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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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@ -175,7 +175,8 @@ void siglongjmp(jmp_buf env, int val)
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// https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigsuspend.html
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int sigsuspend(sigset_t const* set)
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{
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return pselect(0, nullptr, nullptr, nullptr, nullptr, set);
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int rc = syscall(SC_sigsuspend, set);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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// https://pubs.opengroup.org/onlinepubs/009604499/functions/sigwait.html
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