| 1 | '\" t
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| 2 | .TH "SYSTEMD\-UDEVD\&.SERVICE" "8" "" "systemd 202" "udevd"
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| 3 | .\" -----------------------------------------------------------------
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| 4 | .\" * Define some portability stuff
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| 5 | .\" -----------------------------------------------------------------
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| 6 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 7 | .\" http://bugs.debian.org/507673
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| 8 | .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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| 9 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 10 | .ie \n(.g .ds Aq \(aq
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| 11 | .el .ds Aq '
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| 12 | .\" -----------------------------------------------------------------
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| 13 | .\" * set default formatting
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| 14 | .\" -----------------------------------------------------------------
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| 15 | .\" disable hyphenation
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| 16 | .nh
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| 17 | .\" disable justification (adjust text to left margin only)
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| 18 | .ad l
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| 19 | .\" -----------------------------------------------------------------
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| 20 | .\" * MAIN CONTENT STARTS HERE *
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| 21 | .\" -----------------------------------------------------------------
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| 22 | .SH "NAME"
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| 23 | udevd \- Device event managing daemon
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| 24 | .SH "SYNOPSIS"
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| 25 | .HP \w'\fB/usr/lib/udevd\fR\ 'u
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| 26 | \fB/lib/udev/udevd\fR [\fB\-\-daemon\fR] [\fB\-\-debug\fR] [\fB\-\-children\-max=\fR] [\fB\-\-exec\-delay=\fR] [\fB\-\-resolve\-names=early|late|never\fR] [\fB\-\-version\fR] [\fB\-\-help\fR]
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| 27 | .SH "DESCRIPTION"
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| 28 | .PP
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| 29 | \fBudevd\fR
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| 30 | listens to kernel uevents\&. For every event, udevd executes matching instructions specified in udev rules\&. See
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| 31 | \fBudev\fR(7)\&.
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| 32 | .PP
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| 33 | The behavior of the running daemon can be changed with
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| 34 | \fBudevadm control\fR\&.
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| 35 | .SH "OPTIONS"
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| 36 | .PP
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| 37 | \fB\-\-daemon\fR
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| 38 | .RS 4
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| 39 | Detach and run in the background\&.
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| 40 | .RE
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| 41 | .PP
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| 42 | \fB\-\-debug\fR
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| 43 | .RS 4
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| 44 | Print debug messages to stderr\&.
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| 45 | .RE
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| 46 | .PP
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| 47 | \fB\-\-children\-max=\fR
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| 48 | .RS 4
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| 49 | Limit the number of events executed in parallel\&.
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| 50 | .RE
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| 51 | .PP
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| 52 | \fB\-\-exec\-delay=\fR
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| 53 | .RS 4
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| 54 | Delay the execution of RUN instruction by the given number of seconds\&. This option might be useful when debugging system crashes during coldplug caused by loading non\-working kernel modules\&.
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| 55 | .RE
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| 56 | .PP
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| 57 | \fB\-\-resolve\-names=\fR
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| 58 | .RS 4
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| 59 | Specify when udevd should resolve names of users and groups\&. When set to
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| 60 | \fBearly\fR
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| 61 | (the default) names will be resolved when the rules are parsed\&. When set to
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| 62 | \fBlate\fR
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| 63 | names will be resolved for every event\&. When set to
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| 64 | \fBnever\fR
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| 65 | names will never be resolved and all devices will be owned by root\&.
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| 66 | .RE
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| 67 | .PP
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| 68 | \fB\-\-version\fR
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| 69 | .RS 4
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| 70 | Print version number\&.
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| 71 | .RE
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| 72 | .PP
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| 73 | \fB\-\-help\fR
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| 74 | .RS 4
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| 75 | Print help text\&.
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| 76 | .RE
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| 77 | .SH "ENVIRONMENT"
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| 78 | .PP
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| 79 | \fI$UDEV_LOG=\fR
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| 80 | .RS 4
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| 81 | Set the logging priority\&.
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| 82 | .RE
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| 83 | .SH "KERNEL COMMAND LINE"
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| 84 | .PP
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| 85 | Parameters starting with "rd\&." will be read when
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| 86 | \fBudevd\fR
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| 87 | is used in an initrd\&.
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| 88 | .PP
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| 89 | \fIudev\&.log\-priority=\fR, \fIrd\&.udev\&.log\-priority=\fR
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| 90 | .RS 4
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| 91 | Set the logging priority\&.
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| 92 | .RE
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| 93 | .PP
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| 94 | \fIudev\&.children\-max=\fR, \fIrd\&.udev\&.children\-max=\fR
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| 95 | .RS 4
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| 96 | Limit the number of events executed in parallel\&.
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| 97 | .RE
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| 98 | .PP
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| 99 | \fIudev\&.exec\-delay=\fR, \fIrd\&.udev\&.exec\-delay=\fR
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| 100 | .RS 4
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| 101 | Delay the execution of RUN instruction by the given number of seconds\&. This option might be useful when debugging system crashes during coldplug caused by loading non\-working kernel modules\&.
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| 102 | .RE
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| 103 | .PP
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| 104 | \fInet\&.ifnames=\fR
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| 105 | .RS 4
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| 106 | Network interfaces are renamed to give them predictable names when possible\&. It is enabled by default, specifying 0 disables it\&.
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| 107 | .RE
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| 108 | .SH "CONFIGURATION FILE"
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| 109 | .PP
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| 110 | udev expects its main configuration file at
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| 111 | /etc/udev/udev\&.conf\&. It consists of a set of variables allowing the user to override default udev values\&. All empty lines or lines beginning with \*(Aq#\*(Aq are ignored\&. The following variables can be set:
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| 112 | .PP
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| 113 | \fIudev_log\fR
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| 114 | .RS 4
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| 115 | The logging priority\&. Valid values are the numerical syslog priorities or their textual representations:
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| 116 | \fBerr\fR,
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| 117 | \fBinfo\fR
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| 118 | and
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| 119 | \fBdebug\fR\&.
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| 120 | .RE
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| 121 | .SH "SEE ALSO"
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| 122 | .PP
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| 123 | \fBudev\fR(7),
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| 124 | \fBudevadm\fR(8)
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