getloadavg.c

   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 Free
   4 Software Foundation, Inc.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License along with
  17 this program; see the file COPYING.  If not, write to the Free Software
  18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.  */
  19
  20 /* Compile-time symbols that this file uses:
  21
  22    HAVE_PSTAT_GETDYNAMIC        Define this if your system has the
  23                                 pstat_getdynamic function.  I think it
  24                                 is unique to HPUX9.  The best way to get the
  25                                 definition is through the AC_FUNC_GETLOADAVG
  26                                 macro that comes with autoconf 2.13 or newer.
  27                                 If that isn't an option, then just put
  28                                 AC_CHECK_FUNCS(pstat_getdynamic) in your
  29                                 configure.in file.
  30    FIXUP_KERNEL_SYMBOL_ADDR()   Adjust address in returned struct nlist.
  31    KERNEL_FILE                  Pathname of the kernel to nlist.
  32    LDAV_CVT()                   Scale the load average from the kernel.
  33                                 Returns a double.
  34    LDAV_SYMBOL                  Name of kernel symbol giving load average.
  35    LOAD_AVE_TYPE                Type of the load average array in the kernel.
  36                                 Must be defined unless one of
  37                                 apollo, DGUX, NeXT, or UMAX is defined;
  38                                 or we have libkstat;
  39                                 otherwise, no load average is available.
  40    NLIST_STRUCT                 Include nlist.h, not a.out.h, and
  41                                 the nlist n_name element is a pointer,
  42                                 not an array.
  43    HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
  44    LINUX_LDAV_FILE              [__linux__]: File containing load averages.
  45
  46    Specific system predefines this file uses, aside from setting
  47    default values if not emacs:
  48
  49    apollo
  50    BSD                          Real BSD, not just BSD-like.
  51    convex
  52    DGUX
  53    eunice                       UNIX emulator under VMS.
  54    hpux
  55    __MSDOS__                    No-op for MSDOS.
  56    NeXT
  57    sgi
  58    sequent                      Sequent Dynix 3.x.x (BSD)
  59    _SEQUENT_                    Sequent DYNIX/ptx 1.x.x (SYSV)
  60    sony_news                    NEWS-OS (works at least for 4.1C)
  61    UMAX
  62    UMAX4_3
  63    VMS
  64    WINDOWS32                    No-op for Windows95/NT.
  65    __linux__                    Linux: assumes /proc filesystem mounted.
  66                                 Support from Michael K. Johnson.
  67    __NetBSD__                   NetBSD: assumes /kern filesystem mounted.
  68
  69    In addition, to avoid nesting many #ifdefs, we internally set
  70    LDAV_DONE to indicate that the load average has been computed.
  71
  72    We also #define LDAV_PRIVILEGED if a program will require
  73    special installation to be able to call getloadavg.  */
  74
  75 /* This should always be first.  */
  76 #ifdef HAVE_CONFIG_H
  77 # include <config.h>
  78 #endif
  79
  80 #include <sys/types.h>
  81
  82 /* Both the Emacs and non-Emacs sections want this.  Some
  83    configuration files' definitions for the LOAD_AVE_CVT macro (like
  84    sparc.h's) use macros like FSCALE, defined here.  */
  85 #if defined (unix) || defined (__unix)
  86 # include <sys/param.h>
  87 #endif
  88
  89
  90 /* Exclude all the code except the test program at the end
  91    if the system has its own `getloadavg' function.
  92
  93    The declaration of `errno' is needed by the test program
  94    as well as the function itself, so it comes first.  */
  95
  96 #include <errno.h>
  97
  98 #ifndef errno
  99 extern int errno;
 100 #endif
 101
 102 #if HAVE_LOCALE_H
 103 # include <locale.h>
 104 #endif
 105 #if !HAVE_SETLOCALE
 106 # define setlocale(Category, Locale) /* empty */
 107 #endif
 108
 109 #ifndef HAVE_GETLOADAVG
 110
 111
 112 /* The existing Emacs configuration files define a macro called
 113    LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
 114    returns the load average multiplied by 100.  What we actually want
 115    is a macro called LDAV_CVT, which returns the load average as an
 116    unmultiplied double.
