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Diffstat (limited to 'gl/getloadavg.c')
-rw-r--r-- | gl/getloadavg.c | 1020 |
1 files changed, 1020 insertions, 0 deletions
diff --git a/gl/getloadavg.c b/gl/getloadavg.c new file mode 100644 index 00000000..cfa62735 --- /dev/null +++ b/gl/getloadavg.c | |||
@@ -0,0 +1,1020 @@ | |||
1 | /* Get the system load averages. | ||
2 | |||
3 | Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994, | ||
4 | 1995, 1997, 1999, 2000, 2003, 2004, 2005, 2006 Free Software | ||
5 | Foundation, Inc. | ||
6 | |||
7 | NOTE: The canonical source of this file is maintained with gnulib. | ||
8 | Bugs can be reported to bug-gnulib@gnu.org. | ||
9 | |||
10 | This program is free software; you can redistribute it and/or modify | ||
11 | it under the terms of the GNU General Public License as published by | ||
12 | the Free Software Foundation; either version 2, or (at your option) | ||
13 | any later version. | ||
14 | |||
15 | This program is distributed in the hope that it will be useful, | ||
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
18 | GNU General Public License for more details. | ||
19 | |||
20 | You should have received a copy of the GNU General Public License | ||
21 | along with this program; if not, write to the Free Software | ||
22 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, | ||
23 | USA. */ | ||
24 | |||
25 | /* Compile-time symbols that this file uses: | ||
26 | |||
27 | HAVE_PSTAT_GETDYNAMIC Define this if your system has the | ||
28 | pstat_getdynamic function. I think it | ||
29 | is unique to HPUX9. The best way to get the | ||
30 | definition is through the AC_FUNC_GETLOADAVG | ||
31 | macro that comes with autoconf 2.13 or newer. | ||
32 | If that isn't an option, then just put | ||
33 | AC_CHECK_FUNCS(pstat_getdynamic) in your | ||
34 | configure.in file. | ||
35 | FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. | ||
36 | KERNEL_FILE Name of the kernel file to nlist. | ||
37 | LDAV_CVT() Scale the load average from the kernel. | ||
38 | Returns a double. | ||
39 | LDAV_SYMBOL Name of kernel symbol giving load average. | ||
40 | LOAD_AVE_TYPE Type of the load average array in the kernel. | ||
41 | Must be defined unless one of | ||
42 | apollo, DGUX, NeXT, or UMAX is defined; | ||
43 | or we have libkstat; | ||
44 | otherwise, no load average is available. | ||
45 | HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults | ||
46 | to this. | ||
47 | NLIST_STRUCT Include nlist.h, not a.out.h, and | ||
48 | the nlist n_name element is a pointer, | ||
49 | not an array. | ||
50 | HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'. | ||
51 | LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing | ||
52 | load averages. | ||
53 | |||
54 | Specific system predefines this file uses, aside from setting | ||
55 | default values if not emacs: | ||
56 | |||
57 | apollo | ||
58 | BSD Real BSD, not just BSD-like. | ||
59 | convex | ||
60 | DGUX | ||
61 | eunice UNIX emulator under VMS. | ||
62 | hpux | ||
63 | __MSDOS__ No-op for MSDOS. | ||
64 | NeXT | ||
65 | sgi | ||
66 | sequent Sequent Dynix 3.x.x (BSD) | ||
67 | _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) | ||
68 | sony_news NEWS-OS (works at least for 4.1C) | ||
69 | UMAX | ||
70 | UMAX4_3 | ||
71 | VMS | ||
72 | WINDOWS32 No-op for Windows95/NT. | ||
73 | __linux__ Linux: assumes /proc file system mounted. | ||
74 | Support from Michael K. Johnson. | ||
75 | __CYGWIN__ Cygwin emulates linux /proc/loadavg. | ||
76 | __NetBSD__ NetBSD: assumes /kern file system mounted. | ||
77 | |||
78 | In addition, to avoid nesting many #ifdefs, we internally set | ||
79 | LDAV_DONE to indicate that the load average has been computed. | ||
