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Signals are messages passed by system to running processes.
Signal management functions
| sigaction | detailed signal management |
| sigaltstack | set/get signal alternate stack context |
| sigignore sigpause | simplified signal management |
| sighold sigrelse | simplified signal management |
| sigset signal | simplified signal management |
| sigpending | examine blocked and pending signals |
| sigprocmask | change or examine signal mask |
| sigsuspend | install a signal mask and suspend process |
| sigsend sigsendset | send a signal to a process or group of processes |