Mercurial > gnulib
annotate lib/getloadavg.c @ 4704:b7a1b14802c8
Correct cpp indentation.
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Sat, 13 Sep 2003 22:13:36 +0000 |
| parents | c2721dfc9217 |
| children | 6b9af4133e6f |
| rev | line source |
|---|---|
| 584 | 1 /* Get the system load averages. |
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2 |
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3 Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994, |
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4 1995, 1997, 1999, 2000, 2003 Free Software Foundation, Inc. |
| 584 | 5 |
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6 NOTE: The canonical source of this file is maintained with gnulib. |
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7 Bugs can be reported to bug-gnulib@gnu.org. |
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8 |
| 584 | 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 2, or (at your option) | |
| 12 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, write to the Free Software | |
| 21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
| 22 USA. */ | |
| 23 | |
| 24 /* Compile-time symbols that this file uses: | |
| 25 | |
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26 HAVE_PSTAT_GETDYNAMIC Define this if your system has the |
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27 pstat_getdynamic function. I think it |
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28 is unique to HPUX9. The best way to get the |
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29 definition is through the AC_FUNC_GETLOADAVG |
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30 macro that comes with autoconf 2.13 or newer. |
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31 If that isn't an option, then just put |
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32 AC_CHECK_FUNCS(pstat_getdynamic) in your |
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33 configure.in file. |
| 584 | 34 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. |
| 35 KERNEL_FILE Pathname of the kernel 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; | |
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42 or we have libkstat; |
| 584 | 43 otherwise, no load average is available. |
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44 HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults |
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45 to this. |
| 2609 | 46 NLIST_STRUCT Include nlist.h, not a.out.h, and |
| 47 the nlist n_name element is a pointer, | |
| 48 not an array. | |
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49 HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'. |
| 584 | 50 LINUX_LDAV_FILE [__linux__]: File containing load averages. |
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51 HAVE_LOCALE_H locale.h is available. |
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52 HAVE_SETLOCALE The `setlocale' function is available. |
| 584 | 53 |
| 54 Specific system predefines this file uses, aside from setting | |
| 55 default values if not emacs: | |
| 56 | |
| 57 apollo | |
| 58 BSD Real BSD, not just BSD-like. | |
| 59 convex | |
| 60 DGUX | |
| 61 eunice UNIX emulator under VMS. | |
| 62 hpux | |
| 986 | 63 __MSDOS__ No-op for MSDOS. |
| 584 | 64 NeXT |
| 65 sgi | |
| 66 sequent Sequent Dynix 3.x.x (BSD) | |
| 67 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) | |
| 68 sony_news NEWS-OS (works at least for 4.1C) | |
| 69 UMAX | |
| 70 UMAX4_3 | |
| 71 VMS | |
| 986 | 72 WINDOWS32 No-op for Windows95/NT. |
| 584 | 73 __linux__ Linux: assumes /proc filesystem mounted. |
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74 Support from Michael K. Johnson. |
| 584 | 75 __NetBSD__ NetBSD: assumes /kern filesystem 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 /* This should always be first. */ | |
| 84 #ifdef HAVE_CONFIG_H | |
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85 # include <config.h> |
| 584 | 86 #endif |
| 87 | |
| 88 #include <sys/types.h> | |
| 89 | |
| 90 /* Both the Emacs and non-Emacs sections want this. Some | |
| 91 configuration files' definitions for the LOAD_AVE_CVT macro (like | |
| 92 sparc.h's) use macros like FSCALE, defined here. */ | |
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93 #if defined (unix) || defined (__unix) |
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94 # include <sys/param.h> |
| 584 | 95 #endif |
| 96 | |
| 97 | |
| 98 /* Exclude all the code except the test program at the end | |
| 99 if the system has its own `getloadavg' function. | |
| 100 | |
| 101 The declaration of `errno' is needed by the test program | |
| 102 as well as the function itself, so it comes first. */ | |
| 103 | |
| 104 #include <errno.h> | |
| 105 | |
| 106 #ifndef errno | |
| 107 extern int errno; | |
| 108 #endif | |
| 109 | |
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110 #ifdef HAVE_LOCALE_H |
| 1694 | 111 # include <locale.h> |
| 112 #endif | |
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113 #ifndef HAVE_SETLOCALE |
| 1694 | 114 # define setlocale(Category, Locale) /* empty */ |
| 115 #endif | |
| 116 | |
| 584 | 117 #ifndef HAVE_GETLOADAVG |
| 118 | |
| 119 /* The existing Emacs configuration files define a macro called | |
| 120 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and | |
| 121 returns the load average multiplied by 100. What we actually want | |
| 122 is a macro called LDAV_CVT, which returns the load average as an | |
| 123 unmultiplied double. | |
| 124 | |
| 125 For backwards compatibility, we'll define LDAV_CVT in terms of | |
| 126 LOAD_AVE_CVT, but future machine config files should just define | |
| 127 LDAV_CVT directly. */ | |
| 128 | |
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129 # if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT) |
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130 # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) |
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131 # endif |
| 584 | 132 |
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133 # if !defined (BSD) && defined (ultrix) |
| 584 | 134 /* Ultrix behaves like BSD on Vaxen. */ |
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135 # define BSD |
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136 # endif |
| 584 | 137 |
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138 # ifdef NeXT |
| 584 | 139 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which |
