type = PROCTYPE_SUMMARY;
754 proc_info.sd_addr = (char *) &proc_sum_data;
755 proc_info.sd_size = sizeof (struct proc_summary);
756 proc_info.sd_sizeused = 0;
758 if (inq_stats (1, &proc_info) != 0)
759 return -1;
761 load = proc_sum_data.ps_nrunnable;
762 j = 0;
763 for (i = samples - 1; i > 0; --i)
764 {
765 load += proc_sum_data.ps_nrun[j];
766 if (j++ == PS_NRUNSIZE)
767 j = 0;
768 }
770 if (nelem > 0)
771 loadavg[elem++] = load / samples / cpus;
772 # endif /* UMAX */
774 # if !defined (LDAV_DONE) && defined (DGUX)
775 # define LDAV_DONE
776 /* This call can return -1 for an error, but with good args
777 it's not supposed to fail. The first argument is for no
778 apparent reason of type `long int *'. */
779 dg_sys_info ((long int *) &load_info,
780 DG_SYS_INFO_LOAD_INFO_TYPE,
781 DG_SYS_INFO_LOAD_VERSION_0);
783 if (nelem > 0)
784 loadavg[elem++] = load_info.one_minute;
785 if (nelem > 1)
786 loadavg[elem++] = load_info.five_minute;
787 if (nelem > 2)
788 loadavg[elem++] = load_info.fifteen_minute;
789 # endif /* DGUX */
791 # if !defined (LDAV_DONE) && defined (apollo)
792 # define LDAV_DONE
793 /* Apollo code from lisch@mentorg.com (Ray Lischner).
795 This system call is not documented. The load average is obtained as
796 three long integers, for the load average over the past minute,
797 five minutes, and fifteen minutes. Each value is a scaled integer,
798 with 16 bits of integer part and 16 bits of fraction part.
800 I'm not sure which operating system first supported this system call,
801 but I know that SR10.2 supports it. */
803 extern void proc1_$get_loadav ();
804 unsigned long load_ave[3];
806 proc1_$get_loadav (load_ave);
808 if (nelem > 0)
809 loadavg[elem++] = load_ave[0] / 65536.0;
810 if (nelem > 1)
811 loadavg[elem++] = load_ave[1] / 65536.0;
812 if (nelem > 2)
813 loadavg[elem++] = load_ave[2] / 65536.0;
814 # endif /* apollo */
816 # if !defined (LDAV_DONE) && defined (OSF_MIPS)
817 # define LDAV_DONE
819 struct tbl_loadavg load_ave;
820 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
821 loadavg[elem++]
822 = (load_ave.tl_lscale == 0
823 ? load_ave.tl_avenrun.d[0]
824 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
825 # endif /* OSF_MIPS */
827 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
828 # define LDAV_DONE
830 /* A faithful emulation is going to have to be saved for a rainy day. */
831 for ( ; elem < nelem; elem++)
832 {
833 loadavg[elem] = 0.0;
834 }
835 # endif /* __MSDOS__ || WINDOWS32 */
837 # if !defined (LDAV_DONE) && defined (OSF_ALPHA)
838 # define LDAV_DONE
840 struct tbl_loadavg load_ave;
841 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
842 for (elem = 0; elem < nelem; elem++)
843 loadavg[elem]
844 = (load_ave.tl_lscale == 0
845 ? load_ave.tl_avenrun.d[elem]
846 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
847 # endif /* OSF_ALPHA */
849 # if ! defined LDAV_DONE && defined __VMS
850 /* VMS specific code -- read from the Load Ave driver. */
852 LOAD_AVE_TYPE load_ave[3];
853 static bool getloadavg_initialized;
854 # ifdef eunice
855 struct
856 {
857 int dsc$w_length;
858 char *dsc$a_pointer;
859 } descriptor;
860 # endif
862 /* Ensure that there is a channel open to the load ave device. */
863 if (!getloadavg_initialized)
864 {
865 /* Attempt to open the channel. */
866 # ifdef eunice
867 descriptor.dsc$w_length = 18;
868 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
869 # else
870 $DESCRIPTOR (descriptor, "LAV0:");
871 # endif
872 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
873 getloadavg_initialized = true;
874 }
876 /* Read the load average vector. */
877 if (getloadavg_initialized
878 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
879 load_ave, 12, 0, 0, 0, 0) & 1))
880 {
881 sys$dassgn (channel);
882 getloadavg_initialized = false;
883 }
885 if (!getloadavg_initialized)
886 return -1;
887 # endif /* ! defined LDAV_DONE && defined __VMS */
889 # if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS
891 /* UNIX-specific code -- read the average from /dev/kmem. */
