1035 lines
26 KiB
C
1035 lines
26 KiB
C
/* Get the system load averages.
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Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995, 1997
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Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA. */
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/* Compile-time symbols that this file uses:
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HAVE_PSTAT_GETDYNAMIC Define this if your system has the
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pstat_getdynamic function. I think it
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is unique to HPUX9. The best way to get the
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definition is through the AC_FUNC_GETLOADAVG
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macro that comes with autoconf 2.13 or newer.
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If that isn't an option, then just put
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AC_CHECK_FUNCS(pstat_getdynamic) in your
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configure.in file.
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FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
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KERNEL_FILE Pathname of the kernel to nlist.
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LDAV_CVT() Scale the load average from the kernel.
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Returns a double.
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LDAV_SYMBOL Name of kernel symbol giving load average.
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LOAD_AVE_TYPE Type of the load average array in the kernel.
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Must be defined unless one of
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apollo, DGUX, NeXT, or UMAX is defined;
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or we have libkstat;
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otherwise, no load average is available.
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NLIST_STRUCT Include nlist.h, not a.out.h, and
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the nlist n_name element is a pointer,
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not an array.
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HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
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LINUX_LDAV_FILE [__linux__]: File containing load averages.
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Specific system predefines this file uses, aside from setting
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default values if not emacs:
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apollo
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BSD Real BSD, not just BSD-like.
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convex
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DGUX
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eunice UNIX emulator under VMS.
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hpux
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__MSDOS__ No-op for MSDOS.
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NeXT
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sgi
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sequent Sequent Dynix 3.x.x (BSD)
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_SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
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sony_news NEWS-OS (works at least for 4.1C)
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UMAX
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UMAX4_3
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VMS
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WINDOWS32 No-op for Windows95/NT.
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__linux__ Linux: assumes /proc filesystem mounted.
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Support from Michael K. Johnson.
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__NetBSD__ NetBSD: assumes /kern filesystem mounted.
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In addition, to avoid nesting many #ifdefs, we internally set
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LDAV_DONE to indicate that the load average has been computed.
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We also #define LDAV_PRIVILEGED if a program will require
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special installation to be able to call getloadavg. */
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/* This should always be first. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <sys/types.h>
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/* Both the Emacs and non-Emacs sections want this. Some
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configuration files' definitions for the LOAD_AVE_CVT macro (like
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sparc.h's) use macros like FSCALE, defined here. */
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#if defined (unix) || defined (__unix)
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# include <sys/param.h>
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#endif
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/* Exclude all the code except the test program at the end
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if the system has its own `getloadavg' function.
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The declaration of `errno' is needed by the test program
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as well as the function itself, so it comes first. */
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#if HAVE_LOCALE_H
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# include <locale.h>
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#endif
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#if !HAVE_SETLOCALE
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# define setlocale(Category, Locale) /* empty */
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#endif
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#ifndef HAVE_GETLOADAVG
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/* The existing Emacs configuration files define a macro called
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LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
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returns the load average multiplied by 100. What we actually want
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is a macro called LDAV_CVT, which returns the load average as an
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unmultiplied double.
