From 04bb2d2d06a87b08743ee997fcd8465bfed809d1 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Tue, 26 Feb 2008 16:08:02 +0000
Subject: [PATCH] start_stop_daemon: stop using data/bss

function                                             old     new   delta
start_stop_daemon_main                               749     770     +21
do_procinit                                          184     185      +1
quiet                                                  1       -      -1
userspec                                               4       -      -4
user_id                                                4       -      -4
signal_nr                                              4       -      -4
pidfile                                                4       -      -4
found                                                  4       -      -4
execname                                               4       -      -4
cmdname                                                4       -      -4
------------------------------------------------------------------------------
(add/remove: 0/8 grow/shrink: 2/0 up/down: 22/-29)             Total: -7 bytes
---
 debianutils/start_stop_daemon.c | 49 +++++++++++++++++++++++----------
 1 file changed, 34 insertions(+), 15 deletions(-)

diff --git a/debianutils/start_stop_daemon.c b/debianutils/start_stop_daemon.c
index 6860bab6b..6f4b6b2bb 100644
--- a/debianutils/start_stop_daemon.c
+++ b/debianutils/start_stop_daemon.c
@@ -18,20 +18,37 @@
 #define WANT_PIDFILE 1
 #include "libbb.h"
 
-static int signal_nr = 15;
-static int user_id = -1;
-static char *userspec;
-static char *cmdname;
-static char *execname;
-static char *pidfile;
-static smallint quiet;
-
 struct pid_list {
 	struct pid_list *next;
 	pid_t pid;
 };
 
-static struct pid_list *found;
+
+struct globals {
+	struct pid_list *found;
+	char *userspec;
+	char *cmdname;
+	char *execname;
+	char *pidfile;
+	int user_id;
+	smallint quiet;
+	smallint signal_nr;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define found             (G.found               )
+#define userspec          (G.userspec            )
+#define cmdname           (G.cmdname             )
+#define execname          (G.execname            )
+#define pidfile           (G.pidfile             )
+#define user_id           (G.user_id             )
+#define quiet             (G.quiet               )
+#define signal_nr         (G.signal_nr           )
+#define INIT_G() \
+        do { \
+		user_id = -1; \
+		signal_nr = 15; \
+        } while (0)
+
 
 static int pid_is_exec(pid_t pid, const char *name)
 {
@@ -43,8 +60,8 @@ static int pid_is_exec(pid_t pid, const char *name)
 	n = strlen(name) + 1;
 	execbuf = xzalloc(n + 1);
 	readlink(buf, execbuf, n);
-
-	/* if readlink fails, execbuf still contains "" */
+	/* if readlink fails because link target is longer than strlen(name),
+	 * execbuf still contains "", and strcmp will return !0. */
 	n = strcmp(execbuf, name);
 	if (ENABLE_FEATURE_CLEAN_UP)
 		free(execbuf);
@@ -121,7 +138,7 @@ static void do_procinit(void)
 {
 	DIR *procdir;
 	struct dirent *entry;
-	int foundany, pid;
+	int pid;
 
 	if (pidfile) {
 		do_pidfile();
@@ -130,16 +147,15 @@ static void do_procinit(void)
 
 	procdir = xopendir("/proc");
 
-	foundany = 0;
+	pid = 0;
 	while ((entry = readdir(procdir)) != NULL) {
 		pid = bb_strtou(entry->d_name, NULL, 10);
 		if (errno)
 			continue;
-		foundany++;
 		check(pid);
 	}
 	closedir(procdir);
-	if (!foundany)
+	if (!pid)
 		bb_error_msg_and_die("nothing in /proc - not mounted?");
 }
 
@@ -246,6 +262,9 @@ int start_stop_daemon_main(int argc, char **argv)
 //	int retries = -1;
 	char *opt_N;
 #endif
+
+	INIT_G();
+
 #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
 	applet_long_options = start_stop_daemon_longopts;
 #endif