 117
 118    For backwards compatibility, we'll define LDAV_CVT in terms of
 119    LOAD_AVE_CVT, but future machine config files should just define
 120    LDAV_CVT directly.  */
 121
 122 # if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
 123 #  define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
 124 # endif
 125
 126 # if !defined (BSD) && defined (ultrix)
 127 /* Ultrix behaves like BSD on Vaxen.  */
 128 #  define BSD
 129 # endif
 130
 131 # ifdef NeXT
 132 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
 133    conflicts with the definition understood in this file, that this
 134    really is BSD. */
 135 #  undef BSD
 136
 137 /* NeXT defines FSCALE in <sys/param.h>.  However, we take FSCALE being
 138    defined to mean that the nlist method should be used, which is not true.  */
 139 #  undef FSCALE
 140 # endif
 141
 142 /* Same issues as for NeXT apply to the HURD-based GNU system.  */
 143 # ifdef __GNU__
 144 #  undef BSD
 145 #  undef FSCALE
 146 # endif /* __GNU__ */
 147
 148 /* Set values that are different from the defaults, which are
 149    set a little farther down with #ifndef.  */
 150
 151
 152 /* Some shorthands.  */
 153
 154 # if defined (HPUX) && !defined (hpux)
 155 #  define hpux
 156 # endif
 157
 158 # if defined (__hpux) && !defined (hpux)
 159 #  define hpux
 160 # endif
 161
 162 # if defined (__sun) && !defined (sun)
 163 #  define sun
 164 # endif
 165
 166 # if defined(hp300) && !defined(hpux)
 167 #  define MORE_BSD
 168 # endif
 169
 170 # if defined(ultrix) && defined(mips)
 171 #  define decstation
 172 # endif
 173
 174 # if defined (__SVR4) && !defined (SVR4)
 175 #  define SVR4
 176 # endif
 177
 178 # if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
 179 #  define SUNOS_5
 180 # endif
 181
 182 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
 183 #  define OSF_ALPHA
 184 #  include <sys/mbuf.h>
 185 #  include <sys/socket.h>
 186 #  include <net/route.h>
 187 #  include <sys/table.h>
 188 # endif
 189
 190 # if defined (__osf__) && (defined (mips) || defined (__mips__))
 191 #  define OSF_MIPS
 192 #  include <sys/table.h>
 193 # endif
 194
 195 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
 196    default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>.  Combine
 197    that with a couple of other things and we'll have a unique match.  */
 198 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
 199 #  define tek4300                       /* Define by emacs, but not by other users.  */
 200 # endif
 201
 202 /* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
 203 # if defined(__QNX__)
 204 #  undef SVR4
 205 # endif
 206
 207 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars.  */
 208 # ifndef LOAD_AVE_TYPE
 209
 210 #  ifdef MORE_BSD
 211 #   define LOAD_AVE_TYPE long
 212 #  endif
 213
 214 #  ifdef sun
 215 #   define LOAD_AVE_TYPE long
 216 #  endif
 217
 218 #  ifdef decstation
 219 #   define LOAD_AVE_TYPE long
 220 #  endif
 221
 222 #  ifdef _SEQUENT_
 223 #   define LOAD_AVE_TYPE long
 224 #  endif
 225
 226 #  ifdef sgi
 227 #   define LOAD_AVE_TYPE long
 228 #  endif
 229
 230 #  ifdef SVR4
 231 #   define LOAD_AVE_TYPE long
 232 #  endif
 233
 234 #  ifdef sony_news
 235 #   define LOAD_AVE_TYPE long
 236 #  endif
 237
 238 #  ifdef sequent
 239 #   define LOAD_AVE_TYPE long
 240 #  endif
 241
 242 #  ifdef OSF_ALPHA
 243 #   define LOAD_AVE_TYPE long
 244 #  endif
 245
 246 #  if defined (ardent) && defined (titan)
 247 #   define LOAD_AVE_TYPE long
 248 #  endif
