X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgetloadavg.c;h=5faa8faa322c0c4b01a1862d1870badcc824dbe5;hb=f1fcb8539c9d1c7d9cefb25ce5c07a099ea1f148;hp=462ee16fa54818d8096d6a15c398b223284b5b1e;hpb=d22288547cbbc8b83147ef51b98144a3c7090693;p=gnulib.git diff --git a/lib/getloadavg.c b/lib/getloadavg.c index 462ee16fa..5faa8faa3 100644 --- a/lib/getloadavg.c +++ b/lib/getloadavg.c @@ -1,14 +1,16 @@ /* Get the system load averages. - Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995, 1997, 2003 - Free Software Foundation, Inc. + + Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994, + 1995, 1997, 1999, 2000, 2003, 2004, 2005, 2006, 2007 Free Software + Foundation, Inc. NOTE: The canonical source of this file is maintained with gnulib. Bugs can be reported to bug-gnulib@gnu.org. - This program is free software; you can redistribute it and/or modify + 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. + the Free Software Foundation; either version 3 of the License, 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 @@ -16,9 +18,7 @@ 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, - USA. */ + along with this program. If not, see . */ /* Compile-time symbols that this file uses: @@ -30,8 +30,10 @@ If that isn't an option, then just put AC_CHECK_FUNCS(pstat_getdynamic) in your configure.in 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. - KERNEL_FILE Pathname of the kernel to nlist. + KERNEL_FILE Name of the kernel file to nlist. LDAV_CVT() Scale the load average from the kernel. Returns a double. LDAV_SYMBOL Name of kernel symbol giving load average. @@ -46,9 +48,8 @@ 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'. - LINUX_LDAV_FILE [__linux__]: File containing load averages. - HAVE_LOCALE_H locale.h is available. - HAVE_SETLOCALE The `setlocale' function is available. + LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing + load averages. Specific system predefines this file uses, aside from setting default values if not emacs: @@ -69,9 +70,10 @@ 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. + __linux__ Linux: assumes /proc file system mounted. + Support from Michael K. Johnson. + __CYGWIN__ Cygwin emulates linux /proc/loadavg. + __NetBSD__ NetBSD: assumes /kern file system mounted. In addition, to avoid nesting many #ifdefs, we internally set LDAV_DONE to indicate that the load average has been computed. @@ -79,41 +81,36 @@ 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 -#endif - -#include +/* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems + with partially-configured source directories. */ -/* 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 +#ifndef CONFIGURING_GETLOADAVG +# include +# include #endif +#include +#include +#include /* Exclude all the code except the test program at the end - if the system has its own `getloadavg' function. + 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 +#ifndef HAVE_GETLOADAVG -#ifndef errno -extern int errno; -#endif +# include -#ifdef HAVE_LOCALE_H -# include -#endif -#ifndef HAVE_SETLOCALE -# define setlocale(Category, Locale) /* empty */ -#endif +/* 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 +# endif -#ifndef HAVE_GETLOADAVG +# include "c-strtod.h" +# include "cloexec.h" +# include "intprops.h" +# include "xalloc.h" /* The existing Emacs configuration files define a macro called LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and @@ -125,7 +122,7 @@ extern int errno; LOAD_AVE_CVT, but future machine config files should just define LDAV_CVT directly. */ -# if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT) +# if !defined (LDAV_CVT) && defined (LOAD_AVE_CVT) # define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0) # endif @@ -169,11 +166,11 @@ extern int errno; # define sun # endif -# if defined(hp300) && !defined(hpux) +# if defined (hp300) && !defined (hpux) # define MORE_BSD # endif -# if defined(ultrix) && defined(mips) +# if defined (ultrix) && defined (mips) # define decstation # endif @@ -181,7 +178,7 @@ extern int errno; # define SVR4 # endif -# if (defined(sun) && defined(SVR4)) || defined (SOLARIS2) +# if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) # define SUNOS_5 # endif @@ -191,6 +188,8 @@ extern int errno; # include # include # include +/* Tru64 4.0D's table.h redefines sys */ +# undef sys # endif # if defined (__osf__) && (defined (mips) || defined (__mips__)) @@ -253,11 +252,11 @@ extern int errno; # define LOAD_AVE_TYPE long # endif -# if defined(alliant) && defined(i860) /* Alliant FX/2800 */ +# if defined (alliant) && defined (i860) /* Alliant FX/2800 */ # define LOAD_AVE_TYPE long # endif -# ifdef _AIX +# if defined _AIX && ! defined HAVE_LIBPERFSTAT # define LOAD_AVE_TYPE long # endif @@ -277,7 +276,7 @@ extern int errno; # define FSCALE 1024.0 # endif -# if defined(alliant) && defined(i860) /* Alliant FX/2800 */ +# if defined (alliant) && defined (i860) /* Alliant FX/2800 */ /* defines an incorrect value for FSCALE on an Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */ # undef FSCALE @@ -285,7 +284,7 @@ extern int errno; # endif -# ifndef FSCALE +# ifndef FSCALE /* SunOS and some others define FSCALE in sys/param.h. */ @@ -293,7 +292,7 @@ extern int errno; # define FSCALE 2048.0 # endif -# if defined(MIPS) || defined(SVR4) || defined(decstation) +# if defined (MIPS) || defined (SVR4) || defined (decstation) # define FSCALE 256 # endif @@ -312,7 +311,7 @@ extern int errno; # define FSCALE 100.0 # endif -# ifdef _AIX +# if defined _AIX && !defined HAVE_LIBPERFSTAT # define FSCALE 65536.0 # endif @@ -328,7 +327,7 @@ extern int errno; # endif # endif -# if defined(sgi) || (defined(mips) && !defined(BSD)) +# if defined (sgi) || (defined (mips) && !defined (BSD)) # define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31)) # endif @@ -341,7 +340,7 @@ extern int errno; # define KERNEL_FILE "/hp-ux" # endif -# if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || (defined (ardent) && defined (titan))) +# if !defined (KERNEL_FILE) && (defined (_SEQUENT_) || defined (MIPS) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan))) # define KERNEL_FILE "/unix" # endif @@ -350,25 +349,21 @@ extern int errno; # 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)) +# if !defined (LDAV_SYMBOL) && ((defined (hpux) && !defined (hp9000s300)) || defined (_SEQUENT_) || defined (SVR4) || defined (ISC) || defined (sgi) || (defined (ardent) && defined (titan)) || (defined (_AIX) && !defined(HAVE_LIBPERFSTAT))) # define LDAV_SYMBOL "avenrun" # endif -# ifdef HAVE_UNISTD_H -# include -# endif - -# include +# include /* 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)) +# 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 __VMS # ifndef __linux__ # ifndef NLIST_STRUCT # include @@ -395,7 +390,7 @@ extern int errno; # endif /* LDAV_SYMBOL */ # endif /* __linux__ */ -# else /* VMS */ +# else /* __VMS */ # ifndef eunice # include @@ -403,7 +398,7 @@ extern int errno; # else /* eunice */ # include # endif /* eunice */ -# endif /* VMS */ +# endif /* __VMS */ # ifndef LDAV_CVT # define LDAV_CVT(n) ((double) (n)) @@ -411,7 +406,15 @@ extern int errno; # endif /* LOAD_AVE_TYPE */ -# if defined(__GNU__) && !defined (NeXT) +# if defined HAVE_LIBPERFSTAT +# include +# include +# ifndef SBITS +# define SBITS 16 +# endif +# endif + +# 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. */ @@ -432,7 +435,6 @@ extern int errno; # endif /* sgi */ # ifdef UMAX -# include # include # include # include @@ -458,17 +460,13 @@ extern int errno; # include # endif -# if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION) -# include -# else -# include -# endif +# include "fcntl--.h" /* 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; +static bool getloadavg_initialized; # endif /* NeXT */ # ifdef UMAX @@ -480,23 +478,23 @@ static unsigned int samples; static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ # endif /* DGUX */ -#if !defined(HAVE_LIBKSTAT) && defined(LOAD_AVE_TYPE) +# 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; +/* True iff channel is valid. */ +static bool 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__) +# if ! defined __VMS && ! defined sgi && ! defined __linux__ static struct nlist nl[2]; -# endif /* Not VMS or sgi */ +# endif # ifdef SUNOS_5 static kvm_t *kd; # endif /* SUNOS_5 */ -#endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ +# endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ /* Put the 1 minute, 5 minute and 15 minute load averages into the first NELEM elements of LOADAVG. @@ -504,9 +502,7 @@ static kvm_t *kd; or -1 if an error occurred. */ int -getloadavg (loadavg, nelem) - double loadavg[]; - int nelem; +getloadavg (double loadavg[], int nelem) { int elem = 0; /* Return value. */ @@ -529,7 +525,7 @@ getloadavg (loadavg, nelem) if (kc == 0) return -1; ksp = kstat_lookup (kc, "unix", 0, "system_misc"); - if (ksp == 0 ) + if (ksp == 0) return -1; if (kstat_read (kc, ksp, 0) == -1) return -1; @@ -544,20 +540,20 @@ getloadavg (loadavg, nelem) } if (nelem >= 1) - loadavg[elem++] = (double) kn->value.ul/FSCALE; + 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; + 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; + loadavg[elem++] = (double) kn->value.ul / FSCALE; } } } @@ -582,7 +578,23 @@ getloadavg (loadavg, nelem) # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ -# if !defined (LDAV_DONE) && defined (__linux__) +# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT +# define LDAV_DONE +# undef LOAD_AVE_TYPE +/* Use perfstat_cpu_total because we don't have to be root. */ + { + perfstat_cpu_total_t cpu_stats; + int result = perfstat_cpu_total (NULL, &cpu_stats, sizeof cpu_stats, 1); + if (result == -1) + return result; + loadavg[0] = cpu_stats.loadavg[0] / (double)(1 << SBITS); + loadavg[1] = cpu_stats.loadavg[1] / (double)(1 << SBITS); + loadavg[2] = cpu_stats.loadavg[2] / (double)(1 << SBITS); + elem = 3; + } +# endif + +# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) # define LDAV_DONE # undef LOAD_AVE_TYPE @@ -590,32 +602,36 @@ getloadavg (loadavg, nelem) # define LINUX_LDAV_FILE "/proc/loadavg" # endif - char ldavgbuf[40]; - double load_ave[3]; + char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")]; + char const *ptr = ldavgbuf; int fd, count; fd = open (LINUX_LDAV_FILE, O_RDONLY); if (fd == -1) return -1; - count = read (fd, ldavgbuf, 40); + count = read (fd, ldavgbuf, sizeof ldavgbuf - 1); (void) close (fd); if (count <= 0) return -1; + ldavgbuf[count] = '\0'; - /* 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]; + for (elem = 0; elem < nelem; elem++) + { + char *endptr; + double d = c_strtod (ptr, &endptr); + if (ptr == endptr) + { + if (elem == 0) + return -1; + break; + } + loadavg[elem] = d; + ptr = endptr; + } return elem; -# endif /* __linux__ */ +# endif /* __linux__ || __CYGWIN__ */ # if !defined (LDAV_DONE) && defined (__NetBSD__) # define LDAV_DONE @@ -652,7 +668,7 @@ getloadavg (loadavg, nelem) host_t host; struct processor_set_basic_info info; - unsigned info_count; + unsigned int 