Mercurial > gnulib
annotate lib/getloadavg.c @ 11746:8c54d722e9ae
getloadavg: check whether n_name is a pointer, for QNX 6.4.1
* lib/getloadavg.c (getloadavg): Use the strcpy-into-nlist.n_name
code also if ! defined N_NAME_POINTER.
* m4/getloadavg.m4 (gl_GETLOADAVG): Add a link-test for N_NAME_POINTER.
This is required on QNX 6.4.1, where /usr/include/nlist.h exists,
but the n_name member is a 12-byte array.
| author | Matt Kraai <mkraai@beckman.com> |
|---|---|
| date | Wed, 29 Jul 2009 08:33:59 -0700 |
| parents | 784aa6a7ca43 |
| children | cf04692dac58 |
| 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, 2004, 2005, 2006, 2007, 2008, 2009 Free |
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5 Software Foundation, Inc. |
| 584 | 6 |
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7 NOTE: The canonical source of this file is maintained with gnulib. |
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8 Bugs can be reported to bug-gnulib@gnu.org. |
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9 |
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10 This program is free software: you can redistribute it and/or modify |
| 584 | 11 it under the terms of the GNU General Public License as published by |
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12 the Free Software Foundation; either version 3 of the License, or |
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13 (at your option) any later version. |
| 584 | 14 |
| 15 This program is distributed in the hope that it will be useful, | |
| 16 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 18 GNU General Public License for more details. | |
| 19 | |
| 20 You should have received a copy of the GNU General Public License | |
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21 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 584 | 22 |
| 23 /* Compile-time symbols that this file uses: | |
| 24 | |
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25 HAVE_PSTAT_GETDYNAMIC Define this if your system has the |
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26 pstat_getdynamic function. I think it |
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27 is unique to HPUX9. The best way to get the |
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28 definition is through the AC_FUNC_GETLOADAVG |
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29 macro that comes with autoconf 2.13 or newer. |
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30 If that isn't an option, then just put |
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31 AC_CHECK_FUNCS(pstat_getdynamic) in your |
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32 configure.in file. |
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33 HAVE_LIBPERFSTAT Define this if your system has the |
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34 perfstat_cpu_total function in libperfstat (AIX). |
| 584 | 35 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. |
| 5907 | 36 KERNEL_FILE Name of the kernel file to nlist. |
| 584 | 37 LDAV_CVT() Scale the load average from the kernel. |
| 38 Returns a double. | |
| 39 LDAV_SYMBOL Name of kernel symbol giving load average. | |
| 40 LOAD_AVE_TYPE Type of the load average array in the kernel. | |
| 41 Must be defined unless one of | |
| 42 apollo, DGUX, NeXT, or UMAX is defined; | |
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43 or we have libkstat; |
| 584 | 44 otherwise, no load average is available. |
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45 HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults |
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46 to this. |
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getloadavg: check whether n_name is a pointer, for QNX 6.4.1
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47 NLIST_STRUCT Include nlist.h, not a.out.h. |
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48 NLIST_POINTER The nlist n_name element is a pointer, |
| 2609 | 49 not an array. |
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50 HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'. |
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51 LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing |
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52 load averages. |
| 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. |
| 5159 | 73 __linux__ Linux: assumes /proc file system mounted. |
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74 Support from Michael K. Johnson. |
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75 __CYGWIN__ Cygwin emulates linux /proc/loadavg. |
| 5159 | 76 __NetBSD__ NetBSD: assumes /kern file system mounted. |
| 584 | 77 |
| 78 In addition, to avoid nesting many #ifdefs, we internally set | |
| 79 LDAV_DONE to indicate that the load average has been computed. | |
| 80 | |
| 81 We also #define LDAV_PRIVILEGED if a program will require | |
| 82 special installation to be able to call getloadavg. */ | |
| 83 | |
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84 /* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems |
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85 with partially-configured source directories. */ |
