bsd/kern/kern_exit.c

812 		 * If the parent is ignoring SIGCHLD, then POSIX requires
864 		psignal(pp, SIGCHLD);
982 			psignal(trace_parent, SIGCHLD);
1015 		 * If the parent is ignoring SIGCHLD, then POSIX requires
1211 			 * When SIGCHLD is blocked and wait() returns because the status
1213 			 * children processes, then any pending SIGCHLD signal is cleared.
1216 				int mask = sigmask(SIGCHLD);
1220 					/* we are blocking SIGCHLD signals.  clear any pending SIGCHLD.
1418 			siginfo.si_signo = SIGCHLD;
1457 			siginfo.si_signo = SIGCHLD;
1490 			siginfo.si_signo = SIGCHLD;
1593 		psignal(initproc, SIGCHLD);
1966 		psignal(pp, SIGCHLD);