Mercurial > hg > xemacs-beta
view src/getloadavg.c @ 665:fdefd0186b75
[xemacs-hg @ 2001-09-20 06:28:42 by ben]
The great integral types renaming.
The purpose of this is to rationalize the names used for various
integral types, so that they match their intended uses and follow
consist conventions, and eliminate types that were not semantically
different from each other.
The conventions are:
-- All integral types that measure quantities of anything are
signed. Some people disagree vociferously with this, but their
arguments are mostly theoretical, and are vastly outweighed by
the practical headaches of mixing signed and unsigned values,
and more importantly by the far increased likelihood of
inadvertent bugs: Because of the broken "viral" nature of
unsigned quantities in C (operations involving mixed
signed/unsigned are done unsigned, when exactly the opposite is
nearly always wanted), even a single error in declaring a
quantity unsigned that should be signed, or even the even more
subtle error of comparing signed and unsigned values and
forgetting the necessary cast, can be catastrophic, as
comparisons will yield wrong results. -Wsign-compare is turned
on specifically to catch this, but this tends to result in a
great number of warnings when mixing signed and unsigned, and
the casts are annoying. More has been written on this
elsewhere.
-- All such quantity types just mentioned boil down to EMACS_INT,
which is 32 bits on 32-bit machines and 64 bits on 64-bit
machines. This is guaranteed to be the same size as Lisp
objects of type `int', and (as far as I can tell) of size_t
(unsigned!) and ssize_t. The only type below that is not an
EMACS_INT is Hashcode, which is an unsigned value of the same
size as EMACS_INT.
-- Type names should be relatively short (no more than 10
characters or so), with the first letter capitalized and no
underscores if they can at all be avoided.
-- "count" == a zero-based measurement of some quantity. Includes
sizes, offsets, and indexes.
-- "bpos" == a one-based measurement of a position in a buffer.
"Charbpos" and "Bytebpos" count text in the buffer, rather than
bytes in memory; thus Bytebpos does not directly correspond to
the memory representation. Use "Membpos" for this.
-- "Char" refers to internal-format characters, not to the C type
"char", which is really a byte.
-- For the actual name changes, see the script below.
I ran the following script to do the conversion. (NOTE: This script
is idempotent. You can safely run it multiple times and it will
not screw up previous results -- in fact, it will do nothing if
nothing has changed. Thus, it can be run repeatedly as necessary
to handle patches coming in from old workspaces, or old branches.)
There are two tags, just before and just after the change:
`pre-integral-type-rename' and `post-integral-type-rename'. When
merging code from the main trunk into a branch, the best thing to
do is first merge up to `pre-integral-type-rename', then apply the
script and associated changes, then merge from
`post-integral-type-change' to the present. (Alternatively, just do
the merging in one operation; but you may then have a lot of
conflicts needing to be resolved by hand.)
Script `fixtypes.sh' follows:
----------------------------------- cut ------------------------------------
files="*.[ch] s/*.h m/*.h config.h.in ../configure.in Makefile.in.in ../lib-src/*.[ch] ../lwlib/*.[ch]"
gr Memory_Count Bytecount $files
gr Lstream_Data_Count Bytecount $files
gr Element_Count Elemcount $files
gr Hash_Code Hashcode $files
gr extcount bytecount $files
gr bufpos charbpos $files
gr bytind bytebpos $files
gr memind membpos $files
gr bufbyte intbyte $files
gr Extcount Bytecount $files
gr Bufpos Charbpos $files
gr Bytind Bytebpos $files
gr Memind Membpos $files
gr Bufbyte Intbyte $files
gr EXTCOUNT BYTECOUNT $files
gr BUFPOS CHARBPOS $files
gr BYTIND BYTEBPOS $files
gr MEMIND MEMBPOS $files
gr BUFBYTE INTBYTE $files
gr MEMORY_COUNT BYTECOUNT $files
gr LSTREAM_DATA_COUNT BYTECOUNT $files
gr ELEMENT_COUNT ELEMCOUNT $files
gr HASH_CODE HASHCODE $files
----------------------------------- cut ------------------------------------
`fixtypes.sh' is a Bourne-shell script; it uses 'gr':
