Mercurial > gnulib
annotate lib/getloadavg.c @ 18626:12df2165ec1c
version-etc: new year
* build-aux/gendocs.sh (version):
* doc/gendocs_template:
* doc/gendocs_template_min:
* doc/gnulib.texi:
* lib/version-etc.c (COPYRIGHT_YEAR):
Update copyright dates by hand in templates and the like.
* all files: Run 'make update-copyright'.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Sun, 01 Jan 2017 02:59:23 +0000 |
| parents | 31b2239ca59c |
| children | 9759915b2aca |
| rev | line source |
|---|---|
| 584 | 1 /* Get the system load averages. |
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2 |
| 18626 | 3 Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2017 Free Software |
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4 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 |
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9 This program is free software: you can redistribute it and/or modify |
| 584 | 10 it under the terms of the GNU General Public License as published by |
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11 the Free Software Foundation; either version 3 of the License, or |
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12 (at your option) any later version. |
| 584 | 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 | |
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20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 584 | 21 |
| 22 /* Compile-time symbols that this file uses: | |
| 23 | |
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24 HAVE_PSTAT_GETDYNAMIC Define this if your system has the |
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25 pstat_getdynamic function. I think it |
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26 is unique to HPUX9. The best way to get the |
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27 definition is through the AC_FUNC_GETLOADAVG |
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28 macro that comes with autoconf 2.13 or newer. |
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29 If that isn't an option, then just put |
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30 AC_CHECK_FUNCS(pstat_getdynamic) in your |
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31 configure.ac file. |
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32 HAVE_LIBPERFSTAT Define this if your system has the |
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33 perfstat_cpu_total function in libperfstat (AIX). |
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34 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. |
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35 KERNEL_FILE Name of the kernel file to nlist. |
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36 LDAV_CVT() Scale the load average from the kernel. |
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37 Returns a double. |
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38 LDAV_SYMBOL Name of kernel symbol giving load average. |
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39 LOAD_AVE_TYPE Type of the load average array in the kernel. |
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40 Must be defined unless one of |
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41 apollo, DGUX, NeXT, or UMAX is defined; |
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42 or we have libkstat; |
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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. |
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46 NLIST_STRUCT Include nlist.h, not a.out.h. |
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47 N_NAME_POINTER The nlist n_name element is a pointer, |
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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'. |
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50 LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing |
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51 load averages. |
| 584 | 52 |
| 53 Specific system predefines this file uses, aside from setting | |
| 54 default values if not emacs: | |
| 55 | |
| 56 apollo | |
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57 BSD Real BSD, not just BSD-like. |
| 584 | 58 convex |
| 59 DGUX | |
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60 eunice UNIX emulator under VMS. |
| 584 | 61 hpux |
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62 __MSDOS__ No-op for MSDOS. |
| 584 | 63 NeXT |
| 64 sgi | |
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65 sequent Sequent Dynix 3.x.x (BSD) |
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66 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) |
| 584 | 67 sony_news NEWS-OS (works at least for 4.1C) |
| 68 UMAX | |
| 69 UMAX4_3 | |
| 70 VMS | |
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71 WINDOWS32 No-op for Windows95/NT. |
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72 __linux__ Linux: assumes /proc file system mounted. |
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73 Support from Michael K. Johnson. |
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74 __CYGWIN__ Cygwin emulates linux /proc/loadavg. |
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75 __NetBSD__ NetBSD: assumes /kern file system mounted. |
| 584 | 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 | |
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83 #include <config.h> |
| 584 | 84 |
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85 /* Specification. */ |
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86 #include <stdlib.h> |
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87 |
| 5159 | 88 #include <errno.h> |
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89 #include <stdbool.h> |
| 5159 | 90 #include <stdio.h> |
| 91 | |
| 92 # include <sys/types.h> | |
| 584 | 93 |
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94 # if HAVE_SYS_PARAM_H |
| 5159 | 95 # include <sys/param.h> |
| 96 # endif | |
| 584 | 97 |
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98 # include "intprops.h" |
| 584 | 99 |
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100 # if !defined (BSD) && defined (ultrix) |
| 584 | 101 /* Ultrix behaves like BSD on Vaxen. */ |
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102 # define BSD |
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103 # endif |
| 584 | 104 |
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105 # ifdef NeXT |
| 584 | 106 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which |
| 107 conflicts with the definition understood in this file, that this | |
| 108 really is BSD. */ | |
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109 # undef BSD |
| 584 | 110 |
| 111 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being | |
| 112 defined to mean that the nlist method should be used, which is not true. */ | |
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113 # undef FSCALE |
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114 # endif |
| 584 | 115 |
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116 /* Same issues as for NeXT apply to the HURD-based GNU system. */ |
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117 # ifdef __GNU__ |
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118 # undef BSD |
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119 # undef FSCALE |
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120 # endif /* __GNU__ */ |
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121 |
| 584 | 122 /* Set values that are different from the defaults, which are |
