| 1 | /* Get the system load averages. |
| 2 | Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93 |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 18 | |
| 19 | /* Compile-time symbols that this file uses: |
| 20 | |
| 21 | FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. |
| 22 | KERNEL_FILE Pathname of the kernel to nlist. |
| 23 | LDAV_CVT() Scale the load average from the kernel. |
| 24 | Returns a double. |
| 25 | LDAV_SYMBOL Name of kernel symbol giving load average. |
| 26 | LOAD_AVE_TYPE Type of the load average array in the kernel. |
| 27 | Must be defined unless one of |
| 28 | apollo, DGUX, NeXT, or UMAX is defined; |
| 29 | otherwise, no load average is available. |
| 30 | NLIST_STRUCT Include nlist.h, not a.out.h, and |
| 31 | the nlist n_name element is a pointer, |
| 32 | not an array. |
| 33 | NLIST_NAME_UNION struct nlist has an n_un member, not n_name. |
| 34 | LINUX_LDAV_FILE [__linux__]: File containing load averages. |
| 35 | |
| 36 | Specific system predefines this file uses, aside from setting |
| 37 | default values if not emacs: |
| 38 | |
| 39 | apollo |
| 40 | BSD Real BSD, not just BSD-like. |
| 41 | DGUX |
| 42 | eunice UNIX emulator under VMS. |
| 43 | hpux |
| 44 | NeXT |
| 45 | sgi |
| 46 | sequent Sequent Dynix 3.x.x (BSD) |
| 47 | _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) |
| 48 | sony_news NEWS-OS (works at least for 4.1C) |
| 49 | UMAX |
| 50 | UMAX4_3 |
| 51 | VMS |
| 52 | __linux__ Linux: assumes /proc filesystem mounted. |
| 53 | Support from Michael K. Johnson. |
| 54 | __NetBSD__ NetBSD: assumes /kern filesystem mounted. |
| 55 | |
| 56 | In addition, to avoid nesting many #ifdefs, we internally set |
| 57 | LDAV_DONE to indicate that the load average has been computed. |
| 58 | |
| 59 | We also #define LDAV_PRIVILEGED if a program will require |
| 60 | special installation to be able to call getloadavg. */ |
| 61 | |
| 62 | #include <sys/types.h> |
| 63 | |
| 64 | /* Both the Emacs and non-Emacs sections want this. Some |
| 65 | configuration files' definitions for the LOAD_AVE_CVT macro (like |
| 66 | sparc.h's) use macros like FSCALE, defined here. */ |
| 67 | #ifdef unix |
| 68 | #include <sys/param.h> |
| 69 | #endif |
| 70 | |
| 71 | |
| 72 | #ifdef HAVE_CONFIG_H |
| 73 | #if defined (emacs) || defined (CONFIG_BROKETS) |
| 74 | /* We use <config.h> instead of "config.h" so that a compilation |
| 75 | using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h |
| 76 | (which it would do because it found this file in $srcdir). */ |
| 77 | #include <config.h> |
| 78 | #else |
| 79 | #include "config.h" |
| 80 | #endif |
| 81 | #endif |
| 82 | |
| 83 | |
| 84 | /* Exclude all the code except the test program at the end |
| 85 | if the system has its own `getloadavg' function. */ |
| 86 | |
| 87 | #ifndef HAVE_GETLOADAVG |
| 88 | |
| 89 | |
| 90 | /* The existing Emacs configuration files define a macro called |
| 91 | LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and |
| 92 | returns the load average multiplied by 100. What we actually want |
| 93 | is a macro called LDAV_CVT, which returns the load average as an |
| 94 | unmultiplied double. |
| 95 | |
| 96 | For backwards compatibility, we'll define LDAV_CVT in terms of |
| 97 | LOAD_AVE_CVT, but future machine config files should just define |
| 98 | LDAV_CVT directly. */ |
| 99 | |
| 100 | #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT) |
