init: add a swapoff built-in command
Enables a method for swapping off certain block devices or files. This
will be used before hibernation occurs.
Bug: 339688542
Test: Manual, verified that calling swapoff from a init file swapsoff
location that is specified
Change-Id: I212a6f303a023c3e440b557caae82ad3904ac9c9
diff --git a/init/builtins.cpp b/init/builtins.cpp
index 606ea8c..f743a30 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -36,6 +36,7 @@
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
+#include <sys/swap.h>
#include <sys/syscall.h>
#include <sys/system_properties.h>
#include <sys/time.h>
@@ -1316,6 +1317,13 @@
return {};
}
+static Result<void> do_swapoff(const BuiltinArguments& args) {
+ if (!swapoff(args[1].c_str())) {
+ return ErrnoError() << "swapoff() failed";
+ }
+ return {};
+}
+
// Builtin-function-map start
const BuiltinFunctionMap& GetBuiltinFunctionMap() {
constexpr std::size_t kMax = std::numeric_limits<std::size_t>::max();
@@ -1372,6 +1380,7 @@
{"start", {1, 1, {false, do_start}}},
{"stop", {1, 1, {false, do_stop}}},
{"swapon_all", {0, 1, {false, do_swapon_all}}},
+ {"swapoff", {1, 1, {false, do_swapoff}}},
{"enter_default_mount_ns", {0, 0, {false, do_enter_default_mount_ns}}},
{"symlink", {2, 2, {true, do_symlink}}},
{"sysclktz", {1, 1, {false, do_sysclktz}}},