 249
 250 #  ifdef tek4300
 251 #   define LOAD_AVE_TYPE long
 252 #  endif
 253
 254 #  if defined(alliant) && defined(i860) /* Alliant FX/2800 */
 255 #   define LOAD_AVE_TYPE long
 256 #  endif
 257
 258 #  ifdef _AIX
 259 #   define LOAD_AVE_TYPE long
 260 #  endif
 261
 262 #  ifdef convex
 263 #   define LOAD_AVE_TYPE double
 264 #   ifndef LDAV_CVT
 265 #    define LDAV_CVT(n) (n)
 266 #   endif
 267 #  endif
 268
 269 # endif /* No LOAD_AVE_TYPE.  */
 270
 271 # ifdef OSF_ALPHA
 272 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
 273    according to ghazi@noc.rutgers.edu.  */
 274 #  undef FSCALE
 275 #  define FSCALE 1024.0
 276 # endif
 277
 278 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
 279 /* <sys/param.h> defines an incorrect value for FSCALE on an
 280    Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu.  */
 281 #  undef FSCALE
 282 #  define FSCALE 100.0
 283 # endif
 284
 285
 286 # ifndef        FSCALE
 287
 288 /* SunOS and some others define FSCALE in sys/param.h.  */
 289
 290 #  ifdef MORE_BSD
 291 #   define FSCALE 2048.0
 292 #  endif
 293
 294 #  if defined(MIPS) || defined(SVR4) || defined(decstation)
 295 #   define FSCALE 256
 296 #  endif
 297
 298 #  if defined (sgi) || defined (sequent)
 299 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
 300    above under #ifdef MIPS.  But we want the sgi value.  */
 301 #   undef FSCALE
 302 #   define      FSCALE 1000.0
 303 #  endif
 304
 305 #  if defined (ardent) && defined (titan)
 306 #   define FSCALE 65536.0
 307 #  endif
 308
 309 #  ifdef tek4300
 310 #   define FSCALE 100.0
 311 #  endif
 312
 313 #  ifdef _AIX
 314 #   define FSCALE 65536.0
 315 #  endif
 316
 317 # endif /* Not FSCALE.  */
 318
 319 # if !defined (LDAV_CVT) && defined (FSCALE)
 320 #  define       LDAV_CVT(n) (((double) (n)) / FSCALE)
 321 # endif
 322
 323
 324 # if defined(sgi) || (defined(mips) && !defined(BSD))
 325 #  define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
 326 # endif
 327
 328
 329 # if !defined (KERNEL_FILE) && defined (sequent)
 330 #  define KERNEL_FILE "/dynix"
 331 # endif
 332
 333 # if !defined (KERNEL_FILE) && defined (hpux)
 334 #  define KERNEL_FILE "/hp-ux"
 335 # endif
 336
 337 # if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
 338 #  define KERNEL_FILE "/unix"
 339 # endif
 340
 341
 342 # if !defined (LDAV_SYMBOL) && defined (alliant)
 343 #  define LDAV_SYMBOL "_Loadavg"
 344 # endif
 345
 346 # if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
 347 #  define LDAV_SYMBOL "avenrun"
 348 # endif
 349
 350 # ifdef HAVE_UNISTD_H
 351 #  include <unistd.h>
 352 # endif
 353
 354 # include <stdio.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)) && !defined(__riscos__)
 359 #  define LOAD_AVE_TYPE double
 360 # endif
 361
 362 # ifdef LOAD_AVE_TYPE
 363
 364 #  ifndef VMS
 365 #   ifndef __linux__
 366 #    ifdef HAVE_NLIST_H
 367 #     include <nlist.h>
 368 #    else
 369 #     include <a.out.h>
 370 #    endif
 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 <stdio.h>
 429 #  include <signal.h>
 430 #  include <sys/time.h>
 431 #  include <sys/wait.h>
 432 #  include <sys/syscall.h>
 433
 434 #  ifdef UMAX_43
 435 #   include <machine/cpu.h>
 436 #   include <inq_stats/statistics.h>
 437 #   include <inq_stats/sysstats.h>
 438 #   include <inq_stats/cpustats.h>
 439 #   include <inq_stats/procstats.h>
 440 #  else /* Not UMAX_43.  */
 441 #   include <sys/sysdefs.h>
 442 #   include <sys/statistics.h>
 443 #   include <sys/sysstats.h>