| 101 | #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) |
| 102 | #endif |
| 103 | |
| 104 | #if !defined (BSD) && defined (ultrix) |
| 105 | /* Ultrix behaves like BSD on Vaxen. */ |
| 106 | #define BSD |
| 107 | #endif |
| 108 | |
| 109 | #ifdef NeXT |
| 110 | /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which |
| 111 | conflicts with the definition understood in this file, that this |
| 112 | really is BSD. */ |
| 113 | #undef BSD |
| 114 | |
| 115 | /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being |
| 116 | defined to mean that the nlist method should be used, which is not true. */ |
| 117 | #undef FSCALE |
| 118 | #endif |
| 119 | |
| 120 | /* Set values that are different from the defaults, which are |
| 121 | set a little farther down with #ifndef. */ |
| 122 | |
| 123 | |
| 124 | /* Some shorthands. */ |
| 125 | |
| 126 | #if defined (HPUX) && !defined (hpux) |
| 127 | #define hpux |
| 128 | #endif |
| 129 | |
| 130 | #if defined(hp300) && !defined(hpux) |
| 131 | #define MORE_BSD |
| 132 | #endif |
| 133 | |
| 134 | #if defined(ultrix) && defined(mips) |
| 135 | #define decstation |
| 136 | #endif |
| 137 | |
| 138 | #if defined(sun) && defined(SVR4) |
| 139 | #define SUNOS_5 |
| 140 | #endif |
| 141 | |
| 142 | #if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) |
| 143 | #define OSF_ALPHA |
| 144 | #endif |
| 145 | |
| 146 | #if defined (__osf__) && (defined (mips) || defined (__mips__)) |
| 147 | #define OSF_MIPS |
| 148 | #include <sys/table.h> |
| 149 | #endif |
| 150 | |
| 151 | /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by |
| 152 | default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine |
| 153 | that with a couple of other things and we'll have a unique match. */ |
| 154 | #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) |
| 155 | #define tek4300 /* Define by emacs, but not by other users. */ |
| 156 | #endif |
| 157 | |
| 158 | |
| 159 | /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ |
| 160 | #ifndef LOAD_AVE_TYPE |
| 161 | |
| 162 | #ifdef MORE_BSD |
| 163 | #define LOAD_AVE_TYPE long |
| 164 | #endif |
| 165 | |
| 166 | #ifdef sun |
| 167 | #define LOAD_AVE_TYPE long |
| 168 | #endif |
| 169 | |
| 170 | #ifdef decstation |
| 171 | #define LOAD_AVE_TYPE long |
| 172 | #endif |
| 173 | |
| 174 | #ifdef _SEQUENT_ |
| 175 | #define LOAD_AVE_TYPE long |
| 176 | #endif |
| 177 | |
| 178 | #ifdef sgi |
| 179 | #define LOAD_AVE_TYPE long |
| 180 | #endif |
| 181 | |
| 182 | #ifdef SVR4 |
| 183 | #define LOAD_AVE_TYPE long |
| 184 | #endif |
| 185 | |
| 186 | #ifdef sony_news |
| 187 | #define LOAD_AVE_TYPE long |
| 188 | #endif |
| 189 | |
| 190 | #ifdef sequent |
| 191 | #define LOAD_AVE_TYPE long |
| 192 | #endif |
| 193 | |
| 194 | #ifdef OSF_ALPHA |
| 195 | #define LOAD_AVE_TYPE long |
| 196 | #endif |
| 197 | |
| 198 | #if defined (ardent) && defined (titan) |
| 199 | #define LOAD_AVE_TYPE long |
| 200 | #endif |
| 201 | |
| 202 | #ifdef tek4300 |
| 203 | #define LOAD_AVE_TYPE long |
| 204 | #endif |
| 205 | |
| 206 | #endif /* No LOAD_AVE_TYPE. */ |
| 207 | |
| 208 | #ifdef OSF_ALPHA |
| 209 | /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, |
| 210 | according to ghazi@noc.rutgers.edu. */ |
| 211 | #undef FSCALE |
| 212 | #define FSCALE 1024.0 |
| 213 | #endif |
| 214 | |
| 215 | |
| 216 | #ifndef FSCALE |
| 217 | |
| 218 | /* SunOS and some others define FSCALE in sys/param.h. */ |
