1 /* Get the system load averages.
2 Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995, 1997
3 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20 /* Compile-time symbols that this file uses:
22 HAVE_PSTAT_GETDYNAMIC Define this if your system has the
23 pstat_getdynamic function. I think it
24 is unique to HPUX9. The best way to get the
25 definition is through the AC_FUNC_GETLOADAVG
26 macro that comes with autoconf 2.13 or newer.
27 If that isn't an option, then just put
28 AC_CHECK_FUNCS(pstat_getdynamic) in your
30 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
31 KERNEL_FILE Pathname of the kernel to nlist.
32 LDAV_CVT() Scale the load average from the kernel.
34 LDAV_SYMBOL Name of kernel symbol giving load average.
35 LOAD_AVE_TYPE Type of the load average array in the kernel.
36 Must be defined unless one of
37 apollo, DGUX, NeXT, or UMAX is defined;
39 otherwise, no load average is available.
40 NLIST_STRUCT Include nlist.h, not a.out.h, and
41 the nlist n_name element is a pointer,
43 HAVE_STRUCT_NLIST_N_UN_N_NAME struct nlist has an n_un member, not n_name.
44 LINUX_LDAV_FILE [__linux__]: File containing load averages.
46 Specific system predefines this file uses, aside from setting
47 default values if not emacs:
50 BSD Real BSD, not just BSD-like.
53 eunice UNIX emulator under VMS.
55 __MSDOS__ No-op for MSDOS.
58 sequent Sequent Dynix 3.x.x (BSD)
59 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
60 sony_news NEWS-OS (works at least for 4.1C)
64 WINDOWS32 No-op for Windows95/NT.
65 __linux__ Linux: assumes /proc filesystem mounted.
66 Support from Michael K. Johnson.
67 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
69 In addition, to avoid nesting many #ifdefs, we internally set
70 LDAV_DONE to indicate that the load average has been computed.
72 We also #define LDAV_PRIVILEGED if a program will require
73 special installation to be able to call getloadavg. */
75 /* This should always be first. */
80 #include <sys/types.h>
82 /* Both the Emacs and non-Emacs sections want this. Some
83 configuration files' definitions for the LOAD_AVE_CVT macro (like
84 sparc.h's) use macros like FSCALE, defined here. */
85 #if defined (unix) || defined (__unix)
86 # include <sys/param.h>
90 /* Exclude all the code except the test program at the end
91 if the system has its own `getloadavg' function.
93 The declaration of `errno' is needed by the test program
94 as well as the function itself, so it comes first. */
106 # define setlocale(Category, Locale) /* empty */
109 #ifndef HAVE_GETLOADAVG
112 /* The existing Emacs configuration files define a macro called
113 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
114 returns the load average multiplied by 100. What we actually want
115 is a macro called LDAV_CVT, which returns the load average as an
118 For backwards compatibility, we'll define LDAV_CVT in terms of
119 LOAD_AVE_CVT, but future machine config files should just define
120 LDAV_CVT directly. */
122 # if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
123 # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
126 # if !defined (BSD) && defined (ultrix)
127 /* Ultrix behaves like BSD on Vaxen. */
132 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
133 conflicts with the definition understood in this file, that this
137 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
138 defined to mean that the nlist method should be used, which is not true. */
142 /* Same issues as for NeXT apply to the HURD-based GNU system. */
146 # endif /* __GNU__ */
148 /* Set values that are different from the defaults, which are
149 set a little farther down with #ifndef. */