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86 |
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87 #ifndef CONFIGURING_GETLOADAVG |
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88 # include <config.h> |
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89 # include <stdbool.h> |
| 584 | 90 #endif |
| 91 | |
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92 /* Specification. */ |
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93 #include <stdlib.h> |
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94 |
| 5159 | 95 #include <errno.h> |
| 96 #include <stdio.h> | |
| 97 | |
| 98 /* Exclude all the code except the test program at the end | |
| 99 if the system has its own `getloadavg' function. */ | |
| 100 | |
| 101 #ifndef HAVE_GETLOADAVG | |
| 102 | |
| 103 # include <sys/types.h> | |
| 584 | 104 |
| 105 /* Both the Emacs and non-Emacs sections want this. Some | |
| 106 configuration files' definitions for the LOAD_AVE_CVT macro (like | |
| 107 sparc.h's) use macros like FSCALE, defined here. */ | |
| 5159 | 108 # if defined (unix) || defined (__unix) |
| 109 # include <sys/param.h> | |
| 110 # endif | |
| 584 | 111 |
| 5159 | 112 # include "c-strtod.h" |
| 113 # include "cloexec.h" | |
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114 # include "intprops.h" |
| 5159 | 115 # include "xalloc.h" |
| 584 | 116 |
| 117 /* The existing Emacs configuration files define a macro called | |
| 118 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and | |
| 119 returns the load average multiplied by 100. What we actually want | |
| 120 is a macro called LDAV_CVT, which returns the load average as an | |
| 121 unmultiplied double. | |
| 122 | |
| 123 For backwards compatibility, we'll define LDAV_CVT in terms of | |
| 124 LOAD_AVE_CVT, but future machine config files should just define | |
| 125 LDAV_CVT directly. */ | |
| 126 | |
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127 # if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT) |
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128 # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) |
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129 # endif |
| 584 | 130 |
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131 # if !defined (BSD) && defined (ultrix) |
| 584 | 132 /* Ultrix behaves like BSD on Vaxen. */ |
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133 # define BSD |
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134 # endif |
| 584 | 135 |
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136 # ifdef NeXT |
| 584 | 137 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which |
| 138 conflicts with the definition understood in this file, that this | |
| 139 really is BSD. */ | |
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140 # undef BSD |
| 584 | 141 |
| 142 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being | |
| 143 defined to mean that the nlist method should be used, which is not true. */ | |
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144 # undef FSCALE |
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145 # endif |
| 584 | 146 |
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147 /* Same issues as for NeXT apply to the HURD-based GNU system. */ |
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148 # ifdef __GNU__ |
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149 # undef BSD |
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150 # undef FSCALE |
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151 # endif /* __GNU__ */ |
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152 |
| 584 | 153 /* Set values that are different from the defaults, which are |
| 154 set a little farther down with #ifndef. */ | |
| 155 | |
| 156 | |
| 157 /* Some shorthands. */ | |
| 158 | |
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159 # if defined (HPUX) && !defined (hpux) |
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160 # define hpux |
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161 # endif |
| 584 | 162 |
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163 # if defined (__hpux) && !defined (hpux) |
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164 # define hpux |
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165 # endif |
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166 |
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167 # if defined (__sun) && !defined (sun) |
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168 # define sun |
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169 # endif |
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170 |
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171 # if defined (hp300) && !defined (hpux) |
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172 # define MORE_BSD |
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173 # endif |
| 584 | 174 |
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175 # if defined (ultrix) && defined (mips) |
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176 # define decstation |
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177 # endif |
