From: Alan Cox <alan@linux.intel.com>
Date: Mon, 8 Jun 2015 19:33:23 +0000 (+0100)
Subject: init: add telinit code
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=52ef7784f0386c03f5743e5797726d15df13bee6;p=FUZIX.git

init: add telinit code
---

diff --git a/Applications/build.mk b/Applications/build.mk
index c865e865..be586661 100644
--- a/Applications/build.mk
+++ b/Applications/build.mk
@@ -7,8 +7,8 @@ util_apps := \
 	decomp16 df dirname dosread du echo ed factor false fdisk fgrep fsck \
 	grep head id init kill ll ln logname ls man mkdir mkfs mkfifo mknod \
 	mount more mv od pagesize passwd patchcpm printenv prtroot ps pwd rm rmdir \
-	sleep ssh sort stty sum su sync tee tail touch tr true umount uniq \
-	uud uue wc which who whoami write xargs yes
+	sleep ssh sort stty sum su sync tee tail telinit touch tr true umount \
+	uniq uud uue wc which who whoami write xargs yes
 
 # ...and in V7/cmd.
 
diff --git a/Applications/util/Makefile b/Applications/util/Makefile
index 8c3f338f..284e59e2 100644
--- a/Applications/util/Makefile
+++ b/Applications/util/Makefile
@@ -46,6 +46,7 @@ SRCSNS = \
 	sum.c \
 	sync.c \
 	tee.c \
+	telinit.c \
 	touch.c \
 	tr.c \
 	true.c \
diff --git a/Applications/util/Makefile.6809 b/Applications/util/Makefile.6809
index cfc12f67..dd5c9a18 100644
--- a/Applications/util/Makefile.6809
+++ b/Applications/util/Makefile.6809
@@ -80,6 +80,7 @@ SRCS  = banner.c \
 	sync.c \
 	tee.c \
 	tail.c \
+	telinit.c \
 	touch.c \
 	tr.c \
 	true.c \
diff --git a/Applications/util/init.c b/Applications/util/init.c
index 2f97fb89..b76fedf5 100644
--- a/Applications/util/init.c
+++ b/Applications/util/init.c
@@ -56,18 +56,26 @@ static int initcount;
 int default_rl;
 int runlevel;
 
+volatile static int dingdong;
+
 void sigalarm(int sig)
 {
 	return;
 }
 
+void sigusr1(int sig)
+{
+	signal(SIGUSR1, sigusr1);
+	dingdong = 1;
+}
+
 int showfile(char *fname)
 {
 	int fd, len;
 	char buf[80];
 
 	fd = open(fname, O_RDONLY);
-	if (fd > 0) {
+	if (fd >= 0) {
 		do {
 			len = read(fd, buf, 80);
 			write(1, buf, len);
@@ -212,7 +220,7 @@ static uint8_t to_runlevel(uint8_t c)
 		return 7;		/* 1 << 7 is used for boot/single */
 	if (c >=  '0' && c <= '6')
 		return c - '0';
-	return -1;
+	return 0xFF;
 }
 
 /*
@@ -253,7 +261,7 @@ static void parse_initline(void)
 			return;
 		}
 		bit = to_runlevel(*sdata++);
-		if (bit == -1) {
+		if (bit == 0xFF) {
 			bad_line();
 			return;
 		}
@@ -461,7 +469,7 @@ int main(int argc, char *argv[])
 	int fdtty1;
 
 	signal(SIGINT, SIG_IGN);
-//	signal(SIGHUP, telinit);
+	signal(SIGUSR1, sigusr1);
 
 	/* remove any stale /etc/mtab file */
 
@@ -494,7 +502,17 @@ int main(int argc, char *argv[])
 
 	for (;;) {
 		clear_zombies(0);
-		/* FIXME: telinit handling, HUP handling */
+		if (dingdong) {
+			uint8_t newrl;
+			int fd = open("/var/run/intctl", O_RDONLY);
+			if (fd != -1 && read(fd, &newrl, 1) == 1) {
+				exit_runlevel(1 << runlevel, 1 << newrl);
+				runlevel = newrl;
+				enter_runlevel(1 << runlevel);
+			}
+			close(fd);
+			dingdong = 0;
+		}
 	}
 }
 
diff --git a/Applications/util/telinit.c b/Applications/util/telinit.c
new file mode 100644
index 00000000..5fe2f4b4
--- /dev/null
+++ b/Applications/util/telinit.c
@@ -0,0 +1,38 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+
+/*
+ *	Turn the character codes 0123456sS into run level numbers
+ */
+static uint8_t to_runlevel(uint8_t c)
+{
+	if (c == 's' || c == 'S')
+		return 7;		/* 1 << 7 is used for boot/single */
+	if (c >=  '0' && c <= '6')
+		return c - '0';
+	return 0xFF;
+}
+
+int main(int argc, char *argv[])
+{
+  int fd;
+  uint8_t v;
+  
+  if (argc != 2) {
+    write(2, "telinit: [runlevel]\n", 20);
+    exit(1);
+  }
+  if (argv[1][1] || (v = to_runlevel(argv[1][0])) == 0xFF) {
+    write(2, "telinit: invalid run level\n", 27);
+    exit(1);
+  }
+  fd = open("/var/run/initctl", O_WRONLY|O_TRUNC|O_CREAT, 0600);
+  if (fd < 0 || write(fd, &v, 1) != 1 || close(fd) == -1 || 
+      kill(1, SIGUSR1) < 0)
+  {
+    perror("telinit");
+    exit(1);
+  }
+  exit(0);
+}