sigchld_handler
sa.sa_handler = sigchld_handler;
void sigchld_handler(int);
sa.sa_handler = sigchld_handler;
void sigchld_handler(int);
sa.sa_handler = sigchld_handler;
void sigchld_handler(int);
ssh_signal(SIGCHLD, sigchld_handler);
ssh_signal(SIGCHLD, sigchld_handler);
sigchld_handler(int),
sact.sa_handler = sigchld_handler;
signal_set(&sigchld_ev, SIGCHLD, sigchld_handler, NULL);
void sigchld_handler(int, short, void *);