 444 #   include <sys/cpudefs.h>
 445 #   include <sys/cpustats.h>
 446 #   include <sys/procstats.h>
 447 #  endif /* Not UMAX_43.  */
 448 # endif /* UMAX */
 449
 450 # ifdef DGUX
 451 #  include <sys/dg_sys_info.h>
 452 # endif
 453
 454 # if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
 455 #  include <fcntl.h>
 456 # else
 457 #  include <sys/file.h>
 458 # endif
 459 \f
 460
 461 /* Avoid static vars inside a function since in HPUX they dump as pure.  */
 462
 463 # ifdef NeXT
 464 static processor_set_t default_set;
 465 static int getloadavg_initialized;
 466 # endif /* NeXT */
 467
 468 # ifdef UMAX
 469 static unsigned int cpus = 0;
 470 static unsigned int samples;
 471 # endif /* UMAX */
 472
 473 # ifdef DGUX
 474 static struct dg_sys_info_load_info load_info;  /* what-a-mouthful! */
 475 # endif /* DGUX */
 476
 477 #if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
 478 /* File descriptor open to /dev/kmem or VMS load ave driver.  */
 479 static int channel;
 480 /* Nonzero iff channel is valid.  */
 481 static int getloadavg_initialized;
 482 /* Offset in kmem to seek to read load average, or 0 means invalid.  */
 483 static long offset;
 484
 485 #if !defined(VMS) && !defined(sgi) && !defined(__linux__)
 486 static struct nlist nl[2];
 487 #endif /* Not VMS or sgi */
 488
 489 #ifdef SUNOS_5
 490 static kvm_t *kd;
 491 #endif /* SUNOS_5 */
 492
 493 #endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
 494 \f
 495 /* Put the 1 minute, 5 minute and 15 minute load averages
 496    into the first NELEM elements of LOADAVG.
 497    Return the number written (never more than 3, but may be less than NELEM),
 498    or -1 if an error occurred.  */
 499
 500 int
 501 getloadavg (double loadavg[], int nelem)
 502 {
 503   int elem = 0;                 /* Return value.  */
 504
 505 # ifdef NO_GET_LOAD_AVG
 506 #  define LDAV_DONE
 507   /* Set errno to zero to indicate that there was no particular error;
 508      this function just can't work at all on this system.  */
 509   errno = 0;
 510   elem = -1;
 511 # endif
 512
 513 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
 514 /* Use libkstat because we don't have to be root.  */
 515 #  define LDAV_DONE
 516   kstat_ctl_t *kc;
 517   kstat_t *ksp;
 518   kstat_named_t *kn;
 519
 520   kc = kstat_open ();
 521   if (kc == 0)
 522     return -1;
 523   ksp = kstat_lookup (kc, "unix", 0, "system_misc");
 524   if (ksp == 0 )
 525     return -1;
 526   if (kstat_read (kc, ksp, 0) == -1)
 527     return -1;
 528
 529
 530   kn = kstat_data_lookup (ksp, "avenrun_1min");
 531   if (kn == 0)
 532     {
 533       /* Return -1 if no load average information is available.  */
 534       nelem = 0;
 535       elem = -1;
 536     }
 537
 538   if (nelem >= 1)
 539     loadavg[elem++] = (double) kn->value.ul/FSCALE;
 540
 541   if (nelem >= 2)
 542     {
 543       kn = kstat_data_lookup (ksp, "avenrun_5min");
 544       if (kn != 0)
 545         {
 546           loadavg[elem++] = (double) kn->value.ul/FSCALE;
 547
 548           if (nelem >= 3)
 549             {
 550               kn = kstat_data_lookup (ksp, "avenrun_15min");
 551               if (kn != 0)
 552                 loadavg[elem++] = (double) kn->value.ul/FSCALE;
 553             }
 554         }
 555     }
 556
 557   kstat_close (kc);
 558 # endif /* HAVE_LIBKSTAT */
 559
 560 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
 561 /* Use pstat_getdynamic() because we don't have to be root.  */
 562 #  define LDAV_DONE
 563 #  undef LOAD_AVE_TYPE
