/* Get the system load averages.
- Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995, 1997
- Free Software Foundation, Inc.
+
+ Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994,
+ 1995, 1997, 1999, 2000, 2003, 2004, 2005, 2006 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
it under the terms of the GNU General Public License as published by
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
USA. */
/* Compile-time symbols that this file uses:
AC_CHECK_FUNCS(pstat_getdynamic) in your
configure.in file.
FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
- KERNEL_FILE Pathname of the kernel to nlist.
+ KERNEL_FILE Name of the kernel file 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;
+ or we have libkstat;
otherwise, no load average is available.
- NLIST_NAME_UNION struct nlist has an n_un member, not n_name.
- LINUX_LDAV_FILE [__linux__]: File containing load averages.
+ HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults
+ to this.
+ NLIST_STRUCT Include nlist.h, not a.out.h, and
+ 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__, __CYGWIN__]: File containing
+ load averages.
Specific system predefines this file uses, aside from setting
default values if not emacs:
UMAX4_3
VMS
WINDOWS32 No-op for Windows95/NT.
- __linux__ Linux: assumes /proc filesystem mounted.
- Support from Michael K. Johnson.
- __NetBSD__ NetBSD: assumes /kern filesystem mounted.
+ __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
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 <sys/types.h>
+/* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems
+ with partially-configured source directories. */
-/* Both the Emacs and non-Emacs sections want this. Some
- configuration files' definitions for the LOAD_AVE_CVT macro (like
- sparc.h's) use macros like FSCALE, defined here. */
-#ifdef unix
-# include <sys/param.h>
+#ifndef CONFIGURING_GETLOADAVG
+# include <config.h>
+# include <stdbool.h>
#endif
+#include <errno.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.
-
- The declaration of `errno' is needed by the test program
- as well as the function itself, so it comes first. */
+ if the system has its own `getloadavg' function. */
-#include <errno.h>
+#ifndef HAVE_GETLOADAVG
-#ifndef errno
-extern int errno;
-#endif
+# include <sys/types.h>
-#if HAVE_LOCALE_H
-# include <locale.h>
-#endif
-#if !HAVE_SETLOCALE
-# define setlocale(Category, Locale) /* empty */
-#endif
+/* Both the Emacs and non-Emacs sections want this. Some
+ configuration files' definitions for the LOAD_AVE_CVT macro (like
+ sparc.h's) use macros like FSCALE, defined here. */
+# if defined (unix) || defined (__unix)
+# include <sys/param.h>
+# endif
-#ifndef HAVE_GETLOADAVG
+# include "c-strtod.h"
+# include "cloexec.h"
+# include "intprops.h"
+# include "xalloc.h"
/* The existing Emacs configuration files define a macro called
LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
LOAD_AVE_CVT, but future machine config files should just define
LDAV_CVT directly. */
-# if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
+# if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT)
# define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
# endif
# undef FSCALE
# endif
+/* Same issues as for NeXT apply to the HURD-based GNU system. */
+# ifdef __GNU__
+# undef BSD
+# undef FSCALE
+# endif /* __GNU__ */
+
/* Set values that are different from the defaults, which are
set a little farther down with #ifndef. */
# define sun
# endif
-# if defined(hp300) && !defined(hpux)
+# if defined (hp300) && !defined (hpux)
# define MORE_BSD
# endif
-# if defined(ultrix) && defined(mips)
+# if defined (ultrix) && defined (mips)
# define decstation
# endif
# define SVR4
# endif
-# if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
