Mercurial > gnulib
annotate lib/getloadavg.c @ 40218:e92cc6824b7f
getloadavg: Write NULL for the null pointer.
Reported by Michal Privoznik <mprivozn@redhat.com>.
* lib/getloadavg.c (getloadavg): Write NULL instead of 0.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 03 Mar 2019 19:36:14 +0100 |
| parents | dd38f4180e3f |
| children |
| rev | line source |
|---|---|
| 584 | 1 /* Get the system load averages. |
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2 |
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3 Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2019 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 | |
| 19190 | 20 along with this program. If not, see <https://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__, __ANDROID__, __CYGWIN__]: File |
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51 containing 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 DGUX |
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59 eunice UNIX emulator under VMS. |
| 584 | 60 hpux |
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61 __MSDOS__ No-op for MSDOS. |
| 584 | 62 NeXT |
| 63 sgi | |
| 64 UMAX | |
| 65 UMAX4_3 | |
| 66 VMS | |
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67 _WIN32 Native Windows (possibly also defined on Cygwin) |
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68 __linux__, __ANDROID__ Linux: assumes /proc file system mounted. |
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69 Support from Michael K. Johnson. |
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70 __CYGWIN__ Cygwin emulates linux /proc/loadavg. |
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71 __NetBSD__ NetBSD: assumes /kern file system mounted. |
| 584 | 72 |
| 73 In addition, to avoid nesting many #ifdefs, we internally set | |
| 74 LDAV_DONE to indicate that the load average has been computed. | |
| 75 | |
| 76 We also #define LDAV_PRIVILEGED if a program will require | |
| 77 special installation to be able to call getloadavg. */ | |
| 78 | |
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79 #include <config.h> |
| 584 | 80 |
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81 /* Specification. */ |
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82 #include <stdlib.h> |
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83 |
| 5159 | 84 #include <errno.h> |
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85 #include <stdbool.h> |
| 5159 | 86 #include <stdio.h> |
| 87 | |
| 88 # include <sys/types.h> | |
| 584 | 89 |
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90 # if HAVE_SYS_PARAM_H |
| 5159 | 91 # include <sys/param.h> |
| 92 # endif | |
| 584 | 93 |
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94 # include "intprops.h" |
| 584 | 95 |
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96 # if defined _WIN32 && ! defined __CYGWIN__ && ! defined WINDOWS32 |
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97 # define WINDOWS32 |
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98 # endif |
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99 |
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100 # ifdef NeXT |
| 584 | 101 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which |
| 102 conflicts with the definition understood in this file, that this | |
| 103 really is BSD. */ | |
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104 # undef BSD |
| 584 | 105 |
| 106 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being | |
| 107 defined to mean that the nlist method should be used, which is not true. */ | |
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108 # undef FSCALE |
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109 # endif |
| 584 | 110 |
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111 /* Same issues as for NeXT apply to the HURD-based GNU system. */ |
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112 # ifdef __GNU__ |
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113 # undef BSD |
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114 # undef FSCALE |
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115 # endif /* __GNU__ */ |
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116 |
| 584 | 117 /* Set values that are different from the defaults, which are |
| 118 set a little farther down with #ifndef. */ | |
| 119 | |
| 120 | |
| 121 /* Some shorthands. */ | |
| 122 | |
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123 # if defined (HPUX) && !defined (hpux) |
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124 # define hpux |
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125 # endif |
| 584 | 126 |
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127 # if defined (__hpux) && !defined (hpux) |
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128 # define hpux |
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129 # endif |
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130 |
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131 # if defined (__sun) && !defined (sun) |
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132 # define sun |
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133 # endif |
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134 |
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135 # if defined (hp300) && !defined (hpux) |
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136 # define MORE_BSD |
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137 # endif |
| 584 | 138 |
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139 # if defined (__SVR4) && !defined (SVR4) |
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140 # define SVR4 |
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141 # endif |
| 798 | 142 |
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143 # if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) |
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144 # define SUNOS_5 |
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145 # endif |
| 584 | 146 |
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147 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) |
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148 # define OSF_ALPHA |
| 986 | 149 # include <sys/mbuf.h> |
| 150 # include <sys/socket.h> | |
| 151 # include <net/route.h> | |
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152 # include <sys/table.h> |
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153 /* Tru64 4.0D's table.h redefines sys */ |
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154 # undef sys |
