Ensure variables defined in $(call ...) have global scope
[make.git] / getloadavg.c
blobf9d7964c6fb252a5ff7faed27d2cfc301297dee5
1 /* Get the system load averages.
2 Copyright (C) 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
3 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
4 2008, 2009, 2010 Free Software Foundation, Inc.
6 GNU Make is free software; you can redistribute it and/or modify it under the
7 terms of the GNU General Public License as published by the Free Software
8 Foundation; either version 3 of the License, or (at your option) any later
9 version.
11 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along with
16 this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Compile-time symbols that this file uses:
20 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
21 pstat_getdynamic function. I think it
22 is unique to HPUX9. The best way to get the
23 definition is through the AC_FUNC_GETLOADAVG
24 macro that comes with autoconf 2.13 or newer.
25 If that isn't an option, then just put
26 AC_CHECK_FUNCS(pstat_getdynamic) in your
27 configure.in file.
28 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
29 KERNEL_FILE Pathname of the kernel to nlist.
30 LDAV_CVT() Scale the load average from the kernel.
31 Returns a double.
32 LDAV_SYMBOL Name of kernel symbol giving load average.
33 LOAD_AVE_TYPE Type of the load average array in the kernel.
34 Must be defined unless one of
35 apollo, DGUX, NeXT, or UMAX is defined;
36 or we have libkstat;
37 otherwise, no load average is available.
38 NLIST_STRUCT Include nlist.h, not a.out.h, and
39 the nlist n_name element is a pointer,
40 not an array.
41 HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
42 LINUX_LDAV_FILE [__linux__]: File containing load averages.
44 Specific system predefines this file uses, aside from setting
45 default values if not emacs:
47 apollo
48 BSD Real BSD, not just BSD-like.
49 convex
50 DGUX
51 eunice UNIX emulator under VMS.
52 hpux
53 __MSDOS__ No-op for MSDOS.
54 NeXT
55 sgi
56 sequent Sequent Dynix 3.x.x (BSD)
57 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
58 sony_news NEWS-OS (works at least for 4.1C)
59 UMAX
60 UMAX4_3
61 VMS
62 WINDOWS32 No-op for Windows95/NT.
63 __linux__ Linux: assumes /proc filesystem mounted.
64 Support from Michael K. Johnson.
65 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
67 In addition, to avoid nesting many #ifdefs, we internally set
68 LDAV_DONE to indicate that the load average has been computed.
70 We also #define LDAV_PRIVILEGED if a program will require
71 special installation to be able to call getloadavg. */
73 /* This should always be first. */
74 #ifdef HAVE_CONFIG_H
75 # include <config.h>
76 #endif
78 #include <sys/types.h>
80 /* Both the Emacs and non-Emacs sections want this. Some
81 configuration files' definitions for the LOAD_AVE_CVT macro (like
82 sparc.h's) use macros like FSCALE, defined here. */
83 #if defined (unix) || defined (__unix)
84 # include <sys/param.h>
85 #endif
88 /* Exclude all the code except the test program at the end
89 if the system has its own `getloadavg' function.
91 The declaration of `errno' is needed by the test program
92 as well as the function itself, so it comes first. */
94 #include <errno.h>
96 #ifndef errno
97 extern int errno;
98 #endif
100 #if HAVE_LOCALE_H
101 # include <locale.h>
102 #endif
103 #if !HAVE_SETLOCALE
104 # define setlocale(Category, Locale) /* empty */
105 #endif
107 #ifndef HAVE_GETLOADAVG
110 /* The existing Emacs configuration files define a macro called
111 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
112 returns the load average multiplied by 100. What we actually want
113 is a macro called LDAV_CVT, which returns the load average as an
114 unmultiplied double.
