Mercurial > hg > xemacs-beta
annotate src/getloadavg.c @ 5313:5ed261fd2bd9
Unrool a load-time loop at macro expansion time, cl-macs.el
2010-12-29 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (inline-side-effect-free-compiler-macros):
Unroll a loop here at macro-expansion time, so these compiler
macros are compiled. Use #'eql instead of #'eq in a couple of
places for better style.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Wed, 29 Dec 2010 23:43:10 +0000 |
| parents | aa5ed11f473b |
| children | 308d34e9f07d 861f2601a38b |
| rev | line source |
|---|---|
| 428 | 1 /* Get the system load averages. |
| 2 Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995 | |
| 3 Free Software Foundation, Inc. | |
| 4 | |
| 5 This file is part of XEmacs. | |
| 6 | |
| 7 XEmacs is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2, or (at your option) any | |
| 10 later version. | |
| 11 | |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with XEmacs; see the file COPYING. If not, write to | |
| 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 20 Boston, MA 02111-1307, USA. */ | |
| 21 | |
| 22 /* Compile-time symbols that this file uses: | |
| 23 | |
| 24 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. | |
| 25 KERNEL_FILE Pathname of the kernel to nlist. | |
| 26 LDAV_CVT() Scale the load average from the kernel. | |
| 27 Returns a double. | |
| 28 LDAV_SYMBOL Name of kernel symbol giving load average. | |
| 29 LOAD_AVE_TYPE Type of the load average array in the kernel. | |
|
4759
aa5ed11f473b
Remove support for obsolete systems. See xemacs-patches message with ID
Jerry James <james@xemacs.org>
parents:
1315
diff
changeset
|
30 Must be defined; otherwise, no load average |
|
aa5ed11f473b
Remove support for obsolete systems. See xemacs-patches message with ID
Jerry James <james@xemacs.org>
parents:
1315
diff
changeset
|
31 is available. |
| 428 | 32 NLIST_STRUCT Include nlist.h, not a.out.h, and |
| 33 the nlist n_name element is a pointer, | |
| 34 not an array. | |
| 35 LINUX_LDAV_FILE [__linux__]: File containing load averages. | |
| 36 | |
| 37 Specific system predefines this file uses, aside from setting | |
| 38 default values if not emacs: | |
| 39 | |
| 40 BSD Real BSD, not just BSD-like. | |
| 41 hpux | |
| 42 sgi | |
| 442 | 43 WIN32_NATIVE No-op for Windows9x/NT. |
| 44 CYGWIN No-op for Cygwin. | |
| 428 | 45 __linux__ Linux: assumes /proc filesystem mounted. |
| 46 Support from Michael K. Johnson. | |
| 47 __NetBSD__ NetBSD: assumes /kern filesystem mounted. | |
| 48 __OpenBSD__ OpenBSD: ditto. | |
| 49 | |
| 50 In addition, to avoid nesting many #ifdefs, we internally set | |
| 51 LDAV_DONE to indicate that the load average has been computed. | |
| 52 | |
| 53 We also #define LDAV_PRIVILEGED if a program will require | |
| 54 special installation to be able to call getloadavg. */ | |
| 55 | |
| 56 /* This should always be first. */ | |
| 57 #ifdef HAVE_CONFIG_H | |
| 58 #include <config.h> | |