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155 # endif |
| 584 | 156 |
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157 # if defined (__osf__) && (defined (mips) || defined (__mips__)) |
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158 # define OSF_MIPS |
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159 # include <sys/table.h> |
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160 # endif |
| 584 | 161 |
| 162 | |
| 163 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ | |
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164 # ifndef LOAD_AVE_TYPE |
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166 # ifdef MORE_BSD |
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167 # define LOAD_AVE_TYPE long |
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168 # endif |
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170 # ifdef sun |
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171 # define LOAD_AVE_TYPE long |
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172 # endif |
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174 # ifdef sgi |
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175 # define LOAD_AVE_TYPE long |
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176 # endif |
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178 # ifdef SVR4 |
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179 # define LOAD_AVE_TYPE long |
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180 # endif |
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182 # ifdef OSF_ALPHA |
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183 # define LOAD_AVE_TYPE long |
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184 # endif |
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186 # if defined _AIX && ! defined HAVE_LIBPERFSTAT |
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187 # define LOAD_AVE_TYPE long |
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188 # endif |
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190 # endif /* No LOAD_AVE_TYPE. */ |
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192 # ifdef OSF_ALPHA |
| 584 | 193 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, |
| 194 according to ghazi@noc.rutgers.edu. */ | |
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195 # undef FSCALE |
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196 # define FSCALE 1024.0 |
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197 # endif |
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| 199 | |
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200 # ifndef FSCALE |
| 584 | 201 |
| 202 /* SunOS and some others define FSCALE in sys/param.h. */ | |
| 203 | |
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204 # ifdef MORE_BSD |
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205 # define FSCALE 2048.0 |
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206 # endif |
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208 # if defined (MIPS) || defined (SVR4) |
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209 # define FSCALE 256 |
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210 # endif |
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212 # if defined (sgi) |
| 584 | 213 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined |
| 214 above under #ifdef MIPS. But we want the sgi value. */ | |
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215 # undef FSCALE |
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217 # endif |
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219 # if defined _AIX && !defined HAVE_LIBPERFSTAT |
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220 # define FSCALE 65536.0 |
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221 # endif |
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223 # endif /* Not FSCALE. */ |
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225 # if !defined (LDAV_CVT) && defined (FSCALE) |
| 987 | 226 # define LDAV_CVT(n) (((double) (n)) / FSCALE) |
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227 # endif |
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229 # ifndef NLIST_STRUCT |
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230 # if HAVE_NLIST_H |
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231 # define NLIST_STRUCT |
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232 # endif |
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233 # endif |
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234 |
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235 # if defined (sgi) || (defined (mips) && !defined (BSD)) |
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236 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) |
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237 # endif |
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| 239 | |
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240 # if !defined (KERNEL_FILE) && defined (hpux) |
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241 # define KERNEL_FILE "/hp-ux" |
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242 # endif |
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244 # if !defined (KERNEL_FILE) && (defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi)) |
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245 # define KERNEL_FILE "/unix" |
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246 # endif |
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| 248 | |
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249 # if !defined (LDAV_SYMBOL) && (defined (hpux) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (_AIX) && !defined(HAVE_LIBPERFSTAT))) |
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250 # define LDAV_SYMBOL "avenrun" |
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251 # endif |
| 584 | 252 |
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253 # ifdef HAVE_UNISTD_H |
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254 # include <unistd.h> |
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255 # endif |
| 584 | 256 |
| 257 /* LOAD_AVE_TYPE should only get defined if we're going to use the | |
| 258 nlist method. */ | |
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259 # if !defined (LOAD_AVE_TYPE) && (defined (BSD) || defined (LDAV_CVT) || defined (KERNEL_FILE) || defined (LDAV_SYMBOL)) |
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260 # define LOAD_AVE_TYPE double |
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261 # endif |