116 For backwards compatibility, we'll define LDAV_CVT in terms of
117 LOAD_AVE_CVT, but future machine config files should just define
118 LDAV_CVT directly. */
120 # if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
121 # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
122 # endif
124 # if !defined (BSD) && defined (ultrix)
125 /* Ultrix behaves like BSD on Vaxen. */
126 # define BSD
127 # endif
129 # ifdef NeXT
130 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
131 conflicts with the definition understood in this file, that this
132 really is BSD. */
133 # undef BSD
135 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
136 defined to mean that the nlist method should be used, which is not true. */
137 # undef FSCALE
138 # endif
140 /* Same issues as for NeXT apply to the HURD-based GNU system. */
141 # ifdef __GNU__
142 # undef BSD
143 # undef FSCALE
144 # endif /* __GNU__ */
146 /* Set values that are different from the defaults, which are
147 set a little farther down with #ifndef. */
150 /* Some shorthands. */
152 # if defined (HPUX) && !defined (hpux)
153 # define hpux
154 # endif
156 # if defined (__hpux) && !defined (hpux)
157 # define hpux
158 # endif
160 # if defined (__sun) && !defined (sun)
161 # define sun
162 # endif
164 # if defined(hp300) && !defined(hpux)
165 # define MORE_BSD
166 # endif
168 # if defined(ultrix) && defined(mips)
169 # define decstation
170 # endif
172 # if defined (__SVR4) && !defined (SVR4)
173 # define SVR4
174 # endif
176 # if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
177 # define SUNOS_5
178 # endif
180 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
181 # define OSF_ALPHA
182 # include <sys/mbuf.h>
183 # include <sys/socket.h>
184 # include <net/route.h>
185 # include <sys/table.h>
186 # endif
188 # if defined (__osf__) && (defined (mips) || defined (__mips__))
189 # define OSF_MIPS
190 # include <sys/table.h>
191 # endif
193 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
194 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
195 that with a couple of other things and we'll have a unique match. */
196 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
197 # define tek4300 /* Define by emacs, but not by other users. */
198 # endif
200 /* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
201 # if defined(__QNX__)
202 # undef SVR4
203 # endif
205 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
206 # ifndef LOAD_AVE_TYPE
208 # ifdef MORE_BSD
209 # define LOAD_AVE_TYPE long
210 # endif
212 # ifdef sun
213 # define LOAD_AVE_TYPE long
214 # endif
216 # ifdef decstation
217 # define LOAD_AVE_TYPE long
218 # endif
220 # ifdef _SEQUENT_
221 # define LOAD_AVE_TYPE long
222 # endif
224 # ifdef sgi
225 # define LOAD_AVE_TYPE long
226 # endif
228 # ifdef SVR4
229 # define LOAD_AVE_TYPE long
230 # endif
232 # ifdef sony_news
233 # define LOAD_AVE_TYPE long
234 # endif
236 # ifdef sequent
237 # define LOAD_AVE_TYPE long
238 # endif
240 # ifdef OSF_ALPHA
241 # define LOAD_AVE_TYPE long
242 # endif
244 # if defined (ardent) && defined (titan)
245 # define LOAD_AVE_TYPE long
246 # endif
248 # ifdef tek4300
249 # define LOAD_AVE_TYPE long
250 # endif
252 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
253 # define LOAD_AVE_TYPE long
254 # endif
256 # ifdef _AIX
257 # define LOAD_AVE_TYPE long
258 # endif
260 # ifdef convex
261 # define LOAD_AVE_TYPE double
262 # ifndef LDAV_CVT
263 # define LDAV_CVT(n) (n)
264 # endif
265 # endif
267 # endif /* No LOAD_AVE_TYPE. */
269 # ifdef OSF_ALPHA
270 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
271 according to ghazi@noc.rutgers.edu. */
272 # undef FSCALE
273 # define FSCALE 1024.0
274 # endif
276 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
277 /* <sys/param.h> defines an incorrect value for FSCALE on an
278 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
279 # undef FSCALE
280 # define FSCALE 100.0
281 # endif
284 # ifndef FSCALE
286 /* SunOS and some others define FSCALE in sys/param.h. */
288 # ifdef MORE_BSD
289 # define FSCALE 2048.0
290 # endif
292 # if defined(MIPS) || defined(SVR4) || defined(decstation)
293 # define FSCALE 256
294 # endif
296 # if defined (sgi) || defined (sequent)
297 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
298 above under #ifdef MIPS. But we want the sgi value. */
299 # undef FSCALE
300 # define FSCALE 1000.0
301 # endif
303 # if defined (ardent) && defined (titan)
304 # define FSCALE 65536.0
305 # endif