| 584 | 178 |
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179 # if defined (__SVR4) && !defined (SVR4) |
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180 # define SVR4 |
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181 # endif |
| 798 | 182 |
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183 # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) |
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184 # define SUNOS_5 |
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185 # endif |
| 584 | 186 |
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187 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) |
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188 # define OSF_ALPHA |
| 986 | 189 # include <sys/mbuf.h> |
| 190 # include <sys/socket.h> | |
| 191 # include <net/route.h> | |
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192 # include <sys/table.h> |
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193 /* Tru64 4.0D's table.h redefines sys */ |
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194 # undef sys |
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195 # endif |
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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 |
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217 # ifdef sun |
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218 # define LOAD_AVE_TYPE long |
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219 # endif |
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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 |
| 584 | 260 |
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261 # if defined _AIX && ! defined HAVE_LIBPERFSTAT |
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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. */ |
| 584 | 273 |
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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 |
| 584 | 311 |
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312 # ifdef tek4300 |
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313 # define FSCALE 100.0 |
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314 # endif |
| 584 | 315 |
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316 # if defined _AIX && !defined HAVE_LIBPERFSTAT |
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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 |
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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 |
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| 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) && !defined(HAVE_LIBPERFSTAT))) |
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355 # define LDAV_SYMBOL "avenrun" |
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356 # endif |
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358 # include <unistd.h> |
| 584 | 359 |
| 360 /* LOAD_AVE_TYPE should only get defined if we're going to use the | |
| 361 nlist method. */ | |
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362 # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL)) |
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363 # define LOAD_AVE_TYPE double |
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364 # endif |
| 584 | 365 |
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366 # ifdef LOAD_AVE_TYPE |
| 584 | 367 |
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368 # ifndef __VMS |
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369 # ifndef __linux__ |
| 2609 | 370 # ifndef NLIST_STRUCT |
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371 # include <a.out.h> |
| 2609 | 372 # else /* NLIST_STRUCT */ |
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373 # include <nlist.h> |
| 2609 | 374 # endif /* NLIST_STRUCT */ |
| 584 | 375 |
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376 # ifdef SUNOS_5 |
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377 # include <fcntl.h> |
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378 # include <kvm.h> |
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379 # include <kstat.h> |
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380 # endif |
| 584 | 381 |
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382 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
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383 # include <sys/pstat.h> |
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384 # endif |
| 584 | 385 |
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386 # ifndef KERNEL_FILE |
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387 # define KERNEL_FILE "/vmunix" |
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388 # endif /* KERNEL_FILE */ |
| 584 | 389 |
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390 # ifndef LDAV_SYMBOL |
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391 # define LDAV_SYMBOL "_avenrun" |
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392 # endif /* LDAV_SYMBOL */ |
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393 # endif /* __linux__ */ |
| 584 | 394 |
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395 # else /* __VMS */ |
| 584 | 396 |
