| 1 | /* Get the system load averages. |
| 2 | |
| 3 | Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2011 Free Software |
| 4 | Foundation, Inc. |
| 5 | |
| 6 | NOTE: The canonical source of this file is maintained with gnulib. |
| 7 | Bugs can be reported to bug-gnulib@gnu.org. |
| 8 | |
| 9 | This program is free software: you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | /* Compile-time symbols that this file uses: |
| 23 | |
| 24 | HAVE_PSTAT_GETDYNAMIC Define this if your system has the |
| 25 | pstat_getdynamic function. I think it |
| 26 | is unique to HPUX9. The best way to get the |
| 27 | definition is through the AC_FUNC_GETLOADAVG |
| 28 | macro that comes with autoconf 2.13 or newer. |
| 29 | If that isn't an option, then just put |
| 30 | AC_CHECK_FUNCS(pstat_getdynamic) in your |
| 31 | configure.in file. |
| 32 | HAVE_LIBPERFSTAT Define this if your system has the |
| 33 | perfstat_cpu_total function in libperfstat (AIX). |
| 34 | FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. |
| 35 | KERNEL_FILE Name of the kernel file to nlist. |
| 36 | LDAV_CVT() Scale the load average from the kernel. |
| 37 | Returns a double. |
| 38 | LDAV_SYMBOL Name of kernel symbol giving load average. |
| 39 | LOAD_AVE_TYPE Type of the load average array in the kernel. |
| 40 | Must be defined unless one of |
| 41 | apollo, DGUX, NeXT, or UMAX is defined; |
| 42 | or we have libkstat; |
| 43 | otherwise, no load average is available. |
| 44 | HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults |
| 45 | to this. |
| 46 | NLIST_STRUCT Include nlist.h, not a.out.h. |
| 47 | N_NAME_POINTER The nlist n_name element is a pointer, |
| 48 | not an array. |
| 49 | HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'. |
| 50 | LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing |
| 51 | load averages. |
| 52 | |
| 53 | Specific system predefines this file uses, aside from setting |
| 54 | default values if not emacs: |
| 55 | |
| 56 | apollo |
| 57 | BSD Real BSD, not just BSD-like. |
| 58 | convex |
| 59 | DGUX |
| 60 | eunice UNIX emulator under VMS. |
| 61 | hpux |
| 62 | __MSDOS__ No-op for MSDOS. |
| 63 | NeXT |
| 64 | sgi |
| 65 | sequent Sequent Dynix 3.x.x (BSD) |
| 66 | _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) |
| 67 | sony_news NEWS-OS (works at least for 4.1C) |
| 68 | UMAX |
| 69 | UMAX4_3 |
| 70 | VMS |
| 71 | WINDOWS32 No-op for Windows95/NT. |
| 72 | __linux__ Linux: assumes /proc file system mounted. |
| 73 | Support from Michael K. Johnson. |
| 74 | __CYGWIN__ Cygwin emulates linux /proc/loadavg. |
| 75 | __NetBSD__ NetBSD: assumes /kern file system mounted. |
| 76 | |
| 77 | In addition, to avoid nesting many #ifdefs, we internally set |
| 78 | LDAV_DONE to indicate that the load average has been computed. |
| 79 | |
| 80 | We also #define LDAV_PRIVILEGED if a program will require |
| 81 | special installation to be able to call getloadavg. */ |
| 82 | |
| 83 | /* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems |
| 84 | with partially-configured source directories. */ |
| 85 | |
| 86 | #ifndef CONFIGURING_GETLOADAVG |
| 87 | # include <config.h> |
| 88 | # include <stdbool.h> |
| 89 | #endif |
| 90 | |
| 91 | /* Specification. */ |
| 92 | #include <stdlib.h> |
| 93 | |
| 94 | #include <errno.h> |
| 95 | #include <stdio.h> |
| 96 | |
| 97 | # include <sys/types.h> |
| 98 | |
| 99 | /* Both the Emacs and non-Emacs sections want this. Some |
| 100 | configuration files' definitions for the LOAD_AVE_CVT macro (like |
| 101 | sparc.h's) use macros like FSCALE, defined here. */ |
| 102 | # if defined (unix) || defined (__unix) |
| 103 | # include <sys/param.h> |
| 104 | # endif |
| 105 | |
| 106 | # include "intprops.h" |
| 107 | |
| 108 | /* The existing Emacs configuration files define a macro called |
| 109 | LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and |
| 110 | returns the load average multiplied by 100. What we actually want |
| 111 | is a macro called LDAV_CVT, which returns the load average as an |
