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Kernel+LibC: Implement sigtimedwait()

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This includes a new Thread::Blocker called SignalBlocker which blocks
until a signal of a matching type is pending. The current Blocker
implementation in the Kernel is very complicated, but cleaning it up is
a different yak for a different day.
This commit is contained in:
Idan Horowitz 2021-12-12 01:01:42 +02:00
parent 13d98999b7
commit 762e047ec9
8 changed files with 120 additions and 0 deletions
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31
Kernel/Syscalls/sigaction.cpp
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@ -307,4 +307,35 @@ ErrorOr<FlatPtr> Process::sys$sigaltstack(Userspace<const stack_t*> ss, Userspac
return 0;
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigtimedwait.html
ErrorOr<FlatPtr> Process::sys$sigtimedwait(Userspace<const sigset_t*> set, Userspace<siginfo_t*> info, Userspace<const timespec*> timeout)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
REQUIRE_PROMISE(sigaction);
sigset_t set_value;
TRY(copy_from_user(&set_value, set));
Thread::BlockTimeout block_timeout = {};
if (timeout) {
auto timeout_time = TRY(copy_time_from_user(timeout));
block_timeout = Thread::BlockTimeout(false, &timeout_time);
}
siginfo_t info_value = {};
auto block_result = Thread::current()->block<Thread::SignalBlocker>(block_timeout, set_value, info_value);
if (block_result.was_interrupted())
return EINTR;
// We check for an unset signal instead of directly checking for a timeout interruption
// in order to allow polling the pending signals by setting the timeout to 0.
if (info_value.si_signo == SIGINVAL) {
VERIFY(block_result == Thread::BlockResult::InterruptedByTimeout);
return EAGAIN;
}
if (info)
TRY(copy_to_user(info, &info_value));
return info_value.si_signo;
}
}