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397 # ifndef eunice |
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398 # include <iodef.h> |
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399 # include <descrip.h> |
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400 # else /* eunice */ |
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401 # include <vms/iodef.h> |
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402 # endif /* eunice */ |
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403 # endif /* __VMS */ |
| 584 | 404 |
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405 # ifndef LDAV_CVT |
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406 # define LDAV_CVT(n) ((double) (n)) |
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407 # endif /* !LDAV_CVT */ |
| 584 | 408 |
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409 # endif /* LOAD_AVE_TYPE */ |
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410 |
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411 # if defined HAVE_LIBPERFSTAT |
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412 # include <sys/protosw.h> |
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413 # include <libperfstat.h> |
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414 # include <sys/proc.h> |
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415 # ifndef SBITS |
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416 # define SBITS 16 |
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417 # endif |
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418 # endif |
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419 |
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420 # if defined (__GNU__) && !defined (NeXT) |
| 986 | 421 /* Note that NeXT Openstep defines __GNU__ even though it should not. */ |
| 422 /* GNU system acts much like NeXT, for load average purposes, | |
| 423 but not exactly. */ | |
| 424 # define NeXT | |
| 425 # define host_self mach_host_self | |
| 426 # endif | |
| 427 | |
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428 # ifdef NeXT |
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429 # ifdef HAVE_MACH_MACH_H |
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430 # include <mach/mach.h> |
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431 # else |
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432 # include <mach.h> |
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433 # endif |
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434 # endif /* NeXT */ |
| 584 | 435 |
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436 # ifdef sgi |
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437 # include <sys/sysmp.h> |
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438 # endif /* sgi */ |
| 584 | 439 |
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440 # ifdef UMAX |
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441 # include <signal.h> |
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442 # include <sys/time.h> |
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443 # include <sys/wait.h> |
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444 # include <sys/syscall.h> |
| 584 | 445 |
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446 # ifdef UMAX_43 |
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447 # include <machine/cpu.h> |
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448 # include <inq_stats/statistics.h> |
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449 # include <inq_stats/sysstats.h> |
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450 # include <inq_stats/cpustats.h> |
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451 # include <inq_stats/procstats.h> |
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452 # else /* Not UMAX_43. */ |
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453 # include <sys/sysdefs.h> |
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454 # include <sys/statistics.h> |
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455 # include <sys/sysstats.h> |
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456 # include <sys/cpudefs.h> |
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457 # include <sys/cpustats.h> |
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458 # include <sys/procstats.h> |
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459 # endif /* Not UMAX_43. */ |
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460 # endif /* UMAX */ |
| 584 | 461 |
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462 # ifdef DGUX |
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463 # include <sys/dg_sys_info.h> |
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464 # endif |
| 584 | 465 |
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466 # include "fcntl--.h" |
| 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; |
| 5159 | 472 static bool 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; | |
| 5159 | 487 /* True iff channel is valid. */ |
| 488 static bool getloadavg_initialized; | |
| 584 | 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 |
| 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 HAVE_LIBPERFSTAT |