| 112 | unmultiplied double. |
| 113 | |
| 114 | For backwards compatibility, we'll define LDAV_CVT in terms of |
| 115 | LOAD_AVE_CVT, but future machine config files should just define |
| 116 | LDAV_CVT directly. */ |
| 117 | |
| 118 | # if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT) |
| 119 | # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) |
| 120 | # endif |
| 121 | |
| 122 | # if !defined (BSD) && defined (ultrix) |
| 123 | /* Ultrix behaves like BSD on Vaxen. */ |
| 124 | # define BSD |
| 125 | # endif |
| 126 | |
| 127 | # ifdef NeXT |
| 128 | /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which |
| 129 | conflicts with the definition understood in this file, that this |
| 130 | really is BSD. */ |
| 131 | # undef BSD |
| 132 | |
| 133 | /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being |
| 134 | defined to mean that the nlist method should be used, which is not true. */ |
| 135 | # undef FSCALE |
| 136 | # endif |
| 137 | |
| 138 | /* Same issues as for NeXT apply to the HURD-based GNU system. */ |
| 139 | # ifdef __GNU__ |
| 140 | # undef BSD |
| 141 | # undef FSCALE |
| 142 | # endif /* __GNU__ */ |
| 143 | |
| 144 | /* Set values that are different from the defaults, which are |
| 145 | set a little farther down with #ifndef. */ |
| 146 | |
| 147 | |
| 148 | /* Some shorthands. */ |
| 149 | |
| 150 | # if defined (HPUX) && !defined (hpux) |
| 151 | # define hpux |
| 152 | # endif |
| 153 | |
| 154 | # if defined (__hpux) && !defined (hpux) |
| 155 | # define hpux |
| 156 | # endif |
| 157 | |
| 158 | # if defined (__sun) && !defined (sun) |
| 159 | # define sun |
| 160 | # endif |
| 161 | |
| 162 | # if defined (hp300) && !defined (hpux) |
| 163 | # define MORE_BSD |
| 164 | # endif |
| 165 | |
| 166 | # if defined (ultrix) && defined (mips) |
| 167 | # define decstation |
| 168 | # endif |
| 169 | |
| 170 | # if defined (__SVR4) && !defined (SVR4) |
| 171 | # define SVR4 |
| 172 | # endif |
| 173 | |
| 174 | # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) |
| 175 | # define SUNOS_5 |
| 176 | # endif |
| 177 | |
| 178 | # if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) |
| 179 | # define OSF_ALPHA |
| 180 | # include <sys/mbuf.h> |
| 181 | # include <sys/socket.h> |
| 182 | # include <net/route.h> |
| 183 | # include <sys/table.h> |
| 184 | /* Tru64 4.0D's table.h redefines sys */ |
| 185 | # undef sys |
| 186 | # endif |
| 187 | |
| 188 | # if defined (__osf__) && (defined (mips) || defined (__mips__)) |
| 189 | # define OSF_MIPS |
| 190 | # include <sys/table.h> |
| 191 | # endif |
| 192 | |
| 193 | /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by |
| 194 | default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine |
| 195 | that with a couple of other things and we'll have a unique match. */ |
| 196 | # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) |
| 197 | # define tek4300 /* Define by emacs, but not by other users. */ |
| 198 | # endif |
| 199 | |
| 200 | |
| 201 | /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ |
| 202 | # ifndef LOAD_AVE_TYPE |
| 203 | |
| 204 | # ifdef MORE_BSD |
| 205 | # define LOAD_AVE_TYPE long |
| 206 | # endif |
| 207 | |
| 208 | # ifdef sun |
| 209 | # define LOAD_AVE_TYPE long |
| 210 | # endif |
| 211 | |
| 212 | # ifdef decstation |
| 213 | # define LOAD_AVE_TYPE long |
| 214 | # endif |
| 215 | |
| 216 | # ifdef _SEQUENT_ |
| 217 | # define LOAD_AVE_TYPE long |
| 218 | # endif |
| 219 | |
| 220 | # ifdef sgi |
| 221 | # define LOAD_AVE_TYPE long |
| 222 | # endif |
| 223 | |
| 224 | # ifdef SVR4 |
| 225 | # define LOAD_AVE_TYPE long |
| 226 | # endif |
| 227 | |
| 228 | # ifdef sony_news |
| 229 | # define LOAD_AVE_TYPE long |
| 230 | # endif |
| 231 | |
| 232 | # ifdef sequent |
| 233 | # define LOAD_AVE_TYPE long |
| 234 | # endif |
| 235 | |
| 236 | # ifdef OSF_ALPHA |
| 237 | # define LOAD_AVE_TYPE long |
| 238 | # endif |
| 239 | |
| 240 | # if defined (ardent) && defined (titan) |
| 241 | # define LOAD_AVE_TYPE long |
| 242 | # endif |
| 243 | |
