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init: add exec_background command

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This command functions similarly to `exec` except that it does not
cause init to halt executing commands until the process has
terminated.  It is useful for launching simple one time background
tasks.

Bug: 65736247
Test: create an exec_background service and see it function properly
Change-Id: I719c8b85479b65201770aedc0a13191303007c11
This commit is contained in:
Tom Cherry 2017-09-18 12:16:27 -07:00
parent 1973110355
commit 3631c545b8
2 changed files with 19 additions and 0 deletions
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5
init/README.md
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@ -381,6 +381,11 @@ Commands
within _argument_.
Init halts executing commands until the forked process exits.
`exec_background [ <seclabel> [ <user> [ <group>\* ] ] ] -- <command> [ <argument>\* ]`
> Fork and execute command with the given arguments. This is handled similarly
to the `exec` command. The difference is that init does not halt executing
commands until the process exits for `exec_background`.
`exec_start <service>`
> Start a given service and halt the processing of additional init commands
until it returns. The command functions similarly to the `exec` command,

14
init/builtins.cpp
View file

@ -148,6 +148,19 @@ static Result<Success> do_exec(const std::vector<std::string>& args) {
return Success();
}
static Result<Success> do_exec_background(const std::vector<std::string>& args) {
auto service = Service::MakeTemporaryOneshotService(args);
if (!service) {
return Error() << "Could not create exec background service";
}
if (auto result = service->Start(); !result) {
return Error() << "Could not start exec background service: " << result.error();
}
ServiceList::GetInstance().AddService(std::move(service));
return Success();
}
static Result<Success> do_exec_start(const std::vector<std::string>& args) {
Service* service = ServiceList::GetInstance().FindService(args[1]);
if (!service) {
@ -959,6 +972,7 @@ const BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const {
{"domainname", {1, 1, do_domainname}},
{"enable", {1, 1, do_enable}},
{"exec", {1, kMax, do_exec}},
{"exec_background", {1, kMax, do_exec_background}},
{"exec_start", {1, 1, do_exec_start}},
{"export", {2, 2, do_export}},
{"hostname", {1, 1, do_hostname}},