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util-linux/util-linux-agetty-s-option.patch

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git diff v2.18..HEAD login-utils/agetty.c login-utils/agetty.8
agetty: fix -s option (baud rate setup)
agetty: add -c to reuse cflags
agetty: add -s to reuse existing baud rate
diff --git a/login-utils/agetty.8 b/login-utils/agetty.8
index 8761374..084086f 100644
--- a/login-utils/agetty.8
+++ b/login-utils/agetty.8
@@ -3,7 +3,7 @@
agetty \- alternative Linux getty
.SH SYNOPSIS
-.BR "agetty " [\-8ihLmnUw]
+.BR "agetty " [\-c8ihLmnsUw]
.RI "[-f " issue_file ]
.RI "[-l " login_program ]
.RI "[-I " init ]
@@ -12,16 +12,6 @@ agetty \- alternative Linux getty
.I port
.I baud_rate,...
.RI [ term ]
-.br
-.BR "agetty " [\-8ihLmnw]
-.RI "[-f " issue_file ]
-.RI "[-l " login_program ]
-.RI "[-I " init ]
-.RI "[-t " timeout ]
-.RI "[-H " login_host ]
-.I baud_rate,...
-.I port
-.RI [ term ]
.SH DESCRIPTION
.ad
@@ -92,6 +82,10 @@ whatever init(8) may have set, and is inherited by login and the shell.
.fi
.ad
.TP
+\-c
+Don't reset terminal cflags (control modes). See \fItermios(3)\fP for more
+details.
+.TP
\-8
Assume that the tty is 8-bit clean, hence disable parity detection.
.TP
@@ -163,6 +157,10 @@ Force the line to be a local line with no need for carrier detect. This can
be useful when you have a locally attached terminal where the serial line
does not set the carrier detect signal.
.TP
+\-s
+Try to keep the existing baud rate. The baud rates from
+the command line are used when agetty receives a BREAK character.
+.TP
\-U
Turn on support for detecting an uppercase only terminal. This setting will
detect a login name containing only capitals as indicating an uppercase
diff --git a/login-utils/agetty.c b/login-utils/agetty.c
index 39a1fd3..9d463ce 100644
--- a/login-utils/agetty.c
+++ b/login-utils/agetty.c
@@ -133,6 +133,8 @@ struct options {
#define F_CUSTISSUE (1<<6) /* give alternative issue file */
#define F_NOPROMPT (1<<7) /* don't ask for login name! */
#define F_LCUC (1<<8) /* Support for *LCUC stty modes */
+#define F_KEEPSPEED (1<<9) /* Follow baud rate from kernel */
+#define F_KEEPCFLAGS (1<<10) /* Reuse c_cflags setup from kernel */
/* Storage for things detected while the login name was read. */
@@ -203,7 +205,7 @@ void parse_args P_((int argc, char **argv, struct options *op));
void parse_speeds P_((struct options *op, char *arg));
void update_utmp P_((char *line));
void open_tty P_((char *tty, struct termios *tp, int local));
-void termio_init P_((struct termios *tp, int speed, struct options *op));
+void termio_init P_((struct termios *tp, struct options *op));
void auto_baud P_((struct termios *tp));
void do_prompt P_((struct options *op, struct termios *tp));
void next_speed P_((struct termios *tp, struct options *op));
@@ -297,7 +299,7 @@ main(argc, argv)
tcsetpgrp(0, getpid());
/* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
debug("calling termio_init\n");
- termio_init(&termios, options.speeds[FIRST_SPEED], &options);
+ termio_init(&termios, &options);