| 244 | # ifdef tek4300 |
| 245 | # define LOAD_AVE_TYPE long |
| 246 | # endif |
| 247 | |
| 248 | # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ |
| 249 | # define LOAD_AVE_TYPE long |
| 250 | # endif |
| 251 | |
| 252 | # if defined _AIX && ! defined HAVE_LIBPERFSTAT |
| 253 | # define LOAD_AVE_TYPE long |
| 254 | # endif |
| 255 | |
| 256 | # ifdef convex |
| 257 | # define LOAD_AVE_TYPE double |
| 258 | # ifndef LDAV_CVT |
| 259 | # define LDAV_CVT(n) (n) |
| 260 | # endif |
| 261 | # endif |
| 262 | |
| 263 | # endif /* No LOAD_AVE_TYPE. */ |
| 264 | |
| 265 | # ifdef OSF_ALPHA |
| 266 | /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, |
| 267 | according to ghazi@noc.rutgers.edu. */ |
| 268 | # undef FSCALE |
| 269 | # define FSCALE 1024.0 |
| 270 | # endif |
| 271 | |
| 272 | # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ |
| 273 | /* <sys/param.h> defines an incorrect value for FSCALE on an |
| 274 | Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */ |
| 275 | # undef FSCALE |
| 276 | # define FSCALE 100.0 |
| 277 | # endif |
| 278 | |
| 279 | |
| 280 | # ifndef FSCALE |
| 281 | |
| 282 | /* SunOS and some others define FSCALE in sys/param.h. */ |
| 283 | |
| 284 | # ifdef MORE_BSD |
| 285 | # define FSCALE 2048.0 |
| 286 | # endif |
| 287 | |
| 288 | # if defined (MIPS) || defined (SVR4) || defined (decstation) |
| 289 | # define FSCALE 256 |
| 290 | # endif |
| 291 | |
| 292 | # if defined (sgi) || defined (sequent) |
| 293 | /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined |
| 294 | above under #ifdef MIPS. But we want the sgi value. */ |
| 295 | # undef FSCALE |
| 296 | # define FSCALE 1000.0 |
| 297 | # endif |
| 298 | |
| 299 | # if defined (ardent) && defined (titan) |
| 300 | # define FSCALE 65536.0 |
| 301 | # endif |
| 302 | |
| 303 | # ifdef tek4300 |
| 304 | # define FSCALE 100.0 |
| 305 | # endif |
| 306 | |
| 307 | # if defined _AIX && !defined HAVE_LIBPERFSTAT |
| 308 | # define FSCALE 65536.0 |
| 309 | # endif |
| 310 | |
| 311 | # endif /* Not FSCALE. */ |
| 312 | |
| 313 | # if !defined (LDAV_CVT) && defined (FSCALE) |
| 314 | # define LDAV_CVT(n) (((double) (n)) / FSCALE) |
| 315 | # endif |
| 316 | |
| 317 | # ifndef NLIST_STRUCT |
| 318 | # if HAVE_NLIST_H |
| 319 | # define NLIST_STRUCT |
| 320 | # endif |
| 321 | # endif |
| 322 | |
| 323 | # if defined (sgi) || (defined (mips) && !defined (BSD)) |
| 324 | # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) |
| 325 | # endif |
| 326 | |
| 327 | |
| 328 | # if !defined (KERNEL_FILE) && defined (sequent) |
| 329 | # define KERNEL_FILE "/dynix" |
| 330 | # endif |
| 331 | |
| 332 | # if !defined (KERNEL_FILE) && defined (hpux) |
| 333 | # define KERNEL_FILE "/hp-ux" |
| 334 | # endif |
| 335 | |
| 336 | # if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan))) |
| 337 | # define KERNEL_FILE "/unix" |
| 338 | # endif |
| 339 | |
| 340 | |
| 341 | # if !defined (LDAV_SYMBOL) && defined (alliant) |
| 342 | # define LDAV_SYMBOL "_Loadavg" |
| 343 | # endif |
| 344 | |
| 345 | # if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || (defined (_AIX) && !defined(HAVE_LIBPERFSTAT))) |
| 346 | # define LDAV_SYMBOL "avenrun" |
| 347 | # endif |
| 348 | |
| 349 | # include <unistd.h> |
| 350 | |
| 351 | /* LOAD_AVE_TYPE should only get defined if we're going to use the |
| 352 | nlist method. */ |
| 353 | # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL)) |
| 354 | # define LOAD_AVE_TYPE double |
| 355 | # endif |
| 356 | |
| 357 | # ifdef LOAD_AVE_TYPE |
| 358 | |
| 359 | # ifndef __VMS |
| 360 | # ifndef __linux__ |
| 361 | # ifndef NLIST_STRUCT |
| 362 | # include <a.out.h> |
| 363 | # else /* NLIST_STRUCT */ |
| 364 | # include <nlist.h> |
| 365 | # endif /* NLIST_STRUCT */ |
| 366 | |
| 367 | # ifdef SUNOS_5 |
| 368 | # include <kvm.h> |
| 369 | # include <kstat.h> |
| 370 | # endif |
| 371 | |
| 372 | # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
| 373 | # include <sys/pstat.h> |
| 374 | # endif |
| 375 | |
| 376 | # ifndef KERNEL_FILE |