152 /* Some shorthands. */
154 # if defined (HPUX) && !defined (hpux)
158 # if defined (__hpux) && !defined (hpux)
162 # if defined (__sun) && !defined (sun)
166 # if defined(hp300) && !defined(hpux)
170 # if defined(ultrix) && defined(mips)
174 # if defined (__SVR4) && !defined (SVR4)
178 # if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
182 # if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
184 # include <sys/mbuf.h>
185 # include <sys/socket.h>
186 # include <net/route.h>
187 # include <sys/table.h>
190 # if defined (__osf__) && (defined (mips) || defined (__mips__))
192 # include <sys/table.h>
195 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
196 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
197 that with a couple of other things and we'll have a unique match. */
198 # if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
199 # define tek4300 /* Define by emacs, but not by other users. */
202 /* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */
203 # if defined(__QNX__)
207 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
208 # ifndef LOAD_AVE_TYPE
211 # define LOAD_AVE_TYPE long
215 # define LOAD_AVE_TYPE long
219 # define LOAD_AVE_TYPE long
223 # define LOAD_AVE_TYPE long
227 # define LOAD_AVE_TYPE long
231 # define LOAD_AVE_TYPE long
235 # define LOAD_AVE_TYPE long
239 # define LOAD_AVE_TYPE long
243 # define LOAD_AVE_TYPE long
246 # if defined (ardent) && defined (titan)
247 # define LOAD_AVE_TYPE long
251 # define LOAD_AVE_TYPE long
254 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
255 # define LOAD_AVE_TYPE long
259 # define LOAD_AVE_TYPE long
263 # define LOAD_AVE_TYPE double
265 # define LDAV_CVT(n) (n)
269 # endif /* No LOAD_AVE_TYPE. */
272 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
273 according to ghazi@noc.rutgers.edu. */
275 # define FSCALE 1024.0
278 # if defined(alliant) && defined(i860) /* Alliant FX/2800 */
279 /* <sys/param.h> defines an incorrect value for FSCALE on an
280 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
282 # define FSCALE 100.0
288 /* SunOS and some others define FSCALE in sys/param.h. */
291 # define FSCALE 2048.0
294 # if defined(MIPS) || defined(SVR4) || defined(decstation)
298 # if defined (sgi) || defined (sequent)
299 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
300 above under #ifdef MIPS. But we want the sgi value. */
302 # define FSCALE 1000.0
305 # if defined (ardent) && defined (titan)
306 # define FSCALE 65536.0
310 # define FSCALE 100.0
314 # define FSCALE 65536.0
317 # endif /* Not FSCALE. */
319 # if !defined (LDAV_CVT) && defined (FSCALE)
320 # define LDAV_CVT(n) (((double) (n)) / FSCALE)
324 # if defined(sgi) || (defined(mips) && !defined(BSD))
325 # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
329 # if !defined (KERNEL_FILE) && defined (sequent)
330 # define KERNEL_FILE "/dynix"
333 # if !defined (KERNEL_FILE) && defined (hpux)
334 # define KERNEL_FILE "/hp-ux"
337 # if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan)))
338 # define KERNEL_FILE "/unix"
342 # if !defined (LDAV_SYMBOL) && defined (alliant)
343 # define LDAV_SYMBOL "_Loadavg"
346 # if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
347 # define LDAV_SYMBOL "avenrun"
350 # ifdef HAVE_UNISTD_H
356 /* LOAD_AVE_TYPE should only get defined if we're going to use the
358 # if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
359 # define LOAD_AVE_TYPE double
362 # ifdef LOAD_AVE_TYPE
378 # if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
379 # include <sys/pstat.h>
383 # define KERNEL_FILE "/vmunix"
384 # endif /* KERNEL_FILE */
387 # define LDAV_SYMBOL "_avenrun"
388 # endif /* LDAV_SYMBOL */
389 # endif /* __linux__ */
