Common POSIX functions and constants.
NSIG: NSIGSIGABRT: SIGABRTSIGALRM: SIGALRMSIGBUS: SIGBUSSIGCHLD: SIGCHLDSIGCONT: SIGCONTSIGFPE: SIGFPESIGHUP: SIGHUPSIGILL: SIGILLSIGINT: SIGINTSIGIO: SIGIOSIGKILL: SIGKILLSIGPIPE: SIGPIPESIGPROF: SIGPROFSIGQUIT: SIGQUITSIGSEGV: SIGSEGVSIGSTOP: SIGSTOPSIGSYS: SIGSYSSIGTERM: SIGTERMSIGTRAP: SIGTRAPSIGTSTP: SIGTSTPSIGTTIN: SIGTTINSIGTTOU: SIGTTOUSIGURG: SIGURGSIGUSR1: SIGUSR1SIGUSR2: SIGUSR2SIGVTALRM: SIGVTALRMSIGWINCH: SIGWINCHSIGXCPU: SIGXCPUSIGXFSZ: SIGXFSZpclose(pipe): Closes a pipe opened with popen.pipe: Pipe returned from popen().popen(command, mode): Opens a pipe to another process.command: Command to run.mode: Handle mode (r = read, w = write)raise(sig): Raises the given signal.sig: Signal to raise.setSignalHandler(sig, f): Sets the signal handler for a given signal.sig: Signal number to set for (see docs for valid signals).f: Method to use (null for default handling).