| /* Get the system load averages. |
| Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995 |
| Free Software Foundation, Inc. |
| |
| 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. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| |
| /* Compile-time symbols that this file uses: |
| |
| FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist. |
| KERNEL_FILE Pathname of the kernel 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; |
| otherwise, no load average is available. |
| NLIST_STRUCT Include nlist.h, not a.out.h, and |
| the nlist n_name element is a pointer, |
| not an array. |
| NLIST_NAME_UNION struct nlist has an n_un member, not n_name. |
| LINUX_LDAV_FILE [__linux__]: File containing load averages. |
| |
| Specific system predefines this file uses, aside from setting |
| default values if not emacs: |
| |
| apollo |
| BSD Real BSD, not just BSD-like. |
| DGUX |
| eunice UNIX emulator under VMS. |
| hpux |
| NeXT |
| sgi |
| sequent Sequent Dynix 3.x.x (BSD) |
| _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV) |
| sony_news NEWS-OS (works at least for 4.1C) |
| UMAX |
| UMAX4_3 |
| VMS |
| __linux__ Linux: assumes /proc filesystem mounted. |
| Support from Michael K. Johnson. |
| __NetBSD__ NetBSD: assumes /kern filesystem 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> |
| |
| /* 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> |
| #endif |
| |
| |
| /* 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. */ |
| |
| #include <errno.h> |
| |
| #ifndef errno |
| extern int errno; |
| #endif |
| |
| #ifndef HAVE_GETLOADAVG |
| |
| |
| /* 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 |
| #endif |
| |
| #ifdef NeXT |
| /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which |
| conflicts with the definition understood in this file, that this |
| really is BSD. */ |
| #undef BSD |
| |
| /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being |
| defined to mean that the nlist method should be used, which is not true. */ |
| #undef FSCALE |
| #endif |
| |
| /* Set values that are different from the defaults, which are |
| set a little farther down with #ifndef. */ |
| |
| |
| /* Some shorthands. */ |
| |
| #if defined (HPUX) && !defined (hpux) |
| #define hpux |
| #endif |
| |
| #if defined(hp300) && !defined(hpux) |
| #define MORE_BSD |
| #endif |
| |
| #if defined(ultrix) && defined(mips) |
| #define decstation |
| #endif |
| |
| #if defined(sun) && defined(SVR4) |
| #define SUNOS_5 |
| #endif |
| |
| #if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) |
| #define OSF_ALPHA |
| #include <sys/table.h> |
| #endif |
| |
| #if defined (__osf__) && (defined (mips) || defined (__mips__)) |
| #define OSF_MIPS |
| #include <sys/table.h> |
| #endif |
| |
| /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by |
| default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine |
| that with a couple of other things and we'll have a unique match. */ |
| #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES) |
| #define tek4300 /* Define by emacs, but not by other users. */ |
| #endif |
| |
| |
| /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */ |
| #ifndef LOAD_AVE_TYPE |
| |
| #ifdef MORE_BSD |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef sun |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef decstation |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef _SEQUENT_ |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef sgi |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef SVR4 |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef sony_news |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef sequent |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef OSF_ALPHA |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #if defined (ardent) && defined (titan) |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #ifdef tek4300 |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #if defined(alliant) && defined(i860) /* Alliant FX/2800 */ |