| 377 | # define KERNEL_FILE "/vmunix" |
| 378 | # endif /* KERNEL_FILE */ |
| 379 | |
| 380 | # ifndef LDAV_SYMBOL |
| 381 | # define LDAV_SYMBOL "_avenrun" |
| 382 | # endif /* LDAV_SYMBOL */ |
| 383 | # endif /* __linux__ */ |
| 384 | |
| 385 | # else /* __VMS */ |
| 386 | |
| 387 | # ifndef eunice |
| 388 | # include <iodef.h> |
| 389 | # include <descrip.h> |
| 390 | # else /* eunice */ |
| 391 | # include <vms/iodef.h> |
| 392 | # endif /* eunice */ |
| 393 | # endif /* __VMS */ |
| 394 | |
| 395 | # ifndef LDAV_CVT |
| 396 | # define LDAV_CVT(n) ((double) (n)) |
| 397 | # endif /* !LDAV_CVT */ |
| 398 | |
| 399 | # endif /* LOAD_AVE_TYPE */ |
| 400 | |
| 401 | # if defined HAVE_LIBPERFSTAT |
| 402 | # include <sys/protosw.h> |
| 403 | # include <libperfstat.h> |
| 404 | # include <sys/proc.h> |
| 405 | # ifndef SBITS |
| 406 | # define SBITS 16 |
| 407 | # endif |
| 408 | # endif |
| 409 | |
| 410 | # if defined (__GNU__) && !defined (NeXT) |
| 411 | /* Note that NeXT Openstep defines __GNU__ even though it should not. */ |
| 412 | /* GNU system acts much like NeXT, for load average purposes, |
| 413 | but not exactly. */ |
| 414 | # define NeXT |
| 415 | # define host_self mach_host_self |
| 416 | # endif |
| 417 | |
| 418 | # ifdef NeXT |
| 419 | # ifdef HAVE_MACH_MACH_H |
| 420 | # include <mach/mach.h> |
| 421 | # else |
| 422 | # include <mach.h> |
| 423 | # endif |
| 424 | # endif /* NeXT */ |
| 425 | |
| 426 | # ifdef sgi |
| 427 | # include <sys/sysmp.h> |
| 428 | # endif /* sgi */ |
| 429 | |
| 430 | # ifdef UMAX |
| 431 | # include <signal.h> |
| 432 | # include <sys/time.h> |
| 433 | # include <sys/wait.h> |
| 434 | # include <sys/syscall.h> |
| 435 | |
| 436 | # ifdef UMAX_43 |
| 437 | # include <machine/cpu.h> |
| 438 | # include <inq_stats/statistics.h> |
| 439 | # include <inq_stats/sysstats.h> |
| 440 | # include <inq_stats/cpustats.h> |
| 441 | # include <inq_stats/procstats.h> |
| 442 | # else /* Not UMAX_43. */ |
| 443 | # include <sys/sysdefs.h> |
| 444 | # include <sys/statistics.h> |
| 445 | # include <sys/sysstats.h> |
| 446 | # include <sys/cpudefs.h> |
| 447 | # include <sys/cpustats.h> |
| 448 | # include <sys/procstats.h> |
| 449 | # endif /* Not UMAX_43. */ |
| 450 | # endif /* UMAX */ |
| 451 | |
| 452 | # ifdef DGUX |
| 453 | # include <sys/dg_sys_info.h> |
| 454 | # endif |
| 455 | |
| 456 | # if (defined __linux__ || defined __CYGWIN__ || defined SUNOS_5 \ |
| 457 | || (defined LOAD_AVE_TYPE && ! defined __VMS)) |
| 458 | # include <fcntl.h> |
| 459 | # endif |
| 460 | \f |
| 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 bool 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 | /* True if channel is valid. */ |
| 481 | static bool 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 name_list[2]; |
| 487 | # endif |
| 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 (setting errno) 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 | errno = ENOSYS; |
| 508 | elem = -1; |
| 509 | # endif |
| 510 | |
| 511 | # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) /* Solaris <= 2.6 */ |
| 512 | /* Use libkstat because we don't have to be root. */ |
| 513 | # define LDAV_DONE |
| 514 | kstat_ctl_t *kc; |
| 515 | kstat_t *ksp; |
| 516 | kstat_named_t *kn; |
| 517 | int saved_errno; |
| 518 | |
| 519 | kc = kstat_open (); |
| 520 | if (kc == 0) |
| 521 | return -1; |
| 522 | ksp = kstat_lookup (kc, "unix", 0, "system_misc"); |
| 523 | if (ksp == 0) |
| 524 | return -1; |
| 525 | if (kstat_read (kc, ksp, 0) == -1) |
| 526 | return -1; |
| 527 | |
| 528 | |
| 529 | kn = kstat_data_lookup (ksp, "avenrun_1min"); |
| 530 | if (kn == 0) |
| 531 | { |
| 532 | /* Return -1 if no load average information is available. */ |
| 533 | nelem = 0; |
| 534 | elem = -1; |
| 535 | } |
| 536 | |
| 537 | if (nelem >= 1) |
| 538 | loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 539 | |
| 540 | if (nelem >= 2) |
| 541 | { |
| 542 | kn = kstat_data_lookup (ksp, "avenrun_5min"); |
| 543 | if (kn != 0) |
| 544 | { |
