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[make.git] / getloadavg.c
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1 /* Get the system load averages.
2 Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995
3 Free Software Foundation, Inc.
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.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 /* Compile-time symbols that this file uses:
21 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
22 KERNEL_FILE Pathname of the kernel to nlist.
23 LDAV_CVT() Scale the load average from the kernel.
24 Returns a double.
25 LDAV_SYMBOL Name of kernel symbol giving load average.
26 LOAD_AVE_TYPE Type of the load average array in the kernel.
27 Must be defined unless one of
28 apollo, DGUX, NeXT, or UMAX is defined;
29 otherwise, no load average is available.
30 NLIST_STRUCT Include nlist.h, not a.out.h, and
31 the nlist n_name element is a pointer,
32 not an array.
33 NLIST_NAME_UNION struct nlist has an n_un member, not n_name.
34 LINUX_LDAV_FILE [__linux__]: File containing load averages.
36 Specific system predefines this file uses, aside from setting
37 default values if not emacs:
39 apollo
40 BSD Real BSD, not just BSD-like.
41 DGUX
42 eunice UNIX emulator under VMS.
43 hpux
44 NeXT
45 sgi
46 sequent Sequent Dynix 3.x.x (BSD)
47 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
48 sony_news NEWS-OS (works at least for 4.1C)
49 UMAX
50 UMAX4_3
51 VMS
52 __linux__ Linux: assumes /proc filesystem mounted.
53 Support from Michael K. Johnson.
54 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
56 In addition, to avoid nesting many #ifdefs, we internally set
57 LDAV_DONE to indicate that the load average has been computed.
59 We also #define LDAV_PRIVILEGED if a program will require
60 special installation to be able to call getloadavg. */
62 /* This should always be first. */
63 #ifdef HAVE_CONFIG_H
64 #include <config.h>
65 #endif
67 #include <sys/types.h>
69 /* Both the Emacs and non-Emacs sections want this. Some
70 configuration files' definitions for the LOAD_AVE_CVT macro (like
71 sparc.h's) use macros like FSCALE, defined here. */
72 #ifdef unix
73 #include <sys/param.h>
74 #endif
77 /* Exclude all the code except the test program at the end
78 if the system has its own `getloadavg' function.
80 The declaration of `errno' is needed by the test program
81 as well as the function itself, so it comes first. */
83 #include <errno.h>
85 #ifndef errno
86 extern int errno;
87 #endif
89 #ifndef HAVE_GETLOADAVG
92 /* The existing Emacs configuration files define a macro called
93 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
94 returns the load average multiplied by 100. What we actually want
95 is a macro called LDAV_CVT, which returns the load average as an
96 unmultiplied double.
98 For backwards compatibility, we'll define LDAV_CVT in terms of
99 LOAD_AVE_CVT, but future machine config files should just define
100 LDAV_CVT directly. */
102 #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
103 #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
104 #endif
106 #if !defined (BSD) && defined (ultrix)
107 /* Ultrix behaves like BSD on Vaxen. */
108 #define BSD
109 #endif
111 #ifdef NeXT
112 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
113 conflicts with the definition understood in this file, that this
114 really is BSD. */
115 #undef BSD
117 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
118 defined to mean that the nlist method should be used, which is not true. */
119 #undef FSCALE
120 #endif
122 /* Set values that are different from the defaults, which are
123 set a little farther down with #ifndef. */
126 /* Some shorthands. */
