Add missing load.c file to POTFILES.in
[make.git] / getloadavg.c
blobd8f2acd45c22f6dce29c95949f9c78866f6fae79
1 /* Get the system load averages.
2 Copyright (C) 1985-2012 Free Software Foundation, Inc.
4 GNU Make is free software; you can redistribute it and/or modify it under the
5 terms of the GNU General Public License as published by the Free Software
6 Foundation; either version 3 of the License, or (at your option) any later
7 version.
9 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License along with
14 this program. If not, see <http://www.gnu.org/licenses/>. */
16 /* Compile-time symbols that this file uses:
18 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
19 pstat_getdynamic function. I think it
20 is unique to HPUX9. The best way to get the
21 definition is through the AC_FUNC_GETLOADAVG
22 macro that comes with autoconf 2.13 or newer.
23 If that isn't an option, then just put
24 AC_CHECK_FUNCS(pstat_getdynamic) in your
25 configure.in file.
26 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
27 KERNEL_FILE Pathname of the kernel to nlist.
28 LDAV_CVT() Scale the load average from the kernel.
29 Returns a double.
30 LDAV_SYMBOL Name of kernel symbol giving load average.
31 LOAD_AVE_TYPE Type of the load average array in the kernel.
32 Must be defined unless one of
33 apollo, DGUX, NeXT, or UMAX is defined;
34 or we have libkstat;
35 otherwise, no load average is available.
36 NLIST_STRUCT Include nlist.h, not a.out.h, and
37 the nlist n_name element is a pointer,
38 not an array.
39 HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
40 LINUX_LDAV_FILE [__linux__]: File containing load averages.
42 Specific system predefines this file uses, aside from setting
43 default values if not emacs:
45 apollo
46 BSD Real BSD, not just BSD-like.
47 convex
48 DGUX
49 eunice UNIX emulator under VMS.
50 hpux
51 __MSDOS__ No-op for MSDOS.
52 NeXT
53 sgi
54 sequent Sequent Dynix 3.x.x (BSD)
55 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
56 sony_news NEWS-OS (works at least for 4.1C)
57 UMAX
58 UMAX4_3
59 VMS
60 WINDOWS32 No-op for Windows95/NT.
61 __linux__ Linux: assumes /proc filesystem mounted.
62 Support from Michael K. Johnson.
63 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
65 In addition, to avoid nesting many #ifdefs, we internally set
66 LDAV_DONE to indicate that the load average has been computed.
68 We also #define LDAV_PRIVILEGED if a program will require
69 special installation to be able to call getloadavg. */
71 /* This should always be first. */
72 #ifdef HAVE_CONFIG_H
73 # include <config.h>
74 #endif
76 #include <sys/types.h>
78 /* Both the Emacs and non-Emacs sections want this. Some
79 configuration files' definitions for the LOAD_AVE_CVT macro (like
80 sparc.h's) use macros like FSCALE, defined here. */
81 #if defined (unix) || defined (__unix)
82 # include <sys/param.h>
83 #endif
86 /* Exclude all the code except the test program at the end
87 if the system has its own 'getloadavg' function.
89 The declaration of 'errno' is needed by the test program
90 as well as the function itself, so it comes first. */
92 #include <errno.h>
94 #ifndef errno
95 extern int errno;
96 #endif
98 #if HAVE_LOCALE_H
99 # include <locale.h>
100 #endif
101 #if !HAVE_SETLOCALE
102 # define setlocale(Category, Locale) /* empty */
103 #endif
105 #ifndef HAVE_GETLOADAVG
108 /* The existing Emacs configuration files define a macro called
109 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
110 returns the load average multiplied by 100. What we actually want
111 is a macro called LDAV_CVT, which returns the load average as an
112 unmultiplied double.
