/* Get the system load averages.
- Copyright (C) 1985, 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994,
- 1995, 1997, 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free
- Software Foundation, Inc.
+ Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2011 Free Software
+ Foundation, Inc.
NOTE: The canonical source of this file is maintained with gnulib.
Bugs can be reported to bug-gnulib@gnu.org.
#include <errno.h>
#include <stdio.h>
-/* Exclude all the code except the test program at the end
- if the system has its own `getloadavg' function. */
-
-#ifndef HAVE_GETLOADAVG
-
# include <sys/types.h>
/* Both the Emacs and non-Emacs sections want this. Some
# include <sys/param.h>
# endif
-# 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
# endif /* NLIST_STRUCT */
# ifdef SUNOS_5
-# include <fcntl.h>
# include <kvm.h>
# include <kstat.h>
# endif
# include <sys/dg_sys_info.h>
# endif
-# include "fcntl--.h"
+# if (defined __linux__ || defined __CYGWIN__ || defined SUNOS_5 \
+ || (defined LOAD_AVE_TYPE && ! defined __VMS))
+# include <fcntl.h>
+# endif
\f
/* Avoid static vars inside a function since in HPUX they dump as pure. */
# if !defined (HAVE_LIBKSTAT) && defined (LOAD_AVE_TYPE)
/* File descriptor open to /dev/kmem or VMS load ave driver. */
static int channel;
-/* True iff channel is valid. */
+/* True if 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__
-static struct nlist nl[2];
+static struct nlist name_list[2];
# endif
# ifdef SUNOS_5
/* 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. */
+ or -1 (setting errno) if an error occurred. */
int
getloadavg (double loadavg[], int nelem)
# 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;
+ errno = ENOSYS;
elem = -1;
# endif
-# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT)
+# if !defined (LDAV_DONE) && defined (HAVE_LIBKSTAT) /* Solaris <= 2.6 */
/* Use libkstat because we don't have to be root. */
# define LDAV_DONE
kstat_ctl_t *kc;
kstat_t *ksp;
kstat_named_t *kn;
+ int saved_errno;
kc = kstat_open ();
if (kc == 0)
}
}
+ saved_errno = errno;
kstat_close (kc);
+ errno = saved_errno;
# endif /* HAVE_LIBKSTAT */
# if !defined (LDAV_DONE) && defined (hpux) && defined (HAVE_PSTAT_GETDYNAMIC)
+ /* HP-UX */
/* Use pstat_getdynamic() because we don't have to be root. */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
# endif /* hpux && HAVE_PSTAT_GETDYNAMIC */
-# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT
+# if ! defined LDAV_DONE && defined HAVE_LIBPERFSTAT /* AIX */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
/* Use perfstat_cpu_total because we don't have to be root. */
# endif
# if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__))
+ /* Linux without glibc, Cygwin */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
char ldavgbuf[3 * (INT_STRLEN_BOUND (int) + sizeof ".00 ")];
char const *ptr = ldavgbuf;
- int fd, count;
+ int fd, count, saved_errno;
fd = open (LINUX_LDAV_FILE, O_RDONLY);
if (fd == -1)
return -1;
count = read (fd, ldavgbuf, sizeof ldavgbuf - 1);
+ saved_errno = errno;
(void) close (fd);
+ errno = saved_errno;
if (count <= 0)
return -1;
ldavgbuf[count] = '\0';
for (elem = 0; elem < nelem; elem++)
{
- char *endptr;
- double d;
+ double numerator = 0;
+ double denominator = 1;
- errno = 0;
- d = c_strtod (ptr, &endptr);
- if (ptr == endptr || (d == 0 && errno != 0))
+ while (*ptr == ' ')
+ ptr++;
+
+ /* Finish if this number is missing, and report an error if all
+ were missing. */
+ if (! ('0' <= *ptr && *ptr <= '9'))
{
if (elem == 0)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
break;
}
- loadavg[elem] = d;
- ptr = endptr;
+
+ while ('0' <= *ptr && *ptr <= '9')
+ numerator = 10 * numerator + (*ptr++ - '0');
+
+ if (*ptr == '.')