| 545 | loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 546 | |
| 547 | if (nelem >= 3) |
| 548 | { |
| 549 | kn = kstat_data_lookup (ksp, "avenrun_15min"); |
| 550 | if (kn != 0) |
| 551 | loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 552 | } |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | saved_errno = errno; |
| 557 | kstat_close (kc); |
| 558 | errno = saved_errno; |
| 559 | # endif /* HAVE_LIBKSTAT */ |
| 560 | |
| 561 | # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
| 562 | /* HP-UX */ |
| 563 | /* Use pstat_getdynamic() because we don't have to be root. */ |
| 564 | # define LDAV_DONE |
| 565 | # undef LOAD_AVE_TYPE |
| 566 | |
| 567 | struct pst_dynamic dyn_info; |
| 568 | if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0) |
| 569 | return -1; |
| 570 | if (nelem > 0) |
| 571 | loadavg[elem++] = dyn_info.psd_avg_1_min; |
| 572 | if (nelem > 1) |
| 573 | loadavg[elem++] = dyn_info.psd_avg_5_min; |
| 574 | if (nelem > 2) |
| 575 | loadavg[elem++] = dyn_info.psd_avg_15_min; |
| 576 | |
| 577 | # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ |
| 578 | |
| 579 | # if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT /* AIX */ |
| 580 | # define LDAV_DONE |
| 581 | # undef LOAD_AVE_TYPE |
| 582 | /* Use perfstat_cpu_total because we don't have to be root. */ |
| 583 | { |
| 584 | perfstat_cpu_total_t cpu_stats; |
| 585 | int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1); |
| 586 | if (result == -1) |
| 587 | return result; |
| 588 | loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS); |
| 589 | loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS); |
| 590 | loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS); |
| 591 | elem = 3; |
| 592 | } |
| 593 | # endif |
| 594 | |
| 595 | # if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) |
| 596 | /* Linux without glibc, Cygwin */ |
| 597 | # define LDAV_DONE |
| 598 | # undef LOAD_AVE_TYPE |
| 599 | |
| 600 | # ifndef LINUX_LDAV_FILE |
| 601 | # define LINUX_LDAV_FILE "/proc/loadavg" |
| 602 | # endif |
| 603 | |
| 604 | char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")]; |
| 605 | char const *ptr = ldavgbuf; |
| 606 | int fd, count, saved_errno; |
| 607 | |
| 608 | fd = open (LINUX_LDAV_FILE, O_RDONLY); |
| 609 | if (fd == -1) |
| 610 | return -1; |
| 611 | count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); |
| 612 | saved_errno = errno; |
| 613 | (void) close (fd); |
| 614 | errno = saved_errno; |
| 615 | if (count <= 0) |
| 616 | return -1; |
| 617 | ldavgbuf[count] = '\0'; |
| 618 | |
| 619 | for (elem = 0; elem < nelem; elem++) |
| 620 | { |
| 621 | double numerator = 0; |
| 622 | double denominator = 1; |
| 623 | |
| 624 | while (*ptr == ' ') |
| 625 | ptr++; |
| 626 | |
| 627 | /* Finish if this number is missing, and report an error if all |
| 628 | were missing. */ |
| 629 | if (! ('0' <= *ptr && *ptr <= '9')) |
| 630 | { |
| 631 | if (elem == 0) |
| 632 | { |
| 633 | errno = ENOTSUP; |
| 634 | return -1; |
| 635 | } |
| 636 | break; |
| 637 | } |
| 638 | |
| 639 | while ('0' <= *ptr && *ptr <= '9') |
| 640 | numerator = 10 * numerator + (*ptr++ - '0'); |
| 641 | |
| 642 | if (*ptr == '.') |
| 643 | for (ptr++; '0' <= *ptr && *ptr <= '9'; ptr++) |
| 644 | numerator = 10 * numerator + (*ptr - '0'), denominator *= 10; |
| 645 | |
| 646 | loadavg[elem++] = numerator / denominator; |
| 647 | } |
| 648 | |
| 649 | return elem; |
| 650 | |
| 651 | # endif /* __linux__ || __CYGWIN__ */ |
| 652 | |
| 653 | # if !defined (LDAV_DONE) && defined (__NetBSD__) /* NetBSD < 0.9 */ |
| 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 | { |
| 674 | errno = ENOTSUP; |
| 675 | return -1; |
| 676 | } |
| 677 | |
| 678 | for (elem = 0; elem < nelem; elem++) |
| 679 | loadavg[elem] = (double) load_ave[elem] / (double) scale; |
| 680 | |
| 681 | return elem; |
| 682 | |
| 683 | # endif /* __NetBSD__ */ |
| 684 | |
| 685 | # if !defined (LDAV_DONE) && defined (NeXT) /* NeXTStep */ |
| 686 | # define LDAV_DONE |
| 687 | /* The NeXT code was adapted from iscreen 3.2. */ |
