src/getloadavg.c

   1 /* Get the system load averages.
   2    Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995, 1997
   3         Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  18    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                                 otherwise, no load average is available.
  39    NLIST_STRUCT                 Include nlist.h, not a.out.h, and
  40                                 the nlist n_name element is a pointer,
  41                                 not an array.
  42    NLIST_NAME_UNION             struct nlist has an n_un member, not n_name.
  43    LINUX_LDAV_FILE              [__linux__]: File containing load averages.
  44
  45    Specific system predefines this file uses, aside from setting
  46    default values if not emacs:
  47
  48    apollo
  49    BSD                          Real BSD, not just BSD-like.
  50    convex
  51    DGUX
  52    eunice                       UNIX emulator under VMS.
  53    hpux
  54    __MSDOS__                    No-op for MSDOS.
  55    NeXT
  56    sgi
  57    sequent                      Sequent Dynix 3.x.x (BSD)
  58    _SEQUENT_                    Sequent DYNIX/ptx 1.x.x (SYSV)
  59    sony_news                    NEWS-OS (works at least for 4.1C)
  60    UMAX
  61    UMAX4_3
  62    VMS
  63    WINDOWS32                    No-op for Windows95/NT.
  64    __linux__                    Linux: assumes /proc filesystem mounted.
  65                                 Support from Michael K. Johnson.
  66    __NetBSD__                   NetBSD: assumes /kern filesystem mounted.
  67
  68    In addition, to avoid nesting many #ifdefs, we internally set
  69    LDAV_DONE to indicate that the load average has been computed.
  70
  71    We also #define LDAV_PRIVILEGED if a program will require
  72    special installation to be able to call getloadavg.  */
  73
  74 /* This should always be first.  */
  75 #ifdef HAVE_CONFIG_H
  76 # include <config.h>
  77 #endif
  78
  79 #include <sys/types.h>
  80
  81 /* Both the Emacs and non-Emacs sections want this.  Some
  82    configuration files' definitions for the LOAD_AVE_CVT macro (like
  83    sparc.h's) use macros like FSCALE, defined here.  */
  84 #if defined (unix) || defined (__unix)
  85 # include <sys/param.h>
  86 #endif
  87
  88
  89 /* Exclude all the code except the test program at the end
  90    if the system has its own `getloadavg' function.
  91
  92    The declaration of `errno' is needed by the test program
  93    as well as the function itself, so it comes first.  */
  94
  95 #include <errno.h>
  96
  97 #ifndef errno
  98 extern int errno;
  99 #endif
 100
 101 #ifndef HAVE_GETLOADAVG
 102
 103
 104 /* The existing Emacs configuration files define a macro called
 105    LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
 106    returns the load average multiplied by 100.  What we actually want
 107    is a macro called LDAV_CVT, which returns the load average as an
 108    unmultiplied double.
 109
 110    For backwards compatibility, we'll define LDAV_CVT in terms of
 111    LOAD_AVE_CVT, but future machine config files should just define
 112    LDAV_CVT directly.  */
 113
 114 # if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
 115 #  define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
 116 # endif
 117
 118 # if !defined (BSD) && defined (ultrix)
 119 /* Ultrix behaves like BSD on Vaxen.  */
 120 #  define BSD
 121 # endif
 122
 123 # ifdef NeXT