114 For backwards compatibility, we'll define LDAV_CVT in terms of
115 LOAD_AVE_CVT, but future machine config files should just define
116 LDAV_CVT directly. */
118 # if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
119 # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
120 # endif
122 # if !defined (BSD) && defined (ultrix)
123 /* Ultrix behaves like BSD on Vaxen. */
124 # define BSD
125 # endif
127 # ifdef NeXT
128 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
129 conflicts with the definition understood in this file, that this
130 really is BSD. */
131 # undef BSD
133 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
134 defined to mean that the nlist method should be used, which is not true. */
135 # undef FSCALE
136 # endif
138 /* Same issues as for NeXT apply to the HURD-based GNU system. */
139 # ifdef __GNU__
140 # undef BSD
141 # undef FSCALE
142 # endif /* __GNU__ */
144 /* Set values that are different from the defaults, which are
145 set a little farther down with #ifndef. */
148 /* Some shorthands. */
150 # if defined (HPUX) && !defined (hpux)
151 # define hpux
152 # endif
154 # if defined (__hpux) && !defined (hpux)
155 # define hpux
156 # endif
158 # if defined (__sun) && !defined (sun)
159 # define sun
160 # endif
162 # if defined(hp300) && !defined(hpux)
163 # define MORE_BSD
164 # endif
166 # if defined(ultrix) && defined(mips)
167 # define decstation
168 # endif
170 # if defined (__SVR4) && !defined (SVR4)
171 # define SVR4
172 # endif
174 # if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
175 # define SUNOS_5
176 # endif
178 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
179 # define OSF_ALPHA
180 # include <sys/mbuf.h>
181 # include <sys/socket.h>
182 # include <net/route.h>
183 # include <sys/table.h>
184 # endif
186 # if defined (__osf__) && (defined (mips) || defined (__mips__))
187 # define OSF_MIPS
188 # include <sys/table.h>
189 # endif
191 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
192 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
193 that with a couple of other things and we'll have a unique match. */
194 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
195 # define tek4300 /* Define by emacs, but not by other users. */
196 # endif
198 /* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
199 # if defined(__QNX__)
200 # undef SVR4
201 # endif
203 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
204 # ifndef LOAD_AVE_TYPE
206 # ifdef MORE_BSD
207 # define LOAD_AVE_TYPE long
208 # endif
210 # ifdef sun
211 # define LOAD_AVE_TYPE long
212 # endif
214 # ifdef decstation
215 # define LOAD_AVE_TYPE long
216 # endif
218 # ifdef _SEQUENT_
219 # define LOAD_AVE_TYPE long
220 # endif
222 # ifdef sgi
223 # define LOAD_AVE_TYPE long
224 # endif
226 # ifdef SVR4
227 # define LOAD_AVE_TYPE long
228 # endif
230 # ifdef sony_news
231 # define LOAD_AVE_TYPE long
232 # endif
234 # ifdef sequent
235 # define LOAD_AVE_TYPE long
236 # endif
238 # ifdef OSF_ALPHA
239 # define LOAD_AVE_TYPE long
240 # endif
242 # if defined (ardent) && defined (titan)
243 # define LOAD_AVE_TYPE long
244 # endif
246 # ifdef tek4300
247 # define LOAD_AVE_TYPE long
248 # endif
250 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
251 # define LOAD_AVE_TYPE long
252 # endif
254 # ifdef _AIX
255 # define LOAD_AVE_TYPE long
256 # endif
258 # ifdef convex
259 # define LOAD_AVE_TYPE double
260 # ifndef LDAV_CVT
261 # define LDAV_CVT(n) (n)
262 # endif
263 # endif
265 # endif /* No LOAD_AVE_TYPE. */
267 # ifdef OSF_ALPHA
268 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
269 according to ghazi@noc.rutgers.edu. */
270 # undef FSCALE
271 # define FSCALE 1024.0
272 # endif
274 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
275 /* <sys/param.h> defines an incorrect value for FSCALE on an
276 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
277 # undef FSCALE
278 # define FSCALE 100.0
279 # endif
282 # ifndef FSCALE
284 /* SunOS and some others define FSCALE in sys/param.h. */
286 # ifdef MORE_BSD
287 # define FSCALE 2048.0
288 # endif
290 # if defined(MIPS) || defined(SVR4) || defined(decstation)
291 # define FSCALE 256
292 # endif
294 # if defined (sgi) || defined (sequent)
295 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
296 above under #ifdef MIPS. But we want the sgi value. */
297 # undef FSCALE
298 # define FSCALE 1000.0
299 # endif
301 # if defined (ardent) && defined (titan)
302 # define FSCALE 65536.0
303 # endif