307 # ifdef tek4300
308 # define FSCALE 100.0
309 # endif
311 # ifdef _AIX
312 # define FSCALE 65536.0
313 # endif
315 # endif /* Not FSCALE. */
317 # if !defined (LDAV_CVT) && defined (FSCALE)
318 # define LDAV_CVT(n) (((double) (n)) / FSCALE)
319 # endif
322 # if defined(sgi) || (defined(mips) && !defined(BSD))
323 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
324 # endif
327 # if !defined (KERNEL_FILE) && defined (sequent)
328 # define KERNEL_FILE "/dynix"
329 # endif
331 # if !defined (KERNEL_FILE) && defined (hpux)
332 # define KERNEL_FILE "/hp-ux"
333 # endif
335 # if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
336 # define KERNEL_FILE "/unix"
337 # endif
340 # if !defined (LDAV_SYMBOL) && defined (alliant)
341 # define LDAV_SYMBOL "_Loadavg"
342 # endif
344 # if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
345 # define LDAV_SYMBOL "avenrun"
346 # endif
348 # ifdef HAVE_UNISTD_H
349 # include <unistd.h>
350 # endif
352 # include <stdio.h>
354 /* LOAD_AVE_TYPE should only get defined if we're going to use the
355 nlist method. */
356 # if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) && !defined(__riscos__)
357 # define LOAD_AVE_TYPE double
358 # endif
360 # ifdef LOAD_AVE_TYPE
362 # ifndef VMS
363 # ifndef __linux__
364 # ifdef HAVE_NLIST_H
365 # include <nlist.h>
366 # else
367 # include <a.out.h>
368 # endif
370 # ifdef SUNOS_5
371 # include <fcntl.h>
372 # include <kvm.h>
373 # include <kstat.h>
374 # endif
376 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
377 # include <sys/pstat.h>
378 # endif
380 # ifndef KERNEL_FILE
381 # define KERNEL_FILE "/vmunix"
382 # endif /* KERNEL_FILE */
384 # ifndef LDAV_SYMBOL
385 # define LDAV_SYMBOL "_avenrun"
386 # endif /* LDAV_SYMBOL */
387 # endif /* __linux__ */
389 # else /* VMS */
391 # ifndef eunice
392 # include <iodef.h>
393 # include <descrip.h>
394 # else /* eunice */
395 # include <vms/iodef.h>
396 # endif /* eunice */
397 # endif /* VMS */
399 # ifndef LDAV_CVT
400 # define LDAV_CVT(n) ((double) (n))
401 # endif /* !LDAV_CVT */
403 # endif /* LOAD_AVE_TYPE */
405 # if defined(__GNU__) && !defined (NeXT)
406 /* Note that NeXT Openstep defines __GNU__ even though it should not. */
407 /* GNU system acts much like NeXT, for load average purposes,
408 but not exactly. */
409 # define NeXT
410 # define host_self mach_host_self
411 # endif
413 # ifdef NeXT
414 # ifdef HAVE_MACH_MACH_H
415 # include <mach/mach.h>
416 # else
417 # include <mach.h>
418 # endif
419 # endif /* NeXT */
421 # ifdef sgi
422 # include <sys/sysmp.h>
423 # endif /* sgi */
425 # ifdef UMAX
426 # include <stdio.h>
427 # include <signal.h>
428 # include <sys/time.h>
429 # include <sys/wait.h>
430 # include <sys/syscall.h>
432 # ifdef UMAX_43
433 # include <machine/cpu.h>
434 # include <inq_stats/statistics.h>
435 # include <inq_stats/sysstats.h>
436 # include <inq_stats/cpustats.h>
437 # include <inq_stats/procstats.h>
438 # else /* Not UMAX_43. */
439 # include <sys/sysdefs.h>
440 # include <sys/statistics.h>
441 # include <sys/sysstats.h>
442 # include <sys/cpudefs.h>
443 # include <sys/cpustats.h>
444 # include <sys/procstats.h>
445 # endif /* Not UMAX_43. */
446 # endif /* UMAX */
448 # ifdef DGUX
449 # include <sys/dg_sys_info.h>
450 # endif
452 # if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
453 # include <fcntl.h>
454 # else
455 # include <sys/file.h>
456 # endif
459 /* Avoid static vars inside a function since in HPUX they dump as pure. */
461 # ifdef NeXT
462 static processor_set_t default_set;
463 static int getloadavg_initialized;
464 # endif /* NeXT */
466 # ifdef UMAX
467 static unsigned int cpus = 0;
468 static unsigned int samples;
469 # endif /* UMAX */
471 # ifdef DGUX
472 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
473 # endif /* DGUX */
475 #if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
476 /* File descriptor open to /dev/kmem or VMS load ave driver. */
477 static int channel;
478 /* Nonzero iff channel is valid. */
479 static int getloadavg_initialized;
480 /* Offset in kmem to seek to read load average, or 0 means invalid. */
481 static long offset;
483 #if !defined(VMS) && !defined(sgi) && !defined(__linux__)
484 static struct nlist nl[2];
485 #endif /* Not VMS or sgi */
487 #ifdef SUNOS_5
488 static kvm_t *kd;
489 #endif /* SUNOS_5 */
491 #endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
493 /* Put the 1 minute, 5 minute and 15 minute load averages
494 into the first NELEM elements of LOADAVG.