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For backwards compatibility, we'll define LDAV_CVT in terms of
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LOAD_AVE_CVT, but future machine config files should just define
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LDAV_CVT directly. */
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# if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
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# define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
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# endif
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# if !defined (BSD) && defined (ultrix)
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/* Ultrix behaves like BSD on Vaxen. */
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# define BSD
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# endif
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# ifdef NeXT
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/* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
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conflicts with the definition understood in this file, that this
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really is BSD. */
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# undef BSD
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/* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
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defined to mean that the nlist method should be used, which is not true. */
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# undef FSCALE
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# endif
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/* Same issues as for NeXT apply to the HURD-based GNU system. */
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# ifdef __GNU__
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# undef BSD
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# undef FSCALE
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# endif /* __GNU__ */
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/* Set values that are different from the defaults, which are
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set a little farther down with #ifndef. */
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/* Some shorthands. */
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# if defined (HPUX) && !defined (hpux)
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# define hpux
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# endif
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# if defined (__hpux) && !defined (hpux)
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# define hpux
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# endif
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# if defined (__sun) && !defined (sun)
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# define sun
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# endif
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# if defined(hp300) && !defined(hpux)
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# define MORE_BSD
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# endif
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# if defined(ultrix) && defined(mips)
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# define decstation
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# endif
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# if defined (__SVR4) && !defined (SVR4)
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# define SVR4
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# endif
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# if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
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# define SUNOS_5
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# endif
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# if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
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# define OSF_ALPHA
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# include <sys/mbuf.h>
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# include <sys/socket.h>
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# include <net/route.h>
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# include <sys/table.h>
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# endif
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# if defined (__osf__) && (defined (mips) || defined (__mips__))
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# define OSF_MIPS
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# include <sys/table.h>
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# endif
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/* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
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default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
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that with a couple of other things and we'll have a unique match. */
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# if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
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# define tek4300 /* Define by emacs, but not by other users. */
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# endif
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/* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
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# if defined(__QNX__)
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# undef SVR4
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# endif
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/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
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# ifndef LOAD_AVE_TYPE
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# ifdef MORE_BSD
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef sun
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef decstation
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef _SEQUENT_
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef sgi
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef SVR4
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef sony_news
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef sequent
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef OSF_ALPHA
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# define LOAD_AVE_TYPE long
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# endif
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# if defined (ardent) && defined (titan)
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef tek4300
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# define LOAD_AVE_TYPE long
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# endif
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# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef _AIX
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# define LOAD_AVE_TYPE long
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# endif
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# ifdef convex
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# define LOAD_AVE_TYPE double
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# ifndef LDAV_CVT
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# define LDAV_CVT(n) (n)
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# endif
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# endif
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# endif /* No LOAD_AVE_TYPE. */
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# ifdef OSF_ALPHA
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/* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
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according to ghazi@noc.rutgers.edu. */
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# undef FSCALE
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# define FSCALE 1024.0
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# endif
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# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
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/* <sys/param.h> defines an incorrect value for FSCALE on an
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Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
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# undef FSCALE
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# define FSCALE 100.0
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# endif
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# ifndef FSCALE
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/* SunOS and some others define FSCALE in sys/param.h. */
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# ifdef MORE_BSD
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# define FSCALE 2048.0
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# endif
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# if defined(MIPS) || defined(SVR4) || defined(decstation)
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# define FSCALE 256
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# endif
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# if defined (sgi) || defined (sequent)
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/* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