395 # include <descrip.h>
397 # include <vms/iodef.h>
402 # define LDAV_CVT(n) ((double) (n))
403 # endif /* !LDAV_CVT */
405 # endif /* LOAD_AVE_TYPE */
407 # if defined(__GNU__) && !defined (NeXT)
408 /* Note that NeXT Openstep defines __GNU__ even though it should not. */
409 /* GNU system acts much like NeXT, for load average purposes,
412 # define host_self mach_host_self
416 # ifdef HAVE_MACH_MACH_H
417 # include <mach/mach.h>
424 # include <sys/sysmp.h>
430 # include <sys/time.h>
431 # include <sys/wait.h>
432 # include <sys/syscall.h>
435 # include <machine/cpu.h>
436 # include <inq_stats/statistics.h>
437 # include <inq_stats/sysstats.h>
438 # include <inq_stats/cpustats.h>
439 # include <inq_stats/procstats.h>
440 # else /* Not UMAX_43. */
441 # include <sys/sysdefs.h>
442 # include <sys/statistics.h>
443 # include <sys/sysstats.h>
444 # include <sys/cpudefs.h>
445 # include <sys/cpustats.h>
446 # include <sys/procstats.h>
447 # endif /* Not UMAX_43. */
451 # include <sys/dg_sys_info.h>
454 # if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
457 # include <sys/file.h>
461 /* Avoid static vars inside a function since in HPUX they dump as pure. */
464 static processor_set_t default_set
;
465 static int getloadavg_initialized
;
469 static unsigned int cpus
= 0;
470 static unsigned int samples
;
474 static struct dg_sys_info_load_info load_info
; /* what-a-mouthful! */
477 #if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE)
478 /* File descriptor open to /dev/kmem or VMS load ave driver. */
480 /* Nonzero iff channel is valid. */
481 static int getloadavg_initialized
;
482 /* Offset in kmem to seek to read load average, or 0 means invalid. */
485 #if !defined(VMS) && !defined(sgi) && !defined(__linux__)
486 static struct nlist nl
[2];
487 #endif /* Not VMS or sgi */
493 #endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */
495 /* Put the 1 minute, 5 minute and 15 minute load averages
496 into the first NELEM elements of LOADAVG.
497 Return the number written (never more than 3, but may be less than NELEM),
498 or -1 if an error occurred. */
501 getloadavg (double loadavg
[], int nelem
)
503 int elem
= 0; /* Return value. */
505 # ifdef NO_GET_LOAD_AVG
507 /* Set errno to zero to indicate that there was no particular error;
508 this function just can't work at all on this system. */
513 # if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
514 /* Use libkstat because we don't have to be root. */
523 ksp
= kstat_lookup (kc
, "unix", 0, "system_misc");
526 if (kstat_read (kc
, ksp
, 0) == -1)
530 kn
= kstat_data_lookup (ksp
, "avenrun_1min");
533 /* Return -1 if no load average information is available. */
539 loadavg
[elem
++] = (double) kn
->value
.ul
/FSCALE
;
543 kn
= kstat_data_lookup (ksp
, "avenrun_5min");
546 loadavg
[elem
++] = (double) kn
->value
.ul
/FSCALE
;
550 kn
= kstat_data_lookup (ksp
, "avenrun_15min");
552 loadavg
[elem
++] = (double) kn
->value
.ul
/FSCALE
;
558 # endif /* HAVE_LIBKSTAT */
560 # if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
561 /* Use pstat_getdynamic() because we don't have to be root. */
563 # undef LOAD_AVE_TYPE
565 struct pst_dynamic dyn_info
;
566 if (pstat_getdynamic (&dyn_info
, sizeof (dyn_info
), 0, 0) < 0)
569 loadavg
[elem
++] = dyn_info
.psd_avg_1_min
;
571 loadavg
[elem
++] = dyn_info
.psd_avg_5_min
;
573 loadavg
[elem
++] = dyn_info
.psd_avg_15_min
;
575 # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
577 # if !defined (LDAV_DONE) && defined (__linux__)
579 # undef LOAD_AVE_TYPE
581 # ifndef LINUX_LDAV_FILE
582 # define LINUX_LDAV_FILE "/proc/loadavg"
589 fd
= open (LINUX_LDAV_FILE
, O_RDONLY
);
592 count
= read (fd
, ldavgbuf