| 140 conflicts with the definition understood in this file, that this | |
| 141 really is BSD. */ | |
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142 # undef BSD |
| 584 | 143 |
| 144 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being | |
| 145 defined to mean that the nlist method should be used, which is not true. */ | |
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146 # undef FSCALE |
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147 # endif |
| 584 | 148 |
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149 /* Same issues as for NeXT apply to the HURD-based GNU system. */ |
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150 # ifdef __GNU__ |
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151 # undef BSD |
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152 # undef FSCALE |
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153 # endif /* __GNU__ */ |
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154 |
| 584 | 155 /* Set values that are different from the defaults, which are |
| 156 set a little farther down with #ifndef. */ | |
| 157 | |
| 158 | |
| 159 /* Some shorthands. */ | |
| 160 | |
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161 # if defined (HPUX) && !defined (hpux) |
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162 # define hpux |
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163 # endif |
| 584 | 164 |
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165 # if defined (__hpux) && !defined (hpux) |
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166 # define hpux |
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167 # endif |
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168 |
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169 # if defined (__sun) && !defined (sun) |
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170 # define sun |
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171 # endif |
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172 |
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173 # if defined (hp300) && !defined (hpux) |
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174 # define MORE_BSD |
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175 # endif |
| 584 | 176 |
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177 # if defined (ultrix) && defined (mips) |
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178 # define decstation |
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179 # endif |
| 584 | 180 |
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181 # if defined (__SVR4) && !defined (SVR4) |
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182 # define SVR4 |
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183 # endif |
| 798 | 184 |
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185 # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) |
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186 # define SUNOS_5 |
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187 # endif |
| 584 | 188 |
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189 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) |
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190 # define OSF_ALPHA |
| 986 | 191 # include <sys/mbuf.h> |
| 192 # include <sys/socket.h> | |
| 193 # include <net/route.h> | |
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194 # include <sys/table.h> |
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195 # endif |
| 584 | 196 |
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197 # if defined (__osf__) && (defined (mips) || defined (__mips__)) |
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198 # define OSF_MIPS |
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199 # include <sys/table.h> |
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200 # endif |
| 584 | 201 |
| 202 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by | |
| 203 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine | |
| 204 that with a couple of other things and we'll have a unique match. */ | |
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205 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) |
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206 # define tek4300 /* Define by emacs, but not by other users. */ |
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207 # endif |
| 584 | 208 |
| 209 | |
| 210 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ | |
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211 # ifndef LOAD_AVE_TYPE |
| 584 | 212 |
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213 # ifdef MORE_BSD |
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214 # define LOAD_AVE_TYPE long |
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215 # endif |
| 584 | 216 |
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217 # ifdef sun |
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218 # define LOAD_AVE_TYPE long |
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219 # endif |
| 584 | 220 |
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221 # ifdef decstation |
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222 # define LOAD_AVE_TYPE long |
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223 # endif |
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225 # ifdef _SEQUENT_ |
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226 # define LOAD_AVE_TYPE long |
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227 # endif |
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229 # ifdef sgi |
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230 # define LOAD_AVE_TYPE long |
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231 # endif |
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233 # ifdef SVR4 |
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234 # define LOAD_AVE_TYPE long |
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235 # endif |
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237 # ifdef sony_news |
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238 # define LOAD_AVE_TYPE long |
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239 # endif |
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241 # ifdef sequent |
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242 # define LOAD_AVE_TYPE long |
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243 # endif |
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245 # ifdef OSF_ALPHA |
