Add basic signal support & test #28
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Status
Depends on arceos#23.
Description
This PR adds basic signal support. Currently 32 POSIX standard signals are handled.
ANY_TRAP) is registered to handle signalsSignalManageris added toTaskExtforkon x86_64 is implemented to support the testsImplemented syscalls:
rt_sigprocmask、rt_sigaction、rt_sigreturn、rt_sigpending、kill