| 219 | |
| 220 | #ifdef MORE_BSD |
| 221 | #define FSCALE 2048.0 |
| 222 | #endif |
| 223 | |
| 224 | #if defined(MIPS) || defined(SVR4) || defined(decstation) |
| 225 | #define FSCALE 256 |
| 226 | #endif |
| 227 | |
| 228 | #if defined (sgi) || defined (sequent) |
| 229 | /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined |
| 230 | above under #ifdef MIPS. But we want the sgi value. */ |
| 231 | #undef FSCALE |
| 232 | #define FSCALE 1000.0 |
| 233 | #endif |
| 234 | |
| 235 | #if defined (ardent) && defined (titan) |
| 236 | #define FSCALE 65536.0 |
| 237 | #endif |
| 238 | |
| 239 | #ifdef tek4300 |
| 240 | #define FSCALE 100.0 |
| 241 | #endif |
| 242 | |
| 243 | #endif /* Not FSCALE. */ |
| 244 | |
| 245 | #if !defined (LDAV_CVT) && defined (FSCALE) |
| 246 | #define LDAV_CVT(n) (((double) (n)) / FSCALE) |
| 247 | #endif |
| 248 | |
| 249 | /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */ |
| 250 | #ifndef NLIST_STRUCT |
| 251 | |
| 252 | #ifdef MORE_BSD |
| 253 | #define NLIST_STRUCT |
| 254 | #endif |
| 255 | |
| 256 | #ifdef sun |
| 257 | #define NLIST_STRUCT |
| 258 | #endif |
| 259 | |
| 260 | #ifdef decstation |
| 261 | #define NLIST_STRUCT |
| 262 | #endif |
| 263 | |
| 264 | #ifdef hpux |
| 265 | #define NLIST_STRUCT |
| 266 | #endif |
| 267 | |
| 268 | #if defined (_SEQUENT_) || defined (sequent) |
| 269 | #define NLIST_STRUCT |
| 270 | #endif |
| 271 | |
| 272 | #ifdef sgi |
| 273 | #define NLIST_STRUCT |
| 274 | #endif |
| 275 | |
| 276 | #ifdef SVR4 |
| 277 | #define NLIST_STRUCT |
| 278 | #endif |
| 279 | |
| 280 | #ifdef sony_news |
| 281 | #define NLIST_STRUCT |
| 282 | #endif |
| 283 | |
| 284 | #ifdef OSF_ALPHA |
| 285 | #define NLIST_STRUCT |
| 286 | #endif |
| 287 | |
| 288 | #if defined (ardent) && defined (titan) |
| 289 | #define NLIST_STRUCT |
| 290 | #endif |
| 291 | |
| 292 | #ifdef tex4300 |
| 293 | #define NLIST_STRUCT |
| 294 | #endif |
| 295 | |
| 296 | #ifdef butterfly |
| 297 | #define NLIST_STRUCT |
| 298 | #endif |
| 299 | |
| 300 | #endif /* defined (NLIST_STRUCT) */ |
| 301 | |
| 302 | |
| 303 | #if defined(sgi) || (defined(mips) && !defined(BSD)) |
| 304 | #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) |
| 305 | #endif |
| 306 | |
| 307 | |
| 308 | #if !defined (KERNEL_FILE) && defined (sequent) |
| 309 | #define KERNEL_FILE "/dynix" |
| 310 | #endif |
| 311 | |
| 312 | #if !defined (KERNEL_FILE) && defined (hpux) |
| 313 | #define KERNEL_FILE "/hp-ux" |
| 314 | #endif |
| 315 | |
| 316 | #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan))) |
| 317 | #define KERNEL_FILE "/unix" |
| 318 | #endif |
| 319 | |
| 320 | |
| 321 | #if !defined (LDAV_SYMBOL) && defined (alliant) |
| 322 | #define LDAV_SYMBOL "_Loadavg" |
| 323 | #endif |
| 324 | |
| 325 | #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan))) |
| 326 | #define LDAV_SYMBOL "avenrun" |
| 327 | #endif |
| 328 | |
| 329 | #ifdef HAVE_UNISTD_H |
| 330 | #include <unistd.h> |
| 331 | #endif |
| 332 | |
| 333 | #include <stdio.h> |
| 334 | #include <errno.h> |
| 335 | |
| 336 | #ifndef errno |
| 337 | extern int errno; |
| 338 | #endif |
| 339 | |
| 340 | /* LOAD_AVE_TYPE should only get defined if we're going to use the |
| 341 | nlist method. */ |
| 342 | #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) |
| 343 | #define LOAD_AVE_TYPE double |
| 344 | #endif |
| 345 | |
| 346 | #ifdef LOAD_AVE_TYPE |
| 347 | |
| 348 | #ifndef VMS |
