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Extend and document the "wait" command 

The wait command was currently implemented but
undocumented and only used internally. This change
adds a second option toi (optionally) override the default
timeout of 5 seconds.

The wait command can be used to wait for a file to appear
during the boot process, for example a disk or other device,
and is a better alternative than an unconditional sleep.

Change-Id: Ia11d8419c0ea84deec0e1bf5adfca5bc76ff38b7
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Patrick McCormick 2011-02-04 10:51:39 -08:00 committed by Andrew Boie
parent ec7d9dc713
commit 96d0a4dda8
2 changed files with 9 additions and 2 deletions
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6
init/builtins.c
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@ -813,6 +813,8 @@ int do_wait(int nargs, char **args)
{
if (nargs == 2) {
return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
}
return -1;
} else if (nargs == 3) {
return wait_for_file(args[1], atoi(args[2]));
} else
return -1;
}

5
init/readme.txt
View File

@ -207,6 +207,11 @@ trigger <event>
Trigger an event. Used to queue an action from another
action.
wait <path> [ <timeout> ]
Poll for the existence of the given file and return when found,
or the timeout has been reached. If timeout is not specified it
currently defaults to five seconds.
write <path> <string> [ <string> ]*
Open the file at <path> and write one or more strings
to it with write(2)