This extends the udev parser to support OP_REMOVE (-=) and adds support
for TAG-= to remove previously set tags. We don't fail if the tag didn't
exist.
This is pretty handy if we ship default rules for seat-assignments and
users want to exclude specific devices from that. They can easily add
rules that drop any automatically added "seat" tags again.
Under some conditions, in udev_rules_apply_to_event the fact that
result is 1024 bytes, creates problems if the output of the running
command/app is bigger then 1024 bytes.
GCC optimizes strlen("string constant") to a constant, even with -O0.
Thus, replace patterns like sizeof("string constant")-1 with
strlen("string constant") where possible, for clarity. In particular,
for expressions intended to add up the lengths of components going into
a string, this often makes it clearer that the expression counts the
trailing '\0' exactly once, by putting the +1 for the '\0' at the end of
the expression, rather than hidden in a sizeof in the middle of the
expression.
In trying to track down a stupid linker bug, I noticed a bunch of
memset() calls that should be using memzero() to make it more "obvious"
that the options are correct (i.e. 0 is not the length, but the data to
set). So fix up all current calls to memset(foo, 0, length) to
memzero(foo, length).
- Add space between if/for and the opening parentheses
- Place the opening brace on same line as the function (not for udev)
From the CODING_STYLE
Try to use this:
void foo() {
}
instead of this:
void foo()
{
}
src/udev/udev-rules.c: In function 'add_rule':
src/udev/udev-rules.c:1078:33: warning: format '%lu' expects argument of type 'long unsigned int', but argument 8 has type 'int' [-Wformat=]
log_error("invalid key/value pair in file %s on line %u,"
^
Based on a patch by Kay Sievers.
A tag is exported at boot as a symlinks to the device node in the folder
/run/udev/static_node-tags/<tagname>/, if the device node exists.
These tags are cleaned up by udevadm info --cleanup-db, but are otherwise
never removed.
On Wed, Aug 8, 2012 at 11:48 AM, Michael Schroeder <mls@suse.de> wrote:
> if rules are installed in the first 3 seconds after the udev start,
> the stamps will all be zero, so the [first] call to check_rules_timestamp()
> will just copy the current mtime [and not cause a rules re-load].