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585 # define LDAV_DONE |
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586 # undef LOAD_AVE_TYPE |
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587 /* Use perfstat_cpu_total because we don't have to be root. */ |
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588 { |
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589 perfstat_cpu_total_t cpu_stats; |
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590 int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1); |
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591 if (result == -1) |
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592 return result; |
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593 loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS); |
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594 loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS); |
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595 loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS); |
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596 elem = 3; |
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597 } |
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598 # endif |
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599 |
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600 # if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) |
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601 # define LDAV_DONE |
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602 # undef LOAD_AVE_TYPE |
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603 |
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604 # ifndef LINUX_LDAV_FILE |
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605 # define LINUX_LDAV_FILE "/proc/loadavg" |
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606 # endif |
| 584 | 607 |
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608 char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")]; |
| 5159 | 609 char const *ptr = ldavgbuf; |
| 584 | 610 int fd, count; |
| 611 | |
| 612 fd = open (LINUX_LDAV_FILE, O_RDONLY); | |
| 613 if (fd == -1) | |
| 614 return -1; | |
| 5159 | 615 count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); |
| 584 | 616 (void) close (fd); |
| 617 if (count <= 0) | |
| 618 return -1; | |
| 5159 | 619 ldavgbuf[count] = '\0'; |
| 584 | 620 |
| 5159 | 621 for (elem = 0; elem < nelem; elem++) |
| 622 { | |
| 623 char *endptr; | |
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624 double d; |
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625 |
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626 errno = 0; |
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627 d = c_strtod (ptr, &endptr); |
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628 if (ptr == endptr || (d == 0 && errno != 0)) |
| 5159 | 629 { |
| 630 if (elem == 0) | |
| 631 return -1; | |
| 632 break; | |
| 633 } | |
| 634 loadavg[elem] = d; | |
| 635 ptr = endptr; | |
| 636 } | |
| 584 | 637 |
| 638 return elem; | |
| 639 | |
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640 # endif /* __linux__ || __CYGWIN__ */ |
| 584 | 641 |
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642 # if !defined (LDAV_DONE) && defined (__NetBSD__) |
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643 # define LDAV_DONE |
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644 # undef LOAD_AVE_TYPE |
| 584 | 645 |
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646 # ifndef NETBSD_LDAV_FILE |
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647 # define NETBSD_LDAV_FILE "/kern/loadavg" |
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648 # endif |
| 584 | 649 |
| 650 unsigned long int load_ave[3], scale; | |
| 651 int count; | |
| 652 FILE *fp; | |
| 653 | |
| 654 fp = fopen (NETBSD_LDAV_FILE, "r"); | |
| 655 if (fp == NULL) | |
| 656 return -1; | |
| 657 count = fscanf (fp, "%lu %lu %lu %lu\n", | |
| 658 &load_ave[0], &load_ave[1], &load_ave[2], | |
| 659 &scale); | |
| 660 (void) fclose (fp); | |
| 661 if (count != 4) | |
| 662 return -1; | |
| 663 | |
| 664 for (elem = 0; elem < nelem; elem++) | |
| 665 loadavg[elem] = (double) load_ave[elem] / (double) scale; | |
| 666 | |
| 667 return elem; | |
| 668 | |
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669 # endif /* __NetBSD__ */ |
| 584 | 670 |
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671 # if !defined (LDAV_DONE) && defined (NeXT) |
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672 # define LDAV_DONE |
| 584 | 673 /* The NeXT code was adapted from iscreen 3.2. */ |
| 674 | |
| 675 host_t host; | |
| 676 struct processor_set_basic_info info; | |
| 5159 | 677 unsigned int info_count; |
| 584 | 678 |
| 679 /* We only know how to get the 1-minute average for this system, | |
| 680 so even if the caller asks for more than 1, we only return 1. */ | |
| 681 | |
| 682 if (!getloadavg_initialized) | |
| 683 { | |
| 684 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) | |
| 5159 | 685 getloadavg_initialized = true; |
| 584 | 686 } |
| 687 | |
| 688 if (getloadavg_initialized) | |
| 689 { | |