 564
 565   struct pst_dynamic dyn_info;
 566   if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
 567     return -1;
 568   if (nelem > 0)
 569     loadavg[elem++] = dyn_info.psd_avg_1_min;
 570   if (nelem > 1)
 571     loadavg[elem++] = dyn_info.psd_avg_5_min;
 572   if (nelem > 2)
 573     loadavg[elem++] = dyn_info.psd_avg_15_min;
 574
 575 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
 576
 577 # if !defined (LDAV_DONE) && defined (__linux__)
 578 #  define LDAV_DONE
 579 #  undef LOAD_AVE_TYPE
 580
 581 #  ifndef LINUX_LDAV_FILE
 582 #   define LINUX_LDAV_FILE "/proc/loadavg"
 583 #  endif
 584
 585   char ldavgbuf[40];
 586   double load_ave[3];
 587   int fd, count;
 588
 589   fd = open (LINUX_LDAV_FILE, O_RDONLY);
 590   if (fd == -1)
 591     return -1;
 592   count = read (fd, ldavgbuf, 40);
 593   (void) close (fd);
 594   if (count <= 0)
 595     return -1;
 596
 597   /* The following sscanf must use the C locale.  */
 598   setlocale (LC_NUMERIC, "C");
 599   count = sscanf (ldavgbuf, "%lf %lf %lf",
 600                   &load_ave[0], &load_ave[1], &load_ave[2]);
 601   setlocale (LC_NUMERIC, "");
 602   if (count < 1)
 603     return -1;
 604
 605   for (elem = 0; elem < nelem && elem < count; elem++)
 606     loadavg[elem] = load_ave[elem];
 607
 608   return elem;
 609
 610 # endif /* __linux__ */
 611
 612 # if !defined (LDAV_DONE) && defined (__NetBSD__)
 613 #  define LDAV_DONE
 614 #  undef LOAD_AVE_TYPE
 615
 616 #  ifndef NETBSD_LDAV_FILE
 617 #   define NETBSD_LDAV_FILE "/kern/loadavg"
 618 #  endif
 619
 620   unsigned long int load_ave[3], scale;
 621   int count;
 622   FILE *fp;
 623
 624   fp = fopen (NETBSD_LDAV_FILE, "r");
 625   if (fp == NULL)
 626     return -1;
 627   count = fscanf (fp, "%lu %lu %lu %lu\n",
 628                   &load_ave[0], &load_ave[1], &load_ave[2],
 629                   &scale);
 630   (void) fclose (fp);
 631   if (count != 4)
 632     return -1;
 633
 634   for (elem = 0; elem < nelem; elem++)
 635     loadavg[elem] = (double) load_ave[elem] / (double) scale;
 636
 637   return elem;
 638
 639 # endif /* __NetBSD__ */
 640
 641 # if !defined (LDAV_DONE) && defined (NeXT)
 642 #  define LDAV_DONE
 643   /* The NeXT code was adapted from iscreen 3.2.  */
 644
 645   host_t host;
 646   struct processor_set_basic_info info;
 647   unsigned info_count;
 648
 649   /* We only know how to get the 1-minute average for this system,
 650      so even if the caller asks for more than 1, we only return 1.  */
 651
 652   if (!getloadavg_initialized)
 653     {
 654       if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
 655         getloadavg_initialized = 1;
 656     }
 657
 658   if (getloadavg_initialized)
 659     {
 660       info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
 661       if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
 662                               (processor_set_info_t) &info, &info_count)
 663           != KERN_SUCCESS)
 664         getloadavg_initialized = 0;
 665       else
 666         {
 667           if (nelem > 0)
 668             loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
 669         }
 670     }
 671
 672   if (!getloadavg_initialized)
 673     return -1;
 674 # endif /* NeXT */
 675
 676 # if !defined (LDAV_DONE) && defined (UMAX)
 677 #  define LDAV_DONE
 678 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
 679    have a /dev/kmem.  Information about the workings of the running kernel
 680    can be gathered with inq_stats system calls.
