1 /* Get the system load averages.
2 Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995
3 Free Software Foundation, Inc.
5 This file is part of XEmacs.
7 XEmacs is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with XEmacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Compile-time symbols that this file uses:
24 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
25 KERNEL_FILE Pathname of the kernel to nlist.
26 LDAV_CVT() Scale the load average from the kernel.
28 LDAV_SYMBOL Name of kernel symbol giving load average.
29 LOAD_AVE_TYPE Type of the load average array in the kernel.
30 Must be defined unless one of
31 apollo, DGUX, NeXT, or UMAX is defined;
32 otherwise, no load average is available.
33 NLIST_STRUCT Include nlist.h, not a.out.h, and
34 the nlist n_name element is a pointer,
36 NLIST_NAME_UNION struct nlist has an n_un member, not n_name.
37 LINUX_LDAV_FILE [__linux__]: File containing load averages.
39 Specific system predefines this file uses, aside from setting
40 default values if not emacs:
43 BSD Real BSD, not just BSD-like.
49 sequent Sequent Dynix 3.x.x (BSD)
50 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
51 sony_news NEWS-OS (works at least for 4.1C)
54 WIN32_NATIVE No-op for Windows95/NT.
55 __linux__ Linux: assumes /proc filesystem mounted.
56 Support from Michael K. Johnson.
57 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
58 __OpenBSD__ OpenBSD: ditto.
60 In addition, to avoid nesting many #ifdefs, we internally set
61 LDAV_DONE to indicate that the load average has been computed.
63 We also #define LDAV_PRIVILEGED if a program will require
64 special installation to be able to call getloadavg. */
66 /* This should always be first. */
72 #include "sysfile.h" /* for encapsulated open, close, read, write */
77 #include <sys/types.h>
79 /* Both the Emacs and non-Emacs sections want this. Some
80 configuration files' definitions for the LOAD_AVE_CVT macro (like
81 sparc.h's) use macros like FSCALE, defined here. */
83 #include <sys/param.h>
87 /* Exclude all the code except the test program at the end
88 if the system has its own `getloadavg' function.
90 The declaration of `errno' is needed by the test program
91 as well as the function itself, so it comes first. */
95 #ifndef HAVE_GETLOADAVG
97 /* The existing Emacs configuration files define a macro called
98 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
99 returns the load average multiplied by 100. What we actually want
100 is a macro called LDAV_CVT, which returns the load average as an
103 For backwards compatibility, we'll define LDAV_CVT in terms of
104 LOAD_AVE_CVT, but future machine config files should just define
105 LDAV_CVT directly. */
107 #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
108 #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
111 #if defined (HAVE_KSTAT_H)
113 #endif /* HAVE_KSTAT_H */
115 #if !defined (BSD) && defined (ultrix)
116 /* Ultrix behaves like BSD on Vaxen. */
121 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
122 conflicts with the definition understood in this file, that this
126 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
127 defined to mean that the nlist method should be used, which is not true. */
131 /* Set values that are different from the defaults, which are
132 set a little farther down with #ifndef. */
135 /* Some shorthands. */
137 #if defined (HPUX) && !defined (hpux)
141 #if defined(hp300) && !defined(hpux)
145 #if defined(ultrix) && defined(mips)
149 #if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
153 #if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
156 #include <netinet/in.h> /* Needed for Digital UNIX V3 */
157 #include <net/proto_net.h>
158 #include <sys/table.h>
161 #if defined (__osf__) && (defined (mips) || defined (__mips__))
163 #include <sys/table.h>
166 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
167 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
168 that with a couple of other things and we'll have a unique match. */
169 #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
170 #define tek4300 /* Define by emacs, but not by other users. */
174 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
175 #ifndef LOAD_AVE_TYPE