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263 # ifdef LOAD_AVE_TYPE |
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265 # ifndef __VMS |
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266 # if !(defined __linux__ || defined __ANDROID__) |
| 2609 | 267 # ifndef NLIST_STRUCT |
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268 # include <a.out.h> |
| 2609 | 269 # else /* NLIST_STRUCT */ |
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270 # include <nlist.h> |
| 2609 | 271 # endif /* NLIST_STRUCT */ |
| 584 | 272 |
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273 # ifdef SUNOS_5 |
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274 # include <kvm.h> |
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275 # include <kstat.h> |
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276 # endif |
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278 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
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279 # include <sys/pstat.h> |
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280 # endif |
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282 # ifndef KERNEL_FILE |
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283 # define KERNEL_FILE "/vmunix" |
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284 # endif /* KERNEL_FILE */ |
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286 # ifndef LDAV_SYMBOL |
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287 # define LDAV_SYMBOL "_avenrun" |
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288 # endif /* LDAV_SYMBOL */ |
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289 # endif /* __linux__ || __ANDROID__ */ |
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291 # else /* __VMS */ |
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293 # ifndef eunice |
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294 # include <iodef.h> |
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295 # include <descrip.h> |
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296 # else /* eunice */ |
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297 # include <vms/iodef.h> |
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298 # endif /* eunice */ |
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299 # endif /* __VMS */ |
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301 # ifndef LDAV_CVT |
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302 # define LDAV_CVT(n) ((double) (n)) |
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303 # endif /* !LDAV_CVT */ |
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305 # endif /* LOAD_AVE_TYPE */ |
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306 |
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307 # if defined HAVE_LIBPERFSTAT |
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308 # include <sys/protosw.h> |
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309 # include <libperfstat.h> |
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310 # include <sys/proc.h> |
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311 # ifndef SBITS |
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312 # define SBITS 16 |
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313 # endif |
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314 # endif |
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316 # if defined (__GNU__) && !defined (NeXT) |
| 986 | 317 /* Note that NeXT Openstep defines __GNU__ even though it should not. */ |
| 318 /* GNU system acts much like NeXT, for load average purposes, | |
| 319 but not exactly. */ | |
| 320 # define NeXT | |
| 321 # define host_self mach_host_self | |
| 322 # endif | |
| 323 | |
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324 # ifdef NeXT |
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325 # ifdef HAVE_MACH_MACH_H |
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326 # include <mach/mach.h> |
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327 # else |
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328 # include <mach.h> |
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329 # endif |
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330 # endif /* NeXT */ |
| 584 | 331 |
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332 # ifdef sgi |
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333 # include <sys/sysmp.h> |
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334 # endif /* sgi */ |
| 584 | 335 |
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336 # ifdef UMAX |
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337 # include <signal.h> |
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338 # include <sys/time.h> |
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339 # include <sys/wait.h> |
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340 # include <sys/syscall.h> |
| 584 | 341 |
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342 # ifdef UMAX_43 |
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343 # include <machine/cpu.h> |
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344 # include <inq_stats/statistics.h> |
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345 # include <inq_stats/sysstats.h> |
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346 # include <inq_stats/cpustats.h> |
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347 # include <inq_stats/procstats.h> |
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348 # else /* Not UMAX_43. */ |
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349 # include <sys/sysdefs.h> |
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350 # include <sys/statistics.h> |
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351 # include <sys/sysstats.h> |
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352 # include <sys/cpudefs.h> |
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353 # include <sys/cpustats.h> |
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354 # include <sys/procstats.h> |
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355 # endif /* Not UMAX_43. */ |
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356 # endif /* UMAX */ |
| 584 | 357 |
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358 # ifdef DGUX |
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359 # include <sys/dg_sys_info.h> |
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360 # endif |
| 584 | 361 |
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362 # if (defined __linux__ || defined __ANDROID__ \ |