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246 # define LOAD_AVE_TYPE long |
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247 # endif |
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249 # if defined (ardent) && defined (titan) |
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250 # define LOAD_AVE_TYPE long |
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251 # endif |
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253 # ifdef tek4300 |
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254 # define LOAD_AVE_TYPE long |
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255 # endif |
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257 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ |
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258 # define LOAD_AVE_TYPE long |
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259 # endif |
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261 # ifdef _AIX |
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262 # define LOAD_AVE_TYPE long |
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263 # endif |
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265 # ifdef convex |
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266 # define LOAD_AVE_TYPE double |
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267 # ifndef LDAV_CVT |
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268 # define LDAV_CVT(n) (n) |
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269 # endif |
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270 # endif |
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272 # endif /* No LOAD_AVE_TYPE. */ |
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274 # ifdef OSF_ALPHA |
| 584 | 275 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, |
| 276 according to ghazi@noc.rutgers.edu. */ | |
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277 # undef FSCALE |
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278 # define FSCALE 1024.0 |
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279 # endif |
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281 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ |
| 584 | 282 /* <sys/param.h> defines an incorrect value for FSCALE on an |
| 283 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */ | |
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284 # undef FSCALE |
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285 # define FSCALE 100.0 |
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286 # endif |
| 584 | 287 |
| 288 | |
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289 # ifndef FSCALE |
| 584 | 290 |
| 291 /* SunOS and some others define FSCALE in sys/param.h. */ | |
| 292 | |
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293 # ifdef MORE_BSD |
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294 # define FSCALE 2048.0 |
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295 # endif |
| 584 | 296 |
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297 # if defined (MIPS) || defined (SVR4) || defined (decstation) |
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298 # define FSCALE 256 |
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299 # endif |
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301 # if defined (sgi) || defined (sequent) |
| 584 | 302 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined |
| 303 above under #ifdef MIPS. But we want the sgi value. */ | |
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304 # undef FSCALE |
| 987 | 305 # define FSCALE 1000.0 |
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306 # endif |
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308 # if defined (ardent) && defined (titan) |
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309 # define FSCALE 65536.0 |
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310 # endif |
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312 # ifdef tek4300 |
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313 # define FSCALE 100.0 |
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314 # endif |
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316 # ifdef _AIX |
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317 # define FSCALE 65536.0 |
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318 # endif |
| 584 | 319 |
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320 # endif /* Not FSCALE. */ |
| 584 | 321 |
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322 # if !defined (LDAV_CVT) && defined (FSCALE) |
| 987 | 323 # define LDAV_CVT(n) (((double) (n)) / FSCALE) |
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324 # endif |
| 584 | 325 |
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326 # ifndef NLIST_STRUCT |
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327 # if HAVE_NLIST_H |
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328 # define NLIST_STRUCT |
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329 # endif |
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330 # endif |
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331 |
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332 # if defined (sgi) || (defined (mips) && !defined (BSD)) |
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333 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) |
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334 # endif |
| 584 | 335 |
| 336 | |
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337 # if !defined (KERNEL_FILE) && defined (sequent) |
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338 # define KERNEL_FILE "/dynix" |
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339 # endif |
| 584 | 340 |
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341 # if !defined (KERNEL_FILE) && defined (hpux) |
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342 # define KERNEL_FILE "/hp-ux" |
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343 # endif |
| 584 | 344 |
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345 # if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan))) |
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346 # define KERNEL_FILE "/unix" |
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347 # endif |
| 584 | 348 |
| 349 | |
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350 # if !defined (LDAV_SYMBOL) && defined (alliant) |
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351 # define LDAV_SYMBOL "_Loadavg" |
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352 # endif |
