-w, --wait seconds

New option so you can set the number of seconds to wait for and
check the daemon is still running.
The old code that periodically polled wasn't that reliable - in this 
case simpler == better.
Fixes #160

1 files changed, 47 insertions, 64 deletions

diff --git a/src/rc/start-stop-daemon.c b/src/rc/start-stop-daemon.c
index 53de7bd2..90e25747 100644
--- a/src/rc/start-stop-daemon.c
+++ b/src/rc/start-stop-daemon.c
@@ -549,7 +549,7 @@ expand_home(const char *home, const char *path)
 }
 
 #include "_usage.h"
-#define getoptstring "KN:R:Sbc:d:e:g:k:mn:op:s:tu:r:x:1:2:" getoptstring_COMMON
+#define getoptstring "KN:R:Sbc:d:e:g:k:mn:op:s:tu:r:w:x:1:2:" getoptstring_COMMON
 static const struct option longopts[] = {
 	{ "stop",         0, NULL, 'K'},
 	{ "nicelevel",    1, NULL, 'N'},
@@ -570,6 +570,7 @@ static const struct option longopts[] = {
 	{ "test",         0, NULL, 't'},
 	{ "user",         1, NULL, 'u'},
 	{ "chroot",       1, NULL, 'r'},
+	{ "wait",         1, NULL, 'w'},
 	{ "exec",         1, NULL, 'x'},
 	{ "stdout",       1, NULL, '1'},
 	{ "stderr",       1, NULL, '2'},
@@ -595,6 +596,7 @@ static const char * const longopts_help[] = {
 	"Test actions, don't do them",
 	"Change the process user",
 	"Chroot to this directory",
+	"Seconds to wait for daemon start",
 	"Binary to start/stop",
 	"Redirect stdout to file",
 	"Redirect stderr to file",
@@ -807,6 +809,11 @@ int start_stop_daemon(int argc, char **argv)
 		case 'a': /* --startas <name> */
 			startas = optarg;
 			break;
+		case 'w':
+			if (sscanf(optarg, "%d", &start_wait) != 1)
+				eerrorx("%s: `%s' not a number",
+					applet, optarg);
+			break;
 		case 'x':  /* --exec <executable> */
 			exec = optarg;
 			break;
@@ -1030,6 +1037,10 @@ int start_stop_daemon(int argc, char **argv)
 		eindent();
 	}
 
+	/* Remove existing pidfile */
+	if (pidfile)
+		unlink(pidfile);
+
 	if (background)
 		signal_setup(SIGCHLD, handle_signal);
 
@@ -1216,78 +1227,50 @@ int start_stop_daemon(int argc, char **argv)
 
 	/* Wait a little bit and check that process is still running
 	   We do this as some badly written daemons fork and then barf */
-	if ((p = getenv("SSD_STARTWAIT")) ||
-	    (p = rc_conf_value("rc_start_wait")))
+	if (start_wait == 0 &&
+	    ((p = getenv("SSD_STARTWAIT")) ||
+	     (p = rc_conf_value("rc_start_wait"))))
 	{
-		if (sscanf(p, "%u", &start_wait) == 1)
-			start_wait *= 1000000;
-		else
+		if (sscanf(p, "%u", &start_wait) != 1)
 			start_wait = 0;
 	}
 
 	if (start_wait > 0) {
 		struct timespec ts;
-		int nloops = start_wait / POLL_INTERVAL;
-		int nloopsp = WAIT_PIDFILE / POLL_INTERVAL;
 		bool alive = false;
-
-		ts.tv_sec = 0;
-		ts.tv_nsec = POLL_INTERVAL;
-
-		while (nloops) {
-			if (nanosleep(&ts, NULL) == -1) {
-				if (errno == EINTR)
-					eerror("%s: caught an interrupt", applet);
-				else {
-					eerror("%s: nanosleep: %s", applet, strerror(errno));
-					return 0;
-				}
-			}
-
-			/* We wait for a specific amount of time for a pidfile
-			 * to be created.
-			 * Once everything is in place we then wait some more
-			 * to ensure that the daemon really is running and won't
-			 * abort due to a config error. */
-			if (!background && pidfile && nloopsp)
-				nloopsp--;
-			else
-				nloops--;
-
-			/* This is knarly.
-			 * If we backgrounded then we know the exact pid.
-			 * Otherwise if we have a pidfile then it *may* know
-			 * the exact pid.
-			 * Failing that, we'll have to query processes.
-			 * We sleep first as some programs like ntp like to
-			 * fork, and write their pidfile a LONG time later. */
-			if (background) {
-				if (kill (pid, 0) == 0)
-					alive = true;
-			} else {
-				if (pidfile) {
-					/* The pidfile may not have been
-					 * written yet - give it some time */
-					if ((pid = get_pid(pidfile, true)) == -1) {
-						if (! nloopsp)
-							eerrorx("%s: did not "
-								"create a valid"
-								" pid in `%s'",
-								applet, pidfile);
-						alive = true;
-						pid = 0;
-					} else
-						nloopsp = 0;
-				} else
-					pid = 0;
-				if (do_stop(exec, (const char *const *)margv,
-					    pid, uid, 0, true, false, true) > 0)
-					alive = true;
+		
+		ts.tv_sec = start_wait;
+		ts.tv_nsec = 0;
+		if (nanosleep(&ts, NULL) == -1) {
+			if (errno == EINTR)
+				eerror("%s: caught an interrupt", applet);
+			else {
+				eerror("%s: nanosleep: %s",
+				       applet, strerror(errno));
+				return 0;
 			}
-
-			if (!alive)
-				eerrorx("%s: %s died", applet, exec);
 		}
+		if (background) {
+			if (kill(pid, 0) == 0)
+				alive = true;
+		} else {
+			if (pidfile) {
+				pid = get_pid(pidfile, true);
+				if (pid == -1) {
+					eerrorx("%s: did not "
+						"create a valid"
+						" pid in `%s'",
+						applet, pidfile);
+				}
+			} else
+				pid = 0;
+			if (do_stop(exec, (const char *const *)margv,
+				    pid, uid, 0, true, false, true) > 0)
+				alive = true;
+		}
+
+		if (!alive)
+			eerrorx("%s: %s died", applet, exec);
 	}
 
 	if (svcname)