305 # ifdef tek4300
306 # define FSCALE 100.0
307 # endif
309 # ifdef _AIX
310 # define FSCALE 65536.0
311 # endif
313 # endif /* Not FSCALE. */
315 # if !defined (LDAV_CVT) && defined (FSCALE)
316 # define LDAV_CVT(n) (((double) (n)) / FSCALE)
317 # endif
320 # if defined(sgi) || (defined(mips) && !defined(BSD))
321 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
322 # endif
325 # if !defined (KERNEL_FILE) && defined (sequent)
326 # define KERNEL_FILE "/dynix"
327 # endif
329 # if !defined (KERNEL_FILE) && defined (hpux)
330 # define KERNEL_FILE "/hp-ux"
331 # endif
333 # if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
334 # define KERNEL_FILE "/unix"
335 # endif
338 # if !defined (LDAV_SYMBOL) && defined (alliant)
339 # define LDAV_SYMBOL "_Loadavg"
340 # endif
342 # if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
343 # define LDAV_SYMBOL "avenrun"
344 # endif
346 # ifdef HAVE_UNISTD_H
347 # include <unistd.h>
348 # endif
350 # include <stdio.h>
352 /* LOAD_AVE_TYPE should only get defined if we're going to use the
353 nlist method. */
354 # if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) && !defined(__riscos__)
355 # define LOAD_AVE_TYPE double
356 # endif
358 # ifdef LOAD_AVE_TYPE
360 # ifndef VMS
361 # ifndef __linux__
362 # ifdef HAVE_NLIST_H
363 # include <nlist.h>
364 # else
365 # include <a.out.h>
366 # endif
368 # ifdef SUNOS_5
369 # include <fcntl.h>
370 # include <kvm.h>
371 # include <kstat.h>
372 # endif
374 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
375 # include <sys/pstat.h>
376 # endif
378 # ifndef KERNEL_FILE
379 # define KERNEL_FILE "/vmunix"
380 # endif /* KERNEL_FILE */
382 # ifndef LDAV_SYMBOL
383 # define LDAV_SYMBOL "_avenrun"
384 # endif /* LDAV_SYMBOL */
385 # endif /* __linux__ */
387 # else /* VMS */
389 # ifndef eunice
390 # include <iodef.h>
391 # include <descrip.h>
392 # else /* eunice */
393 # include <vms/iodef.h>
394 # endif /* eunice */
395 # endif /* VMS */
397 # ifndef LDAV_CVT
398 # define LDAV_CVT(n) ((double) (n))
399 # endif /* !LDAV_CVT */
401 # endif /* LOAD_AVE_TYPE */
403 # if defined(__GNU__) && !defined (NeXT)
404 /* Note that NeXT Openstep defines __GNU__ even though it should not. */
405 /* GNU system acts much like NeXT, for load average purposes,
406 but not exactly. */
407 # define NeXT
408 # define host_self mach_host_self
409 # endif
411 # ifdef NeXT
412 # ifdef HAVE_MACH_MACH_H
413 # include <mach/mach.h>
414 # else
415 # include <mach.h>
416 # endif
417 # endif /* NeXT */
419 # ifdef sgi
420 # include <sys/sysmp.h>
421 # endif /* sgi */
423 # ifdef UMAX
424 # include <stdio.h>
425 # include <signal.h>
426 # include <sys/time.h>
427 # include <sys/wait.h>
428 # include <sys/syscall.h>
430 # ifdef UMAX_43
431 # include <machine/cpu.h>
432 # include <inq_stats/statistics.h>
433 # include <inq_stats/sysstats.h>
434 # include <inq_stats/cpustats.h>
435 # include <inq_stats/procstats.h>
436 # else /* Not UMAX_43. */
437 # include <sys/sysdefs.h>
438 # include <sys/statistics.h>
439 # include <sys/sysstats.h>
440 # include <sys/cpudefs.h>
441 # include <sys/cpustats.h>
442 # include <sys/procstats.h>
443 # endif /* Not UMAX_43. */
444 # endif /* UMAX */
446 # ifdef DGUX
447 # include <sys/dg_sys_info.h>
448 # endif
450 # if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
451 # include <fcntl.h>
452 # else
453 # include <sys/file.h>
454 # endif
457 /* Avoid static vars inside a function since in HPUX they dump as pure. */
459 # ifdef NeXT
460 static processor_set_t default_set;
461 static int getloadavg_initialized;
462 # endif /* NeXT */
464 # ifdef UMAX
465 static unsigned int cpus = 0;
466 static unsigned int samples;
467 # endif /* UMAX */
469 # ifdef DGUX
470 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
471 # endif /* DGUX */
473 #if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
474 /* File descriptor open to /dev/kmem or VMS load ave driver. */
475 static int channel;
476 /* Nonzero iff channel is valid. */
477 static int getloadavg_initialized;
478 /* Offset in kmem to seek to read load average, or 0 means invalid. */
479 static long offset;
481 #if !defined(VMS) && !defined(sgi) && !defined(__linux__)
482 static struct nlist nl[2];
483 #endif /* Not VMS or sgi */
485 #ifdef SUNOS_5
486 static kvm_t *kd;
487 #endif /* SUNOS_5 */
489 #endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
491 /* Put the 1 minute, 5 minute and 15 minute load averages
492 into the first NELEM elements of LOADAVG.