| 584 | 353 |
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354 # if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || defined (_AIX)) |
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355 # define LDAV_SYMBOL "avenrun" |
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356 # endif |
| 584 | 357 |
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358 # ifdef HAVE_UNISTD_H |
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359 # include <unistd.h> |
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360 # endif |
| 584 | 361 |
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362 # include <stdio.h> |
| 584 | 363 |
| 364 /* LOAD_AVE_TYPE should only get defined if we're going to use the | |
| 365 nlist method. */ | |
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366 # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL)) |
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367 # define LOAD_AVE_TYPE double |
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368 # endif |
| 584 | 369 |
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370 # ifdef LOAD_AVE_TYPE |
| 584 | 371 |
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372 # ifndef VMS |
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373 # ifndef __linux__ |
| 2609 | 374 # ifndef NLIST_STRUCT |
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375 # include <a.out.h> |
| 2609 | 376 # else /* NLIST_STRUCT */ |
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377 # include <nlist.h> |
| 2609 | 378 # endif /* NLIST_STRUCT */ |
| 584 | 379 |
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380 # ifdef SUNOS_5 |
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381 # include <fcntl.h> |
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382 # include <kvm.h> |
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383 # include <kstat.h> |
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384 # endif |
| 584 | 385 |
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386 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
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387 # include <sys/pstat.h> |
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388 # endif |
| 584 | 389 |
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390 # ifndef KERNEL_FILE |
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391 # define KERNEL_FILE "/vmunix" |
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392 # endif /* KERNEL_FILE */ |
| 584 | 393 |
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394 # ifndef LDAV_SYMBOL |
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395 # define LDAV_SYMBOL "_avenrun" |
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396 # endif /* LDAV_SYMBOL */ |
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397 # endif /* __linux__ */ |
| 584 | 398 |
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399 # else /* VMS */ |
| 584 | 400 |
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401 # ifndef eunice |
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402 # include <iodef.h> |
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403 # include <descrip.h> |
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404 # else /* eunice */ |
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405 # include <vms/iodef.h> |
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406 # endif /* eunice */ |
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407 # endif /* VMS */ |
| 584 | 408 |
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409 # ifndef LDAV_CVT |
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410 # define LDAV_CVT(n) ((double) (n)) |
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411 # endif /* !LDAV_CVT */ |
| 584 | 412 |
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413 # endif /* LOAD_AVE_TYPE */ |
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414 |
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415 # if defined (__GNU__) && !defined (NeXT) |
| 986 | 416 /* Note that NeXT Openstep defines __GNU__ even though it should not. */ |
| 417 /* GNU system acts much like NeXT, for load average purposes, | |
| 418 but not exactly. */ | |
| 419 # define NeXT | |
| 420 # define host_self mach_host_self | |
| 421 # endif | |
| 422 | |
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423 # ifdef NeXT |
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424 # ifdef HAVE_MACH_MACH_H |
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425 # include <mach/mach.h> |
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426 # else |
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427 # include <mach.h> |
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428 # endif |
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429 # endif /* NeXT */ |
| 584 | 430 |
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431 # ifdef sgi |
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432 # include <sys/sysmp.h> |
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433 # endif /* sgi */ |
| 584 | 434 |
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435 # ifdef UMAX |
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436 # include <stdio.h> |
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437 # include <signal.h> |
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438 # include <sys/time.h> |
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439 # include <sys/wait.h> |
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440 # include <sys/syscall.h> |
| 584 | 441 |
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442 # ifdef UMAX_43 |
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443 # include <machine/cpu.h> |
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444 # include <inq_stats/statistics.h> |
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445 # include <inq_stats/sysstats.h> |
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446 # include <inq_stats/cpustats.h> |
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447 # include <inq_stats/procstats.h> |
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448 # else /* Not UMAX_43. */ |
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449 # include <sys/sysdefs.h> |
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450 # include <sys/statistics.h> |
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451 # include <sys/sysstats.h> |