80 | |||
81 | We also #define LDAV_PRIVILEGED if a program will require | ||
82 | special installation to be able to call getloadavg. */ | ||
83 | |||
84 | /* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems | ||
85 | with partially-configured source directories. */ | ||
86 | |||
87 | #ifndef CONFIGURING_GETLOADAVG | ||
88 | # include <config.h> | ||
89 | # include <stdbool.h> | ||
90 | #endif | ||
91 | |||
92 | #include <errno.h> | ||
93 | #include <stdio.h> | ||
94 | #include <stdlib.h> | ||
95 | |||
96 | /* Exclude all the code except the test program at the end | ||
97 | if the system has its own `getloadavg' function. */ | ||
98 | |||
99 | #ifndef HAVE_GETLOADAVG | ||
100 | |||
101 | # include <sys/types.h> | ||
102 | |||
103 | /* Both the Emacs and non-Emacs sections want this. Some | ||
104 | configuration files' definitions for the LOAD_AVE_CVT macro (like | ||
105 | sparc.h's) use macros like FSCALE, defined here. */ | ||
106 | # if defined (unix) || defined (__unix) | ||
107 | # include <sys/param.h> | ||
108 | # endif | ||
109 | |||
110 | # include "c-strtod.h" | ||
111 | # include "cloexec.h" | ||
112 | # include "intprops.h" | ||
113 | # include "xalloc.h" | ||
114 | |||
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. | ||
120 | |||
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. */ | ||
124 | |||
125 | # if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT) | ||
126 | # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) | ||
127 | # endif | ||
128 | |||
129 | # if !defined (BSD) && defined (ultrix) | ||
130 | /* Ultrix behaves like BSD on Vaxen. */ | ||
131 | # define BSD | ||
132 | # endif | ||
133 | |||
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 | ||
139 | |||
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 | ||
144 | |||
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__ */ | ||
150 | |||
151 | /* Set values that are different from the defaults, which are | ||
152 | set a little farther down with #ifndef. */ | ||
153 | |||
154 | |||
155 | /* Some shorthands. */ | ||
156 | |||
157 | # if defined (HPUX) && !defined (hpux) | ||
158 | # define hpux | ||
159 | # endif | ||
160 | |||
161 | # if defined (__hpux) && !defined (hpux) | ||
162 | # define hpux | ||
163 | # endif | ||
164 | |||
165 | # if defined (__sun) && !defined (sun) | ||
166 | # define sun | ||
167 | # endif | ||
168 | |||
169 | # if defined (hp300) && !defined (hpux) | ||
170 | # define MORE_BSD | ||
171 | # endif | ||
172 | |||
173 | # if defined (ultrix) && defined (mips) | ||
174 | # define decstation | ||
175 | # endif | ||
176 | |||
177 | # if defined (__SVR4) && !defined (SVR4) | ||
178 | # define SVR4 | ||
179 | # endif | ||
180 | |||
181 | # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) | ||
182 | # define SUNOS_5 | ||
183 | # endif | ||
184 | |||
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 | # endif | ||
192 | |||
193 | # if defined (__osf__) && (defined (mips) || defined (__mips__)) | ||
194 | # define OSF_MIPS | ||
195 | # include <sys/table.h> | ||
196 | # endif | ||
197 | |||
198 | /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by | ||
199 | default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine | ||
200 | that with a couple of other things and we'll have a unique match. */ | ||
201 | # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) | ||
202 | # define tek4300 /* Define by emacs, but not by other users. */ | ||
203 | # endif | ||
204 | |||
205 | |||
206 | /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ | ||
207 | # ifndef LOAD_AVE_TYPE | ||
208 | |||
209 | # ifdef MORE_BSD | ||
210 | # define LOAD_AVE_TYPE long | ||
211 | # endif | ||
