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For pluggable ttys such as USB serial devices, the getty is restarted and exits in a loop until the remove event reaches systemd. Under certain circumstances the restart loop can overload the system in a way that prevents the remove event from reaching systemd for a long time (e.g. at least several minutes on a small embedded system). Use the default RestartSec to prevent the restart loop from overloading the system. Serial gettys are interactive units, so waiting an extra 100ms really doesn't make a difference anyways compared to the time it takes the user to log in.
38 lines
1.0 KiB
Plaintext
38 lines
1.0 KiB
Plaintext
# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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[Unit]
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Description=Serial Getty on %I
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Documentation=man:agetty(8) man:systemd-getty-generator(8)
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Documentation=http://0pointer.de/blog/projects/serial-console.html
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BindsTo=dev-%i.device
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After=dev-%i.device systemd-user-sessions.service plymouth-quit-wait.service
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m4_ifdef(`HAVE_SYSV_COMPAT',
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After=rc-local.service
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)m4_dnl
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# If additional gettys are spawned during boot then we should make
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# sure that this is synchronized before getty.target, even though
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# getty.target didn't actually pull it in.
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Before=getty.target
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IgnoreOnIsolate=yes
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[Service]
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ExecStart=-/sbin/agetty --keep-baud 115200,38400,9600 %I $TERM
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Type=idle
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Restart=always
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UtmpIdentifier=%I
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TTYPath=/dev/%I
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TTYReset=yes
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TTYVHangup=yes
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KillMode=process
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IgnoreSIGPIPE=no
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SendSIGHUP=yes
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[Install]
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WantedBy=getty.target
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