X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-consumerd%2Flttng-consumerd.c;h=3bc700dc948594a937c2ef543a8cbe4c3d4212f7;hb=a360b16d020bad284e0d17efcb64a7dc8a0932dc;hp=32571bddf36cfc94483eaf0f180694ac21a99fae;hpb=d14d33bf091e72b23b1f90ea18a0a01bed098b76;p=lttng-tools.git

diff --git a/src/bin/lttng-consumerd/lttng-consumerd.c b/src/bin/lttng-consumerd/lttng-consumerd.c
index 32571bddf..3bc700dc9 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
  */
@@ -242,11 +263,26 @@ int main(int argc, char **argv)
 
 	/* Daemonize */
 	if (opt_daemon) {
+		int i;
+
+		/*
+		 * fork
+		 * child: setsid, close FD 0, 1, 2, chdir /
+		 * parent: exit (if fork is successful)
+		 */
 		ret = daemon(0, 0);
 		if (ret < 0) {
-			perror("daemon");
+			PERROR("daemon");
 			goto error;
 		}
+		/*
+		 * We are in the child. Make sure all other file
+		 * descriptors are closed, in case we are called with
+		 * more opened file descriptors than the standard ones.
+		 */
+		for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
+			(void) close(i);
+		}
 	}
 
 	if (strlen(command_sock_path) == 0) {
@@ -272,6 +308,11 @@ 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);