 124 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
 125    conflicts with the definition understood in this file, that this
 126    really is BSD. */
 127 #  undef BSD
 128
 129 /* NeXT defines FSCALE in <sys/param.h>.  However, we take FSCALE being
 130    defined to mean that the nlist method should be used, which is not true.  */
 131 #  undef FSCALE
 132 # endif
 133
 134 /* Set values that are different from the defaults, which are
 135    set a little farther down with #ifndef.  */
 136
 137
 138 /* Some shorthands.  */
 139
 140 # if defined (HPUX) && !defined (hpux)
 141 #  define hpux
 142 # endif
 143
 144 # if defined (__hpux) && !defined (hpux)
 145 #  define hpux
 146 # endif
 147
 148 # if defined (__sun) && !defined (sun)
 149 #  define sun
 150 # endif
 151
 152 # if defined(hp300) && !defined(hpux)
 153 #  define MORE_BSD
 154 # endif
 155
 156 # if defined(ultrix) && defined(mips)
 157 #  define decstation
 158 # endif
 159
 160 # if defined (__SVR4) && !defined (SVR4)
 161 #  define SVR4
 162 # endif
 163
 164 # if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
 165 #  define SUNOS_5
 166 # endif
 167
 168 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
 169 #  define OSF_ALPHA
 170 #  include <sys/mbuf.h>
 171 #  include <sys/socket.h>
 172 #  include <net/route.h>
 173 #  include <sys/table.h>
 174 # endif
 175
 176 # if defined (__osf__) && (defined (mips) || defined (__mips__))
 177 #  define OSF_MIPS
 178 #  include <sys/table.h>
 179 # endif
 180
 181 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
 182    default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>.  Combine
 183    that with a couple of other things and we'll have a unique match.  */
 184 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
 185 #  define tek4300                       /* Define by emacs, but not by other users.  */
 186 # endif
 187
 188
 189 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars.  */
 190 # ifndef LOAD_AVE_TYPE
 191
 192 #  ifdef MORE_BSD
 193 #   define LOAD_AVE_TYPE long
 194 #  endif
 195
 196 #  ifdef sun
 197 #   define LOAD_AVE_TYPE long
 198 #  endif
 199
 200 #  ifdef decstation
 201 #   define LOAD_AVE_TYPE long
 202 #  endif
 203
 204 #  ifdef _SEQUENT_
 205 #   define LOAD_AVE_TYPE long
 206 #  endif
 207
 208 #  ifdef sgi
 209 #   define LOAD_AVE_TYPE long
 210 #  endif
 211
 212 #  ifdef SVR4
 213 #   define LOAD_AVE_TYPE long
 214 #  endif
 215
 216 #  ifdef sony_news
 217 #   define LOAD_AVE_TYPE long
 218 #  endif
 219
 220 #  ifdef sequent
 221 #   define LOAD_AVE_TYPE long
 222 #  endif
 223
 224 #  ifdef OSF_ALPHA
 225 #   define LOAD_AVE_TYPE long
 226 #  endif
 227
 228 #  if defined (ardent) && defined (titan)
 229 #   define LOAD_AVE_TYPE long
 230 #  endif
 231
 232 #  ifdef tek4300
 233 #   define LOAD_AVE_TYPE long
 234 #  endif
 235
 236 #  if defined(alliant) && defined(i860) /* Alliant FX/2800 */
 237 #   define LOAD_AVE_TYPE long
 238 #  endif
 239
 240 #  ifdef _AIX
 241 #   define LOAD_AVE_TYPE long
 242 #  endif
 243
 244 #  ifdef convex
 245 #   define LOAD_AVE_TYPE double
 246 #   ifndef LDAV_CVT
 247 #    define LDAV_CVT(n) (n)
 248 #   endif
 249 #  endif
 250
 251 # endif /* No LOAD_AVE_TYPE.  */
 252
 253 # ifdef OSF_ALPHA
 254 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
 255    according to ghazi@noc.rutgers.edu.  */
 256 #  undef FSCALE
 257 #  define FSCALE 1024.0
 258 # endif
 259
 260 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