 681    We only know how to get the 1-minute average for this system.  */
 682
 683   struct proc_summary proc_sum_data;
 684   struct stat_descr proc_info;
 685   double load;
 686   register unsigned int i, j;
 687
 688   if (cpus == 0)
 689     {
 690       register unsigned int c, i;
 691       struct cpu_config conf;
 692       struct stat_descr desc;
 693
 694       desc.sd_next = 0;
 695       desc.sd_subsys = SUBSYS_CPU;
 696       desc.sd_type = CPUTYPE_CONFIG;
 697       desc.sd_addr = (char *) &conf;
 698       desc.sd_size = sizeof conf;
 699
 700       if (inq_stats (1, &desc))
 701         return -1;
 702
 703       c = 0;
 704       for (i = 0; i < conf.config_maxclass; ++i)
 705         {
 706           struct class_stats stats;
 707           bzero ((char *) &stats, sizeof stats);
 708
 709           desc.sd_type = CPUTYPE_CLASS;
 710           desc.sd_objid = i;
 711           desc.sd_addr = (char *) &stats;
 712           desc.sd_size = sizeof stats;
 713
 714           if (inq_stats (1, &desc))
 715             return -1;
 716
 717           c += stats.class_numcpus;
 718         }
 719       cpus = c;
 720       samples = cpus < 2 ? 3 : (2 * cpus / 3);
 721     }
 722
 723   proc_info.sd_next = 0;
 724   proc_info.sd_subsys = SUBSYS_PROC;
 725   proc_info.sd_type = PROCTYPE_SUMMARY;
 726   proc_info.sd_addr = (char *) &proc_sum_data;
 727   proc_info.sd_size = sizeof (struct proc_summary);
 728   proc_info.sd_sizeused = 0;
 729
 730   if (inq_stats (1, &proc_info) != 0)
 731     return -1;
 732
 733   load = proc_sum_data.ps_nrunnable;
 734   j = 0;
 735   for (i = samples - 1; i > 0; --i)
 736     {
 737       load += proc_sum_data.ps_nrun[j];
 738       if (j++ == PS_NRUNSIZE)
 739         j = 0;
 740     }
 741
 742   if (nelem > 0)
 743     loadavg[elem++] = load / samples / cpus;
 744 # endif /* UMAX */
 745
 746 # if !defined (LDAV_DONE) && defined (DGUX)
 747 #  define LDAV_DONE
 748   /* This call can return -1 for an error, but with good args
 749      it's not supposed to fail.  The first argument is for no
 750      apparent reason of type `long int *'.  */
 751   dg_sys_info ((long int *) &load_info,
 752                DG_SYS_INFO_LOAD_INFO_TYPE,
 753                DG_SYS_INFO_LOAD_VERSION_0);
 754
 755   if (nelem > 0)
 756     loadavg[elem++] = load_info.one_minute;
 757   if (nelem > 1)
 758     loadavg[elem++] = load_info.five_minute;
 759   if (nelem > 2)
 760     loadavg[elem++] = load_info.fifteen_minute;
 761 # endif /* DGUX */
 762
 763 # if !defined (LDAV_DONE) && defined (apollo)
 764 #  define LDAV_DONE
 765 /* Apollo code from lisch@mentorg.com (Ray Lischner).
 766
 767    This system call is not documented.  The load average is obtained as
 768    three long integers, for the load average over the past minute,
 769    five minutes, and fifteen minutes.  Each value is a scaled integer,
 770    with 16 bits of integer part and 16 bits of fraction part.