| 123 set a little farther down with #ifndef. */ | |
| 124 | |
| 125 | |
| 126 /* Some shorthands. */ | |
| 127 | |
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128 # if defined (HPUX) && !defined (hpux) |
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129 # define hpux |
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130 # endif |
| 584 | 131 |
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132 # if defined (__hpux) && !defined (hpux) |
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133 # define hpux |
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134 # endif |
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135 |
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136 # if defined (__sun) && !defined (sun) |
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137 # define sun |
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138 # endif |
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139 |
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140 # if defined (hp300) && !defined (hpux) |
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141 # define MORE_BSD |
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142 # endif |
| 584 | 143 |
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144 # if defined (ultrix) && defined (mips) |
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145 # define decstation |
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146 # endif |
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148 # if defined (__SVR4) && !defined (SVR4) |
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149 # define SVR4 |
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150 # endif |
| 798 | 151 |
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152 # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) |
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153 # define SUNOS_5 |
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154 # endif |
| 584 | 155 |
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156 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) |
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157 # define OSF_ALPHA |
| 986 | 158 # include <sys/mbuf.h> |
| 159 # include <sys/socket.h> | |
| 160 # include <net/route.h> | |
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161 # include <sys/table.h> |
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162 /* Tru64 4.0D's table.h redefines sys */ |
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163 # undef sys |
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164 # endif |
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166 # if defined (__osf__) && (defined (mips) || defined (__mips__)) |
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167 # define OSF_MIPS |
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168 # include <sys/table.h> |
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169 # endif |
| 584 | 170 |
| 171 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by | |
| 172 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine | |
| 173 that with a couple of other things and we'll have a unique match. */ | |
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174 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) |
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175 # define tek4300 /* Define by emacs, but not by other users. */ |
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176 # endif |
| 584 | 177 |
| 178 | |
| 179 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ | |
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180 # ifndef LOAD_AVE_TYPE |
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182 # ifdef MORE_BSD |
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183 # define LOAD_AVE_TYPE long |
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184 # endif |
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186 # ifdef sun |
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187 # define LOAD_AVE_TYPE long |
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188 # endif |
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190 # ifdef decstation |
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191 # define LOAD_AVE_TYPE long |
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192 # endif |
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194 # ifdef _SEQUENT_ |
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195 # define LOAD_AVE_TYPE long |
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196 # endif |
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198 # ifdef sgi |
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199 # define LOAD_AVE_TYPE long |
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200 # endif |
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202 # ifdef SVR4 |
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203 # define LOAD_AVE_TYPE long |
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204 # endif |
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206 # ifdef sony_news |
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207 # define LOAD_AVE_TYPE long |
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208 # endif |
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210 # ifdef sequent |
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211 # define LOAD_AVE_TYPE long |
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212 # endif |
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214 # ifdef OSF_ALPHA |
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215 # define LOAD_AVE_TYPE long |
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216 # endif |
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218 # if defined (ardent) && defined (titan) |
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219 # define LOAD_AVE_TYPE long |
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220 # endif |
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222 # ifdef tek4300 |
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223 # define LOAD_AVE_TYPE long |
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224 # endif |
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226 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ |
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227 # define LOAD_AVE_TYPE long |
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228 # endif |
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230 # if defined _AIX && ! defined HAVE_LIBPERFSTAT |
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231 # define LOAD_AVE_TYPE long |
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232 # endif |
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234 # ifdef convex |
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235 # define LOAD_AVE_TYPE double |
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236 # ifndef LDAV_CVT |
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237 # define LDAV_CVT(n) (n) |
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238 # endif |
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239 # endif |
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241 # endif /* No LOAD_AVE_TYPE. */ |
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243 # ifdef OSF_ALPHA |
| 584 | 244 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, |
| 245 according to ghazi@noc.rutgers.edu. */ | |
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246 # undef FSCALE |
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247 # define FSCALE 1024.0 |
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248 # endif |