| #define LOAD_AVE_TYPE long |
| #endif |
| |
| #endif /* No LOAD_AVE_TYPE. */ |
| |
| #ifdef OSF_ALPHA |
| /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1, |
| according to ghazi@noc.rutgers.edu. */ |
| #undef FSCALE |
| #define FSCALE 1024.0 |
| #endif |
| |
| #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 |
| #define FSCALE 100.0 |
| #endif |
| |
| |
| #ifndef FSCALE |
| |
| /* SunOS and some others define FSCALE in sys/param.h. */ |
| |
| #ifdef MORE_BSD |
| #define FSCALE 2048.0 |
| #endif |
| |
| #if defined(MIPS) || defined(SVR4) || defined(decstation) |
| #define FSCALE 256 |
| #endif |
| |
| #if defined (sgi) || defined (sequent) |
| /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined |
| above under #ifdef MIPS. But we want the sgi value. */ |
| #undef FSCALE |
| #define FSCALE 1000.0 |
| #endif |
| |
| #if defined (ardent) && defined (titan) |
| #define FSCALE 65536.0 |
| #endif |
| |
| #ifdef tek4300 |
| #define FSCALE 100.0 |
| #endif |
| |
| #endif /* Not FSCALE. */ |
| |
| #if !defined (LDAV_CVT) && defined (FSCALE) |
| #define LDAV_CVT(n) (((double) (n)) / FSCALE) |
| #endif |
| |
| /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */ |
| #ifndef NLIST_STRUCT |
| |
| #ifdef MORE_BSD |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef sun |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef decstation |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef hpux |
| #define NLIST_STRUCT |
| #endif |
| |
| #if defined (_SEQUENT_) || defined (sequent) |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef sgi |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef SVR4 |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef sony_news |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef OSF_ALPHA |
| #define NLIST_STRUCT |
| #endif |
| |
| #if defined (ardent) && defined (titan) |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef tek4300 |
| #define NLIST_STRUCT |
| #endif |
| |
| #ifdef butterfly |
| #define NLIST_STRUCT |
| #endif |
| |
| #if defined(alliant) && defined(i860) /* Alliant FX/2800 */ |
| #define NLIST_STRUCT |
| #endif |
| |
| #endif /* defined (NLIST_STRUCT) */ |
| |
| |
| #if defined(sgi) || (defined(mips) && !defined(BSD)) |
| #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) |
| #endif |
| |
| |
| #if !defined (KERNEL_FILE) && defined (sequent) |
| #define KERNEL_FILE "/dynix" |
| #endif |
| |
| #if !defined (KERNEL_FILE) && defined (hpux) |
| #define KERNEL_FILE "/hp-ux" |
| #endif |
| |
| #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan))) |
| #define KERNEL_FILE "/unix" |
| #endif |
| |
| |
| #if !defined (LDAV_SYMBOL) && defined (alliant) |
| #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))) |
| #define LDAV_SYMBOL "avenrun" |
| #endif |
| |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| |
| #include <stdio.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)) |
| #define LOAD_AVE_TYPE double |
| #endif |
| |
| #ifdef LOAD_AVE_TYPE |
| |
| #ifndef VMS |
| #ifndef NLIST_STRUCT |
| #include <a.out.h> |
| #else /* NLIST_STRUCT */ |
| #include <nlist.h> |
| #endif /* NLIST_STRUCT */ |
| |
| #ifdef SUNOS_5 |
| #include <fcntl.h> |
| #include <kvm.h> |
| #endif |
| |
| #ifndef KERNEL_FILE |
| #define KERNEL_FILE "/vmunix" |
| #endif /* KERNEL_FILE */ |
| |
| #ifndef LDAV_SYMBOL |
| #define LDAV_SYMBOL "_avenrun" |
| #endif /* LDAV_SYMBOL */ |
| |
| #else /* VMS */ |
| |
| #ifndef eunice |
| #include <iodef.h> |
| #include <descrip.h> |
| #else /* eunice */ |
| #include <vms/iodef.h> |
| #endif /* eunice */ |
| #endif /* VMS */ |
| |
| #ifndef LDAV_CVT |
| #define LDAV_CVT(n) ((double) (n)) |
| #endif /* !LDAV_CVT */ |
| |
| #endif /* LOAD_AVE_TYPE */ |
| |
| #ifdef NeXT |
| #ifdef HAVE_MACH_MACH_H |
| #include <mach/mach.h> |
| #else |
