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215 lines
6.3 KiB
C
215 lines
6.3 KiB
C
/* Determine various system internal values, Linux version.
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Copyright (C) 1996-2001, 2002, 2003, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <alloca.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <mntent.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/sysinfo.h>
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#include <atomic.h>
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/* How we can determine the number of available processors depends on
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the configuration. There is currently (as of version 2.0.21) no
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system call to determine the number. It is planned for the 2.1.x
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series to add this, though.
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One possibility to implement it for systems using Linux 2.0 is to
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examine the pseudo file /proc/cpuinfo. Here we have one entry for
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each processor.
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But not all systems have support for the /proc filesystem. If it
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is not available we simply return 1 since there is no way. */
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/* Other architectures use different formats for /proc/cpuinfo. This
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provides a hook for alternative parsers. */
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#ifndef GET_NPROCS_PARSER
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# define GET_NPROCS_PARSER(FP, BUFFER, RESULT) \
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do \
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{ \
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(RESULT) = 0; \
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/* Read all lines and count the lines starting with the string \
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"processor". We don't have to fear extremely long lines since \
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the kernel will not generate them. 8192 bytes are really \
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enough. */ \
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while (fgets_unlocked (BUFFER, sizeof (BUFFER), FP) != NULL) \
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if (strncmp (BUFFER, "processor", 9) == 0) \
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++(RESULT); \
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} \
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while (0)
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#endif
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int
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__get_nprocs ()
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{
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char buffer[8192];
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int result = 1;
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/* XXX Here will come a test for the new system call. */
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/* The /proc/stat format is more uniform, use it by default. */
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FILE *fp = fopen ("/proc/stat", "rc");
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if (fp != NULL)
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{
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/* No threads use this stream. */
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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result = 0;
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while (fgets_unlocked (buffer, sizeof (buffer), fp) != NULL)
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if (strncmp (buffer, "cpu", 3) == 0 && isdigit (buffer[3]))
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++result;
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fclose (fp);
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}
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else
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{
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fp = fopen ("/proc/cpuinfo", "rc");
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if (fp != NULL)
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{
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/* No threads use this stream. */
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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GET_NPROCS_PARSER (fp, buffer, result);
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fclose (fp);
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}
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}
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return result;
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}
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weak_alias (__get_nprocs, get_nprocs)
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#ifdef GET_NPROCS_CONF_PARSER
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/* On some architectures it is possible to distinguish between configured
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and active cpus. */
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int
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__get_nprocs_conf ()
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{
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char buffer[8192];
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int result = 1;
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/* XXX Here will come a test for the new system call. */
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/* If we haven't found an appropriate entry return 1. */
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FILE *fp = fopen ("/proc/cpuinfo", "rc");
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if (fp != NULL)
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{
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/* No threads use this stream. */
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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GET_NPROCS_CONF_PARSER (fp, buffer, result);
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fclose (fp);
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}
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return result;
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}
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#else
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/* As far as I know Linux has no separate numbers for configured and
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available processors. So make the `get_nprocs_conf' function an
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alias. */
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strong_alias (__get_nprocs, __get_nprocs_conf)
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#endif
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weak_alias (__get_nprocs_conf, get_nprocs_conf)
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/* General function to get information about memory status from proc
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filesystem. */
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static long int
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internal_function
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phys_pages_info (const char *format)
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{
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char buffer[8192];
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long int result = -1;
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/* If we haven't found an appropriate entry return 1. */
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FILE *fp = fopen ("/proc/meminfo", "rc");
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if (fp != NULL)
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{
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/* No threads use this stream. */
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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result = 0;
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/* Read all lines and count the lines starting with the
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string "processor". We don't have to fear extremely long
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lines since the kernel will not generate them. 8192
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bytes are really enough. */
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while (fgets_unlocked (buffer, sizeof buffer, fp) != NULL)
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if (sscanf (buffer, format, &result) == 1)
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{
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result /= (__getpagesize () / 1024);
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break;
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}
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fclose (fp);
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}
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if (result == -1)
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/* We cannot get the needed value: signal an error. */
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__set_errno (ENOSYS);
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return result;
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}
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/* Return the number of pages of physical memory in the system. There
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is currently (as of version 2.0.21) no system call to determine the
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number. It is planned for the 2.1.x series to add this, though.
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One possibility to implement it for systems using Linux 2.0 is to
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examine the pseudo file /proc/cpuinfo. Here we have one entry for
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each processor.
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But not all systems have support for the /proc filesystem. If it
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is not available we return -1 as an error signal. */
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long int
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__get_phys_pages ()
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{
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/* XXX Here will come a test for the new system call. */
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return phys_pages_info ("MemTotal: %ld kB");
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}
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weak_alias (__get_phys_pages, get_phys_pages)
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/* Return the number of available pages of physical memory in the
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system. There is currently (as of version 2.0.21) no system call
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to determine the number. It is planned for the 2.1.x series to add
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this, though.
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One possibility to implement it for systems using Linux 2.0 is to
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examine the pseudo file /proc/cpuinfo. Here we have one entry for
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each processor.
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But not all systems have support for the /proc filesystem. If it
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is not available we return -1 as an error signal. */
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long int
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__get_avphys_pages ()
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{
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/* XXX Here will come a test for the new system call. */
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return phys_pages_info ("MemFree: %ld kB");
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}
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weak_alias (__get_avphys_pages, get_avphys_pages)
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