set_option (OPTSIGNALSBLOCKED);
set_option (OPTSYSSIGNALSBLOCKED);
void mutt_block_signals_system (void){  struct sigaction sa;  if (! option (OPTSYSSIGNALSBLOCKED))  {    /* POSIX: ignore SIGINT and SIGQUIT & block SIGCHLD  before exec */    sa.sa_handler = SIG_IGN;    sa.sa_flags = 0;    sigaction (SIGINT, &sa, NULL);    sigaction (SIGQUIT, &sa, NULL);    sigemptyset (&SigsetSys);    sigaddset (&SigsetSys, SIGCHLD);    sigprocmask (SIG_BLOCK, &SigsetSys, 0);    set_option (OPTSIGNALSBLOCKED);  }}