[OpenWrt-Devel] [PATCH procd 7/8] Show the shutdown sequence on the active virtual terminal

[Michel Stam]

procd by default writes to /dev/console. When rebooting, this means that the
terminal on which the reboot sequence was started will not see what is going
on. This patch fixes that by reopening stdin, stdout and stderr to /dev/tty0
upon reboot.

Also, due to (probably) pivot-root, /proc/1/fd shows 1-3 pointing to
/console. This patch also fixes that.

Signed-off-by: Michel Stam <m.stam at fugro.nl>
---
 state.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/state.c b/state.c
index e6c8712..2268de3 100644
--- a/state.c
+++ b/state.c
@@ -12,7 +12,9 @@
  * GNU General Public License for more details.
  */
 
+#include <fcntl.h>
 #include <sys/reboot.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/types.h>
@@ -37,6 +39,14 @@ enum {
 static int state = STATE_NONE;
 static int reboot_event;
 
+static void set_stdio( const char* tty )
+{
+	freopen( tty, "r", stdin );
+	freopen( tty, "w", stdout );
+	freopen( tty, "w", stderr );
+	fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
+}
+
 static void state_enter(void)
 {
 	char ubus_cmd[] = "/sbin/ubusd";
@@ -55,6 +65,7 @@ static void state_enter(void)
 		LOG("- ubus -\n");
 		procd_connect_ubus();
 
+		set_stdio( "/dev/console" );
 		LOG("- init -\n");
 		service_init();
 		service_start_early("ubus", ubus_cmd);
@@ -71,6 +82,8 @@ static void state_enter(void)
 		break;
 
 	case STATE_SHUTDOWN:
+		/* Redirect output to the current virtual terminal for the users' benefit */
+		set_stdio( "/dev/tty0" );
 		LOG("- shutdown -\n");
 		procd_inittab_run("shutdown");
 		sync();
-- 
1.7.12.1
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