use /proc/sys/fs/nr_open in conjuction with /proc/sys/fs/file-max to determine limit of maximum number of opened files

1 files changed, 16 insertions, 7 deletions

diff --git a/accel-pppd/main.c b/accel-pppd/main.c
index 2e48c45..c408736 100644
--- a/accel-pppd/main.c
+++ b/accel-pppd/main.c
@@ -89,19 +89,28 @@ static void change_limits(void)
 {
 	FILE *f;
 	struct rlimit lim;
-	unsigned int file_max;
+	unsigned int file_max = 1024*1024;
+	unsigned int nr_open = 1024*1024;
+
+	f = fopen("/proc/sys/fs/nr_open", "r");
+	if (f) {
+		fscanf(f, "%d", &nr_open);
+		fclose(f);
+	}
 
 	f = fopen("/proc/sys/fs/file-max", "r");
 	if (f) {
 		fscanf(f, "%d", &file_max);
 		fclose(f);
+	}
+
+	if (file_max > nr_open)
+		file_max = nr_open;
 
-		lim.rlim_cur = file_max;
-		lim.rlim_max = file_max;
-		if (setrlimit(RLIMIT_NOFILE, &lim))
-			log_emerg("main: setrlimit: %s\n", strerror(errno));
-	} else
-		log_emerg("main: failed to open '/proc/sys/fs/file-max': %s\n", strerror(errno));
+	lim.rlim_cur = file_max;
+	lim.rlim_max = file_max;
+	if (setrlimit(RLIMIT_NOFILE, &lim))
+		log_emerg("main: setrlimit: %s\n", strerror(errno));
 }
 
 static void config_reload_notify(int r)