From 96d0a4dda81aaff3f72b9690d88eb40387ee9630 Mon Sep 17 00:00:00 2001 From: Patrick McCormick Date: Fri, 4 Feb 2011 10:51:39 -0800 Subject: [PATCH] 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 --- init/builtins.c | 6 ++++-- init/readme.txt | 5 +++++ 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/init/builtins.c b/init/builtins.c index ac9585e83..6d3ed251a 100644 --- a/init/builtins.c +++ b/init/builtins.c @@ -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; } diff --git a/init/readme.txt b/init/readme.txt index df524a6df..fe0d15d09 100644 --- a/init/readme.txt +++ b/init/readme.txt @@ -207,6 +207,11 @@ trigger Trigger an event. Used to queue an action from another action. +wait [ ] + 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 [ ]* Open the file at and write one or more strings to it with write(2)