| 349 | #ifndef NLIST_STRUCT |
| 350 | #include <a.out.h> |
| 351 | #else /* NLIST_STRUCT */ |
| 352 | #include <nlist.h> |
| 353 | #endif /* NLIST_STRUCT */ |
| 354 | |
| 355 | #ifdef SUNOS_5 |
| 356 | #include <fcntl.h> |
| 357 | #include <kvm.h> |
| 358 | #endif |
| 359 | |
| 360 | #ifndef KERNEL_FILE |
| 361 | #define KERNEL_FILE "/vmunix" |
| 362 | #endif /* KERNEL_FILE */ |
| 363 | |
| 364 | #ifndef LDAV_SYMBOL |
| 365 | #define LDAV_SYMBOL "_avenrun" |
| 366 | #endif /* LDAV_SYMBOL */ |
| 367 | |
| 368 | #else /* VMS */ |
| 369 | |
| 370 | #ifndef eunice |
| 371 | #include <iodef.h> |
| 372 | #include <descrip.h> |
| 373 | #else /* eunice */ |
| 374 | #include <vms/iodef.h> |
| 375 | #endif /* eunice */ |
| 376 | #endif /* VMS */ |
| 377 | |
| 378 | #ifndef LDAV_CVT |
| 379 | #define LDAV_CVT(n) ((double) (n)) |
| 380 | #endif /* !LDAV_CVT */ |
| 381 | |
| 382 | #endif /* LOAD_AVE_TYPE */ |
| 383 | |
| 384 | #ifdef NeXT |
| 385 | #ifdef HAVE_MACH_MACH_H |
| 386 | #include <mach/mach.h> |
| 387 | #else |
| 388 | #include <mach.h> |
| 389 | #endif |
| 390 | #endif /* NeXT */ |
| 391 | |
| 392 | #ifdef sgi |
| 393 | #include <sys/sysmp.h> |
| 394 | #endif /* sgi */ |
| 395 | |
| 396 | #ifdef UMAX |
| 397 | #include <stdio.h> |
| 398 | #include <signal.h> |
| 399 | #include <sys/time.h> |
| 400 | #include <sys/wait.h> |
| 401 | #include <sys/syscall.h> |
| 402 | |
| 403 | #ifdef UMAX_43 |
| 404 | #include <machine/cpu.h> |
| 405 | #include <inq_stats/statistics.h> |
| 406 | #include <inq_stats/sysstats.h> |
| 407 | #include <inq_stats/cpustats.h> |
| 408 | #include <inq_stats/procstats.h> |
| 409 | #else /* Not UMAX_43. */ |
| 410 | #include <sys/sysdefs.h> |
| 411 | #include <sys/statistics.h> |
| 412 | #include <sys/sysstats.h> |
| 413 | #include <sys/cpudefs.h> |
| 414 | #include <sys/cpustats.h> |
| 415 | #include <sys/procstats.h> |
| 416 | #endif /* Not UMAX_43. */ |
| 417 | #endif /* UMAX */ |
| 418 | |
| 419 | #ifdef DGUX |
| 420 | #include <sys/dg_sys_info.h> |
| 421 | #endif |
| 422 | |
| 423 | #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION) |
| 424 | #include <fcntl.h> |
| 425 | #else |
| 426 | #include <sys/file.h> |
| 427 | #endif |
| 428 | \f |
| 429 | /* Avoid static vars inside a function since in HPUX they dump as pure. */ |
| 430 | |
| 431 | #ifdef NeXT |
| 432 | static processor_set_t default_set; |
| 433 | static int getloadavg_initialized; |
| 434 | #endif /* NeXT */ |
| 435 | |
| 436 | #ifdef UMAX |
| 437 | static unsigned int cpus = 0; |
| 438 | static unsigned int samples; |
| 439 | #endif /* UMAX */ |
| 440 | |
| 441 | #ifdef DGUX |
| 442 | static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ |
| 443 | #endif /* DGUX */ |
| 444 | |
| 445 | #ifdef LOAD_AVE_TYPE |
| 446 | /* File descriptor open to /dev/kmem or VMS load ave driver. */ |
| 447 | static int channel; |
| 448 | /* Nonzero iff channel is valid. */ |
| 449 | static int getloadavg_initialized; |
| 450 | /* Offset in kmem to seek to read load average, or 0 means invalid. */ |
| 451 | static long offset; |
| 452 | |
| 453 | #if !defined(VMS) && !defined(sgi) |
| 454 | static struct nlist nl[2]; |
| 455 | #endif /* Not VMS or sgi */ |
| 456 | |
| 457 | #ifdef SUNOS_5 |
| 458 | static kvm_t *kd; |
| 459 | #endif /* SUNOS_5 */ |
| 460 | |
| 461 | #endif /* LOAD_AVE_TYPE */ |
| 462 | \f |
| 463 | /* Put the 1 minute, 5 minute and 15 minute load averages |
