root/usr/lib/posix/signal/

[..]
  1. Makefile.inc
  2. __exception.c
  3. pause.c
  4. sigaction.c
  5. sigcompat.c
  6. siglist.c
  7. signal.c
  8. sigpending.c
  9. sigprocmask.c
  10. sigsuspend.c
[..]