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Diffstat (limited to 'getloadavg.c')
| -rw-r--r-- | getloadavg.c | 1028 |
1 files changed, 1028 insertions, 0 deletions
diff --git a/getloadavg.c b/getloadavg.c new file mode 100644 index 0000000..f9d7964 --- /dev/null +++ b/getloadavg.c @@ -0,0 +1,1028 @@ +/* Get the system load averages. +Copyright (C) 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, +1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, +2008, 2009, 2010 Free Software Foundation, Inc. + +GNU Make 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 3 of the License, or (at your option) any later +version. + +GNU Make 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, see <http://www.gnu.org/licenses/>. */ + +/* Compile-time symbols that this file uses: + + HAVE_PSTAT_GETDYNAMIC Define this if your system has the + pstat_getdynamic function. I think it + is unique to HPUX9. The best way to get the + definition is through the AC_FUNC_GETLOADAVG + 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. + 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; + or we have libkstat; + 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. + HAVE_STRUCT_NLIST_N_UN_N_NAME 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. + convex + DGUX + eunice UNIX emulator under VMS. + hpux + __MSDOS__ No-op for MSDOS. + 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 + WINDOWS32 No-op for Windows95/NT. + __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. */ +#if defined (unix) || defined (__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 + +#if HAVE_LOCALE_H +# include <locale.h> +#endif +#if !HAVE_SETLOCALE +# define setlocale(Category, Locale) /* empty */ +#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 + +/* 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. */ + + +/* Some shorthands. */ + +# if defined (HPUX) && !defined (hpux) +# define hpux +# endif + +# if defined (__hpux) && !defined (hpux) +# define hpux +# endif + +# if defined (__sun) && !defined (sun) +# define sun +# endif + +# if defined(hp300) && !defined(hpux) +# define MORE_BSD +# endif + +# if defined(ultrix) && defined(mips) +# define decstation +# endif + +# if defined (__SVR4) && !defined (SVR4) +# define SVR4 +# endif + +# if (defined(sun) && defined(SVR4)) || defined (SOLARIS2) +# define SUNOS_5 +# endif + +# if defined (__osf__) && (defined (__alpha) || defined (__alpha__)) +# define OSF_ALPHA +# include <sys/mbuf.h> +# include <sys/socket.h> +# include <net/route.h> +# 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 + +/* AC_FUNC_GETLOADAVG thinks QNX is SVR4, but it isn't. */ +# if defined(__QNX__) +# undef SVR4 +# 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 + +# ifdef _AIX +# define LOAD_AVE_TYPE long +# endif + +# ifdef convex +# define LOAD_AVE_TYPE double +# ifndef LDAV_CVT +# define LDAV_CVT(n) (n) +# endif +# 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 + +# ifdef _AIX +# define FSCALE 65536.0 +# endif + +# endif /* Not FSCALE. */ + +# if !defined (LDAV_CVT) && defined (FSCALE) +# define LDAV_CVT(n) (((double) (n)) / FSCALE) +# endif + + +# 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 (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)) || defined (_AIX)) +# 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)) && !defined(__riscos__) +# define LOAD_AVE_TYPE double +# endif + +# ifdef LOAD_AVE_TYPE + +# ifndef VMS +# ifndef __linux__ +# ifdef HAVE_NLIST_H +# include <nlist.h> +# else +# include <a.out.h> +# endif + +# ifdef SUNOS_5 +# include <fcntl.h> +# include <kvm.h> +# include <kstat.h> +# endif + +# if defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) +# include <sys/pstat.h> +# endif + +# ifndef KERNEL_FILE +# define KERNEL_FILE "/vmunix" +# endif /* KERNEL_FILE */ + +# ifndef LDAV_SYMBOL +# define LDAV_SYMBOL "_avenrun" +# endif /* LDAV_SYMBOL */ +# endif /* __linux__ */ + +# 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 */ + +# 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. */ +# define NeXT +# define host_self mach_host_self +# endif + +# 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 */ + +#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; +/* Offset in kmem to seek to read load average, or 0 means invalid. */ +static long offset; + +#if !defined(VMS) && !defined(sgi) && !defined(__linux__) +static struct nlist nl[2]; +#endif /* Not VMS or sgi */ + +#ifdef SUNOS_5 +static kvm_t *kd; +#endif /* SUNOS_5 */ + +#endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ + +/* 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 (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 (HAVE_LIBKSTAT) +/* Use libkstat because we don't have to be root. */ +# define LDAV_DONE + kstat_ctl_t *kc; + kstat_t *ksp; + kstat_named_t *kn; + + kc = kstat_open (); + if (kc == 0) + return -1; + ksp = kstat_lookup (kc, "unix", 0, "system_misc"); + if (ksp == 0 ) + return -1; + if (kstat_read (kc, ksp, 0) == -1) + return -1; + + + kn = kstat_data_lookup (ksp, "avenrun_1min"); + if (kn == 0) + { + /* Return -1 if no load average information is available. */ + nelem = 0; + elem = -1; + } + + if (nelem >= 1) + 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; + + if (nelem >= 3) + { + kn = kstat_data_lookup (ksp, "avenrun_15min"); + if (kn != 0) + loadavg[elem++] = (double) kn->value.ul/FSCALE; + } + } + } + + kstat_close (kc); +# endif /* HAVE_LIBKSTAT */ + +# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC) +/* Use pstat_getdynamic() because we don't have to be root. */ +# define LDAV_DONE +# undef LOAD_AVE_TYPE + + struct pst_dynamic dyn_info; + if (pstat_getdynamic (&dyn_info, sizeof (dyn_info), 0, 0) < 0) + return -1; + if (nelem > 0) + loadavg[elem++] = dyn_info.psd_avg_1_min; + if (nelem > 1) + loadavg[elem++] = dyn_info.psd_avg_5_min; + if (nelem > 2) + loadavg[elem++] = dyn_info.psd_avg_15_min; + +# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ + +# 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; + + /* 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]; + + 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; + memset (&stats, '\0', 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 (__MSDOS__) || defined (WINDOWS32)) +# define LDAV_DONE + + /* A faithful emulation is going to have to be saved for a rainy day. */ + for ( ; elem < nelem; elem++) + { + loadavg[elem] = 0.0; + } +# endif /* __MSDOS__ || WINDOWS32 */ + +# 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 HAVE_STRUCT_NLIST_N_UN_N_NAME + nl[0].n_un.n_name = LDAV_SYMBOL; + nl[1].n_un.n_name = 0; +# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ + nl[0].n_name = LDAV_SYMBOL; + nl[1].n_name = 0; +# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ +# endif /* NLIST_STRUCT */ + +# ifndef SUNOS_5 + if ( +# if !(defined (_AIX) && !defined (ps2)) + nlist (KERNEL_FILE, nl) +# else /* _AIX */ + knlist (nl, 1, sizeof (nl[0])) +# endif + >= 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) + { + /* Set the channel to close on exec, so it does not + litter any child's descriptor table. */ +# ifdef F_SETFD +# ifndef FD_CLOEXEC +# define FD_CLOEXEC 1 +# endif + (void) fcntl (channel, F_SETFD, FD_CLOEXEC); +# endif + 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 +#include "make.h" + +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"); + 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 */ |