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above under #ifdef MIPS. But we want the sgi value. */
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# undef FSCALE
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# define FSCALE 1000.0
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# endif
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# if defined (ardent) && defined (titan)
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# define FSCALE 65536.0
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# endif
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# ifdef tek4300
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# define FSCALE 100.0
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# endif
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# ifdef _AIX
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# define FSCALE 65536.0
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# endif
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# endif /* Not FSCALE. */
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# if !defined (LDAV_CVT) && defined (FSCALE)
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# define LDAV_CVT(n) (((double) (n)) / FSCALE)
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# endif
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# if defined(sgi) || (defined(mips) && !defined(BSD))
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# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
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# endif
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# if !defined (KERNEL_FILE) && defined (sequent)
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# define KERNEL_FILE "/dynix"
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# endif
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# if !defined (KERNEL_FILE) && defined (hpux)
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# define KERNEL_FILE "/hp-ux"
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# endif
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# if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
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# define KERNEL_FILE "/unix"
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# endif
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# if !defined (LDAV_SYMBOL) && defined (alliant)
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# define LDAV_SYMBOL "_Loadavg"
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# endif
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# if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
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# define LDAV_SYMBOL "avenrun"
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# endif
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# ifdef HAVE_UNISTD_H
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# include <unistd.h>
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# endif
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# include <stdio.h>
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/* LOAD_AVE_TYPE should only get defined if we're going to use the
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nlist method. */
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# if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
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# define LOAD_AVE_TYPE double
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# endif
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# ifdef LOAD_AVE_TYPE
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# ifndef VMS
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# ifndef __linux__
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# ifdef HAVE_NLIST_H
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# include <nlist.h>
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# else
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# include <a.out.h>
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# endif
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|
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# ifdef SUNOS_5
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# include <fcntl.h>
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# include <kvm.h>
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# include <kstat.h>
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# endif
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# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
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# include <sys/pstat.h>
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# endif
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# ifndef KERNEL_FILE
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# define KERNEL_FILE "/vmunix"
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# endif /* KERNEL_FILE */
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# ifndef LDAV_SYMBOL
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# define LDAV_SYMBOL "_avenrun"
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# endif /* LDAV_SYMBOL */
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# endif /* __linux__ */
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||
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# else /* VMS */
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||
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||
# ifndef eunice
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# include <iodef.h>
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# include <descrip.h>
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# else /* eunice */
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# include <vms/iodef.h>
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# endif /* eunice */
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# endif /* VMS */
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|
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# ifndef LDAV_CVT
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# define LDAV_CVT(n) ((double) (n))
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# endif /* !LDAV_CVT */
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|
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# endif /* LOAD_AVE_TYPE */
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|
||
# if defined(__GNU__) && !defined (NeXT)
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||
/* Note that NeXT Openstep defines __GNU__ even though it should not. */
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/* GNU system acts much like NeXT, for load average purposes,
|
||
but not exactly. */
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# define NeXT
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||
# define host_self mach_host_self
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# endif
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||
|
||
# ifdef NeXT
|
||
# ifdef HAVE_MACH_MACH_H
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||
# include <mach/mach.h>
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# else
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||
# include <mach.h>
|
||
# endif
|
||
# endif /* NeXT */
|
||
|
||
# ifdef sgi
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||
# include <sys/sysmp.h>
|
||
# endif /* sgi */
|
||
|
||
# ifdef UMAX
|
||
# include <stdio.h>
|
||
# include <signal.h>
|
||
# include <sys/time.h>
|
||
# include <sys/wait.h>
|
||
# include <sys/syscall.h>
|
||
|
||
# ifdef UMAX_43
|
||
# include <machine/cpu.h>
|
||
# include <inq_stats/statistics.h>
|
||
# include <inq_stats/sysstats.h>
|
||
# include <inq_stats/cpustats.h>
|
||
# include <inq_stats/procstats.h>
|
||
# else /* Not UMAX_43. */
|
||
# include <sys/sysdefs.h>
|
||
# include <sys/statistics.h>
|
||
# include <sys/sysstats.h>
|
||
# include <sys/cpudefs.h>
|
||
# include <sys/cpustats.h>
|
||
# include <sys/procstats.h>
|
||
# endif /* Not UMAX_43. */
|
||
# endif /* UMAX */
|
||
|
||
# ifdef DGUX
|
||
# include <sys/dg_sys_info.h>
|
||
# endif
|
||
|
||
# if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
|
||
# include <fcntl.h>
|
||
# else
|
||
# include <sys/file.h>
|
||
# endif
|
||
|
||
|
||
/* Avoid static vars inside a function since in HPUX they dump as pure. */
|
||
|
||
# ifdef NeXT
|
||
static processor_set_t default_set;
|
||
static int getloadavg_initialized;
|
||
# endif /* NeXT */
|
||
|
||
# ifdef UMAX
|
||
static unsigned int cpus = 0;
|
||
static unsigned int samples;
|
||
# endif /* UMAX */
|
||
|
||
# ifdef DGUX
|
||
static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
|
||
# endif /* DGUX */
|
||
|
||
#if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
|
||
/* File descriptor open to /dev/kmem or VMS load ave driver. */
|
||
static int channel;
|
||
/* Nonzero iff channel is valid. */
|
||
static int getloadavg_initialized;
|
||
/* Offset in kmem to seek to read load average, or 0 means invalid. */
|
||
static long offset;
|
||
|
||
#if !defined(VMS) && !defined(sgi) && !defined(__linux__)
|
||
static struct nlist nl[2];
|
||
#endif /* Not VMS or sgi */
|
||
|
||
#ifdef SUNOS_5
|
||
static kvm_t *kd;
|
||
#endif /* SUNOS_5 */
|
||
|
||
#endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
|
||
|
||
/* Put the 1 minute, 5 minute and 15 minute load averages
|
||
into the first NELEM elements of LOADAVG.