| 59 #endif | |
| 60 | |
| 61 #include "lisp.h" | |
| 62 #include "sysfile.h" /* for encapsulated open, close, read, write */ | |
| 63 | |
| 64 #ifndef HAVE_GETLOADAVG | |
| 65 | |
| 66 /* The existing Emacs configuration files define a macro called | |
| 67 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and | |
| 68 returns the load average multiplied by 100. What we actually want | |
| 69 is a macro called LDAV_CVT, which returns the load average as an | |
| 70 unmultiplied double. | |
| 71 | |
| 72 For backwards compatibility, we'll define LDAV_CVT in terms of | |
| 73 LOAD_AVE_CVT, but future machine config files should just define | |
| 74 LDAV_CVT directly. */ | |
| 75 | |
| 76 #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT) | |
| 77 #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) | |
| 78 #endif | |
| 79 | |
| 80 #if defined (HAVE_KSTAT_H) | |
| 81 #include <kstat.h> | |
| 82 #endif /* HAVE_KSTAT_H */ | |
| 83 | |
| 84 /* Set values that are different from the defaults, which are | |
| 85 set a little farther down with #ifndef. */ | |
| 86 | |
| 87 | |
| 88 /* Some shorthands. */ | |
| 89 | |
| 90 #if defined (HPUX) && !defined (hpux) | |
| 91 #define hpux | |
| 92 #endif | |
| 93 | |
| 94 #if (defined(sun) && defined(SVR4)) || defined (SOLARIS2) | |
| 95 #define SUNOS_5 | |
| 96 #endif | |
| 97 | |
| 98 #if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) | |
| 99 #define OSF_ALPHA | |
| 100 #include <netdb.h> | |
| 101 #include <netinet/in.h> /* Needed for Digital UNIX V3 */ | |
| 102 #include <net/proto_net.h> | |
| 103 #include <sys/table.h> | |
| 104 #endif | |
| 105 | |
| 106 #if defined (__osf__) && (defined (mips) || defined (__mips__)) | |
| 107 #define OSF_MIPS | |
| 108 #include <sys/table.h> | |
| 109 #endif | |
| 110 | |
| 111 | |
| 112 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ | |
| 113 #ifndef LOAD_AVE_TYPE | |
| 114 | |
| 115 #ifdef sun | |
| 116 #define LOAD_AVE_TYPE long | |
| 117 #endif | |
| 118 | |
| 119 #ifdef decstation | |
| 120 #define LOAD_AVE_TYPE long | |
| 121 #endif | |
| 122 | |
| 123 #ifdef sgi | |
| 124 #define LOAD_AVE_TYPE long | |
| 125 #endif | |
| 126 | |
| 127 #ifdef SVR4 | |
| 128 #define LOAD_AVE_TYPE long | |
| 129 #endif | |
| 130 | |
| 131 #ifdef sony_news | |
| 132 #define LOAD_AVE_TYPE long | |
| 133 #endif | |
| 134 | |
| 135 #ifdef OSF_ALPHA | |
| 136 #define LOAD_AVE_TYPE long | |
| 137 #endif | |
| 138 | |
| 139 #if defined (ardent) && defined (titan) | |
| 140 #define LOAD_AVE_TYPE long | |
| 141 #endif | |
| 142 | |
| 143 #ifdef _AIX | |
| 144 #define LOAD_AVE_TYPE long | |
| 145 #endif | |
| 146 | |
| 147 #endif /* No LOAD_AVE_TYPE. */ | |
| 148 | |
| 149 #ifdef OSF_ALPHA | |
| 150 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, | |
| 151 according to ghazi@noc.rutgers.edu. */ | |
| 152 #undef FSCALE | |
| 153 #define FSCALE 1024.0 | |
| 154 #endif | |
| 155 | |
| 156 #ifndef FSCALE | |
| 157 | |