493 Return the number written (never more than 3, but may be less than NELEM),
494 or -1 if an error occurred. */
497 getloadavg (double loadavg[], int nelem)
499 int elem = 0; /* Return value. */
501 # ifdef NO_GET_LOAD_AVG
502 # define LDAV_DONE
503 /* Set errno to zero to indicate that there was no particular error;
504 this function just can't work at all on this system. */
505 errno = 0;
506 elem = -1;
507 # endif
509 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
510 /* Use libkstat because we don't have to be root. */
511 # define LDAV_DONE
512 kstat_ctl_t *kc;
513 kstat_t *ksp;
514 kstat_named_t *kn;
516 kc = kstat_open ();
517 if (kc == 0)
518 return -1;
519 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
520 if (ksp == 0 )
521 return -1;
522 if (kstat_read (kc, ksp, 0) == -1)
523 return -1;
526 kn = kstat_data_lookup (ksp, "avenrun_1min");
527 if (kn == 0)
529 /* Return -1 if no load average information is available. */
530 nelem = 0;
531 elem = -1;
534 if (nelem >= 1)
535 loadavg[elem++] = (double) kn->value.ul/FSCALE;
537 if (nelem >= 2)
539 kn = kstat_data_lookup (ksp, "avenrun_5min");
540 if (kn != 0)
542 loadavg[elem++] = (double) kn->value.ul/FSCALE;
544 if (nelem >= 3)
546 kn = kstat_data_lookup (ksp, "avenrun_15min");
547 if (kn != 0)
548 loadavg[elem++] = (double) kn->value.ul/FSCALE;
553 kstat_close (kc);
554 # endif /* HAVE_LIBKSTAT */
556 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
557 /* Use pstat_getdynamic() because we don't have to be root. */
558 # define LDAV_DONE
559 # undef LOAD_AVE_TYPE
561 struct pst_dynamic dyn_info;
562 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
563 return -1;
564 if (nelem > 0)
565 loadavg[elem++] = dyn_info.psd_avg_1_min;
566 if (nelem > 1)
567 loadavg[elem++] = dyn_info.psd_avg_5_min;
568 if (nelem > 2)
569 loadavg[elem++] = dyn_info.psd_avg_15_min;
571 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
573 # if !defined (LDAV_DONE) && defined (__linux__)
574 # define LDAV_DONE
575 # undef LOAD_AVE_TYPE
577 # ifndef LINUX_LDAV_FILE
578 # define LINUX_LDAV_FILE "/proc/loadavg"
579 # endif
581 char ldavgbuf[40];
582 double load_ave[3];
583 int fd, count;
585 fd = open (LINUX_LDAV_FILE, O_RDONLY);
586 if (fd == -1)
587 return -1;
588 count = read (fd, ldavgbuf, 40);
589 (void) close (fd);
590 if (count <= 0)
591 return -1;
593 /* The following sscanf must use the C locale. */
594 setlocale (LC_NUMERIC, "C");
595 count = sscanf (ldavgbuf, "%lf %lf %lf",
596 &load_ave[0], &load_ave[1], &load_ave[2]);
597 setlocale (LC_NUMERIC, "");
598 if (count < 1)
599 return -1;
601 for (elem = 0; elem < nelem && elem < count; elem++)
602 loadavg[elem] = load_ave[elem];
604 return elem;
606 # endif /* __linux__ */
608 # if !defined (LDAV_DONE) && defined (__NetBSD__)
609 # define LDAV_DONE
610 # undef LOAD_AVE_TYPE
612 # ifndef NETBSD_LDAV_FILE
613 # define NETBSD_LDAV_FILE "/kern/loadavg"
614 # endif
616 unsigned long int load_ave[3], scale;
617 int count;
618 FILE *fp;
620 fp = fopen (NETBSD_LDAV_FILE, "r");
621 if (fp == NULL)
622 return -1;
623 count = fscanf (fp, "%lu %lu %lu %lu\n",
624 &load_ave[0], &load_ave[1], &load_ave[2],
625 &scale);
626 (void) fclose (fp);
627 if (count != 4)
628 return -1;
630 for (elem = 0; elem < nelem; elem++)
631 loadavg[elem] = (double) load_ave[elem] / (double) scale;