| 464 | into the first NELEM elements of LOADAVG. |
| 465 | Return the number written (never more than 3, but may be less than NELEM), |
| 466 | or -1 if an error occurred. */ |
| 467 | |
| 468 | int |
| 469 | getloadavg (loadavg, nelem) |
| 470 | double loadavg[]; |
| 471 | int nelem; |
| 472 | { |
| 473 | int elem = 0; /* Return value. */ |
| 474 | |
| 475 | #ifdef NO_GET_LOAD_AVG |
| 476 | #define LDAV_DONE |
| 477 | /* Set errno to zero to indicate that there was no particular error; |
| 478 | this function just can't work at all on this system. */ |
| 479 | errno = 0; |
| 480 | elem = -1; |
| 481 | #endif |
| 482 | |
| 483 | #if !defined (LDAV_DONE) && defined (__linux__) |
| 484 | #define LDAV_DONE |
| 485 | #undef LOAD_AVE_TYPE |
| 486 | |
| 487 | #ifndef LINUX_LDAV_FILE |
| 488 | #define LINUX_LDAV_FILE "/proc/loadavg" |
| 489 | #endif |
| 490 | |
| 491 | char ldavgbuf[40]; |
| 492 | double load_ave[3]; |
| 493 | int fd, count; |
| 494 | |
| 495 | fd = open (LINUX_LDAV_FILE, O_RDONLY); |
| 496 | if (fd == -1) |
| 497 | return -1; |
| 498 | count = read (fd, ldavgbuf, 40); |
| 499 | (void) close (fd); |
| 500 | if (count <= 0) |
| 501 | return -1; |
| 502 | |
| 503 | count = sscanf (ldavgbuf, "%lf %lf %lf", |
| 504 | &load_ave[0], &load_ave[1], &load_ave[2]); |
| 505 | if (count < 1) |
| 506 | return -1; |
| 507 | |
| 508 | for (elem = 0; elem < nelem && elem < count; elem++) |
| 509 | loadavg[elem] = load_ave[elem]; |
| 510 | |
| 511 | return elem; |
| 512 | |
| 513 | #endif /* __linux__ */ |
| 514 | |
| 515 | #if !defined (LDAV_DONE) && defined (__NetBSD__) |
| 516 | #define LDAV_DONE |
| 517 | #undef LOAD_AVE_TYPE |
| 518 | |
| 519 | #ifndef NETBSD_LDAV_FILE |
| 520 | #define NETBSD_LDAV_FILE "/kern/loadavg" |
| 521 | #endif |
| 522 | |
| 523 | unsigned long int load_ave[3], scale; |
| 524 | int count; |
| 525 | FILE *fp; |
| 526 | |
| 527 | fp = fopen (NETBSD_LDAV_FILE, "r"); |
| 528 | if (fp == NULL) |
| 529 | return -1; |
| 530 | count = fscanf (fp, "%lu %lu %lu %lu\n", |
| 531 | &load_ave[0], &load_ave[1], &load_ave[2], |
| 532 | &scale); |
| 533 | (void) fclose (fp); |
| 534 | if (count != 4) |
| 535 | return -1; |
| 536 | |
| 537 | for (elem = 0; elem < nelem; elem++) |
| 538 | loadavg[elem] = (double) load_ave[elem] / (double) scale; |
| 539 | |
| 540 | return elem; |
| 541 | |
| 542 | #endif /* __NetBSD__ */ |
| 543 | |
| 544 | #if !defined (LDAV_DONE) && defined (NeXT) |
| 545 | #define LDAV_DONE |
| 546 | /* The NeXT code was adapted from iscreen 3.2. */ |
| 547 | |
| 548 | host_t host; |
| 549 | struct processor_set_basic_info info; |
| 550 | unsigned info_count; |
| 551 | |
| 552 | /* We only know how to get the 1-minute average for this system, |
| 553 | so even if the caller asks for more than 1, we only return 1. */ |
| 554 | |
| 555 | if (!getloadavg_initialized) |
| 556 | { |
| 557 | if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) |
| 558 | getloadavg_initialized = 1; |
| 559 | } |
| 560 | |
| 561 | if (getloadavg_initialized) |
| 562 | { |
| 563 | info_count = PROCESSOR_SET_BASIC_INFO_COUNT; |
| 564 | if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, |
| 565 | (processor_set_info_t) &info, &info_count) |
| 566 | != KERN_SUCCESS) |
| 567 | getloadavg_initialized = 0; |
| 568 | else |
| 569 | { |
| 570 | if (nelem > 0) |
| 571 | loadavg[elem++] = (double) info.load_average / LOAD_SCALE; |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | if (!getloadavg_initialized) |