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452 # include <sys/cpudefs.h> |
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453 # include <sys/cpustats.h> |
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454 # include <sys/procstats.h> |
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455 # endif /* Not UMAX_43. */ |
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456 # endif /* UMAX */ |
| 584 | 457 |
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458 # ifdef DGUX |
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459 # include <sys/dg_sys_info.h> |
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460 # endif |
| 584 | 461 |
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462 # if defined (HAVE_FCNTL_H) || defined (_POSIX_VERSION) |
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463 # include <fcntl.h> |
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464 # else |
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465 # include <sys/file.h> |
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466 # endif |
| 584 | 467 |
| 468 /* Avoid static vars inside a function since in HPUX they dump as pure. */ | |
| 469 | |
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470 # ifdef NeXT |
| 584 | 471 static processor_set_t default_set; |
| 472 static int getloadavg_initialized; | |
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473 # endif /* NeXT */ |
| 584 | 474 |
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475 # ifdef UMAX |
| 584 | 476 static unsigned int cpus = 0; |
| 477 static unsigned int samples; | |
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478 # endif /* UMAX */ |
| 584 | 479 |
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480 # ifdef DGUX |
| 584 | 481 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ |
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482 # endif /* DGUX */ |
| 584 | 483 |
| 4704 | 484 # if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE) |
| 584 | 485 /* File descriptor open to /dev/kmem or VMS load ave driver. */ |
| 486 static int channel; | |
| 487 /* Nonzero iff channel is valid. */ | |
| 488 static int getloadavg_initialized; | |
| 489 /* Offset in kmem to seek to read load average, or 0 means invalid. */ | |
| 490 static long offset; | |
| 491 | |
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492 # if !defined (VMS) && !defined (sgi) && !defined (__linux__) |
| 584 | 493 static struct nlist nl[2]; |
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494 # endif /* Not VMS or sgi */ |
| 584 | 495 |
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496 # ifdef SUNOS_5 |
| 584 | 497 static kvm_t *kd; |
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498 # endif /* SUNOS_5 */ |
| 584 | 499 |
| 4704 | 500 # endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ |
| 584 | 501 |
| 502 /* Put the 1 minute, 5 minute and 15 minute load averages | |
| 503 into the first NELEM elements of LOADAVG. | |
| 504 Return the number written (never more than 3, but may be less than NELEM), | |
| 505 or -1 if an error occurred. */ | |
| 506 | |
| 507 int | |
|
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508 getloadavg (double loadavg[], int nelem) |
| 584 | 509 { |
| 510 int elem = 0; /* Return value. */ | |
| 511 | |
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512 # ifdef NO_GET_LOAD_AVG |
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513 # define LDAV_DONE |
| 584 | 514 /* Set errno to zero to indicate that there was no particular error; |
| 515 this function just can't work at all on this system. */ | |
| 516 errno = 0; | |
| 517 elem = -1; | |
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518 # endif |
| 584 | 519 |
| 986 | 520 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) |
| 694 | 521 /* Use libkstat because we don't have to be root. */ |
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522 # define LDAV_DONE |
| 694 | 523 kstat_ctl_t *kc; |
| 524 kstat_t *ksp; | |
| 525 kstat_named_t *kn; | |
| 526 | |
| 527 kc = kstat_open (); | |
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528 if (kc == 0) |
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529 return -1; |
| 694 | 530 ksp = kstat_lookup (kc, "unix", 0, "system_misc"); |
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531 if (ksp == 0) |
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532 return -1; |
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533 if (kstat_read (kc, ksp, 0) == -1) |
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534 return -1; |
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535 |
| 694 | 536 |
| 537 kn = kstat_data_lookup (ksp, "avenrun_1min"); | |
| 538 if (kn == 0) | |
| 539 { | |
| 540 /* Return -1 if no load average information is available. */ | |
| 541 nelem = 0; | |
| 542 elem = -1; | |
| 543 } | |
| 544 | |
| 545 if (nelem >= 1) | |
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546 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 694 | 547 |
| 548 if (nelem >= 2) | |
| 549 { | |
| 550 kn = kstat_data_lookup (ksp, "avenrun_5min"); | |
| 551 if (kn != 0) | |
| 552 { | |
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553 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 694 | 554 |
| 555 if (nelem >= 3) | |
| 556 { | |
| 557 kn = kstat_data_lookup (ksp, "avenrun_15min"); | |
| 558 if (kn != 0) | |
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559 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 694 | 560 } |
| 561 } | |
| 562 } | |
| 563 | |
| 564 kstat_close (kc); | |
| 986 | 565 # endif /* HAVE_LIBKSTAT */ |
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566 |
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567 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
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568 /* Use pstat_getdynamic() because we don't have to be root. */ |
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569 # define LDAV_DONE |
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570 # undef LOAD_AVE_TYPE |
| 694 | 571 |
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572 struct pst_dynamic dyn_info; |
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573 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0) |
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574 return -1; |
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575 if (nelem > 0) |
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576 loadavg[elem++] = dyn_info.psd_avg_1_min; |