| 690 info_count = PROCESSOR_SET_BASIC_INFO_COUNT; | |
| 691 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, | |
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692 (processor_set_info_t) &info, &info_count) |
| 584 | 693 != KERN_SUCCESS) |
| 5159 | 694 getloadavg_initialized = false; |
| 584 | 695 else |
| 696 { | |
| 697 if (nelem > 0) | |
| 698 loadavg[elem++] = (double) info.load_average / LOAD_SCALE; | |
| 699 } | |
| 700 } | |
| 701 | |
| 702 if (!getloadavg_initialized) | |
| 703 return -1; | |
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704 # endif /* NeXT */ |
| 584 | 705 |
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706 # if !defined (LDAV_DONE) && defined (UMAX) |
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707 # define LDAV_DONE |
| 584 | 708 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not |
| 709 have a /dev/kmem. Information about the workings of the running kernel | |
| 710 can be gathered with inq_stats system calls. | |
| 711 We only know how to get the 1-minute average for this system. */ | |
| 712 | |
| 713 struct proc_summary proc_sum_data; | |
| 714 struct stat_descr proc_info; | |
| 715 double load; | |
| 716 register unsigned int i, j; | |
| 717 | |
| 718 if (cpus == 0) | |
| 719 { | |
| 720 register unsigned int c, i; | |
| 721 struct cpu_config conf; | |
| 722 struct stat_descr desc; | |
| 723 | |
| 724 desc.sd_next = 0; | |
| 725 desc.sd_subsys = SUBSYS_CPU; | |
| 726 desc.sd_type = CPUTYPE_CONFIG; | |
| 727 desc.sd_addr = (char *) &conf; | |
| 728 desc.sd_size = sizeof conf; | |
| 729 | |
| 730 if (inq_stats (1, &desc)) | |
| 731 return -1; | |
| 732 | |
| 733 c = 0; | |
| 734 for (i = 0; i < conf.config_maxclass; ++i) | |
| 735 { | |
| 736 struct class_stats stats; | |
| 737 bzero ((char *) &stats, sizeof stats); | |
| 738 | |
| 739 desc.sd_type = CPUTYPE_CLASS; | |
| 740 desc.sd_objid = i; | |
| 741 desc.sd_addr = (char *) &stats; | |
| 742 desc.sd_size = sizeof stats; | |
| 743 | |
| 744 if (inq_stats (1, &desc)) | |
| 745 return -1; | |
| 746 | |
| 747 c += stats.class_numcpus; | |
| 748 } | |
| 749 cpus = c; | |
| 750 samples = cpus < 2 ? 3 : (2 * cpus / 3); | |
| 751 } | |
| 752 | |
| 753 proc_info.sd_next = 0; | |
| 754 proc_info.sd_subsys = SUBSYS_PROC; | |
| 755 proc_info.sd_type = PROCTYPE_SUMMARY; | |
| 756 proc_info.sd_addr = (char *) &proc_sum_data; | |
| 757 proc_info.sd_size = sizeof (struct proc_summary); | |
| 758 proc_info.sd_sizeused = 0; | |
| 759 | |
| 760 if (inq_stats (1, &proc_info) != 0) | |
| 761 return -1; | |
| 762 | |
| 763 load = proc_sum_data.ps_nrunnable; | |
| 764 j = 0; | |
| 765 for (i = samples - 1; i > 0; --i) | |
| 766 { | |
| 767 load += proc_sum_data.ps_nrun[j]; | |
| 768 if (j++ == PS_NRUNSIZE) | |
| 769 j = 0; | |
| 770 } | |
| 771 | |
| 772 if (nelem > 0) | |
| 773 loadavg[elem++] = load / samples / cpus; | |
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774 # endif /* UMAX */ |
| 584 | 775 |
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776 # if !defined (LDAV_DONE) && defined (DGUX) |
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777 # define LDAV_DONE |
| 584 | 778 /* This call can return -1 for an error, but with good args |
| 779 it's not supposed to fail. The first argument is for no | |
| 780 apparent reason of type `long int *'. */ | |
| 781 dg_sys_info ((long int *) &load_info, | |
| 782 DG_SYS_INFO_LOAD_INFO_TYPE, | |
| 783 DG_SYS_INFO_LOAD_VERSION_0); | |
| 784 | |
| 785 if (nelem > 0) | |
| 786 loadavg[elem++] = load_info.one_minute; | |
| 787 if (nelem > 1) | |
| 788 loadavg[elem++] = load_info.five_minute; | |
| 789 if (nelem > 2) | |
| 790 loadavg[elem++] = load_info.fifteen_minute; | |
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791 # endif /* DGUX */ |
| 584 | 792 |
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793 # if !defined (LDAV_DONE) && defined (apollo) |
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794 # define LDAV_DONE |
| 584 | 795 /* Apollo code from lisch@mentorg.com (Ray Lischner). |
| 796 | |
| 797 This system call is not documented. The load average is obtained as | |
| 798 three long integers, for the load average over the past minute, | |
| 799 five minutes, and fifteen minutes. Each value is a scaled integer, | |
| 800 with 16 bits of integer part and 16 bits of fraction part. | |
| 801 | |
| 802 I'm not sure which operating system first supported this system call, | |
| 803 but I know that SR10.2 supports it. */ | |
| 804 | |
| 805 extern void proc1_$get_loadav (); | |
| 806 unsigned long load_ave[3]; | |
| 807 | |
| 808 proc1_$get_loadav (load_ave); | |
| 809 | |
| 810 if (nelem > 0) | |
| 811 loadavg[elem++] = load_ave[0] / 65536.0; | |
| 812 if (nelem > 1) | |
| 813 loadavg[elem++] = load_ave[1] / 65536.0; | |
| 814 if (nelem > 2) | |
| 815 loadavg[elem++] = load_ave[2] / 65536.0; | |
|
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816 # endif /* apollo */ |
| 584 | 817 |
|
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818 # if !defined (LDAV_DONE) && defined (OSF_MIPS) |
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819 # define LDAV_DONE |
| 584 | 820 |
| 821 struct tbl_loadavg load_ave; | |
