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Everywhere: Switch from (void) to [[maybe_unused]] (#4473)

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Problem:
- `(void)` simply casts the expression to void. This is understood to
  indicate that it is ignored, but this is really a compiler trick to
  get the compiler to not generate a warning.

Solution:
- Use the `[[maybe_unused]]` attribute to indicate the value is unused.

Note:
- Functions taking a `(void)` argument list have also been changed to
  `()` because this is not needed and shows up in the same grep
  command.
This commit is contained in:
Lenny Maiorani 2020-12-20 16:09:48 -07:00 • committed by GitHub
parent 4421d98e30
commit 765936ebae
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
103 changed files with 219 additions and 362 deletions
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8
Kernel/TTY/TTY.cpp
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@ -57,7 +57,7 @@ KResultOr<size_t> TTY::read(FileDescription&, size_t, UserOrKernelBuffer& buffer
{
if (Process::current()->pgid() != pgid()) {
// FIXME: Should we propagate this error path somehow?
(void)Process::current()->send_signal(SIGTTIN, nullptr);
[[maybe_unused]] auto rc = Process::current()->send_signal(SIGTTIN, nullptr);
return KResult(-EINTR);
}
@ -104,7 +104,7 @@ KResultOr<size_t> TTY::read(FileDescription&, size_t, UserOrKernelBuffer& buffer
KResultOr<size_t> TTY::write(FileDescription&, size_t, const UserOrKernelBuffer& buffer, size_t size)
{
if (Process::current()->pgid() != pgid()) {
(void)Process::current()->send_signal(SIGTTOU, nullptr);
[[maybe_unused]] auto rc = Process::current()->send_signal(SIGTTOU, nullptr);
return KResult(-EINTR);
}
@ -172,7 +172,7 @@ void TTY::emit(u8 ch, bool do_evaluate_block_conditions)
dbg() << tty_name() << ": VSUSP pressed!";
generate_signal(SIGTSTP);
if (auto original_process_parent = m_original_process_parent.strong_ref())
(void)original_process_parent->send_signal(SIGCHLD, nullptr);
[[maybe_unused]] auto rc = original_process_parent->send_signal(SIGCHLD, nullptr);
// TODO: Else send it to the session leader maybe?
return;
}
@ -288,7 +288,7 @@ void TTY::generate_signal(int signal)
Process::for_each_in_pgrp(pgid(), [&](auto& process) {
dbg() << tty_name() << ": Send signal " << signal << " to " << process;
// FIXME: Should this error be propagated somehow?
(void)process.send_signal(signal, nullptr);
[[maybe_unused]] auto rc = process.send_signal(signal, nullptr);
return IterationDecision::Continue;
});
}