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577 if (nelem > 1) |
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578 loadavg[elem++] = dyn_info.psd_avg_5_min; |
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579 if (nelem > 2) |
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580 loadavg[elem++] = dyn_info.psd_avg_15_min; |
| 584 | 581 |
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582 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ |
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583 |
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584 # if !defined (LDAV_DONE) && defined (__linux__) |
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585 # define LDAV_DONE |
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586 # undef LOAD_AVE_TYPE |
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587 |
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588 # ifndef LINUX_LDAV_FILE |
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589 # define LINUX_LDAV_FILE "/proc/loadavg" |
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590 # endif |
| 584 | 591 |
| 592 char ldavgbuf[40]; | |
| 593 double load_ave[3]; | |
| 594 int fd, count; | |
| 595 | |
| 596 fd = open (LINUX_LDAV_FILE, O_RDONLY); | |
| 597 if (fd == -1) | |
| 598 return -1; | |
| 599 count = read (fd, ldavgbuf, 40); | |
| 600 (void) close (fd); | |
| 601 if (count <= 0) | |
| 602 return -1; | |
| 603 | |
| 1694 | 604 /* The following sscanf must use the C locale. */ |
| 605 setlocale (LC_NUMERIC, "C"); | |
| 584 | 606 count = sscanf (ldavgbuf, "%lf %lf %lf", |
| 607 &load_ave[0], &load_ave[1], &load_ave[2]); | |
| 1694 | 608 setlocale (LC_NUMERIC, ""); |
| 584 | 609 if (count < 1) |
| 610 return -1; | |
| 611 | |
| 612 for (elem = 0; elem < nelem && elem < count; elem++) | |
| 613 loadavg[elem] = load_ave[elem]; | |
| 614 | |
| 615 return elem; | |
| 616 | |
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617 # endif /* __linux__ */ |
| 584 | 618 |
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619 # if !defined (LDAV_DONE) && defined (__NetBSD__) |
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620 # define LDAV_DONE |
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621 # undef LOAD_AVE_TYPE |
| 584 | 622 |
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623 # ifndef NETBSD_LDAV_FILE |
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624 # define NETBSD_LDAV_FILE "/kern/loadavg" |
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625 # endif |
| 584 | 626 |
| 627 unsigned long int load_ave[3], scale; | |
| 628 int count; | |
| 629 FILE *fp; | |
| 630 | |
| 631 fp = fopen (NETBSD_LDAV_FILE, "r"); | |
| 632 if (fp == NULL) | |
| 633 return -1; | |
| 634 count = fscanf (fp, "%lu %lu %lu %lu\n", | |
| 635 &load_ave[0], &load_ave[1], &load_ave[2], | |
| 636 &scale); | |
| 637 (void) fclose (fp); | |
| 638 if (count != 4) | |
| 639 return -1; | |
| 640 | |
| 641 for (elem = 0; elem < nelem; elem++) | |
| 642 loadavg[elem] = (double) load_ave[elem] / (double) scale; | |
| 643 | |
| 644 return elem; | |
| 645 | |
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646 # endif /* __NetBSD__ */ |
| 584 | 647 |
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648 # if !defined (LDAV_DONE) && defined (NeXT) |
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649 # define LDAV_DONE |
| 584 | 650 /* The NeXT code was adapted from iscreen 3.2. */ |
| 651 | |
| 652 host_t host; | |
| 653 struct processor_set_basic_info info; | |
| 654 unsigned info_count; | |
| 655 | |
| 656 /* We only know how to get the 1-minute average for this system, | |
| 657 so even if the caller asks for more than 1, we only return 1. */ | |
| 658 | |
| 659 if (!getloadavg_initialized) | |
| 660 { | |
| 661 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) | |
| 662 getloadavg_initialized = 1; | |
| 663 } | |
| 664 | |
| 665 if (getloadavg_initialized) | |
| 666 { | |
| 667 info_count = PROCESSOR_SET_BASIC_INFO_COUNT; | |
| 668 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, | |
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669 (processor_set_info_t) &info, &info_count) |
| 584 | 670 != KERN_SUCCESS) |
| 671 getloadavg_initialized = 0; | |
| 672 else | |
| 673 { | |
| 674 if (nelem > 0) | |
| 675 loadavg[elem++] = (double) info.load_average / LOAD_SCALE; | |
| 676 } | |
| 677 } | |
| 678 | |
| 679 if (!getloadavg_initialized) | |
| 680 return -1; | |
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681 # endif /* NeXT */ |
| 584 | 682 |
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683 # if !defined (LDAV_DONE) && defined (UMAX) |
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684 # define LDAV_DONE |
| 584 | 685 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not |
| 686 have a /dev/kmem. Information about the workings of the running kernel | |
| 687 can be gathered with inq_stats system calls. | |
| 688 We only know how to get the 1-minute average for this system. */ | |
| 689 | |
| 690 struct proc_summary proc_sum_data; | |
| 691 struct stat_descr proc_info; | |
| 692 double load; | |
| 693 register unsigned int i, j; | |
| 694 | |
| 695 if (cpus == 0) | |
| 696 { | |
| 697 register unsigned int c, i; | |
| 698 struct cpu_config conf; | |
| 699 struct stat_descr desc; | |
| 700 | |
| 701 desc.sd_next = 0; | |
| 702 desc.sd_subsys = SUBSYS_CPU; | |
| 703 desc.sd_type = CPUTYPE_CONFIG; | |
| 704 desc.sd_addr = (char *) &conf; | |
| 705 desc.sd_size = sizeof conf; | |
| 706 | |
| 707 if (inq_stats (1, &desc)) | |
| 708 return -1; | |
| 709 | |
| 710 c = 0; | |
| 711 for (i = 0; i < conf.config_maxclass; ++i) | |
| 712 { | |
| 713 struct class_stats stats; | |
| 714 bzero ((char *) &stats, sizeof stats); | |
| 715 | |
| 716 desc.sd_type = CPUTYPE_CLASS; | |
| 717 desc.sd_objid = i; | |
| 718 desc.sd_addr = (char *) &stats; | |
| 719 desc.sd_size = sizeof stats; | |
| 720 | |
| 721 if (inq_stats (1, &desc)) | |
| 722 return -1; | |
| 723 | |
| 724 c += stats.class_numcpus; | |
| 725 } | |
| 726 cpus = c; | |
| 727 samples = cpus < 2 ? 3 : (2 * cpus / 3); | |
| 728 } | |
| 729 | |
| 730 proc_info.sd_next = 0; | |
| 731 proc_info.sd_subsys = SUBSYS_PROC; | |
| 732 proc_info.sd_type = PROCTYPE_SUMMARY; | |
| 733 proc_info.sd_addr = (char *) &proc_sum_data; | |
| 734 proc_info.sd_size = sizeof (struct proc_summary); | |
| 735 proc_info.sd_sizeused = 0; | |
| 736 | |
| 737 if (inq_stats (1, &proc_info) != 0) | |
| 738 return -1; | |
| 739 | |
| 740 load = proc_sum_data.ps_nrunnable; | |
| 741 j = 0; | |
