nset 163 src/popen.c sigset_t oset, nset; nset 175 src/popen.c sigemptyset(&nset); nset 176 src/popen.c sigaddset(&nset, SIGINT); nset 177 src/popen.c sigaddset(&nset, SIGQUIT); nset 178 src/popen.c sigaddset(&nset, SIGHUP); nset 179 src/popen.c (void) sigprocmask(SIG_BLOCK, &nset, &oset);