128 #if defined (HPUX) && !defined (hpux)
129 #define hpux
130 #endif
132 #if defined(hp300) && !defined(hpux)
133 #define MORE_BSD
134 #endif
136 #if defined(ultrix) && defined(mips)
137 #define decstation
138 #endif
140 #if defined(sun) && defined(SVR4)
141 #define SUNOS_5
142 #endif
144 #if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
145 #define OSF_ALPHA
146 #include <sys/table.h>
147 #endif
149 #if defined (__osf__) && (defined (mips) || defined (__mips__))
150 #define OSF_MIPS
151 #include <sys/table.h>
152 #endif
154 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
155 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
156 that with a couple of other things and we'll have a unique match. */
157 #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
158 #define tek4300 /* Define by emacs, but not by other users. */
159 #endif
162 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
163 #ifndef LOAD_AVE_TYPE
165 #ifdef MORE_BSD
166 #define LOAD_AVE_TYPE long
167 #endif
169 #ifdef sun
170 #define LOAD_AVE_TYPE long
171 #endif
173 #ifdef decstation
174 #define LOAD_AVE_TYPE long
175 #endif
177 #ifdef _SEQUENT_
178 #define LOAD_AVE_TYPE long
179 #endif
181 #ifdef sgi
182 #define LOAD_AVE_TYPE long
183 #endif
185 #ifdef SVR4
186 #define LOAD_AVE_TYPE long
187 #endif
189 #ifdef sony_news
190 #define LOAD_AVE_TYPE long
191 #endif
193 #ifdef sequent
194 #define LOAD_AVE_TYPE long
195 #endif
197 #ifdef OSF_ALPHA
198 #define LOAD_AVE_TYPE long
199 #endif
201 #if defined (ardent) && defined (titan)
202 #define LOAD_AVE_TYPE long
203 #endif
205 #ifdef tek4300
206 #define LOAD_AVE_TYPE long
207 #endif
209 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
210 #define LOAD_AVE_TYPE long
211 #endif
213 #endif /* No LOAD_AVE_TYPE. */
215 #ifdef OSF_ALPHA
216 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
217 according to ghazi@noc.rutgers.edu. */
218 #undef FSCALE
219 #define FSCALE 1024.0
220 #endif
222 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
223 /* <sys/param.h> defines an incorrect value for FSCALE on an
224 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
225 #undef FSCALE
226 #define FSCALE 100.0
227 #endif
230 #ifndef FSCALE
232 /* SunOS and some others define FSCALE in sys/param.h. */
234 #ifdef MORE_BSD
235 #define FSCALE 2048.0
236 #endif
238 #if defined(MIPS) || defined(SVR4) || defined(decstation)
239 #define FSCALE 256
240 #endif
242 #if defined (sgi) || defined (sequent)
243 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
244 above under #ifdef MIPS. But we want the sgi value. */
245 #undef FSCALE
246 #define FSCALE 1000.0
247 #endif
249 #if defined (ardent) && defined (titan)
250 #define FSCALE 65536.0
251 #endif
253 #ifdef tek4300
254 #define FSCALE 100.0
255 #endif
257 #endif /* Not FSCALE. */
259 #if !defined (LDAV_CVT) && defined (FSCALE)
260 #define LDAV_CVT(n) (((double) (n)) / FSCALE)
261 #endif
263 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
264 #ifndef NLIST_STRUCT
266 #ifdef MORE_BSD
267 #define NLIST_STRUCT
268 #endif
270 #ifdef sun
271 #define NLIST_STRUCT
272 #endif
274 #ifdef decstation
275 #define NLIST_STRUCT
276 #endif
278 #ifdef hpux
279 #define NLIST_STRUCT
280 #endif
282 #if defined (_SEQUENT_) || defined (sequent)
283 #define NLIST_STRUCT
284 #endif
286 #ifdef sgi
287 #define NLIST_STRUCT
288 #endif
290 #ifdef SVR4
291 #define NLIST_STRUCT
292 #endif
294 #ifdef sony_news
295 #define NLIST_STRUCT
296 #endif
298 #ifdef OSF_ALPHA
299 #define NLIST_STRUCT
300 #endif
302 #if defined (ardent) && defined (titan)
303 #define NLIST_STRUCT
304 #endif
306 #ifdef tek4300
307 #define NLIST_STRUCT
308 #endif
310 #ifdef butterfly
311 #define NLIST_STRUCT
312 #endif