| 742 for (i = samples - 1; i > 0; --i) | |
| 743 { | |
| 744 load += proc_sum_data.ps_nrun[j]; | |
| 745 if (j++ == PS_NRUNSIZE) | |
| 746 j = 0; | |
| 747 } | |
| 748 | |
| 749 if (nelem > 0) | |
| 750 loadavg[elem++] = load / samples / cpus; | |
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751 # endif /* UMAX */ |
| 584 | 752 |
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753 # if !defined (LDAV_DONE) && defined (DGUX) |
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754 # define LDAV_DONE |
| 584 | 755 /* This call can return -1 for an error, but with good args |
| 756 it's not supposed to fail. The first argument is for no | |
| 757 apparent reason of type `long int *'. */ | |
| 758 dg_sys_info ((long int *) &load_info, | |
| 759 DG_SYS_INFO_LOAD_INFO_TYPE, | |
| 760 DG_SYS_INFO_LOAD_VERSION_0); | |
| 761 | |
| 762 if (nelem > 0) | |
| 763 loadavg[elem++] = load_info.one_minute; | |
| 764 if (nelem > 1) | |
| 765 loadavg[elem++] = load_info.five_minute; | |
| 766 if (nelem > 2) | |
| 767 loadavg[elem++] = load_info.fifteen_minute; | |
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768 # endif /* DGUX */ |
| 584 | 769 |
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770 # if !defined (LDAV_DONE) && defined (apollo) |
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771 # define LDAV_DONE |
| 584 | 772 /* Apollo code from lisch@mentorg.com (Ray Lischner). |
| 773 | |
| 774 This system call is not documented. The load average is obtained as | |
| 775 three long integers, for the load average over the past minute, | |
| 776 five minutes, and fifteen minutes. Each value is a scaled integer, | |
| 777 with 16 bits of integer part and 16 bits of fraction part. | |
| 778 | |
| 779 I'm not sure which operating system first supported this system call, | |
| 780 but I know that SR10.2 supports it. */ | |
| 781 | |
| 782 extern void proc1_$get_loadav (); | |
| 783 unsigned long load_ave[3]; | |
| 784 | |
| 785 proc1_$get_loadav (load_ave); | |
| 786 | |
| 787 if (nelem > 0) | |
| 788 loadavg[elem++] = load_ave[0] / 65536.0; | |
| 789 if (nelem > 1) | |
| 790 loadavg[elem++] = load_ave[1] / 65536.0; | |
| 791 if (nelem > 2) | |
| 792 loadavg[elem++] = load_ave[2] / 65536.0; | |
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793 # endif /* apollo */ |
| 584 | 794 |
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795 # if !defined (LDAV_DONE) && defined (OSF_MIPS) |
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796 # define LDAV_DONE |
| 584 | 797 |
| 798 struct tbl_loadavg load_ave; | |
| 799 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 800 loadavg[elem++] | |
| 801 = (load_ave.tl_lscale == 0 | |
| 802 ? load_ave.tl_avenrun.d[0] | |
| 803 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); | |
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804 # endif /* OSF_MIPS */ |
| 584 | 805 |
| 986 | 806 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) |
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807 # define LDAV_DONE |
| 584 | 808 |
| 809 /* A faithful emulation is going to have to be saved for a rainy day. */ | |
| 694 | 810 for ( ; elem < nelem; elem++) |
| 584 | 811 { |
| 812 loadavg[elem] = 0.0; | |
| 813 } | |
| 986 | 814 # endif /* __MSDOS__ || WINDOWS32 */ |
| 584 | 815 |
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816 # if !defined (LDAV_DONE) && defined (OSF_ALPHA) |
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817 # define LDAV_DONE |
| 584 | 818 |
| 819 struct tbl_loadavg load_ave; | |
| 820 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 821 for (elem = 0; elem < nelem; elem++) | |
| 822 loadavg[elem] | |
| 823 = (load_ave.tl_lscale == 0 | |
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824 ? load_ave.tl_avenrun.d[elem] |
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825 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale)); |
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826 # endif /* OSF_ALPHA */ |
| 584 | 827 |
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828 # if !defined (LDAV_DONE) && defined (VMS) |
| 584 | 829 /* VMS specific code -- read from the Load Ave driver. */ |
| 830 | |
| 831 LOAD_AVE_TYPE load_ave[3]; | |
| 832 static int getloadavg_initialized = 0; | |
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833 # ifdef eunice |
| 584 | 834 struct |
| 835 { | |
| 836 int dsc$w_length; | |
| 837 char *dsc$a_pointer; | |
| 838 } descriptor; | |
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839 # endif |
| 584 | 840 |
| 841 /* Ensure that there is a channel open to the load ave device. */ | |
| 842 if (!getloadavg_initialized) | |
| 843 { | |
| 844 /* Attempt to open the channel. */ | |
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845 # ifdef eunice |
| 584 | 846 descriptor.dsc$w_length = 18; |
| 847 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; | |
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848 # else |
| 584 | 849 $DESCRIPTOR (descriptor, "LAV0:"); |
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850 # endif |
| 584 | 851 if (sys$assign (&descriptor, &channel, 0, 0) & 1) |
| 852 getloadavg_initialized = 1; | |
| 853 } | |
| 854 | |
| 855 /* Read the load average vector. */ | |
| 856 if (getloadavg_initialized | |
| 857 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, | |
| 858 load_ave, 12, 0, 0, 0, 0) & 1)) | |
| 859 { | |
| 860 sys$dassgn (channel); | |
| 861 getloadavg_initialized = 0; | |
| 862 } | |
| 863 | |
| 864 if (!getloadavg_initialized) | |
| 865 return -1; | |
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866 # endif /* VMS */ |
| 584 | 867 |
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868 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) && !defined (VMS) |
| 584 | 869 |
| 870 /* UNIX-specific code -- read the average from /dev/kmem. */ | |
| 871 | |
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872 # define LDAV_PRIVILEGED /* This code requires special installation. */ |
| 584 | 873 |
| 874 LOAD_AVE_TYPE load_ave[3]; | |
| 875 | |
| 876 /* Get the address of LDAV_SYMBOL. */ | |
| 877 if (offset == 0) | |
| 878 { | |
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879 # ifndef sgi |
| 2609 | 880 # ifndef NLIST_STRUCT |
| 584 | 881 strcpy (nl[0].n_name, LDAV_SYMBOL); |
| 882 strcpy (nl[1].n_name, ""); | |
| 2609 | 883 # else /* NLIST_STRUCT */ |
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884 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME |
| 584 | 885 nl[0].n_un.n_name = LDAV_SYMBOL; |