| 688 | |
| 689 | host_t host; |
| 690 | struct processor_set_basic_info info; |
| 691 | unsigned int info_count; |
| 692 | |
| 693 | /* We only know how to get the 1-minute average for this system, |
| 694 | so even if the caller asks for more than 1, we only return 1. */ |
| 695 | |
| 696 | if (!getloadavg_initialized) |
| 697 | { |
| 698 | if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) |
| 699 | getloadavg_initialized = true; |
| 700 | } |
| 701 | |
| 702 | if (getloadavg_initialized) |
| 703 | { |
| 704 | info_count = PROCESSOR_SET_BASIC_INFO_COUNT; |
| 705 | if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, |
| 706 | (processor_set_info_t) &info, &info_count) |
| 707 | != KERN_SUCCESS) |
| 708 | getloadavg_initialized = false; |
| 709 | else |
| 710 | { |
| 711 | if (nelem > 0) |
| 712 | loadavg[elem++] = (double) info.load_average / LOAD_SCALE; |
| 713 | } |
| 714 | } |
| 715 | |
| 716 | if (!getloadavg_initialized) |
| 717 | { |
| 718 | errno = ENOTSUP; |
| 719 | return -1; |
| 720 | } |
| 721 | # endif /* NeXT */ |
| 722 | |
| 723 | # if !defined (LDAV_DONE) && defined (UMAX) |
| 724 | # define LDAV_DONE |
| 725 | /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not |
| 726 | have a /dev/kmem. Information about the workings of the running kernel |
| 727 | can be gathered with inq_stats system calls. |
| 728 | We only know how to get the 1-minute average for this system. */ |
| 729 | |
| 730 | struct proc_summary proc_sum_data; |
| 731 | struct stat_descr proc_info; |
| 732 | double load; |
| 733 | register unsigned int i, j; |
| 734 | |
| 735 | if (cpus == 0) |
| 736 | { |
| 737 | register unsigned int c, i; |
| 738 | struct cpu_config conf; |
| 739 | struct stat_descr desc; |
| 740 | |
| 741 | desc.sd_next = 0; |
| 742 | desc.sd_subsys = SUBSYS_CPU; |
| 743 | desc.sd_type = CPUTYPE_CONFIG; |
| 744 | desc.sd_addr = (char *) &conf; |
| 745 | desc.sd_size = sizeof conf; |
| 746 | |
| 747 | if (inq_stats (1, &desc)) |
| 748 | return -1; |
| 749 | |
| 750 | c = 0; |
| 751 | for (i = 0; i < conf.config_maxclass; ++i) |
| 752 | { |
| 753 | struct class_stats stats; |
| 754 | memset (&stats, 0, sizeof stats); |
| 755 | |
| 756 | desc.sd_type = CPUTYPE_CLASS; |
| 757 | desc.sd_objid = i; |
| 758 | desc.sd_addr = (char *) &stats; |
| 759 | desc.sd_size = sizeof stats; |
| 760 | |
| 761 | if (inq_stats (1, &desc)) |
| 762 | return -1; |
| 763 | |
| 764 | c += stats.class_numcpus; |
| 765 | } |
| 766 | cpus = c; |
| 767 | samples = cpus < 2 ? 3 : (2 * cpus / 3); |
| 768 | } |
| 769 | |
| 770 | proc_info.sd_next = 0; |
| 771 | proc_info.sd_subsys = SUBSYS_PROC; |
| 772 | proc_info.sd_type = PROCTYPE_SUMMARY; |
| 773 | proc_info.sd_addr = (char *) &proc_sum_data; |
| 774 | proc_info.sd_size = sizeof (struct proc_summary); |
| 775 | proc_info.sd_sizeused = 0; |
| 776 | |
| 777 | if (inq_stats (1, &proc_info) != 0) |
| 778 | return -1; |
| 779 | |
| 780 | load = proc_sum_data.ps_nrunnable; |
| 781 | j = 0; |
| 782 | for (i = samples - 1; i > 0; --i) |
| 783 | { |
| 784 | load += proc_sum_data.ps_nrun[j]; |
| 785 | if (j++ == PS_NRUNSIZE) |
| 786 | j = 0; |
| 787 | } |
| 788 | |
| 789 | if (nelem > 0) |
| 790 | loadavg[elem++] = load / samples / cpus; |
| 791 | # endif /* UMAX */ |
| 792 | |
| 793 | # if !defined (LDAV_DONE) && defined (DGUX) |
| 794 | # define LDAV_DONE |
| 795 | /* This call can return -1 for an error, but with good args |
| 796 | it's not supposed to fail. The first argument is for no |
| 797 | apparent reason of type `long int *'. */ |
| 798 | dg_sys_info ((long int *) &load_info, |
| 799 | DG_SYS_INFO_LOAD_INFO_TYPE, |
| 800 | DG_SYS_INFO_LOAD_VERSION_0); |
| 801 | |
| 802 | if (nelem > 0) |
| 803 | loadavg[elem++] = load_info.one_minute; |
| 804 | if (nelem > 1) |
| 805 | loadavg[elem++] = load_info.five_minute; |
| 806 | if (nelem > 2) |
| 807 | loadavg[elem++] = load_info.fifteen_minute; |
| 808 | # endif /* DGUX */ |
| 809 | |
| 810 | # if !defined (LDAV_DONE) && defined (apollo) |
| 811 | # define LDAV_DONE |
