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   signal    ( 7 )

обзор сигналов (overview of signals)
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Примечание (Note)

For a discussion of async-signal-safe functions, see
       signal-safety(7).


       The /proc/[pid]/task/[tid]/status file contains various fields
       that show the signals that a thread is blocking (SigBlk),
       catching (SigCgt), or ignoring (SigIgn).  (The set of signals
       that are caught or ignored will be the same across all threads in
       a process.)  Other fields show the set of pending signals that
       are directed to the thread (SigPnd) as well as the set of pending
       signals that are directed to the process as a whole (ShdPnd).
       The corresponding fields in /proc/[pid]/status show the
       information for the main thread.  See proc(5) for further
       details.