| 822 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 823 loadavg[elem++] | |
| 824 = (load_ave.tl_lscale == 0 | |
| 825 ? load_ave.tl_avenrun.d[0] | |
| 826 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); | |
|
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827 # endif /* OSF_MIPS */ |
| 584 | 828 |
| 986 | 829 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) |
|
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830 # define LDAV_DONE |
| 584 | 831 |
| 832 /* A faithful emulation is going to have to be saved for a rainy day. */ | |
| 694 | 833 for ( ; elem < nelem; elem++) |
| 584 | 834 { |
| 835 loadavg[elem] = 0.0; | |
| 836 } | |
| 986 | 837 # endif /* __MSDOS__ || WINDOWS32 */ |
| 584 | 838 |
|
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839 # if !defined (LDAV_DONE) && defined (OSF_ALPHA) |
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840 # define LDAV_DONE |
| 584 | 841 |
| 842 struct tbl_loadavg load_ave; | |
| 843 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 844 for (elem = 0; elem < nelem; elem++) | |
| 845 loadavg[elem] | |
| 846 = (load_ave.tl_lscale == 0 | |
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847 ? load_ave.tl_avenrun.d[elem] |
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848 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale)); |
|
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849 # endif /* OSF_ALPHA */ |
| 584 | 850 |
|
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851 # if ! defined LDAV_DONE && defined __VMS |
| 584 | 852 /* VMS specific code -- read from the Load Ave driver. */ |
| 853 | |
| 854 LOAD_AVE_TYPE load_ave[3]; | |
| 5159 | 855 static bool getloadavg_initialized; |
|
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856 # ifdef eunice |
| 584 | 857 struct |
| 858 { | |
| 859 int dsc$w_length; | |
| 860 char *dsc$a_pointer; | |
| 861 } descriptor; | |
|
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862 # endif |
| 584 | 863 |
| 864 /* Ensure that there is a channel open to the load ave device. */ | |
| 865 if (!getloadavg_initialized) | |
| 866 { | |
| 867 /* Attempt to open the channel. */ | |
|
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868 # ifdef eunice |
| 584 | 869 descriptor.dsc$w_length = 18; |
| 870 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; | |
|
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871 # else |
| 584 | 872 $DESCRIPTOR (descriptor, "LAV0:"); |
|
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873 # endif |
| 584 | 874 if (sys$assign (&descriptor, &channel, 0, 0) & 1) |
| 5159 | 875 getloadavg_initialized = true; |
| 584 | 876 } |
| 877 | |
| 878 /* Read the load average vector. */ | |
| 879 if (getloadavg_initialized | |
| 880 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, | |
| 881 load_ave, 12, 0, 0, 0, 0) & 1)) | |
| 882 { | |
| 883 sys$dassgn (channel); | |
| 5159 | 884 getloadavg_initialized = false; |
| 584 | 885 } |
| 886 | |
| 887 if (!getloadavg_initialized) | |
| 888 return -1; | |
|
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889 # endif /* ! defined LDAV_DONE && defined __VMS */ |
| 584 | 890 |
|
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891 # if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS |
| 584 | 892 |
| 893 /* UNIX-specific code -- read the average from /dev/kmem. */ | |
| 894 | |
|
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895 # define LDAV_PRIVILEGED /* This code requires special installation. */ |
| 584 | 896 |
| 897 LOAD_AVE_TYPE load_ave[3]; | |
| 898 | |
| 899 /* Get the address of LDAV_SYMBOL. */ | |
| 900 if (offset == 0) | |
| 901 { | |
|
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902 # ifndef sgi |
|
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903 # if ! defined NLIST_STRUCT || ! defined N_NAME_POINTER |
| 584 | 904 strcpy (nl[0].n_name, LDAV_SYMBOL); |
| 905 strcpy (nl[1].n_name, ""); | |
| 2609 | 906 # else /* NLIST_STRUCT */ |
|
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907 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME |
| 584 | 908 nl[0].n_un.n_name = LDAV_SYMBOL; |
| 909 nl[1].n_un.n_name = 0; | |
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910 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
| 584 | 911 nl[0].n_name = LDAV_SYMBOL; |
| 912 nl[1].n_name = 0; | |
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913 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
| 2609 | 914 # endif /* NLIST_STRUCT */ |
| 584 | 915 |
|
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916 # ifndef SUNOS_5 |
| 584 | 917 if ( |
|
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918 # if !(defined (_AIX) && !defined (ps2)) |
| 584 | 919 nlist (KERNEL_FILE, nl) |
|
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920 # else /* _AIX */ |
| 584 | 921 knlist (nl, 1, sizeof (nl[0])) |
|
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922 # endif |
| 584 | 923 >= 0) |
| 924 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */ | |
| 925 { | |
|
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926 # ifdef FIXUP_KERNEL_SYMBOL_ADDR |
| 584 | 927 FIXUP_KERNEL_SYMBOL_ADDR (nl); |
|
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928 # endif |