314 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
315 #define NLIST_STRUCT
316 #endif
318 #endif /* defined (NLIST_STRUCT) */
321 #if defined(sgi) || (defined(mips) && !defined(BSD))
322 #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
323 #endif
326 #if !defined (KERNEL_FILE) && defined (sequent)
327 #define KERNEL_FILE "/dynix"
328 #endif
330 #if !defined (KERNEL_FILE) && defined (hpux)
331 #define KERNEL_FILE "/hp-ux"
332 #endif
334 #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
335 #define KERNEL_FILE "/unix"
336 #endif
339 #if !defined (LDAV_SYMBOL) && defined (alliant)
340 #define LDAV_SYMBOL "_Loadavg"
341 #endif
343 #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)))
344 #define LDAV_SYMBOL "avenrun"
345 #endif
347 #ifdef HAVE_UNISTD_H
348 #include <unistd.h>
349 #endif
351 #include <stdio.h>
353 /* LOAD_AVE_TYPE should only get defined if we're going to use the
354 nlist method. */
355 #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
356 #define LOAD_AVE_TYPE double
357 #endif
359 #ifdef LOAD_AVE_TYPE
361 #ifndef VMS
362 #ifndef NLIST_STRUCT
363 #include <a.out.h>
364 #else /* NLIST_STRUCT */
365 #include <nlist.h>
366 #endif /* NLIST_STRUCT */
368 #ifdef SUNOS_5
369 #include <fcntl.h>
370 #include <kvm.h>
371 #endif
373 #ifndef KERNEL_FILE
374 #define KERNEL_FILE "/vmunix"
375 #endif /* KERNEL_FILE */
377 #ifndef LDAV_SYMBOL
378 #define LDAV_SYMBOL "_avenrun"
379 #endif /* LDAV_SYMBOL */
381 #else /* VMS */
383 #ifndef eunice
384 #include <iodef.h>
385 #include <descrip.h>
386 #else /* eunice */
387 #include <vms/iodef.h>
388 #endif /* eunice */
389 #endif /* VMS */
391 #ifndef LDAV_CVT
392 #define LDAV_CVT(n) ((double) (n))
393 #endif /* !LDAV_CVT */
395 #endif /* LOAD_AVE_TYPE */
397 #ifdef NeXT
398 #ifdef HAVE_MACH_MACH_H
399 #include <mach/mach.h>
400 #else
401 #include <mach.h>
402 #endif
403 #endif /* NeXT */
405 #ifdef sgi
406 #include <sys/sysmp.h>
407 #endif /* sgi */
409 #ifdef UMAX
410 #include <stdio.h>
411 #include <signal.h>
412 #include <sys/time.h>
413 #include <sys/wait.h>
414 #include <sys/syscall.h>
416 #ifdef UMAX_43
417 #include <machine/cpu.h>
418 #include <inq_stats/statistics.h>
419 #include <inq_stats/sysstats.h>
420 #include <inq_stats/cpustats.h>
421 #include <inq_stats/procstats.h>
422 #else /* Not UMAX_43. */
423 #include <sys/sysdefs.h>
424 #include <sys/statistics.h>
425 #include <sys/sysstats.h>
426 #include <sys/cpudefs.h>
427 #include <sys/cpustats.h>
428 #include <sys/procstats.h>
429 #endif /* Not UMAX_43. */
430 #endif /* UMAX */
432 #ifdef DGUX
433 #include <sys/dg_sys_info.h>
434 #endif
436 #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
437 #include <fcntl.h>
438 #else
439 #include <sys/file.h>
440 #endif
442 /* Avoid static vars inside a function since in HPUX they dump as pure. */
444 #ifdef NeXT
445 static processor_set_t default_set;
446 static int getloadavg_initialized;
447 #endif /* NeXT */
449 #ifdef UMAX
450 static unsigned int cpus = 0;
451 static unsigned int samples;
452 #endif /* UMAX */
454 #ifdef DGUX
455 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
456 #endif /* DGUX */
458 #ifdef LOAD_AVE_TYPE
459 /* File descriptor open to /dev/kmem or VMS load ave driver. */
460 static int channel;
461 /* Nonzero iff channel is valid. */
462 static int getloadavg_initialized;
463 /* Offset in kmem to seek to read load average, or 0 means invalid. */
464 static long offset;
466 #if !defined(VMS) && !defined(sgi)
467 static struct nlist nl[2];
468 #endif /* Not VMS or sgi */
470 #ifdef SUNOS_5
471 static kvm_t *kd;
472 #endif /* SUNOS_5 */
474 #endif /* LOAD_AVE_TYPE */
476 /* Put the 1 minute, 5 minute and 15 minute load averages
477 into the first NELEM elements of LOADAVG.