|
||
Return the number written (never more than 3, but may be less than NELEM),
|
||
or -1 if an error occurred. */
|
||
|
||
int
|
||
getloadavg (loadavg, nelem)
|
||
double loadavg[];
|
||
int nelem;
|
||
{
|
||
int elem = 0; /* Return value. */
|
||
|
||
# ifdef NO_GET_LOAD_AVG
|
||
# define LDAV_DONE
|
||
/* Set errno to zero to indicate that there was no particular error;
|
||
this function just can't work at all on this system. */
|
||
errno = 0;
|
||
elem = -1;
|
||
# endif
|
||
|
||
# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
|
||
/* Use libkstat because we don't have to be root. */
|
||
# define LDAV_DONE
|
||
kstat_ctl_t *kc;
|
||
kstat_t *ksp;
|
||
kstat_named_t *kn;
|
||
|
||
kc = kstat_open ();
|
||
if (kc == 0)
|
||
return -1;
|
||
ksp = kstat_lookup (kc, "unix", 0, "system_misc");
|
||
if (ksp == 0 )
|
||
return -1;
|
||
if (kstat_read (kc, ksp, 0) == -1)
|
||
return -1;
|
||
|
||
|
||
kn = kstat_data_lookup (ksp, "avenrun_1min");
|
||
if (kn == 0)
|
||
{
|
||
/* Return -1 if no load average information is available. */
|
||
nelem = 0;
|
||
elem = -1;
|
||
}
|
||
|
||
if (nelem >= 1)
|
||
loadavg[elem++] = (double) kn->value.ul/FSCALE;
|
||
|
||
if (nelem >= 2)
|
||
{
|
||
kn = kstat_data_lookup (ksp, "avenrun_5min");
|
||
if (kn != 0)
|
||
{
|
||
loadavg[elem++] = (double) kn->value.ul/FSCALE;
|
||
|
||
if (nelem >= 3)
|
||
{
|
||
kn = kstat_data_lookup (ksp, "avenrun_15min");
|
||
if (kn != 0)
|
||
loadavg[elem++] = (double) kn->value.ul/FSCALE;
|
||
}
|
||
}
|
||
}
|
||
|
||
kstat_close (kc);
|
||
# endif /* HAVE_LIBKSTAT */
|
||
|
||
# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
|
||
/* Use pstat_getdynamic() because we don't have to be root. */
|
||
# define LDAV_DONE
|
||
# undef LOAD_AVE_TYPE
|
||
|
||
struct pst_dynamic dyn_info;
|
||
if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0)
|
||
return -1;
|
||
if (nelem > 0)
|
||
loadavg[elem++] = dyn_info.psd_avg_1_min;
|
||
if (nelem > 1)
|
||
loadavg[elem++] = dyn_info.psd_avg_5_min;
|
||
if (nelem > 2)
|
||
loadavg[elem++] = dyn_info.psd_avg_15_min;
|
||
|
||
# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
|
||
|
||
# if !defined (LDAV_DONE) && defined (__linux__)
|
||
# define LDAV_DONE
|
||
# undef LOAD_AVE_TYPE
|
||
|
||
# ifndef LINUX_LDAV_FILE
|
||
# define LINUX_LDAV_FILE "/proc/loadavg"
|
||
# endif
|
||
|
||
char ldavgbuf[40];
|
||
double load_ave[3];
|
||
int fd, count;
|
||
|
||
fd = open (LINUX_LDAV_FILE, O_RDONLY);
|
||
