/* Get the system load averages.
- Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2011 Free Software
+ Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2014 Free Software
Foundation, Inc.
NOTE: The canonical source of this file is maintained with gnulib.
macro that comes with autoconf 2.13 or newer.
If that isn't an option, then just put
AC_CHECK_FUNCS(pstat_getdynamic) in your
- configure.in file.
+ configure.ac 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.
NLIST_STRUCT Include nlist.h, not a.out.h.
N_NAME_POINTER 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'.
+ 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.
We also #define LDAV_PRIVILEGED if a program will require
special installation to be able to call getloadavg. */
-/* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems
- with partially-configured source directories. */
-
-#ifndef CONFIGURING_GETLOADAVG
-# include <config.h>
-# include <stdbool.h>
-#endif
+#include <config.h>
/* Specification. */
#include <stdlib.h>
#include <errno.h>
+#include <stdbool.h>
#include <stdio.h>
-/* Exclude all the code except the test program at the end
- if the system has its own `getloadavg' function. */
-
-#ifndef HAVE_GETLOADAVG
-
# include <sys/types.h>
-/* 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)
+# if HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# include "intprops.h"
-/* 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 (BSD) && defined (ultrix)
/* Ultrix behaves like BSD on Vaxen. */
# define BSD
/* 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. */
+ or -1 (setting errno) if an error occurred. */
int
getloadavg (double loadavg[], int nelem)
# 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;
+ errno = ENOSYS;
elem = -1;
# endif
-# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
+# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) /* Solaris <= 2.6 */
/* Use libkstat because we don't have to be root. */
# define LDAV_DONE
kstat_ctl_t *kc;
kstat_t *ksp;
kstat_named_t *kn;
+ int saved_errno;
kc = kstat_open ();
if (kc == 0)
}
}
+ saved_errno = errno;
kstat_close (kc);
+ errno = saved_errno;
# endif /* HAVE_LIBKSTAT */
# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
+ /* HP-UX */
/* Use pstat_getdynamic() because we don't have to be root. */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
-# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT
+# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT /* AIX */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
/* Use perfstat_cpu_total because we don't have to be root. */
# endif
# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__))
+ /* Linux without glibc, Cygwin */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")];
char const *ptr = ldavgbuf;
- int fd, count;
+ int fd, count, saved_errno;
fd = open (LINUX_LDAV_FILE, O_RDONLY);
if (fd == -1)
return -1;
count = read (fd, ldavgbuf, sizeof ldavgbuf - 1);
+ saved_errno = errno;
(void) close (fd);
+ errno = saved_errno;
if (count <= 0)
return -1;
ldavgbuf[count] = '\0';
{
double numerator = 0;
double denominator = 1;
- bool have_digit = false;
while (*ptr == ' ')
ptr++;
if (! ('0' <= *ptr && *ptr <= '9'))
{
if (elem == 0)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
break;
}
# endif /* __linux__ || __CYGWIN__ */
-# if !defined (LDAV_DONE) && defined (__NetBSD__)
+# if !defined (LDAV_DONE) && defined (__NetBSD__) /* NetBSD < 0.9 */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
&scale);
(void) fclose (fp);
if (count != 4)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
for (elem = 0; elem < nelem; elem++)
loadavg[elem] = (double) load_ave[elem] / (double) scale;
# endif /* __NetBSD__ */
-# if !defined (LDAV_DONE) && defined (NeXT)
+# if !defined (LDAV_DONE) && defined (NeXT) /* NeXTStep */
# define LDAV_DONE
/* The NeXT code was adapted from iscreen 3.2. */
}
if (!getloadavg_initialized)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
# endif /* NeXT */
# if !defined (LDAV_DONE) && defined (UMAX)
# 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 *'. */
+ 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);
# endif /* OSF_MIPS */
# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
+ /* DJGPP */
# define LDAV_DONE
/* A faithful emulation is going to have to be saved for a rainy day. */
}
# endif /* __MSDOS__ || WINDOWS32 */
-# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
+# if !defined (LDAV_DONE) && defined (OSF_ALPHA) /* OSF/1 */
# define LDAV_DONE
struct tbl_loadavg load_ave;
: (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 */
/* VMS specific code -- read from the Load Ave driver. */
LOAD_AVE_TYPE load_ave[3];
}
if (!getloadavg_initialized)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
# endif /* ! defined LDAV_DONE && defined __VMS */
# if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS
+ /* IRIX, other old systems */
/* UNIX-specific code -- read the average from /dev/kmem. */
}
# endif /* !SUNOS_5 */
# else /* sgi */
- int ldav_off;
-
- ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
+ ptrdiff_t ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
if (ldav_off != -1)
offset = (long int) ldav_off & 0x7fffffff;
# endif /* sgi */
}
if (offset == 0 || !getloadavg_initialized)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
# endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */
# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
# 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;
+ errno = ENOSYS;
elem = -1;
# endif
return elem;
}
-
-#endif /* ! HAVE_GETLOADAVG */
-\f
-#ifdef TEST
-int
-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");
- return EXIT_FAILURE;
- }
- 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);
- }
-
- return EXIT_SUCCESS;
-}
-#endif /* TEST */
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