| 158 /* SunOS and some others define FSCALE in sys/param.h. */ | |
| 159 | |
| 160 #if defined(MIPS) || defined(SVR4) || defined(decstation) | |
| 161 #define FSCALE 256 | |
| 162 #endif | |
| 163 | |
|
4759
aa5ed11f473b
Remove support for obsolete systems. See xemacs-patches message with ID
Jerry James <james@xemacs.org>
parents:
1315
diff
changeset
|
164 #if defined (sgi) |
| 428 | 165 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined |
| 166 above under #ifdef MIPS. But we want the sgi value. */ | |
| 167 #undef FSCALE | |
| 168 #define FSCALE 1000.0 | |
| 169 #endif | |
| 170 | |
| 171 #if defined (ardent) && defined (titan) | |
| 172 #define FSCALE 65536.0 | |
| 173 #endif | |
| 174 | |
| 175 #ifdef _AIX | |
| 176 #define FSCALE 65536.0 | |
| 177 #endif | |
| 178 | |
| 179 #endif /* Not FSCALE. */ | |
| 180 | |
| 181 #if !defined (LDAV_CVT) && defined (FSCALE) | |
| 182 #define LDAV_CVT(n) (((double) (n)) / FSCALE) | |
| 183 #endif | |
| 184 | |
| 185 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */ | |
| 186 #ifndef NLIST_STRUCT | |
| 187 | |
| 188 #ifdef sun | |
| 189 #define NLIST_STRUCT | |
| 190 #endif | |
| 191 | |
| 192 #ifdef decstation | |
| 193 #define NLIST_STRUCT | |
| 194 #endif | |
| 195 | |
| 196 #ifdef hpux | |
| 197 #define NLIST_STRUCT | |
| 198 #endif | |
| 199 | |
| 200 #ifdef sgi | |
| 201 #define NLIST_STRUCT | |
| 202 #endif | |
| 203 | |
| 204 #ifdef SVR4 | |
| 205 #define NLIST_STRUCT | |
| 206 #endif | |
| 207 | |
| 208 #ifdef sony_news | |
| 209 #define NLIST_STRUCT | |
| 210 #endif | |
| 211 | |
| 212 #ifdef OSF_ALPHA | |
| 213 #define NLIST_STRUCT | |
| 214 #endif | |
| 215 | |
| 216 #if defined (ardent) && defined (titan) | |
| 217 #define NLIST_STRUCT | |
| 218 #endif | |
| 219 | |
| 220 #ifdef butterfly | |
| 221 #define NLIST_STRUCT | |
| 222 #endif | |
| 223 | |
| 224 #ifdef _AIX | |
| 225 #define NLIST_STRUCT | |
| 226 #endif | |
| 227 | |
| 228 #endif /* defined (NLIST_STRUCT) */ | |
| 229 | |
| 230 | |
| 231 #if defined(sgi) || (defined(mips) && !defined(BSD)) | |
| 232 #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) | |
| 233 #endif | |
| 234 | |
| 235 #if !defined (KERNEL_FILE) && defined (hpux) | |
| 236 #define KERNEL_FILE "/hp-ux" | |
| 237 #endif | |
| 238 | |
|
4759
aa5ed11f473b
Remove support for obsolete systems. See xemacs-patches message with ID
Jerry James <james@xemacs.org>
parents:
1315
diff
changeset
|
239 #if !defined(KERNEL_FILE) && (defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan))) |
| 428 | 240 #define KERNEL_FILE "/unix" |
| 241 #endif | |
| 242 | |
|
4759
aa5ed11f473b
Remove support for obsolete systems. See xemacs-patches message with ID
Jerry James <james@xemacs.org>
parents:
1315
diff
changeset
|
243 #if !defined(LDAV_SYMBOL) && (defined(hpux) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX)) |
| 428 | 244 #define LDAV_SYMBOL "avenrun" |
| 245 #endif | |
| 246 | |
| 247 #ifdef HAVE_UNISTD_H | |
| 248 #include <unistd.h> | |
| 249 #endif | |
