diff options
Diffstat (limited to 'gl/getloadavg.c')
| -rw-r--r-- | gl/getloadavg.c | 234 |
1 files changed, 104 insertions, 130 deletions
diff --git a/gl/getloadavg.c b/gl/getloadavg.c index c6d782b4..6e228191 100644 --- a/gl/getloadavg.c +++ b/gl/getloadavg.c @@ -1,6 +1,6 @@ /* Get the system load averages. - Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2010 Free Software + Copyright (C) 1985-1989, 1991-1995, 1997, 1999-2000, 2003-2013 Free Software Foundation, Inc. NOTE: The canonical source of this file is maintained with gnulib. @@ -28,7 +28,7 @@ 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. + configure.ac 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. @@ -46,7 +46,7 @@ NLIST_STRUCT Include nlist.h, not a.out.h. N_NAME_POINTER 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'. + HAVE_STRUCT_NLIST_N_UN_N_NAME 'n_un.n_name' is member of 'struct nlist'. LINUX_LDAV_FILE [__linux__, __CYGWIN__]: File containing load averages. @@ -80,52 +80,23 @@ We also #define LDAV_PRIVILEGED if a program will require special installation to be able to call getloadavg. */ -/* "configure" defines CONFIGURING_GETLOADAVG to sidestep problems - with partially-configured source directories. */ - -#ifndef CONFIGURING_GETLOADAVG -# include <config.h> -# include <stdbool.h> -#endif +#include <config.h> /* Specification. */ #include <stdlib.h> #include <errno.h> +#include <stdbool.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 - configuration files' definitions for the LOAD_AVE_CVT macro (like - sparc.h's) use macros like FSCALE, defined here. */ -# if defined (unix) || defined (__unix) +# if HAVE_SYS_PARAM_H # include <sys/param.h> # endif -# include "c-strtod.h" -# include "cloexec.h" # include "intprops.h" -/* 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 @@ -372,7 +343,6 @@ # endif /* NLIST_STRUCT */ # ifdef SUNOS_5 -# include <fcntl.h> # include <kvm.h> # include <kstat.h> # endif @@ -461,7 +431,10 @@ # 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 /* Avoid static vars inside a function since in HPUX they dump as pure. */ @@ -482,13 +455,13 @@ static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */ # 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 @@ -500,7 +473,7 @@ static kvm_t *kd; /* 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) @@ -509,18 +482,17 @@ 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) @@ -559,10 +531,13 @@ getloadavg (double loadavg[], int nelem) } } + 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 @@ -579,7 +554,7 @@ getloadavg (double loadavg[], int nelem) # 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. */ @@ -596,6 +571,7 @@ getloadavg (double loadavg[], int nelem) # endif # if !defined (LDAV_DONE) && (defined (__linux__) || defined (__CYGWIN__)) + /* Linux without glibc, Cygwin */ # define LDAV_DONE # undef LOAD_AVE_TYPE @@ -605,39 +581,54 @@ getloadavg (double loadavg[], int nelem) 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; + + while (*ptr == ' ') + ptr++; - errno = 0; - d = c_strtod (ptr, &endptr); - if (ptr == endptr || (d == 0 && errno != 0)) + /* 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 @@ -657,7 +648,10 @@ getloadavg (double loadavg[], int nelem) &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; @@ -666,7 +660,7 @@ getloadavg (double loadavg[], int nelem) # 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. */ @@ -698,7 +692,10 @@ getloadavg (double loadavg[], int nelem) } if (!getloadavg_initialized) - return -1; + { + errno = ENOTSUP; + return -1; + } # endif /* NeXT */ # if !defined (LDAV_DONE) && defined (UMAX) @@ -732,7 +729,7 @@ getloadavg (double loadavg[], int nelem) 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; @@ -775,7 +772,7 @@ getloadavg (double loadavg[], int nelem) # 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 *'. */ + 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); @@ -825,6 +822,7 @@ getloadavg (double loadavg[], int nelem) # 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. */ @@ -834,7 +832,7 @@ getloadavg (double loadavg[], int nelem) } # 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; @@ -846,7 +844,7 @@ 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 */ /* VMS specific code -- read from the Load Ave driver. */ LOAD_AVE_TYPE load_ave[3]; @@ -883,10 +881,14 @@ getloadavg (double loadavg[], int nelem) } 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. */ @@ -899,38 +901,36 @@ getloadavg (double loadavg[], int nelem) { # 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 */ @@ -940,13 +940,27 @@ getloadavg (double loadavg[], int nelem) 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 @@ -955,8 +969,8 @@ getloadavg (double loadavg[], int nelem) 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 */ @@ -985,7 +999,10 @@ getloadavg (double loadavg[], int nelem) } 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. */ @@ -1000,51 +1017,8 @@ getloadavg (double loadavg[], int nelem) # 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 */ - -#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 */ |