495 Return the number written (never more than 3, but may be less than NELEM),
496 or -1 if an error occurred. */
499 getloadavg (double loadavg[], int nelem)
501 int elem = 0; /* Return value. */
503 # ifdef NO_GET_LOAD_AVG
504 # define LDAV_DONE
505 /* Set errno to zero to indicate that there was no particular error;
506 this function just can't work at all on this system. */
507 errno = 0;
508 elem = -1;
509 # endif
511 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
512 /* Use libkstat because we don't have to be root. */
513 # define LDAV_DONE
514 kstat_ctl_t *kc;
515 kstat_t *ksp;
516 kstat_named_t *kn;
518 kc = kstat_open ();
519 if (kc == 0)
520 return -1;
521 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
522 if (ksp == 0 )
523 return -1;
524 if (kstat_read (kc, ksp, 0) == -1)
525 return -1;
528 kn = kstat_data_lookup (ksp, "avenrun_1min");
529 if (kn == 0)
531 /* Return -1 if no load average information is available. */
532 nelem = 0;
533 elem = -1;
536 if (nelem >= 1)
537 loadavg[elem++] = (double) kn->value.ul/FSCALE;
539 if (nelem >= 2)
541 kn = kstat_data_lookup (ksp, "avenrun_5min");
542 if (kn != 0)
544 loadavg[elem++] = (double) kn->value.ul/FSCALE;
546 if (nelem >= 3)
548 kn = kstat_data_lookup (ksp, "avenrun_15min");
549 if (kn != 0)
550 loadavg[elem++] = (double) kn->value.ul/FSCALE;
555 kstat_close (kc);
556 # endif /* HAVE_LIBKSTAT */
558 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
559 /* Use pstat_getdynamic() because we don't have to be root. */
560 # define LDAV_DONE
561 # undef LOAD_AVE_TYPE
563 struct pst_dynamic dyn_info;
564 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
565 return -1;
566 if (nelem > 0)
567 loadavg[elem++] = dyn_info.psd_avg_1_min;
568 if (nelem > 1)
569 loadavg[elem++] = dyn_info.psd_avg_5_min;
570 if (nelem > 2)
571 loadavg[elem++] = dyn_info.psd_avg_15_min;
573 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
575 # if !defined (LDAV_DONE) && defined (__linux__)
576 # define LDAV_DONE
577 # undef LOAD_AVE_TYPE
579 # ifndef LINUX_LDAV_FILE
580 # define LINUX_LDAV_FILE "/proc/loadavg"
581 # endif
583 char ldavgbuf[40];
584 double load_ave[3];
585 int fd, count;
587 fd = open (LINUX_LDAV_FILE, O_RDONLY);
588 if (fd == -1)
589 return -1;
590 count = read (fd, ldavgbuf, 40);
591 (void) close (fd);
592 if (count <= 0)
593 return -1;
595 /* The following sscanf must use the C locale. */
596 setlocale (LC_NUMERIC, "C");
597 count = sscanf (ldavgbuf, "%lf %lf %lf",
598 &load_ave[0], &load_ave[1], &load_ave[2]);
599 setlocale (LC_NUMERIC, "");
600 if (count < 1)
601 return -1;
603 for (elem = 0; elem < nelem && elem < count; elem++)
604 loadavg[elem] = load_ave[elem];
606 return elem;
608 # endif /* __linux__ */
610 # if !defined (LDAV_DONE) && defined (__NetBSD__)
611 # define LDAV_DONE
612 # undef LOAD_AVE_TYPE
614 # ifndef NETBSD_LDAV_FILE
615 # define NETBSD_LDAV_FILE "/kern/loadavg"
616 # endif
618 unsigned long int load_ave[3], scale;
619 int count;
620 FILE *fp;
622 fp = fopen (NETBSD_LDAV_FILE, "r");
623 if (fp == NULL)
624 return -1;
625 count = fscanf (fp, "%lu %lu %lu %lu\n",
626 &load_ave[0], &load_ave[1], &load_ave[2],
627 &scale);
628 (void) fclose (fp);
629 if (count != 4)
630 return -1;
632 for (elem = 0; elem < nelem; elem++)
633 loadavg[elem] = (double) load_ave[elem] / (double) scale;