if (fd == -1)
|
||
return -1;
|
||
count = read (fd, ldavgbuf, 40);
|
||
(void) close (fd);
|
||
if (count <= 0)
|
||
return -1;
|
||
|
||
/* The following sscanf must use the C locale. */
|
||
setlocale (LC_NUMERIC, "C");
|
||
count = sscanf (ldavgbuf, "%lf %lf %lf",
|
||
&load_ave[0], &load_ave[1], &load_ave[2]);
|
||
setlocale (LC_NUMERIC, "");
|
||
if (count < 1)
|
||
return -1;
|
||
|
||
for (elem = 0; elem < nelem && elem < count; elem++)
|
||
loadavg[elem] = load_ave[elem];
|
||
|
||
return elem;
|
||
|
||
# endif /* __linux__ */
|
||
|
||
# if !defined (LDAV_DONE) && defined (__NetBSD__)
|
||
# define LDAV_DONE
|
||
# undef LOAD_AVE_TYPE
|
||
|
||
# ifndef NETBSD_LDAV_FILE
|
||
# define NETBSD_LDAV_FILE "/kern/loadavg"
|
||
# endif
|
||
|
||
unsigned long int load_ave[3], scale;
|
||
int count;
|
||
FILE *fp;
|
||
|
||
fp = fopen (NETBSD_LDAV_FILE, "r");
|
||
if (fp == NULL)
|
||
return -1;
|
||
count = fscanf (fp, "%lu %lu %lu %lu\n",
|
||
&load_ave[0], &load_ave[1], &load_ave[2],
|
||
&scale);
|
||
(void) fclose (fp);
|
||
if (count != 4)
|
||
return -1;
|
||
|
||
for (elem = 0; elem < nelem; elem++)
|
||
loadavg[elem] = (double) load_ave[elem] / (double) scale;
|
||
|
||
return elem;
|
||
|
||
# endif /* __NetBSD__ */
|
||
|
||
# if !defined (LDAV_DONE) && defined (NeXT)
|
||
# define LDAV_DONE
|
||
/* The NeXT code was adapted from iscreen 3.2. */
|
||
|
||
host_t host;
|
||
struct processor_set_basic_info info;
|
||
unsigned info_count;
|
||
|
||
/* We only know how to get the 1-minute average for this system,
|
||
so even if the caller asks for more than 1, we only return 1. */
|
||
|
||
if (!getloadavg_initialized)
|
||
{
|
||
if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
|
||
getloadavg_initialized = 1;
|
||
}
|
||
|
||
if (getloadavg_initialized)
|
||
{
|
||
info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
|
||
if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
|
||
(processor_set_info_t) &info, &info_count)
|
||
!= KERN_SUCCESS)
|
||
getloadavg_initialized = 0;
|
||
else
|
||
{
|
||
if (nelem > 0)
|
||
loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
|
||
}
|
||
}
|
||
|
||
if (!getloadavg_initialized)
|
||
return -1;
|
||
# endif /* NeXT */
|
||
|
||
# if !defined (LDAV_DONE) && defined (UMAX)
|
||
# define LDAV_DONE
|
||
/* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
|
||
have a /dev/kmem. Information about the workings of the running kernel
|
||
can be gathered with inq_stats system calls.