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250 # if defined (alliant) && defined (i860) /* Alliant FX/2800 */ |
| 584 | 251 /* <sys/param.h> defines an incorrect value for FSCALE on an |
| 252 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */ | |
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253 # undef FSCALE |
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254 # define FSCALE 100.0 |
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255 # endif |
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| 257 | |
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258 # ifndef FSCALE |
| 584 | 259 |
| 260 /* SunOS and some others define FSCALE in sys/param.h. */ | |
| 261 | |
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262 # ifdef MORE_BSD |
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263 # define FSCALE 2048.0 |
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264 # endif |
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266 # if defined (MIPS) || defined (SVR4) || defined (decstation) |
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267 # define FSCALE 256 |
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268 # endif |
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270 # if defined (sgi) || defined (sequent) |
| 584 | 271 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined |
| 272 above under #ifdef MIPS. But we want the sgi value. */ | |
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273 # undef FSCALE |
| 987 | 274 # define FSCALE 1000.0 |
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275 # endif |
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277 # if defined (ardent) && defined (titan) |
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278 # define FSCALE 65536.0 |
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279 # endif |
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281 # ifdef tek4300 |
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282 # define FSCALE 100.0 |
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283 # endif |
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285 # if defined _AIX && !defined HAVE_LIBPERFSTAT |
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286 # define FSCALE 65536.0 |
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287 # endif |
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289 # endif /* Not FSCALE. */ |
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291 # if !defined (LDAV_CVT) && defined (FSCALE) |
| 987 | 292 # define LDAV_CVT(n) (((double) (n)) / FSCALE) |
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293 # endif |
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295 # ifndef NLIST_STRUCT |
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296 # if HAVE_NLIST_H |
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297 # define NLIST_STRUCT |
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298 # endif |
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299 # endif |
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300 |
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301 # if defined (sgi) || (defined (mips) && !defined (BSD)) |
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302 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) |
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303 # endif |
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| 305 | |
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306 # if !defined (KERNEL_FILE) && defined (sequent) |
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307 # define KERNEL_FILE "/dynix" |
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308 # endif |
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310 # if !defined (KERNEL_FILE) && defined (hpux) |
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311 # define KERNEL_FILE "/hp-ux" |
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312 # endif |
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314 # if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan))) |
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315 # define KERNEL_FILE "/unix" |
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316 # endif |
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| 318 | |
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319 # if !defined (LDAV_SYMBOL) && defined (alliant) |
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320 # define LDAV_SYMBOL "_Loadavg" |
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321 # endif |
| 584 | 322 |
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323 # 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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324 # define LDAV_SYMBOL "avenrun" |
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325 # endif |
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327 # include <unistd.h> |
| 584 | 328 |
| 329 /* LOAD_AVE_TYPE should only get defined if we're going to use the | |
| 330 nlist method. */ | |
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331 # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL)) |
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332 # define LOAD_AVE_TYPE double |
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333 # endif |
| 584 | 334 |
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335 # ifdef LOAD_AVE_TYPE |
| 584 | 336 |
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337 # ifndef __VMS |
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338 # ifndef __linux__ |
| 2609 | 339 # ifndef NLIST_STRUCT |
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340 # include <a.out.h> |
| 2609 | 341 # else /* NLIST_STRUCT */ |
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342 # include <nlist.h> |
| 2609 | 343 # endif /* NLIST_STRUCT */ |
| 584 | 344 |
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345 # ifdef SUNOS_5 |
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346 # include <kvm.h> |
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347 # include <kstat.h> |
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348 # endif |
| 584 | 349 |
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350 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
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351 # include <sys/pstat.h> |
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352 # endif |
| 584 | 353 |
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354 # ifndef KERNEL_FILE |
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355 # define KERNEL_FILE "/vmunix" |
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356 # endif /* KERNEL_FILE */ |
| 584 | 357 |
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358 # ifndef LDAV_SYMBOL |
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359 # define LDAV_SYMBOL "_avenrun" |
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360 # endif /* LDAV_SYMBOL */ |
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361 # endif /* __linux__ */ |
| 584 | 362 |
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363 # else /* __VMS */ |
| 584 | 364 |
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365 # ifndef eunice |
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366 # include <iodef.h> |
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367 # include <descrip.h> |
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368 # else /* eunice */ |
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369 # include <vms/iodef.h> |
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370 # endif /* eunice */ |