212 | |||
213 | # ifdef sun | ||
214 | # define LOAD_AVE_TYPE long | ||
215 | # endif | ||
216 | |||
217 | # ifdef decstation | ||
218 | # define LOAD_AVE_TYPE long | ||
219 | # endif | ||
220 | |||
221 | # ifdef _SEQUENT_ | ||
222 | # define LOAD_AVE_TYPE long | ||
223 | # endif | ||
224 | |||
225 | # ifdef sgi | ||
226 | # define LOAD_AVE_TYPE long | ||
227 | # endif | ||
228 | |||
229 | # ifdef SVR4 | ||
230 | # define LOAD_AVE_TYPE long | ||
231 | # endif | ||
232 | |||
233 | # ifdef sony_news | ||
234 | # define LOAD_AVE_TYPE long | ||
235 | # endif | ||
236 | |||
237 | # ifdef sequent | ||
238 | # define LOAD_AVE_TYPE long | ||
239 | # endif | ||
240 | |||
241 | # ifdef OSF_ALPHA | ||
242 | # define LOAD_AVE_TYPE long | ||
243 | # endif | ||
244 | |||
245 | # if defined (ardent) && defined (titan) | ||
246 | # define LOAD_AVE_TYPE long | ||
247 | # endif | ||
248 | |||
249 | # ifdef tek4300 | ||
250 | # define LOAD_AVE_TYPE long | ||
251 | # endif | ||
252 | |||
253 | # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ | ||
254 | # define LOAD_AVE_TYPE long | ||
255 | # endif | ||
256 | |||
257 | # ifdef _AIX | ||
258 | # define LOAD_AVE_TYPE long | ||
259 | # endif | ||
260 | |||
261 | # ifdef convex | ||
262 | # define LOAD_AVE_TYPE double | ||
263 | # ifndef LDAV_CVT | ||
264 | # define LDAV_CVT(n) (n) | ||
265 | # endif | ||
266 | # endif | ||
267 | |||
268 | # endif /* No LOAD_AVE_TYPE. */ | ||
269 | |||
270 | # ifdef OSF_ALPHA | ||
271 | /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, | ||
272 | according to ghazi@noc.rutgers.edu. */ | ||
273 | # undef FSCALE | ||
274 | # define FSCALE 1024.0 | ||
275 | # endif | ||
276 | |||
277 | # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ | ||
278 | /* <sys/param.h> defines an incorrect value for FSCALE on an | ||
279 | Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */ | ||
280 | # undef FSCALE | ||
281 | # define FSCALE 100.0 | ||
282 | # endif | ||
283 | |||
284 | |||
285 | # ifndef FSCALE | ||
286 | |||
287 | /* SunOS and some others define FSCALE in sys/param.h. */ | ||
288 | |||
289 | # ifdef MORE_BSD | ||
290 | # define FSCALE 2048.0 | ||
291 | # endif | ||
292 | |||
293 | # if defined (MIPS) || defined (SVR4) || defined (decstation) | ||
294 | # define FSCALE 256 | ||
295 | # endif | ||
296 | |||
297 | # if defined (sgi) || defined (sequent) | ||
298 | /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined | ||
299 | above under #ifdef MIPS. But we want the sgi value. */ | ||
300 | # undef FSCALE | ||
301 | # define FSCALE 1000.0 | ||
302 | # endif | ||
303 | |||
304 | # if defined (ardent) && defined (titan) | ||
305 | # define FSCALE 65536.0 | ||
306 | # endif | ||
307 | |||
308 | # ifdef tek4300 | ||
309 | # define FSCALE 100.0 | ||
310 | # endif | ||
311 | |||
312 | # ifdef _AIX | ||
313 | # define FSCALE 65536.0 | ||
314 | # endif | ||
315 | |||
316 | # endif /* Not FSCALE. */ | ||
317 | |||
318 | # if !defined (LDAV_CVT) && defined (FSCALE) | ||
319 | # define LDAV_CVT(n) (((double) (n)) / FSCALE) | ||
320 | # endif | ||
321 | |||
322 | # ifndef NLIST_STRUCT | ||
323 | # if HAVE_NLIST_H | ||
324 | # define NLIST_STRUCT | ||
325 | # endif | ||
326 | # endif | ||
327 | |||
328 | # if defined (sgi) || (defined (mips) && !defined (BSD)) | ||
329 | # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) | ||
330 | # endif | ||
331 | |||
332 | |||
333 | # if !defined (KERNEL_FILE) && defined (sequent) | ||
334 | # define KERNEL_FILE "/dynix" | ||
335 | # endif | ||
336 | |||
337 | # if !defined (KERNEL_FILE) && defined (hpux) | ||
338 | # define KERNEL_FILE "/hp-ux" | ||
339 | # endif | ||
340 | |||
341 | # if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan))) | ||
