TTY: Major overhaul, move to built-in getty

The TTY handling in Finit has always been a bit of a patch work.  This
commit is an attempt at a first cleanup and simplification.

Included is a brand new built-in getty which should work fine on both
virtual and serial consoles.  It is however completely untested on the
latter serial consoles.

Still TODO: add support for /etc/securetty, add support for actually
setting TERM when calling /bin/login.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

exec.c

@@ -26,16 +26,8 @@
 
 #include <ctype.h>		/* isdigit() */
 #include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
 #include <stdarg.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
 #include <sys/prctl.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
 #include <sys/wait.h>
 #include <lite/lite.h>
 
@@ -220,67 +212,23 @@ int run_interactive(char *cmd, char *fmt, ...)
 	return status;
 }
 
-pid_t run_getty(char *cmd, char *args[], char *tty, int console)
+int getty(char *tty, char *baud, char *term);
+
+pid_t run_getty(char *tty, char *speed, char *term, int console)
 {
 	pid_t pid = fork();
 
 	if (!pid) {
-		int  i, fd;
-		char c;
-		struct sigaction sa;
-
 		/* Reset signal handlers that were set by the parent process */
-		for (i = 1; i < NSIG; i++)
-			DFLSIG(sa, i, 0);
-
-		/* Detach from initial controlling TTY */
-		vhangup();
-
-		close(STDERR_FILENO);
-		close(STDOUT_FILENO);
-		close(STDIN_FILENO);
-
-		/* Attach TTY to console */
-		fd = open(tty, O_RDWR);
-		if (fd != STDIN_FILENO)
-			exit(1);
-
-		dup2(fd, STDIN_FILENO);
-		dup2(fd, STDOUT_FILENO);
-		dup2(fd, STDERR_FILENO);
+		sig_unblock();
+		setsid();
 
 		if (console)
 			prctl(PR_SET_NAME, "console", 0, 0, 0);
 		else
 			prctl(PR_SET_NAME, "finit-getty", 0, 0, 0);
 
-		sig_unblock();
-		setsid();
-
-		if (ioctl(STDIN_FILENO, TIOCSCTTY, 1) < 0)
-			_pe("Failed TIOCSCTTY");
-
-		while (!fexist(SYNC_SHUTDOWN)) {
-			static const char msg[] = "\nPlease press Enter to activate this console.";
-
-			if (fexist(SYNC_STOPPED)) {
-				sleep(1);
-				continue;
-			}
-
-			(void)write(STDERR_FILENO, msg, sizeof(msg));
-			while (read(STDIN_FILENO, &c, 1) == 1 && c != '\n')
-					continue;
-
-			if (fexist(SYNC_STOPPED))
-				continue;
-
-			execv(cmd, args);
-		}
-
-		close(fd);
-		vhangup();
-		exit(0);
+		_exit(getty(tty, speed, term));
 	}
 
 	return pid;