From 1ccfc0e3afa3de78f5b1cfda99869bb5e393ace6 Mon Sep 17 00:00:00 2001
From: David Goulet <dgoulet@efficios.com>
Date: Wed, 11 Apr 2012 17:56:29 -0400
Subject: [PATCH] Fix: increase consumer open files limit

Set ulimit of consumer when root so it can scales up to the session
daemon number of open files.

Signed-off-by: David Goulet <dgoulet@efficios.com>
---
 src/bin/lttng-consumerd/lttng-consumerd.c | 26 +++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/bin/lttng-consumerd/lttng-consumerd.c b/src/bin/lttng-consumerd/lttng-consumerd.c
index 32571bddf..9f2f02feb 100644
--- a/src/bin/lttng-consumerd/lttng-consumerd.c
+++ b/src/bin/lttng-consumerd/lttng-consumerd.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ipc.h>
+#include <sys/resource.h>
 #include <sys/shm.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
@@ -38,6 +39,7 @@
 #include <assert.h>
 #include <config.h>
 #include <urcu/compiler.h>
+#include <ulimit.h>
 
 #include <common/defaults.h>
 #include <common/common.h>
@@ -227,6 +229,25 @@ static void parse_args(int argc, char **argv)
 	}
 }
 
+/*
+ * Set open files limit to unlimited. This daemon can open a large number of
+ * file descriptors in order to consumer multiple kernel traces.
+ */
+static void set_ulimit(void)
+{
+	int ret;
+	struct rlimit lim;
+
+	/* The kernel does not allowed an infinite limit for open files */
+	lim.rlim_cur = 65535;
+	lim.rlim_max = 65535;
+
+	ret = setrlimit(RLIMIT_NOFILE, &lim);
+	if (ret < 0) {
+		PERROR("failed to set open files limit");
+	}
+}
+
 /*
  * main
  */
@@ -272,6 +293,11 @@ int main(int argc, char **argv)
 	/* Init */
 	lttng_consumer_init();
 
+	if (!getuid()) {
+		/* Set limit for open files */
+		set_ulimit();
+	}
+
 	/* create the consumer instance with and assign the callbacks */
 	ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
 		NULL, lttng_consumer_on_recv_stream, NULL);
-- 
2.34.1