----------------------------------- cut ------------------------------------
#!/bin/sh
# Usage is like this:
# gr FROM TO FILES ...
# globally replace FROM with TO in FILES. FROM and TO are regular expressions.
# backup files are stored in the `backup' directory.
from="$1"
to="$2"
shift 2
echo ${1+"$@"} | xargs global-replace "s/$from/$to/g"
----------------------------------- cut ------------------------------------
`gr' in turn uses a Perl script to do its real work,
`global-replace', which follows:
----------------------------------- cut ------------------------------------
: #-*- Perl -*-
### global-modify --- modify the contents of a file by a Perl expression
## Copyright (C) 1999 Martin Buchholz.
## Copyright (C) 2001 Ben Wing.
## Authors: Martin Buchholz <martin@xemacs.org>, Ben Wing <ben@xemacs.org>
## Maintainer: Ben Wing <ben@xemacs.org>
## Current Version: 1.0, May 5, 2001
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with XEmacs; see the file COPYING. If not, write to the Free
# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
eval 'exec perl -w -S $0 ${1+"$@"}'
if 0;
use strict;
use FileHandle;
use Carp;
use Getopt::Long;
use File::Basename;
(my $myName = $0) =~ s@.*/@@; my $usage="
Usage: $myName [--help] [--backup-dir=DIR] [--line-mode] [--hunk-mode]
PERLEXPR FILE ...
Globally modify a file, either line by line or in one big hunk.
Typical usage is like this:
[with GNU print, GNU xargs: guaranteed to handle spaces, quotes, etc.
in file names]
find . -name '*.[ch]' -print0 | xargs -0 $0 's/\bCONST\b/const/g'\n
[with non-GNU print, xargs]
find . -name '*.[ch]' -print | xargs $0 's/\bCONST\b/const/g'\n
The file is read in, either line by line (with --line-mode specified)
or in one big hunk (with --hunk-mode specified; it's the default), and
the Perl expression is then evalled with \$_ set to the line or hunk of
text, including the terminating newline if there is one. It should
destructively modify the value there, storing the changed result in \$_.
Files in which any modifications are made are backed up to the directory
specified using --backup-dir, or to `backup' by default. To disable this,
use --backup-dir= with no argument.
Hunk mode is the default because it is MUCH MUCH faster than line-by-line.
Use line-by-line only when it matters, e.g. you want to do a replacement
only once per line (the default without the `g' argument). Conversely,
when using hunk mode, *ALWAYS* use `g'; otherwise, you will only make one
replacement in the entire file!
";
my %options = ();
$Getopt::Long::ignorecase = 0;
&GetOptions (
\%options,
'help', 'backup-dir=s', 'line-mode', 'hunk-mode',
);
die $usage if $options{"help"} or @ARGV <= 1;
my $code = shift;
die $usage if grep (-d || ! -w, @ARGV);
sub SafeOpen {
open ((my $fh = new FileHandle), $_[0]);
confess "Can't open $_[0]: $!" if ! defined $fh;
return $fh;
}
sub SafeClose {
close $_[0] or confess "Can't close $_[0]: $!";
}
sub FileContents {
my $fh = SafeOpen ("< $_[0]");
my $olddollarslash = $/;
local $/ = undef;
my $contents = <$fh>;
$/ = $olddollarslash;
return $contents;
}
sub WriteStringToFile {
my $fh = SafeOpen ("> $_[0]");
binmode $fh;
print $fh $_[1] or confess "$_[0]: $!\n";
SafeClose $fh;
}
foreach my $file (@ARGV) {
my $changed_p = 0;
my $new_contents = "";
if ($options{"line-mode"}) {
my $fh = SafeOpen $file;
while (<$fh>) {
my $save_line = $_;
eval $code;
$changed_p = 1 if $save_line ne $_;
$new_contents .= $_;
}
} else {
my $orig_contents = $_ = FileContents $file;
eval $code;
if ($_ ne $orig_contents) {
$changed_p = 1;
$new_contents = $_;
}
}
if ($changed_p) {
my $backdir = $options{"backup-dir"};
$backdir = "backup" if !defined ($backdir);
if ($backdir) {
my ($name, $path, $suffix) = fileparse ($file, "");
my $backfulldir = $path . $backdir;
my $backfile = "$backfulldir/$name";
mkdir $backfulldir, 0755 unless -d $backfulldir;
print "modifying $file (original saved in $backfile)\n";
rename $file, $backfile;
}
WriteStringToFile ($file, $new_contents);
}
}
----------------------------------- cut ------------------------------------
In addition to those programs, I needed to fix up a few other
things, particularly relating to the duplicate definitions of
types, now that some types merged with others. Specifically:
1. in lisp.h, removed duplicate declarations of Bytecount. The
changed code should now look like this: (In each code snippet
below, the first and last lines are the same as the original, as
are all lines outside of those lines. That allows you to locate
the section to be replaced, and replace the stuff in that
section, verifying that there isn't anything new added that
would need to be kept.)