| 812 | /* Apollo code from lisch@mentorg.com (Ray Lischner). |
| 813 | |
| 814 | This system call is not documented. The load average is obtained as |
| 815 | three long integers, for the load average over the past minute, |
| 816 | five minutes, and fifteen minutes. Each value is a scaled integer, |
| 817 | with 16 bits of integer part and 16 bits of fraction part. |
| 818 | |
| 819 | I'm not sure which operating system first supported this system call, |
| 820 | but I know that SR10.2 supports it. */ |
| 821 | |
| 822 | extern void proc1_$get_loadav (); |
| 823 | unsigned long load_ave[3]; |
| 824 | |
| 825 | proc1_$get_loadav (load_ave); |
| 826 | |
| 827 | if (nelem > 0) |
| 828 | loadavg[elem++] = load_ave[0] / 65536.0; |
| 829 | if (nelem > 1) |
| 830 | loadavg[elem++] = load_ave[1] / 65536.0; |
| 831 | if (nelem > 2) |
| 832 | loadavg[elem++] = load_ave[2] / 65536.0; |
| 833 | # endif /* apollo */ |
| 834 | |
| 835 | # if !defined (LDAV_DONE) && defined (OSF_MIPS) |
| 836 | # define LDAV_DONE |
| 837 | |
| 838 | struct tbl_loadavg load_ave; |
| 839 | table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); |
| 840 | loadavg[elem++] |
| 841 | = (load_ave.tl_lscale == 0 |
| 842 | ? load_ave.tl_avenrun.d[0] |
| 843 | : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); |
| 844 | # endif /* OSF_MIPS */ |
| 845 | |
| 846 | # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) |
| 847 | /* DJGPP */ |
| 848 | # define LDAV_DONE |
| 849 | |
| 850 | /* A faithful emulation is going to have to be saved for a rainy day. */ |
| 851 | for ( ; elem < nelem; elem++) |
| 852 | { |
| 853 | loadavg[elem] = 0.0; |
| 854 | } |
| 855 | # endif /* __MSDOS__ || WINDOWS32 */ |
| 856 | |
| 857 | # if !defined (LDAV_DONE) && defined (OSF_ALPHA) /* OSF/1 */ |
| 858 | # define LDAV_DONE |
| 859 | |
| 860 | struct tbl_loadavg load_ave; |
| 861 | table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); |
| 862 | for (elem = 0; elem < nelem; elem++) |
| 863 | loadavg[elem] |
| 864 | = (load_ave.tl_lscale == 0 |
| 865 | ? load_ave.tl_avenrun.d[elem] |
| 866 | : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale)); |
| 867 | # endif /* OSF_ALPHA */ |
| 868 | |
| 869 | # if ! defined LDAV_DONE && defined __VMS /* VMS */ |
| 870 | /* VMS specific code -- read from the Load Ave driver. */ |
| 871 | |
| 872 | LOAD_AVE_TYPE load_ave[3]; |
| 873 | static bool getloadavg_initialized; |
| 874 | # ifdef eunice |
| 875 | struct |
| 876 | { |
| 877 | int dsc$w_length; |
| 878 | char *dsc$a_pointer; |
| 879 | } descriptor; |
| 880 | # endif |
| 881 | |
| 882 | /* Ensure that there is a channel open to the load ave device. */ |
| 883 | if (!getloadavg_initialized) |
| 884 | { |
| 885 | /* Attempt to open the channel. */ |
| 886 | # ifdef eunice |
| 887 | descriptor.dsc$w_length = 18; |
| 888 | descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; |
| 889 | # else |
| 890 | $DESCRIPTOR (descriptor, "LAV0:"); |
| 891 | # endif |
| 892 | if (sys$assign (&descriptor, &channel, 0, 0) & 1) |
| 893 | getloadavg_initialized = true; |
| 894 | } |
| 895 | |
| 896 | /* Read the load average vector. */ |
| 897 | if (getloadavg_initialized |
| 898 | && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, |
| 899 | load_ave, 12, 0, 0, 0, 0) & 1)) |
| 900 | { |
| 901 | sys$dassgn (channel); |
| 902 | getloadavg_initialized = false; |
| 903 | } |
| 904 | |
| 905 | if (!getloadavg_initialized) |
| 906 | { |
| 907 | errno = ENOTSUP; |
| 908 | return -1; |
| 909 | } |
| 910 | # endif /* ! defined LDAV_DONE && defined __VMS */ |
| 911 | |
| 912 | # if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS |
| 913 | /* IRIX, other old systems */ |
| 914 | |
| 915 | /* UNIX-specific code -- read the average from /dev/kmem. */ |
| 916 | |
| 917 | # define LDAV_PRIVILEGED /* This code requires special installation. */ |
| 918 | |
| 919 | LOAD_AVE_TYPE load_ave[3]; |
| 920 | |
| 921 | /* Get the address of LDAV_SYMBOL. */ |
| 922 | if (offset == 0) |
| 923 | { |
| 924 | # ifndef sgi |
| 925 | # if ! defined NLIST_STRUCT || ! defined N_NAME_POINTER |