178 #define LOAD_AVE_TYPE long
182 #define LOAD_AVE_TYPE long
186 #define LOAD_AVE_TYPE long
190 #define LOAD_AVE_TYPE long
194 #define LOAD_AVE_TYPE long
198 #define LOAD_AVE_TYPE long
202 #define LOAD_AVE_TYPE long
206 #define LOAD_AVE_TYPE long
210 #define LOAD_AVE_TYPE long
213 #if defined (ardent) && defined (titan)
214 #define LOAD_AVE_TYPE long
218 #define LOAD_AVE_TYPE long
221 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
222 #define LOAD_AVE_TYPE long
226 #define LOAD_AVE_TYPE long
230 #define LOAD_AVE_TYPE double
232 #define LDAV_CVT(n) (n)
236 #endif /* No LOAD_AVE_TYPE. */
239 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
240 according to ghazi@noc.rutgers.edu. */
242 #define FSCALE 1024.0
245 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
246 /* <sys/param.h> defines an incorrect value for FSCALE on an
247 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
255 /* SunOS and some others define FSCALE in sys/param.h. */
258 #define FSCALE 2048.0
261 #if defined(MIPS) || defined(SVR4) || defined(decstation)
265 #if defined (sgi) || defined (sequent)
266 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
267 above under #ifdef MIPS. But we want the sgi value. */
269 #define FSCALE 1000.0
272 #if defined (ardent) && defined (titan)
273 #define FSCALE 65536.0
281 #define FSCALE 65536.0
284 #endif /* Not FSCALE. */
286 #if !defined (LDAV_CVT) && defined (FSCALE)
287 #define LDAV_CVT(n) (((double) (n)) / FSCALE)
290 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
309 #if defined (_SEQUENT_) || defined (sequent)
329 #if defined (ardent) && defined (titan)
341 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
349 #endif /* defined (NLIST_STRUCT) */
352 #if defined(sgi) || (defined(mips) && !defined(BSD))
353 #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
357 #if !defined (KERNEL_FILE) && defined (sequent)
358 #define KERNEL_FILE "/dynix"
361 #if !defined (KERNEL_FILE) && defined (hpux)
362 #define KERNEL_FILE "/hp-ux"
365 #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
366 #define KERNEL_FILE "/unix"
370 #if !defined (LDAV_SYMBOL) && defined (alliant)
371 #define LDAV_SYMBOL "_Loadavg"
374 #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
375 #define LDAV_SYMBOL "avenrun"
384 /* LOAD_AVE_TYPE should only get defined if we're going to use the
386 #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
387 #define LOAD_AVE_TYPE double
394 #else /* NLIST_STRUCT */
396 #endif /* NLIST_STRUCT */
404 #define KERNEL_FILE "/vmunix"
405 #endif /* KERNEL_FILE */
408 #define LDAV_SYMBOL "_avenrun"
409 #endif /* LDAV_SYMBOL */
412 #define LDAV_CVT(n) ((double) (n))
413 #endif /* !LDAV_CVT */
415 #endif /* LOAD_AVE_TYPE */
418 #ifdef HAVE_MACH_MACH_H
419 #include <mach/mach.h>
426 #include <sys/sysmp.h>
432 #include <sys/time.h>
433 #include <sys/wait.h>
434 #include <sys/syscall.h>
437 #include <machine/cpu.h>
438 #include <inq_stats/statistics.h>
439 #include <inq_stats/sysstats.h>
440 #include <inq_stats/cpustats.h>
441 #include <inq_stats/procstats.h>
442 #else /* Not UMAX_43. */
443 #include <sys/sysdefs.h>
444 #include <sys/statistics.h>
445 #include <sys/sysstats.h>
446 #include <sys/cpudefs.h>
447 #include <sys/cpustats.h>
448 #include <sys/procstats.h>
449 #endif /* Not UMAX_43. */
453 #include <sys/dg_sys_info.h>
456 #if defined (HAVE_SYS_PSTAT_H)
457 #include <sys/pstat.h>
458 #endif /* HAVE_SYS_PSTAT_H (on HPUX) */
460 #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
463 #include <sys/file.h>
466 /* Avoid static vars inside a function since in HPUX they dump as pure. */
469 static processor_set_t default_set;
470 static int getloadavg_initialized;
474 static unsigned int cpus = 0;
475 static unsigned int samples;
479 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
483 /* File descriptor open to /dev/kmem */
485 /* Nonzero iff channel is valid. */
486 static int getloadavg_initialized;
487 /* Offset in kmem to seek to read load average, or 0 means invalid. */
491 static struct nlist nl[2];
499 # define countof(x) (sizeof (x) / sizeof (*(x)))
502 #endif /* LOAD_AVE_TYPE */
504 /* Put the 1 minute, 5 minute and 15 minute load averages
505 into the first NELEM elements of LOADAVG.
