Describe: UNIX environment complete signal inter-process communication

File list(Click to check if it's the file you need, and recomment it at the bottom):
  abort.c
  child.c
  critical.c
  Makefile
  mask.c
  ourhdr.h
  raise.c
  read1.c
  read2.c
  reenter.c
  setops.c
  sigtstp.c
  sigusr.c
  sleep1.c
  sleep2.c
  suspend1.c
  suspend2.c
  system.c
  tsleep2.c

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