478 Return the number written (never more than 3, but may be less than NELEM),
479 or -1 if an error occurred. */
482 getloadavg (loadavg, nelem)
483 double loadavg[];
484 int nelem;
486 int elem = 0; /* Return value. */
488 #ifdef NO_GET_LOAD_AVG
489 #define LDAV_DONE
490 /* Set errno to zero to indicate that there was no particular error;
491 this function just can't work at all on this system. */
492 errno = 0;
493 elem = -1;
494 #endif
496 #if !defined (LDAV_DONE) && defined (__linux__)
497 #define LDAV_DONE
498 #undef LOAD_AVE_TYPE
500 #ifndef LINUX_LDAV_FILE
501 #define LINUX_LDAV_FILE "/proc/loadavg"
502 #endif
504 char ldavgbuf[40];
505 double load_ave[3];
506 int fd, count;
508 fd = open (LINUX_LDAV_FILE, O_RDONLY);
509 if (fd == -1)
510 return -1;
511 count = read (fd, ldavgbuf, 40);
512 (void) close (fd);
513 if (count <= 0)
514 return -1;
516 count = sscanf (ldavgbuf, "%lf %lf %lf",
517 &load_ave[0], &load_ave[1], &load_ave[2]);
518 if (count < 1)
519 return -1;
521 for (elem = 0; elem < nelem && elem < count; elem++)
522 loadavg[elem] = load_ave[elem];
524 return elem;
526 #endif /* __linux__ */
528 #if !defined (LDAV_DONE) && defined (__NetBSD__)
529 #define LDAV_DONE
530 #undef LOAD_AVE_TYPE
532 #ifndef NETBSD_LDAV_FILE
533 #define NETBSD_LDAV_FILE "/kern/loadavg"
534 #endif
536 unsigned long int load_ave[3], scale;
537 int count;
538 FILE *fp;
540 fp = fopen (NETBSD_LDAV_FILE, "r");
541 if (fp == NULL)
542 return -1;
543 count = fscanf (fp, "%lu %lu %lu %lu\n",
544 &load_ave[0], &load_ave[1], &load_ave[2],
545 &scale);
546 (void) fclose (fp);
547 if (count != 4)
548 return -1;
550 for (elem = 0; elem < nelem; elem++)
551 loadavg[elem] = (double) load_ave[elem] / (double) scale;
553 return elem;
555 #endif /* __NetBSD__ */
557 #if !defined (LDAV_DONE) && defined (NeXT)
558 #define LDAV_DONE
559 /* The NeXT code was adapted from iscreen 3.2. */
561 host_t host;
562 struct processor_set_basic_info info;
563 unsigned info_count;
565 /* We only know how to get the 1-minute average for this system,
566 so even if the caller asks for more than 1, we only return 1. */
568 if (!getloadavg_initialized)
570 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
571 getloadavg_initialized = 1;
574 if (getloadavg_initialized)
576 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
577 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
578 (processor_set_info_t) &info, &info_count)
579 != KERN_SUCCESS)
580 getloadavg_initialized = 0;
581 else
583 if (nelem > 0)
584 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
588 if (!getloadavg_initialized)
589 return -1;
590 #endif /* NeXT */
592 #if !defined (LDAV_DONE) && defined (UMAX)
593 #define LDAV_DONE
594 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
595 have a /dev/kmem. Information about the workings of the running kernel
596 can be gathered with inq_stats system calls.
597 We only know how to get the 1-minute average for this system. */
599 struct proc_summary proc_sum_data;
600 struct stat_descr proc_info;
601 double load;
602 register unsigned int i, j;
604 if (cpus == 0)
606 register unsigned int c, i;
607 struct cpu_config conf;
608 struct stat_descr desc;
610 desc.sd_next = 0;
611 desc.sd_subsys = SUBSYS_CPU;
612 desc.sd_type = CPUTYPE_CONFIG;
613 desc.sd_addr = (char *) &conf;
614 desc.sd_size = sizeof conf;
616 if (inq_stats (1, &desc))
617 return -1;
619 c = 0;
620 for (i = 0; i < conf.config_maxclass; ++i)
622 struct class_stats stats;
623 bzero ((char *) &stats, sizeof stats);
625 desc.sd_type = CPUTYPE_CLASS;
626 desc.sd_objid = i;
627 desc.sd_addr = (char *) &stats;
628 desc.sd_size = sizeof stats;
