X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fudev.xml;h=eab5d25f0a556a21c8c69e9f59e4d80b3ecb33a0;hp=38acdf7446a0cf095c3d35f248d211cf686e4526;hb=b67f562c9cac44bd78b24f5aae78a1797c5d4182;hpb=c26547d612733371494330e26c7d3604a5dba3d9 diff --git a/man/udev.xml b/man/udev.xml index 38acdf744..eab5d25f0 100644 --- a/man/udev.xml +++ b/man/udev.xml @@ -63,10 +63,10 @@ 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 /lib. This can be + over files with the same name in /usr/lib. This can be used to override a system-supplied rules file with a local file if needed; a symlink in /etc with the same name as a rules file in - /lib, pointing to /dev/null, + /usr/lib, pointing to /dev/null, disables the rules file entirely. Rule files must have the extension .rules; other extensions are ignored. @@ -255,9 +255,9 @@ Execute a program to determine whether there is a match; the key is true if the program returns successfully. The device properties are made available to the - executed program in the environment. The program's stdout - is available in the RESULT key. - This can only be used for very short-running foreground tasks. For details + executed program in the environment. The program's standard ouput + is available in the RESULT key. + This can only be used for very short-running foreground tasks. For details, see RUN. @@ -265,8 +265,9 @@ RESULT - Match the returned string of the last PROGRAM call. This key can - be used in the same or in any later rule after a PROGRAM call. + Match the returned string of the last PROGRAM call. + This key can be used in the same or in any later rule after a + PROGRAM call. @@ -293,9 +294,10 @@ example, the pattern string tty[SR] would match either ttyS or ttyR. Ranges are also supported via the - character. - For example, to match on the range of all digits, the pattern [0-9] could - be used. If the first character following the [ is a - !, any characters not enclosed are matched. + For example, to match on the range of all digits, the pattern + [0-9] could be used. If the first character + following the [ is a !, + any characters not enclosed are matched. @@ -360,7 +362,8 @@ Set a device property value. Property names with a leading . are neither stored in the database nor exported to events or - external tools (run by, say, the PROGRAM match key). + external tools (run by, for example, the PROGRAM + match key). @@ -380,24 +383,26 @@ RUN{type} - Add a program to the list of programs to be executed after processing all the - rules for a specific event, depending on type: + Add a program to the list of programs to be executed after + processing all the rules for a specific event, depending on + type: program Execute an external program specified as the assigned - value. If no absolute path is given, the program is expected to live in - /usr/lib/udev, otherwise the absolute path must be specified. - This is the default if no type is - specified. + value. If no absolute path is given, the program is expected + to live in /usr/lib/udev; otherwise, the + absolute path must be specified. + This is the default if no type + is specified. builtin - As program, but use one of the built-in programs rather - than an external one. + As program, but use one of the + built-in programs rather than an external one. @@ -406,7 +411,7 @@ This can only be used for very short-running foreground tasks. Running an event process for a long period of time may block all further events for this or a dependent device. - Starting daemons or other long running processes is not appropriate + Starting daemons or other long-running processes is not appropriate for udev; the forked processes, detached or not, will be unconditionally killed after the event handling has finished. @@ -415,14 +420,14 @@ LABEL - A named label to which a GOTO may jump. + A named label to which a GOTO may jump. GOTO - Jumps to the next LABEL with a matching name. + Jumps to the next LABEL with a matching name. @@ -525,21 +530,24 @@ - Apply the permissions specified in this rule to the static device node with - the specified name. Also, for every tag specified in this rule, create a symlink + Apply the permissions specified in this rule to the + static device node with the specified name. Also, for every + tag specified in this rule, create a symlink in the directory /run/udev/static_node-tags/tag - pointing at the static device node with the specified name. Static device node - creation is performed by systemd-tmpfiles before systemd-udevd is started. The - static nodes might not have a corresponding kernel device; they are used to - trigger automatic kernel module loading when they are accessed. + pointing at the static device node with the specified name. + Static device node creation is performed by systemd-tmpfiles + before systemd-udevd is started. The static nodes might not + have a corresponding kernel device; they are used to trigger + automatic kernel module loading when they are accessed. - Watch the device node with inotify; when the node is closed after being opened for - writing, a change uevent is synthesized. + Watch the device node with inotify; when the node is + closed after being opened for writing, a change uevent is + synthesized. @@ -553,13 +561,15 @@ - The NAME, SYMLINK, PROGRAM, - OWNER, GROUP, MODE and RUN - fields support simple string substitutions. The RUN - substitutions are performed after all rules have been processed, right before the program - is executed, allowing for the use of device properties set by earlier matching - rules. For all other fields, substitutions are performed while the individual rule is - being processed. The available substitutions are: + The NAME, SYMLINK, + PROGRAM, OWNER, + GROUP, MODE, and + RUN fields support simple string substitutions. + The RUN substitutions are performed after all rules + have been processed, right before the program is executed, allowing for + the use of device properties set by earlier matching rules. For all other + fields, substitutions are performed while the individual rule