X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgetloadavg.c;h=cfa62735bb1244402d8c71ced1589f5ce6ee780d;hb=0a459e96114987ee4ffe3f1a8c600e6ff35a65c1;hp=eb533f16cea68e27a12531c7a6556171b6efe145;hpb=1663c6539ce322a8d12793f7915d0eb3ec32e491;p=gnulib.git diff --git a/lib/getloadavg.c b/lib/getloadavg.c index eb533f16c..cfa62735b 100644 --- a/lib/getloadavg.c +++ b/lib/getloadavg.c @@ -1,7 +1,8 @@ /* Get the system load averages. Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994, - 1995, 1997, 1999, 2000, 2003 Free Software Foundation, Inc. + 1995, 1997, 1999, 2000, 2003, 2004, 2005, 2006 Free Software + Foundation, Inc. NOTE: The canonical source of this file is maintained with gnulib. Bugs can be reported to bug-gnulib@gnu.org. @@ -18,7 +19,7 @@ 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, + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* Compile-time symbols that this file uses: @@ -32,7 +33,7 @@ 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. + 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. @@ -47,9 +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: @@ -70,9 +70,10 @@ UMAX4_3 VMS WINDOWS32 No-op for Windows95/NT. - __linux__ Linux: assumes /proc filesystem mounted. + __linux__ Linux: assumes /proc file system mounted. Support from Michael K. Johnson. - __NetBSD__ NetBSD: assumes /kern filesystem mounted. + __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. @@ -80,41 +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 @@ -286,7 +282,7 @@ extern int errno; # endif -# ifndef FSCALE +# ifndef FSCALE /* SunOS and some others define FSCALE in sys/param.h. */ @@ -355,11 +351,7 @@ extern int errno; # 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. */ @@ -369,7 +361,7 @@ extern int errno; # ifdef LOAD_AVE_TYPE -# ifndef VMS +# ifndef __VMS # ifndef __linux__ # ifndef NLIST_STRUCT # include @@ -396,7 +388,7 @@ extern int errno; # endif /* LDAV_SYMBOL */ # endif /* __linux__ */ -# else /* VMS */ +# else /* __VMS */ # ifndef eunice # include @@ -404,7 +396,7 @@ extern int errno; # else /* eunice */ # include # endif /* eunice */ -# endif /* VMS */ +# endif /* __VMS */ # ifndef LDAV_CVT # define LDAV_CVT(n) ((double) (n)) @@ -433,7 +425,6 @@ extern int errno; # endif /* sgi */ # ifdef UMAX -# include # include # include # include @@ -459,17 +450,13 @@ 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 @@ -481,23 +468,23 @@ 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. @@ -581,7 +568,7 @@ getloadavg (double loadavg[], int nelem) # endif /* hpux && HAVE_PSTAT_GETDYNAMIC */ -# if !defined (LDAV_DONE) && defined (__linux__) +# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) # define LDAV_DONE # undef LOAD_AVE_TYPE @@ -589,32 +576,36 @@ getloadavg (double loadavg[], int 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 @@ -651,7 +642,7 @@ getloadavg (double loadavg[], int 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. */ @@ -659,7 +650,7 @@ getloadavg (double loadavg[], int nelem) if (!getloadavg_initialized) { if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS) - getloadavg_initialized = 1; + getloadavg_initialized = true; } if (getloadavg_initialized) @@ -668,7 +659,7 @@ getloadavg (double loadavg[], int 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) @@ -825,11 +816,11 @@ getloadavg (double loadavg[], int nelem) : (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 { @@ -849,7 +840,7 @@ getloadavg (double loadavg[], int nelem) $DESCRIPTOR (descriptor, "LAV0:"); # endif if (sys$assign (&descriptor, &channel, 0, 0) & 1) - getloadavg_initialized = 1; + getloadavg_initialized = true; } /* Read the load average vector. */ @@ -858,14 +849,14 @@ getloadavg (double loadavg[], int 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. */ @@ -911,7 +902,7 @@ getloadavg (double loadavg[], int 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 */ } @@ -919,18 +910,13 @@ getloadavg (double loadavg[], int 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 @@ -941,7 +927,7 @@ getloadavg (double loadavg[], int nelem) /* nlist the currently running kernel. */ kvm_nlist (kd, nl); offset = nl[0].n_value; - getloadavg_initialized = 1; + getloadavg_initialized = true; } # endif /* SUNOS_5 */ } @@ -956,21 +942,21 @@ getloadavg (double loadavg[], int 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; + 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) @@ -983,20 +969,19 @@ getloadavg (double loadavg[], int 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 +int main (int argc, char **argv) { int naptime = 0; @@ -1014,7 +999,7 @@ main (int argc, char **argv) if (loads == -1) { perror ("Error getting load average"); - exit (1); + return EXIT_FAILURE; } if (loads > 0) printf ("1-minute: %f ", avg[0]); @@ -1030,6 +1015,6 @@ main (int argc, char **argv) sleep (naptime); } - exit (0); + return EXIT_SUCCESS; } #endif /* TEST */