 261 /* <sys/param.h> defines an incorrect value for FSCALE on an
 262    Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu.  */
 263 #  undef FSCALE
 264 #  define FSCALE 100.0
 265 # endif
 266
 267
 268 # ifndef        FSCALE
 269
 270 /* SunOS and some others define FSCALE in sys/param.h.  */
 271
 272 #  ifdef MORE_BSD
 273 #   define FSCALE 2048.0
 274 #  endif
 275
 276 #  if defined(MIPS) || defined(SVR4) || defined(decstation)
 277 #   define FSCALE 256
 278 #  endif
 279
 280 #  if defined (sgi) || defined (sequent)
 281 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
 282    above under #ifdef MIPS.  But we want the sgi value.  */
 283 #   undef FSCALE
 284 #   define      FSCALE 1000.0
 285 #  endif
 286
 287 #  if defined (ardent) && defined (titan)
 288 #   define FSCALE 65536.0
 289 #  endif
 290
 291 #  ifdef tek4300
 292 #   define FSCALE 100.0
 293 #  endif
 294
 295 #  ifdef _AIX
 296 #   define FSCALE 65536.0
 297 #  endif
 298
 299 # endif /* Not FSCALE.  */
 300
 301 # if !defined (LDAV_CVT) && defined (FSCALE)
 302 #  define       LDAV_CVT(n) (((double) (n)) / FSCALE)
 303 # endif
 304
 305 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters.  */
 306 # ifndef NLIST_STRUCT
 307
 308 #  ifdef MORE_BSD
 309 #   define NLIST_STRUCT
 310 #  endif
 311
 312 #  ifdef sun
 313 #   define NLIST_STRUCT
 314 #  endif
 315
 316 #  ifdef decstation
 317 #   define NLIST_STRUCT
 318 #  endif
 319
 320 #  ifdef hpux
 321 #   define NLIST_STRUCT
 322 #  endif
 323
 324 #  if defined (_SEQUENT_) || defined (sequent)
 325 #   define NLIST_STRUCT
 326 #  endif
 327
 328 #  ifdef sgi
 329 #   define NLIST_STRUCT
 330 #  endif
 331
 332 #  ifdef SVR4
 333 #   define NLIST_STRUCT
 334 #  endif
 335
 336 #  ifdef sony_news
 337 #   define NLIST_STRUCT
 338 #  endif
 339
 340 #  ifdef OSF_ALPHA
 341 #   define NLIST_STRUCT
 342 #  endif
 343
 344 #  if defined (ardent) && defined (titan)
 345 #   define NLIST_STRUCT
 346 #  endif
 347
 348 #  ifdef tek4300
 349 #   define NLIST_STRUCT
 350 #  endif
 351
 352 #  ifdef butterfly
 353 #   define NLIST_STRUCT
 354 #  endif
 355
 356 #  if defined(alliant) && defined(i860) /* Alliant FX/2800 */
 357 #   define NLIST_STRUCT
 358 #  endif
 359
 360 #  ifdef _AIX
 361 #   define NLIST_STRUCT
 362 #  endif
 363
 364 # endif /* defined (NLIST_STRUCT) */
 365
 366
 367 # if defined(sgi) || (defined(mips) && !defined(BSD))
 368 #  define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
 369 # endif
 370
 371
 372 # if !defined (KERNEL_FILE) && defined (sequent)
 373 #  define KERNEL_FILE "/dynix"
 374 # endif
 375
 376 # if !defined (KERNEL_FILE) && defined (hpux)
 377 #  define KERNEL_FILE "/hp-ux"
 378 # endif
 379
 380 # if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
 381 #  define KERNEL_FILE "/unix"
 382 # endif
 383
 384
 385 # if !defined (LDAV_SYMBOL) && defined (alliant)
 386 #  define LDAV_SYMBOL "_Loadavg"
 387 # endif
 388
 389 # if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
 390 #  define LDAV_SYMBOL "avenrun"
 391 # endif
 392
 393 # ifdef HAVE_UNISTD_H
 394 #  include <unistd.h>
 395 # endif
 396
 397 # include <stdio.h>
 398
 399 /* LOAD_AVE_TYPE should only get defined if we're going to use the
 400    nlist method.  */
 401 # if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
 402 #  define LOAD_AVE_TYPE double
 403 # endif
 404
 405 # ifdef LOAD_AVE_TYPE
 406
 407 #  ifndef VMS
 408 #   ifndef __linux__
 409 #    ifndef NLIST_STRUCT
 410 #     include <a.out.h>
 411 #    else /* NLIST_STRUCT */