|
||
We only know how to get the 1-minute average for this system. */
|
||
|
||
struct proc_summary proc_sum_data;
|
||
struct stat_descr proc_info;
|
||
double load;
|
||
register unsigned int i, j;
|
||
|
||
if (cpus == 0)
|
||
{
|
||
register unsigned int c, i;
|
||
struct cpu_config conf;
|
||
struct stat_descr desc;
|
||
|
||
desc.sd_next = 0;
|
||
desc.sd_subsys = SUBSYS_CPU;
|
||
desc.sd_type = CPUTYPE_CONFIG;
|
||
desc.sd_addr = (char *) &conf;
|
||
desc.sd_size = sizeof conf;
|
||
|
||
if (inq_stats (1, &desc))
|
||
return -1;
|
||
|
||
c = 0;
|
||
for (i = 0; i < conf.config_maxclass; ++i)
|
||
{
|
||
struct class_stats stats;
|
||
bzero ((char *) &stats, sizeof stats);
|
||
|
||
desc.sd_type = CPUTYPE_CLASS;
|
||
desc.sd_objid = i;
|
||
desc.sd_addr = (char *) &stats;
|
||
desc.sd_size = sizeof stats;
|
||
|
||
if (inq_stats (1, &desc))
|
||
return -1;
|
||
|
||
c += stats.class_numcpus;
|
||
}
|
||
cpus = c;
|
||
samples = cpus < 2 ? 3 : (2 * cpus / 3);
|
||
}
|
||
|
||
proc_info.sd_next = 0;
|
||
proc_info.sd_subsys = SUBSYS_PROC;
|
||
proc_info.sd_type = PROCTYPE_SUMMARY;
|
||
proc_info.sd_addr = (char *) &proc_sum_data;
|
||
proc_info.sd_size = sizeof (struct proc_summary);
|
||
proc_info.sd_sizeused = 0;
|
||
|
||
if (inq_stats (1, &proc_info) != 0)
|
||
return -1;
|
||
|
||
load = proc_sum_data.ps_nrunnable;
|
||
j = 0;
|
||
for (i = samples - 1; i > 0; --i)
|
||
{
|
||
load += proc_sum_data.ps_nrun[j];
|
||
if (j++ == PS_NRUNSIZE)
|
||
j = 0;
|
||
}
|
||
|
||
if (nelem > 0)
|
||
loadavg[elem++] = load / samples / cpus;
|
||
# endif /* UMAX */
|
||
|
||
# if !defined (LDAV_DONE) && defined (DGUX)
|
||
# define LDAV_DONE
|
||
/* This call can return -1 for an error, but with good args
|
||
it's not supposed to fail. The first argument is for no
|
||
apparent reason of type `long int *'. */
|
||
dg_sys_info ((long int *) &load_info,
|
||
DG_SYS_INFO_LOAD_INFO_TYPE,
|
||
DG_SYS_INFO_LOAD_VERSION_0);
|
||
|
||
if (nelem > 0)
|
||
loadavg[elem++] = load_info.one_minute;
|
||
if (nelem > 1)
|
||
loadavg[elem++] = load_info.five_minute;
|
||
if (nelem > 2)
|
||
loadavg[elem++] = load_info.fifteen_minute;
|
||
# endif /* DGUX */
|
||
|
||
# if !defined (LDAV_DONE) && defined (apollo)
|
||
# define LDAV_DONE
|
||
/* Apollo code from lisch@mentorg.com (Ray Lischner).
|
||
|
||
This system call is not documented. The load average is obtained as
|
||
three long integers, for the load average over the past minute,
|
||
five minutes, and fifteen minutes. Each value is a scaled integer,
|
||
with 16 bits of integer part and 16 bits of fraction part.
|
||
|
||
I'm not sure which operating system first supported this system call,
|
||
but I know that SR10.2 supports it. */
|
||
|
||
extern void proc1_$get_loadav ();
|
||
unsigned long load_ave[3];
|
||
|
||
proc1_$get_loadav (load_ave);
|
||
|
||
if (nelem > 0)
|
||
loadavg[elem++] = load_ave[0] / 65536.0;
|
||
if (nelem > 1)
|
||
loadavg[elem++] = load_ave[1] / 65536.0;
|
||
if (nelem > 2)
|
||
loadavg[elem++] = load_ave[2] / 65536.0;
|
||
# endif /* apollo */
|
||
|
||
# if !defined (LDAV_DONE) && defined (OSF_MIPS)
|
||
# define LDAV_DONE
|
||
|
||
struct tbl_loadavg load_ave;
|
||