506 Return the number written (never more than 3, but may be less than NELEM),
507 or -1 if an error occurred. */
510 getloadavg (double loadavg[], int nelem)
512 int elem = 0; /* Return value. */
514 #ifdef NO_GET_LOAD_AVG
516 /* Set errno to zero to indicate that there was no particular error;
517 this function just can't work at all on this system. */
520 #endif /* NO_GET_LOAD_AVG */
522 #if ! defined (LDAV_DONE) && defined (HAVE_KSTAT_H) && defined (HAVE_LIBKSTAT)
524 /* getloadavg is best implemented using kstat (kernel stats), on
525 systems (like SunOS5) that support it, since you don't need special
526 privileges to use it.
528 Initial implementation courtesy Zlatko Calusic <zcalusic@carnet.hr>.
529 Integrated to XEmacs by Hrvoje Niksic <hniksic@xemacs.org>.
530 Additional cleanup by Hrvoje Niksic, based on code published by
531 Casper Dik <Casper.Dik@Holland.Sun.Com>. */
534 static char *avestrings[] = { "avenrun_1min",
538 if (nelem > countof (avestrings))
539 nelem = countof (avestrings);
544 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
550 if (kstat_read (kc, ksp, 0) < 0)
555 for (elem = 0; elem < nelem; elem++)
558 (kstat_named_t *) kstat_data_lookup (ksp, avestrings[elem]);
564 loadavg[elem] = (double)kn->value.ul / FSCALE;
567 #endif /* HAVE_KSTAT_H && HAVE_LIBKSTAT */
569 #if !defined (LDAV_DONE) && defined (HAVE_SYS_PSTAT_H)
571 /* This is totally undocumented, and is not guaranteed to work, but
572 mayhap it might .... If it does work, it will work only on HP-UX
573 8.0 or later. -- Darryl Okahata <darrylo@sr.hp.com> */
574 #undef LOAD_AVE_TYPE /* Make sure these don't exist. */
577 struct pst_dynamic procinfo;
580 statbuf.pst_dynamic = &procinfo;
581 if (pstat (PSTAT_DYNAMIC, statbuf, sizeof (struct pst_dynamic), 0, 0) == -1)
583 loadavg[elem++] = procinfo.psd_avg_1_min;
584 loadavg[elem++] = procinfo.psd_avg_5_min;
585 loadavg[elem++] = procinfo.psd_avg_15_min;
588 #if !defined (LDAV_DONE) && defined (__linux__)
592 #ifndef LINUX_LDAV_FILE
593 #define LINUX_LDAV_FILE "/proc/loadavg"
600 fd = open (LINUX_LDAV_FILE, O_RDONLY);
603 count = read (fd, ldavgbuf, 40);
608 count = sscanf (ldavgbuf, "%lf %lf %lf",
609 &load_ave[0], &load_ave[1], &load_ave[2]);
613 for (elem = 0; elem < nelem && elem < count; elem++)
614 loadavg[elem] = load_ave[elem];
615 #endif /* __linux__ */
617 #if !defined (LDAV_DONE) && defined (__NetBSD__) || defined (__OpenBSD__)
621 #ifndef NETBSD_LDAV_FILE
622 #define NETBSD_LDAV_FILE "/kern/loadavg"
625 unsigned long int load_ave[3], scale;
629 fp = fopen (NETBSD_LDAV_FILE, "r");
632 count = fscanf (fp, "%lu %lu %lu %lu\n",
633 &load_ave[0], &load_ave[1], &load_ave[2],
639 for (elem = 0; elem < nelem; elem++)
640 loadavg[elem] = (double) load_ave[elem] / (double) scale;
641 #endif /* __NetBSD__ or __OpenBSD__ */
643 #if !defined (LDAV_DONE) && defined (NeXT)
645 /* The NeXT code was adapted from iscreen 3.2. */
648 struct processor_set_basic_info info;
651 /* We only know how to get the 1-minute average for this system,