--------------------------------- snip -------------------------------------
/* Counts of bytes or chars */
typedef EMACS_INT Bytecount;
typedef EMACS_INT Charcount;
/* Counts of elements */
typedef EMACS_INT Elemcount;
/* Hash codes */
typedef unsigned long Hashcode;
/* ------------------------ dynamic arrays ------------------- */
--------------------------------- snip -------------------------------------
2. in lstream.h, removed duplicate declaration of Bytecount.
Rewrote the comment about this type. The changed code should
now look like this:
--------------------------------- snip -------------------------------------
#endif
/* The have been some arguments over the what the type should be that
specifies a count of bytes in a data block to be written out or read in,
using Lstream_read(), Lstream_write(), and related functions.
Originally it was long, which worked fine; Martin "corrected" these to
size_t and ssize_t on the grounds that this is theoretically cleaner and
is in keeping with the C standards. Unfortunately, this practice is
horribly error-prone due to design flaws in the way that mixed
signed/unsigned arithmetic happens. In fact, by doing this change,
Martin introduced a subtle but fatal error that caused the operation of
sending large mail messages to the SMTP server under Windows to fail.
By putting all values back to be signed, avoiding any signed/unsigned
mixing, the bug immediately went away. The type then in use was
Lstream_Data_Count, so that it be reverted cleanly if a vote came to
that. Now it is Bytecount.
Some earlier comments about why the type must be signed: This MUST BE
SIGNED, since it also is used in functions that return the number of
bytes actually read to or written from in an operation, and these
functions can return -1 to signal error.
Note that the standard Unix read() and write() functions define the
count going in as a size_t, which is UNSIGNED, and the count going
out as an ssize_t, which is SIGNED. This is a horrible design
flaw. Not only is it highly likely to lead to logic errors when a
-1 gets interpreted as a large positive number, but operations are
bound to fail in all sorts of horrible ways when a number in the
upper-half of the size_t range is passed in -- this number is
unrepresentable as an ssize_t, so code that checks to see how many
bytes are actually written (which is mandatory if you are dealing
with certain types of devices) will get completely screwed up.
--ben
*/
typedef enum lstream_buffering
--------------------------------- snip -------------------------------------
3. in dumper.c, there are four places, all inside of switch()
statements, where XD_BYTECOUNT appears twice as a case tag. In
each case, the two case blocks contain identical code, and you
should *REMOVE THE SECOND* and leave the first.