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371 # endif /* __VMS */ |
| 584 | 372 |
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373 # ifndef LDAV_CVT |
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374 # define LDAV_CVT(n) ((double) (n)) |
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375 # endif /* !LDAV_CVT */ |
| 584 | 376 |
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377 # endif /* LOAD_AVE_TYPE */ |
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378 |
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379 # if defined HAVE_LIBPERFSTAT |
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380 # include <sys/protosw.h> |
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381 # include <libperfstat.h> |
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382 # include <sys/proc.h> |
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383 # ifndef SBITS |
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384 # define SBITS 16 |
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385 # endif |
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386 # endif |
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387 |
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388 # if defined (__GNU__) && !defined (NeXT) |
| 986 | 389 /* Note that NeXT Openstep defines __GNU__ even though it should not. */ |
| 390 /* GNU system acts much like NeXT, for load average purposes, | |
| 391 but not exactly. */ | |
| 392 # define NeXT | |
| 393 # define host_self mach_host_self | |
| 394 # endif | |
| 395 | |
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396 # ifdef NeXT |
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397 # ifdef HAVE_MACH_MACH_H |
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398 # include <mach/mach.h> |
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399 # else |
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400 # include <mach.h> |
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401 # endif |
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402 # endif /* NeXT */ |
| 584 | 403 |
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404 # ifdef sgi |
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405 # include <sys/sysmp.h> |
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406 # endif /* sgi */ |
| 584 | 407 |
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408 # ifdef UMAX |
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409 # include <signal.h> |
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410 # include <sys/time.h> |
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411 # include <sys/wait.h> |
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412 # include <sys/syscall.h> |
| 584 | 413 |
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414 # ifdef UMAX_43 |
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415 # include <machine/cpu.h> |
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416 # include <inq_stats/statistics.h> |
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417 # include <inq_stats/sysstats.h> |
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418 # include <inq_stats/cpustats.h> |
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419 # include <inq_stats/procstats.h> |
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420 # else /* Not UMAX_43. */ |
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421 # include <sys/sysdefs.h> |
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422 # include <sys/statistics.h> |
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423 # include <sys/sysstats.h> |
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424 # include <sys/cpudefs.h> |
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425 # include <sys/cpustats.h> |
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426 # include <sys/procstats.h> |
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427 # endif /* Not UMAX_43. */ |
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428 # endif /* UMAX */ |
| 584 | 429 |
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430 # ifdef DGUX |
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431 # include <sys/dg_sys_info.h> |
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432 # endif |
| 584 | 433 |
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434 # if (defined __linux__ || defined __CYGWIN__ || defined SUNOS_5 \ |
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435 || (defined LOAD_AVE_TYPE && ! defined __VMS)) |
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436 # include <fcntl.h> |
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437 # endif |
| 584 | 438 |
| 439 /* Avoid static vars inside a function since in HPUX they dump as pure. */ | |
| 440 | |
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441 # ifdef NeXT |
| 584 | 442 static processor_set_t default_set; |
| 5159 | 443 static bool getloadavg_initialized; |
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444 # endif /* NeXT */ |
| 584 | 445 |
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446 # ifdef UMAX |
| 584 | 447 static unsigned int cpus = 0; |
| 448 static unsigned int samples; | |
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449 # endif /* UMAX */ |
| 584 | 450 |
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451 # ifdef DGUX |
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452 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ |
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453 # endif /* DGUX */ |
| 584 | 454 |
| 4704 | 455 # if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE) |
| 584 | 456 /* File descriptor open to /dev/kmem or VMS load ave driver. */ |
| 457 static int channel; | |
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458 /* True if channel is valid. */ |
| 5159 | 459 static bool getloadavg_initialized; |
| 584 | 460 /* Offset in kmem to seek to read load average, or 0 means invalid. */ |
| 461 static long offset; | |
| 462 | |
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463 # if ! defined __VMS && ! defined sgi && ! defined __linux__ |
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464 static struct nlist name_list[2]; |
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465 # endif |
| 584 | 466 |
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467 # ifdef SUNOS_5 |
| 584 | 468 static kvm_t *kd; |
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469 # endif /* SUNOS_5 */ |
| 584 | 470 |
| 4704 | 471 # endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ |
| 584 | 472 |
| 473 /* Put the 1 minute, 5 minute and 15 minute load averages | |
| 474 into the first NELEM elements of LOADAVG. | |
| 475 Return the number written (never more than 3, but may be less than NELEM), | |
| 14355 | 476 or -1 (setting errno) if an error occurred. */ |
| 584 | 477 |
| 478 int | |
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479 getloadavg (double loadavg[], int nelem) |
| 584 | 480 { |
|
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481 int elem = 0; /* Return value. */ |
| 584 | 482 |
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483 # ifdef NO_GET_LOAD_AVG |
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484 # define LDAV_DONE |
| 14355 | 485 errno = ENOSYS; |
| 584 | 486 elem = -1; |
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487 # endif |
| 584 | 488 |
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489 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) /* Solaris <= 2.6 */ |
| 694 | 490 /* Use libkstat because we don't have to be root. */ |
