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From 7974045302fe53629e70501f0180f30cbaa25b1e Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Wed, 6 Jun 2018 15:57:24 +0200
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Subject: [PATCH 162/173] agetty: keep c_iflags unmodified on --autologin
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agetty sets c_iflags according to interaction with serial line in
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get_logname(). For --autologin it does not read from the line, so we
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have no clue how to set the flags.
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The current behavior is to zeroize the flags. Unfortunately, it seems
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like bad idea, because the line may be already properly initialized by
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kernel (or systemd, etc.).
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The new behavior is not touch the flags on --autologin.
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Upstream: http://github.com/karelzak/util-linux/commit/2c4d86abdadab19be76abecb156da7f7dc284d81
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1252764
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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term-utils/agetty.8 | 4 ++++
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term-utils/agetty.c | 17 +++++++++++++----
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2 files changed, 17 insertions(+), 4 deletions(-)
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diff --git a/term-utils/agetty.8 b/term-utils/agetty.8
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index a42cdf158..fe4bfd427 100644
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--- a/term-utils/agetty.8
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+++ b/term-utils/agetty.8
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@@ -94,6 +94,10 @@ password. The \-f \fIusername\fP option is added to the \fB/bin/login\fP
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command line by default. The \-\-login-options option changes this default
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behaviour and then only \\u is replaced by the \fIusername\fP and no other
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option is added to the login command line.
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+
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+Note that \fB\-\-autologin\fP may affect the way how agetty initializes the
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+serial line, because on auto-login agetty does not read from the line and it
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+has no opportunity optimize the line setting.
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.TP
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\-c, \-\-noreset
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Don't reset terminal cflags (control modes). See \fItermios(3)\fP for more
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diff --git a/term-utils/agetty.c b/term-utils/agetty.c
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index b626cdbeb..948d77246 100644
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--- a/term-utils/agetty.c
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+++ b/term-utils/agetty.c
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@@ -1100,13 +1100,22 @@ static void termio_init(struct options *op, struct termios *tp)
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/* Flush input and output queues, important for modems! */
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tcflush(STDIN_FILENO, TCIOFLUSH);
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+ /* The defaul is set c_iflag in termio_final() according to chardata.
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+ * Unfortunately, the chardata are not set according to the serial line
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+ * if --autolog is enabled. In this case we do not read from the line
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+ * at all. The best what we can do in this case is to keep c_iflag
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+ * unmodified for --autolog.
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+ */
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+ if (!op->autolog) {
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#ifdef IUTF8
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- tp->c_iflag = tp->c_iflag & IUTF8;
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- if (tp->c_iflag & IUTF8)
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- op->flags |= F_UTF8;
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+ tp->c_iflag = tp->c_iflag & IUTF8;
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+ if (tp->c_iflag & IUTF8)
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+ op->flags |= F_UTF8;
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#else
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- tp->c_iflag = 0;
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+ tp->c_iflag = 0;
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#endif
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+ }
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+
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tp->c_lflag = 0;
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tp->c_oflag &= OPOST | ONLCR;
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--
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2.14.4
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