630 if (inq_stats (1, &desc))
631 return -1;
633 c += stats.class_numcpus;
635 cpus = c;
636 samples = cpus < 2 ? 3 : (2 * cpus / 3);
639 proc_info.sd_next = 0;
640 proc_info.sd_subsys = SUBSYS_PROC;
641 proc_info.sd_type = PROCTYPE_SUMMARY;
642 proc_info.sd_addr = (char *) &proc_sum_data;
643 proc_info.sd_size = sizeof (struct proc_summary);
644 proc_info.sd_sizeused = 0;
646 if (inq_stats (1, &proc_info) != 0)
647 return -1;
649 load = proc_sum_data.ps_nrunnable;
650 j = 0;
651 for (i = samples - 1; i > 0; --i)
653 load += proc_sum_data.ps_nrun[j];
654 if (j++ == PS_NRUNSIZE)
655 j = 0;
658 if (nelem > 0)
659 loadavg[elem++] = load / samples / cpus;
660 #endif /* UMAX */
662 #if !defined (LDAV_DONE) && defined (DGUX)
663 #define LDAV_DONE
664 /* This call can return -1 for an error, but with good args
665 it's not supposed to fail. The first argument is for no
666 apparent reason of type `long int *'. */
667 dg_sys_info ((long int *) &load_info,
668 DG_SYS_INFO_LOAD_INFO_TYPE,
669 DG_SYS_INFO_LOAD_VERSION_0);
671 if (nelem > 0)
672 loadavg[elem++] = load_info.one_minute;
673 if (nelem > 1)
674 loadavg[elem++] = load_info.five_minute;
675 if (nelem > 2)
676 loadavg[elem++] = load_info.fifteen_minute;
677 #endif /* DGUX */
679 #if !defined (LDAV_DONE) && defined (apollo)
680 #define LDAV_DONE
681 /* Apollo code from lisch@mentorg.com (Ray Lischner).
683 This system call is not documented. The load average is obtained as
684 three long integers, for the load average over the past minute,
685 five minutes, and fifteen minutes. Each value is a scaled integer,
686 with 16 bits of integer part and 16 bits of fraction part.
688 I'm not sure which operating system first supported this system call,
689 but I know that SR10.2 supports it. */
691 extern void proc1_$get_loadav ();
692 unsigned long load_ave[3];
694 proc1_$get_loadav (load_ave);
696 if (nelem > 0)
697 loadavg[elem++] = load_ave[0] / 65536.0;
698 if (nelem > 1)
699 loadavg[elem++] = load_ave[1] / 65536.0;
700 if (nelem > 2)
701 loadavg[elem++] = load_ave[2] / 65536.0;
702 #endif /* apollo */
704 #if !defined (LDAV_DONE) && defined (OSF_MIPS)
705 #define LDAV_DONE
707 struct tbl_loadavg load_ave;
708 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
709 loadavg[elem++]
710 = (load_ave.tl_lscale == 0
711 ? load_ave.tl_avenrun.d[0]
712 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
713 #endif /* OSF_MIPS */
715 #if !defined (LDAV_DONE) && defined (OSF_ALPHA)
716 #define LDAV_DONE
718 struct tbl_loadavg load_ave;
719 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
720 for (elem = 0; elem < nelem; elem++)
721 loadavg[elem]
722 = (load_ave.tl_lscale == 0
723 ? load_ave.tl_avenrun.d[elem]
724 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
725 #endif /* OSF_ALPHA */
727 #if !defined (LDAV_DONE) && defined (VMS)
728 /* VMS specific code -- read from the Load Ave driver. */
730 LOAD_AVE_TYPE load_ave[3];
731 static int getloadavg_initialized = 0;
732 #ifdef eunice
733 struct
735 int dsc$w_length;
736 char *dsc$a_pointer;
737 } descriptor;
738 #endif
740 /* Ensure that there is a channel open to the load ave device. */
741 if (!getloadavg_initialized)
743 /* Attempt to open the channel. */
744 #ifdef eunice
745 descriptor.dsc$w_length = 18;
746 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
747 #else
748 $DESCRIPTOR (descriptor, "LAV0:");
749 #endif
750 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
751 getloadavg_initialized = 1;
754 /* Read the load average vector. */
755 if (getloadavg_initialized
756 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
757 load_ave, 12, 0, 0, 0, 0) & 1))
