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.popen(command, mode): Opens a pipe to another process.raise(sig): Raises the given signal.setSignalHandler(sig, f): Sets the signal handler for a given signal.