635 return elem;
637 # endif /* __NetBSD__ */
639 # if !defined (LDAV_DONE) && defined (NeXT)
640 # define LDAV_DONE
641 /* The NeXT code was adapted from iscreen 3.2. */
643 host_t host;
644 struct processor_set_basic_info info;
645 unsigned info_count;
647 /* We only know how to get the 1-minute average for this system,
648 so even if the caller asks for more than 1, we only return 1. */
650 if (!getloadavg_initialized)
652 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
653 getloadavg_initialized = 1;
656 if (getloadavg_initialized)
658 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
659 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
660 (processor_set_info_t) &info, &info_count)
661 != KERN_SUCCESS)
662 getloadavg_initialized = 0;
663 else
665 if (nelem > 0)
666 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
670 if (!getloadavg_initialized)
671 return -1;
672 # endif /* NeXT */
674 # if !defined (LDAV_DONE) && defined (UMAX)
675 # define LDAV_DONE
676 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
677 have a /dev/kmem. Information about the workings of the running kernel
678 can be gathered with inq_stats system calls.
679 We only know how to get the 1-minute average for this system. */
681 struct proc_summary proc_sum_data;
682 struct stat_descr proc_info;
683 double load;
684 register unsigned int i, j;
686 if (cpus == 0)
688 register unsigned int c, i;
689 struct cpu_config conf;
690 struct stat_descr desc;
692 desc.sd_next = 0;
693 desc.sd_subsys = SUBSYS_CPU;
694 desc.sd_type = CPUTYPE_CONFIG;
695 desc.sd_addr = (char *) &conf;
696 desc.sd_size = sizeof conf;
698 if (inq_stats (1, &desc))
699 return -1;
701 c = 0;
702 for (i = 0; i < conf.config_maxclass; ++i)
704 struct class_stats stats;
705 memset (&stats, '\0', sizeof stats);
707 desc.sd_type = CPUTYPE_CLASS;
708 desc.sd_objid = i;
709 desc.sd_addr = (char *) &stats;
710 desc.sd_size = sizeof stats;
712 if (inq_stats (1, &desc))
713 return -1;
715 c += stats.class_numcpus;
717 cpus = c;
718 samples = cpus < 2 ? 3 : (2 * cpus / 3);
721 proc_info.sd_next = 0;
722 proc_info.sd_subsys = SUBSYS_PROC;
723 proc_info.sd_type = PROCTYPE_SUMMARY;
724 proc_info.sd_addr = (char *) &proc_sum_data;
725 proc_info.sd_size = sizeof (struct proc_summary);
726 proc_info.sd_sizeused = 0;
728 if (inq_stats (1, &proc_info) != 0)
729 return -1;
731 load = proc_sum_data.ps_nrunnable;
732 j = 0;
733 for (i = samples - 1; i > 0; --i)
735 load += proc_sum_data.ps_nrun[j];
736 if (j++ == PS_NRUNSIZE)
737 j = 0;
740 if (nelem > 0)
741 loadavg[elem++] = load / samples / cpus;
742 # endif /* UMAX */
744 # if !defined (LDAV_DONE) && defined (DGUX)
745 # define LDAV_DONE
746 /* This call can return -1 for an error, but with good args
747 it's not supposed to fail. The first argument is for no
748 apparent reason of type `long int *'. */
749 dg_sys_info ((long int *) &load_info,
750 DG_SYS_INFO_LOAD_INFO_TYPE,
751 DG_SYS_INFO_LOAD_VERSION_0);
753 if (nelem > 0)
754 loadavg[elem++] = load_info.one_minute;
755 if (nelem > 1)
756 loadavg[elem++] = load_info.five_minute;
757 if (nelem > 2)
758 loadavg[elem++] = load_info.fifteen_minute;
759 # endif /* DGUX */
761 # if !defined (LDAV_DONE) && defined (apollo)
762 # define LDAV_DONE
763 /* Apollo code from lisch@mentorg.com (Ray Lischner).