893 # define LDAV_PRIVILEGED /* This code requires special installation. */
895 LOAD_AVE_TYPE load_ave[3];
897 /* Get the address of LDAV_SYMBOL. */
898 if (offset == 0)
899 {
900 # ifndef sgi
901 # if ! defined NLIST_STRUCT || ! defined N_NAME_POINTER
902 strcpy (nl[0].n_name, LDAV_SYMBOL);
903 strcpy (nl[1].n_name, "");
904 # else /* NLIST_STRUCT */
905 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
906 nl[0].n_un.n_name = LDAV_SYMBOL;
907 nl[1].n_un.n_name = 0;
908 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
909 nl[0].n_name = LDAV_SYMBOL;
910 nl[1].n_name = 0;
911 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
912 # endif /* NLIST_STRUCT */
914 # ifndef SUNOS_5
915 if (
916 # if !(defined (_AIX) && !defined (ps2))
917 nlist (KERNEL_FILE, nl)
918 # else /* _AIX */
919 knlist (nl, 1, sizeof (nl[0]))
920 # endif
921 >= 0)
922 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
923 {
924 # ifdef FIXUP_KERNEL_SYMBOL_ADDR
925 FIXUP_KERNEL_SYMBOL_ADDR (nl);
926 # endif
927 offset = nl[0].n_value;
928 }
929 # endif /* !SUNOS_5 */
930 # else /* sgi */
931 int ldav_off;
933 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
934 if (ldav_off != -1)
935 offset = (long int) ldav_off & 0x7fffffff;
936 # endif /* sgi */
937 }
939 /* Make sure we have /dev/kmem open. */
940 if (!getloadavg_initialized)
941 {
942 # ifndef SUNOS_5
943 channel = open ("/dev/kmem", O_RDONLY);
944 if (channel >= 0)
945 {
946 /* Set the channel to close on exec, so it does not
947 litter any child's descriptor table. */
948 set_cloexec_flag (channel, true);
949 getloadavg_initialized = true;
950 }
951 # else /* SUNOS_5 */
952 /* We pass 0 for the kernel, corefile, and swapfile names
953 to use the currently running kernel. */
954 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
955 if (kd != 0)
956 {
957 /* nlist the currently running kernel. */
958 kvm_nlist (kd, nl);
959 offset = nl[0].n_value;
960 getloadavg_initialized = true;
961 }
962 # endif /* SUNOS_5 */
963 }
965 /* If we can, get the load average values. */
966 if (offset && getloadavg_initialized)
967 {
968 /* Try to read the load. */
969 # ifndef SUNOS_5
970 if (lseek (channel, offset, 0) == -1L
971 || read (channel, (char *) load_ave, sizeof (load_ave))
972 != sizeof (load_ave))
973 {
974 close (channel);
975 getloadavg_initialized = false;
976 }
977 # else /* SUNOS_5 */
978 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
979 != sizeof (load_ave))
980 {
981 kvm_close (kd);
982 getloadavg_initialized = false;
983 }
984 # endif /* SUNOS_5 */
985 }
987 if (offset == 0 || !getloadavg_initialized)
988 return -1;
989 # endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */
991 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
992 if (nelem > 0)
993 loadavg[elem++] = LDAV_CVT (load_ave[0]);
994 if (nelem > 1)
995 loadavg[elem++] = LDAV_CVT (load_ave[1]);
996 if (nelem > 2)
997 loadavg[elem++] = LDAV_CVT (load_ave[2]);
999 # define LDAV_DONE
1000 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */
1002 # if !defined LDAV_DONE
1003 /* Set errno to zero to indicate that there was no particular error;
1004 this function just can't work at all on this system. */
1005 errno = 0;
1006 elem = -1;
1007 # endif
1008 return elem;
1009 }
1011 #endif /* ! HAVE_GETLOADAVG */
1012 \f
1013 #ifdef TEST
1014 int
1015 main (int argc, char **argv)
1016 {
1017 int naptime = 0;
1019 if (argc > 1)
1020 naptime = atoi (argv[1]);
1022 while (1)
1023 {
1024 double avg[3];
1025 int loads;
1027 errno = 0; /* Don't be misled if it doesn't set errno. */
1028 loads = getloadavg (avg, 3);
1029 if (loads == -1)
1030 {
1031 perror ("Error getting load average");
1032 return EXIT_FAILURE;
1033 }
1034 if (loads > 0)
1035 printf ("1-minute: %f ", avg[0]);
1036 if (loads > 1)
1037 printf ("5-minute: %f ", avg[1]);
1038 if (loads > 2)
1039 printf ("15-minute: %f ", avg[2]);
1040 if (loads > 0)
1041 putchar ('\n');
1043 if (naptime == 0)
1044 break;
1045 sleep (naptime);
1046 }
1048 return EXIT_SUCCESS;
1049 }
1050 #endif /* TEST */