, 40);
597 /* The following sscanf must use the C locale. */
598 setlocale (LC_NUMERIC
, "C");
599 count
= sscanf (ldavgbuf
, "%lf %lf %lf",
600 &load_ave
[0], &load_ave
[1], &load_ave
[2]);
601 setlocale (LC_NUMERIC
, "");
605 for (elem
= 0; elem
< nelem
&& elem
< count
; elem
++)
606 loadavg
[elem
] = load_ave
[elem
];
610 # endif /* __linux__ */
612 # if !defined (LDAV_DONE) && defined (__NetBSD__)
614 # undef LOAD_AVE_TYPE
616 # ifndef NETBSD_LDAV_FILE
617 # define NETBSD_LDAV_FILE "/kern/loadavg"
620 unsigned long int load_ave
[3], scale
;
624 fp
= fopen (NETBSD_LDAV_FILE
, "r");
627 count
= fscanf (fp
, "%lu %lu %lu %lu\n",
628 &load_ave
[0], &load_ave
[1], &load_ave
[2],
634 for (elem
= 0; elem
< nelem
; elem
++)
635 loadavg
[elem
] = (double) load_ave
[elem
] / (double) scale
;
639 # endif /* __NetBSD__ */
641 # if !defined (LDAV_DONE) && defined (NeXT)
643 /* The NeXT code was adapted from iscreen 3.2. */
646 struct processor_set_basic_info info
;
649 /* We only know how to get the 1-minute average for this system,
650 so even if the caller asks for more than 1, we only return 1. */
652 if (!getloadavg_initialized
)
654 if (processor_set_default (host_self (), &default_set
) == KERN_SUCCESS
)
655 getloadavg_initialized
= 1;
658 if (getloadavg_initialized
)
660 info_count
= PROCESSOR_SET_BASIC_INFO_COUNT
;
661 if (processor_set_info (default_set
, PROCESSOR_SET_BASIC_INFO
, &host
,
662 (processor_set_info_t
) &info
, &info_count
)
664 getloadavg_initialized
= 0;
668 loadavg
[elem
++] = (double) info
.load_average
/ LOAD_SCALE
;
672 if (!getloadavg_initialized
)
676 # if !defined (LDAV_DONE) && defined (UMAX)
678 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
679 have a /dev/kmem. Information about the workings of the running kernel
680 can be gathered with inq_stats system calls.
681 We only know how to get the 1-minute average for this system. */
683 struct proc_summary proc_sum_data
;
684 struct stat_descr proc_info
;
686 register unsigned int i
, j
;
690 register unsigned int c
, i
;
691 struct cpu_config conf
;
692 struct stat_descr desc
;
695 desc
.sd_subsys
= SUBSYS_CPU
;
696 desc
.sd_type
= CPUTYPE_CONFIG
;
697 desc
.sd_addr
= (char *) &conf
;
698 desc
.sd_size
= sizeof conf
;
700 if (inq_stats (1, &desc
))
704 for (i
= 0; i
< conf
.config_maxclass
; ++i
)
706 struct class_stats stats
;
707 bzero ((char *) &stats
, sizeof stats
);
709 desc
.sd_type
= CPUTYPE_CLASS
;
711 desc
.sd_addr
= (char *) &stats
;
712 desc
.sd_size
= sizeof stats
;
714 if (inq_stats (1, &desc
))
717 c
+= stats
.class_numcpus
;
720 samples
= cpus
< 2 ? 3 : (2 * cpus
/ 3);
723 proc_info
.sd_next
= 0;
724 proc_info
.sd_subsys
= SUBSYS_PROC
;
725 proc_info
.sd_type
= PROCTYPE_SUMMARY
;
726 proc_info
.sd_addr
= (char *) &proc_sum_data
;
727 proc_info
.sd_size
= sizeof (struct proc_summary
);
728 proc_info
.sd_sizeused
= 0;
730 if (inq_stats (1, &proc_info
) != 0)
733 load
= proc_sum_data
.ps_nrunnable
;
735 for (i
= samples
- 1; i
> 0; --i
)
737 load
+= proc_sum_data
.ps_nrun
[j
];
738 if (j
++ == PS_NRUNSIZE
)
743 loadavg
[elem
++] = load
/ samples
/ cpus
;
746 # if !defined (LDAV_DONE) && defined (DGUX)
748 /* This call can return -1 for an error, but with good args
749 it's not supposed to fail. The first argument is for no
750 apparent reason of type `long int *'. */
751 dg_sys_info ((long int *) &load_info
,
752 DG_SYS_INFO_LOAD_INFO_TYPE
,
753 DG_SYS_INFO_LOAD_VERSION_0
);
756 loadavg
[elem
++] = load_info
.one_minute
;
758 loadavg
[elem
++] = load_info
.five_minute
;
760 loadavg
[elem
++] = load_info
.fifteen_minute
;
763 # if !defined (LDAV_DONE) && defined (apollo)
765 /* Apollo code from lisch@mentorg.com (Ray Lischner).