| 584 | 929 offset = nl[0].n_value; |
| 930 } | |
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931 # endif /* !SUNOS_5 */ |
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932 # else /* sgi */ |
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933 int ldav_off; |
| 584 | 934 |
|
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935 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); |
|
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936 if (ldav_off != -1) |
| 5159 | 937 offset = (long int) ldav_off & 0x7fffffff; |
|
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938 # endif /* sgi */ |
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939 } |
| 584 | 940 |
| 941 /* Make sure we have /dev/kmem open. */ | |
| 942 if (!getloadavg_initialized) | |
| 943 { | |
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944 # ifndef SUNOS_5 |
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945 channel = open ("/dev/kmem", O_RDONLY); |
| 584 | 946 if (channel >= 0) |
| 947 { | |
| 948 /* Set the channel to close on exec, so it does not | |
| 949 litter any child's descriptor table. */ | |
|
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950 set_cloexec_flag (channel, true); |
| 5159 | 951 getloadavg_initialized = true; |
| 584 | 952 } |
|
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953 # else /* SUNOS_5 */ |
| 584 | 954 /* We pass 0 for the kernel, corefile, and swapfile names |
| 955 to use the currently running kernel. */ | |
| 956 kd = kvm_open (0, 0, 0, O_RDONLY, 0); | |
| 694 | 957 if (kd != 0) |
| 584 | 958 { |
| 959 /* nlist the currently running kernel. */ | |
| 960 kvm_nlist (kd, nl); | |
| 961 offset = nl[0].n_value; | |
| 5159 | 962 getloadavg_initialized = true; |
| 584 | 963 } |
|
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964 # endif /* SUNOS_5 */ |
| 584 | 965 } |
| 966 | |
| 967 /* If we can, get the load average values. */ | |
| 968 if (offset && getloadavg_initialized) | |
| 969 { | |
| 970 /* Try to read the load. */ | |
|
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971 # ifndef SUNOS_5 |
| 584 | 972 if (lseek (channel, offset, 0) == -1L |
| 973 || read (channel, (char *) load_ave, sizeof (load_ave)) | |
| 974 != sizeof (load_ave)) | |
| 975 { | |
| 976 close (channel); | |
| 5159 | 977 getloadavg_initialized = false; |
| 584 | 978 } |
|
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979 # else /* SUNOS_5 */ |
| 584 | 980 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) |
| 981 != sizeof (load_ave)) | |
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982 { |
|
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983 kvm_close (kd); |
| 5159 | 984 getloadavg_initialized = false; |
| 584 | 985 } |
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986 # endif /* SUNOS_5 */ |
| 584 | 987 } |
| 988 | |
| 989 if (offset == 0 || !getloadavg_initialized) | |
| 990 return -1; | |
|
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991 # endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ |
| 584 | 992 |
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993 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ |
| 584 | 994 if (nelem > 0) |
| 995 loadavg[elem++] = LDAV_CVT (load_ave[0]); | |
| 996 if (nelem > 1) | |
| 997 loadavg[elem++] = LDAV_CVT (load_ave[1]); | |
| 998 if (nelem > 2) | |
| 999 loadavg[elem++] = LDAV_CVT (load_ave[2]); | |
| 1000 | |
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1001 # define LDAV_DONE |
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1002 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */ |
| 584 | 1003 |
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1004 # if !defined LDAV_DONE |
| 584 | 1005 /* Set errno to zero to indicate that there was no particular error; |
| 1006 this function just can't work at all on this system. */ | |
| 1007 errno = 0; | |
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1008 elem = -1; |
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1009 # endif |
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1010 return elem; |
| 584 | 1011 } |
| 1012 | |
| 1013 #endif /* ! HAVE_GETLOADAVG */ | |
| 1014 | |
| 1015 #ifdef TEST | |
| 5159 | 1016 int |
|
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1017 main (int argc, char **argv) |
| 584 | 1018 { |
| 1019 int naptime = 0; | |
| 1020 | |
| 1021 if (argc > 1) | |
| 1022 naptime = atoi (argv[1]); | |
| 1023 | |
| 1024 while (1) | |
| 1025 { | |
| 1026 double avg[3]; | |
| 1027 int loads; | |
| 1028 | |
| 1029 errno = 0; /* Don't be misled if it doesn't set errno. */ | |
| 1030 loads = getloadavg (avg, 3); | |
| 1031 if (loads == -1) | |
| 1032 { | |
| 1033 perror ("Error getting load average"); | |
| 5159 | 1034 return EXIT_FAILURE; |
| 584 | 1035 } |
| 1036 if (loads > 0) | |
| 1037 printf ("1-minute: %f ", avg[0]); | |
| 1038 if (loads > 1) | |
| 1039 printf ("5-minute: %f ", avg[1]); | |
| 1040 if (loads > 2) | |
| 1041 printf ("15-minute: %f ", avg[2]); | |
| 1042 if (loads > 0) | |
| 1043 putchar ('\n'); | |
| 1044 | |
| 1045 if (naptime == 0) | |
| 1046 break; | |
| 1047 sleep (naptime); | |
| 1048 } | |
| 1049 | |
| 5159 | 1050 return EXIT_SUCCESS; |
| 584 | 1051 } |
| 1052 #endif /* TEST */ |