342 | # define KERNEL_FILE "/unix" | ||
343 | # endif | ||
344 | |||
345 | |||
346 | # if !defined (LDAV_SYMBOL) && defined (alliant) | ||
347 | # define LDAV_SYMBOL "_Loadavg" | ||
348 | # endif | ||
349 | |||
350 | # if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || defined (_AIX)) | ||
351 | # define LDAV_SYMBOL "avenrun" | ||
352 | # endif | ||
353 | |||
354 | # include <unistd.h> | ||
355 | |||
356 | /* LOAD_AVE_TYPE should only get defined if we're going to use the | ||
357 | nlist method. */ | ||
358 | # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL)) | ||
359 | # define LOAD_AVE_TYPE double | ||
360 | # endif | ||
361 | |||
362 | # ifdef LOAD_AVE_TYPE | ||
363 | |||
364 | # ifndef __VMS | ||
365 | # ifndef __linux__ | ||
366 | # ifndef NLIST_STRUCT | ||
367 | # include <a.out.h> | ||
368 | # else /* NLIST_STRUCT */ | ||
369 | # include <nlist.h> | ||
370 | # endif /* NLIST_STRUCT */ | ||
371 | |||
372 | # ifdef SUNOS_5 | ||
373 | # include <fcntl.h> | ||
374 | # include <kvm.h> | ||
375 | # include <kstat.h> | ||
376 | # endif | ||
377 | |||
378 | # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) | ||
379 | # include <sys/pstat.h> | ||
380 | # endif | ||
381 | |||
382 | # ifndef KERNEL_FILE | ||
383 | # define KERNEL_FILE "/vmunix" | ||
384 | # endif /* KERNEL_FILE */ | ||
385 | |||
386 | # ifndef LDAV_SYMBOL | ||
387 | # define LDAV_SYMBOL "_avenrun" | ||
388 | # endif /* LDAV_SYMBOL */ | ||
389 | # endif /* __linux__ */ | ||
390 | |||
391 | # else /* __VMS */ | ||
392 | |||
393 | # ifndef eunice | ||
394 | # include <iodef.h> | ||
395 | # include <descrip.h> | ||
396 | # else /* eunice */ | ||
397 | # include <vms/iodef.h> | ||
398 | # endif /* eunice */ | ||
399 | # endif /* __VMS */ | ||
400 | |||
401 | # ifndef LDAV_CVT | ||
402 | # define LDAV_CVT(n) ((double) (n)) | ||
403 | # endif /* !LDAV_CVT */ | ||
404 | |||
405 | # endif /* LOAD_AVE_TYPE */ | ||
406 | |||
407 | # if defined (__GNU__) && !defined (NeXT) | ||
408 | /* Note that NeXT Openstep defines __GNU__ even though it should not. */ | ||
409 | /* GNU system acts much like NeXT, for load average purposes, | ||
410 | but not exactly. */ | ||
411 | # define NeXT | ||
412 | # define host_self mach_host_self | ||
413 | # endif | ||
414 | |||
415 | # ifdef NeXT | ||
416 | # ifdef HAVE_MACH_MACH_H | ||
417 | # include <mach/mach.h> | ||
418 | # else | ||
419 | # include <mach.h> | ||
420 | # endif | ||
421 | # endif /* NeXT */ | ||
422 | |||
423 | # ifdef sgi | ||
424 | # include <sys/sysmp.h> | ||
425 | # endif /* sgi */ | ||
426 | |||
427 | # ifdef UMAX | ||
428 | # include <signal.h> | ||
429 | # include <sys/time.h> | ||
430 | # include <sys/wait.h> | ||
431 | # include <sys/syscall.h> | ||
432 | |||
433 | # ifdef UMAX_43 | ||
434 | # include <machine/cpu.h> | ||
435 | # include <inq_stats/statistics.h> | ||
436 | # include <inq_stats/sysstats.h> | ||
437 | # include <inq_stats/cpustats.h> | ||
438 | # include <inq_stats/procstats.h> | ||
439 | # else /* Not UMAX_43. */ | ||
440 | # include <sys/sysdefs.h> | ||
441 | # include <sys/statistics.h> | ||
442 | # include <sys/sysstats.h> | ||
443 | # include <sys/cpudefs.h> | ||
444 | # include <sys/cpustats.h> | ||
445 | # include <sys/procstats.h> | ||
446 | # endif /* Not UMAX_43. */ | ||
447 | # endif /* UMAX */ | ||
448 | |||
449 | # ifdef DGUX | ||
450 | # include <sys/dg_sys_info.h> | ||
451 | # endif | ||
452 | |||
453 | # include "fcntl--.h" | ||
454 | |||
455 | /* Avoid static vars inside a function since in HPUX they dump as pure. */ | ||
456 | |||
457 | # ifdef NeXT | ||
458 | static processor_set_t default_set; | ||
459 | static bool getloadavg_initialized; | ||
460 | # endif /* NeXT */ | ||
