glibc/sysdeps/unix/sysv/linux/getsysstats.c
Greg McGary 2ed5fd9a2a update
2000-07-26  Greg McGary  <greg@mcgary.org>

	* Makeconfig (+link-bounded, link-libc-bounded,
	link-extra-libs-bounded): New variables.
	(built-program-cmd): Omit $(run-program-prefix) for static BP tests.
	* Makerules (do-tests-clean, common-mostlyclean): Remove BP test files.
	* Rules (tests-bp.out): New variable.
	(tests): Conditionally add BP tests.
	(binaries-bounded): Add variable and associated rule.
	* csu/Makefile [build-bounded] (extra-objs, install-lib):
	Move conditional stuff after place where condition is defined.

	* malloc/malloc.c (bp-checks.h): Add #include.
	(mem2chunk, chunk_at_offset, bin_at): Wrap BOUNDED_1 around expression.
	(_bin_at): Add unbounded version of bin_at.
	(IAV, chunk_alloc): Use unbounded _bin_at.
	(mALLOc, rEALLOc, chunk_realloc, mEMALIGn, cALLOc,
	chunk2mem_check, realloc_check, malloc_starter, malloc_atfork):
	Wrap BOUNDED_N around return value.
	(chunk_realloc): Adjust oldsize once.

	* sysdeps/generic/bp-checks.h (__memchr): Remove incorrect decl.
	(__ubp_memchr): Add correct decl.
	(_CHECK_STRING): Use __ubp_memchr.
	* sysdeps/alpha/memchr.S [!__BOUNDED_POINTERS__] (__ubp_memchr):
	New alias for unbounded-pointer __memchr.
	* sysdeps/i386/memchr.S: Likewise.
	* sysdeps/ia64/memchr.S: Likewise.
	* sysdeps/m68k/memchr.S: Likewise.
	* sysdeps/sparc/sparc32/memchr.S: Likewise.
	* sysdeps/sparc/sparc64/memchr.S: Likewise.
	* sysdeps/vax/memchr.s: Likewise.

	* sysdeps/i386/strtok.S: Fix bounds checks to pass tests.
	(SAVE_PTR): New macro.  (save_ptr): Expand size as BP.
	(strtok): Don't bother to write into SAVE_PTR when returning NULL.
	* sysdeps/i386/i686/strtok.S: Likewise.
	* sysdeps/i386/bp-asm.h (RETURN_BOUNDED_POINTER,
	RETURN_NULL_BOUNDED_POINTER): Use %ecx as the scratch register.

	* sysdeps/i386/bits/string.h [!__BOUNDED_POINTERS__]: Disable inlines.
	* sysdeps/i386/i486/bits/string.h [!__BOUNDED_POINTERS__]: Likewise.

	* sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path): Copy
	bounds of copy_result to mount_proc.
2000-07-26 18:21:25 +00:00

298 lines
8.6 KiB
C

/* Determine various system internal values, Linux version.
Copyright (C) 1996, 1997, 1998, 1999, 2000 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 <alloca.h>
#include <assert.h>
#include <errno.h>
#include <mntent.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/sysinfo.h>
#include <atomicity.h>
/* The default value for the /proc filesystem mount point. */
static const char path_proc[] = "/proc";
/* Actual mount point of /proc filesystem. */
static char *mount_proc;
/* Determine the path to the /proc filesystem if available. */
static const char *
internal_function
get_proc_path (char *buffer, size_t bufsize)
{
struct mntent mount_point;
struct mntent *entry;
char *result = NULL;
char *copy_result;
FILE *fp;
/* First find the mount point of the proc filesystem. */
fp = __setmntent (_PATH_MOUNTED, "r");
if (fp == NULL)
fp = __setmntent (_PATH_MNTTAB, "r");
if (fp != NULL)
{
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);
}
/* If we haven't found anything this is generally a bad sign but we
handle it gracefully. We return what is hopefully the right
answer (/proc) but we don't remember this. This will enable
programs which started before the system is fully running to
adjust themselves. */
if (result == NULL)
return path_proc;
/* Make a copy we can keep around. */
copy_result = __strdup (result);
if (copy_result == NULL)
return result;
/* Now store the copied value. But do it atomically. */
assert (sizeof (long int) == sizeof (void *__unbounded));
if (compare_and_swap ((long int *) &mount_proc, (long int) 0,
(long int) copy_result) == 0)
/* Replacing the value failed. This means another thread was
faster and we don't need the copy anymore. */
free (copy_result);
#if __BOUNDED_POINTERS__
else
{
/* compare_and_swap only copied the pointer value, so we must
now copy the bounds as well. */
__ptrlow (mount_proc) = __ptrlow (copy_result);
__ptrhigh (mount_proc) = __ptrhigh (copy_result);
}
#endif
return mount_proc;
}
/* 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/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 simply return 1 since there is no way. */
/* Other architectures use different formats for /proc/cpuinfo. This
provides a hook for alternative parsers. */
#ifndef GET_NPROCS_PARSER
# define GET_NPROCS_PARSER(FP, BUFFER, RESULT) \
do \
{ \
(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_unlocked (BUFFER, sizeof (BUFFER), FP) != NULL) \
if (strncmp (BUFFER, "processor", 9) == 0) \
++(RESULT); \
} \
while (0)
#endif
int
__get_nprocs ()
{
FILE *fp;
char buffer[8192];
const 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)
{
GET_NPROCS_PARSER (fp, buffer, result);
fclose (fp);
}
}
return result;
}
weak_alias (__get_nprocs, get_nprocs)
#ifdef GET_NPROCS_CONF_PARSER
/* On some architectures it is possible to distinguish between configured
and active cpus. */
int
__get_nprocs_conf ()
{
FILE *fp;
char buffer[8192];
const 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)
{
GET_NPROCS_CONF_PARSER (fp, buffer, result);
fclose (fp);
}
}
return result;
}
#else
/* As far as I know Linux has no separate numbers for configured and
available processors. So make the `get_nprocs_conf' function an
alias. */
strong_alias (__get_nprocs, __get_nprocs_conf)
#endif
weak_alias (__get_nprocs_conf, get_nprocs_conf)
/* General function to get information about memory status from proc
filesystem. */
static int
internal_function
phys_pages_info (const char *format)
{
FILE *fp;
char buffer[8192];
const 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_unlocked (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. */
__set_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)
static void
free_mem (void)
{
free (mount_proc);
}
text_set_element (__libc_subfreeres, free_mem);