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491 # define LDAV_DONE |
| 694 | 492 kstat_ctl_t *kc; |
| 493 kstat_t *ksp; | |
| 494 kstat_named_t *kn; | |
| 14355 | 495 int saved_errno; |
| 694 | 496 |
| 497 kc = kstat_open (); | |
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498 if (kc == 0) |
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499 return -1; |
| 694 | 500 ksp = kstat_lookup (kc, "unix", 0, "system_misc"); |
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501 if (ksp == 0) |
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502 return -1; |
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503 if (kstat_read (kc, ksp, 0) == -1) |
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504 return -1; |
|
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505 |
| 694 | 506 |
| 507 kn = kstat_data_lookup (ksp, "avenrun_1min"); | |
| 508 if (kn == 0) | |
| 509 { | |
| 510 /* Return -1 if no load average information is available. */ | |
| 511 nelem = 0; | |
| 512 elem = -1; | |
| 513 } | |
| 514 | |
| 515 if (nelem >= 1) | |
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516 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 694 | 517 |
| 518 if (nelem >= 2) | |
| 519 { | |
| 520 kn = kstat_data_lookup (ksp, "avenrun_5min"); | |
| 521 if (kn != 0) | |
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522 { |
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523 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 694 | 524 |
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525 if (nelem >= 3) |
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526 { |
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527 kn = kstat_data_lookup (ksp, "avenrun_15min"); |
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528 if (kn != 0) |
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529 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
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530 } |
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531 } |
| 694 | 532 } |
| 533 | |
| 14355 | 534 saved_errno = errno; |
| 694 | 535 kstat_close (kc); |
| 14355 | 536 errno = saved_errno; |
| 986 | 537 # endif /* HAVE_LIBKSTAT */ |
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538 |
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539 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
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540 /* HP-UX */ |
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541 /* Use pstat_getdynamic() because we don't have to be root. */ |
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542 # define LDAV_DONE |
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543 # undef LOAD_AVE_TYPE |
| 694 | 544 |
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545 struct pst_dynamic dyn_info; |
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546 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0) |
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547 return -1; |
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548 if (nelem > 0) |
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549 loadavg[elem++] = dyn_info.psd_avg_1_min; |
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550 if (nelem > 1) |
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551 loadavg[elem++] = dyn_info.psd_avg_5_min; |
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552 if (nelem > 2) |
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553 loadavg[elem++] = dyn_info.psd_avg_15_min; |
| 584 | 554 |
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555 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ |
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556 |
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557 # if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT /* AIX */ |
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558 # define LDAV_DONE |
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559 # undef LOAD_AVE_TYPE |
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560 /* Use perfstat_cpu_total because we don't have to be root. */ |
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561 { |
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562 perfstat_cpu_total_t cpu_stats; |
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563 int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1); |
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564 if (result == -1) |
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565 return result; |
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566 loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS); |
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567 loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS); |
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568 loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS); |
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569 elem = 3; |
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570 } |
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571 # endif |
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572 |
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573 # if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) |
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574 /* Linux without glibc, Cygwin */ |
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575 # define LDAV_DONE |
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576 # undef LOAD_AVE_TYPE |
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577 |
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578 # ifndef LINUX_LDAV_FILE |
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579 # define LINUX_LDAV_FILE "/proc/loadavg" |
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580 # endif |
| 584 | 581 |
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582 char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")]; |
| 5159 | 583 char const *ptr = ldavgbuf; |
| 14355 | 584 int fd, count, saved_errno; |
| 584 | 585 |
| 586 fd = open (LINUX_LDAV_FILE, O_RDONLY); | |
| 587 if (fd == -1) | |
| 588 return -1; | |
| 5159 | 589 count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); |
| 14355 | 590 saved_errno = errno; |
| 584 | 591 (void) close (fd); |
| 14355 | 592 errno = saved_errno; |
| 584 | 593 if (count <= 0) |
| 594 return -1; | |
| 5159 | 595 ldavgbuf[count] = '\0'; |
| 584 | 596 |
| 5159 | 597 for (elem = 0; elem < nelem; elem++) |
| 598 { | |
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599 double numerator = 0; |
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600 double denominator = 1; |
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601 |
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602 while (*ptr == ' ') |
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603 ptr++; |
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604 |
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605 /* Finish if this number is missing, and report an error if all |
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606 were missing. */ |
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607 if (! ('0' <= *ptr && *ptr <= '9')) |
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608 { |
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609 if (elem == 0) |
| 14355 | 610 { |
| 611 errno = ENOTSUP; | |
| 612 return -1; | |
| 613 } | |
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614 break; |
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615 } |
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616 |