 771
 772    I'm not sure which operating system first supported this system call,
 773    but I know that SR10.2 supports it.  */
 774
 775   extern void proc1_$get_loadav ();
 776   unsigned long load_ave[3];
 777
 778   proc1_$get_loadav (load_ave);
 779
 780   if (nelem > 0)
 781     loadavg[elem++] = load_ave[0] / 65536.0;
 782   if (nelem > 1)
 783     loadavg[elem++] = load_ave[1] / 65536.0;
 784   if (nelem > 2)
 785     loadavg[elem++] = load_ave[2] / 65536.0;
 786 # endif /* apollo */
 787
 788 # if !defined (LDAV_DONE) && defined (OSF_MIPS)
 789 #  define LDAV_DONE
 790
 791   struct tbl_loadavg load_ave;
 792   table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
 793   loadavg[elem++]
 794     = (load_ave.tl_lscale == 0
 795        ? load_ave.tl_avenrun.d[0]
 796        : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
 797 # endif /* OSF_MIPS */
 798
 799 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
 800 #  define LDAV_DONE
 801
 802   /* A faithful emulation is going to have to be saved for a rainy day.  */
 803   for ( ; elem < nelem; elem++)
 804     {
 805       loadavg[elem] = 0.0;
 806     }
 807 # endif  /* __MSDOS__ || WINDOWS32 */
 808
 809 # if !defined (LDAV_DONE) && defined (OSF_ALPHA)
 810 #  define LDAV_DONE
 811
 812   struct tbl_loadavg load_ave;
 813   table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
 814   for (elem = 0; elem < nelem; elem++)
 815     loadavg[elem]
 816       = (load_ave.tl_lscale == 0
 817        ? load_ave.tl_avenrun.d[elem]
 818        : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
 819 # endif /* OSF_ALPHA */
 820
 821 # if !defined (LDAV_DONE) && defined (VMS)
 822   /* VMS specific code -- read from the Load Ave driver.  */
 823
 824   LOAD_AVE_TYPE load_ave[3];
 825   static int getloadavg_initialized = 0;
 826 #  ifdef eunice
 827   struct
 828   {
 829     int dsc$w_length;
 830     char *dsc$a_pointer;
 831   } descriptor;
 832 #  endif
 833
 834   /* Ensure that there is a channel open to the load ave device.  */
 835   if (!getloadavg_initialized)
 836     {
 837       /* Attempt to open the channel.  */
 838 #  ifdef eunice
 839       descriptor.dsc$w_length = 18;
 840       descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
 841 #  else
 842       $DESCRIPTOR (descriptor, "LAV0:");
 843 #  endif
 844       if (sys$assign (&descriptor, &channel, 0, 0) & 1)
 845         getloadavg_initialized = 1;
 846     }
 847
 848   /* Read the load average vector.  */
 849   if (getloadavg_initialized
 850       && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
 851                      load_ave, 12, 0, 0, 0, 0) & 1))
 852     {
 853       sys$dassgn (channel);
 854       getloadavg_initialized = 0;
 855     }
 856
 857   if (!getloadavg_initialized)
 858     return -1;
 859 # endif /* VMS */
 860
 861 # if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
 862
 863   /* UNIX-specific code -- read the average from /dev/kmem.  */
 864
 865 #  define LDAV_PRIVILEGED               /* This code requires special installation.  */
 866
 867   LOAD_AVE_TYPE load_ave[3];
 868
 869   /* Get the address of LDAV_SYMBOL.  */
 870   if (offset == 0)
 871     {
 872 #  ifndef sgi
 873 #   ifndef NLIST_STRUCT
 874       strcpy (nl[0].n_name, LDAV_SYMBOL);
 875       strcpy (nl[1].n_name, "");
 876 #   else /* NLIST_STRUCT */
 877 #    ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
 878       nl[0].n_un.n_name = LDAV_SYMBOL;
 879       nl[1].n_un.n_name = 0;
 880 #    else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
 881       nl[0].n_name = LDAV_SYMBOL;
 882       nl[1].n_name = 0;
 883 #    endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
 884 #   endif /* NLIST_STRUCT */
 885
 886 #   ifndef SUNOS_5
 887       if (
 888 #    if !(defined (_AIX) && !defined (ps2))
 889           nlist (KERNEL_FILE, nl)
 890 #    else  /* _AIX */
 891           knlist (nl, 1, sizeof (nl[0]))
 892 #    endif
 893           >= 0)