652 so even if the caller asks for more than 1, we only return 1. */
654 if (!getloadavg_initialized)
656 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
657 getloadavg_initialized = 1;
660 if (getloadavg_initialized)
662 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
663 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
664 (processor_set_info_t) &info, &info_count)
666 getloadavg_initialized = 0;
670 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
674 if (!getloadavg_initialized)
678 #if !defined (LDAV_DONE) && defined (UMAX)
680 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
681 have a /dev/kmem. Information about the workings of the running kernel
682 can be gathered with inq_stats system calls.
683 We only know how to get the 1-minute average for this system. */
685 struct proc_summary proc_sum_data;
686 struct stat_descr proc_info;
688 REGISTER unsigned int i, j;
692 REGISTER unsigned int c, i;
693 struct cpu_config conf;
694 struct stat_descr desc;
697 desc.sd_subsys = SUBSYS_CPU;
698 desc.sd_type = CPUTYPE_CONFIG;
699 desc.sd_addr = (char *) &conf;
700 desc.sd_size = sizeof conf;
702 if (inq_stats (1, &desc))
706 for (i = 0; i < conf.config_maxclass; ++i)
708 struct class_stats stats;
709 memset ((char *) &stats, 0, sizeof stats);
711 desc.sd_type = CPUTYPE_CLASS;
713 desc.sd_addr = (char *) &stats;
714 desc.sd_size = sizeof stats;
716 if (inq_stats (1, &desc))
719 c += stats.class_numcpus;
722 samples = cpus < 2 ? 3 : (2 * cpus / 3);
725 proc_info.sd_next = 0;
726 proc_info.sd_subsys = SUBSYS_PROC;
727 proc_info.sd_type = PROCTYPE_SUMMARY;
728 proc_info.sd_addr = (char *) &proc_sum_data;
729 proc_info.sd_size = sizeof (struct proc_summary);
730 proc_info.sd_sizeused = 0;
732 if (inq_stats (1, &proc_info) != 0)
735 load = proc_sum_data.ps_nrunnable;
737 for (i = samples - 1; i > 0; --i)
739 load += proc_sum_data.ps_nrun[j];
740 if (j++ == PS_NRUNSIZE)
745 loadavg[elem++] = load / samples / cpus;
748 #if !defined (LDAV_DONE) && defined (DGUX)
750 /* This call can return -1 for an error, but with good args
751 it's not supposed to fail. The first argument is for no
752 apparent reason of type `long int *'. */
753 dg_sys_info ((long int *) &load_info,
754 DG_SYS_INFO_LOAD_INFO_TYPE,
755 DG_SYS_INFO_LOAD_VERSION_0);
758 loadavg[elem++] = load_info.one_minute;
760 loadavg[elem++] = load_info.five_minute;
762 loadavg[elem++] = load_info.fifteen_minute;
765 #if !defined (LDAV_DONE) && defined (OSF_MIPS)
768 struct tbl_loadavg load_ave;
769 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
771 = (load_ave.tl_lscale == 0
772 ? load_ave.tl_avenrun.d[0]
773 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
774 #endif /* OSF_MIPS */
776 #if !defined (LDAV_DONE) && defined (WIN32_NATIVE)
779 /* A faithful emulation is going to have to be saved for a rainy day. */
780 for ( ; elem < nelem; elem++)
784 #endif /* WIN32_NATIVE */
786 #if !defined (LDAV_DONE) && defined (OSF_ALPHA)
789 struct tbl_loadavg load_ave;
