find_stray_communal_vars: script which finds communal variables

resize: remove globals var
mdev: remove globals var

4 files changed, 25 insertions, 18 deletions

diff --git a/console-tools/resize.c b/console-tools/resize.c
index 52fdb26f4..32551b2f2 100644
--- a/console-tools/resize.c
+++ b/console-tools/resize.c
@@ -11,16 +11,15 @@
 
 #define ESC "\033"
 
-struct termios old;
+#define old_termios (*(struct termios*)&bb_common_bufsiz1)
 
 static void
 onintr(int sig ATTRIBUTE_UNUSED)
 {
-        tcsetattr(STDERR_FILENO, TCSANOW, &old);
+        tcsetattr(STDERR_FILENO, TCSANOW, &old_termios);
         exit(1);
 }
 
-
 int resize_main(int argc, char **argv);
 int resize_main(int argc, char **argv)
 {
@@ -34,8 +33,8 @@ int resize_main(int argc, char **argv)
          * and operate on it - should we do the same?
          */
 
-        tcgetattr(STDERR_FILENO, &old); /* fiddle echo */
-        new = old;
+        tcgetattr(STDERR_FILENO, &old_termios); /* fiddle echo */
+        new = old_termios;
         new.c_cflag |= (CLOCAL | CREAD);
         new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
         signal(SIGINT, onintr);
@@ -60,7 +59,7 @@ int resize_main(int argc, char **argv)
          * (gotten via TIOCGWINSZ) and recomputing *pixel values */
         ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
 
-        tcsetattr(STDERR_FILENO, TCSANOW, &old);
+        tcsetattr(STDERR_FILENO, TCSANOW, &old_termios);
 
         if (ENABLE_FEATURE_RESIZE_PRINT)
                 printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
diff --git a/networking/telnet.c b/networking/telnet.c
index a59450505..caca89d2d 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -79,7 +79,7 @@ struct globals {
         struct termios termios_raw;
 };
 
-#define G (*(struct globals*)bb_common_bufsiz1)
+#define G (*(struct globals*)&bb_common_bufsiz1)
 
 
 /* Function prototypes */
diff --git a/scripts/find_stray_communal_vars b/scripts/find_stray_communal_vars
new file mode 100755
index 000000000..9f999d705
--- /dev/null
+++ b/scripts/find_stray_communal_vars
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# Communal variables are elusize, then don't show in size output!
+# This script will show all communals in *.o, sorted by size
+
+find -name '*.o' \
+| while read name; do
+    b=`basename "$name"`
+    nm "$name" | sed "s/^/$b: /"
+done | grep -i ' c ' | sort -k2
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index a4716e2da..cc729e72a 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -12,14 +12,12 @@
 #include "libbb.h"
 #include "xregex.h"
 
-#define DEV_PATH        "/dev"
-
-struct mdev_globals
-{
+struct globals {
         int root_major, root_minor;
-} mdev_globals;
-
-#define bbg mdev_globals
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define root_major (G.root_major)
+#define root_minor (G.root_minor)
 
 /* mknod in /dev based on a path like "/sys/block/hda/hda1" */
 static void make_device(char *path, int delete)
@@ -174,7 +172,7 @@ static void make_device(char *path, int delete)
                 if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
                         bb_perror_msg_and_die("mknod %s", device_name);
 
-                if (major == bbg.root_major && minor == bbg.root_minor)
+                if (major == root_major && minor == root_minor)
                         symlink(device_name, "root");
 
                 if (ENABLE_FEATURE_MDEV_CONF) chown(device_name, uid, gid);
@@ -237,7 +235,7 @@ int mdev_main(int argc, char **argv)
         char *env_path;
         RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
 
-        xchdir(DEV_PATH);
+        xchdir("/dev");
 
         /* Scan */
 
@@ -245,8 +243,8 @@ int mdev_main(int argc, char **argv)
                 struct stat st;
 
                 xstat("/", &st);
-                bbg.root_major = major(st.st_dev);
-                bbg.root_minor = minor(st.st_dev);
+                root_major = major(st.st_dev);
+                root_minor = minor(st.st_dev);
                 strcpy(temp,"/sys/block");
                 find_dev(temp);
                 strcpy(temp,"/sys/class");