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363 || defined __CYGWIN__ || defined SUNOS_5 \ |
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364 || (defined LOAD_AVE_TYPE && ! defined __VMS)) |
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365 # include <fcntl.h> |
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366 # endif |
| 584 | 367 |
| 368 /* Avoid static vars inside a function since in HPUX they dump as pure. */ | |
| 369 | |
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370 # ifdef NeXT |
| 584 | 371 static processor_set_t default_set; |
| 5159 | 372 static bool getloadavg_initialized; |
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373 # endif /* NeXT */ |
| 584 | 374 |
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375 # ifdef UMAX |
| 584 | 376 static unsigned int cpus = 0; |
| 377 static unsigned int samples; | |
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378 # endif /* UMAX */ |
| 584 | 379 |
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380 # ifdef DGUX |
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381 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ |
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382 # endif /* DGUX */ |
| 584 | 383 |
| 4704 | 384 # if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE) |
| 584 | 385 /* File descriptor open to /dev/kmem or VMS load ave driver. */ |
| 386 static int channel; | |
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387 /* True if channel is valid. */ |
| 5159 | 388 static bool getloadavg_initialized; |
| 584 | 389 /* Offset in kmem to seek to read load average, or 0 means invalid. */ |
| 390 static long offset; | |
| 391 | |
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392 # if ! defined __VMS && ! defined sgi && ! (defined __linux__ || defined __ANDROID__) |
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393 static struct nlist name_list[2]; |
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394 # endif |
| 584 | 395 |
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396 # ifdef SUNOS_5 |
| 584 | 397 static kvm_t *kd; |
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398 # endif /* SUNOS_5 */ |
| 584 | 399 |
| 4704 | 400 # endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ |
| 584 | 401 |
| 402 /* Put the 1 minute, 5 minute and 15 minute load averages | |
| 403 into the first NELEM elements of LOADAVG. | |
| 404 Return the number written (never more than 3, but may be less than NELEM), | |
| 14355 | 405 or -1 (setting errno) if an error occurred. */ |
| 584 | 406 |
| 407 int | |
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408 getloadavg (double loadavg[], int nelem) |
| 584 | 409 { |
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410 int elem = 0; /* Return value. */ |
| 584 | 411 |
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412 # ifdef NO_GET_LOAD_AVG |
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413 # define LDAV_DONE |
| 14355 | 414 errno = ENOSYS; |
| 584 | 415 elem = -1; |
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416 # endif |
| 584 | 417 |
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418 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) /* Solaris <= 2.6 */ |
| 694 | 419 /* Use libkstat because we don't have to be root. */ |
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420 # define LDAV_DONE |
| 694 | 421 kstat_ctl_t *kc; |
| 422 kstat_t *ksp; | |
| 423 kstat_named_t *kn; | |
| 14355 | 424 int saved_errno; |
| 694 | 425 |
| 426 kc = kstat_open (); | |
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427 if (kc == NULL) |
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428 return -1; |
| 694 | 429 ksp = kstat_lookup (kc, "unix", 0, "system_misc"); |
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430 if (ksp == NULL) |
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431 return -1; |
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432 if (kstat_read (kc, ksp, 0) == -1) |
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433 return -1; |
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434 |
| 694 | 435 |
| 436 kn = kstat_data_lookup (ksp, "avenrun_1min"); | |
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437 if (kn == NULL) |
| 694 | 438 { |
| 439 /* Return -1 if no load average information is available. */ | |
| 440 nelem = 0; | |
| 441 elem = -1; | |
| 442 } | |
| 443 | |
| 444 if (nelem >= 1) | |
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445 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 694 | 446 |
| 447 if (nelem >= 2) | |
| 448 { | |
| 449 kn = kstat_data_lookup (ksp, "avenrun_5min"); | |
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450 if (kn != NULL) |
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451 { |
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452 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
| 694 | 453 |
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454 if (nelem >= 3) |
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455 { |
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456 kn = kstat_data_lookup (ksp, "avenrun_15min"); |
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457 if (kn != NULL) |
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458 loadavg[elem++] = (double) kn->value.ul / FSCALE; |
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459 } |
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460 } |
| 694 | 461 } |
| 462 | |
| 14355 | 463 saved_errno = errno; |
| 694 | 464 kstat_close (kc); |
| 14355 | 465 errno = saved_errno; |
| 986 | 466 # endif /* HAVE_LIBKSTAT */ |
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467 |
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468 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) |
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469 /* HP-UX */ |
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470 /* Use pstat_getdynamic() because we don't have to be root. */ |
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471 # define LDAV_DONE |
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472 # undef LOAD_AVE_TYPE |
| 694 | 473 |
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474 struct pst_dynamic dyn_info; |
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475 if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0) |
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476 return -1; |
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477 if (nelem > 0) |
