5ead4e85f6b58a099269b27def1cd03c4526ae19
This is not a new system call at all (since kernel 2.2), however it's not exposed in glibc (a wrapper is exposed however in sigqueue(), but it substantially simplifies the system call). Since we want a nice fallback for sending signals on non-pidfd systems for pidfd_send_signal() let's wrap rt_sigqueueinfo() since it takes the same siginfo_t parameter.
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