765 This system call is not documented. The load average is obtained as
766 three long integers, for the load average over the past minute,
767 five minutes, and fifteen minutes. Each value is a scaled integer,
768 with 16 bits of integer part and 16 bits of fraction part.
770 I'm not sure which operating system first supported this system call,
771 but I know that SR10.2 supports it. */
773 extern void proc1_$get_loadav ();
774 unsigned long load_ave[3];
776 proc1_$get_loadav (load_ave);
778 if (nelem > 0)
779 loadavg[elem++] = load_ave[0] / 65536.0;
780 if (nelem > 1)
781 loadavg[elem++] = load_ave[1] / 65536.0;
782 if (nelem > 2)
783 loadavg[elem++] = load_ave[2] / 65536.0;
784 # endif /* apollo */
786 # if !defined (LDAV_DONE) && defined (OSF_MIPS)
787 # define LDAV_DONE
789 struct tbl_loadavg load_ave;
790 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
791 loadavg[elem++]
792 = (load_ave.tl_lscale == 0
793 ? load_ave.tl_avenrun.d[0]
794 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
795 # endif /* OSF_MIPS */
797 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
798 # define LDAV_DONE
800 /* A faithful emulation is going to have to be saved for a rainy day. */
801 for ( ; elem < nelem; elem++)
803 loadavg[elem] = 0.0;
805 # endif /* __MSDOS__ || WINDOWS32 */
807 # if !defined (LDAV_DONE) && defined (OSF_ALPHA)
808 # define LDAV_DONE
810 struct tbl_loadavg load_ave;
811 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
812 for (elem = 0; elem < nelem; elem++)
813 loadavg[elem]
814 = (load_ave.tl_lscale == 0
815 ? load_ave.tl_avenrun.d[elem]
816 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
817 # endif /* OSF_ALPHA */
819 # if !defined (LDAV_DONE) && defined (VMS)
820 /* VMS specific code -- read from the Load Ave driver. */
822 LOAD_AVE_TYPE load_ave[3];
823 static int getloadavg_initialized = 0;
824 # ifdef eunice
825 struct
827 int dsc$w_length;
828 char *dsc$a_pointer;
829 } descriptor;
830 # endif
832 /* Ensure that there is a channel open to the load ave device. */
833 if (!getloadavg_initialized)
835 /* Attempt to open the channel. */
836 # ifdef eunice
837 descriptor.dsc$w_length = 18;
838 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
839 # else
840 $DESCRIPTOR (descriptor, "LAV0:");
841 # endif
842 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
843 getloadavg_initialized = 1;
846 /* Read the load average vector. */
847 if (getloadavg_initialized
848 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
849 load_ave, 12, 0, 0, 0, 0) & 1))
851 sys$dassgn (channel);
852 getloadavg_initialized = 0;
855 if (!getloadavg_initialized)
856 return -1;
857 # endif /* VMS */
859 # if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
861 /* UNIX-specific code -- read the average from /dev/kmem. */
863 # define LDAV_PRIVILEGED /* This code requires special installation. */
865 LOAD_AVE_TYPE load_ave[3];
867 /* Get the address of LDAV_SYMBOL. */
868 if (offset == 0)
870 # ifndef sgi
871 # ifndef NLIST_STRUCT
872 strcpy (nl[0].n_name, LDAV_SYMBOL);
873 strcpy (nl[1].n_name, "");
874 # else /* NLIST_STRUCT */
875 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
876 nl[0].n_un.n_name = LDAV_SYMBOL;
877 nl[1].n_un.n_name = 0;
878 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
879 nl[0].n_name = LDAV_SYMBOL;
880 nl[1].n_name = 0;