| 250 | |
| 251 #include <stdio.h> | |
| 252 | |
| 253 /* LOAD_AVE_TYPE should only get defined if we're going to use the | |
| 254 nlist method. */ | |
| 255 #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) | |
| 256 #define LOAD_AVE_TYPE double | |
| 257 #endif | |
| 258 | |
| 259 #ifdef LOAD_AVE_TYPE | |
| 260 | |
| 261 #ifndef NLIST_STRUCT | |
| 262 #include <a.out.h> | |
| 263 #else /* NLIST_STRUCT */ | |
| 264 #include <nlist.h> | |
| 265 #endif /* NLIST_STRUCT */ | |
| 266 | |
| 267 #ifdef SUNOS_5 | |
| 268 #include <fcntl.h> | |
| 269 #include <kvm.h> | |
| 270 #endif | |
| 271 | |
| 272 #ifndef KERNEL_FILE | |
| 273 #define KERNEL_FILE "/vmunix" | |
| 274 #endif /* KERNEL_FILE */ | |
| 275 | |
| 276 #ifndef LDAV_SYMBOL | |
| 277 #define LDAV_SYMBOL "_avenrun" | |
| 278 #endif /* LDAV_SYMBOL */ | |
| 279 | |
| 280 #ifndef LDAV_CVT | |
| 281 #define LDAV_CVT(n) ((double) (n)) | |
| 282 #endif /* !LDAV_CVT */ | |
| 283 | |
| 284 #endif /* LOAD_AVE_TYPE */ | |
| 285 | |
| 286 #ifdef sgi | |
| 287 #include <sys/sysmp.h> | |
| 288 #endif /* sgi */ | |
| 289 | |
| 290 #if defined (HAVE_SYS_PSTAT_H) | |
| 291 #include <sys/pstat.h> | |
| 292 #endif /* HAVE_SYS_PSTAT_H (on HPUX) */ | |
| 293 | |
| 294 | |
| 295 /* Avoid static vars inside a function since in HPUX they dump as pure. */ | |
| 296 | |
| 297 #ifdef LOAD_AVE_TYPE | |
| 298 /* File descriptor open to /dev/kmem */ | |
| 299 static int channel; | |
| 300 /* Nonzero iff channel is valid. */ | |
| 301 static int getloadavg_initialized; | |
| 302 /* Offset in kmem to seek to read load average, or 0 means invalid. */ | |
| 303 static long offset; | |
| 304 | |
| 305 #ifndef sgi | |
| 306 static struct nlist nl[2]; | |
| 307 #endif /* not sgi */ | |
| 308 | |
| 309 #ifdef SUNOS_5 | |
| 310 static kvm_t *kd; | |
| 311 #endif /* SUNOS_5 */ | |
| 312 | |
| 313 #ifndef countof | |
| 314 # define countof(x) (sizeof (x) / sizeof (*(x))) | |
| 315 #endif | |
| 316 | |
| 317 #endif /* LOAD_AVE_TYPE */ | |
| 318 | |
| 319 /* Put the 1 minute, 5 minute and 15 minute load averages | |
| 320 into the first NELEM elements of LOADAVG. | |
| 321 Return the number written (never more than 3, but may be less than NELEM), | |
| 322 or -1 if an error occurred. */ | |
| 323 | |
| 442 | 324 int getloadavg (double loadavg[], int nelem); |
| 325 | |
| 428 | 326 int |
| 327 getloadavg (double loadavg[], int nelem) | |
| 328 { | |
| 329 int elem = 0; /* Return value. */ | |
| 330 | |
| 331 #ifdef NO_GET_LOAD_AVG | |
| 332 #define LDAV_DONE | |
| 333 /* Set errno to zero to indicate that there was no particular error; | |
| 334 this function just can't work at all on this system. */ | |
| 335 errno = 0; | |
| 336 elem = -2; | |
| 337 #endif /* NO_GET_LOAD_AVG */ | |
| 338 | |
| 339 #if ! defined (LDAV_DONE) && defined (HAVE_KSTAT_H) && defined (HAVE_LIBKSTAT) | |
| 340 #define LDAV_DONE | |
| 341 /* getloadavg is best implemented using kstat (kernel stats), on | |
