lfs-book-zh_CN/udev-lfs/udevd.8

.\"     Title: systemd-udevd.service
.\"    Author: Kay Sievers <kay@vrfy.org>
.\" Generator: DocBook XSL Stylesheets v1.77.1 <http://docbook.sf.net/>
.\"      Date: 07/20/2012
.\"    Manual: systemd-udevd.service
.\"    Source: systemd
.\"  Language: English
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.\" Manually updated for udev only for LFS by BRuce Dubbs
.\" <bdubbs@linuxfromscratch.org>
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.TH "UDEVD" "8" "" "systemd (LFS modified man page)" "udevd"
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.SH "NAME"
udevd \- Device event managing daemon
.SH "SYNOPSIS"
.PP
.HP \w'\fB/usr/lib/udevd\fR\ 'u
\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]
.SH "DESCRIPTION"
.PP
udevd listens to kernel uevents\&. For every event, udevd executes matching instructions specified in udev rules\&. See
\fBudev\fR(7)\&.
.PP
The behavior of the running daemon can be changed with
\fBudevadm control\fR\&.
.SH "OPTIONS"
.PP
\fB\-\-daemon\fR
.RS 4
Detach and run in the background\&.
.RE
.PP
\fB\-\-debug\fR
.RS 4
Print debug messages to stderr\&.
.RE
.PP
\fB\-\-children\-max=\fR
.RS 4
Limit the number of parallel executed events\&.
.RE
.PP
\fB\-\-exec\-delay=\fR
.RS 4
Number of seconds to delay the execution of RUN instructions\&. This might be useful when debugging system crashes during coldplug cause by loading non\-working kernel modules\&.
.RE
.PP
\fB\-\-resolve\-names=\fR
.RS 4
Specify when udevd should resolve names of users and groups\&. When set to
\fBearly\fR
(the default) names will be resolved when the rules are parsed\&. When set to
\fBlate\fR
names will be resolved for every event\&. When set to
\fBnever\fR
names will never be resolved and all devices will be owned by root\&.
.RE
.PP
\fB\-\-version\fR
.RS 4
Print version number\&.
.RE
.PP
\fB\-\-help\fR
.RS 4
Print help text\&.
.RE
.SH "ENVIRONMENT"
.PP
\fIUDEV_LOG=\fR
.RS 4
Set the logging priority\&.
.RE
.SH "KERNEL COMMAND LINE"
.PP
The parameters starting with "rd\&.", will be read when udev is used in an initrd\&.
.PP
\fIudev\&.log\-priority=\fR, \fIrd\&.udev\&.log\-priority=\fR
.RS 4
Set the logging priority\&.
.RE
.PP
\fIudev\&.children\-max=\fR, \fIrd\&.udev\&.children\-max=\fR
.RS 4
Limit the number of parallel executed events\&.
.RE
.PP
\fIudev\&.exec\-delay=\fR, \fIrd\&.udev\&.exec\-delay=\fR
.RS 4
Number of seconds to delay the execution of RUN instructions\&. This might be useful when debugging system crashes during coldplug cause by loading non\-working kernel modules\&.
.RE
.SH "SEE ALSO"
.PP
\fBudev\fR(7),
\fBudevadm\fR(8)