+ for (ptr++; '0' <= *ptr && *ptr <= '9'; ptr++)
+ numerator = 10 * numerator + (*ptr - '0'), denominator *= 10;
+
+ loadavg[elem++] = numerator / denominator;
}
return elem;
# endif /* __linux__ || __CYGWIN__ */
-# if !defined (LDAV_DONE) && defined (__NetBSD__)
+# if !defined (LDAV_DONE) && defined (__NetBSD__) /* NetBSD < 0.9 */
# define LDAV_DONE
# undef LOAD_AVE_TYPE
&scale);
(void) fclose (fp);
if (count != 4)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
for (elem = 0; elem < nelem; elem++)
loadavg[elem] = (double) load_ave[elem] / (double) scale;
# endif /* __NetBSD__ */
-# if !defined (LDAV_DONE) && defined (NeXT)
+# if !defined (LDAV_DONE) && defined (NeXT) /* NeXTStep */
# define LDAV_DONE
/* The NeXT code was adapted from iscreen 3.2. */
}
if (!getloadavg_initialized)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
# endif /* NeXT */
# if !defined (LDAV_DONE) && defined (UMAX)
for (i = 0; i < conf.config_maxclass; ++i)
{
struct class_stats stats;
- bzero ((char *) &stats, sizeof stats);
+ memset (&stats, 0, sizeof stats);
desc.sd_type = CPUTYPE_CLASS;
desc.sd_objid = i;
# endif /* OSF_MIPS */
# if !defined (LDAV_DONE) && (defined (__MSDOS__) || defined (WINDOWS32))
+ /* DJGPP */
# define LDAV_DONE
/* A faithful emulation is going to have to be saved for a rainy day. */
}
# endif /* __MSDOS__ || WINDOWS32 */
-# if !defined (LDAV_DONE) && defined (OSF_ALPHA)
+# if !defined (LDAV_DONE) && defined (OSF_ALPHA) /* OSF/1 */
# define LDAV_DONE
struct tbl_loadavg load_ave;
: (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 */
/* VMS specific code -- read from the Load Ave driver. */
LOAD_AVE_TYPE load_ave[3];
}
if (!getloadavg_initialized)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
# endif /* ! defined LDAV_DONE && defined __VMS */
# if ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS
+ /* IRIX, other old systems */
/* UNIX-specific code -- read the average from /dev/kmem. */
{
# ifndef sgi
# if ! defined NLIST_STRUCT || ! defined N_NAME_POINTER
- strcpy (nl[0].n_name, LDAV_SYMBOL);
- strcpy (nl[1].n_name, "");
+ strcpy (name_list[0].n_name, LDAV_SYMBOL);
+ strcpy (name_list[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;
+ name_list[0].n_un.n_name = LDAV_SYMBOL;
+ name_list[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;
+ name_list[0].n_name = LDAV_SYMBOL;
+ name_list[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)
+ nlist (KERNEL_FILE, name_list)
# else /* _AIX */
- knlist (nl, 1, sizeof (nl[0]))
+ knlist (name_list, 1, sizeof (name_list[0]))
# endif
>= 0)
- /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
+ /* Omit "&& name_list[0].n_type != 0 " -- it breaks on Sun386i. */
{
# ifdef FIXUP_KERNEL_SYMBOL_ADDR
- FIXUP_KERNEL_SYMBOL_ADDR (nl);
+ FIXUP_KERNEL_SYMBOL_ADDR (name_list);
# endif
- offset = nl[0].n_value;
+ offset = name_list[0].n_value;
}
# endif /* !SUNOS_5 */
# else /* sgi */
- int ldav_off;
-
- ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
+ ptrdiff_t ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
if (ldav_off != -1)
offset = (long int) ldav_off & 0x7fffffff;
# endif /* sgi */
if (!getloadavg_initialized)
{
# ifndef SUNOS_5
- 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. */
+# ifndef O_CLOEXEC
+# define O_CLOEXEC 0
+# endif
+ int fd = open ("/dev/kmem", O_RDONLY | O_CLOEXEC);
+ if (0 <= fd)
{
- /* Set the channel to close on exec, so it does not
- litter any child's descriptor table. */
- set_cloexec_flag (channel, true);
- getloadavg_initialized = true;
+# if F_DUPFD_CLOEXEC
+ if (fd <= STDERR_FILENO)
+ {
+ int fd1 = fcntl (fd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1);
+ close (fd);
+ fd = fd1;
+ }
+# endif
+ if (0 <= fd)
+ {
+ channel = fd;
+ getloadavg_initialized = true;
+ }
}
# else /* SUNOS_5 */
/* We pass 0 for the kernel, corefile, and swapfile names
if (kd != 0)
{
/* nlist the currently running kernel. */
- kvm_nlist (kd, nl);
- offset = nl[0].n_value;
+ kvm_nlist (kd, name_list);
+ offset = name_list[0].n_value;
getloadavg_initialized = true;
}
# endif /* SUNOS_5 */
}
if (offset == 0 || !getloadavg_initialized)
- return -1;
+ {
+ errno = ENOTSUP;
+ return -1;
+ }
# endif /* ! defined LDAV_DONE && defined LOAD_AVE_TYPE && ! defined __VMS */
# if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
# endif /* !LDAV_DONE && LOAD_AVE_TYPE */
# 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;
+ errno = ENOSYS;
elem = -1;
# endif
return elem;
}
-
-#endif /* ! HAVE_GETLOADAVG */
-\f
-#ifdef TEST
-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");
- return EXIT_FAILURE;
- }
- 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);
- }
-
- return EXIT_SUCCESS;
-}
-#endif /* TEST */