633 return elem;
635 # endif /* __NetBSD__ */
637 # if !defined (LDAV_DONE) && defined (NeXT)
638 # define LDAV_DONE
639 /* The NeXT code was adapted from iscreen 3.2. */
641 host_t host;
642 struct processor_set_basic_info info;
643 unsigned info_count;
645 /* We only know how to get the 1-minute average for this system,
646 so even if the caller asks for more than 1, we only return 1. */
648 if (!getloadavg_initialized)
650 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
651 getloadavg_initialized = 1;
654 if (getloadavg_initialized)
656 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
657 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
658 (processor_set_info_t) &info, &info_count)
659 != KERN_SUCCESS)
660 getloadavg_initialized = 0;
661 else
663 if (nelem > 0)
664 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
668 if (!getloadavg_initialized)
669 return -1;
670 # endif /* NeXT */
672 # if !defined (LDAV_DONE) && defined (UMAX)
673 # define LDAV_DONE
674 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
675 have a /dev/kmem. Information about the workings of the running kernel
676 can be gathered with inq_stats system calls.
677 We only know how to get the 1-minute average for this system. */
679 struct proc_summary proc_sum_data;
680 struct stat_descr proc_info;
681 double load;
682 register unsigned int i, j;
684 if (cpus == 0)
686 register unsigned int c, i;
687 struct cpu_config conf;
688 struct stat_descr desc;
690 desc.sd_next = 0;
691 desc.sd_subsys = SUBSYS_CPU;
692 desc.sd_type = CPUTYPE_CONFIG;
693 desc.sd_addr = (char *) &conf;
694 desc.sd_size = sizeof conf;
696 if (inq_stats (1, &desc))
697 return -1;
699 c = 0;
700 for (i = 0; i < conf.config_maxclass; ++i)
702 struct class_stats stats;
703 memset (&stats, '\0', sizeof stats);
705 desc.sd_type = CPUTYPE_CLASS;
706 desc.sd_objid = i;
707 desc.sd_addr = (char *) &stats;
708 desc.sd_size = sizeof stats;
710 if (inq_stats (1, &desc))
711 return -1;
713 c += stats.class_numcpus;
715 cpus = c;
716 samples = cpus < 2 ? 3 : (2 * cpus / 3);
719 proc_info.sd_next = 0;
720 proc_info.sd_subsys = SUBSYS_PROC;
721 proc_info.sd_type = PROCTYPE_SUMMARY;
722 proc_info.sd_addr = (char *) &proc_sum_data;
723 proc_info.sd_size = sizeof (struct proc_summary);
724 proc_info.sd_sizeused = 0;
726 if (inq_stats (1, &proc_info) != 0)
727 return -1;
729 load = proc_sum_data.ps_nrunnable;
730 j = 0;
731 for (i = samples - 1; i > 0; --i)
733 load += proc_sum_data.ps_nrun[j];
734 if (j++ == PS_NRUNSIZE)
735 j = 0;
738 if (nelem > 0)
739 loadavg[elem++] = load / samples / cpus;
740 # endif /* UMAX */
742 # if !defined (LDAV_DONE) && defined (DGUX)
743 # define LDAV_DONE
744 /* This call can return -1 for an error, but with good args
745 it's not supposed to fail. The first argument is for no
746 apparent reason of type 'long int *'. */
747 dg_sys_info ((long int *) &load_info,
748 DG_SYS_INFO_LOAD_INFO_TYPE,
749 DG_SYS_INFO_LOAD_VERSION_0);
751 if (nelem > 0)
752 loadavg[elem++] = load_info.one_minute;
753 if (nelem > 1)
754 loadavg[elem++] = load_info.five_minute;
755 if (nelem > 2)
756 loadavg[elem++] = load_info.fifteen_minute;
757 # endif /* DGUX */
759 # if !defined (LDAV_DONE) && defined (apollo)
760 # define LDAV_DONE
761 /* Apollo code from lisch@mentorg.com (Ray Lischner).