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617 while ('0' <= *ptr && *ptr <= '9') |
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618 numerator = 10 * numerator + (*ptr++ - '0'); |
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619 |
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620 if (*ptr == '.') |
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621 for (ptr++; '0' <= *ptr && *ptr <= '9'; ptr++) |
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622 numerator = 10 * numerator + (*ptr - '0'), denominator *= 10; |
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623 |
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624 loadavg[elem++] = numerator / denominator; |
| 5159 | 625 } |
| 584 | 626 |
| 627 return elem; | |
| 628 | |
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629 # endif /* __linux__ || __CYGWIN__ */ |
| 584 | 630 |
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631 # if !defined (LDAV_DONE) && defined (__NetBSD__) /* NetBSD < 0.9 */ |
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632 # define LDAV_DONE |
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633 # undef LOAD_AVE_TYPE |
| 584 | 634 |
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635 # ifndef NETBSD_LDAV_FILE |
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636 # define NETBSD_LDAV_FILE "/kern/loadavg" |
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637 # endif |
| 584 | 638 |
| 639 unsigned long int load_ave[3], scale; | |
| 640 int count; | |
| 641 FILE *fp; | |
| 642 | |
| 643 fp = fopen (NETBSD_LDAV_FILE, "r"); | |
| 644 if (fp == NULL) | |
| 645 return -1; | |
| 646 count = fscanf (fp, "%lu %lu %lu %lu\n", | |
|
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647 &load_ave[0], &load_ave[1], &load_ave[2], |
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648 &scale); |
| 584 | 649 (void) fclose (fp); |
| 650 if (count != 4) | |
| 14355 | 651 { |
| 652 errno = ENOTSUP; | |
| 653 return -1; | |
| 654 } | |
| 584 | 655 |
| 656 for (elem = 0; elem < nelem; elem++) | |
| 657 loadavg[elem] = (double) load_ave[elem] / (double) scale; | |
| 658 | |
| 659 return elem; | |
| 660 | |
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661 # endif /* __NetBSD__ */ |
| 584 | 662 |
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663 # if !defined (LDAV_DONE) && defined (NeXT) /* NeXTStep */ |
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664 # define LDAV_DONE |
| 584 | 665 /* The NeXT code was adapted from iscreen 3.2. */ |
| 666 | |
| 667 host_t host; | |
| 668 struct processor_set_basic_info info; | |
| 5159 | 669 unsigned int info_count; |
| 584 | 670 |
| 671 /* We only know how to get the 1-minute average for this system, | |
| 672 so even if the caller asks for more than 1, we only return 1. */ | |
| 673 | |
| 674 if (!getloadavg_initialized) | |
| 675 { | |
| 676 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) | |
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677 getloadavg_initialized = true; |
| 584 | 678 } |
| 679 | |
| 680 if (getloadavg_initialized) | |
| 681 { | |
| 682 info_count = PROCESSOR_SET_BASIC_INFO_COUNT; | |
| 683 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, | |
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684 (processor_set_info_t) &info, &info_count) |
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685 != KERN_SUCCESS) |
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686 getloadavg_initialized = false; |
| 584 | 687 else |
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688 { |
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689 if (nelem > 0) |
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690 loadavg[elem++] = (double) info.load_average / LOAD_SCALE; |
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691 } |
| 584 | 692 } |
| 693 | |
| 694 if (!getloadavg_initialized) | |
| 14355 | 695 { |
| 696 errno = ENOTSUP; | |
| 697 return -1; | |
| 698 } | |
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699 # endif /* NeXT */ |
| 584 | 700 |
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701 # if !defined (LDAV_DONE) && defined (UMAX) |
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702 # define LDAV_DONE |
| 584 | 703 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not |
| 704 have a /dev/kmem. Information about the workings of the running kernel | |
| 705 can be gathered with inq_stats system calls. | |
| 706 We only know how to get the 1-minute average for this system. */ | |
| 707 | |
| 708 struct proc_summary proc_sum_data; | |
| 709 struct stat_descr proc_info; | |
| 710 double load; | |
| 711 register unsigned int i, j; | |
| 712 | |
| 713 if (cpus == 0) | |
| 714 { | |
| 715 register unsigned int c, i; | |
| 716 struct cpu_config conf; | |
| 717 struct stat_descr desc; | |
| 718 | |
| 719 desc.sd_next = 0; | |
| 720 desc.sd_subsys = SUBSYS_CPU; | |
| 721 desc.sd_type = CPUTYPE_CONFIG; | |
| 722 desc.sd_addr = (char *) &conf; | |
| 723 desc.sd_size = sizeof conf; | |
| 724 | |
| 725 if (inq_stats (1, &desc)) | |
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726 return -1; |
| 584 | 727 |
| 728 c = 0; | |
| 729 for (i = 0; i < conf.config_maxclass; ++i) | |
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730 { |
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731 struct class_stats stats; |
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732 memset (&stats, 0, sizeof stats); |
| 584 | 733 |
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734 desc.sd_type = CPUTYPE_CLASS; |
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735 desc.sd_objid = i; |
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736 desc.sd_addr = (char *) &stats; |
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737 desc.sd_size = sizeof stats; |
| 584 | 738 |
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739 if (inq_stats (1, &desc)) |
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740 return -1; |
| 584 | 741 |
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742 c += stats.class_numcpus; |
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743 } |
| 584 | 744 cpus = c; |
| 745 samples = cpus < 2 ? 3 : (2 * cpus / 3); | |
| 746 } | |
| 747 | |
| 748 proc_info.sd_next = 0; | |
| 749 proc_info.sd_subsys = SUBSYS_PROC; | |
| 750 proc_info.sd_type = PROCTYPE_SUMMARY; | |
| 751 proc_info.sd_addr = (char *) &proc_sum_data; | |
| 752 proc_info.sd_size = sizeof (struct proc_summary); | |
| 753 proc_info.sd_sizeused = 0; | |
| 754 | |
| 755 if (inq_stats (1, &proc_info) != 0) | |
| 756 return -1; | |
| 757 | |
| 758 load = proc_sum_data.ps_nrunnable; | |
| 759 j = 0; | |
| 760 for (i = samples - 1; i > 0; --i) | |
| 761 { | |
| 762 load += proc_sum_data.ps_nrun[j]; | |
| 763 if (j++ == PS_NRUNSIZE) | |
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764 j = 0; |
| 584 | 765 } |
| 766 | |
| 767 if (nelem > 0) | |
| 768 loadavg[elem++] = load / samples / cpus; | |
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769 # endif /* UMAX */ |
| 584 | 770 |
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771 # if !defined (LDAV_DONE) && defined (DGUX) |
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772 # define LDAV_DONE |
| 584 | 773 /* This call can return -1 for an error, but with good args |
| 774 it's not supposed to fail. The first argument is for no | |
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775 apparent reason of type 'long int *'. */ |
| 584 | 776 dg_sys_info ((long int *) &load_info, |
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777 DG_SYS_INFO_LOAD_INFO_TYPE, |
