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| author | Patrick McCormick <patrickX.m.mccormick@intel.com> | 2011-02-04 10:51:39 -0800 |
|---|---|---|
| committer | Andrew Boie <andrew.p.boie@intel.com> | 2012-07-24 10:31:49 -0700 |
| commit | 96d0a4dda81aaff3f72b9690d88eb40387ee9630 (patch) | |
| tree | 64311abfb0a6d94518d68a8b923ff0a0d1d08f9b | |
| parent | ec7d9dc713322bd41b1e348c0ea3b1304a13dba9 (diff) | |
| download | system_core-96d0a4dda81aaff3f72b9690d88eb40387ee9630.tar.gz system_core-96d0a4dda81aaff3f72b9690d88eb40387ee9630.tar.bz2 system_core-96d0a4dda81aaff3f72b9690d88eb40387ee9630.zip | |
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>
| -rw-r--r-- | init/builtins.c | 6 | ||||
| -rw-r--r-- | init/readme.txt | 5 |
2 files changed, 9 insertions, 2 deletions
diff --git a/init/builtins.c b/init/builtins.c index ac9585e8..6d3ed251 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 df524a6d..fe0d15d0 100644 --- a/init/readme.txt +++ b/init/readme.txt @@ -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) |