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. */ @@ -660,7 +676,7 @@ getloadavg (loadavg, nelem) if (!getloadavg_initialized) { if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) - getloadavg_initialized = 1; + getloadavg_initialized = true; } if (getloadavg_initialized) @@ -669,7 +685,7 @@ getloadavg (loadavg, nelem) if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host, (processor_set_info_t) &info, &info_count) != KERN_SUCCESS) - getloadavg_initialized = 0; + getloadavg_initialized = false; else { if (nelem > 0) @@ -822,15 +838,15 @@ getloadavg (loadavg, nelem) 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)); + ? 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) +# 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; + static bool getloadavg_initialized; # ifdef eunice struct { @@ -850,7 +866,7 @@ getloadavg (loadavg, nelem) $DESCRIPTOR (descriptor, "LAV0:"); # endif if (sys$assign (&descriptor, &channel, 0, 0) & 1) - getloadavg_initialized = 1; + getloadavg_initialized = true; } /* Read the load average vector. */ @@ -859,14 +875,14 @@ getloadavg (loadavg, nelem) load_ave, 12, 0, 0, 0, 0) & 1)) { sys$dassgn (channel); - getloadavg_initialized = 0; + getloadavg_initialized = false; } if (!getloadavg_initialized) return -1; -# endif /* VMS */ +# endif /* ! defined LDAV_DONE && defined __VMS */ -# if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS) +# if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS /* UNIX-specific code -- read the average from /dev/kmem. */ @@ -912,7 +928,7 @@ getloadavg (loadavg, nelem) ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN); if (ldav_off != -1) - offset = (long) ldav_off & 0x7fffffff; + offset = (long int) ldav_off & 0x7fffffff; # endif /* sgi */ } @@ -920,18 +936,13 @@ getloadavg (loadavg, nelem) if (!getloadavg_initialized) { # ifndef SUNOS_5 - channel = open ("/dev/kmem", 0); + channel = open ("/dev/kmem", O_RDONLY); 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; + set_cloexec_flag (channel, true); + getloadavg_initialized = true; } # else /* SUNOS_5 */ /* We pass 0 for the kernel, corefile, and swapfile names @@ -942,7 +953,7 @@ getloadavg (loadavg, nelem) /* nlist the currently running kernel. */ kvm_nlist (kd, nl); offset = nl[0].n_value; - getloadavg_initialized = 1; + getloadavg_initialized = true; } # endif /* SUNOS_5 */ } @@ -957,21 +968,21 @@ getloadavg (loadavg, nelem) != sizeof (load_ave)) { close (channel); - getloadavg_initialized = 0; + getloadavg_initialized = false; } # else /* SUNOS_5 */ if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave)) != sizeof (load_ave)) - { - kvm_close (kd); - getloadavg_initialized = 0; + { + kvm_close (kd); + getloadavg_initialized = false; } # endif /* SUNOS_5 */ } if (offset == 0 || !getloadavg_initialized) return -1; -# endif /* LOAD_AVE_TYPE and not VMS */ +# endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */ # if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */ if (nelem > 0) @@ -984,23 +995,20 @@ getloadavg (loadavg, nelem) # define LDAV_DONE # endif /* !LDAV_DONE && LOAD_AVE_TYPE */ -# ifdef LDAV_DONE - return elem; -# else +# 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; - return -1; + elem = -1; # endif + return elem; } #endif /* ! HAVE_GETLOADAVG */ #ifdef TEST -void -main (argc, argv) - int argc; - char **argv; +int +main (int argc, char **argv) { int naptime = 0; @@ -1017,7 +1025,7 @@ main (argc, argv) if (loads == -1) { perror ("Error getting load average"); - exit (1); + return EXIT_FAILURE; } if (loads > 0) printf ("1-minute: %f ", avg[0]); @@ -1033,6 +1041,6 @@ main (argc, argv) sleep (naptime); } - exit (0); + return EXIT_SUCCESS; } #endif /* TEST */