| 576 | return -1; |
| 577 | #endif /* NeXT */ |
| 578 | |
| 579 | #if !defined (LDAV_DONE) && defined (UMAX) |
| 580 | #define LDAV_DONE |
| 581 | /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not |
| 582 | have a /dev/kmem. Information about the workings of the running kernel |
| 583 | can be gathered with inq_stats system calls. |
| 584 | We only know how to get the 1-minute average for this system. */ |
| 585 | |
| 586 | struct proc_summary proc_sum_data; |
| 587 | struct stat_descr proc_info; |
| 588 | double load; |
| 589 | register unsigned int i, j; |
| 590 | |
| 591 | if (cpus == 0) |
| 592 | { |
| 593 | register unsigned int c, i; |
| 594 | struct cpu_config conf; |
| 595 | struct stat_descr desc; |
| 596 | |
| 597 | desc.sd_next = 0; |
| 598 | desc.sd_subsys = SUBSYS_CPU; |
| 599 | desc.sd_type = CPUTYPE_CONFIG; |
| 600 | desc.sd_addr = (char *) &conf; |
| 601 | desc.sd_size = sizeof conf; |
| 602 | |
| 603 | if (inq_stats (1, &desc)) |
| 604 | return -1; |
| 605 | |
| 606 | c = 0; |
| 607 | for (i = 0; i < conf.config_maxclass; ++i) |
| 608 | { |
| 609 | struct class_stats stats; |
| 610 | bzero ((char *) &stats, sizeof stats); |
| 611 | |
| 612 | desc.sd_type = CPUTYPE_CLASS; |
| 613 | desc.sd_objid = i; |
| 614 | desc.sd_addr = (char *) &stats; |
| 615 | desc.sd_size = sizeof stats; |
| 616 | |
| 617 | if (inq_stats (1, &desc)) |
| 618 | return -1; |
| 619 | |
| 620 | c += stats.class_numcpus; |
| 621 | } |
| 622 | cpus = c; |
| 623 | samples = cpus < 2 ? 3 : (2 * cpus / 3); |
| 624 | } |
| 625 | |
| 626 | proc_info.sd_next = 0; |
| 627 | proc_info.sd_subsys = SUBSYS_PROC; |
| 628 | proc_info.sd_type = PROCTYPE_SUMMARY; |
| 629 | proc_info.sd_addr = (char *) &proc_sum_data; |
| 630 | proc_info.sd_size = sizeof (struct proc_summary); |
| 631 | proc_info.sd_sizeused = 0; |
| 632 | |
| 633 | if (inq_stats (1, &proc_info) != 0) |
| 634 | return -1; |
| 635 | |
| 636 | load = proc_sum_data.ps_nrunnable; |
| 637 | j = 0; |
| 638 | for (i = samples - 1; i > 0; --i) |
| 639 | { |
| 640 | load += proc_sum_data.ps_nrun[j]; |
| 641 | if (j++ == PS_NRUNSIZE) |
| 642 | j = 0; |
| 643 | } |
| 644 | |
| 645 | if (nelem > 0) |
| 646 | loadavg[elem++] = load / samples / cpus; |
| 647 | #endif /* UMAX */ |
| 648 | |
| 649 | #if !defined (LDAV_DONE) && defined (DGUX) |
| 650 | #define LDAV_DONE |
| 651 | /* This call can return -1 for an error, but with good args |
| 652 | it's not supposed to fail. The first argument is for no |
| 653 | apparent reason of type `long int *'. */ |
| 654 | dg_sys_info ((long int *) &load_info, |
| 655 | DG_SYS_INFO_LOAD_INFO_TYPE, |
| 656 | DG_SYS_INFO_LOAD_VERSION_0); |
| 657 | |
| 658 | if (nelem > 0) |
| 659 | loadavg[elem++] = load_info.one_minute; |
| 660 | if (nelem > 1) |
| 661 | loadavg[elem++] = load_info.five_minute; |
| 662 | if (nelem > 2) |
| 663 | loadavg[elem++] = load_info.fifteen_minute; |
| 664 | #endif /* DGUX */ |
| 665 | |
| 666 | #if !defined (LDAV_DONE) && defined (apollo) |
| 667 | #define LDAV_DONE |
| 668 | /* Apollo code from lisch@mentorg.com (Ray Lischner). |
| 669 | |
| 670 | This system call is not documented. The load average is obtained as |
| 671 | three long integers, for the load average over the past minute, |
| 672 | five minutes, and fifteen minutes. Each value is a scaled integer, |
| 673 | with 16 bits of integer part and 16 bits of fraction part. |
| 674 | |