is being + processed. The available substitutions are: , @@ -572,7 +582,8 @@ , The kernel number for this device. For example, - sda3 has kernel number 3. + sda3 has kernel number 3. + @@ -586,8 +597,9 @@ , - The name of the device matched while searching the devpath upwards for - , , and . + The name of the device matched while searching the devpath + upwards for , , + , and . @@ -595,8 +607,10 @@ - The driver name of the device matched while searching the devpath upwards for - , , and . + The driver name of the device matched while searching the + devpath upwards for , + , , and + . @@ -605,12 +619,15 @@ , The value of a sysfs attribute found at the device where - all keys of the rule have matched. If the matching device does not have - such an attribute, and a previous KERNELS, SUBSYSTEMS, DRIVERS, or - ATTRS test selected a parent device, then the attribute from that - parent device is used. - If the attribute is a symlink, the last element of the symlink target is - returned as the value. + all keys of the rule have matched. If the matching device does not + have such an attribute, and a previous , + , , or + test selected a parent device, then the + attribute from that parent device is used. + + If the attribute is a symlink, the last element of the + symlink target is returned as the value. + @@ -638,7 +655,8 @@ , - The string returned by the external program requested with PROGRAM. + The string returned by the external program requested with + PROGRAM. A single part of the string, separated by a space character, may be selected by specifying the part number as an attribute: %c{N}. If the number is followed by the + character, this part plus all remaining parts @@ -715,10 +733,10 @@ 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 /lib. This can be + 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 - /lib, pointing to /dev/null, + /usr/lib, pointing to /dev/null, disables the hwdb file entirely. hwdb files must have the extension .hwdb; other extensions are ignored. @@ -741,13 +759,238 @@ During runtime only the binary database is used. + Network Link Configuration + Network link configuration is performed by the net_setup_link + udev builtin. + + The link files are read from the files located in the + system network directory /usr/lib/systemd/network, + the volatile runtime network directory /run/systemd/network + and the local administration network directory /etc/systemd/network. + Link files must have the extension .link; other extensions are ignored. + All link 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 link file with a local file if needed; + a symlink in /etc with the same name as a link file in + /usr/lib, pointing to /dev/null, + disables the link file entirely. + + The link file contains a [Match] section, which + determines if a given link file may be applied to a given device; and a + [Link] section specifying how the device should be + configured. The first (in lexical order) of the link files that matches + a given device is applied. + + A link file is said to match a device if each of the entries in the + [Match] section matches, or if the section is empty. + The following keys are accepted: + + + + MACAddress + + The hardware address. + + + + + Path + + The persistent path, as exposed by the udev property ID_PATH. + + + + Driver + + The driver currently bound to the device, as exposed by the + udev property DRIVER of its parent device. + + + + Type + + The device type, as exposed by the udev property DEVTYPE. + + + + + The [Link] section accepts the following keys: + + + + Description + + A description of the device. + + + + Alias + + The ifalias is set to this value. + + + + MACAddressPolicy + + The policy by which the MAC address should be set. The + available policies are: + + + + persistent + + If the hardware has a persistent MAC address, as most + hardware should, and this is used by the kernel, nothing is + done. Otherwise, a new MAC address is generated which is + guaranteed to be the same on every boot for the given + machine and the given device, but which is otherwise random. + + + + + random + + If the kernel is using a random MAC address, nothing is + done. Otherwise, a new address is randomly generated each + time the device appears, typically at boot. + + + + + + + + MACAddress + + The MAC address to use, if no MACAddressPolicy + is specified. + + + + + NamePolicy + + An ordered, space-separated list of policies by which the + interface name should be set. NamePolicy may + be disabled by specifying net.ifnames=0 on the + kernel commandline. Each of the policies may fail, and the first + successful one is used. The name is not set directly, but + is exported to udev as the property ID_NET_NAME, + which is, by default, used by a udev rule to set + NAME. The available policies are: + + + + onboard + + The name is set based on information given by the + firmware for on-board devices, as exported by the udev + property ID_NET_NAME_ONBOARD. + + + + + slot + + The name is set based on information given by the + firmware for hot-plug devices, as exported by the udev + property ID_NET_NAME_SLOT. + + + + + path + + The name is set based on the device's physical location, + as exported by the udev property + ID_NET_NAME_PATH. + + + + + mac + + The name is set based on the device's persistent MAC + address, as exported by the udev property + ID_NET_NAME_MAC. + + + + + + + + Name + + The interface name to use in case all the policies specified + in NamePolicy fail, or in case + NamePolicy is missing or disabled. + + + + + MTU + + The MTU to set for the device. + + + + SpeedMBytes + + The speed to set for the device. + + + + Duplex + + The duplex mode to set for the device. The accepted values + are half and full. + + + + + WakeOnLan + + The Wake-on-LAN policy to set for the device. The supported + values are: + + + + phy + + Wake on PHY activity. + + + + magic + + Wake on receipt of a magic packet. + + + + off + + Never wake. + + + + + + + + See Also - + + systemd-udevd.service8 , udevadm8 - + +