| 342 systems (like SunOS5) that support it, since you don't need special | |
| 343 privileges to use it. | |
| 344 | |
| 345 Initial implementation courtesy Zlatko Calusic <zcalusic@carnet.hr>. | |
| 346 Integrated to XEmacs by Hrvoje Niksic <hniksic@xemacs.org>. | |
| 347 Additional cleanup by Hrvoje Niksic, based on code published by | |
| 348 Casper Dik <Casper.Dik@Holland.Sun.Com>. */ | |
| 349 kstat_ctl_t *kc; | |
| 350 kstat_t *ksp; | |
| 351 static char *avestrings[] = { "avenrun_1min", | |
| 352 "avenrun_5min", | |
| 353 "avenrun_15min" }; | |
| 354 | |
| 355 if (nelem > countof (avestrings)) | |
| 356 nelem = countof (avestrings); | |
| 357 | |
| 358 kc = kstat_open (); | |
| 359 if (!kc) | |
| 360 return -1; | |
| 361 ksp = kstat_lookup (kc, "unix", 0, "system_misc"); | |
| 362 if (!ksp) | |
| 363 { | |
| 364 kstat_close (kc); | |
| 365 return -1; | |
| 366 } | |
| 367 if (kstat_read (kc, ksp, 0) < 0) | |
| 368 { | |
| 369 kstat_close (kc); | |
| 370 return -1; | |
| 371 } | |
| 372 for (elem = 0; elem < nelem; elem++) | |
| 373 { | |
| 374 kstat_named_t *kn = | |
| 375 (kstat_named_t *) kstat_data_lookup (ksp, avestrings[elem]); | |
| 376 if (!kn) | |
| 377 { | |
| 378 kstat_close (kc); | |
| 379 return -1; | |
| 380 } | |
| 381 loadavg[elem] = (double)kn->value.ul / FSCALE; | |
| 382 } | |
| 383 kstat_close (kc); | |
| 384 #endif /* HAVE_KSTAT_H && HAVE_LIBKSTAT */ | |
| 385 | |
| 386 #if !defined (LDAV_DONE) && defined (HAVE_SYS_PSTAT_H) | |
| 387 #define LDAV_DONE | |
| 388 /* This is totally undocumented, and is not guaranteed to work, but | |
| 389 mayhap it might .... If it does work, it will work only on HP-UX | |
| 390 8.0 or later. -- Darryl Okahata <darrylo@sr.hp.com> */ | |
| 391 #undef LOAD_AVE_TYPE /* Make sure these don't exist. */ | |
| 392 #undef LOAD_AVE_CVT | |
| 393 #undef LDAV_SYMBOL | |
| 394 struct pst_dynamic procinfo; | |
| 395 union pstun statbuf; | |
| 396 | |
| 397 statbuf.pst_dynamic = &procinfo; | |
| 398 if (pstat (PSTAT_DYNAMIC, statbuf, sizeof (struct pst_dynamic), 0, 0) == -1) | |
| 399 return (-1); | |
| 400 loadavg[elem++] = procinfo.psd_avg_1_min; | |
| 401 loadavg[elem++] = procinfo.psd_avg_5_min; | |
| 402 loadavg[elem++] = procinfo.psd_avg_15_min; | |
| 403 #endif /* HPUX */ | |
| 404 | |
| 405 #if !defined (LDAV_DONE) && defined (__linux__) | |
| 406 #define LDAV_DONE | |
| 407 #undef LOAD_AVE_TYPE | |
| 408 | |
| 409 #ifndef LINUX_LDAV_FILE | |
| 410 #define LINUX_LDAV_FILE "/proc/loadavg" | |
| 411 #endif | |
| 412 | |
| 413 char ldavgbuf[40]; | |
| 414 double load_ave[3]; | |
| 415 int fd, count; | |
| 416 | |
| 771 | 417 fd = retry_open (LINUX_LDAV_FILE, O_RDONLY); |
| 428 | 418 if (fd == -1) |
| 419 return -1; | |
| 771 | 420 count = retry_read (fd, ldavgbuf, 40); |
| 421 (void) retry_close (fd); | |
| 428 | 422 if (count <= 0) |
| 423 return -1; | |
| 424 | |
| 425 count = sscanf (ldavgbuf, "%lf %lf %lf", | |
| 426 &load_ave[0], &load_ave[1], &load_ave[2]); | |
| 427 if (count < 1) | |