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478 loadavg[elem++] = dyn_info.psd_avg_1_min; |
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479 if (nelem > 1) |
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480 loadavg[elem++] = dyn_info.psd_avg_5_min; |
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481 if (nelem > 2) |
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482 loadavg[elem++] = dyn_info.psd_avg_15_min; |
| 584 | 483 |
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484 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ |
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485 |
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486 # if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT /* AIX */ |
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487 # define LDAV_DONE |
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488 # undef LOAD_AVE_TYPE |
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489 /* Use perfstat_cpu_total because we don't have to be root. */ |
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490 { |
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491 perfstat_cpu_total_t cpu_stats; |
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492 int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1); |
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493 if (result == -1) |
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494 return result; |
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495 loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS); |
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496 loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS); |
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497 loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS); |
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498 elem = 3; |
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499 } |
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500 # endif |
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501 |
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502 # if !defined (LDAV_DONE) && (defined __linux__ || defined __ANDROID__ || defined __CYGWIN__) |
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503 /* Linux without glibc, Android, Cygwin */ |
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504 # define LDAV_DONE |
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505 # undef LOAD_AVE_TYPE |
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506 |
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507 # ifndef LINUX_LDAV_FILE |
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508 # define LINUX_LDAV_FILE "/proc/loadavg" |
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509 # endif |
| 584 | 510 |
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511 char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")]; |
| 5159 | 512 char const *ptr = ldavgbuf; |
| 14355 | 513 int fd, count, saved_errno; |
| 584 | 514 |
| 515 fd = open (LINUX_LDAV_FILE, O_RDONLY); | |
| 516 if (fd == -1) | |
| 517 return -1; | |
| 5159 | 518 count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); |
| 14355 | 519 saved_errno = errno; |
| 584 | 520 (void) close (fd); |
| 14355 | 521 errno = saved_errno; |
| 584 | 522 if (count <= 0) |
| 523 return -1; | |
| 5159 | 524 ldavgbuf[count] = '\0'; |
| 584 | 525 |
| 5159 | 526 for (elem = 0; elem < nelem; elem++) |
| 527 { | |
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528 double numerator = 0; |
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529 double denominator = 1; |
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530 |
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531 while (*ptr == ' ') |
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532 ptr++; |
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533 |
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534 /* Finish if this number is missing, and report an error if all |
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535 were missing. */ |
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536 if (! ('0' <= *ptr && *ptr <= '9')) |
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537 { |
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538 if (elem == 0) |
| 14355 | 539 { |
| 540 errno = ENOTSUP; | |
| 541 return -1; | |
| 542 } | |
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543 break; |
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544 } |
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545 |
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546 while ('0' <= *ptr && *ptr <= '9') |
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547 numerator = 10 * numerator + (*ptr++ - '0'); |
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548 |
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549 if (*ptr == '.') |
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550 for (ptr++; '0' <= *ptr && *ptr <= '9'; ptr++) |
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551 numerator = 10 * numerator + (*ptr - '0'), denominator *= 10; |
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552 |
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553 loadavg[elem++] = numerator / denominator; |
| 5159 | 554 } |
| 584 | 555 |
| 556 return elem; | |
| 557 | |
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558 # endif /* __linux__ || __ANDROID__ || __CYGWIN__ */ |
| 584 | 559 |
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560 # if !defined (LDAV_DONE) && defined (__NetBSD__) /* NetBSD < 0.9 */ |
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561 # define LDAV_DONE |
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562 # undef LOAD_AVE_TYPE |
| 584 | 563 |
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564 # ifndef NETBSD_LDAV_FILE |
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565 # define NETBSD_LDAV_FILE "/kern/loadavg" |
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566 # endif |
| 584 | 567 |
| 568 unsigned long int load_ave[3], scale; | |
| 569 int count; | |
| 570 FILE *fp; | |
| 571 | |
| 572 fp = fopen (NETBSD_LDAV_FILE, "r"); | |
| 573 if (fp == NULL) | |
| 574 return -1; | |
| 575 count = fscanf (fp, "%lu %lu %lu %lu\n", | |
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576 &load_ave[0], &load_ave[1], &load_ave[2], |
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577 &scale); |
| 584 | 578 (void) fclose (fp); |
| 579 if (count != 4) | |
| 14355 | 580 { |
| 581 errno = ENOTSUP; | |
| 582 return -1; | |
| 583 } | |
| 584 | 584 |