| #include <mach.h> |
| #endif |
| #endif /* NeXT */ |
| |
| #ifdef sgi |
| #include <sys/sysmp.h> |
| #endif /* sgi */ |
| |
| #ifdef UMAX |
| #include <stdio.h> |
| #include <signal.h> |
| #include <sys/time.h> |
| #include <sys/wait.h> |
| #include <sys/syscall.h> |
| |
| #ifdef UMAX_43 |
| #include <machine/cpu.h> |
| #include <inq_stats/statistics.h> |
| #include <inq_stats/sysstats.h> |
| #include <inq_stats/cpustats.h> |
| #include <inq_stats/procstats.h> |
| #else /* Not UMAX_43. */ |
| #include <sys/sysdefs.h> |
| #include <sys/statistics.h> |
| #include <sys/sysstats.h> |
| #include <sys/cpudefs.h> |
| #include <sys/cpustats.h> |
| #include <sys/procstats.h> |
| #endif /* Not UMAX_43. */ |
| #endif /* UMAX */ |
| |
| #ifdef DGUX |
| #include <sys/dg_sys_info.h> |
| #endif |
| |
| #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION) |
| #include <fcntl.h> |
| #else |
| #include <sys/file.h> |
| #endif |
| |
| /* 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; |
| #endif /* NeXT */ |
| |
| #ifdef UMAX |
| static unsigned int cpus = 0; |
| static unsigned int samples; |
| #endif /* UMAX */ |
| |
| #ifdef DGUX |
| static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ |
| #endif /* DGUX */ |
| |
| #ifdef 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; |
| /* Offset in kmem to seek to read load average, or 0 means invalid. */ |
| static long offset; |
| |
| #if !defined(VMS) && !defined(sgi) |
| static struct nlist nl[2]; |
| #endif /* Not VMS or sgi */ |
| |
| #ifdef SUNOS_5 |
| static kvm_t *kd; |
| #endif /* SUNOS_5 */ |
| |
| #endif /* LOAD_AVE_TYPE */ |
| |
| /* 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. */ |
| |
| int |
| getloadavg (loadavg, nelem) |
| double loadavg[]; |
| int nelem; |
| { |
| int elem = 0; /* Return value. */ |
| |
| #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; |
| elem = -1; |
| #endif |
| |
| #if !defined (LDAV_DONE) && defined (__linux__) |
| #define LDAV_DONE |
| #undef LOAD_AVE_TYPE |
| |
| #ifndef LINUX_LDAV_FILE |
| #define LINUX_LDAV_FILE "/proc/loadavg" |
| #endif |
| |
| char ldavgbuf[40]; |
| double load_ave[3]; |
| int fd, count; |
| |
| fd = open (LINUX_LDAV_FILE, O_RDONLY); |
| if (fd == -1) |
| return -1; |
| count = read (fd, ldavgbuf, 40); |
| (void) close (fd); |
| if (count <= 0) |
| return -1; |
| |
| count = sscanf (ldavgbuf, "%lf %lf %lf", |
| &load_ave[0], &load_ave[1], &load_ave[2]); |
| if (count < 1) |
| return -1; |
| |
| for (elem = 0; elem < nelem && elem < count; elem++) |
| loadavg[elem] = load_ave[elem]; |
| |
| return elem; |
| |
| #endif /* __linux__ */ |
| |
| #if !defined (LDAV_DONE) && defined (__NetBSD__) |
| #define LDAV_DONE |
| #undef LOAD_AVE_TYPE |
| |
| #ifndef NETBSD_LDAV_FILE |
| #define NETBSD_LDAV_FILE "/kern/loadavg" |
| #endif |
| |
| unsigned long int load_ave[3], scale; |
| int count; |
| FILE *fp; |
| |
| fp = fopen (NETBSD_LDAV_FILE, "r"); |
| if (fp == NULL) |
| return -1; |
| count = fscanf (fp, "%lu %lu %lu %lu\n", |
| &load_ave[0], &load_ave[1], &load_ave[2], |
| &scale); |
| (void) fclose (fp); |
| if (count != 4) |
| return -1; |
| |
| for (elem = 0; elem < nelem; elem++) |
| loadavg[elem] = (double) load_ave[elem] / (double) scale; |
| |
| return elem; |
| |
| #endif /* __NetBSD__ */ |
| |
| #if !defined (LDAV_DONE) && defined (NeXT) |
| #define LDAV_DONE |
| /* The NeXT code was adapted from iscreen 3.2. */ |
| |
| host_t host; |
| struct processor_set_basic_info info; |
| unsigned 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; |
| } |
| |
| if (getloadavg_initialized) |
| { |
| info_count = PROCESSOR_SET_BASIC_INFO_COUNT; |
| if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, |
| (processor_set_info_t) &info, &info_count) |
| != KERN_SUCCESS) |
| getloadavg_initialized = 0; |
| else |
| { |
| if (nelem > 0) |
| loadavg[elem++] = (double) info.load_average / LOAD_SCALE; |
| } |
| } |
| |
