util-linux/2.24-agetty-clocal.patch

diff -up util-linux-2.23.2/term-utils/agetty.c.kzak util-linux-2.23.2/term-utils/agetty.c
--- util-linux-2.23.2/term-utils/agetty.c.kzak	2013-07-30 11:14:18.124912322 +0200
+++ util-linux-2.23.2/term-utils/agetty.c	2013-09-09 09:07:46.406689270 +0200
@@ -132,13 +132,20 @@ struct options {
	int delay;			/* Sleep seconds before prompt */
	int nice;			/* Run login with this priority */
	int numspeed;			/* number of baud rates to try */
+	int clocal;			/* CLOCAL_MODE_* */
	speed_t speeds[MAX_SPEED];	/* baud rates to be tried */
 };

+enum {
+	CLOCAL_MODE_AUTO = 0,
+	CLOCAL_MODE_ALWAYS,
+	CLOCAL_MODE_NEVER
+};
+
 #define	F_PARSE		(1<<0)	/* process modem status messages */
 #define	F_ISSUE		(1<<1)	/* display /etc/issue */
 #define	F_RTSCTS	(1<<2)	/* enable RTS/CTS flow control */
-#define F_LOCAL		(1<<3)	/* force local */
+
 #define F_INITSTRING    (1<<4)	/* initstring is set */
 #define F_WAITCRLF	(1<<5)	/* wait for CR or LF */
 #define F_CUSTISSUE	(1<<6)	/* give alternative issue file */
@@ -235,10 +242,13 @@ static void login_options_to_argv(char *
 static char *fakehost;

 #ifdef DEBUGGING
-#define debug(s) do { fprintf(dbf,s); fflush(dbf); } while (0)
+# ifndef DEBUG_OUTPUT
+#  define DEBUG_OUTPUT "/dev/ttyp0"
+# endif
+# define debug(s) do { fprintf(dbf,s); fflush(dbf); } while (0)
 FILE *dbf;
 #else
-#define debug(s) do { ; } while (0)
+# define debug(s) do { ; } while (0)
 #endif

 int main(int argc, char **argv)
@@ -270,7 +280,7 @@ int main(int argc, char **argv)
	sigaction(SIGINT, &sa, &sa_int);

 #ifdef DEBUGGING
-	dbf = fopen("/dev/ttyp0", "w");
+	dbf = fopen(DEBUG_OUTPUT, "w");
	for (int i = 1; i < argc; i++)
		debug(argv[i]);
 #endif				/* DEBUGGING */
@@ -311,8 +321,10 @@ int main(int argc, char **argv)
			   strlen(options.initstring));
	}

-	if (!serial_tty_option(&options, F_LOCAL))
-		/* Go to blocking write mode unless -L is specified. */
+	if (options.flags & F_VCONSOLE || options.clocal != CLOCAL_MODE_ALWAYS)
+		/* Go to blocking mode unless -L is specified, this change
+		 * affects stdout, stdin and stderr as all the file descriptors
+		 * are created by dup().   */
		fcntl(STDOUT_FILENO, F_SETFL,
		      fcntl(STDOUT_FILENO, F_GETFL, 0) & ~O_NONBLOCK);

@@ -420,6 +432,12 @@ int main(int argc, char **argv)
				options.tty);
	}

+#ifdef DEBUGGING
+	fprintf(dbf, "read %c\n", ch);
+	if (close_stream(dbf) != 0)
+		log_err("write failed: %s", DEBUG_OUTPUT);
+#endif
+
	/* Let the login program take care of password validation. */
	execv(options.login, login_argv);
	log_err(_("%s: can't exec %s: %m"), options.tty, login_argv[0]);
@@ -534,7 +552,7 @@ static void parse_args(int argc, char **
		{  "init-string",    required_argument,  0,  'I'  },
		{  "noclear",	     no_argument,	 0,  'J'  },
		{  "login-program",  required_argument,  0,  'l'  },
-		{  "local-line",     no_argument,	 0,  'L'  },
+		{  "local-line",     optional_argument,	 0,  'L'  },
		{  "extract-baud",   no_argument,	 0,  'm'  },
		{  "skip-login",     no_argument,	 0,  'n'  },
		{  "nonewline",	     no_argument,	 0,  'N'  },
@@ -603,7 +621,18 @@ static void parse_args(int argc, char **
			op->login = optarg;
			break;
		case 'L':
-			op->flags |= F_LOCAL;
+			/* -L and -L=always have the same meaning */
+			op->clocal = CLOCAL_MODE_ALWAYS;
+			if (optarg) {
+				if (strcmp(optarg, "=always") == 0)
+					op->clocal = CLOCAL_MODE_ALWAYS;
+				else if (strcmp(optarg, "=never") == 0)
+					op->clocal = CLOCAL_MODE_NEVER;
+				else if (strcmp(optarg, "=auto") == 0)
+					op->clocal = CLOCAL_MODE_AUTO;
+				else
+					log_err(_("unssuported --local-line mode argument"));
+			}
			break;
		case 'm':
			op->flags |= F_PARSE;
@@ -1090,8 +1119,19 @@ static void termio_init(struct options *
	cfsetispeed(tp, ispeed);
	cfsetospeed(tp, ospeed);

-	if (op->flags & F_LOCAL)
-		tp->c_cflag |= CLOCAL;
+	/* The default is to follow setting from kernel, but it's possible
+	 * to explicitly remove/add CLOCAL flag by -L[=<mode>]*/
+	switch (op->clocal) {
+	case CLOCAL_MODE_ALWAYS:
+		tp->c_cflag |= CLOCAL;		/* -L or -L=always */
+		break;
+	case CLOCAL_MODE_NEVER:
+		tp->c_cflag &= ~CLOCAL;		/* -L=never */
+		break;
+	case CLOCAL_MODE_AUTO:			/* -L=auto */
+		break;
+	}
+
 #ifdef HAVE_STRUCT_TERMIOS_C_LINE
	tp->c_line = 0;
 #endif
@@ -1412,9 +1452,10 @@ static char *get_logname(struct options

			if (read(STDIN_FILENO, &c, 1) < 1) {

-				/* Do not report trivial like EINTR/EIO errors. */
+				/* The terminal could be open with O_NONBLOCK when
+				 * -L (force CLOCAL) is specified...  */
				if (errno == EINTR || errno == EAGAIN) {
-					usleep(1000);
+					usleep(250000);
					continue;
				}
				switch (errno) {
@@ -1648,7 +1689,7 @@ static void __attribute__ ((__noreturn__
	fputs(_(" -i, --noissue              do not display issue file\n"), out);
	fputs(_(" -I, --init-string <string> set init string\n"), out);
	fputs(_(" -l, --login-program <file> specify login program\n"), out);
-	fputs(_(" -L, --local-line           force local line\n"), out);
+	fputs(_(" -L, --local-line[=<mode>]  cotrol local line flag\n"), out);
	fputs(_(" -m, --extract-baud         extract baud rate during connect\n"), out);
	fputs(_(" -n, --skip-login           do not prompt for login\n"), out);
	fputs(_(" -o, --login-options <opts> options that are passed to login\n"), out);