| 428 return -1; | |
| 429 | |
| 430 for (elem = 0; elem < nelem && elem < count; elem++) | |
| 431 loadavg[elem] = load_ave[elem]; | |
| 432 #endif /* __linux__ */ | |
| 433 | |
| 434 #if !defined (LDAV_DONE) && defined (__NetBSD__) || defined (__OpenBSD__) | |
| 435 #define LDAV_DONE | |
| 436 #undef LOAD_AVE_TYPE | |
| 437 | |
| 438 #ifndef NETBSD_LDAV_FILE | |
| 439 #define NETBSD_LDAV_FILE "/kern/loadavg" | |
| 440 #endif | |
| 441 | |
| 442 unsigned long int load_ave[3], scale; | |
| 443 int count; | |
| 444 FILE *fp; | |
| 445 | |
| 771 | 446 fp = retry_fopen (NETBSD_LDAV_FILE, "r"); |
| 428 | 447 if (fp == NULL) |
| 448 return -1; | |
| 449 count = fscanf (fp, "%lu %lu %lu %lu\n", | |
| 450 &load_ave[0], &load_ave[1], &load_ave[2], | |
| 451 &scale); | |
| 771 | 452 (void) retry_fclose (fp); |
| 428 | 453 if (count != 4) |
| 454 return -1; | |
| 455 | |
| 456 for (elem = 0; elem < nelem; elem++) | |
| 457 loadavg[elem] = (double) load_ave[elem] / (double) scale; | |
| 458 #endif /* __NetBSD__ or __OpenBSD__ */ | |
| 459 | |
| 1315 | 460 #if !defined (LDAV_DONE) && defined (WIN32_ANY) |
| 428 | 461 #define LDAV_DONE |
| 462 | |
| 463 /* A faithful emulation is going to have to be saved for a rainy day. */ | |
| 464 for ( ; elem < nelem; elem++) | |
| 465 { | |
| 466 loadavg[elem] = 0.0; | |
| 467 } | |
| 442 | 468 #endif /* WIN32_NATIVE or CYGWIN */ |
| 428 | 469 |
| 470 #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) | |
| 471 | |
| 472 /* UNIX-specific code -- read the average from /dev/kmem. */ | |
| 473 | |
| 474 #define LDAV_PRIVILEGED /* This code requires special installation. */ | |
| 475 | |
| 476 LOAD_AVE_TYPE load_ave[3]; | |
| 477 | |
| 478 /* Get the address of LDAV_SYMBOL. */ | |
| 479 if (offset == 0) | |
| 480 { | |
| 481 #ifndef sgi | |
| 482 #ifndef NLIST_STRUCT | |
| 483 strcpy (nl[0].n_name, LDAV_SYMBOL); | |
| 484 strcpy (nl[1].n_name, ""); | |
| 485 #else /* NLIST_STRUCT */ | |
| 486 nl[0].n_name = (char *) LDAV_SYMBOL; | |
| 487 nl[1].n_name = 0; | |
| 488 #endif /* NLIST_STRUCT */ | |
| 489 | |
| 490 #ifndef SUNOS_5 | |
| 491 if ( | |
| 492 #if !(defined (_AIX) && !defined (ps2)) | |
| 493 nlist (KERNEL_FILE, nl) | |
| 494 #else /* _AIX */ | |
| 495 knlist (nl, 1, sizeof (nl[0])) | |
| 496 #endif | |
| 497 >= 0) | |
| 498 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */ | |
| 499 { | |
| 500 #ifdef FIXUP_KERNEL_SYMBOL_ADDR | |
| 501 FIXUP_KERNEL_SYMBOL_ADDR (nl); | |
| 502 #endif | |
| 503 offset = nl[0].n_value; | |
| 504 } | |
| 505 #endif /* !SUNOS_5 */ | |
| 506 #else /* sgi */ | |
| 507 int ldav_off; | |
| 508 | |
| 509 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); | |
| 510 if (ldav_off != -1) | |
| 511 offset = (long) ldav_off & 0x7fffffff; | |
| 512 #endif /* sgi */ | |
| 513 } | |
| 514 | |
| 515 /* Make sure we have /dev/kmem open. */ | |
| 516 if (!getloadavg_initialized) | |
| 517 { | |
| 518 #ifndef SUNOS_5 | |
| 771 | 519 channel = retry_open ("/dev/kmem", 0); |
