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Kernel: Add getrusage() syscall

Only the two timeval fields are maintained, as required by the POSIX
standard.
This commit is contained in:
Lucas CHOLLET 2022-01-31 22:09:30 +01:00 committed by Andreas Kling
parent 39bfc48ea7
commit 839d3d9f74
5 changed files with 83 additions and 2 deletions

View file

@ -0,0 +1,37 @@
/*
* Copyright (c) 2022, Lucas Chollet <lucas.chollet@free.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Process.h>
namespace Kernel {
ErrorOr<FlatPtr> Process::sys$getrusage(int who, Userspace<rusage*> user_usage)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
rusage usage {};
auto const ticks_per_second = TimeManagement::the().ticks_per_second();
switch (who) {
case RUSAGE_SELF:
usage.ru_utime = Time::from_ticks(m_ticks_in_user, ticks_per_second).to_timeval();
usage.ru_stime = Time::from_ticks(m_ticks_in_kernel, ticks_per_second).to_timeval();
break;
case RUSAGE_CHILDREN:
usage.ru_utime = Time::from_ticks(m_ticks_in_user_for_dead_children, ticks_per_second).to_timeval();
usage.ru_stime = Time::from_ticks(m_ticks_in_kernel_for_dead_children, ticks_per_second).to_timeval();
break;
default:
return EINVAL;
}
TRY(copy_to_user(user_usage, &usage));
return 0;
}
}