| 675 | I'm not sure which operating system first supported this system call, |
| 676 | but I know that SR10.2 supports it. */ |
| 677 | |
| 678 | extern void proc1_$get_loadav (); |
| 679 | unsigned long load_ave[3]; |
| 680 | |
| 681 | proc1_$get_loadav (load_ave); |
| 682 | |
| 683 | if (nelem > 0) |
| 684 | loadavg[elem++] = load_ave[0] / 65536.0; |
| 685 | if (nelem > 1) |
| 686 | loadavg[elem++] = load_ave[1] / 65536.0; |
| 687 | if (nelem > 2) |
| 688 | loadavg[elem++] = load_ave[2] / 65536.0; |
| 689 | #endif /* apollo */ |
| 690 | |
| 691 | #if !defined (LDAV_DONE) && defined (OSF_MIPS) |
| 692 | #define LDAV_DONE |
| 693 | |
| 694 | struct tbl_loadavg load_ave; |
| 695 | table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); |
| 696 | loadavg[elem++] |
| 697 | = (load_ave.tl_lscale == 0 |
| 698 | ? load_ave.tl_avenrun.d[0] |
| 699 | : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); |
| 700 | #endif /* OSF_MIPS */ |
| 701 | |
| 702 | #if !defined (LDAV_DONE) && defined (VMS) |
| 703 | /* VMS specific code -- read from the Load Ave driver. */ |
| 704 | |
| 705 | LOAD_AVE_TYPE load_ave[3]; |
| 706 | static int getloadavg_initialized = 0; |
| 707 | #ifdef eunice |
| 708 | struct |
| 709 | { |
| 710 | int dsc$w_length; |
| 711 | char *dsc$a_pointer; |
| 712 | } descriptor; |
| 713 | #endif |
| 714 | |
| 715 | /* Ensure that there is a channel open to the load ave device. */ |
| 716 | if (!getloadavg_initialized) |
| 717 | { |
| 718 | /* Attempt to open the channel. */ |
| 719 | #ifdef eunice |
| 720 | descriptor.dsc$w_length = 18; |
| 721 | descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; |
| 722 | #else |
| 723 | $DESCRIPTOR (descriptor, "LAV0:"); |
| 724 | #endif |
| 725 | if (sys$assign (&descriptor, &channel, 0, 0) & 1) |
| 726 | getloadavg_initialized = 1; |
| 727 | } |
| 728 | |
| 729 | /* Read the load average vector. */ |
| 730 | if (getloadavg_initialized |
| 731 | && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, |
| 732 | load_ave, 12, 0, 0, 0, 0) & 1)) |
| 733 | { |
| 734 | sys$dassgn (channel); |
| 735 | getloadavg_initialized = 0; |
| 736 | } |
| 737 | |
| 738 | if (!getloadavg_initialized) |
| 739 | return -1; |
| 740 | #endif /* VMS */ |
| 741 | |
| 742 | #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS) |
| 743 | |
| 744 | /* UNIX-specific code -- read the average from /dev/kmem. */ |
| 745 | |
| 746 | #define LDAV_PRIVILEGED /* This code requires special installation. */ |
| 747 | |
| 748 | LOAD_AVE_TYPE load_ave[3]; |
| 749 | |
| 750 | /* Get the address of LDAV_SYMBOL. */ |
| 751 | if (offset == 0) |
| 752 | { |
| 753 | #ifndef sgi |
| 754 | #ifndef NLIST_STRUCT |
| 755 | strcpy (nl[0].n_name, LDAV_SYMBOL); |
| 756 | strcpy (nl[1].n_name, ""); |
| 757 | #else /* NLIST_STRUCT */ |
| 758 | #ifdef NLIST_NAME_UNION |
| 759 | nl[0].n_un.n_name = LDAV_SYMBOL; |
| 760 | nl[1].n_un.n_name = 0; |
| 761 | #else /* not NLIST_NAME_UNION */ |
| 762 | nl[0].n_name = LDAV_SYMBOL; |
| 763 | nl[1].n_name = 0; |
| 764 | #endif /* not NLIST_NAME_UNION */ |
| 765 | #endif /* NLIST_STRUCT */ |
| 766 | |
| 767 | #ifndef SUNOS_5 |
| 768 | if (nlist (KERNEL_FILE, nl) >= 0) |
| 769 | /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */ |
| 770 | { |
| 771 | #ifdef FIXUP_KERNEL_SYMBOL_ADDR |
| 772 | FIXUP_KERNEL_SYMBOL_ADDR (nl); |
| 773 | #endif |
| 774 | offset = nl[0].n_value; |
| 775 | } |
| 776 | #endif /* !SUNOS_5 */ |
| 777 | #else /* sgi */ |
