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Document the formatting requirements of location and pnpinfo strings.

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devd requires location and pnpinfo strings generated by bus drivers
to be formatted as a list of name=value keypairs.  Non-conforming
bus drivers cause devd to mis-parse device events for these buses.

Note that this documents the desired requirements.  devctl_safe_quote()
doesn't yet escape backslash characters, and devd doesn't handle escaped
characters in quoted values.

Differential Revision:	https://reviews.freebsd.org/D6252
This commit is contained in:
John Baldwin 2016-05-17 19:34:07 +00:00
parent 0f85a96bbf
commit ed7ed7f0ca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=300073
1 changed files with 15 additions and 1 deletions
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16
sys/kern/bus_if.m
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@ -532,6 +532,13 @@ METHOD int child_present {
*
* Return it as a string. If the string is insufficient for the
* storage, then return EOVERFLOW.
*
* The string must be formatted as a space-separated list of
* name=value pairs. Names may only contain alphanumeric characters,
* underscores ('_') and hyphens ('-'). Values can contain any
* non-whitespace characters. Values containing whitespace can be
* quoted with double quotes ('"'). Double quotes and backslashes in
* quoted values can be escaped with backslashes ('\').
*
* @param _dev the parent device of @p _child
* @param _child the device which is being examined
@ -551,7 +558,14 @@ METHOD int child_pnpinfo_str {
*
* Return it as a string. If the string is insufficient for the
* storage, then return EOVERFLOW.
*
*
* The string must be formatted as a space-separated list of
* name=value pairs. Names may only contain alphanumeric characters,
* underscores ('_') and hyphens ('-'). Values can contain any
* non-whitespace characters. Values containing whitespace can be
* quoted with double quotes ('"'). Double quotes and backslashes in
* quoted values can be escaped with backslashes ('\').
*
* @param _dev the parent device of @p _child
* @param _child the device which is being examined
* @param _buf the address of a buffer to receive the location