| 585 for (elem = 0; elem < nelem; elem++) | |
| 586 loadavg[elem] = (double) load_ave[elem] / (double) scale; | |
| 587 | |
| 588 return elem; | |
| 589 | |
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590 # endif /* __NetBSD__ */ |
| 584 | 591 |
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592 # if !defined (LDAV_DONE) && defined (NeXT) /* NeXTStep */ |
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593 # define LDAV_DONE |
| 584 | 594 /* The NeXT code was adapted from iscreen 3.2. */ |
| 595 | |
| 596 host_t host; | |
| 597 struct processor_set_basic_info info; | |
| 5159 | 598 unsigned int info_count; |
| 584 | 599 |
| 600 /* We only know how to get the 1-minute average for this system, | |
| 601 so even if the caller asks for more than 1, we only return 1. */ | |
| 602 | |
| 603 if (!getloadavg_initialized) | |
| 604 { | |
| 605 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) | |
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606 getloadavg_initialized = true; |
| 584 | 607 } |
| 608 | |
| 609 if (getloadavg_initialized) | |
| 610 { | |
| 611 info_count = PROCESSOR_SET_BASIC_INFO_COUNT; | |
| 612 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, | |
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613 (processor_set_info_t) &info, &info_count) |
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614 != KERN_SUCCESS) |
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615 getloadavg_initialized = false; |
| 584 | 616 else |
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617 { |
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618 if (nelem > 0) |
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619 loadavg[elem++] = (double) info.load_average / LOAD_SCALE; |
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620 } |
| 584 | 621 } |
| 622 | |
| 623 if (!getloadavg_initialized) | |
| 14355 | 624 { |
| 625 errno = ENOTSUP; | |
| 626 return -1; | |
| 627 } | |
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628 # endif /* NeXT */ |
| 584 | 629 |
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630 # if !defined (LDAV_DONE) && defined (UMAX) |
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631 # define LDAV_DONE |
| 584 | 632 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not |
| 633 have a /dev/kmem. Information about the workings of the running kernel | |
| 634 can be gathered with inq_stats system calls. | |
| 635 We only know how to get the 1-minute average for this system. */ | |
| 636 | |
| 637 struct proc_summary proc_sum_data; | |
| 638 struct stat_descr proc_info; | |
| 639 double load; | |
| 640 register unsigned int i, j; | |
| 641 | |
| 642 if (cpus == 0) | |
| 643 { | |
| 644 register unsigned int c, i; | |
| 645 struct cpu_config conf; | |
| 646 struct stat_descr desc; | |
| 647 | |
| 648 desc.sd_next = 0; | |
| 649 desc.sd_subsys = SUBSYS_CPU; | |
| 650 desc.sd_type = CPUTYPE_CONFIG; | |
| 651 desc.sd_addr = (char *) &conf; | |
| 652 desc.sd_size = sizeof conf; | |
| 653 | |
| 654 if (inq_stats (1, &desc)) | |
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655 return -1; |
| 584 | 656 |
| 657 c = 0; | |
| 658 for (i = 0; i < conf.config_maxclass; ++i) | |
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659 { |
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660 struct class_stats stats; |
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661 memset (&stats, 0, sizeof stats); |
| 584 | 662 |
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663 desc.sd_type = CPUTYPE_CLASS; |
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664 desc.sd_objid = i; |
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665 desc.sd_addr = (char *) &stats; |
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666 desc.sd_size = sizeof stats; |
| 584 | 667 |
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668 if (inq_stats (1, &desc)) |
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669 return -1; |
| 584 | 670 |
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671 c += stats.class_numcpus; |
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672 } |
| 584 | 673 cpus = c; |
| 674 samples = cpus < 2 ? 3 : (2 * cpus / 3); | |
| 675 } | |
| 676 | |
| 677 proc_info.sd_next = 0; | |
| 678 proc_info.sd_subsys = SUBSYS_PROC; | |
| 679 proc_info.sd_type = PROCTYPE_SUMMARY; | |
| 680 proc_info.sd_addr = (char *) &proc_sum_data; | |
| 681 proc_info.sd_size = sizeof (struct proc_summary); | |
| 682 proc_info.sd_sizeused = 0; | |
| 683 | |
| 684 if (inq_stats (1, &proc_info) != 0) | |
| 685 return -1; | |
| 686 | |
| 687 load = proc_sum_data.ps_nrunnable; | |
| 688 j = 0; | |
| 689 for (i = samples - 1; i > 0; --i) | |
| 690 { | |
| 691 load += proc_sum_data.ps_nrun[j]; | |
| 692 if (j++ == PS_NRUNSIZE) | |
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693 j = 0; |
| 584 | 694 } |
| 695 | |
| 696 if (nelem > 0) | |
| 697 loadavg[elem++] = load / samples / cpus; | |
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698 # endif /* UMAX */ |
| 584 | 699 |
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700 # if !defined (LDAV_DONE) && defined (DGUX) |
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701 # define LDAV_DONE |
| 584 | 702 /* This call can return -1 for an error, but with good args |
| 703 it's not supposed to fail. The first argument is for no | |
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704 apparent reason of type 'long int *'. */ |
| 584 | 705 dg_sys_info ((long int *) &load_info, |
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706 DG_SYS_INFO_LOAD_INFO_TYPE, |
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707 DG_SYS_INFO_LOAD_VERSION_0); |
| 584 | 708 |
| 709 if (nelem > 0) | |
| 710 loadavg[elem++] = load_info.one_minute; | |
| 711 if (nelem > 1) | |
| 712 loadavg[elem++] = load_info.five_minute; | |
| 713 if (nelem > 2) | |
| 714 loadavg[elem++] = load_info.fifteen_minute; | |
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715 # endif /* DGUX */ |
| 584 | 716 |
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717 # if !defined (LDAV_DONE) && defined (apollo) |
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718 # define LDAV_DONE |
| 584 | 719 /* Apollo code from lisch@mentorg.com (Ray Lischner). |
| 720 | |
| 721 This system call is not documented. The load average is obtained as | |
| 722 three long integers, for the load average over the past minute, | |
| 723 five minutes, and fifteen minutes. Each value is a scaled integer, | |
| 724 with 16 bits of integer part and 16 bits of fraction part. | |
| 725 | |
