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From c5e4b6b9b2a1dea35f58f3e1c3313bca76a90162 Mon Sep 17 00:00:00 2001
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From: Ray Strode <rstrode@redhat.com>
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Date: Wed, 30 Nov 2022 14:07:29 -0500
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Subject: [PATCH] terminal-util: Set OPOST when setting ONLCR
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reset_terminal_fd sets certain minimum required terminal attributes
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that systemd relies on.
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One of those attributes is `ONLCR` which ensures that when a new line
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is sent to the terminal, that the cursor not only moves to the next
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line, but also moves to the very beginning of that line.
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In order for `ONLCR` to work, the terminal needs to perform output
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post-processing. That requires an additional attribute, `OPOST`,
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which reset_terminal_fd currently fails to ensure is set.
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In most cases `OPOST` (and `ONLCR` actually) are both set anyway, so
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it's not an issue, but it could be a problem if, e.g., the terminal was
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put in raw mode by a program and the program unexpectedly died before
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restoring settings.
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This commit ensures when `ONLCR` is set `OPOST` is set too, which is
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the only thing that really makes sense to do.
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(cherry picked from commit 9fe26523a189435d75b9d745188e09c17928d89e)
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Related: #2138081
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---
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src/basic/terminal-util.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
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index 0c092597eb..a75234f354 100644
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--- a/src/basic/terminal-util.c
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+++ b/src/basic/terminal-util.c
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@@ -269,7 +269,7 @@ int reset_terminal_fd(int fd, bool switch_to_text) {
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termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
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termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
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- termios.c_oflag |= ONLCR;
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+ termios.c_oflag |= ONLCR | OPOST;
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termios.c_cflag |= CREAD;
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termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
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