From 3ab3080bc2c52216b5f4fb2ffbef74ec5e6c1d86 Mon Sep 17 00:00:00 2001
From: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Date: Tue, 30 May 2006 12:10:29 +0000
Subject: [PATCH] - use config_buffer for message() - add second argument to
 waitfor(*action,pid); if action==NULL then use pid tor   wait for. If an
 action was given, we wait for the action to finish just as   before. In run()
 remove second and third occurance of the same functionality   the waitfor()
 call now provides.   Adjust the former only caller of waitfor accordingly.

PS: Not using waitfor but creating a second function used a few bytes more than
simply extending and reusing waitfor.
   text    data     bss     dec     hex filename
   5426      32       8    5466    155a init/init.o.orig
   5391      32       8    5431    1537 init/init.o
---
 init/init.c | 39 ++++++++++++++-------------------------
 1 file changed, 14 insertions(+), 25 deletions(-)

diff --git a/init/init.c b/init/init.c
index 10cb015dd..9cbe8189a 100644
--- a/init/init.c
+++ b/init/init.c
@@ -174,7 +174,7 @@ static const char * const environment[] = {
 
 /* Function prototypes */
 static void delete_init_action(struct init_action *a);
-static int waitfor(const struct init_action *a);
+static int waitfor(const struct init_action *a, pid_t pid);
 static void halt_signal(int sig);
 
 
@@ -200,14 +200,14 @@ static void message(int device, const char *fmt, ...)
 {
 	va_list arguments;
 	int l;
-	char msg[1024];
+	RESERVE_CONFIG_BUFFER(msg, 1024);
 #ifndef CONFIG_SYSLOGD
 	static int log_fd = -1;
 #endif
 
 	msg[0] = '\r';
 		va_start(arguments, fmt);
-	l = vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments) + 1;
+	l = vsnprintf(msg + 1, 1024 - 2, fmt, arguments) + 1;
 		va_end(arguments);
 
 #ifdef CONFIG_SYSLOGD
@@ -258,6 +258,7 @@ static void message(int device, const char *fmt, ...)
 #endif
 		}
 	}
+	RELEASE_CONFIG_BUFFER(msg);
 }
 
 /* Set terminal settings to reasonable defaults */
@@ -400,7 +401,7 @@ static void open_new_terminal(const char *device, char fail) {
 
 static pid_t run(const struct init_action *a)
 {
-	int i, junk;
+	int i;
 	pid_t pid;
 	char *s, *tmpCmd, *cmd[INIT_BUFFS_SIZE], *cmdpath;
 	char buf[INIT_BUFFS_SIZE + 6];	/* INIT_BUFFS_SIZE+strlen("exec ")+1 */
@@ -452,7 +453,6 @@ static pid_t run(const struct init_action *a)
 		/* If the init Action requires us to wait, then force the
 		 * supplied terminal to be the controlling tty. */
 		if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
-			pid_t pgrp, tmp_pid;
 
 			/* Now fork off another process to just hang around */
 			if ((pid = fork()) < 0) {
@@ -468,17 +468,9 @@ static pid_t run(const struct init_action *a)
 				signal(SIGQUIT, SIG_IGN);
 				signal(SIGCHLD, SIG_DFL);
 
-				/* Wait for child to exit */
-				while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
-					if (tmp_pid == -1 && errno == ECHILD) {
-						break;
-					}
-					/* FIXME handle other errors */
-				}
-
+				waitfor(NULL, pid);
 				/* See if stealing the controlling tty back is necessary */
-				pgrp = tcgetpgrp(0);
-				if (pgrp != getpid())
+				if (tcgetpgrp(0) != getpid())
 					_exit(0);
 
 				/* Use a temporary process to steal the controlling tty. */
@@ -491,10 +483,7 @@ static pid_t run(const struct init_action *a)
 					ioctl(0, TIOCSCTTY, 1);
 					_exit(0);
 				}
-				while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
-					if (tmp_pid < 0 && errno == ECHILD)
-						break;
-				}
+				waitfor(NULL, pid);
 				_exit(0);
 			}
 
@@ -603,15 +592,15 @@ static pid_t run(const struct init_action *a)
 	return pid;
 }
 
-static int waitfor(const struct init_action *a)
+static int waitfor(const struct init_action *a, pid_t pid)
 {
-	int pid;
+	int runpid;
 	int status, wpid;
 
-	pid = run(a);
+	runpid = (NULL == a)? pid : run(a);
 	while (1) {
-		wpid = waitpid(pid,&status,0);
-		if (wpid == pid)
+		wpid = waitpid(runpid,&status,0);
+		if (wpid == runpid)
 			break;
 		if (wpid == -1 && errno == ECHILD) {
 			/* we missed its termination */
@@ -634,7 +623,7 @@ static void run_actions(int action)
 			if (access(a->terminal, R_OK | W_OK)) {
 				delete_init_action(a);
 			} else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
-				waitfor(a);
+				waitfor(a, 0);
 				delete_init_action(a);
 			} else if (a->action & ONCE) {
 				run(a);