| if (!getloadavg_initialized) |
| return -1; |
| #endif /* NeXT */ |
| |
| #if !defined (LDAV_DONE) && defined (UMAX) |
| #define LDAV_DONE |
| /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not |
| have a /dev/kmem. Information about the workings of the running kernel |
| can be gathered with inq_stats system calls. |
| We only know how to get the 1-minute average for this system. */ |
| |
| struct proc_summary proc_sum_data; |
| struct stat_descr proc_info; |
| double load; |
| register unsigned int i, j; |
| |
| if (cpus == 0) |
| { |
| register unsigned int c, i; |
| struct cpu_config conf; |
| struct stat_descr desc; |
| |
| desc.sd_next = 0; |
| desc.sd_subsys = SUBSYS_CPU; |
| desc.sd_type = CPUTYPE_CONFIG; |
| desc.sd_addr = (char *) &conf; |
| desc.sd_size = sizeof conf; |
| |
| if (inq_stats (1, &desc)) |
| return -1; |
| |
| c = 0; |
| for (i = 0; i < conf.config_maxclass; ++i) |
| { |
| struct class_stats stats; |
| bzero ((char *) &stats, sizeof stats); |
| |
| desc.sd_type = CPUTYPE_CLASS; |
| desc.sd_objid = i; |
| desc.sd_addr = (char *) &stats; |
| desc.sd_size = sizeof stats; |
| |
| if (inq_stats (1, &desc)) |
| return -1; |
| |
| c += stats.class_numcpus; |
| } |
| cpus = c; |
| samples = cpus < 2 ? 3 : (2 * cpus / 3); |
| } |
| |
| proc_info.sd_next = 0; |
| proc_info.sd_subsys = SUBSYS_PROC; |
| proc_info.sd_type = PROCTYPE_SUMMARY; |
| proc_info.sd_addr = (char *) &proc_sum_data; |
| proc_info.sd_size = sizeof (struct proc_summary); |
| proc_info.sd_sizeused = 0; |
| |
| if (inq_stats (1, &proc_info) != 0) |
| return -1; |
| |
| load = proc_sum_data.ps_nrunnable; |
| j = 0; |
| for (i = samples - 1; i > 0; --i) |
| { |
| load += proc_sum_data.ps_nrun[j]; |
| if (j++ == PS_NRUNSIZE) |
| j = 0; |
| } |
| |
| if (nelem > 0) |
| loadavg[elem++] = load / samples / cpus; |
| #endif /* UMAX */ |
| |
| #if !defined (LDAV_DONE) && defined (DGUX) |
| #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 *'. */ |
| dg_sys_info ((long int *) &load_info, |
| DG_SYS_INFO_LOAD_INFO_TYPE, |
| DG_SYS_INFO_LOAD_VERSION_0); |
| |
| if (nelem > 0) |
| loadavg[elem++] = load_info.one_minute; |
| if (nelem > 1) |
| loadavg[elem++] = load_info.five_minute; |
| if (nelem > 2) |
| loadavg[elem++] = load_info.fifteen_minute; |
| #endif /* DGUX */ |
| |
| #if !defined (LDAV_DONE) && defined (apollo) |
| #define LDAV_DONE |
| /* Apollo code from lisch@mentorg.com (Ray Lischner). |
| |
| This system call is not documented. The load average is obtained as |
| three long integers, for the load average over the past minute, |
| five minutes, and fifteen minutes. Each value is a scaled integer, |
| with 16 bits of integer part and 16 bits of fraction part. |
| |
| I'm not sure which operating system first supported this system call, |
| but I know that SR10.2 supports it. */ |
| |
| extern void proc1_$get_loadav (); |
| unsigned long load_ave[3]; |
| |
| proc1_$get_loadav (load_ave); |
| |
| if (nelem > 0) |
| loadavg[elem++] = load_ave[0] / 65536.0; |
| if (nelem > 1) |
| loadavg[elem++] = load_ave[1] / 65536.0; |
| if (nelem > 2) |
| loadavg[elem++] = load_ave[2] / 65536.0; |
| #endif /* apollo */ |
| |
| #if !defined (LDAV_DONE) && defined (OSF_MIPS) |
| #define LDAV_DONE |
| |
| struct tbl_loadavg load_ave; |
| table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); |
| loadavg[elem++] |
| = (load_ave.tl_lscale == 0 |
| ? load_ave.tl_avenrun.d[0] |
| : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale)); |
| #endif /* OSF_MIPS */ |
| |
| #if !defined (LDAV_DONE) && defined (OSF_ALPHA) |
| #define LDAV_DONE |
| |
| struct tbl_loadavg load_ave; |
| table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave)); |
| 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)); |
| #endif /* OSF_ALPHA */ |
| |
| #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; |
| #ifdef eunice |
| struct |
| { |
| int dsc$w_length; |
| char *dsc$a_pointer; |
