#include <signal.h>#include "sig.h"void sig_hangupblock() { sig_block(SIGHUP); }void sig_hangupunblock() { sig_unblock(SIGHUP); }void sig_hangupcatch(f) void (*f)(); { sig_catch(SIGHUP,f); }void sig_hangupdefault() { sig_catch(SIGHUP,SIG_DFL); }