 412 #     include <nlist.h>
 413 #    endif /* NLIST_STRUCT */
 414
 415 #    ifdef SUNOS_5
 416 #     include <fcntl.h>
 417 #     include <kvm.h>
 418 #     include <kstat.h>
 419 #    endif
 420
 421 #    if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
 422 #     include <sys/pstat.h>
 423 #    endif
 424
 425 #    ifndef KERNEL_FILE
 426 #     define KERNEL_FILE "/vmunix"
 427 #    endif /* KERNEL_FILE */
 428
 429 #    ifndef LDAV_SYMBOL
 430 #     define LDAV_SYMBOL "_avenrun"
 431 #    endif /* LDAV_SYMBOL */
 432 #   endif /* __linux__ */
 433
 434 #  else /* VMS */
 435
 436 #   ifndef eunice
 437 #    include <iodef.h>
 438 #    include <descrip.h>
 439 #   else /* eunice */
 440 #    include <vms/iodef.h>
 441 #   endif /* eunice */
 442 #  endif /* VMS */
 443
 444 #  ifndef LDAV_CVT
 445 #   define LDAV_CVT(n) ((double) (n))
 446 #  endif /* !LDAV_CVT */
 447
 448 # endif /* LOAD_AVE_TYPE */
 449
 450 # if defined(__GNU__) && !defined (NeXT)
 451 /* Note that NeXT Openstep defines __GNU__ even though it should not.  */
 452 /* GNU system acts much like NeXT, for load average purposes,
 453    but not exactly.  */
 454 #  define NeXT
 455 #  define host_self mach_host_self
 456 # endif
 457
 458 # ifdef NeXT
 459 #  ifdef HAVE_MACH_MACH_H
 460 #   include <mach/mach.h>
 461 #  else
 462 #   include <mach.h>
 463 #  endif
 464 # endif /* NeXT */
 465
 466 # ifdef sgi
 467 #  include <sys/sysmp.h>
 468 # endif /* sgi */
 469
 470 # ifdef UMAX
 471 #  include <stdio.h>
 472 #  include <signal.h>
 473 #  include <sys/time.h>
 474 #  include <sys/wait.h>
 475 #  include <sys/syscall.h>
 476
 477 #  ifdef UMAX_43
 478 #   include <machine/cpu.h>
 479 #   include <inq_stats/statistics.h>
 480 #   include <inq_stats/sysstats.h>
 481 #   include <inq_stats/cpustats.h>
 482 #   include <inq_stats/procstats.h>
 483 #  else /* Not UMAX_43.  */
 484 #   include <sys/sysdefs.h>
 485 #   include <sys/statistics.h>
 486 #   include <sys/sysstats.h>
 487 #   include <sys/cpudefs.h>
 488 #   include <sys/cpustats.h>
 489 #   include <sys/procstats.h>
 490 #  endif /* Not UMAX_43.  */
 491 # endif /* UMAX */
 492
 493 # ifdef DGUX
 494 #  include <sys/dg_sys_info.h>
 495 # endif
 496
 497 # if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
 498 #  include <fcntl.h>
 499 # else
 500 #  include <sys/file.h>
 501 # endif
 502 \f
 503 /* Avoid static vars inside a function since in HPUX they dump as pure.  */
 504
 505 # ifdef NeXT
 506 static processor_set_t default_set;
 507 static int getloadavg_initialized;
 508 # endif /* NeXT */
 509
 510 # ifdef UMAX
 511 static unsigned int cpus = 0;
 512 static unsigned int samples;
 513 # endif /* UMAX */
 514
 515 # ifdef DGUX
 516 static struct dg_sys_info_load_info load_info;  /* what-a-mouthful! */
 517 # endif /* DGUX */
 518
 519 # ifdef LOAD_AVE_TYPE
 520 /* File descriptor open to /dev/kmem or VMS load ave driver.  */
 521 static int channel;
 522 /* Nonzero iff channel is valid.  */
 523 static int getloadavg_initialized;
 524 /* Offset in kmem to seek to read load average, or 0 means invalid.  */
 525 static long offset;
 526
 527 #  if !defined(VMS) && !defined(sgi) && !defined(__linux__)
 528 static struct nlist nl[2];
 529 #  endif /* Not VMS or sgi */
 530
 531 #  ifdef SUNOS_5
 532 static kvm_t *kd;
 533 #  endif /* SUNOS_5 */
 534
 535 # endif /* LOAD_AVE_TYPE */
 536 \f
 537 /* Put the 1 minute, 5 minute and 15 minute load averages
 538    into the first NELEM elements of LOADAVG.