461 | |||
462 | # ifdef UMAX | ||
463 | static unsigned int cpus = 0; | ||
464 | static unsigned int samples; | ||
465 | # endif /* UMAX */ | ||
466 | |||
467 | # ifdef DGUX | ||
468 | static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ | ||
469 | # endif /* DGUX */ | ||
470 | |||
471 | # if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE) | ||
472 | /* File descriptor open to /dev/kmem or VMS load ave driver. */ | ||
473 | static int channel; | ||
474 | /* True iff channel is valid. */ | ||
475 | static bool getloadavg_initialized; | ||
476 | /* Offset in kmem to seek to read load average, or 0 means invalid. */ | ||
477 | static long offset; | ||
478 | |||
479 | # if ! defined __VMS && ! defined sgi && ! defined __linux__ | ||
480 | static struct nlist nl[2]; | ||
481 | # endif | ||
482 | |||
483 | # ifdef SUNOS_5 | ||
484 | static kvm_t *kd; | ||
485 | # endif /* SUNOS_5 */ | ||
486 | |||
487 | # endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ | ||
488 | |||
489 | /* Put the 1 minute, 5 minute and 15 minute load averages | ||
490 | into the first NELEM elements of LOADAVG. | ||
491 | Return the number written (never more than 3, but may be less than NELEM), | ||
492 | or -1 if an error occurred. */ | ||
493 | |||
494 | int | ||
495 | getloadavg (double loadavg[], int nelem) | ||
496 | { | ||
497 | int elem = 0; /* Return value. */ | ||
498 | |||
499 | # ifdef NO_GET_LOAD_AVG | ||
500 | # define LDAV_DONE | ||
501 | /* Set errno to zero to indicate that there was no particular error; | ||
502 | this function just can't work at all on this system. */ | ||
503 | errno = 0; | ||
504 | elem = -1; | ||
505 | # endif | ||
506 | |||
507 | # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) | ||
508 | /* Use libkstat because we don't have to be root. */ | ||
509 | # define LDAV_DONE | ||
510 | kstat_ctl_t *kc; | ||
511 | kstat_t *ksp; | ||
512 | kstat_named_t *kn; | ||
513 | |||
514 | kc = kstat_open (); | ||
515 | if (kc == 0) | ||
516 | return -1; | ||
517 | ksp = kstat_lookup (kc, "unix", 0, "system_misc"); | ||
518 | if (ksp == 0) | ||
519 | return -1; | ||
520 | if (kstat_read (kc, ksp, 0) == -1) | ||
521 | return -1; | ||
522 | |||
523 | |||
524 | kn = kstat_data_lookup (ksp, "avenrun_1min"); | ||
525 | if (kn == 0) | ||
526 | { | ||
527 | /* Return -1 if no load average information is available. */ | ||
528 | nelem = 0; | ||
529 | elem = -1; | ||
530 | } | ||
531 | |||
532 | if (nelem >= 1) | ||
533 | loadavg[elem++] = (double) kn->value.ul / FSCALE; | ||
534 | |||
535 | if (nelem >= 2) | ||
536 | { | ||
537 | kn = kstat_data_lookup (ksp, "avenrun_5min"); | ||
538 | if (kn != 0) | ||
539 | { | ||
540 | loadavg[elem++] = (double) kn->value.ul / FSCALE; | ||
541 | |||
542 | if (nelem >= 3) | ||
543 | { | ||
544 | kn = kstat_data_lookup (ksp, "avenrun_15min"); | ||
545 | if (kn != 0) | ||
546 | loadavg[elem++] = (double) kn->value.ul / FSCALE; | ||
547 | } | ||
548 | } | ||
549 | } | ||
550 | |||
551 | kstat_close (kc); | ||
552 | # endif /* HAVE_LIBKSTAT */ | ||
553 | |||
554 | # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) | ||
555 | /* Use pstat_getdynamic() because we don't have to be root. */ | ||
556 | # define LDAV_DONE | ||
557 | # undef LOAD_AVE_TYPE | ||
558 | |||
559 | struct pst_dynamic dyn_info; | ||
560 | if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0) | ||
561 | return -1; | ||
562 | if (nelem > 0) | ||
563 | loadavg[elem++] = dyn_info.psd_avg_1_min; | ||
564 | if (nelem > 1) | ||
565 | loadavg[elem++] = dyn_info.psd_avg_5_min; | ||
566 | if (nelem > 2) | ||
567 | loadavg[elem++] = dyn_info.psd_avg_15_min; | ||
568 | |||
569 | # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ | ||
570 | |||