/* write the modem init string and DON'T flush the buffers */
if (options.flags & F_INITSTRING) {
@@ -373,8 +375,11 @@ parse_args(argc, argv, op)
extern int optind; /* getopt */
int c;
- while (isascii(c = getopt(argc, argv, "8I:LH:f:hil:mt:wUn"))) {
+ while (isascii(c = getopt(argc, argv, "8cI:LH:f:hil:mst:wUn"))) {
switch (c) {
+ case 'c':
+ op->flags |= F_KEEPCFLAGS;
+ break;
case '8':
op->eightbits = 1;
break;
@@ -443,6 +448,9 @@ parse_args(argc, argv, op)
case 'n':
op->flags |= F_NOPROMPT;
break;
+ case 's':
+ op->flags |= F_KEEPSPEED; /* keep kernel defined speed */
+ break;
case 't': /* time out */
if ((op->timeout = atoi(optarg)) <= 0)
error(_("bad timeout value: %s"), optarg);
@@ -691,11 +699,17 @@ char gbuf[1024];
char area[1024];
void
-termio_init(tp, speed, op)
+termio_init(tp, op)
struct termios *tp;
- int speed;
struct options *op;
{
+ speed_t ispeed, ospeed;
+
+ if (op->flags & F_KEEPSPEED) {
+ ispeed = cfgetispeed(tp); /* save the original setting */
+ ospeed = cfgetospeed(tp);
+ } else
+ ospeed = ispeed = op->speeds[FIRST_SPEED];
/*
* Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
@@ -706,14 +720,21 @@ termio_init(tp, speed, op)
/* flush input and output queues, important for modems! */
(void) tcflush(0, TCIOFLUSH);
- tp->c_cflag = CS8 | HUPCL | CREAD;
- cfsetispeed(tp, speed);
- cfsetospeed(tp, speed);
+ tp->c_iflag = tp->c_lflag = tp->c_oflag = 0;
+
+ if (!(op->flags & F_KEEPCFLAGS))
+ tp->c_cflag = CS8 | HUPCL | CREAD | (tp->c_cflag & CLOCAL);
+
+ /* Note that the speed is stored in the c_cflag termios field, so we have
+ * set the speed always when the cflag se reseted.
+ */
+ cfsetispeed(tp, ispeed);
+ cfsetospeed(tp, ospeed);
+
if (op->flags & F_LOCAL) {
tp->c_cflag |= CLOCAL;
}
- tp->c_iflag = tp->c_lflag = tp->c_oflag = 0;
#ifdef HAVE_STRUCT_TERMIOS_C_LINE
tp->c_line = 0;
#endif
@@ -973,9 +994,18 @@ next_speed(tp, op)
struct termios *tp;
struct options *op;
{
- static int baud_index = FIRST_SPEED;/* current speed index */
+ static int baud_index = -1;
+
+ if (baud_index == -1)
+ /*
+ * if the F_KEEPSPEED flags is set then the FIRST_SPEED is not
+ * tested yet (see termio_init()).
+ */
+ baud_index = (op->flags & F_KEEPSPEED) ? FIRST_SPEED :
+ 1 % op->numspeed;
+ else
+ baud_index = (baud_index + 1) % op->numspeed;
- baud_index = (baud_index + 1) % op->numspeed;
cfsetispeed(tp, op->speeds[baud_index]);
cfsetospeed(tp, op->speeds[baud_index]);
(void) tcsetattr(0, TCSANOW, tp);
@@ -1203,7 +1233,7 @@ bcode(s)
void
usage()
{
- fprintf(stderr, _("Usage: %s [-8hiLmUw] [-l login_program] [-t timeout] [-I initstring] [-H login_host] baud_rate,... line [termtype]\nor\t[-hiLmw] [-l login_program] [-t timeout] [-I initstring] [-H login_host] line baud_rate,... [termtype]\n"), progname);
+ fprintf(stderr, _("Usage: %s [-8hiLmsUw] [-l login_program] [-t timeout] [-I initstring] [-H login_host] baud_rate,... line [termtype]\nor\t[-hiLmw] [-l login_program] [-t timeout] [-I initstring] [-H login_host] line baud_rate,... [termtype]\n"), progname);
exit(1);
}
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