 539    Return the number written (never more than 3, but may be less than NELEM),
 540    or -1 if an error occurred.  */
 541
 542 int
 543 getloadavg (loadavg, nelem)
 544      double loadavg[];
 545      int nelem;
 546 {
 547   int elem = 0;                 /* Return value.  */
 548
 549 # ifdef NO_GET_LOAD_AVG
 550 #  define LDAV_DONE
 551   /* Set errno to zero to indicate that there was no particular error;
 552      this function just can't work at all on this system.  */
 553   errno = 0;
 554   elem = -1;
 555 # endif
 556
 557 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
 558 /* Use libkstat because we don't have to be root.  */
 559 #  define LDAV_DONE
 560   kstat_ctl_t *kc;
 561   kstat_t *ksp;
 562   kstat_named_t *kn;
 563
 564   kc = kstat_open ();
 565   if (kc == 0)
 566     return -1;
 567   ksp = kstat_lookup (kc, "unix", 0, "system_misc");
 568   if (ksp == 0 )
 569     return -1;
 570   if (kstat_read (kc, ksp, 0) == -1)
 571     return -1;
 572
 573
 574   kn = kstat_data_lookup (ksp, "avenrun_1min");
 575   if (kn == 0)
 576     {
 577       /* Return -1 if no load average information is available.  */
 578       nelem = 0;
 579       elem = -1;
 580     }
 581
 582   if (nelem >= 1)
 583     loadavg[elem++] = (double) kn->value.ul/FSCALE;
 584
 585   if (nelem >= 2)
 586     {
 587       kn = kstat_data_lookup (ksp, "avenrun_5min");
 588       if (kn != 0)
 589         {
 590           loadavg[elem++] = (double) kn->value.ul/FSCALE;
 591
 592           if (nelem >= 3)
 593             {
 594               kn = kstat_data_lookup (ksp, "avenrun_15min");
 595               if (kn != 0)
 596                 loadavg[elem++] = (double) kn->value.ul/FSCALE;
 597             }
 598         }
 599     }
 600
 601   kstat_close (kc);
 602 # endif /* HAVE_LIBKSTAT */
 603
 604 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
 605 /* Use pstat_getdynamic() because we don't have to be root.  */
 606 #  define LDAV_DONE
 607 #  undef LOAD_AVE_TYPE
 608
 609   struct pst_dynamic dyn_info;
 610   if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
 611     return -1;
 612   if (nelem > 0)
 613     loadavg[elem++] = dyn_info.psd_avg_1_min;
 614   if (nelem > 1)
 615     loadavg[elem++] = dyn_info.psd_avg_5_min;
 616   if (nelem > 2)
 617     loadavg[elem++] = dyn_info.psd_avg_15_min;
 618
 619 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
 620
 621 # if !defined (LDAV_DONE) && defined (__linux__)
 622 #  define LDAV_DONE
 623 #  undef LOAD_AVE_TYPE
 624
 625 #  ifndef LINUX_LDAV_FILE
 626 #   define LINUX_LDAV_FILE "/proc/loadavg"
 627 #  endif
 628
 629   char ldavgbuf[40];
 630   double load_ave[3];
 631   int fd, count;
 632
 633   fd = open (LINUX_LDAV_FILE, O_RDONLY);
 634   if (fd == -1)
 635     return -1;
 636   count = read (fd, ldavgbuf, 40);
 637   (void) close (fd);
 638   if (count <= 0)
 639     return -1;
 640
 641   count = sscanf (ldavgbuf, "%lf %lf %lf",
 642                   &load_ave[0], &load_ave[1], &load_ave[2]);
 643   if (count < 1)
 644     return -1;
 645
 646   for (elem = 0; elem < nelem && elem < count; elem++)
 647     loadavg[elem] = load_ave[elem];
 648
 649   return elem;
 650
 651 # endif /* __linux__ */
 652
 653 # if !defined (LDAV_DONE) && defined (__NetBSD__)
 654 #  define LDAV_DONE
 655 #  undef LOAD_AVE_TYPE
 656
 657 #  ifndef NETBSD_LDAV_FILE
 658 #   define NETBSD_LDAV_FILE "/kern/loadavg"
 659 #  endif
 660
 661   unsigned long int load_ave[3], scale;
 662   int count;
 663   FILE *fp;
 664
 665   fp = fopen (NETBSD_LDAV_FILE, "r");
 666   if (fp == NULL)
 667     return -1;
 668   count = fscanf (fp, "%lu %lu %lu %lu\n",
 669                   &load_ave[0], &load_ave[1], &load_ave[2],
 670                   &scale);
 671   (void) fclose (fp);
 672   if (count != 4)
 673     return -1;
 674
 675   for (elem = 0; elem < nelem; elem++)
 676     loadavg[elem] = (double) load_ave[elem] / (double) scale;
 677
 678   return elem;
 679
 680 # endif /* __NetBSD__ */
 681
 682 # if !defined (LDAV_DONE) && defined (NeXT)
 683 #  define LDAV_DONE
 684   /* The NeXT code was adapted from iscreen 3.2.  */
 685
 686   host_t host;
 687   struct processor_set_basic_info info;
 688   unsigned info_count;
 689
 690   /* We only know how to get the 1-minute average for this system,
 691      so even if the caller asks for more than 1, we only return 1.  */
 692
 693   if (!getloadavg_initialized)
 694     {
 695       if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
 696         getloadavg_initialized = 1;
 697     }
 698
 699   if (getloadavg_initialized)
 700     {
 701       info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
 702       if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
 703                               (processor_set_info_t) &info, &info_count)
 704           != KERN_SUCCESS)
 705         getloadavg_initialized = 0;
 706       else
 707         {
 708           if (nelem > 0)
 709             loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
 710         }
 711     }
 712
 713   if (!getloadavg_initialized)
 714     return -1;
 715 # endif /* NeXT */
 716
 717 # if !defined (LDAV_DONE) && defined (UMAX)
 718 #  define LDAV_DONE
 719 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
 720    have a /dev/kmem.  Information about the workings of the running kernel
 721    can be gathered with inq_stats system calls.