| author | ben |
|---|---|
| date | Thu, 20 Sep 2001 06:31:11 +0000 |
| parents | b39c14581166 |
| children | 943eaba38521 |
line wrap: on
line source
/* Get the system load averages. Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995 Free Software Foundation, Inc. This file is part of XEmacs. XEmacs is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. XEmacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with XEmacs; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Compile-time symbols that this file uses: FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. KERNEL_FILE Pathname of the kernel to nlist. LDAV_CVT() Scale the load average from the kernel. Returns a double. LDAV_SYMBOL Name of kernel symbol giving load average. LOAD_AVE_TYPE Type of the load average array in the kernel. Must be defined unless one of apollo, DGUX, NeXT, or UMAX is defined; otherwise, no load average is available. NLIST_STRUCT Include nlist.h, not a.out.h, and the nlist n_name element is a pointer, not an array. NLIST_NAME_UNION struct nlist has an n_un member, not n_name. LINUX_LDAV_FILE [__linux__]: File containing load averages. Specific system predefines this file uses, aside from setting default values if not emacs: apollo BSD Real BSD, not just BSD-like. convex DGUX hpux NeXT sgi sequent Sequent Dynix 3.x.x (BSD) _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) sony_news NEWS-OS (works at least for 4.1C) UMAX UMAX4_3 WIN32_NATIVE No-op for Windows9x/NT. CYGWIN No-op for Cygwin. __linux__ Linux: assumes /proc filesystem mounted. Support from Michael K. Johnson. __NetBSD__ NetBSD: assumes /kern filesystem mounted. __OpenBSD__ OpenBSD: ditto. In addition, to avoid nesting many #ifdefs, we internally set LDAV_DONE to indicate that the load average has been computed. We also #define LDAV_PRIVILEGED if a program will require special installation to be able to call getloadavg. */ /* This should always be first. */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "lisp.h" #include "sysfile.h" /* for encapsulated open, close, read, write */ #ifndef HAVE_GETLOADAVG /* The existing Emacs configuration files define a macro called LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and returns the load average multiplied by 100. What we actually want is a macro called LDAV_CVT, which returns the load average as an unmultiplied double. For backwards compatibility, we'll define LDAV_CVT in terms of LOAD_AVE_CVT, but future machine config files should just define LDAV_CVT directly. */ #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT) #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) #endif #if defined (HAVE_KSTAT_H) #include <kstat.h> #endif /* HAVE_KSTAT_H */ #if !defined (BSD) && defined (ultrix) /* Ultrix behaves like BSD on Vaxen. */ #define BSD #endif #ifdef NeXT /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which conflicts with the definition understood in this file, that this really is BSD. */ #undef BSD /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being defined to mean that the nlist method should be used, which is not true. */ #undef FSCALE #endif /* Set values that are different from the defaults, which are set a little farther down with #ifndef. */ /* Some shorthands. */ #if defined (HPUX) && !defined (hpux) #define hpux #endif #if defined(hp300) && !defined(hpux) #define MORE_BSD #endif #if defined(ultrix) && defined(mips) #define decstation #endif #if (defined(sun) && defined(SVR4)) || defined (SOLARIS2) #define SUNOS_5 #endif #if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) #define OSF_ALPHA #include <netdb.h> #include <netinet/in.h> /* Needed for Digital UNIX V3 */ #include <net/proto_net.h> #include <sys/table.h> #endif #if defined (__osf__) && (defined (mips) || defined (__mips__)) #define OSF_MIPS #include <sys/table.h> #endif /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine that with a couple of other things and we'll have a unique match. */ #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) #define