763 This system call is not documented. The load average is obtained as
764 three long integers, for the load average over the past minute,
765 five minutes, and fifteen minutes. Each value is a scaled integer,
766 with 16 bits of integer part and 16 bits of fraction part.
768 I'm not sure which operating system first supported this system call,
769 but I know that SR10.2 supports it. */
771 extern void proc1_$get_loadav ();
772 unsigned long load_ave[3];
774 proc1_$get_loadav (load_ave);
776 if (nelem > 0)
777 loadavg[elem++] = load_ave[0] / 65536.0;
778 if (nelem > 1)
779 loadavg[elem++] = load_ave[1] / 65536.0;
780 if (nelem > 2)
781 loadavg[elem++] = load_ave[2] / 65536.0;
782 # endif /* apollo */
784 # if !defined (LDAV_DONE) && defined (OSF_MIPS)
785 # define LDAV_DONE
787 struct tbl_loadavg load_ave;
788 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
789 loadavg[elem++]
790 = (load_ave.tl_lscale == 0
791 ? load_ave.tl_avenrun.d[0]
792 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
793 # endif /* OSF_MIPS */
795 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
796 # define LDAV_DONE
798 /* A faithful emulation is going to have to be saved for a rainy day. */
799 for ( ; elem < nelem; elem++)
801 loadavg[elem] = 0.0;
803 # endif /* __MSDOS__ || WINDOWS32 */
805 # if !defined (LDAV_DONE) && defined (OSF_ALPHA)
806 # define LDAV_DONE
808 struct tbl_loadavg load_ave;
809 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
810 for (elem = 0; elem < nelem; elem++)
811 loadavg[elem]
812 = (load_ave.tl_lscale == 0
813 ? load_ave.tl_avenrun.d[elem]
814 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
815 # endif /* OSF_ALPHA */
817 # if !defined (LDAV_DONE) && defined (VMS)
818 /* VMS specific code -- read from the Load Ave driver. */
820 LOAD_AVE_TYPE load_ave[3];
821 static int getloadavg_initialized = 0;
822 # ifdef eunice
823 struct
825 int dsc$w_length;
826 char *dsc$a_pointer;
827 } descriptor;
828 # endif
830 /* Ensure that there is a channel open to the load ave device. */
831 if (!getloadavg_initialized)
833 /* Attempt to open the channel. */
834 # ifdef eunice
835 descriptor.dsc$w_length = 18;
836 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
837 # else
838 $DESCRIPTOR (descriptor, "LAV0:");
839 # endif
840 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
841 getloadavg_initialized = 1;
844 /* Read the load average vector. */
845 if (getloadavg_initialized
846 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
847 load_ave, 12, 0, 0, 0, 0) & 1))
849 sys$dassgn (channel);
850 getloadavg_initialized = 0;
853 if (!getloadavg_initialized)
854 return -1;
855 # endif /* VMS */
857 # if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
859 /* UNIX-specific code -- read the average from /dev/kmem. */
861 # define LDAV_PRIVILEGED /* This code requires special installation. */
863 LOAD_AVE_TYPE load_ave[3];
865 /* Get the address of LDAV_SYMBOL. */
866 if (offset == 0)
868 # ifndef sgi
869 # ifndef NLIST_STRUCT
870 strcpy (nl[0].n_name, LDAV_SYMBOL);
871 strcpy (nl[1].n_name, "");
872 # else /* NLIST_STRUCT */
873 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
874 nl[0].n_un.n_name = LDAV_SYMBOL;
875 nl[1].n_un.n_name = 0;
876 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
877 nl[0].n_name = LDAV_SYMBOL;
878 nl[1].n_name = 0;