+# if (defined (sun) && defined (SVR4)) || defined (SOLARIS2)
# define SUNOS_5
# endif
# define LOAD_AVE_TYPE long
# endif
-# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
+# if defined (alliant) && defined (i860) /* Alliant FX/2800 */
# define LOAD_AVE_TYPE long
# endif
# define FSCALE 1024.0
# endif
-# if defined(alliant) && defined(i860) /* Alliant FX/2800 */
+# 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
# endif
-# ifndef FSCALE
+# ifndef FSCALE
/* SunOS and some others define FSCALE in sys/param.h. */
# define FSCALE 2048.0
# endif
-# if defined(MIPS) || defined(SVR4) || defined(decstation)
+# if defined (MIPS) || defined (SVR4) || defined (decstation)
# define FSCALE 256
# endif
# define LDAV_CVT(n) (((double) (n)) / FSCALE)
# endif
-# if defined(sgi) || (defined(mips) && !defined(BSD))
+# ifndef NLIST_STRUCT
+# if HAVE_NLIST_H
+# define NLIST_STRUCT
+# endif
+# endif
+
+# if defined (sgi) || (defined (mips) && !defined (BSD))
# define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
# endif
# define KERNEL_FILE "/hp-ux"
# endif
-# if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
+# if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
# define KERNEL_FILE "/unix"
# 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))
# define LDAV_SYMBOL "avenrun"
# endif
-# ifdef HAVE_UNISTD_H
-# include <unistd.h>
-# endif
-
-# include <stdio.h>
+# include <unistd.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))
+# 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 VMS
+# ifndef __VMS
# ifndef __linux__
-# ifndef HAVE_NLIST_H
+# ifndef NLIST_STRUCT
# include <a.out.h>
-# else /* HAVE_NLIST_H */
+# else /* NLIST_STRUCT */
# include <nlist.h>
-# endif /* HAVE_NLIST_H */
+# endif /* NLIST_STRUCT */
# ifdef SUNOS_5
# include <fcntl.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(__GNU__) && !defined (NeXT)
+# 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,
but not exactly. */
# endif /* sgi */
# ifdef UMAX
-# include <stdio.h>
# include <signal.h>
# include <sys/time.h>
# include <sys/wait.h>
# include <sys/dg_sys_info.h>
# endif
-# if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
-# include <fcntl.h>
-# else
-# include <sys/file.h>
-# endif
+# include "fcntl--.h"
\f
/* 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;
+static bool getloadavg_initialized;
# endif /* NeXT */
# ifdef UMAX
static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
# endif /* DGUX */
-# ifdef LOAD_AVE_TYPE
+# 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;
+/* True iff channel is valid. */
+static bool 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__)
+# 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 /* SUNOS_5 */
-# endif /* LOAD_AVE_TYPE */
+# endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
\f
/* Put the 1 minute, 5 minute and 15 minute load averages
into the first NELEM elements of LOADAVG.
or -1 if an error occurred. */
int
-getloadavg (loadavg, nelem)
- double loadavg[];
- int nelem;
+getloadavg (double loadavg[], int nelem)
{
int elem = 0; /* Return value. */
if (kc == 0)
return -1;
ksp = kstat_lookup (kc, "unix", 0, "system_misc");
- if (ksp == 0 )
+ if (ksp == 0)
return -1;
if (kstat_read (kc, ksp, 0) == -1)
return -1;
}
if (nelem >= 1)
- loadavg[elem++] = (double) kn->value.ul/FSCALE;
+ 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;
+ 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;
+ loadavg[elem++] = (double) kn->value.ul / FSCALE;
}
}
}
# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
-# if !defined (LDAV_DONE) && defined (__linux__)
+# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__))
# define LDAV_DONE
# undef LOAD_AVE_TYPE
# define LINUX_LDAV_FILE "/proc/loadavg"
# endif
- char ldavgbuf[40];
