Removing the pid 1 code

[Konstantin Belousov]

We have very special code executed during the libthr initialisation,
which attempts to set up session and controlling terminal when running
as pid 1. I do not see why do we need this, e.g. why behaviour of
a program must be different due to the presence of libthr and running as
pid 1.  The code is there from 1998' libc_r.

Please either provide arguments why should we do that, or agree with
the following change.  I decided to pre-resolve getpid() just in case,
as it is done by the current code, but even this is probably not neccessary.

diff --git a/lib/libthr/thread/thr_init.c b/lib/libthr/thread/thr_init.c
index 3c81299..f9f845b 100644
--- a/lib/libthr/thread/thr_init.c
+++ b/lib/libthr/thread/thr_init.c
@@ -305,7 +305,7 @@ _thread_init_hack(void)
 void
 _libpthread_init(struct pthread *curthread)
 {
-	int fd, first, dlopened;
+	int first, dlopened;
 
 	/* Check if this function has already been called: */
 	if ((_thr_initial != NULL) && (curthread == NULL))
@@ -321,27 +321,6 @@ _libpthread_init(struct pthread *curthread)
 	memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
 	__thr_interpose_libc();
 
-	/*
-	 * Check for the special case of this process running as
-	 * or in place of init as pid = 1:
-	 */
-	if ((_thr_pid = getpid()) == 1) {
-		/*
-		 * Setup a new session for this process which is
-		 * assumed to be running as root.
-		 */
-		if (setsid() == -1)
-			PANIC("Can't set session ID");
-		if (revoke(_PATH_CONSOLE) != 0)
-			PANIC("Can't revoke console");
-		if ((fd = __sys_openat(AT_FDCWD, _PATH_CONSOLE, O_RDWR)) < 0)
-			PANIC("Can't open console");
-		if (setlogin("root") == -1)
-			PANIC("Can't set login to root");
-		if (_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
-			PANIC("Can't set controlling terminal");
-	}
-
 	/* Initialize pthread private data. */
 	init_private();
 
diff --git a/lib/libthr/thread/thr_rtld.c b/lib/libthr/thread/thr_rtld.c
index cb20098..6c407d1 100644
--- a/lib/libthr/thread/thr_rtld.c
+++ b/lib/libthr/thread/thr_rtld.c
@@ -227,6 +227,7 @@ _thr_rtld_init(void)
 	_rtld_atfork_post(NULL);
 	_malloc_prefork();
 	_malloc_postfork();
+	getpid();
 	syscall(SYS_getpid);
 
 	/* mask signals, also force to resolve __sys_sigprocmask PLT */