 722    We only know how to get the 1-minute average for this system.  */
 723
 724   struct proc_summary proc_sum_data;
 725   struct stat_descr proc_info;
 726   double load;
 727   register unsigned int i, j;
 728
 729   if (cpus == 0)
 730     {
 731       register unsigned int c, i;
 732       struct cpu_config conf;
 733       struct stat_descr desc;
 734
 735       desc.sd_next = 0;
 736       desc.sd_subsys = SUBSYS_CPU;
 737       desc.sd_type = CPUTYPE_CONFIG;
 738       desc.sd_addr = (char *) &conf;
 739       desc.sd_size = sizeof conf;
 740
 741       if (inq_stats (1, &desc))
 742         return -1;
 743
 744       c = 0;
 745       for (i = 0; i < conf.config_maxclass; ++i)
 746         {
 747           struct class_stats stats;
 748           bzero ((char *) &stats, sizeof stats);
 749
 750           desc.sd_type = CPUTYPE_CLASS;
 751           desc.sd_objid = i;
 752           desc.sd_addr = (char *) &stats;
 753           desc.sd_size = sizeof stats;
 754
 755           if (inq_stats (1, &desc))
 756             return -1;
 757
 758           c += stats.class_numcpus;
 759         }
 760       cpus = c;
 761       samples = cpus < 2 ? 3 : (2 * cpus / 3);
 762     }
 763
 764   proc_info.sd_next = 0;
 765   proc_info.sd_subsys = SUBSYS_PROC;
 766   proc_info.sd_type = PROCTYPE_SUMMARY;
 767   proc_info.sd_addr = (char *) &proc_sum_data;
 768   proc_info.sd_size = sizeof (struct proc_summary);
 769   proc_info.sd_sizeused = 0;
 770
 771   if (inq_stats (1, &proc_info) != 0)
 772     return -1;
 773
 774   load = proc_sum_data.ps_nrunnable;
 775   j = 0;
 776   for (i = samples - 1; i > 0; --i)
 777     {
 778       load += proc_sum_data.ps_nrun[j];
 779       if (j++ == PS_NRUNSIZE)
 780         j = 0;
 781     }
 782
 783   if (nelem > 0)
 784     loadavg[elem++] = load / samples / cpus;
 785 # endif /* UMAX */
 786
 787 # if !defined (LDAV_DONE) && defined (DGUX)
 788 #  define LDAV_DONE
 789   /* This call can return -1 for an error, but with good args
 790      it's not supposed to fail.  The first argument is for no
 791      apparent reason of type `long int *'.  */
 792   dg_sys_info ((long int *) &load_info,
 793                DG_SYS_INFO_LOAD_INFO_TYPE,
 794                DG_SYS_INFO_LOAD_VERSION_0);
 795
 796   if (nelem > 0)
 797     loadavg[elem++] = load_info.one_minute;
 798   if (nelem > 1)
 799     loadavg[elem++] = load_info.five_minute;
 800   if (nelem > 2)
 801     loadavg[elem++] = load_info.fifteen_minute;
 802 # endif /* DGUX */
 803
 804 # if !defined (LDAV_DONE) && defined (apollo)
 805 #  define LDAV_DONE
 806 /* Apollo code from lisch@mentorg.com (Ray Lischner).
 807
 808    This system call is not documented.  The load average is obtained as
 809    three long integers, for the load average over the past minute,
 810    five minutes, and fifteen minutes.  Each value is a scaled integer,
 811    with 16 bits of integer part and 16 bits of fraction part.