table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
|
||
loadavg[elem++]
|
||
= (load_ave.tl_lscale == 0
|
||
? load_ave.tl_avenrun.d[0]
|
||
: (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
|
||
# endif /* OSF_MIPS */
|
||
|
||
# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
|
||
# define LDAV_DONE
|
||
|
||
/* A faithful emulation is going to have to be saved for a rainy day. */
|
||
for ( ; elem < nelem; elem++)
|
||
{
|
||
loadavg[elem] = 0.0;
|
||
}
|
||
# endif /* __MSDOS__ || WINDOWS32 */
|
||
|
||
# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
|
||
# define LDAV_DONE
|
||
|
||
struct tbl_loadavg load_ave;
|
||
table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
|
||
for (elem = 0; elem < nelem; elem++)
|
||
loadavg[elem]
|
||
= (load_ave.tl_lscale == 0
|
||
? load_ave.tl_avenrun.d[elem]
|
||
: (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
|
||
# endif /* OSF_ALPHA */
|
||
|
||
# if !defined (LDAV_DONE) && defined (VMS)
|
||
/* VMS specific code -- read from the Load Ave driver. */
|
||
|
||
LOAD_AVE_TYPE load_ave[3];
|
||
static int getloadavg_initialized = 0;
|
||
# ifdef eunice
|
||
struct
|
||
{
|
||
int dsc$w_length;
|
||
char *dsc$a_pointer;
|
||
} descriptor;
|
||
# endif
|
||
|
||
/* Ensure that there is a channel open to the load ave device. */
|
||
if (!getloadavg_initialized)
|
||
{
|
||
/* Attempt to open the channel. */
|
||
# ifdef eunice
|
||
descriptor.dsc$w_length = 18;
|
||
descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
|
||
# else
|
||
$DESCRIPTOR (descriptor, "LAV0:");
|
||
# endif
|
||
if (sys$assign (&descriptor, &channel, 0, 0) & 1)
|
||
getloadavg_initialized = 1;
|
||
}
|
||
|
||
/* Read the load average vector. */
|
||
if (getloadavg_initialized
|
||
&& !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
|
||
load_ave, 12, 0, 0, 0, 0) & 1))
|
||
{
|
||
sys$dassgn (channel);
|
||
getloadavg_initialized = 0;
|
||
}
|
||
|
||
if (!getloadavg_initialized)
|
||
return -1;
|
||
# endif /* VMS */
|
||
|
||
# if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
|
||
|
||
/* UNIX-specific code -- read the average from /dev/kmem. */
|
||
|
||
# define LDAV_PRIVILEGED /* This code requires special installation. */
|
||
|
||
LOAD_AVE_TYPE load_ave[3];
|
||
|
||
/* Get the address of LDAV_SYMBOL. */
|
||
if (offset == 0)
|
||
{
|
||
# ifndef sgi
|
||
# ifndef NLIST_STRUCT
|
||
strcpy (nl[0].n_name, LDAV_SYMBOL);
|
||
strcpy (nl[1].n_name, "");
|
||
# else /* NLIST_STRUCT */
|
||
# ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
|
||
nl[0].n_un.n_name = LDAV_SYMBOL;
|
||
nl[1].n_un.n_name = 0;
|
||
# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
|
||
nl[0].n_name = LDAV_SYMBOL;
|
||
nl[1].n_name = 0;
|
||
# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
|
||
# endif /* NLIST_STRUCT */
|
||
|
||
# ifndef SUNOS_5
|
||
if (
|
||
# if !(defined (_AIX) && !defined (ps2))
|
||
nlist (KERNEL_FILE, nl)
|
||
# else /* _AIX */
|
||
knlist (nl, 1, sizeof (nl[0]))
|
||
# endif
|
||
>= 0)
|
||
/* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
|
||
{
|
||
# ifdef FIXUP_KERNEL_SYMBOL_ADDR
|
||
FIXUP_KERNEL_SYMBOL_ADDR (nl);
|
||
# endif
|
||
offset = nl[0].n_value;
|
||
}
|
