X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgetloadavg.c;h=8b6067b8c6293ac03b8f31c1cd355a4551d4e626;hb=709c1f1fb17a388b106f6305a952da3ba802218e;hp=52958d4d53f145355d8feeadba3d2f5072f15b89;hpb=0615dbbda8a3e12cd738c69374edf6176e8fc594;p=gnulib.git diff --git a/lib/getloadavg.c b/lib/getloadavg.c index 52958d4d5..8b6067b8c 100644 --- a/lib/getloadavg.c +++ b/lib/getloadavg.c @@ -1,6 +1,10 @@ /* Get the system load averages. - Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995, 1997 - Free Software Foundation, Inc. + + Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994, + 1995, 1997, 1999, 2000, 2003, 2004 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 it under the terms of the GNU General Public License as published by @@ -35,11 +39,14 @@ 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. + HAVE_NLIST_H nlist.h is available. NLIST_STRUCT defaults + to this. 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. + HAVE_STRUCT_NLIST_N_UN_N_NAME `n_un.n_name' is member of `struct nlist'. LINUX_LDAV_FILE [__linux__]: File containing load averages. Specific system predefines this file uses, aside from setting @@ -61,9 +68,9 @@ 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. + __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. @@ -76,30 +83,28 @@ # include #endif -#include - -/* 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 -#endif - +#include +#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. */ +#ifndef HAVE_GETLOADAVG -#include +# include -#ifndef errno -extern int errno; -#endif - -#ifndef HAVE_GETLOADAVG +/* 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 +# include "c-strtod.h" +# include "cloexec.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 @@ -111,7 +116,7 @@ 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 @@ -131,6 +136,12 @@ extern int errno; # 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. */ @@ -149,11 +160,11 @@ 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 @@ -161,7 +172,7 @@ extern int errno; # define SVR4 # endif -# if (defined(sun) && defined(SVR4)) || defined (SOLARIS2) +# if (defined (sun) && defined (SVR4)) || defined (SOLARIS2) # define SUNOS_5 # endif @@ -233,7 +244,7 @@ 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 @@ -257,7 +268,7 @@ 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 @@ -273,7 +284,7 @@ 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 @@ -281,7 +292,7 @@ extern int errno; /* 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 +# define FSCALE 1000.0 # endif # if defined (ardent) && defined (titan) @@ -299,72 +310,16 @@ extern int errno; # endif /* Not FSCALE. */ # if !defined (LDAV_CVT) && defined (FSCALE) -# define LDAV_CVT(n) (((double) (n)) / 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 +# if HAVE_NLIST_H # define NLIST_STRUCT # endif +# 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 - -# ifdef _AIX -# define NLIST_STRUCT -# endif - -# endif /* defined (NLIST_STRUCT) */ - - -# 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 @@ -377,7 +332,7 @@ 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 @@ -386,7 +341,7 @@ 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)) # define LDAV_SYMBOL "avenrun" # endif @@ -394,11 +349,11 @@ extern int errno; # 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 @@ -447,7 +402,7 @@ extern int errno; # endif /* LOAD_AVE_TYPE */ -# if defined(__GNU__) && !defined (NeXT) +# 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. */ @@ -468,7 +423,6 @@ extern int errno; # endif /* sgi */ # ifdef UMAX -# include # include # include # include @@ -494,7 +448,7 @@ extern int errno; # include # endif -# if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION) +# if defined (HAVE_FCNTL_H) || defined (_POSIX_VERSION) # include # else # include @@ -504,7 +458,7 @@ extern int errno; # ifdef NeXT static processor_set_t default_set; -static int getloadavg_initialized; +static bool getloadavg_initialized; # endif /* NeXT */ # ifdef UMAX @@ -516,15 +470,15 @@ static unsigned int samples; static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ # endif /* DGUX */ -# ifdef 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 */ @@ -532,7 +486,7 @@ static struct nlist nl[2]; static kvm_t *kd; # endif /* SUNOS_5 */ -# endif /* LOAD_AVE_TYPE */ +# endif /* LOAD_AVE_TYPE && !HAVE_LIBKSTAT */ /* Put the 1 minute, 5 minute and 15 minute load averages into the first NELEM elements of LOADAVG. @@ -540,9 +494,7 @@ 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. */ @@ -565,7 +517,7 @@ 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; @@ -580,20 +532,20 @@ 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; } } } @@ -626,25 +578,37 @@ getloadavg (loadavg, nelem) # define LINUX_LDAV_FILE "/proc/loadavg" # endif - char ldavgbuf[40]; - double load_ave[3]; +/* Upper bound on the string length of an integer converted to string. + 302 / 1000 is ceil (log10 (2.0)). Subtract 1 for the sign bit; + add 1 for integer division truncation; add 1 more for a minus sign. */ +# define INT_STRLEN_BOUND(t) ((sizeof (t) * CHAR_BIT - 1) * 302 / 1000 + 2) + + char ldavgbuf[3 * (INT_STRLEN_BOUND (long 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'; - 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]; + 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; @@ -685,7 +649,7 @@ 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. */ @@ -693,7 +657,7 @@ 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) @@ -702,7 +666,7 @@ 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) @@ -855,15 +819,15 @@ 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) /* 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 { @@ -883,7 +847,7 @@ 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. */ @@ -892,14 +856,14 @@ 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 */ -# 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. */ @@ -915,13 +879,13 @@ getloadavg (loadavg, nelem) strcpy (nl[0].n_name, LDAV_SYMBOL); strcpy (nl[1].n_name, ""); # else /* NLIST_STRUCT */ -# ifdef NLIST_NAME_UNION +# 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 NLIST_NAME_UNION */ +# else /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ nl[0].n_name = LDAV_SYMBOL; nl[1].n_name = 0; -# endif /* not NLIST_NAME_UNION */ +# endif /* not HAVE_STRUCT_NLIST_N_UN_N_NAME */ # endif /* NLIST_STRUCT */ # ifndef SUNOS_5 @@ -945,7 +909,7 @@ 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 */ } @@ -958,13 +922,8 @@ getloadavg (loadavg, nelem) { /* Set the channel to close on exec, so it does not litter any child's descriptor table. */ -# ifdef FD_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 @@ -975,7 +934,7 @@ 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 */ } @@ -990,14 +949,14 @@ 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 */ } @@ -1030,10 +989,8 @@ getloadavg (loadavg, nelem) #endif /* ! HAVE_GETLOADAVG */ #ifdef TEST -void -main (argc, argv) - int argc; - char **argv; +int +main (int argc, char **argv) { int naptime = 0; @@ -1050,7 +1007,7 @@ 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]); @@ -1066,6 +1023,6 @@ main (argc, argv) sleep (naptime); } - exit (0); + return EXIT_SUCCESS; } #endif /* TEST */