| 926 | strcpy (name_list[0].n_name, LDAV_SYMBOL); |
| 927 | strcpy (name_list[1].n_name, ""); |
| 928 | # else /* NLIST_STRUCT */ |
| 929 | # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME |
| 930 | name_list[0].n_un.n_name = LDAV_SYMBOL; |
| 931 | name_list[1].n_un.n_name = 0; |
| 932 | # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
| 933 | name_list[0].n_name = LDAV_SYMBOL; |
| 934 | name_list[1].n_name = 0; |
| 935 | # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
| 936 | # endif /* NLIST_STRUCT */ |
| 937 | |
| 938 | # ifndef SUNOS_5 |
| 939 | if ( |
| 940 | # if !(defined (_AIX) && !defined (ps2)) |
| 941 | nlist (KERNEL_FILE, name_list) |
| 942 | # else /* _AIX */ |
| 943 | knlist (name_list, 1, sizeof (name_list[0])) |
| 944 | # endif |
| 945 | >= 0) |
| 946 | /* Omit "&& name_list[0].n_type != 0 " -- it breaks on Sun386i. */ |
| 947 | { |
| 948 | # ifdef FIXUP_KERNEL_SYMBOL_ADDR |
| 949 | FIXUP_KERNEL_SYMBOL_ADDR (name_list); |
| 950 | # endif |
| 951 | offset = name_list[0].n_value; |
| 952 | } |
| 953 | # endif /* !SUNOS_5 */ |
| 954 | # else /* sgi */ |
| 955 | ptrdiff_t ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); |
| 956 | if (ldav_off != -1) |
| 957 | offset = (long int) ldav_off & 0x7fffffff; |
| 958 | # endif /* sgi */ |
| 959 | } |
| 960 | |
| 961 | /* Make sure we have /dev/kmem open. */ |
| 962 | if (!getloadavg_initialized) |
| 963 | { |
| 964 | # ifndef SUNOS_5 |
| 965 | /* Set the channel to close on exec, so it does not |
| 966 | litter any child's descriptor table. */ |
| 967 | # ifndef O_CLOEXEC |
| 968 | # define O_CLOEXEC 0 |
| 969 | # endif |
| 970 | int fd = open ("/dev/kmem", O_RDONLY | O_CLOEXEC); |
| 971 | if (0 <= fd) |
| 972 | { |
| 973 | # if F_DUPFD_CLOEXEC |
| 974 | if (fd <= STDERR_FILENO) |
| 975 | { |
| 976 | int fd1 = fcntl (fd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1); |
| 977 | close (fd); |
| 978 | fd = fd1; |
| 979 | } |
| 980 | # endif |
| 981 | if (0 <= fd) |
| 982 | { |
| 983 | channel = fd; |
| 984 | getloadavg_initialized = true; |
| 985 | } |
| 986 | } |
| 987 | # else /* SUNOS_5 */ |
| 988 | /* We pass 0 for the kernel, corefile, and swapfile names |
| 989 | to use the currently running kernel. */ |
| 990 | kd = kvm_open (0, 0, 0, O_RDONLY, 0); |
| 991 | if (kd != 0) |
| 992 | { |
| 993 | /* nlist the currently running kernel. */ |
| 994 | kvm_nlist (kd, name_list); |
| 995 | offset = name_list[0].n_value; |
| 996 | getloadavg_initialized = true; |
| 997 | } |
| 998 | # endif /* SUNOS_5 */ |
| 999 | } |
| 1000 | |
| 1001 | /* If we can, get the load average values. */ |
| 1002 | if (offset && getloadavg_initialized) |
| 1003 | { |
| 1004 | /* Try to read the load. */ |
| 1005 | # ifndef SUNOS_5 |
| 1006 | if (lseek (channel, offset, 0) == -1L |
| 1007 | || read (channel, (char *) load_ave, sizeof (load_ave)) |
| 1008 | != sizeof (load_ave)) |
| 1009 | { |
| 1010 | close (channel); |
| 1011 | getloadavg_initialized = false; |
| 1012 | } |
| 1013 | # else /* SUNOS_5 */ |
| 1014 | if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) |
| 1015 | != sizeof (load_ave)) |
| 1016 | { |
| 1017 | kvm_close (kd); |
| 1018 | getloadavg_initialized = false; |
| 1019 | } |
| 1020 | # endif /* SUNOS_5 */ |
| 1021 | } |
| 1022 | |
| 1023 | if (offset == 0 || !getloadavg_initialized) |
| 1024 | { |
| 1025 | errno = ENOTSUP; |
| 1026 | return -1; |
| 1027 | } |
| 1028 | # endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ |
| 1029 | |
| 1030 | # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ |
| 1031 | if (nelem > 0) |
| 1032 | loadavg[elem++] = LDAV_CVT (load_ave[0]); |
| 1033 | if (nelem > 1) |
| 1034 | loadavg[elem++] = LDAV_CVT (load_ave[1]); |
| 1035 | if (nelem > 2) |
| 1036 | loadavg[elem++] = LDAV_CVT (load_ave[2]); |
| 1037 | |
| 1038 | # define LDAV_DONE |
| 1039 | # endif /* !LDAV_DONE && LOAD_AVE_TYPE */ |
| 1040 | |
| 1041 | # if !defined LDAV_DONE |
| 1042 | errno = ENOSYS; |
| 1043 | elem = -1; |
| 1044 | # endif |
| 1045 | return elem; |
| 1046 | } |