init: stop using static data

function                                             old     new   delta
init_action_list                                       4       -      -4
new_init_action                                      148     142      -6
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-10)             Total: -10 bytes
   text	   data	    bss	    dec	    hex	filename
 927839	    481	   6832	 935152	  e44f0	busybox_old
 927833	    481	   6824	 935138	  e44e2	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 24 insertions, 16 deletions

diff --git a/init/init.c b/init/init.c
index 6f3374eac..cac165fc7 100644
--- a/init/init.c
+++ b/init/init.c
@@ -128,6 +128,7 @@
 #define DEBUG_SEGV_HANDLER 0
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include <syslog.h>
 #include <sys/resource.h>
 #ifdef __linux__
@@ -203,7 +204,6 @@
  */
 #define RESTART     0x80
 
-
 /* A linked list of init_actions, to be read from inittab */
 struct init_action {
         struct init_action *next;
@@ -213,11 +213,17 @@ struct init_action {
         char command[1];
 };
 
-static struct init_action *init_action_list = NULL;
-
+struct globals {
+        struct init_action *init_action_list;
 #if !ENABLE_FEATURE_INIT_SYSLOG
-static const char *log_console = VC_5;
+        const char *log_console;
 #endif
+} FIX_ALIASING;
+#define G (*(struct globals*)bb_common_bufsiz1)
+#define INIT_G() do { \
+        setup_common_bufsiz(); \
+        IF_NOT_FEATURE_INIT_SYSLOG(G.log_console = VC_5;) \
+} while (0)
 
 enum {
         L_LOG = 0x1,
@@ -265,10 +271,10 @@ static void message(int where, const char *fmt, ...)
 
                 if (log_fd < 0) {
                         log_fd = STDERR_FILENO;
-                        if (log_console) {
-                                log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
+                        if (G.log_console) {
+                                log_fd = device_open(G.log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
                                 if (log_fd < 0) {
-                                        bb_error_msg("can't log to %s", log_console);
+                                        bb_error_msg("can't log to %s", G.log_console);
                                         where = L_CONSOLE;
                                 } else {
                                         close_on_exec_on(log_fd);
@@ -328,7 +334,7 @@ static void console_init(void)
                 if (!s || strcmp(s, "linux") == 0)
                         putenv((char*)"TERM=vt102");
 # if !ENABLE_FEATURE_INIT_SYSLOG
-                log_console = NULL;
+                G.log_console = NULL;
 # endif
         } else
 #endif
@@ -562,7 +568,7 @@ static struct init_action *mark_terminated(pid_t pid)
 
         if (pid > 0) {
                 update_utmp_DEAD_PROCESS(pid);
-                for (a = init_action_list; a; a = a->next) {
+                for (a = G.init_action_list; a; a = a->next) {
                         if (a->pid == pid) {
                                 a->pid = 0;
                                 return a;
@@ -596,7 +602,7 @@ static void run_actions(int action_type)
 {
         struct init_action *a;
 
-        for (a = init_action_list; a; a = a->next) {
+        for (a = G.init_action_list; a; a = a->next) {
                 if (!(a->action_type & action_type))
                         continue;
 
@@ -630,7 +636,7 @@ static void new_init_action(uint8_t action_type, const char *command, const char
          * To achieve that, if we find a matching entry, we move it
          * to the end.
          */
-        nextp = &init_action_list;
+        nextp = &G.init_action_list;
         while ((a = *nextp) != NULL) {
                 /* Don't enter action if it's already in the list.
                  * This prevents losing running RESPAWNs.
@@ -845,7 +851,7 @@ static void exec_restart_action(void)
 {
         struct init_action *a;
 
-        for (a = init_action_list; a; a = a->next) {
+        for (a = G.init_action_list; a; a = a->next) {
                 if (!(a->action_type & RESTART))
                         continue;
 
@@ -923,7 +929,7 @@ static void reload_inittab(void)
         message(L_LOG, "reloading /etc/inittab");
 
         /* Disable old entries */
-        for (a = init_action_list; a; a = a->next)
+        for (a = G.init_action_list; a; a = a->next)
                 a->action_type = 0;
 
         /* Append new entries, or modify existing entries
@@ -936,14 +942,14 @@ static void reload_inittab(void)
 #if ENABLE_FEATURE_KILL_REMOVED
         /* Kill stale entries */
         /* Be nice and send SIGTERM first */
-        for (a = init_action_list; a; a = a->next)
+        for (a = G.init_action_list; a; a = a->next)
                 if (a->action_type == 0 && a->pid != 0)
                         kill(a->pid, SIGTERM);
         if (CONFIG_FEATURE_KILL_DELAY) {
                 /* NB: parent will wait in NOMMU case */
                 if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
                         sleep(CONFIG_FEATURE_KILL_DELAY);
-                        for (a = init_action_list; a; a = a->next)
+                        for (a = G.init_action_list; a; a = a->next)
                                 if (a->action_type == 0 && a->pid != 0)
                                         kill(a->pid, SIGKILL);
                         _exit(EXIT_SUCCESS);
@@ -955,7 +961,7 @@ static void reload_inittab(void)
          * We never rerun SYSINIT entries anyway,
          * removing them too saves a few bytes
          */
-        nextp = &init_action_list;
+        nextp = &G.init_action_list;
         while ((a = *nextp) != NULL) {
                 /*
                  * Why pid == 0 check?
@@ -1046,6 +1052,8 @@ static void sleep_much(void)
 int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int init_main(int argc UNUSED_PARAM, char **argv)
 {
+        INIT_G();
+
         if (argv[1] && strcmp(argv[1], "-q") == 0) {
                 return kill(1, SIGHUP);
         }