571 | # if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) | ||
572 | # define LDAV_DONE | ||
573 | # undef LOAD_AVE_TYPE | ||
574 | |||
575 | # ifndef LINUX_LDAV_FILE | ||
576 | # define LINUX_LDAV_FILE "/proc/loadavg" | ||
577 | # endif | ||
578 | |||
579 | char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")]; | ||
580 | char const *ptr = ldavgbuf; | ||
581 | int fd, count; | ||
582 | |||
583 | fd = open (LINUX_LDAV_FILE, O_RDONLY); | ||
584 | if (fd == -1) | ||
585 | return -1; | ||
586 | count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); | ||
587 | (void) close (fd); | ||
588 | if (count <= 0) | ||
589 | return -1; | ||
590 | ldavgbuf[count] = '\0'; | ||
591 | |||
592 | for (elem = 0; elem < nelem; elem++) | ||
593 | { | ||
594 | char *endptr; | ||
595 | double d = c_strtod (ptr, &endptr); | ||
596 | if (ptr == endptr) | ||
597 | { | ||
598 | if (elem == 0) | ||
599 | return -1; | ||
600 | break; | ||
601 | } | ||
602 | loadavg[elem] = d; | ||
603 | ptr = endptr; | ||
604 | } | ||
605 | |||
606 | return elem; | ||
607 | |||
608 | # endif /* __linux__ || __CYGWIN__ */ | ||
609 | |||
610 | # if !defined (LDAV_DONE) && defined (__NetBSD__) | ||
611 | # define LDAV_DONE | ||
612 | # undef LOAD_AVE_TYPE | ||
613 | |||
614 | # ifndef NETBSD_LDAV_FILE | ||
615 | # define NETBSD_LDAV_FILE "/kern/loadavg" | ||
616 | # endif | ||
617 | |||
618 | unsigned long int load_ave[3], scale; | ||
619 | int count; | ||
620 | FILE *fp; | ||
621 | |||
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; | ||
631 | |||
632 | for (elem = 0; elem < nelem; elem++) | ||
633 | loadavg[elem] = (double) load_ave[elem] / (double) scale; | ||
634 | |||
635 | return elem; | ||
636 | |||
637 | # endif /* __NetBSD__ */ | ||
638 | |||
639 | # if !defined (LDAV_DONE) && defined (NeXT) | ||
640 | # define LDAV_DONE | ||
641 | /* The NeXT code was adapted from iscreen 3.2. */ | ||
642 | |||
643 | host_t host; | ||
644 | struct processor_set_basic_info info; | ||
645 | unsigned int info_count; | ||
646 | |||
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. */ | ||
649 | |||
650 | if (!getloadavg_initialized) | ||
651 | { | ||
652 | if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) | ||
653 | getloadavg_initialized = true; | ||
654 | } | ||
655 | |||
656 | if (getloadavg_initialized) | ||
657 | { | ||
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 = false; | ||
663 | else | ||
664 | { | ||
665 | if (nelem > 0) | ||
666 | loadavg[elem++] = (double) info.load_average / LOAD_SCALE; | ||
667 | } | ||
668 | } | ||
669 | |||
670 | if (!getloadavg_initialized) | ||
671 | return -1; | ||
672 | # endif /* NeXT */ | ||
673 | |||
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. */ | ||
680 | |||
681 | struct proc_summary proc_sum_data; | ||
682 | struct stat_descr proc_info; | ||
683 | double load; | ||
684 | register unsigned int i, j; | ||
685 | |||
686 | if (cpus == 0) | ||
687 | { | ||
688 | register unsigned int c, i; | ||
689 | struct cpu_config conf; | ||
690 | struct stat_descr desc; | ||
691 | |||
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; | ||
697 | |||
698 | if (inq_stats (1, &desc)) | ||
699 | return -1; | ||
700 | |||
701 | c = 0; | ||
702 | for (i = 0; i < conf.config_maxclass; ++i) | ||
703 | { | ||
704 | struct class_stats stats; | ||
705 | bzero ((char *) &stats, sizeof stats); | ||
706 | |||
707 | desc.sd_type = CPUTYPE_CLASS; | ||
708 | desc.sd_objid = i; | ||
709 | desc.sd_addr = (char *) &stats; | ||
710 | desc.sd_size = sizeof stats; | ||
711 | |||
712 | if (inq_stats (1, &desc)) | ||
713 | return -1; | ||
714 | |||
715 | c += stats.class_numcpus; | ||
716 | } | ||
717 | cpus = c; | ||
