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.
Author: https://github.com/timschumi Commit: cf0ad3715e Pull-request: https://github.com/SerenityOS/serenity/pull/13971 Reviewed-by: https://github.com/ADKaster ✅ Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/bgianfo ✅ Reviewed-by: https://github.com/kleinesfilmroellchen Reviewed-by: https://github.com/linusg
2025-08-08 17:19:13 +00:00 · 2022-05-13 13:15:45 +02:00 · 2022-05-13 13:15:45 +02:00 · cf0ad3715e · 2024-07-17 09:35:21 +09:00
commit cf0ad3715e
parent edbffb3c7a
4 changed files with 28 additions and 1 deletions
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@ -170,6 +170,7 @@ enum class NeedsBigProcessLock {
    S(sigpending, NeedsBigProcessLock::Yes)                 \
    S(sigprocmask, NeedsBigProcessLock::Yes)                \
    S(sigreturn, NeedsBigProcessLock::Yes)                  \
+    S(sigsuspend, NeedsBigProcessLock::Yes)                 \
    S(sigtimedwait, NeedsBigProcessLock::Yes)               \
    S(socket, NeedsBigProcessLock::Yes)                     \
    S(socketpair, NeedsBigProcessLock::Yes)                 \