790 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
791 for (elem = 0; elem < nelem; elem++)
793 = (load_ave.tl_lscale == 0
794 ? load_ave.tl_avenrun.d[elem]
795 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
796 #endif /* OSF_ALPHA */
798 #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE)
800 /* UNIX-specific code -- read the average from /dev/kmem. */
802 #define LDAV_PRIVILEGED /* This code requires special installation. */
804 LOAD_AVE_TYPE load_ave[3];
806 /* Get the address of LDAV_SYMBOL. */
811 strcpy (nl[0].n_name, LDAV_SYMBOL);
812 strcpy (nl[1].n_name, "");
813 #else /* NLIST_STRUCT */
814 #ifdef NLIST_NAME_UNION
815 nl[0].n_un.n_name = LDAV_SYMBOL;
816 nl[1].n_un.n_name = 0;
817 #else /* not NLIST_NAME_UNION */
818 nl[0].n_name = (char *) LDAV_SYMBOL;
820 #endif /* not NLIST_NAME_UNION */
821 #endif /* NLIST_STRUCT */
825 #if !(defined (_AIX) && !defined (ps2))
826 nlist (KERNEL_FILE, nl)
828 knlist (nl, 1, sizeof (nl[0]))
831 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
833 #ifdef FIXUP_KERNEL_SYMBOL_ADDR
834 FIXUP_KERNEL_SYMBOL_ADDR (nl);
836 offset = nl[0].n_value;
838 #endif /* !SUNOS_5 */
842 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
844 offset = (long) ldav_off & 0x7fffffff;
848 /* Make sure we have /dev/kmem open. */
849 if (!getloadavg_initialized)
852 channel = open ("/dev/kmem", 0);
855 /* Set the channel to close on exec, so it does not
856 litter any child's descriptor table. */
861 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
863 getloadavg_initialized = 1;
866 /* We pass 0 for the kernel, corefile, and swapfile names
867 to use the currently running kernel. */
868 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
871 /* nlist the currently running kernel. */
873 offset = nl[0].n_value;
874 getloadavg_initialized = 1;
879 /* If we can, get the load average values. */
880 if (offset && getloadavg_initialized)
882 /* Try to read the load. */
884 if (lseek (channel, offset, 0) == -1L
885 || read (channel, (char *) load_ave, sizeof (load_ave))
886 != sizeof (load_ave))
889 getloadavg_initialized = 0;
892 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
893 != sizeof (load_ave))
896 getloadavg_initialized = 0;
901 if (offset == 0 || !getloadavg_initialized)
905 loadavg[elem++] = LDAV_CVT (load_ave[0]);
907 loadavg[elem++] = LDAV_CVT (load_ave[1]);
909 loadavg[elem++] = LDAV_CVT (load_ave[2]);
912 #endif /* !LDAV_DONE && LOAD_AVE_TYPE */
917 #endif /* ! HAVE_GETLOADAVG */
921 main (int argc, char **argv)
926 naptime = atoi (argv[1]);
933 errno = 0; /* Don't be misled if it doesn't set errno. */
934 loads = getloadavg (avg, 3);
937 perror ("Error getting load average");
941 printf ("1-minute: %f ", avg[0]);
943 printf ("5-minute: %f ", avg[1]);
945 printf ("15-minute: %f ", avg[2]);
960 /* Emulate getloadavg. */
962 getloadavg (double loadavg[], int nelem)
966 /* A faithful emulation is going to have to be saved for a rainy day. */
967 for (i = 0; i < nelem; i++)
974 #endif /*__GNUWIN32__*/
975 #endif /* WIN32_NATIVE */