From: Aleksei Vereshchagin <avereschagin@dev.rtsoft.ru>
Date: Fri, 10 Aug 2018 20:18:30 +0000 (+0300)
Subject: Try to open proc files several times due to problems with permissions
X-Git-Tag: submit/tizen/20180820.170401^0
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=94faa04e242cc6a1f17daea615504e07d4284387;p=sdk%2Ftools%2Fprofctl.git

Try to open proc files several times due to problems with permissions
---

diff --git a/profctl.c b/profctl.c
index 288cb6d..1c2e850 100644
--- a/profctl.c
+++ b/profctl.c
@@ -159,15 +159,36 @@ static void *outstat(void *arg)
 		exit(1);
 	}
 
-	pmstat = fopen(statmname, "r");
-	if (pmstat == NULL) {
-		perror("open /proc/$pid/statm");
-		exit(1);
+	// Sometimes we can't successfully open /proc/$pid files due to strange
+	// permission problems, so we retry to open it several times.
+
+	int retry = 0;
+	const int max_retry = 10;
+
+	for (; retry < max_retry; ++retry)
+	{
+		pmstat = fopen(statmname, "r");
+		if (pmstat == NULL) {
+			perror("open /proc/$pid/statm");
+			usleep(100000);
+			continue;
+		}
+		break;
+	}
+
+	for (; retry < max_retry; ++retry)
+	{
+		pstat = fopen(statname, "r");
+		if (pstat == NULL) {
+			perror("open /proc/$pid/stat");
+			usleep(100000);
+			continue;
+		}
+		break;
 	}
 
-	pstat = fopen(statname, "r");
-	if (pstat == NULL) {
-		perror("open /proc/$pid/stat");
+	if (statmname == NULL || statname == NULL)
+	{
 		exit(1);
 	}