From f4d507d5fe92f643dff267c87a2010a25cb7f2c4 Mon Sep 17 00:00:00 2001
From: dlezcano <dlezcano>
Date: Tue, 9 Sep 2008 14:35:44 +0000
Subject: [PATCH] Added console support

---
 src/lxc/start.c | 54 ++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 47 insertions(+), 7 deletions(-)

diff --git a/src/lxc/start.c b/src/lxc/start.c
index 3a99c7cc8..be32fa6bd 100644
--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -32,6 +32,7 @@
 #include <signal.h>
 #include <sys/param.h>
 #include <sys/file.h>
+#include <sys/mount.h>
 #include <sys/types.h>
 #include <sys/prctl.h>
 #include <sys/wait.h>
@@ -41,14 +42,40 @@
 LXC_TTY_HANDLER(SIGINT);
 LXC_TTY_HANDLER(SIGQUIT);
 
+int opentty(const char *ttyname)
+{
+        int i, fd, flags;
+
+        fd = open(ttyname, O_RDWR | O_NONBLOCK);
+        if (fd == -1) {
+		lxc_log_syserror("open '%s'", ttyname);
+		return -1;
+        }
+
+        flags = fcntl(fd, F_GETFL);
+        flags &= ~O_NONBLOCK;
+        fcntl(fd, F_SETFL, flags);
+
+        for (i = 0; i < fd; i++)
+                close(i);
+        for (i = 0; i < 3; i++)
+                if (fd != i)
+                        dup2(fd, i);
+        if (fd >= 3)
+                close(fd);
+
+	return 0;
+}
+
 int lxc_start(const char *name, int argc, char *argv[], 
 	      lxc_callback_t prestart, void *data)
 {
 	char *init = NULL, *val = NULL;
+	char ttyname[MAXPATHLEN];
 	int fd, lock, sv[2], sync = 0, err = -1;
 	pid_t pid;
 	int clone_flags;
-	
+
 	lock = lxc_get_lock(name);
 	if (!lock) {
 		lxc_log_error("'%s' is busy", name);
@@ -61,27 +88,29 @@ int lxc_start(const char *name, int argc, char *argv[],
 		return -1;
 	}
 
-	fcntl(lock, F_SETFD, FD_CLOEXEC);
-
 	/* Begin the set the state to STARTING*/
 	if (lxc_setstate(name, STARTING)) {
 		lxc_log_error("failed to set state %s", lxc_state2str(STARTING));
 		goto out;
 	}
 
+	if (readlink("/proc/self/fd/0", ttyname, sizeof(ttyname)) < 0) {
+		lxc_log_syserror("failed to read '/proc/self/fd/0'");
+		goto out;
+	}
+
+
 	/* Synchro socketpair */
 	if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv)) {
 		lxc_log_syserror("failed to create communication socketpair");
-		goto err;
+		goto out;
 	}
 
 	/* Avoid signals from terminal */
 	LXC_TTY_ADD_HANDLER(SIGINT);
 	LXC_TTY_ADD_HANDLER(SIGQUIT);
 
-	clone_flags = CLONE_NEWPID|CLONE_NEWIPC;
-	if (conf_has_fstab(name))
-		clone_flags |= CLONE_NEWNS;
+	clone_flags = CLONE_NEWPID|CLONE_NEWIPC|CLONE_NEWNS;
 	if (conf_has_utsname(name))
 		clone_flags |= CLONE_NEWUTS;
 	if (conf_has_network(name))
@@ -121,6 +150,17 @@ int lxc_start(const char *name, int argc, char *argv[],
 			return -1;
 		}
 
+		/* Open the tty */
+		if (opentty(ttyname)) {
+			lxc_log_syserror("failed to open the tty");
+			return -1;
+		}
+
+		if (mount(ttyname, "/dev/console", "none", MS_BIND, 0)) {
+			lxc_log_syserror("failed to mount '/dev/console'");
+			return -1;
+		}
+
 		/* If a callback has been passed, call it before doing exec */
 		if (prestart)
 			if (prestart(name, argc, argv, data)) {