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Commit 43997540 authored by terryguan's avatar terryguan
Browse files

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
parent d96c6b8e

init/README.md

+3 −1
Original line number Diff line number Diff line
@@ -745,6 +745,9 @@ provides the `aidl_lazy_test_1` interface. 
  fstab.${ro.hardware} or fstab.${ro.hardware.platform} will be scanned for

  under /odm/etc, /vendor/etc, or / at runtime, in that order.



`swapoff <path>`

> Stops swapping to the file or block device specified by path.



`symlink <target> <path>`

> Create a symbolic link at _path_ with the value _target_
@@ -788,7 +791,6 @@ provides the `aidl_lazy_test_1` interface. 
  If the file does not exist, it will be created. If it does exist,

  it will be truncated. Properties are expanded within _content_.





Imports

-------

`import <path>`

init/builtins.cpp

+9 −0
Original line number Diff line number Diff line
@@ -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 @@ static Result<void> do_enter_default_mount_ns(const BuiltinArguments& args) { 
    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 @@ const BuiltinFunctionMap& GetBuiltinFunctionMap() { 
        {"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}}},