Enforce const-correctness in UNIX socket wrappers

[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl-helper.h

diff --git a/src/lib/lttng-ctl/lttng-ctl-helper.h b/src/lib/lttng-ctl/lttng-ctl-helper.h
index 58b3dba57fecb13c93a946fd8b759ace6b531ba1..b7a28268cb3b4ce83b95eb978667951527064212 100644 (file)
--- a/src/lib/lttng-ctl/lttng-ctl-helper.h
+++ b/src/lib/lttng-ctl/lttng-ctl-helper.h
@@ -18,7 +18,6 @@
 #ifndef LTTNG_CTL_HELPER_H
 #define LTTNG_CTL_HELPER_H
 
-#define _GNU_SOURCE
 #include <stdio.h>
 
 #include <common/sessiond-comm/sessiond-comm.h>
@@ -36,14 +35,14 @@ void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
                struct lttng_domain *src);
 
 /*
- * Sends the lttcomm message to the session daemon and fills buf of the
+ * Sends the lttcomm message to the session daemon and fills buf if the
  * returned data is not NULL.
  *
  * Return the size of the received data on success or else a negative lttng
  * error code. If buf is NULL, 0 is returned on success.
  */
 int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
-               void *vardata, size_t varlen, void **buf);
+               const void *vardata, size_t varlen, void **buf);
 
 /*
  * Use this if no variable length data needs to be sent.