Yield execution in forked children back to PID 1

- Speeds up start-up a bit
 - Ensures the child is moved to its cgroup as soon as possible

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/service.c

@@ -25,7 +25,6 @@
 #include "config.h"		/* Generated by configure script */
 
 #include <ctype.h>		/* isblank() */
-#include <sched.h>		/* sched_yield() */
 #include <string.h>
 #include <sys/prctl.h>
 #include <sys/resource.h>
@@ -196,6 +195,8 @@ static int lredirect(svc_t *svc)
 		char *tag  = basename(svc->cmd);
 		char *prio = "daemon.info";
 
+		sched_yield();
+
 		fds = open(ptsname(fd), O_RDONLY);
 		close(fd);
 		if (fds == -1)
@@ -445,6 +446,8 @@ static int service_start(svc_t *svc)
 #endif
 		char *args[MAX_NUM_SVC_ARGS + 1];
 
+		sched_yield();
+
 		/* Set configured limits */
 		for (int i = 0; i < RLIMIT_NLIMITS; i++) {
 			if (setrlimit(i, &svc->rlimit[i]) == -1)