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About signalfd(): this patch doesn't provide any information or tool to decode data written to the file descriptor. We should expose the signalfd_siginfo structure or you cannot handle more than one signal (how do you know which signal numbers were raised?). Example with ctypes:
class signalfd_siginfo(Structure):
 _fields_ = (
 ('ssi_signo', c_uint32), # Signal number
 ('ssi_errno', c_int32), # Error number (unused)
 ('ssi_code', c_int32), # Signal code
 ('ssi_pid', c_uint32), # PID of sender
 ('ssi_uid', c_uint32), # Real UID of sender
 ('ssi_fd', c_int32), # File descriptor (SIGIO)
 ('ssi_tid', c_uint32), # Kernel timer ID (POSIX timers)
 ('ssi_band', c_uint32), # Band event (SIGIO)
 ('ssi_overrun', c_uint32), # POSIX timer overrun count
 ('ssi_trapno', c_uint32), # Trap number that caused signal
 ('ssi_status', c_int32), # Exit status or signal (SIGCHLD)
 ('ssi_int', c_int32), # Integer sent by sigqueue(2)
 ('ssi_ptr', c_uint64), # Pointer sent by sigqueue(2)
 ('ssi_utime', c_uint64), # User CPU time consumed (SIGCHLD)
 ('ssi_stime', c_uint64), # System CPU time consumed (SIGCHLD)
 ('ssi_addr', c_uint64), # Address that generated signal
 # (for hardware-generated signals)
 ('_padding', c_char * 46), # Pad size to 128 bytes (allow for
 # additional fields in the future)
 )