718 | samples = cpus < 2 ? 3 : (2 * cpus / 3); | ||
719 | } | ||
720 | |||
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; | ||
727 | |||
728 | if (inq_stats (1, &proc_info) != 0) | ||
729 | return -1; | ||
730 | |||
731 | load = proc_sum_data.ps_nrunnable; | ||
732 | j = 0; | ||
733 | for (i = samples - 1; i > 0; --i) | ||
734 | { | ||
735 | load += proc_sum_data.ps_nrun[j]; | ||
736 | if (j++ == PS_NRUNSIZE) | ||
737 | j = 0; | ||
738 | } | ||
739 | |||
740 | if (nelem > 0) | ||
741 | loadavg[elem++] = load / samples / cpus; | ||
742 | # endif /* UMAX */ | ||
743 | |||
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); | ||
752 | |||
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 */ | ||
760 | |||
761 | # if !defined (LDAV_DONE) && defined (apollo) | ||
762 | # define LDAV_DONE | ||
763 | /* Apollo code from lisch@mentorg.com (Ray Lischner). | ||
764 | |||
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. | ||
769 | |||
770 | I'm not sure which operating system first supported this system call, | ||
771 | but I know that SR10.2 supports it. */ | ||
772 | |||
773 | extern void proc1_$get_loadav (); | ||
774 | unsigned long load_ave[3]; | ||
775 | |||
776 | proc1_$get_loadav (load_ave); | ||
777 | |||
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 */ | ||
785 | |||
786 | # if !defined (LDAV_DONE) && defined (OSF_MIPS) | ||
787 | # define LDAV_DONE | ||
788 | |||
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 */ | ||
796 | |||
797 | # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) | ||
798 | # define LDAV_DONE | ||
799 | |||
800 | /* A faithful emulation is going to have to be saved for a rainy day. */ | ||
801 | for ( ; elem < nelem; elem++) | ||
802 | { | ||
803 | loadavg[elem] = 0.0; | ||
804 | } | ||
805 | # endif /* __MSDOS__ || WINDOWS32 */ | ||
806 | |||
807 | # if !defined (LDAV_DONE) && defined (OSF_ALPHA) | ||
808 | # define LDAV_DONE | ||
809 | |||
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 */ | ||
818 | |||
819 | # if ! defined LDAV_DONE && defined __VMS | ||
820 | /* VMS specific code -- read from the Load Ave driver. */ | ||
821 | |||
822 | LOAD_AVE_TYPE load_ave[3]; | ||
823 | static bool getloadavg_initialized; | ||
824 | # ifdef eunice | ||
825 | struct | ||
826 | { | ||
827 | int dsc$w_length; | ||
828 | char *dsc$a_pointer; | ||
829 | } descriptor; | ||
830 | # endif | ||
831 | |||
832 | /* Ensure that there is a channel open to the load ave device. */ | ||
833 | if (!getloadavg_initialized) | ||
834 | { | ||
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 = true; | ||
844 | } | ||
845 | |||
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)) | ||
850 | { | ||
851 | sys$dassgn (channel); | ||
852 | getloadavg_initialized = false; | ||
853 | } | ||
854 | |||
855 | if (!getloadavg_initialized) | ||
856 | return -1; | ||
857 | # endif /* ! defined LDAV_DONE && defined __VMS */ | ||
858 | |||
859 | # if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS | ||
860 | |||
861 | /* UNIX-specific code -- read the average from /dev/kmem. */ | ||
862 | |||
863 | # define LDAV_PRIVILEGED /* This code requires special installation. */ | ||
864 | |||
865 | LOAD_AVE_TYPE load_ave[3]; | ||
866 | |||
867 | /* Get the address of LDAV_SYMBOL. */ | ||
868 | if (offset == 0) | ||
869 | { | ||
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 */ | ||
883 | |||
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. */ | ||
893 | { | ||
894 | # ifdef FIXUP_KERNEL_SYMBOL_ADDR | ||
895 | FIXUP_KERNEL_SYMBOL_ADDR (nl); | ||
896 | # endif | ||
897 | offset = nl[0].n_value; | ||
898 | } | ||
899 | # endif /* !SUNOS_5 */ | ||
900 | # else /* sgi */ | ||
901 | int ldav_off; | ||
902 | |||
