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authorUlrich Drepper <drepper@redhat.com>2000-07-06 00:44:01 +0000
committerUlrich Drepper <drepper@redhat.com>2000-07-06 00:44:01 +0000
commit77432371acbde32fad2c0ee200c94da21dbaf70d (patch)
tree22ed5f839a237397b4ee775edc26d884861214fc
parent11b3488225fff62fe08631c3d2a2d2ec6c48d90c (diff)
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Update.
* sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path): Cache result. Search first in /etc/mtab (proc/mounts would be stupid). If mount not in the file fall back on /proc.
-rw-r--r--ChangeLog4
-rw-r--r--sysdeps/unix/sysv/linux/getsysstats.c62
2 files changed, 56 insertions, 10 deletions
diff --git a/ChangeLog b/ChangeLog
index c844d9b19f..8eb0e46af3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
2000-07-05 Ulrich Drepper <drepper@redhat.com>
+ * sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path): Cache
+ result. Search first in /etc/mtab (proc/mounts would be stupid).
+ If mount not in the file fall back on /proc.
+
* crypt/md5-crypt.c (__md5_crypt_r): Clear arrays the key and salt
string got copied in.
Patch by Solar Designer <solar@false.com>.
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
index be23753d2f..45b5eafb00 100644
--- a/sysdeps/unix/sysv/linux/getsysstats.c
+++ b/sysdeps/unix/sysv/linux/getsysstats.c
@@ -1,5 +1,5 @@
/* Determine various system internal values, Linux version.
- Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+ 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.
@@ -19,32 +19,45 @@
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 char *
+static const char *
internal_function
get_proc_path (char *buffer, size_t bufsize)
{
- FILE *fp;
struct mntent mount_point;
struct mntent *entry;
- char *result = NULL;
+ char *result;
+ char *copy_result;
+ FILE *fp;
/* First find the mount point of the proc filesystem. */
- fp = __setmntent (_PATH_MNTTAB, "r");
+ 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)
+ if (strcmp (mount_point.mnt_type, path_proc) == 0)
{
result = mount_point.mnt_dir;
break;
@@ -52,7 +65,28 @@ get_proc_path (char *buffer, size_t bufsize)
__endmntent (fp);
}
- return result;
+ /* 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 strore the copied value. But do it atomically. */
+ assert (sizeof (long int) == sizeof (void *));
+ 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);
+
+ return mount_proc;
}
@@ -91,7 +125,7 @@ __get_nprocs ()
{
FILE *fp;
char buffer[8192];
- char *proc_path;
+ const char *proc_path;
int result = 1;
/* XXX Here will come a test for the new system call. */
@@ -126,7 +160,7 @@ __get_nprocs_conf ()
{
FILE *fp;
char buffer[8192];
- char *proc_path;
+ const char *proc_path;
int result = 1;
/* XXX Here will come a test for the new system call. */
@@ -166,7 +200,7 @@ phys_pages_info (const char *format)
{
FILE *fp;
char buffer[8192];
- char *proc_path;
+ const char *proc_path;
int result = -1;
/* Get mount point of proc filesystem. */
@@ -244,3 +278,11 @@ __get_avphys_pages ()
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);