879 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
880 # endif /* NLIST_STRUCT */
882 # ifndef SUNOS_5
883 if (
884 # if !(defined (_AIX) && !defined (ps2))
885 nlist (KERNEL_FILE, nl)
886 # else /* _AIX */
887 knlist (nl, 1, sizeof (nl[0]))
888 # endif
889 >= 0)
890 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
892 # ifdef FIXUP_KERNEL_SYMBOL_ADDR
893 FIXUP_KERNEL_SYMBOL_ADDR (nl);
894 # endif
895 offset = nl[0].n_value;
897 # endif /* !SUNOS_5 */
898 # else /* sgi */
899 int ldav_off;
901 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
902 if (ldav_off != -1)
903 offset = (long) ldav_off & 0x7fffffff;
904 # endif /* sgi */
907 /* Make sure we have /dev/kmem open. */
908 if (!getloadavg_initialized)
910 # ifndef SUNOS_5
911 channel = open ("/dev/kmem", 0);
912 if (channel >= 0)
914 /* Set the channel to close on exec, so it does not
915 litter any child's descriptor table. */
916 # ifdef F_SETFD
917 # ifndef FD_CLOEXEC
918 # define FD_CLOEXEC 1
919 # endif
920 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
921 # endif
922 getloadavg_initialized = 1;
924 # else /* SUNOS_5 */
925 /* We pass 0 for the kernel, corefile, and swapfile names
926 to use the currently running kernel. */
927 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
928 if (kd != 0)
930 /* nlist the currently running kernel. */
931 kvm_nlist (kd, nl);
932 offset = nl[0].n_value;
933 getloadavg_initialized = 1;
935 # endif /* SUNOS_5 */
938 /* If we can, get the load average values. */
939 if (offset && getloadavg_initialized)
941 /* Try to read the load. */
942 # ifndef SUNOS_5
943 if (lseek (channel, offset, 0) == -1L
944 || read (channel, (char *) load_ave, sizeof (load_ave))
945 != sizeof (load_ave))
947 close (channel);
948 getloadavg_initialized = 0;
950 # else /* SUNOS_5 */
951 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
952 != sizeof (load_ave))
954 kvm_close (kd);
955 getloadavg_initialized = 0;
957 # endif /* SUNOS_5 */
960 if (offset == 0 || !getloadavg_initialized)
961 return -1;
962 # endif /* LOAD_AVE_TYPE and not VMS */
964 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
965 if (nelem > 0)
966 loadavg[elem++] = LDAV_CVT (load_ave[0]);
967 if (nelem > 1)
968 loadavg[elem++] = LDAV_CVT (load_ave[1]);
969 if (nelem > 2)
970 loadavg[elem++] = LDAV_CVT (load_ave[2]);
972 # define LDAV_DONE
973 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */
975 # ifdef LDAV_DONE
976 return elem;
977 # else
978 /* Set errno to zero to indicate that there was no particular error;
979 this function just can't work at all on this system. */
980 errno = 0;
981 return -1;
982 # endif
985 #endif /* ! HAVE_GETLOADAVG */
987 #ifdef TEST
988 #include "make.h"
991 main (int argc, char **argv)
993 int naptime = 0;
995 if (argc > 1)
996 naptime = atoi (argv[1]);
998 while (1)
1000 double avg[3];
1001 int loads;
1003 errno = 0; /* Don't be misled if it doesn't set errno. */
1004 loads = getloadavg (avg, 3);
1005 if (loads == -1)
1007 perror ("Error getting load average");
1008 exit (1);
1010 if (loads > 0)
1011 printf ("1-minute: %f ", avg[0]);
1012 if (loads > 1)
1013 printf ("5-minute: %f ", avg[1]);
1014 if (loads > 2)
1015 printf ("15-minute: %f ", avg[2]);
1016 if (loads > 0)
1017 putchar ('\n');
1019 if (naptime == 0)
1020 break;
1021 sleep (naptime);
1024 exit (0);
1026 #endif /* TEST */