tek4300 /* Define by emacs, but not by other users. */ #endif /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ #ifndef LOAD_AVE_TYPE #ifdef MORE_BSD #define LOAD_AVE_TYPE long #endif #ifdef sun #define LOAD_AVE_TYPE long #endif #ifdef decstation #define LOAD_AVE_TYPE long #endif #ifdef _SEQUENT_ #define LOAD_AVE_TYPE long #endif #ifdef sgi #define LOAD_AVE_TYPE long #endif #ifdef SVR4 #define LOAD_AVE_TYPE long #endif #ifdef sony_news #define LOAD_AVE_TYPE long #endif #ifdef sequent #define LOAD_AVE_TYPE long #endif #ifdef OSF_ALPHA #define LOAD_AVE_TYPE long #endif #if defined (ardent) && defined (titan) #define LOAD_AVE_TYPE long #endif #ifdef tek4300 #define LOAD_AVE_TYPE long #endif #if defined(alliant) && defined(i860) /* Alliant FX/2800 */ #define LOAD_AVE_TYPE long #endif #ifdef _AIX #define LOAD_AVE_TYPE long #endif #ifdef convex #define LOAD_AVE_TYPE double #ifndef LDAV_CVT #define LDAV_CVT(n) (n) #endif #endif #endif /* No LOAD_AVE_TYPE. */ #ifdef OSF_ALPHA /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, according to ghazi@noc.rutgers.edu. */ #undef FSCALE #define FSCALE 1024.0 #endif #if defined(alliant) && defined(i860) /* Alliant FX/2800 */ /* <sys/param.h> defines an incorrect value for FSCALE on an Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */ #undef FSCALE #define FSCALE 100.0 #endif #ifndef FSCALE /* SunOS and some others define FSCALE in sys/param.h. */ #ifdef MORE_BSD #define FSCALE 2048.0 #endif #if defined(MIPS) || defined(SVR4) || defined(decstation) #define FSCALE 256 #endif #if defined (sgi) || defined (sequent) /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined above under #ifdef MIPS. But we want the sgi value. */ #undef FSCALE #define FSCALE 1000.0 #endif #if defined (ardent) && defined (titan) #define FSCALE 65536.0 #endif #ifdef tek4300 #define FSCALE 100.0 #endif #ifdef _AIX #define FSCALE 65536.0 #endif #endif /* Not FSCALE. */ #if !defined (LDAV_CVT) && defined (FSCALE) #define LDAV_CVT(n) (((double) (n)) / FSCALE) #endif /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */ #ifndef NLIST_STRUCT #ifdef MORE_BSD #define NLIST_STRUCT #endif #ifdef sun #define NLIST_STRUCT #endif #ifdef decstation #define NLIST_STRUCT #endif #ifdef hpux #define NLIST_STRUCT #endif #if defined (_SEQUENT_) || defined (sequent) #define NLIST_STRUCT #endif #ifdef sgi #define NLIST_STRUCT #endif #ifdef SVR4 #define NLIST_STRUCT #endif #ifdef sony_news #define NLIST_STRUCT #endif #ifdef OSF_ALPHA #define NLIST_STRUCT #endif #if defined (ardent) && defined (titan) #define NLIST_STRUCT #endif #ifdef tek4300 #define NLIST_STRUCT #endif #ifdef butterfly #define NLIST_STRUCT #endif #if defined(alliant) && defined(i860) /* Alliant FX/2800 */ #define NLIST_STRUCT #endif #ifdef _AIX #define NLIST_STRUCT #endif #endif /* defined (NLIST_STRUCT) */ #if defined(sgi) || (defined(mips) && !defined(BSD)) #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) #endif #if !defined (KERNEL_FILE) && defined (sequent) #define KERNEL_FILE "/dynix" #endif #if !defined (KERNEL_FILE) && defined (hpux) #define KERNEL_FILE "/hp-ux" #endif #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan))) #define KERNEL_FILE "/unix" #endif #if !defined (LDAV_SYMBOL) && defined (alliant) #define LDAV_SYMBOL "_Loadavg" #endif #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX)) #define LDAV_SYMBOL "avenrun" #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include <stdio.h> /* LOAD_AVE_TYPE should only get defined if we're going to use the nlist method. */ #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL)) #define LOAD_AVE_TYPE double #endif #ifdef LOAD_AVE_TYPE #ifndef NLIST_STRUCT #include <a.out.h> #else /* NLIST_STRUCT */ #include <nlist.h> #endif /* NLIST_STRUCT */ #ifdef SUNOS_5 #include <fcntl.h> #include <kvm.h> #endif #ifndef KERNEL_FILE #define KERNEL_FILE "/vmunix" #endif /* KERNEL_FILE */ #ifndef LDAV_SYMBOL #define LDAV_SYMBOL "_avenrun" #endif /* LDAV_SYMBOL */ #ifndef LDAV_CVT #define LDAV_CVT(n) ((double) (n)) #endif /* !LDAV_CVT */ #endif /* LOAD_AVE_TYPE */ #ifdef NeXT #ifdef HAVE_MACH_MACH_H #include <mach/mach.h> #else #include <mach.h> #endif #endif /* NeXT */ #ifdef sgi #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_SYS_PSTAT_H) #include <sys/pstat.h> #endif /* HAVE_SYS_PSTAT_H (on HPUX) */ /* 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 */ #ifdef LOAD_AVE_TYPE /* File descriptor open to /dev/kmem */ 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; #ifndef sgi static struct nlist nl[2]; #endif /* not sgi */ #ifdef SUNOS_5 static kvm_t *kd; #endif /* SUNOS_5 */ #ifndef countof # define countof(x) (sizeof (x) / sizeof (*(x))) #endif #endif /* LOAD_AVE_TYPE */ /* 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 (double loadavg[], int nelem); int getloadavg (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 = -2; #endif /* NO_GET_LOAD_AVG */ #if ! defined (LDAV_DONE) && defined (HAVE_KSTAT_H) && defined (HAVE_LIBKSTAT) #define LDAV_DONE /* getloadavg is best implemented using kstat (kernel stats), on systems (like SunOS5) that support it, since you don't need special privileges to use it. Initial implementation courtesy Zlatko Calusic <zcalusic@carnet.hr>. Integrated to XEmacs by Hrvoje Niksic <hniksic@xemacs.org>. Additional cleanup by Hrvoje Niksic, based on code published by Casper Dik <Casper.Dik@Holland.Sun.Com>. */ kstat_ctl_t *kc; kstat_t *ksp; static char *avestrings[] = { "avenrun_1min", "avenrun_5min", "avenrun_15min" }; if (nelem > countof (avestrings)) nelem = countof (avestrings); kc = kstat_open (); if (!kc) return -1; ksp = kstat_lookup (kc, "unix", 0, "system_misc"); if (!ksp) { kstat_close (kc); return -1; } if (kstat_read (kc, ksp, 0) < 0) { kstat_close (kc); return -1; } for (elem = 0; elem < nelem; elem++) { kstat_named_t *kn = (kstat_named_t *) kstat_data_lookup (ksp, avestrings[elem]); if (!kn) { kstat_close (kc); return -1; } loadavg[elem] = (double)kn->value.ul / FSCALE; } kstat_close (kc); #endif /* HAVE_KSTAT_H && HAVE_LIBKSTAT */ #if !defined (LDAV_DONE) && defined (HAVE_SYS_PSTAT_H) #define LDAV_DONE /* This is totally undocumented, and is not guaranteed to work, but mayhap it might .... If it does work, it will work only on HP-UX 8.0 or later. -- Darryl Okahata <darrylo@sr.hp.com> */ #undef LOAD_AVE_TYPE /* Make sure these don't exist. */ #undef LOAD_AVE_CVT #undef LDAV_SYMBOL struct pst_dynamic procinfo; union pstun statbuf; statbuf.pst_dynamic = &procinfo; if (pstat (PSTAT_DYNAMIC, statbuf, sizeof (struct pst_dynamic), 0, 0) == -1) return (-1); loadavg[elem++] = procinfo.psd_avg_1_min; loadavg[elem++] = procinfo.psd_avg_5_min; loadavg[elem++] = procinfo.psd_avg_15_min; #endif /* HPUX */ #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; count = sscanf (ldavgbuf, "%lf %lf %lf", &load_ave[0], &load_ave[1], &load_ave[2]); if (count < 1) return -1; for (elem = 0; elem < nelem && elem < count; elem++) loadavg[elem] = load_ave[elem]; #endif /* __linux__ */ #if !defined (LDAV_DONE) && defined (__NetBSD__) || defined (__OpenBSD__) #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; #endif /* __NetBSD__ or __OpenBSD__ */ #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; memset ((char *) &stats, 0, 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 (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 (WIN32_NATIVE) || defined (CYGWIN)) #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 /* WIN32_NATIVE or CYGWIN */ #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(LOAD_AVE_TYPE) /* 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 NLIST_NAME_UNION nl[0].n_un.n_name = LDAV_SYMBOL; nl[1].n_un.n_name = 0; #else /* not NLIST_NAME_UNION */ nl[0].n_name = (char *) LDAV_SYMBOL; nl[1].n_name = 0; #endif /* not NLIST_NAME_UNION */ #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 FD_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; 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 */ return elem; } #endif /* ! HAVE_GETLOADAVG */ #ifdef TEST void main (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 */