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778 DG_SYS_INFO_LOAD_VERSION_0); |
| 584 | 779 |
| 780 if (nelem > 0) | |
| 781 loadavg[elem++] = load_info.one_minute; | |
| 782 if (nelem > 1) | |
| 783 loadavg[elem++] = load_info.five_minute; | |
| 784 if (nelem > 2) | |
| 785 loadavg[elem++] = load_info.fifteen_minute; | |
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786 # endif /* DGUX */ |
| 584 | 787 |
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788 # if !defined (LDAV_DONE) && defined (apollo) |
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789 # define LDAV_DONE |
| 584 | 790 /* Apollo code from lisch@mentorg.com (Ray Lischner). |
| 791 | |
| 792 This system call is not documented. The load average is obtained as | |
| 793 three long integers, for the load average over the past minute, | |
| 794 five minutes, and fifteen minutes. Each value is a scaled integer, | |
| 795 with 16 bits of integer part and 16 bits of fraction part. | |
| 796 | |
| 797 I'm not sure which operating system first supported this system call, | |
| 798 but I know that SR10.2 supports it. */ | |
| 799 | |
| 800 extern void proc1_$get_loadav (); | |
| 801 unsigned long load_ave[3]; | |
| 802 | |
| 803 proc1_$get_loadav (load_ave); | |
| 804 | |
| 805 if (nelem > 0) | |
| 806 loadavg[elem++] = load_ave[0] / 65536.0; | |
| 807 if (nelem > 1) | |
| 808 loadavg[elem++] = load_ave[1] / 65536.0; | |
| 809 if (nelem > 2) | |
| 810 loadavg[elem++] = load_ave[2] / 65536.0; | |
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811 # endif /* apollo */ |
| 584 | 812 |
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813 # if !defined (LDAV_DONE) && defined (OSF_MIPS) |
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814 # define LDAV_DONE |
| 584 | 815 |
| 816 struct tbl_loadavg load_ave; | |
| 817 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 818 loadavg[elem++] | |
| 819 = (load_ave.tl_lscale == 0 | |
| 820 ? load_ave.tl_avenrun.d[0] | |
| 821 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); | |
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822 # endif /* OSF_MIPS */ |
| 584 | 823 |
| 986 | 824 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) |
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825 /* DJGPP */ |
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826 # define LDAV_DONE |
| 584 | 827 |
| 828 /* A faithful emulation is going to have to be saved for a rainy day. */ | |
| 694 | 829 for ( ; elem < nelem; elem++) |
| 584 | 830 { |
| 831 loadavg[elem] = 0.0; | |
| 832 } | |
| 986 | 833 # endif /* __MSDOS__ || WINDOWS32 */ |
| 584 | 834 |
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835 # if !defined (LDAV_DONE) && defined (OSF_ALPHA) /* OSF/1 */ |
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836 # define LDAV_DONE |
| 584 | 837 |
| 838 struct tbl_loadavg load_ave; | |
| 839 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 840 for (elem = 0; elem < nelem; elem++) | |
| 841 loadavg[elem] | |
| 842 = (load_ave.tl_lscale == 0 | |
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843 ? load_ave.tl_avenrun.d[elem] |
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844 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale)); |
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845 # endif /* OSF_ALPHA */ |
| 584 | 846 |
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847 # if ! defined LDAV_DONE && defined __VMS /* VMS */ |
| 584 | 848 /* VMS specific code -- read from the Load Ave driver. */ |
| 849 | |
| 850 LOAD_AVE_TYPE load_ave[3]; | |
| 5159 | 851 static bool getloadavg_initialized; |
|
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852 # ifdef eunice |
| 584 | 853 struct |
| 854 { | |
| 855 int dsc$w_length; | |
| 856 char *dsc$a_pointer; | |
| 857 } descriptor; | |
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858 # endif |
| 584 | 859 |
| 860 /* Ensure that there is a channel open to the load ave device. */ | |
| 861 if (!getloadavg_initialized) | |
| 862 { | |
| 863 /* Attempt to open the channel. */ | |
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864 # ifdef eunice |
| 584 | 865 descriptor.dsc$w_length = 18; |
| 866 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; | |
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867 # else |
| 584 | 868 $DESCRIPTOR (descriptor, "LAV0:"); |
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869 # endif |
| 584 | 870 if (sys$assign (&descriptor, &channel, 0, 0) & 1) |
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871 getloadavg_initialized = true; |
| 584 | 872 } |
| 873 | |
| 874 /* Read the load average vector. */ | |
| 875 if (getloadavg_initialized | |
| 876 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, | |
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877 load_ave, 12, 0, 0, 0, 0) & 1)) |
| 584 | 878 { |
| 879 sys$dassgn (channel); | |
| 5159 | 880 getloadavg_initialized = false; |
| 584 | 881 } |
| 882 | |
| 883 if (!getloadavg_initialized) | |
| 14355 | 884 { |
| 885 errno = ENOTSUP; | |
| 886 return -1; | |
| 887 } | |
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888 # endif /* ! defined LDAV_DONE && defined __VMS */ |
| 584 | 889 |
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890 # if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS |
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891 /* IRIX, other old systems */ |
| 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 |
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904 strcpy (name_list[0].n_name, LDAV_SYMBOL); |
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905 strcpy (name_list[1].n_name, ""); |
| 2609 | 906 # else /* NLIST_STRUCT */ |
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907 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME |
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908 name_list[0].n_un.n_name = LDAV_SYMBOL; |
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909 name_list[1].n_un.n_name = 0; |
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910 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
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911 name_list[0].n_name = LDAV_SYMBOL; |
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912 name_list[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)) |
|
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|
919 nlist (KERNEL_FILE, name_list) |
|
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920 # else /* _AIX */ |
|
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921 knlist (name_list, 1, sizeof (name_list[0])) |
|
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922 # endif |
|
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923 >= 0) |
|
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924 /* Omit "&& name_list[0].n_type != 0 " -- it breaks on Sun386i. */ |
|
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925 { |
|
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926 # ifdef FIXUP_KERNEL_SYMBOL_ADDR |
|
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927 FIXUP_KERNEL_SYMBOL_ADDR (name_list); |
|
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928 # endif |
|
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929 offset = name_list[0].n_value; |
|
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930 } |
|
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931 # endif /* !SUNOS_5 */ |
|
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932 # else /* sgi */ |
|
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* lib/getloadavg.c (getloadavg) [sgi]: Make ldav_off of type ptrdiff_t.