 812
 813    I'm not sure which operating system first supported this system call,
 814    but I know that SR10.2 supports it.  */
 815
 816   extern void proc1_$get_loadav ();
 817   unsigned long load_ave[3];
 818
 819   proc1_$get_loadav (load_ave);
 820
 821   if (nelem > 0)
 822     loadavg[elem++] = load_ave[0] / 65536.0;
 823   if (nelem > 1)
 824     loadavg[elem++] = load_ave[1] / 65536.0;
 825   if (nelem > 2)
 826     loadavg[elem++] = load_ave[2] / 65536.0;
 827 # endif /* apollo */
 828
 829 # if !defined (LDAV_DONE) && defined (OSF_MIPS)
 830 #  define LDAV_DONE
 831
 832   struct tbl_loadavg load_ave;
 833   table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
 834   loadavg[elem++]
 835     = (load_ave.tl_lscale == 0
 836        ? load_ave.tl_avenrun.d[0]
 837        : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
 838 # endif /* OSF_MIPS */
 839
 840 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
 841 #  define LDAV_DONE
 842
 843   /* A faithful emulation is going to have to be saved for a rainy day.  */
 844   for ( ; elem < nelem; elem++)
 845     {
 846       loadavg[elem] = 0.0;
 847     }
 848 # endif  /* __MSDOS__ || WINDOWS32 */
 849
 850 # if !defined (LDAV_DONE) && defined (OSF_ALPHA)
 851 #  define LDAV_DONE
 852
 853   struct tbl_loadavg load_ave;
 854   table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
 855   for (elem = 0; elem < nelem; elem++)
 856     loadavg[elem]
 857       = (load_ave.tl_lscale == 0
 858        ? load_ave.tl_avenrun.d[elem]
 859        : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
 860 # endif /* OSF_ALPHA */
 861
 862 # if !defined (LDAV_DONE) && defined (VMS)
 863   /* VMS specific code -- read from the Load Ave driver.  */
 864
 865   LOAD_AVE_TYPE load_ave[3];
 866   static int getloadavg_initialized = 0;
 867 #  ifdef eunice
 868   struct
 869   {
 870     int dsc$w_length;
 871     char *dsc$a_pointer;
 872   } descriptor;
 873 #  endif
 874
 875   /* Ensure that there is a channel open to the load ave device.  */
 876   if (!getloadavg_initialized)
 877     {
 878       /* Attempt to open the channel.  */
 879 #  ifdef eunice
 880       descriptor.dsc$w_length = 18;
 881       descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
 882 #  else
 883       $DESCRIPTOR (descriptor, "LAV0:");
 884 #  endif
 885       if (sys$assign (&descriptor, &channel, 0, 0) & 1)
 886         getloadavg_initialized = 1;
 887     }
 888
 889   /* Read the load average vector.  */
 890   if (getloadavg_initialized
 891       && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
 892                      load_ave, 12, 0, 0, 0, 0) & 1))
 893     {
 894       sys$dassgn (channel);
 895       getloadavg_initialized = 0;
 896     }
 897
 898   if (!getloadavg_initialized)
 899     return -1;
 900 # endif /* VMS */
 901
 902 # if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
 903
 904   /* UNIX-specific code -- read the average from /dev/kmem.  */
 905
 906 #  define LDAV_PRIVILEGED               /* This code requires special installation.  */
 907
 908   LOAD_AVE_TYPE load_ave[3];
 909
 910   /* Get the address of LDAV_SYMBOL.  */
 911   if (offset == 0)
 912     {
 913 #  ifndef sgi
 914 #   ifndef NLIST_STRUCT
 915       strcpy (nl[0].n_name, LDAV_SYMBOL);
 916       strcpy (nl[1].n_name, "");
 917 #   else /* NLIST_STRUCT */
 918 #    ifdef NLIST_NAME_UNION
 919       nl[0].n_un.n_name = LDAV_SYMBOL;
 920       nl[1].n_un.n_name = 0;
 921 #    else /* not NLIST_NAME_UNION */
 922       nl[0].n_name = LDAV_SYMBOL;
 923       nl[1].n_name = 0;
 924 #    endif /* not NLIST_NAME_UNION */
 925 #   endif /* NLIST_STRUCT */
 926
 927 #   ifndef SUNOS_5
 928       if (
 929 #    if !(defined (_AIX) && !defined (ps2))
 930           nlist (KERNEL_FILE, nl)
 931 #    else  /* _AIX */
 932           knlist (nl, 1, sizeof (nl[0]))
 933 #    endif
 934           >= 0)
 935           /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i.  */