||
# endif /* !SUNOS_5 */
|
||
# else /* sgi */
|
||
int ldav_off;
|
||
|
||
ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
|
||
if (ldav_off != -1)
|
||
offset = (long) ldav_off & 0x7fffffff;
|
||
# endif /* sgi */
|
||
}
|
||
|
||
/* Make sure we have /dev/kmem open. */
|
||
if (!getloadavg_initialized)
|
||
{
|
||
# ifndef SUNOS_5
|
||
channel = open ("/dev/kmem", 0);
|
||
if (channel >= 0)
|
||
{
|
||
/* Set the channel to close on exec, so it does not
|
||
litter any child's descriptor table. */
|
||
# ifdef F_SETFD
|
||
# ifndef FD_CLOEXEC
|
||
# define FD_CLOEXEC 1
|
||
# endif
|
||
(void) fcntl (channel, F_SETFD, FD_CLOEXEC);
|
||
# endif
|
||
getloadavg_initialized = 1;
|
||
}
|
||
# else /* SUNOS_5 */
|
||
/* We pass 0 for the kernel, corefile, and swapfile names
|
||
to use the currently running kernel. */
|
||
kd = kvm_open (0, 0, 0, O_RDONLY, 0);
|
||
if (kd != 0)
|
||
{
|
||
/* nlist the currently running kernel. */
|
||
kvm_nlist (kd, nl);
|
||
offset = nl[0].n_value;
|
||
getloadavg_initialized = 1;
|
||
}
|
||
# endif /* SUNOS_5 */
|
||
}
|
||
|
||
/* If we can, get the load average values. */
|
||
if (offset && getloadavg_initialized)
|
||
{
|
||
/* Try to read the load. */
|
||
# ifndef SUNOS_5
|
||
if (lseek (channel, offset, 0) == -1L
|
||
|| read (channel, (char *) load_ave, sizeof (load_ave))
|
||
!= sizeof (load_ave))
|
||
{
|
||
close (channel);
|
||
getloadavg_initialized = 0;
|
||
}
|
||
# else /* SUNOS_5 */
|
||
if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
|
||
!= sizeof (load_ave))
|
||
{
|
||
kvm_close (kd);
|
||
getloadavg_initialized = 0;
|
||
}
|
||
# endif /* SUNOS_5 */
|
||
}
|
||
|
||
if (offset == 0 || !getloadavg_initialized)
|
||
return -1;
|
||
# endif /* LOAD_AVE_TYPE and not VMS */
|
||
|
||
# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
|
||
if (nelem > 0)
|
||
loadavg[elem++] = LDAV_CVT (load_ave[0]);
|
||
if (nelem > 1)
|
||
loadavg[elem++] = LDAV_CVT (load_ave[1]);
|
||
if (nelem > 2)
|
||
loadavg[elem++] = LDAV_CVT (load_ave[2]);
|
||
|
||
# define LDAV_DONE
|
||
# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
|
||
|
||
# ifdef LDAV_DONE
|
||
return elem;
|
||
# else
|
||
/* Set errno to zero to indicate that there was no particular error;
|
||
this function just can't work at all on this system. */
|
||
errno = 0;
|
||
return -1;
|
||
# endif
|
||
}
|
||
|
||
#endif /* ! HAVE_GETLOADAVG */
|
||
|
||
#ifdef TEST
|
||
#include "make.h"
|
||
|
||
int
|
||
main (argc, argv)
|
||
int argc;
|
||
char **argv;
|
||
{
|
||
int naptime = 0;
|
||
|
||
if (argc > 1)
|
||
naptime = atoi (argv[1]);
|
||
|
||
while (1)
|
||
{
|
||
double avg[3];
|
||
int loads;
|
||
|
||
errno = 0; /* Don't be misled if it doesn't set errno. */
|
||
loads = getloadavg (avg, 3);
|
||
if (loads == -1)
|
||
{
|
||
perror ("Error getting load average");
|
||
exit (1);
|
||
}
|
||
if (loads > 0)
|
||
printf ("1-minute: %f ", avg[0]);
|
||
if (loads > 1)
|
||
printf ("5-minute: %f ", avg[1]);
|
||
if (loads > 2)
|
||
printf ("15-minute: %f ", avg[2]);
|
||
if (loads > 0)
|
||
putchar ('\n');
|
||
|
||
if (naptime == 0)
|
||
break;
|
||
sleep (naptime);
|
||
}
|
||
|
||
exit (0);
|
||
}
|
||
#endif /* TEST */
|