/* Get the system load averages.
Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994,
- 1995, 1997, 1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
+ 1995, 1997, 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free
+ Software Foundation, Inc.
NOTE: The canonical source of this file is maintained with gnulib.
Bugs can be reported to bug-gnulib@gnu.org.
- This program is free software; you can redistribute it and/or modify
+ 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.
+ the Free Software Foundation; either version 3 of the License, 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
- USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Compile-time symbols that this file uses:
If that isn't an option, then just put
AC_CHECK_FUNCS(pstat_getdynamic) in your
configure.in file.
+ HAVE_LIBPERFSTAT Define this if your system has the
+ perfstat_cpu_total function in libperfstat (AIX).
FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
KERNEL_FILE Name of the kernel file to nlist.
LDAV_CVT() Scale the load average from the kernel.
the nlist n_name element is a pointer,
not an array.
HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'.
- LINUX_LDAV_FILE [__linux__]: File containing load averages.
+ LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing
+ load averages.
Specific system predefines this file uses, aside from setting
default values if not emacs:
WINDOWS32 No-op for Windows95/NT.
__linux__ Linux: assumes /proc file system mounted.
Support from Michael K. Johnson.
+ __CYGWIN__ Cygwin emulates linux /proc/loadavg.
__NetBSD__ NetBSD: assumes /kern file system mounted.
In addition, to avoid nesting many #ifdefs, we internally set
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
+/* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems
+ with partially-configured source directories. */
+
+#ifndef CONFIGURING_GETLOADAVG
# include <config.h>
+# include <stdbool.h>
#endif
+/* Specification. */
+#include <stdlib.h>
+
#include <errno.h>
-#include <stdbool.h>
#include <stdio.h>
-#include <stdlib.h>
/* Exclude all the code except the test program at the end
if the system has its own `getloadavg' function. */
# include <sys/socket.h>
# include <net/route.h>
# include <sys/table.h>
+/* Tru64 4.0D's table.h redefines sys */
+# undef sys
# endif
# if defined (__osf__) && (defined (mips) || defined (__mips__))
# define LOAD_AVE_TYPE long
# endif
-# ifdef _AIX
+# if defined _AIX && ! defined HAVE_LIBPERFSTAT
# define LOAD_AVE_TYPE long
# endif
# endif
-# ifndef FSCALE
+# ifndef FSCALE
/* SunOS and some others define FSCALE in sys/param.h. */
# define FSCALE 100.0
# endif
-# ifdef _AIX
+# if defined _AIX && !defined HAVE_LIBPERFSTAT
# define FSCALE 65536.0
# endif
# 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))
+# if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || (defined (_AIX) && !defined(HAVE_LIBPERFSTAT)))
# define LDAV_SYMBOL "avenrun"
# endif
-# ifdef HAVE_UNISTD_H
-# include <unistd.h>
-# endif
+# include <unistd.h>
/* LOAD_AVE_TYPE should only get defined if we're going to use the
nlist method. */
# ifdef LOAD_AVE_TYPE
-# ifndef VMS
+# ifndef __VMS
# ifndef __linux__
# ifndef NLIST_STRUCT
# include <a.out.h>
# endif /* LDAV_SYMBOL */
# endif /* __linux__ */
-# else /* VMS */
+# else /* __VMS */
# ifndef eunice
# include <iodef.h>
# else /* eunice */
# include <vms/iodef.h>
# endif /* eunice */
-# endif /* VMS */
+# endif /* __VMS */
# ifndef LDAV_CVT
# define LDAV_CVT(n) ((double) (n))
# endif /* LOAD_AVE_TYPE */
+# if defined HAVE_LIBPERFSTAT
+# include <sys/protosw.h>
+# include <libperfstat.h>
+# include <sys/proc.h>
+# ifndef SBITS
+# define SBITS 16
+# endif
+# endif
+
# if defined (__GNU__) && !defined (NeXT)
/* Note that NeXT Openstep defines __GNU__ even though it should not. */
/* GNU system acts much like NeXT, for load average purposes,
# include <sys/dg_sys_info.h>
# endif
-# include <fcntl.h>
-
-# include "unistd-safer.h"
+# include "fcntl--.h"
\f
/* Avoid static vars inside a function since in HPUX they dump as pure. */
/* Offset in kmem to seek to read load average, or 0 means invalid. */
static long offset;
-# if !defined (VMS) && !defined (sgi) && !defined (__linux__)
+# if ! defined __VMS && ! defined sgi && ! defined __linux__
static struct nlist nl[2];
-# endif /* Not VMS or sgi */
+# endif
# ifdef SUNOS_5
static kvm_t *kd;
# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
-# if !defined (LDAV_DONE) && defined (__linux__)
+# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT
+# define LDAV_DONE
+# undef LOAD_AVE_TYPE
+/* Use perfstat_cpu_total because we don't have to be root. */
+ {
+ perfstat_cpu_total_t cpu_stats;
+ int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1);
+ if (result == -1)
+ return result;
+ loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS);
+ loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS);
+ loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS);
+ elem = 3;
+ }
+# endif
+
+# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__))
# define LDAV_DONE
# undef LOAD_AVE_TYPE
# define LINUX_LDAV_FILE "/proc/loadavg"
# endif
- char ldavgbuf[3 * (INT_STRLEN_BOUND (long int) + sizeof ".00")];
+ char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")];
char const *ptr = ldavgbuf;
int fd, count;
for (elem = 0; elem < nelem; elem++)
{
char *endptr;
- double d = c_strtod (ptr, &endptr);
- if (ptr == endptr)
+ double d;
+
+ errno = 0;
+ d = c_strtod (ptr, &endptr);
+ if (ptr == endptr || (d == 0 && errno != 0))
{
if (elem == 0)
return -1;
return elem;
-# endif /* __linux__ */
+# endif /* __linux__ || __CYGWIN__ */
# if !defined (LDAV_DONE) && defined (__NetBSD__)
# define LDAV_DONE
: (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
# endif /* OSF_ALPHA */
-# if !defined (LDAV_DONE) && defined (VMS)
+# if ! defined LDAV_DONE && defined __VMS
/* VMS specific code -- read from the Load Ave driver. */
LOAD_AVE_TYPE load_ave[3];
if (!getloadavg_initialized)
return -1;
-# endif /* VMS */
+# endif /* ! defined LDAV_DONE && defined __VMS */
-# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) && !defined (VMS)
+# if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS
/* UNIX-specific code -- read the average from /dev/kmem. */
if (!getloadavg_initialized)
{
# ifndef SUNOS_5
- channel = fd_safer (open ("/dev/kmem", O_RDONLY));
+ channel = open ("/dev/kmem", O_RDONLY);
if (channel >= 0)
{
/* Set the channel to close on exec, so it does not
if (offset == 0 || !getloadavg_initialized)
return -1;
-# endif /* LOAD_AVE_TYPE and not VMS */
+# endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */
# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
if (nelem > 0)
# define LDAV_DONE
# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
-# ifdef LDAV_DONE
- return elem;
-# else
+# if !defined 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;
- return -1;
+ elem = -1;
# endif
+ return elem;
}
#endif /* ! HAVE_GETLOADAVG */