759 sys$dassgn (channel);
760 getloadavg_initialized = 0;
763 if (!getloadavg_initialized)
764 return -1;
765 #endif /* VMS */
767 #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
769 /* UNIX-specific code -- read the average from /dev/kmem. */
771 #define LDAV_PRIVILEGED /* This code requires special installation. */
773 LOAD_AVE_TYPE load_ave[3];
775 /* Get the address of LDAV_SYMBOL. */
776 if (offset == 0)
778 #ifndef sgi
779 #ifndef NLIST_STRUCT
780 strcpy (nl[0].n_name, LDAV_SYMBOL);
781 strcpy (nl[1].n_name, "");
782 #else /* NLIST_STRUCT */
783 #ifdef NLIST_NAME_UNION
784 nl[0].n_un.n_name = LDAV_SYMBOL;
785 nl[1].n_un.n_name = 0;
786 #else /* not NLIST_NAME_UNION */
787 nl[0].n_name = LDAV_SYMBOL;
788 nl[1].n_name = 0;
789 #endif /* not NLIST_NAME_UNION */
790 #endif /* NLIST_STRUCT */
792 #ifndef SUNOS_5
793 if (nlist (KERNEL_FILE, nl) >= 0)
794 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
796 #ifdef FIXUP_KERNEL_SYMBOL_ADDR
797 FIXUP_KERNEL_SYMBOL_ADDR (nl);
798 #endif
799 offset = nl[0].n_value;
801 #endif /* !SUNOS_5 */
802 #else /* sgi */
803 int ldav_off;
805 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
806 if (ldav_off != -1)
807 offset = (long) ldav_off & 0x7fffffff;
808 #endif /* sgi */
811 /* Make sure we have /dev/kmem open. */
812 if (!getloadavg_initialized)
814 #ifndef SUNOS_5
815 channel = open ("/dev/kmem", 0);
816 if (channel >= 0)
817 getloadavg_initialized = 1;
818 #else /* SUNOS_5 */
819 /* We pass 0 for the kernel, corefile, and swapfile names
820 to use the currently running kernel. */
821 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
822 if (kd != 0)
824 /* nlist the currently running kernel. */
825 kvm_nlist (kd, nl);
826 offset = nl[0].n_value;
827 getloadavg_initialized = 1;
829 #endif /* SUNOS_5 */
832 /* If we can, get the load average values. */
833 if (offset && getloadavg_initialized)
835 /* Try to read the load. */
836 #ifndef SUNOS_5
837 if (lseek (channel, offset, 0) == -1L
838 || read (channel, (char *) load_ave, sizeof (load_ave))
839 != sizeof (load_ave))
841 close (channel);
842 getloadavg_initialized = 0;
844 #else /* SUNOS_5 */
845 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
846 != sizeof (load_ave))
848 kvm_close (kd);
849 getloadavg_initialized = 0;
851 #endif /* SUNOS_5 */
854 if (offset == 0 || !getloadavg_initialized)
855 return -1;
856 #endif /* LOAD_AVE_TYPE and not VMS */
858 #if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
859 if (nelem > 0)
860 loadavg[elem++] = LDAV_CVT (load_ave[0]);
861 if (nelem > 1)
862 loadavg[elem++] = LDAV_CVT (load_ave[1]);
863 if (nelem > 2)
864 loadavg[elem++] = LDAV_CVT (load_ave[2]);
866 #define LDAV_DONE
867 #endif /* !LDAV_DONE && LOAD_AVE_TYPE */
869 #ifdef LDAV_DONE
870 return elem;
871 #else
872 /* Set errno to zero to indicate that there was no particular error;
873 this function just can't work at all on this system. */
874 errno = 0;
875 return -1;
876 #endif
879 #endif /* ! HAVE_GETLOADAVG */
881 #ifdef TEST
882 void
883 main (argc, argv)
884 int argc;
885 char **argv;
887 int naptime = 0;
889 if (argc > 1)
890 naptime = atoi (argv[1]);
892 while (1)
894 double avg[3];
895 int loads;
897 errno = 0; /* Don't be misled if it doesn't set errno. */
898 loads = getloadavg (avg, 3);
899 if (loads == -1)
901 perror ("Error getting load average");
902 exit (1);
904 if (loads > 0)
905 printf ("1-minute: %f ", avg[0]);
906 if (loads > 1)
907 printf ("5-minute: %f ", avg[1]);
908 if (loads > 2)
909 printf ("15-minute: %f ", avg[2]);
910 if (loads > 0)
911 putchar ('\n');
913 if (naptime == 0)
914 break;
915 sleep (naptime);
918 exit (0);
920 #endif /* TEST */