applying patch from bug 24:

    0000024 03-16-05 patch: allow init to set controlling tty

diff --git a/init/Config.in b/init/Config.in
index 521f8fe1d4dcfd533702bff716199d63f94a8bcb..a3584aaf52d6862a965736b6e327af7173139bfe 100644 (file)
--- a/init/Config.in
+++ b/init/Config.in
@@ -43,6 +43,17 @@ config CONFIG_FEATURE_INIT_SWAPON
          If the system has less than one megabyte of total memory, init
          will run '/sbin/swapon -a' to add swap memory.
 
+config CONFIG_FEATURE_INIT_SCTTY
+       bool "  Support running commands with a controlling-tty?"
+       default n
+       depends on CONFIG_INIT
+       help
+         If this option is enabled a command starting with hyphen (-)
+         is run in its own session (setsid(2)) and possibly with a
+         controlling tty (TIOCSCTTY).  This is not the traditional init
+         behavour, but is often what you want in an embedded system where
+         the console is only accessed during development or for maintenance.
+
 config CONFIG_FEATURE_EXTRA_QUIET
        bool "  Should init be _extra_ quiet on boot?"
        default y

diff --git a/init/init.c b/init/init.c
index 8687b106c8b690a044cf10178ab0bab0eb4d5e7a..0f49a45d8542fc157ef646d76191595e3ac2f312 100644 (file)
--- a/init/init.c
+++ b/init/init.c
@@ -577,6 +577,13 @@ static pid_t run(const struct init_action *a)
                                cmd[0][0] = '-';
                                strcpy(cmd[0] + 1, s);
                        }
+#ifdef CONFIG_FEATURE_INIT_SCTTY
+                       /* Establish this process as session leader and
+                        * (attempt) to make the tty (if any) a controlling tty.
+                        */
+                       (void) setsid();
+                       (void) ioctl(0, TIOCSCTTY, 0/*don't steal it*/);
+#endif
                }
 
 #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)