diff options
Diffstat (limited to 'man/udev.7')
| -rw-r--r-- | man/udev.7 | 41 |
1 files changed, 39 insertions, 2 deletions
diff --git a/man/udev.7 b/man/udev.7 index 7aec25193a..b54683dcd0 100644 --- a/man/udev.7 +++ b/man/udev.7 @@ -2,7 +2,7 @@ .\" Title: udev .\" Author: Greg Kroah-Hartmann <greg@kroah.com> .\" Generator: DocBook XSL Stylesheets v1.78.0 <http://docbook.sf.net/> -.\" Date: 11/07/2014 +.\" Date: 05/30/2015 .\" Manual: udev .\" Source: udev .\" Language: English @@ -131,9 +131,10 @@ Match the subsystem of the event device\&. Match the driver name of the event device\&. Only set this key for devices which are bound to a driver at the time the event is generated\&. .RE .PP -\fIATTR{\fR\fI\fIfilename\fR\fR\fI}\fR +\fIATTR{\fR\fI\fIfilename\fR\fR\fI}\fR, \fISYSCTL{\fR\fI\fIkernel parameter\fR\fR\fI}\fR .RS 4 Match sysfs attribute values of the event device\&. Trailing whitespace in the attribute values is ignored unless the specified match value itself contains trailing whitespace\&. +Match a kernel parameter value\&. .RE .PP \fIKERNELS\fR @@ -274,6 +275,11 @@ Applies the specified Linux Security Module label to the device node\&. The value that should be written to a sysfs attribute of the event device\&. .RE .PP +\fISYSCTL{\fR\fI\fIkernel parameter\fR\fR\fI}\fR +.RS 4 +The value that should be written to kernel parameter\&. +.RE +.PP \fIENV{\fR\fI\fIkey\fR\fR\fI}\fR .RS 4 Set a device property value\&. Property names with a leading @@ -566,6 +572,37 @@ The content of all hwdb files is read by \fBudevadm\fR(8) and compiled to a binary database located at /etc/udev/hwdb\&.bin\&. During runtime only the binary database is used\&. +.SH "HARDWARE DATABASE FILES" +.PP +The hwdb files are read from the files located in the system hwdb directory +/usr/lib/udev/hwdb\&.d, the volatile runtime directory +/run/udev/hwdb\&.d +and the local administration directory +/etc/udev/hwdb\&.d\&. All hwdb files are collectively sorted and processed in lexical order, regardless of the directories in which they live\&. However, files with identical filenames replace each other\&. Files in +/etc +have the highest priority, files in +/run +take precedence over files with the same name in +/usr/lib\&. This can be used to override a system\-supplied hwdb file with a local file if needed; a symlink in +/etc +with the same name as a hwdb file in +/usr/lib, pointing to +/dev/null, disables the hwdb file entirely\&. hwdb files must have the extension +\&.hwdb; other extensions are ignored\&. +.PP +The hwdb file contains data records consisting of matches and associated key\-value pairs\&. Every record in the hwdb starts with one or more match string, specifying a shell glob to compare the database lookup string against\&. Multiple match lines are specified in additional consecutive lines\&. Every match line is compared indivdually, they are combined by OR\&. Every match line must start at the first character of the line\&. +.PP +The match lines are followed by one or more key\-value pair lines, which are recognized by a leading space character\&. The key name and value are separated by +=\&. An empty line signifies the end of a record\&. Lines beginning with +# +are ignored\&. +.PP +The content of all hwdb files is read by +\fBudevadm\fR(8) +and compiled to a binary database located at +/etc/udev/hwdb\&.bin, or alternatively +/usr/lib/udev/hwdb\&.bin +if you want ship the compiled database in an immutable image\&. During runtime only the binary database is used\&. .SH "SEE ALSO" .PP |