Terminate daemon using the socket status instead of watching SIGCHLD or

kill()ing child process.

"Looks good to me" millert@
ok benno@

2 files changed, 27 insertions, 61 deletions

diff --git a/usr.sbin/httpd/httpd.c b/usr.sbin/httpd/httpd.c
index f5682a863d8..4c73252e5f7 100644
--- a/usr.sbin/httpd/httpd.c
+++ b/usr.sbin/httpd/httpd.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: httpd.c,v 1.58 2016/08/26 12:24:21 rzalamena Exp $	*/
+/*	$OpenBSD: httpd.c,v 1.59 2016/08/30 13:46:37 rzalamena Exp $	*/
 
 /*
  * Copyright (c) 2014 Reyk Floeter <reyk@openbsd.org>
@@ -20,7 +20,6 @@
 #include <sys/queue.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
-#include <sys/wait.h>
 #include <sys/resource.h>
 
 #include <netinet/in.h>
@@ -70,56 +69,11 @@ void
 parent_sig_handler(int sig, short event, void *arg)
 {
 	struct privsep	*ps = arg;
-	int		 die = 0, status, fail, id;
-	pid_t		 pid;
-	char		*cause;
 
 	switch (sig) {
 	case SIGTERM:
 	case SIGINT:
-		die = 1;
-		/* FALLTHROUGH */
-	case SIGCHLD:
-		do {
-			int len;
-
-			pid = waitpid(WAIT_ANY, &status, WNOHANG);
-			if (pid <= 0)
-				continue;
-
-			fail = 0;
-			if (WIFSIGNALED(status)) {
-				fail = 1;
-				len = asprintf(&cause, "terminated; signal %d",
-				    WTERMSIG(status));
-			} else if (WIFEXITED(status)) {
-				if (WEXITSTATUS(status) != 0) {
-					fail = 1;
-					len = asprintf(&cause,
-					    "exited abnormally");
-				} else
-					len = asprintf(&cause, "exited okay");
-			} else
-				fatalx("unexpected cause of SIGCHLD");
-
-			if (len == -1)
-				fatal("asprintf");
-
-			die = 1;
-
-			for (id = 0; id < PROC_MAX; id++)
-				if (pid == ps->ps_pid[id]) {
-					if (fail)
-						log_warnx("lost child: %s %s",
-						    ps->ps_title[id], cause);
-					break;
-				}
-
-			free(cause);
-		} while (pid > 0 || (pid == -1 && errno == EINTR));
-
-		if (die)
-			parent_shutdown(ps->ps_env);
+		parent_shutdown(ps->ps_env);
 		break;
 	case SIGHUP:
 		log_info("%s: reload requested with SIGHUP", __func__);
@@ -247,7 +201,7 @@ main(int argc, char *argv[])
 	proc_init(ps, procs, nitems(procs));
 	log_procinit("parent");
 
-	if (pledge("stdio rpath wpath cpath inet dns proc ioctl sendfd",
+	if (pledge("stdio rpath wpath cpath inet dns ioctl sendfd",
 	    NULL) == -1)
 		fatal("pledge");
 
@@ -255,14 +209,12 @@ main(int argc, char *argv[])
 
 	signal_set(&ps->ps_evsigint, SIGINT, parent_sig_handler, ps);
 	signal_set(&ps->ps_evsigterm, SIGTERM, parent_sig_handler, ps);
-	signal_set(&ps->ps_evsigchld, SIGCHLD, parent_sig_handler, ps);
 	signal_set(&ps->ps_evsighup, SIGHUP, parent_sig_handler, ps);
 	signal_set(&ps->ps_evsigpipe, SIGPIPE, parent_sig_handler, ps);
 	signal_set(&ps->ps_evsigusr1, SIGUSR1, parent_sig_handler, ps);
 
 	signal_add(&ps->ps_evsigint, NULL);
 	signal_add(&ps->ps_evsigterm, NULL);
-	signal_add(&ps->ps_evsigchld, NULL);
 	signal_add(&ps->ps_evsighup, NULL);
 	signal_add(&ps->ps_evsigpipe, NULL);
 	signal_add(&ps->ps_evsigusr1, NULL);
diff --git a/usr.sbin/httpd/proc.c b/usr.sbin/httpd/proc.c
index 6f6b8db3560..a060250a001 100644
--- a/usr.sbin/httpd/proc.c
+++ b/usr.sbin/httpd/proc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: proc.c,v 1.17 2016/08/27 11:13:16 rzalamena Exp $	*/
+/*	$OpenBSD: proc.c,v 1.18 2016/08/30 13:46:37 rzalamena Exp $	*/
 
 /*
  * Copyright (c) 2010 - 2014 Reyk Floeter <reyk@openbsd.org>
@@ -125,23 +125,37 @@ proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
 void
 proc_kill(struct privsep *ps)
 {
+	char		*cause;
 	pid_t		 pid;
-	unsigned int	 i;
+	int		 len, status;
 
 	if (privsep_process != PROC_PARENT)
 		return;
 
-	for (i = 0; i < PROC_MAX; i++) {
-		if (ps->ps_pid[i] == 0)
-			continue;
-		killpg(ps->ps_pid[i], SIGTERM);
-	}
+	proc_close(ps);
 
 	do {
-		pid = waitpid(WAIT_ANY, NULL, 0);
-	} while (pid != -1 || (pid == -1 && errno == EINTR));
+		pid = waitpid(WAIT_ANY, &status, 0);
+		if (pid <= 0)
+			continue;
 
-	proc_close(ps);
+		if (WIFSIGNALED(status)) {
+			len = asprintf(&cause, "terminated; signal %d",
+			    WTERMSIG(status));
+		} else if (WIFEXITED(status)) {
+			if (WEXITSTATUS(status) != 0)
+				len = asprintf(&cause, "exited abnormally");
+			else
+				len = asprintf(&cause, "exited okay");
+		} else
+			len = -1;
+
+		if (len != -1) {
+			log_warnx("lost child: pid %u %s", pid, cause);
+			free(cause);
+		} else
+			log_warnx("lost child: pid %u", pid);
+	} while (pid != -1 || (pid == -1 && errno == EINTR));
 }
 
 void