903 | ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); | ||
904 | if (ldav_off != -1) | ||
905 | offset = (long int) ldav_off & 0x7fffffff; | ||
906 | # endif /* sgi */ | ||
907 | } | ||
908 | |||
909 | /* Make sure we have /dev/kmem open. */ | ||
910 | if (!getloadavg_initialized) | ||
911 | { | ||
912 | # ifndef SUNOS_5 | ||
913 | channel = open ("/dev/kmem", O_RDONLY); | ||
914 | if (channel >= 0) | ||
915 | { | ||
916 | /* Set the channel to close on exec, so it does not | ||
917 | litter any child's descriptor table. */ | ||
918 | set_cloexec_flag (channel, true); | ||
919 | getloadavg_initialized = true; | ||
920 | } | ||
921 | # else /* SUNOS_5 */ | ||
922 | /* We pass 0 for the kernel, corefile, and swapfile names | ||
923 | to use the currently running kernel. */ | ||
924 | kd = kvm_open (0, 0, 0, O_RDONLY, 0); | ||
925 | if (kd != 0) | ||
926 | { | ||
927 | /* nlist the currently running kernel. */ | ||
928 | kvm_nlist (kd, nl); | ||
929 | offset = nl[0].n_value; | ||
930 | getloadavg_initialized = true; | ||
931 | } | ||
932 | # endif /* SUNOS_5 */ | ||
933 | } | ||
934 | |||
935 | /* If we can, get the load average values. */ | ||
936 | if (offset && getloadavg_initialized) | ||
937 | { | ||
938 | /* Try to read the load. */ | ||
939 | # ifndef SUNOS_5 | ||
940 | if (lseek (channel, offset, 0) == -1L | ||
941 | || read (channel, (char *) load_ave, sizeof (load_ave)) | ||
942 | != sizeof (load_ave)) | ||
943 | { | ||
944 | close (channel); | ||
945 | getloadavg_initialized = false; | ||
946 | } | ||
947 | # else /* SUNOS_5 */ | ||
948 | if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) | ||
949 | != sizeof (load_ave)) | ||
950 | { | ||
951 | kvm_close (kd); | ||
952 | getloadavg_initialized = false; | ||
953 | } | ||
954 | # endif /* SUNOS_5 */ | ||
955 | } | ||
956 | |||
957 | if (offset == 0 || !getloadavg_initialized) | ||
958 | return -1; | ||
959 | # endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ | ||
960 | |||
961 | # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ | ||
962 | if (nelem > 0) | ||
963 | loadavg[elem++] = LDAV_CVT (load_ave[0]); | ||
964 | if (nelem > 1) | ||
965 | loadavg[elem++] = LDAV_CVT (load_ave[1]); | ||
966 | if (nelem > 2) | ||
967 | loadavg[elem++] = LDAV_CVT (load_ave[2]); | ||
968 | |||
969 | # define LDAV_DONE | ||
970 | # endif /* !LDAV_DONE && LOAD_AVE_TYPE */ | ||
971 | |||
972 | # if !defined LDAV_DONE | ||
973 | /* Set errno to zero to indicate that there was no particular error; | ||
974 | this function just can't work at all on this system. */ | ||
975 | errno = 0; | ||
976 | elem = -1; | ||
977 | # endif | ||
978 | return elem; | ||
979 | } | ||
980 | |||
981 | #endif /* ! HAVE_GETLOADAVG */ | ||
982 | |||
983 | #ifdef TEST | ||
984 | int | ||
985 | main (int argc, char **argv) | ||
986 | { | ||
987 | int naptime = 0; | ||
988 | |||
989 | if (argc > 1) | ||
990 | naptime = atoi (argv[1]); | ||
991 | |||
992 | while (1) | ||
993 | { | ||
994 | double avg[3]; | ||
995 | int loads; | ||
996 | |||
997 | errno = 0; /* Don't be misled if it doesn't set errno. */ | ||
998 | loads = getloadavg (avg, 3); | ||
999 | if (loads == -1) | ||
1000 | { | ||
1001 | perror ("Error getting load average"); | ||
1002 | return EXIT_FAILURE; | ||
1003 | } | ||
1004 | if (loads > 0) | ||
1005 | printf ("1-minute: %f ", avg[0]); | ||
1006 | if (loads > 1) | ||
1007 | printf ("5-minute: %f ", avg[1]); | ||
1008 | if (loads > 2) | ||
1009 | printf ("15-minute: %f ", avg[2]); | ||
1010 | if (loads > 0) | ||
1011 | putchar ('\n'); | ||
1012 | |||
1013 | if (naptime == 0) | ||
1014 | break; | ||
1015 | sleep (naptime); | ||
1016 | } | ||
1017 | |||
1018 | return EXIT_SUCCESS; | ||
1019 | } | ||
1020 | #endif /* TEST */ | ||