| 726 I'm not sure which operating system first supported this system call, | |
| 727 but I know that SR10.2 supports it. */ | |
| 728 | |
| 729 extern void proc1_$get_loadav (); | |
| 730 unsigned long load_ave[3]; | |
| 731 | |
| 732 proc1_$get_loadav (load_ave); | |
| 733 | |
| 734 if (nelem > 0) | |
| 735 loadavg[elem++] = load_ave[0] / 65536.0; | |
| 736 if (nelem > 1) | |
| 737 loadavg[elem++] = load_ave[1] / 65536.0; | |
| 738 if (nelem > 2) | |
| 739 loadavg[elem++] = load_ave[2] / 65536.0; | |
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740 # endif /* apollo */ |
| 584 | 741 |
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742 # if !defined (LDAV_DONE) && defined (OSF_MIPS) |
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743 # define LDAV_DONE |
| 584 | 744 |
| 745 struct tbl_loadavg load_ave; | |
| 746 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 747 loadavg[elem++] | |
| 748 = (load_ave.tl_lscale == 0 | |
| 749 ? load_ave.tl_avenrun.d[0] | |
| 750 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); | |
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751 # endif /* OSF_MIPS */ |
| 584 | 752 |
| 986 | 753 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32)) |
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754 /* DJGPP */ |
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755 # define LDAV_DONE |
| 584 | 756 |
| 757 /* A faithful emulation is going to have to be saved for a rainy day. */ | |
| 694 | 758 for ( ; elem < nelem; elem++) |
| 584 | 759 { |
| 760 loadavg[elem] = 0.0; | |
| 761 } | |
| 986 | 762 # endif /* __MSDOS__ || WINDOWS32 */ |
| 584 | 763 |
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764 # if !defined (LDAV_DONE) && defined (OSF_ALPHA) /* OSF/1 */ |
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765 # define LDAV_DONE |
| 584 | 766 |
| 767 struct tbl_loadavg load_ave; | |
| 768 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); | |
| 769 for (elem = 0; elem < nelem; elem++) | |
| 770 loadavg[elem] | |
| 771 = (load_ave.tl_lscale == 0 | |
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772 ? load_ave.tl_avenrun.d[elem] |
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773 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale)); |
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774 # endif /* OSF_ALPHA */ |
| 584 | 775 |
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776 # if ! defined LDAV_DONE && defined __VMS /* VMS */ |
| 584 | 777 /* VMS specific code -- read from the Load Ave driver. */ |
| 778 | |
| 779 LOAD_AVE_TYPE load_ave[3]; | |
| 5159 | 780 static bool getloadavg_initialized; |
|
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781 # ifdef eunice |
| 584 | 782 struct |
| 783 { | |
| 784 int dsc$w_length; | |
| 785 char *dsc$a_pointer; | |
| 786 } descriptor; | |
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787 # endif |
| 584 | 788 |
| 789 /* Ensure that there is a channel open to the load ave device. */ | |
| 790 if (!getloadavg_initialized) | |
| 791 { | |
| 792 /* Attempt to open the channel. */ | |
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793 # ifdef eunice |
| 584 | 794 descriptor.dsc$w_length = 18; |
| 795 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; | |
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796 # else |
| 584 | 797 $DESCRIPTOR (descriptor, "LAV0:"); |
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798 # endif |
| 584 | 799 if (sys$assign (&descriptor, &channel, 0, 0) & 1) |
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800 getloadavg_initialized = true; |
| 584 | 801 } |
| 802 | |
| 803 /* Read the load average vector. */ | |
| 804 if (getloadavg_initialized | |
| 805 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, | |
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806 load_ave, 12, 0, 0, 0, 0) & 1)) |
| 584 | 807 { |
| 808 sys$dassgn (channel); | |
| 5159 | 809 getloadavg_initialized = false; |
| 584 | 810 } |
| 811 | |
| 812 if (!getloadavg_initialized) | |
| 14355 | 813 { |
| 814 errno = ENOTSUP; | |
| 815 return -1; | |
| 816 } | |
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817 # endif /* ! defined LDAV_DONE && defined __VMS */ |
| 584 | 818 |
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819 # if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS |
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820 /* IRIX, other old systems */ |
| 584 | 821 |
| 822 /* UNIX-specific code -- read the average from /dev/kmem. */ | |
| 823 | |
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824 # define LDAV_PRIVILEGED /* This code requires special installation. */ |
| 584 | 825 |
| 826 LOAD_AVE_TYPE load_ave[3]; | |
| 827 | |
| 828 /* Get the address of LDAV_SYMBOL. */ | |
| 829 if (offset == 0) | |
| 830 { | |
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831 # ifndef sgi |
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832 # if ! defined NLIST_STRUCT || ! defined N_NAME_POINTER |
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833 strcpy (name_list[0].n_name, LDAV_SYMBOL); |
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834 strcpy (name_list[1].n_name, ""); |
| 2609 | 835 # else /* NLIST_STRUCT */ |
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836 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME |
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837 name_list[0].n_un.n_name = LDAV_SYMBOL; |
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838 name_list[1].n_un.n_name = 0; |
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839 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
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840 name_list[0].n_name = LDAV_SYMBOL; |
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841 name_list[1].n_name = 0; |
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842 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ |
| 2609 | 843 # endif /* NLIST_STRUCT */ |
| 584 | 844 |
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845 # ifndef SUNOS_5 |
| 584 | 846 if ( |
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847 # if !defined (_AIX) |
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848 nlist (KERNEL_FILE, name_list) |
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849 # else /* _AIX */ |
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850 knlist (name_list, 1, sizeof (name_list[0])) |
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851 # endif |
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852 >= 0) |