767 This system call is not documented. The load average is obtained as
768 three long integers, for the load average over the past minute,
769 five minutes, and fifteen minutes. Each value is a scaled integer,
770 with 16 bits of integer part and 16 bits of fraction part.
772 I'm not sure which operating system first supported this system call,
773 but I know that SR10.2 supports it. */
775 extern void proc1_$
get_loadav ();
776 unsigned long load_ave
[3];
778 proc1_$
get_loadav (load_ave
);
781 loadavg
[elem
++] = load_ave
[0] / 65536.0;
783 loadavg
[elem
++] = load_ave
[1] / 65536.0;
785 loadavg
[elem
++] = load_ave
[2] / 65536.0;
788 # if !defined (LDAV_DONE) && defined (OSF_MIPS)
791 struct tbl_loadavg load_ave
;
792 table (TBL_LOADAVG
, 0, &load_ave
, 1, sizeof (load_ave
));
794 = (load_ave
.tl_lscale
== 0
795 ? load_ave
.tl_avenrun
.d
[0]
796 : (load_ave
.tl_avenrun
.l
[0] / (double) load_ave
.tl_lscale
));
797 # endif /* OSF_MIPS */
799 # if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
802 /* A faithful emulation is going to have to be saved for a rainy day. */
803 for ( ; elem
< nelem
; elem
++)
807 # endif /* __MSDOS__ || WINDOWS32 */
809 # if !defined (LDAV_DONE) && defined (OSF_ALPHA)
812 struct tbl_loadavg load_ave
;
813 table (TBL_LOADAVG
, 0, &load_ave
, 1, sizeof (load_ave
));
814 for (elem
= 0; elem
< nelem
; elem
++)
816 = (load_ave
.tl_lscale
== 0
817 ? load_ave
.tl_avenrun
.d
[elem
]
818 : (load_ave
.tl_avenrun
.l
[elem
] / (double) load_ave
.tl_lscale
));
819 # endif /* OSF_ALPHA */
821 # if !defined (LDAV_DONE) && defined (VMS)
822 /* VMS specific code -- read from the Load Ave driver. */
824 LOAD_AVE_TYPE load_ave
[3];
825 static int getloadavg_initialized
= 0;
834 /* Ensure that there is a channel open to the load ave device. */
835 if (!getloadavg_initialized
)
837 /* Attempt to open the channel. */
839 descriptor
.dsc$w_length
= 18;
840 descriptor
.dsc$a_pointer
= "$$VMS_LOAD_AVERAGE";
842 $
DESCRIPTOR (descriptor
, "LAV0:");
844 if (sys$
assign (&descriptor
, &channel
, 0, 0) & 1)
845 getloadavg_initialized
= 1;
848 /* Read the load average vector. */
849 if (getloadavg_initialized
850 && !(sys$
qiow (0, channel
, IO$_READVBLK
, 0, 0, 0,
851 load_ave
, 12, 0, 0, 0, 0) & 1))
853 sys$
dassgn (channel
);
854 getloadavg_initialized
= 0;
857 if (!getloadavg_initialized
)
861 # if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
863 /* UNIX-specific code -- read the average from /dev/kmem. */
865 # define LDAV_PRIVILEGED /* This code requires special installation. */
867 LOAD_AVE_TYPE load_ave
[3];
869 /* Get the address of LDAV_SYMBOL. */
873 # ifndef NLIST_STRUCT
874 strcpy (nl
[0].n_name
, LDAV_SYMBOL