| 778 | int ldav_off; |
| 779 | |
| 780 | ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); |
| 781 | if (ldav_off != -1) |
| 782 | offset = (long) ldav_off & 0x7fffffff; |
| 783 | #endif /* sgi */ |
| 784 | } |
| 785 | |
| 786 | /* Make sure we have /dev/kmem open. */ |
| 787 | if (!getloadavg_initialized) |
| 788 | { |
| 789 | #ifndef SUNOS_5 |
| 790 | channel = open ("/dev/kmem", 0); |
| 791 | if (channel >= 0) |
| 792 | getloadavg_initialized = 1; |
| 793 | #else /* SUNOS_5 */ |
| 794 | /* We pass 0 for the kernel, corefile, and swapfile names |
| 795 | to use the currently running kernel. */ |
| 796 | kd = kvm_open (0, 0, 0, O_RDONLY, 0); |
| 797 | if (kd != 0) |
| 798 | { |
| 799 | /* nlist the currently running kernel. */ |
| 800 | kvm_nlist (kd, nl); |
| 801 | offset = nl[0].n_value; |
| 802 | getloadavg_initialized = 1; |
| 803 | } |
| 804 | #endif /* SUNOS_5 */ |
| 805 | } |
| 806 | |
| 807 | /* If we can, get the load average values. */ |
| 808 | if (offset && getloadavg_initialized) |
| 809 | { |
| 810 | /* Try to read the load. */ |
| 811 | #ifndef SUNOS_5 |
| 812 | if (lseek (channel, offset, 0) == -1L |
| 813 | || read (channel, (char *) load_ave, sizeof (load_ave)) |
| 814 | != sizeof (load_ave)) |
| 815 | { |
| 816 | close (channel); |
| 817 | getloadavg_initialized = 0; |
| 818 | } |
| 819 | #else /* SUNOS_5 */ |
| 820 | if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) |
| 821 | != sizeof (load_ave)) |
| 822 | { |
| 823 | kvm_close (kd); |
| 824 | getloadavg_initialized = 0; |
| 825 | } |
| 826 | #endif /* SUNOS_5 */ |
| 827 | } |
| 828 | |
| 829 | if (offset == 0 || !getloadavg_initialized) |
| 830 | return -1; |
| 831 | #endif /* LOAD_AVE_TYPE and not VMS */ |
| 832 | |
| 833 | #if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ |
| 834 | if (nelem > 0) |
| 835 | loadavg[elem++] = LDAV_CVT (load_ave[0]); |
| 836 | if (nelem > 1) |
| 837 | loadavg[elem++] = LDAV_CVT (load_ave[1]); |
| 838 | if (nelem > 2) |
| 839 | loadavg[elem++] = LDAV_CVT (load_ave[2]); |
| 840 | |
| 841 | #define LDAV_DONE |
| 842 | #endif /* !LDAV_DONE && LOAD_AVE_TYPE */ |
| 843 | |
| 844 | #ifdef LDAV_DONE |
| 845 | return elem; |
| 846 | #else |
| 847 | /* Set errno to zero to indicate that there was no particular error; |
| 848 | this function just can't work at all on this system. */ |
| 849 | errno = 0; |
| 850 | return -1; |
| 851 | #endif |
| 852 | } |
| 853 | |
| 854 | #endif /* ! HAVE_GETLOADAVG */ |
| 855 | \f |
| 856 | #ifdef TEST |
| 857 | void |
| 858 | main (argc, argv) |
| 859 | int argc; |
| 860 | char **argv; |
| 861 | { |
| 862 | int naptime = 0; |
| 863 | |
| 864 | if (argc > 1) |
| 865 | naptime = atoi (argv[1]); |
| 866 | |
| 867 | while (1) |
| 868 | { |
| 869 | double avg[3]; |
| 870 | int loads; |
| 871 | |
| 872 | errno = 0; /* Don't be misled if it doesn't set errno. */ |
| 873 | loads = getloadavg (avg, 3); |
| 874 | if (loads == -1) |
| 875 | { |
| 876 | perror ("Error getting load average"); |
| 877 | exit (1); |
| 878 | } |
| 879 | if (loads > 0) |
| 880 | printf ("1-minute: %f ", avg[0]); |
| 881 | if (loads > 1) |
| 882 | printf ("5-minute: %f ", avg[1]); |
| 883 | if (loads > 2) |
| 884 | printf ("15-minute: %f ", avg[2]); |
| 885 | if (loads > 0) |
| 886 | putchar ('\n'); |
| 887 | |
| 888 | if (naptime == 0) |
| 889 | break; |
| 890 | sleep (naptime); |
| 891 | } |
| 892 | |
| 893 | exit (0); |
| 894 | } |
| 895 | #endif /* TEST */ |