- double load_ave[3];
+ char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")];
+ char const *ptr = ldavgbuf;
int fd, count;
fd = open (LINUX_LDAV_FILE, O_RDONLY);
if (fd == -1)
return -1;
- count = read (fd, ldavgbuf, 40);
+ count = read (fd, ldavgbuf, sizeof ldavgbuf - 1);
(void) close (fd);
if (count <= 0)
return -1;
+ ldavgbuf[count] = '\0';
- /* 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];
+ for (elem = 0; elem < nelem; elem++)
+ {
+ char *endptr;
+ double d = c_strtod (ptr, &endptr);
+ if (ptr == endptr)
+ {
+ if (elem == 0)
+ return -1;
+ break;
+ }
+ loadavg[elem] = d;
+ ptr = endptr;
+ }
return elem;
-# endif /* __linux__ */
+# endif /* __linux__ || __CYGWIN__ */
# if !defined (LDAV_DONE) && defined (__NetBSD__)
# define LDAV_DONE
host_t host;
struct processor_set_basic_info info;
- unsigned info_count;
+ unsigned int 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;
+ getloadavg_initialized = true;
}
if (getloadavg_initialized)
if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
(processor_set_info_t) &info, &info_count)
!= KERN_SUCCESS)
- getloadavg_initialized = 0;
+ getloadavg_initialized = false;
else
{
if (nelem > 0)
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));
+ ? 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)
+# 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;
+ static bool getloadavg_initialized;
# ifdef eunice
struct
{
$DESCRIPTOR (descriptor, "LAV0:");
# endif
if (sys$assign (&descriptor, &channel, 0, 0) & 1)
- getloadavg_initialized = 1;
+ getloadavg_initialized = true;
}
/* Read the load average vector. */
load_ave, 12, 0, 0, 0, 0) & 1))
{
sys$dassgn (channel);
- getloadavg_initialized = 0;
+ getloadavg_initialized = false;
}
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 (offset == 0)
{
# ifndef sgi
-# ifndef HAVE_NLIST_H
+# ifndef NLIST_STRUCT
strcpy (nl[0].n_name, LDAV_SYMBOL);
strcpy (nl[1].n_name, "");
-# else /* HAVE_NLIST_H */
-# ifdef NLIST_NAME_UNION
+# 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 NLIST_NAME_UNION */
+# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
nl[0].n_name = LDAV_SYMBOL;
nl[1].n_name = 0;
-# endif /* not NLIST_NAME_UNION */
-# endif /* HAVE_NLIST_H */
+# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
+# endif /* NLIST_STRUCT */
# ifndef SUNOS_5
if (
ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
if (ldav_off != -1)
- offset = (long) ldav_off & 0x7fffffff;
+ offset = (long int) ldav_off & 0x7fffffff;
# endif /* sgi */
}
if (!getloadavg_initialized)
{
# ifndef SUNOS_5
- channel = open ("/dev/kmem", 0);
+ channel = open ("/dev/kmem", O_RDONLY);
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;
+ set_cloexec_flag (channel, true);
+ getloadavg_initialized = true;
}
# else /* SUNOS_5 */
/* We pass 0 for the kernel, corefile, and swapfile names
/* nlist the currently running kernel. */
kvm_nlist (kd, nl);
offset = nl[0].n_value;
- getloadavg_initialized = 1;
+ getloadavg_initialized = true;
}
# endif /* SUNOS_5 */
}
!= sizeof (load_ave))
{
close (channel);
- getloadavg_initialized = 0;
+ getloadavg_initialized = false;
}
# else /* SUNOS_5 */
if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
!= sizeof (load_ave))
- {
- kvm_close (kd);
- getloadavg_initialized = 0;
+ {
+ kvm_close (kd);
+ getloadavg_initialized = false;
}
# endif /* SUNOS_5 */
}
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 */
\f
#ifdef TEST
-void
-main (argc, argv)
- int argc;
- char **argv;
+int
+main (int argc, char **argv)
{
int naptime = 0;
if (loads == -1)
{
perror ("Error getting load average");
- exit (1);
+ return EXIT_FAILURE;
}
if (loads > 0)
printf ("1-minute: %f ", avg[0]);
sleep (naptime);
}
- exit (0);
+ return EXIT_SUCCESS;
}
#endif /* TEST */
projects / gnulib.git / blobdiff