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933 ptrdiff_t ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); |
|
848
a663b54fd42b
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|
934 if (ldav_off != -1) |
|
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935 offset = (long int) ldav_off & 0x7fffffff; |
|
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936 # endif /* sgi */ |
|
848
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|
937 } |
| 584 | 938 |
| 939 /* Make sure we have /dev/kmem open. */ | |
| 940 if (!getloadavg_initialized) | |
| 941 { | |
|
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942 # ifndef SUNOS_5 |
|
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943 /* Set the channel to close on exec, so it does not |
|
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944 litter any child's descriptor table. */ |
|
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945 # ifndef O_CLOEXEC |
|
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946 # define O_CLOEXEC 0 |
|
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947 # endif |
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948 int fd = open ("/dev/kmem", O_RDONLY | O_CLOEXEC); |
|
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|
949 if (0 <= fd) |
|
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950 { |
|
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951 # if F_DUPFD_CLOEXEC |
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952 if (fd <= STDERR_FILENO) |
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953 { |
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954 int fd1 = fcntl (fd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1); |
|
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955 close (fd); |
|
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956 fd = fd1; |
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957 } |
|
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958 # endif |
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959 if (0 <= fd) |
|
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960 { |
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961 channel = fd; |
|
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962 getloadavg_initialized = true; |
|
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963 } |
|
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964 } |
|
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965 # else /* SUNOS_5 */ |
| 584 | 966 /* We pass 0 for the kernel, corefile, and swapfile names |
|
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967 to use the currently running kernel. */ |
| 584 | 968 kd = kvm_open (0, 0, 0, O_RDONLY, 0); |
| 694 | 969 if (kd != 0) |
|
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970 { |
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971 /* nlist the currently running kernel. */ |
|
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972 kvm_nlist (kd, name_list); |
|
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973 offset = name_list[0].n_value; |
|
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974 getloadavg_initialized = true; |
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975 } |
|
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976 # endif /* SUNOS_5 */ |
| 584 | 977 } |
| 978 | |
| 979 /* If we can, get the load average values. */ | |
| 980 if (offset && getloadavg_initialized) | |
| 981 { | |
| 982 /* Try to read the load. */ | |
|
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|
983 # ifndef SUNOS_5 |
| 584 | 984 if (lseek (channel, offset, 0) == -1L |
|
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985 || read (channel, (char *) load_ave, sizeof (load_ave)) |
|
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|
986 != sizeof (load_ave)) |
|
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987 { |
|
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988 close (channel); |
|
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|
989 getloadavg_initialized = false; |
|
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990 } |
|
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|
991 # else /* SUNOS_5 */ |
| 584 | 992 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) |
|
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993 != sizeof (load_ave)) |
|
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994 { |
|
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|
995 kvm_close (kd); |
|
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996 getloadavg_initialized = false; |
|
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997 } |
|
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|
998 # endif /* SUNOS_5 */ |
| 584 | 999 } |
| 1000 | |
| 1001 if (offset == 0 || !getloadavg_initialized) | |
| 14355 | 1002 { |
| 1003 errno = ENOTSUP; | |
| 1004 return -1; | |
| 1005 } | |
|
6934
d68ff786c180
* lib/getloadavg.c: Use __VMS, not VMS.
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|
1006 # endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ |
| 584 | 1007 |
|
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|
1008 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ |
| 584 | 1009 if (nelem > 0) |
| 1010 loadavg[elem++] = LDAV_CVT (load_ave[0]); | |
| 1011 if (nelem > 1) | |
| 1012 loadavg[elem++] = LDAV_CVT (load_ave[1]); | |
| 1013 if (nelem > 2) | |
| 1014 loadavg[elem++] = LDAV_CVT (load_ave[2]); | |
| 1015 | |
|
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1016 # define LDAV_DONE |
|
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|
1017 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */ |
| 584 | 1018 |
|
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|
1019 # if !defined LDAV_DONE |
| 14355 | 1020 errno = ENOSYS; |
|
6270
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|
1021 elem = -1; |
|
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1022 # endif |
|
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|
1023 return elem; |
| 584 | 1024 } |