 894           /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i.  */
 895           {
 896 #    ifdef FIXUP_KERNEL_SYMBOL_ADDR
 897             FIXUP_KERNEL_SYMBOL_ADDR (nl);
 898 #    endif
 899             offset = nl[0].n_value;
 900           }
 901 #   endif /* !SUNOS_5 */
 902 #  else  /* sgi */
 903       int ldav_off;
 904
 905       ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
 906       if (ldav_off != -1)
 907         offset = (long) ldav_off & 0x7fffffff;
 908 #  endif /* sgi */
 909     }
 910
 911   /* Make sure we have /dev/kmem open.  */
 912   if (!getloadavg_initialized)
 913     {
 914 #  ifndef SUNOS_5
 915       channel = open ("/dev/kmem", 0);
 916       if (channel >= 0)
 917         {
 918           /* Set the channel to close on exec, so it does not
 919              litter any child's descriptor table.  */
 920 #   ifdef F_SETFD
 921 #    ifndef FD_CLOEXEC
 922 #     define FD_CLOEXEC 1
 923 #    endif
 924           (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
 925 #   endif
 926           getloadavg_initialized = 1;
 927         }
 928 #  else /* SUNOS_5 */
 929       /* We pass 0 for the kernel, corefile, and swapfile names
 930          to use the currently running kernel.  */
 931       kd = kvm_open (0, 0, 0, O_RDONLY, 0);
 932       if (kd != 0)
 933         {
 934           /* nlist the currently running kernel.  */
 935           kvm_nlist (kd, nl);
 936           offset = nl[0].n_value;
 937           getloadavg_initialized = 1;
 938         }
 939 #  endif /* SUNOS_5 */
 940     }
 941
 942   /* If we can, get the load average values.  */
 943   if (offset && getloadavg_initialized)
 944     {
 945       /* Try to read the load.  */
 946 #  ifndef SUNOS_5
 947       if (lseek (channel, offset, 0) == -1L
 948           || read (channel, (char *) load_ave, sizeof (load_ave))
 949           != sizeof (load_ave))
 950         {
 951           close (channel);
 952           getloadavg_initialized = 0;
 953         }
 954 #  else  /* SUNOS_5 */
 955       if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
 956           != sizeof (load_ave))
 957         {
 958           kvm_close (kd);
 959           getloadavg_initialized = 0;
 960         }
 961 #  endif /* SUNOS_5 */
 962     }
 963
 964   if (offset == 0 || !getloadavg_initialized)
 965     return -1;
 966 # endif /* LOAD_AVE_TYPE and not VMS */
 967
 968 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS.  */
 969   if (nelem > 0)
 970     loadavg[elem++] = LDAV_CVT (load_ave[0]);
 971   if (nelem > 1)
 972     loadavg[elem++] = LDAV_CVT (load_ave[1]);
 973   if (nelem > 2)
 974     loadavg[elem++] = LDAV_CVT (load_ave[2]);
 975
 976 #  define LDAV_DONE
 977 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */
 978
 979 # ifdef LDAV_DONE
 980   return elem;
 981 # else
 982   /* Set errno to zero to indicate that there was no particular error;
 983      this function just can't work at all on this system.  */
 984   errno = 0;
 985   return -1;
 986 # endif
 987 }
 988
 989 #endif /* ! HAVE_GETLOADAVG */
 990 \f
 991 #ifdef TEST
 992 #include "make.h"
 993
 994 int
 995 main (int argc, char **argv)
 996 {
 997   int naptime = 0;
 998
 999   if (argc > 1)
1000     naptime = atoi (argv[1]);
1001
1002   while (1)
1003     {
1004       double avg[3];
1005       int loads;
1006
1007       errno = 0;                /* Don't be misled if it doesn't set errno.  */
1008       loads = getloadavg (avg, 3);
1009       if (loads == -1)
1010         {
1011           perror ("Error getting load average");
1012           exit (1);
1013         }
1014       if (loads > 0)
1015         printf ("1-minute: %f  ", avg[0]);
1016       if (loads > 1)
1017         printf ("5-minute: %f  ", avg[1]);
1018       if (loads > 2)
1019         printf ("15-minute: %f  ", avg[2]);
1020       if (loads > 0)
1021         putchar ('\n');
1022
1023       if (naptime == 0)
1024         break;
1025       sleep (naptime);
1026     }
1027
1028   exit (0);
1029 }
1030 #endif /* TEST */