X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudev.xml;h=85214242065174445351688e3e36bc97a2837626;hp=225ad5ce3f099426bb6e225e62d07e88468ceffb;hb=2d74bc75792bdd993e6298cf253541624001517c;hpb=ac1ba8e487b12e15c12e64ac78023b9dfbc0a30e diff --git a/udev/udev.xml b/udev/udev.xml index 225ad5ce3..852142420 100644 --- a/udev/udev.xml +++ b/udev/udev.xml @@ -331,10 +331,10 @@ devices claim the same name, the link always points to the device with the highest link_priority. If the current device goes away, the links are re-evaluated and the device with the next highest link_priority becomes the owner of - the link. If no link_priority is specified, the order of the devices, and - which one of them owns the link, is undefined. Claiming the same name for - a symlink, which is or might be used for a device node, may result in - unexpected behavior and is not supported. + the link. If no link_priority is specified, the order of the devices (and + which one of them owns the link) is undefined. Also, symlink names must + never conflict with the kernel's default device node names, as that would + result in unpredictable behavior. @@ -359,7 +359,8 @@ Set a device property value. Property names with a leading '.' - are not stored in the database or exported to external tool or events. + are neither stored in the database nor exported to events or + external tools (run by, say, the PROGRAM match key). @@ -385,23 +386,25 @@ this or a dependent device. Long running tasks need to be immediately detached from the event process itself. If no absolute path is given, the program is expected to live in - /lib/udev, otherwise the absolute path must be - specified. Program name and arguments are separated by spaces. Single quotes - can be used to specify arguments with spaces. + the directory provided at compile-time to configure via --libexecdir + (this is usually /lib/udev), otherwise the absolute + path must be specified. The program name and following arguments are + separated by spaces. Single quotes can be used to specify arguments with + spaces. - Named label where a GOTO can jump to. + A named label to which a GOTO may jump. - Jumps to the next LABEL with a matching name + Jumps to the next LABEL with a matching name. @@ -423,8 +426,8 @@ - Import a text file specified as the assigned value, which must be in - environment key format. + Import a text file specified as the assigned value, the content + of which must be in environment key format. @@ -438,7 +441,7 @@ - Import a single property from the kernel commandline. For simple flags + Import a single property from the kernel command line. For simple flags the value of the property is set to '1'. @@ -462,9 +465,9 @@ - Wait for a file to become available or until a 10 - seconds timeout expires. The path is relative to the sysfs device, - i. e. if no path is specified this waits for an attribute to appear. + Wait for a file to become available or until a timeout of + 10 seconds expires. The path is relative to the sysfs device; + if no path is specified, this waits for an attribute to appear. @@ -498,7 +501,7 @@ - Apply the permissions specified in this rule to a static device node with + Apply the permissions specified in this rule to the static device node with the specified name. Static device nodes might be provided by kernel modules or copied from /lib/udev/devices. These nodes might not have a corresponding kernel device at the time udevd is started; they can trigger @@ -525,10 +528,10 @@ The , , , , , and - fields support simple printf-like string substitutions. The - format chars gets applied after all rules have been processed, right before the program - is executed. It allows the use of device properties set by earlier matching - rules. For all other fields, substitutions are applied while the individual rule is + fields support simple string substitutions. The + 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: @@ -577,9 +580,9 @@ 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, use the attribute from that - parent device. - If the attribute is a symlink, the last element of the symlink target is + 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. @@ -609,9 +612,9 @@ , The string returned by the external program requested with PROGRAM. - A single part of the string, separated by a space character may be selected + A single part of the string, separated by a space character, may be selected by specifying the part number as an attribute: . - If the number is followed by the '+' char this part plus all remaining parts + If the number is followed by the '+' character, this part plus all remaining parts of the result string are substituted: @@ -634,8 +637,8 @@ - The current list of symlinks, separated by a space character. The value is - only set if an earlier rule assigned a value, or during a remove events. + A space-separated list of the current symlinks. The value is + only set during a remove event or if an earlier rule assigned a value.