 936           {
 937 #    ifdef FIXUP_KERNEL_SYMBOL_ADDR
 938             FIXUP_KERNEL_SYMBOL_ADDR (nl);
 939 #    endif
 940             offset = nl[0].n_value;
 941           }
 942 #   endif /* !SUNOS_5 */
 943 #  else  /* sgi */
 944       int ldav_off;
 945
 946       ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
 947       if (ldav_off != -1)
 948         offset = (long) ldav_off & 0x7fffffff;
 949 #  endif /* sgi */
 950     }
 951
 952   /* Make sure we have /dev/kmem open.  */
 953   if (!getloadavg_initialized)
 954     {
 955 #  ifndef SUNOS_5
 956       channel = open ("/dev/kmem", 0);
 957       if (channel >= 0)
 958         {
 959           /* Set the channel to close on exec, so it does not
 960              litter any child's descriptor table.  */
 961 #   ifdef FD_SETFD
 962 #    ifndef FD_CLOEXEC
 963 #     define FD_CLOEXEC 1
 964 #    endif
 965           (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
 966 #   endif
 967           getloadavg_initialized = 1;
 968         }
 969 #  else /* SUNOS_5 */
 970       /* We pass 0 for the kernel, corefile, and swapfile names
 971          to use the currently running kernel.  */
 972       kd = kvm_open (0, 0, 0, O_RDONLY, 0);
 973       if (kd != 0)
 974         {
 975           /* nlist the currently running kernel.  */
 976           kvm_nlist (kd, nl);
 977           offset = nl[0].n_value;
 978           getloadavg_initialized = 1;
 979         }
 980 #  endif /* SUNOS_5 */
 981     }
 982
 983   /* If we can, get the load average values.  */
 984   if (offset && getloadavg_initialized)
 985     {
 986       /* Try to read the load.  */
 987 #  ifndef SUNOS_5
 988       if (lseek (channel, offset, 0) == -1L
 989           || read (channel, (char *) load_ave, sizeof (load_ave))
 990           != sizeof (load_ave))
 991         {
 992           close (channel);
 993           getloadavg_initialized = 0;
 994         }
 995 #  else  /* SUNOS_5 */
 996       if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
 997           != sizeof (load_ave))
 998         {
 999           kvm_close (kd);
1000           getloadavg_initialized = 0;
1001         }
1002 #  endif /* SUNOS_5 */
1003     }
1004
1005   if (offset == 0 || !getloadavg_initialized)
1006     return -1;
1007 # endif /* LOAD_AVE_TYPE and not VMS */
1008
1009 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS.  */
1010   if (nelem > 0)
1011     loadavg[elem++] = LDAV_CVT (load_ave[0]);
1012   if (nelem > 1)
1013     loadavg[elem++] = LDAV_CVT (load_ave[1]);
1014   if (nelem > 2)
1015     loadavg[elem++] = LDAV_CVT (load_ave[2]);
1016
1017 #  define LDAV_DONE
1018 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */
1019
1020 # ifdef LDAV_DONE
1021   return elem;
1022 # else
1023   /* Set errno to zero to indicate that there was no particular error;
1024      this function just can't work at all on this system.  */
1025   errno = 0;
1026   return -1;
1027 # endif
1028 }
1029
1030 #endif /* ! HAVE_GETLOADAVG */
1031 \f
1032 #ifdef TEST
1033 void
1034 main (argc, argv)
1035      int argc;
1036      char **argv;
1037 {
1038   int naptime = 0;
1039
1040   if (argc > 1)
1041     naptime = atoi (argv[1]);
1042
1043   while (1)
1044     {
1045       double avg[3];
1046       int loads;
1047
1048       errno = 0;                /* Don't be misled if it doesn't set errno.  */
1049       loads = getloadavg (avg, 3);
1050       if (loads == -1)
1051         {
1052           perror ("Error getting load average");
1053           exit (1);
1054         }
1055       if (loads > 0)
1056         printf ("1-minute: %f  ", avg[0]);
1057       if (loads > 1)
1058         printf ("5-minute: %f  ", avg[1]);
1059       if (loads > 2)
1060         printf ("15-minute: %f  ", avg[2]);
1061       if (loads > 0)
1062         putchar ('\n');
1063
1064       if (naptime == 0)
1065         break;
1066       sleep (naptime);
1067     }
1068
1069   exit (0);
1070 }
1071 #endif /* TEST */