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	Ensure children are reaped periodically - sinit - suckless init
	git clone git://git.suckless.org/sinit
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	---
	commit 170d599d58efee6c9be675a85c6e435d68e8a2de
	parent 731f65fc82afcd474f4c682f9f0069e5c80c86dd
	Author: sin <[email protected]>
	Date: Sun, 18 Mar 2018 13:35:38 +0000

	Ensure children are reaped periodically

	There is a pathological case where a parent receives SIGCHLD after its
	child dies but does not reap it. After the parent dies, the child is
	reparented to init but SIGCHLD is not redelivered.

	To fix this, periodically check if there are zombies pending to be
	reaped.

	Diffstat:
	M sinit.c \| 6 +++++-

	1 file changed, 5 insertions(+), 1 deletion(-)
	---
	diff --git a/sinit.c b/sinit.c
	@@ -7,7 +7,8 @@
	#include <stdlib.h>
	#include <unistd.h>

	-#define LEN(x) (sizeof (x) / sizeof *(x))
	+#define LEN(x) (sizeof (x) / sizeof *(x))
	+#define TIMEO 30

	static void sigpoweroff(void);
	static void sigreap(void);
	@@ -20,6 +21,7 @@ static struct {
	} sigmap[] = {
	{ SIGUSR1, sigpoweroff },
	{ SIGCHLD, sigreap },
	+ { SIGALRM, sigreap },
	{ SIGINT, sigreboot },
	};

	@@ -40,6 +42,7 @@ main(void)
	sigprocmask(SIG_BLOCK, &set, NULL);
	spawn(rcinitcmd);
	while (1) {
	+ alarm(TIMEO);
	sigwait(&set, &sig);
	for (i = 0; i < LEN(sigmap); i++) {
	if (sigmap[i].sig == sig) {
	@@ -63,6 +66,7 @@ sigreap(void)
	{
	while (waitpid(-1, NULL, WNOHANG) > 0)
	;
	+ alarm(TIMEO);
	}

	static void