| 886 nl[1].n_un.n_name = 0; | |
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887 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
| 584 | 888 nl[0].n_name = LDAV_SYMBOL; |
| 889 nl[1].n_name = 0; | |
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890 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
| 2609 | 891 # endif /* NLIST_STRUCT */ |
| 584 | 892 |
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893 # ifndef SUNOS_5 |
| 584 | 894 if ( |
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895 # if !(defined (_AIX) && !defined (ps2)) |
| 584 | 896 nlist (KERNEL_FILE, nl) |
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897 # else /* _AIX */ |
| 584 | 898 knlist (nl, 1, sizeof (nl[0])) |
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899 # endif |
| 584 | 900 >= 0) |
| 901 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */ | |
| 902 { | |
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903 # ifdef FIXUP_KERNEL_SYMBOL_ADDR |
| 584 | 904 FIXUP_KERNEL_SYMBOL_ADDR (nl); |
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905 # endif |
| 584 | 906 offset = nl[0].n_value; |
| 907 } | |
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908 # endif /* !SUNOS_5 */ |
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909 # else /* sgi */ |
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910 int ldav_off; |
| 584 | 911 |
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912 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); |
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913 if (ldav_off != -1) |
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914 offset = (long) ldav_off & 0x7fffffff; |
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915 # endif /* sgi */ |
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916 } |
| 584 | 917 |
| 918 /* Make sure we have /dev/kmem open. */ | |
| 919 if (!getloadavg_initialized) | |
| 920 { | |
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921 # ifndef SUNOS_5 |
| 584 | 922 channel = open ("/dev/kmem", 0); |
| 923 if (channel >= 0) | |
| 924 { | |
| 925 /* Set the channel to close on exec, so it does not | |
| 926 litter any child's descriptor table. */ | |
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927 # ifdef F_SETFD |
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928 # ifndef FD_CLOEXEC |
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929 # define FD_CLOEXEC 1 |
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930 # endif |
| 584 | 931 (void) fcntl (channel, F_SETFD, FD_CLOEXEC); |
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932 # endif |
| 584 | 933 getloadavg_initialized = 1; |
| 934 } | |
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935 # else /* SUNOS_5 */ |
| 584 | 936 /* We pass 0 for the kernel, corefile, and swapfile names |
| 937 to use the currently running kernel. */ | |
| 938 kd = kvm_open (0, 0, 0, O_RDONLY, 0); | |
| 694 | 939 if (kd != 0) |
| 584 | 940 { |
| 941 /* nlist the currently running kernel. */ | |
| 942 kvm_nlist (kd, nl); | |
| 943 offset = nl[0].n_value; | |
| 944 getloadavg_initialized = 1; | |
| 945 } | |
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946 # endif /* SUNOS_5 */ |
| 584 | 947 } |
| 948 | |
| 949 /* If we can, get the load average values. */ | |
| 950 if (offset && getloadavg_initialized) | |
| 951 { | |
| 952 /* Try to read the load. */ | |
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953 # ifndef SUNOS_5 |
| 584 | 954 if (lseek (channel, offset, 0) == -1L |
| 955 || read (channel, (char *) load_ave, sizeof (load_ave)) | |
| 956 != sizeof (load_ave)) | |
| 957 { | |
| 958 close (channel); | |
| 959 getloadavg_initialized = 0; | |
| 960 } | |
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961 # else /* SUNOS_5 */ |
| 584 | 962 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) |
| 963 != sizeof (load_ave)) | |
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964 { |
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965 kvm_close (kd); |
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966 getloadavg_initialized = 0; |
| 584 | 967 } |
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968 # endif /* SUNOS_5 */ |
| 584 | 969 } |
| 970 | |
| 971 if (offset == 0 || !getloadavg_initialized) | |
| 972 return -1; | |
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973 # endif /* LOAD_AVE_TYPE and not VMS */ |
| 584 | 974 |
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975 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ |
| 584 | 976 if (nelem > 0) |
| 977 loadavg[elem++] = LDAV_CVT (load_ave[0]); | |
| 978 if (nelem > 1) | |
| 979 loadavg[elem++] = LDAV_CVT (load_ave[1]); | |
| 980 if (nelem > 2) | |
| 981 loadavg[elem++] = LDAV_CVT (load_ave[2]); | |
| 982 | |
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983 # define LDAV_DONE |
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984 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */ |
| 584 | 985 |
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986 # ifdef LDAV_DONE |
| 584 | 987 return elem; |
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988 # else |
| 584 | 989 /* Set errno to zero to indicate that there was no particular error; |
| 990 this function just can't work at all on this system. */ | |
| 991 errno = 0; | |
| 992 return -1; | |
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993 # endif |
| 584 | 994 } |
| 995 | |
| 996 #endif /* ! HAVE_GETLOADAVG */ | |
| 997 | |
| 998 #ifdef TEST | |
| 999 void | |
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1000 main (int argc, char **argv) |
| 584 | 1001 { |
| 1002 int naptime = 0; | |
| 1003 | |
| 1004 if (argc > 1) | |
| 1005 naptime = atoi (argv[1]); | |
| 1006 | |
| 1007 while (1) | |
| 1008 { | |
| 1009 double avg[3]; | |
| 1010 int loads; | |
| 1011 | |
| 1012 errno = 0; /* Don't be misled if it doesn't set errno. */ | |
| 1013 loads = getloadavg (avg, 3); | |
| 1014 if (loads == -1) | |
| 1015 { | |
| 1016 perror ("Error getting load average"); | |
| 1017 exit (1); | |
| 1018 } | |
| 1019 if (loads > 0) | |
| 1020 printf ("1-minute: %f ", avg[0]); | |
| 1021 if (loads > 1) | |
| 1022 printf ("5-minute: %f ", avg[1]); | |
| 1023 if (loads > 2) | |
| 1024 printf ("15-minute: %f ", avg[2]); | |
| 1025 if (loads > 0) | |
| 1026 putchar ('\n'); | |
| 1027 | |
| 1028 if (naptime == 0) | |
| 1029 break; | |
| 1030 sleep (naptime); | |
| 1031 } | |
| 1032 | |
| 1033 exit (0); | |
| 1034 } | |
| 1035 #endif /* TEST */ |