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Kernel: Implement sigsuspend
using a SignalBlocker
`sigsuspend` was previously implemented using a poll on an empty set of file descriptors. However, this broke quite a few assumptions in `SelectBlocker`, as it verifies at least one file descriptor to be ready after waking up and as it relies on being notified by the file descriptor. A bare-bones `sigsuspend` may also be implemented by relying on any of the `sigwait` functions, but as `sigsuspend` features several (currently unimplemented) restrictions on how returns work, it is a syscall on its own.
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4 changed files with 28 additions and 1 deletions
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@ -334,6 +334,7 @@ public:
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ErrorOr<FlatPtr> sys$sigaltstack(Userspace<stack_t const*> ss, Userspace<stack_t*> old_ss);
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ErrorOr<FlatPtr> sys$sigprocmask(int how, Userspace<sigset_t const*> set, Userspace<sigset_t*> old_set);
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ErrorOr<FlatPtr> sys$sigpending(Userspace<sigset_t*>);
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ErrorOr<FlatPtr> sys$sigsuspend(Userspace<sigset_t const*>);
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ErrorOr<FlatPtr> sys$sigtimedwait(Userspace<sigset_t const*>, Userspace<siginfo_t*>, Userspace<timespec const*>);
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ErrorOr<FlatPtr> sys$getgroups(size_t, Userspace<gid_t*>);
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ErrorOr<FlatPtr> sys$setgroups(size_t, Userspace<gid_t const*>);
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