| } descriptor; |
| #endif |
| |
| /* Ensure that there is a channel open to the load ave device. */ |
| if (!getloadavg_initialized) |
| { |
| /* Attempt to open the channel. */ |
| #ifdef eunice |
| descriptor.dsc$w_length = 18; |
| descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE"; |
| #else |
| $DESCRIPTOR (descriptor, "LAV0:"); |
| #endif |
| if (sys$assign (&descriptor, &channel, 0, 0) & 1) |
| getloadavg_initialized = 1; |
| } |
| |
| /* Read the load average vector. */ |
| if (getloadavg_initialized |
| && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0, |
| load_ave, 12, 0, 0, 0, 0) & 1)) |
| { |
| sys$dassgn (channel); |
| getloadavg_initialized = 0; |
| } |
| |
| if (!getloadavg_initialized) |
| return -1; |
| #endif /* VMS */ |
| |
| #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS) |
| |
| /* UNIX-specific code -- read the average from /dev/kmem. */ |
| |
| #define LDAV_PRIVILEGED /* This code requires special installation. */ |
| |
| LOAD_AVE_TYPE load_ave[3]; |
| |
| /* Get the address of LDAV_SYMBOL. */ |
| if (offset == 0) |
| { |
| #ifndef sgi |
| #ifndef NLIST_STRUCT |
| strcpy (nl[0].n_name, LDAV_SYMBOL); |
| strcpy (nl[1].n_name, ""); |
| #else /* NLIST_STRUCT */ |
| #ifdef NLIST_NAME_UNION |
| nl[0].n_un.n_name = LDAV_SYMBOL; |
| nl[1].n_un.n_name = 0; |
| #else /* not NLIST_NAME_UNION */ |
| nl[0].n_name = LDAV_SYMBOL; |
| nl[1].n_name = 0; |
| #endif /* not NLIST_NAME_UNION */ |
| #endif /* NLIST_STRUCT */ |
| |
| #ifndef SUNOS_5 |
| if (nlist (KERNEL_FILE, nl) >= 0) |
| /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */ |
| { |
| #ifdef FIXUP_KERNEL_SYMBOL_ADDR |
| FIXUP_KERNEL_SYMBOL_ADDR (nl); |
| #endif |
| offset = nl[0].n_value; |
| } |
| #endif /* !SUNOS_5 */ |
| #else /* sgi */ |
| int ldav_off; |
| |
| ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); |
| if (ldav_off != -1) |
| offset = (long) ldav_off & 0x7fffffff; |
| #endif /* sgi */ |
| } |
| |
| /* Make sure we have /dev/kmem open. */ |
| if (!getloadavg_initialized) |
| { |
| #ifndef SUNOS_5 |
| channel = open ("/dev/kmem", 0); |
| if (channel >= 0) |
| getloadavg_initialized = 1; |
| #else /* SUNOS_5 */ |
| /* We pass 0 for the kernel, corefile, and swapfile names |
| to use the currently running kernel. */ |
| kd = kvm_open (0, 0, 0, O_RDONLY, 0); |
| if (kd != 0) |
| { |
| /* nlist the currently running kernel. */ |
| kvm_nlist (kd, nl); |
| offset = nl[0].n_value; |
| getloadavg_initialized = 1; |
| } |
| #endif /* SUNOS_5 */ |
| } |
| |
| /* If we can, get the load average values. */ |
| if (offset && getloadavg_initialized) |
| { |
| /* Try to read the load. */ |
| #ifndef SUNOS_5 |
| if (lseek (channel, offset, 0) == -1L |
| || read (channel, (char *) load_ave, sizeof (load_ave)) |
| != sizeof (load_ave)) |
| { |
| close (channel); |
| getloadavg_initialized = 0; |
| } |
| #else /* SUNOS_5 */ |
| if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) |
| != sizeof (load_ave)) |
| { |
| kvm_close (kd); |
| getloadavg_initialized = 0; |
| } |
| #endif /* SUNOS_5 */ |
| } |
| |
| if (offset == 0 || !getloadavg_initialized) |
| return -1; |
| #endif /* LOAD_AVE_TYPE and not VMS */ |
| |
| #if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ |
| if (nelem > 0) |
| loadavg[elem++] = LDAV_CVT (load_ave[0]); |
| if (nelem > 1) |
| loadavg[elem++] = LDAV_CVT (load_ave[1]); |
| if (nelem > 2) |
| loadavg[elem++] = LDAV_CVT (load_ave[2]); |
| |
| #define LDAV_DONE |
| #endif /* !LDAV_DONE && LOAD_AVE_TYPE */ |
| |
| #ifdef LDAV_DONE |
| return elem; |
| #else |
| /* 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; |
| #endif |
| } |
| |
| #endif /* ! HAVE_GETLOADAVG */ |
| |
| #ifdef TEST |
| void |
| main (argc, argv) |
| 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"); |
| exit (1); |
| } |
| 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); |
| } |
| |
| exit (0); |
| } |
| #endif /* TEST */ |