881 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
882 # endif /* NLIST_STRUCT */
884 # ifndef SUNOS_5
885 if (
886 # if !(defined (_AIX) && !defined (ps2))
887 nlist (KERNEL_FILE, nl)
888 # else /* _AIX */
889 knlist (nl, 1, sizeof (nl[0]))
890 # endif
891 >= 0)
892 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
894 # ifdef FIXUP_KERNEL_SYMBOL_ADDR
895 FIXUP_KERNEL_SYMBOL_ADDR (nl);
896 # endif
897 offset = nl[0].n_value;
899 # endif /* !SUNOS_5 */
900 # else /* sgi */
901 int ldav_off;
903 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
904 if (ldav_off != -1)
905 offset = (long) ldav_off & 0x7fffffff;
906 # endif /* sgi */
909 /* Make sure we have /dev/kmem open. */
910 if (!getloadavg_initialized)
912 # ifndef SUNOS_5
913 channel = open ("/dev/kmem", 0);
914 if (channel >= 0)
916 /* Set the channel to close on exec, so it does not
917 litter any child's descriptor table. */
918 # ifdef F_SETFD
919 # ifndef FD_CLOEXEC
920 # define FD_CLOEXEC 1
921 # endif
922 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
923 # endif
924 getloadavg_initialized = 1;
926 # else /* SUNOS_5 */
927 /* We pass 0 for the kernel, corefile, and swapfile names
928 to use the currently running kernel. */
929 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
930 if (kd != 0)
932 /* nlist the currently running kernel. */
933 kvm_nlist (kd, nl);
934 offset = nl[0].n_value;
935 getloadavg_initialized = 1;
937 # endif /* SUNOS_5 */
940 /* If we can, get the load average values. */
941 if (offset && getloadavg_initialized)
943 /* Try to read the load. */
944 # ifndef SUNOS_5
945 if (lseek (channel, offset, 0) == -1L
946 || read (channel, (char *) load_ave, sizeof (load_ave))
947 != sizeof (load_ave))
949 close (channel);
950 getloadavg_initialized = 0;
952 # else /* SUNOS_5 */
953 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
954 != sizeof (load_ave))
956 kvm_close (kd);
957 getloadavg_initialized = 0;
959 # endif /* SUNOS_5 */
962 if (offset == 0 || !getloadavg_initialized)
963 return -1;
964 # endif /* LOAD_AVE_TYPE and not VMS */
966 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
967 if (nelem > 0)
968 loadavg[elem++] = LDAV_CVT (load_ave[0]);
969 if (nelem > 1)
970 loadavg[elem++] = LDAV_CVT (load_ave[1]);
971 if (nelem > 2)
972 loadavg[elem++] = LDAV_CVT (load_ave[2]);
974 # define LDAV_DONE
975 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */
977 # ifdef LDAV_DONE
978 return elem;
979 # else
980 /* Set errno to zero to indicate that there was no particular error;
981 this function just can't work at all on this system. */
982 errno = 0;
983 return -1;
984 # endif
987 #endif /* ! HAVE_GETLOADAVG */
989 #ifdef TEST
990 #include "make.h"
993 main (int argc, char **argv)
995 int naptime = 0;
997 if (argc > 1)
998 naptime = atoi (argv[1]);
1000 while (1)
1002 double avg[3];
1003 int loads;
1005 errno = 0; /* Don't be misled if it doesn't set errno. */
1006 loads = getloadavg (avg, 3);
1007 if (loads == -1)
1009 perror ("Error getting load average");
1010 exit (1);
1012 if (loads > 0)
1013 printf ("1-minute: %f ", avg[0]);
1014 if (loads > 1)
1015 printf ("5-minute: %f ", avg[1]);
1016 if (loads > 2)
1017 printf ("15-minute: %f ", avg[2]);
1018 if (loads > 0)
1019 putchar ('\n');
1021 if (naptime == 0)
1022 break;
1023 sleep (naptime);
1026 exit (0);
1028 #endif /* TEST */