| 428 | 520 if (channel >= 0) |
| 521 { | |
| 522 /* Set the channel to close on exec, so it does not | |
| 523 litter any child's descriptor table. */ | |
| 524 #ifdef FD_SETFD | |
| 525 #ifndef FD_CLOEXEC | |
| 526 #define FD_CLOEXEC 1 | |
| 527 #endif | |
| 528 (void) fcntl (channel, F_SETFD, FD_CLOEXEC); | |
| 529 #endif | |
| 530 getloadavg_initialized = 1; | |
| 531 } | |
| 532 #else /* SUNOS_5 */ | |
| 533 /* We pass 0 for the kernel, corefile, and swapfile names | |
| 534 to use the currently running kernel. */ | |
| 535 kd = kvm_open (0, 0, 0, O_RDONLY, 0); | |
| 536 if (kd != 0) | |
| 537 { | |
| 538 /* nlist the currently running kernel. */ | |
| 539 kvm_nlist (kd, nl); | |
| 540 offset = nl[0].n_value; | |
| 541 getloadavg_initialized = 1; | |
| 542 } | |
| 543 #endif /* SUNOS_5 */ | |
| 544 } | |
| 545 | |
| 546 /* If we can, get the load average values. */ | |
| 547 if (offset && getloadavg_initialized) | |
| 548 { | |
| 549 /* Try to read the load. */ | |
| 550 #ifndef SUNOS_5 | |
| 551 if (lseek (channel, offset, 0) == -1L | |
| 771 | 552 || retry_read (channel, (char *) load_ave, sizeof (load_ave)) |
| 428 | 553 != sizeof (load_ave)) |
| 554 { | |
| 771 | 555 retry_close (channel); |
| 428 | 556 getloadavg_initialized = 0; |
| 557 } | |
| 558 #else /* SUNOS_5 */ | |
| 559 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) | |
| 560 != sizeof (load_ave)) | |
| 561 { | |
| 562 kvm_close (kd); | |
| 563 getloadavg_initialized = 0; | |
| 564 } | |
| 565 #endif /* SUNOS_5 */ | |
| 566 } | |
| 567 | |
| 568 if (offset == 0 || !getloadavg_initialized) | |
| 569 return -1; | |
| 570 | |
| 571 if (nelem > 0) | |
| 572 loadavg[elem++] = LDAV_CVT (load_ave[0]); | |
| 573 if (nelem > 1) | |
| 574 loadavg[elem++] = LDAV_CVT (load_ave[1]); | |
| 575 if (nelem > 2) | |
| 576 loadavg[elem++] = LDAV_CVT (load_ave[2]); | |
| 577 | |
| 578 #define LDAV_DONE | |
| 579 #endif /* !LDAV_DONE && LOAD_AVE_TYPE */ | |
| 580 | |
| 581 return elem; | |
| 582 } | |
| 583 | |
| 584 #endif /* ! HAVE_GETLOADAVG */ | |
| 585 | |
| 586 #ifdef TEST | |
| 587 void | |
| 588 main (int argc, char **argv) | |
| 589 { | |
| 590 int naptime = 0; | |
| 591 | |
| 592 if (argc > 1) | |
| 593 naptime = atoi (argv[1]); | |
| 594 | |
| 595 while (1) | |
| 596 { | |
| 597 double avg[3]; | |
| 598 int loads; | |
| 599 | |
| 600 errno = 0; /* Don't be misled if it doesn't set errno. */ | |
| 601 loads = getloadavg (avg, 3); | |
| 602 if (loads == -1) | |
| 603 { | |
| 604 perror ("Error getting load average"); | |
| 605 exit (1); | |
| 606 } | |
| 607 if (loads > 0) | |
| 608 printf ("1-minute: %f ", avg[0]); | |
| 609 if (loads > 1) | |
| 610 printf ("5-minute: %f ", avg[1]); | |
| 611 if (loads > 2) | |
| 612 printf ("15-minute: %f ", avg[2]); | |
| 613 if (loads > 0) | |
| 614 putchar ('\n'); | |
| 615 | |
| 616 if (naptime == 0) | |
| 617 break; | |
| 618 sleep (naptime); | |
| 619 } | |
| 620 | |
| 621 exit (0); | |
| 622 } | |
| 623 #endif /* TEST */ |