diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/getsysstats.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/getsysstats.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c new file mode 100644 index 0000000000..81946b422f --- /dev/null +++ b/sysdeps/unix/sysv/linux/getsysstats.c @@ -0,0 +1,200 @@ +/* getsysstats - Determine various system internal values, Linux version. +Copyright (C) 1996 Free Software Foundation, Inc. +This file is part of the GNU C Library. +Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <mntent.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <sys/sysinfo.h> + + +/* Determine the path to the /proc filesystem if available. */ +static char * +get_proc_path (char *buffer, size_t bufsize) +{ + FILE *fp; + struct mntent mount_point; + struct mntent *entry; + char *result; + + /* First find the mount point of the proc filesystem. */ + fp = __setmntent (_PATH_MNTTAB, "r"); + if (fp == NULL) + /* Cannot find mount table file. */ + result = NULL; + else + { + while ((entry = __getmntent_r (fp, &mount_point, buffer, bufsize)) + != NULL) + if (strcmp (mount_point.mnt_type, "proc") == 0) + { + result = mount_point.mnt_dir; + break; + } + __endmntent (fp); + } + + return result; +} + + +/* How we can determine the number of available processors depends on + the configuration. There is currently (as of version 2.0.21) no + system call to determine the number. It is planned for the 2.1.x + series to add this, though. + + One possibility to implement it for systems using Linux 2.0 is to + examine the pseudo file /proc/meminfo. Here we have one entry for + each processor. + + But not all systems have support for the /proc filesystem. If it + is not available we simply return 1 since there is no way. */ +int +__get_nprocs () +{ + FILE *fp; + char buffer[8192]; + char *proc_path; + int result = 1; + + /* XXX Here will come a test for the new system call. */ + + /* Get mount point of proc filesystem. */ + proc_path = get_proc_path (buffer, sizeof buffer); + + /* If we haven't found an appropriate entry return 1. */ + if (proc_path != NULL) + { + char *proc_cpuinfo = alloca (strlen (proc_path) + sizeof ("/cpuinfo")); + __stpcpy (__stpcpy (proc_cpuinfo, proc_path), "/cpuinfo"); + + fp = fopen (proc_cpuinfo, "r"); + if (fp != NULL) + { + result = 0; + /* Read all lines and count the lines starting with the + string "processor". We don't have to fear extremely long + lines since the kernel will not generate them. 8192 + bytes are really enough. */ + while (fgets (buffer, sizeof buffer, fp) != NULL) + if (strncmp (buffer, "processor", 9) == 0) + ++result; + + fclose (fp); + } + } + + return result; +} +weak_alias (__get_nprocs, get_nprocs) + +/* As far as I know Linux has no separate numbers for configured and + available processors. So make the `get_nprocs_conf' function an + prototype. */ +strong_alias (__get_nprocs, __get_nprocs_conf) +weak_alias (__get_nprocs, get_nprocs_conf) + + +/* General function to get information about memory status from proc + filesystem. */ +static int +phys_pages_info (const char *format) +{ + FILE *fp; + char buffer[8192]; + char *proc_path; + int result = -1; + + /* Get mount point of proc filesystem. */ + proc_path = get_proc_path (buffer, sizeof buffer); + + /* If we haven't found an appropriate entry return 1. */ + if (proc_path != NULL) + { + char *proc_meminfo = alloca (strlen (proc_path) + sizeof ("/meminfo")); + __stpcpy (__stpcpy (proc_meminfo, proc_path), "/meminfo"); + + fp = fopen (proc_meminfo, "r"); + if (fp != NULL) + { + result = 0; + /* Read all lines and count the lines starting with the + string "processor". We don't have to fear extremely long + lines since the kernel will not generate them. 8192 + bytes are really enough. */ + while (fgets (buffer, sizeof buffer, fp) != NULL) + if (sscanf (buffer, format, &result) == 1) + { + result /= (__getpagesize () / 1024); + break; + } + + fclose (fp); + } + } + + if (result == -1) + /* We cannot get the needed value: signal an error. */ + errno = ENOSYS; + + return result; +} + + +/* Return the number of pages of physical memory in the system. There + is currently (as of version 2.0.21) no system call to determine the + number. It is planned for the 2.1.x series to add this, though. + + One possibility to implement it for systems using Linux 2.0 is to + examine the pseudo file /proc/cpuinfo. Here we have one entry for + each processor. + + But not all systems have support for the /proc filesystem. If it + is not available we return -1 as an error signal. */ +int +__get_phys_pages () +{ + /* XXX Here will come a test for the new system call. */ + + return phys_pages_info ("MemTotal: %d kB"); +} +weak_alias (__get_phys_pages, get_phys_pages) + + +/* Return the number of available pages of physical memory in the + system. There is currently (as of version 2.0.21) no system call + to determine the number. It is planned for the 2.1.x series to add + this, though. + + One possibility to implement it for systems using Linux 2.0 is to + examine the pseudo file /proc/cpuinfo. Here we have one entry for + each processor. + + But not all systems have support for the /proc filesystem. If it + is not available we return -1 as an error signal. */ +int +__get_avphys_pages () +{ + /* XXX Here will come a test for the new system call. */ + + return phys_pages_info ("MemFree: %d kB"); +} +weak_alias (__get_avphys_pages, get_avphys_pages) |