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853 /* Omit "&& name_list[0].n_type != 0 " -- it breaks on Sun386i. */ |
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854 { |
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855 # ifdef FIXUP_KERNEL_SYMBOL_ADDR |
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856 FIXUP_KERNEL_SYMBOL_ADDR (name_list); |
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857 # endif |
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858 offset = name_list[0].n_value; |
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859 } |
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860 # endif /* !SUNOS_5 */ |
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861 # else /* sgi */ |
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862 ptrdiff_t ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); |
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863 if (ldav_off != -1) |
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864 offset = (long int) ldav_off & 0x7fffffff; |
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865 # endif /* sgi */ |
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866 } |
| 584 | 867 |
| 868 /* Make sure we have /dev/kmem open. */ | |
| 869 if (!getloadavg_initialized) | |
| 870 { | |
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871 # ifndef SUNOS_5 |
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872 /* Set the channel to close on exec, so it does not |
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873 litter any child's descriptor table. */ |
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874 # ifndef O_CLOEXEC |
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875 # define O_CLOEXEC 0 |
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876 # endif |
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877 int fd = open ("/dev/kmem", O_RDONLY | O_CLOEXEC); |
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878 if (0 <= fd) |
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879 { |
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880 # if F_DUPFD_CLOEXEC |
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881 if (fd <= STDERR_FILENO) |
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882 { |
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883 int fd1 = fcntl (fd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1); |
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884 close (fd); |
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885 fd = fd1; |
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886 } |
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887 # endif |
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888 if (0 <= fd) |
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889 { |
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890 channel = fd; |
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891 getloadavg_initialized = true; |
|
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892 } |
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893 } |
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894 # else /* SUNOS_5 */ |
| 584 | 895 /* We pass 0 for the kernel, corefile, and swapfile names |
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896 to use the currently running kernel. */ |
| 584 | 897 kd = kvm_open (0, 0, 0, O_RDONLY, 0); |
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898 if (kd != NULL) |
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899 { |
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900 /* nlist the currently running kernel. */ |
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901 kvm_nlist (kd, name_list); |
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902 offset = name_list[0].n_value; |
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903 getloadavg_initialized = true; |
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904 } |
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905 # endif /* SUNOS_5 */ |
| 584 | 906 } |
| 907 | |
| 908 /* If we can, get the load average values. */ | |
| 909 if (offset && getloadavg_initialized) | |
| 910 { | |
| 911 /* Try to read the load. */ | |
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912 # ifndef SUNOS_5 |
| 584 | 913 if (lseek (channel, offset, 0) == -1L |
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914 || read (channel, (char *) load_ave, sizeof (load_ave)) |
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915 != sizeof (load_ave)) |
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916 { |
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917 close (channel); |
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918 getloadavg_initialized = false; |
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919 } |
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920 # else /* SUNOS_5 */ |
| 584 | 921 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) |
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922 != sizeof (load_ave)) |
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923 { |
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924 kvm_close (kd); |
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925 getloadavg_initialized = false; |
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926 } |
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927 # endif /* SUNOS_5 */ |
| 584 | 928 } |
| 929 | |
| 930 if (offset == 0 || !getloadavg_initialized) | |
| 14355 | 931 { |
| 932 errno = ENOTSUP; | |
| 933 return -1; | |
| 934 } | |
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935 # endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ |
| 584 | 936 |
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937 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ |
| 584 | 938 if (nelem > 0) |
| 939 loadavg[elem++] = LDAV_CVT (load_ave[0]); | |
| 940 if (nelem > 1) | |
| 941 loadavg[elem++] = LDAV_CVT (load_ave[1]); | |
| 942 if (nelem > 2) | |
| 943 loadavg[elem++] = LDAV_CVT (load_ave[2]); | |
| 944 | |
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945 # define LDAV_DONE |
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946 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */ |
| 584 | 947 |
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948 # if !defined LDAV_DONE |
| 14355 | 949 errno = ENOSYS; |
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950 elem = -1; |
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951 # endif |
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952 return elem; |
| 584 | 953 } |