);
875 strcpy (nl
[1].n_name
, "");
876 # else /* NLIST_STRUCT */
877 # ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
878 nl
[0].n_un
.n_name
= LDAV_SYMBOL
;
879 nl
[1].n_un
.n_name
= 0;
880 # else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
881 nl
[0].n_name
= LDAV_SYMBOL
;
883 # endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */
884 # endif /* NLIST_STRUCT */
888 # if !(defined (_AIX) && !defined (ps2))
889 nlist (KERNEL_FILE
, nl
)
891 knlist (nl
, 1, sizeof (nl
[0]))
894 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
896 # ifdef FIXUP_KERNEL_SYMBOL_ADDR
897 FIXUP_KERNEL_SYMBOL_ADDR (nl
);
899 offset
= nl
[0].n_value
;
901 # endif /* !SUNOS_5 */
905 ldav_off
= sysmp (MP_KERNADDR
, MPKA_AVENRUN
);
907 offset
= (long) ldav_off
& 0x7fffffff;
911 /* Make sure we have /dev/kmem open. */
912 if (!getloadavg_initialized
)
915 channel
= open ("/dev/kmem", 0);
918 /* Set the channel to close on exec, so it does not
919 litter any child's descriptor table. */
922 # define FD_CLOEXEC 1
924 (void) fcntl (channel
, F_SETFD
, FD_CLOEXEC
);
926 getloadavg_initialized
= 1;
929 /* We pass 0 for the kernel, corefile, and swapfile names
930 to use the currently running kernel. */
931 kd
= kvm_open (0, 0, 0, O_RDONLY
, 0);
934 /* nlist the currently running kernel. */
936 offset
= nl
[0].n_value
;
937 getloadavg_initialized
= 1;
939 # endif /* SUNOS_5 */
942 /* If we can, get the load average values. */
943 if (offset
&& getloadavg_initialized
)
945 /* Try to read the load. */
947 if (lseek (channel
, offset
, 0) == -1L
948 || read (channel
, (char *) load_ave
, sizeof (load_ave
))
949 != sizeof (load_ave
))
952 getloadavg_initialized
= 0;
955 if (kvm_read (kd
, offset
, (char *) load_ave
, sizeof (load_ave
))
956 != sizeof (load_ave
))
959 getloadavg_initialized
= 0;
961 # endif /* SUNOS_5 */
964 if (offset
== 0 || !getloadavg_initialized
)
966 # endif /* LOAD_AVE_TYPE and not VMS */
968 # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
970 loadavg
[elem
++] = LDAV_CVT (load_ave
[0]);
972 loadavg
[elem
++] = LDAV_CVT (load_ave
[1]);
974 loadavg
[elem
++] = LDAV_CVT (load_ave
[2]);
977 # endif /* !LDAV_DONE && LOAD_AVE_TYPE */
982 /* Set errno to zero to indicate that there was no particular error;
983 this function just can't work at all on this system. */
989 #endif /* ! HAVE_GETLOADAVG */
995 main (int argc
, char **argv
)
1000 naptime
= atoi (argv
[1]);
1007 errno
= 0; /* Don't be misled if it doesn't set errno. */
1008 loads
= getloadavg (avg
, 3);
1011 perror ("Error getting load average");
1015 printf ("1-minute: %f ", avg
[0]);
1017 printf ("5-minute: %f ", avg
[1]);
1019 printf ("15-minute: %f ", avg
[2]);