Initial import of the new binary lttng-relayd

[lttng-tools.git] / src / common / runas.c

diff --git a/src/common/runas.c b/src/common/runas.c
index e0c317c4e40347fb7001b74fb9900e9bcfafe32f..3a89cc9ab8d1f73795ca2d9f963fd34423911cbb 100644 (file)
--- a/src/common/runas.c
+++ b/src/common/runas.c
@@ -2,18 +2,18 @@
  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; only version 2 of the License.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  * more details.
  *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA  02111-1307, USA.
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _GNU_SOURCE
@@ -38,6 +38,10 @@
 
 #define RUNAS_CHILD_STACK_SIZE 10485760
 
+#ifndef MAP_STACK
+#define MAP_STACK              0
+#endif
+
 #ifdef __FreeBSD__
 /* FreeBSD MAP_STACK always return -ENOMEM */
 #define LTTNG_MAP_STACK                0
@@ -149,13 +153,14 @@ int _open(void *_data)
 static
 int child_run_as(void *_data)
 {
+       int ret;
        struct run_as_data *data = _data;
-       size_t writelen, writeleft, index;
+       ssize_t writelen;
+       size_t writeleft, index;
        union {
                int i;
                char c[sizeof(int)];
        } sendret;
-       int ret;
 
        /*
         * Child: it is safe to drop egid and euid while sharing the
@@ -313,8 +318,13 @@ static
 int run_as(int (*cmd)(void *data), void *data, uid_t uid, gid_t gid)
 {
        if (!getenv("LTTNG_DEBUG_NOCLONE")) {
+               int ret;
+
                DBG("Using run_as_clone");
-               return run_as_clone(cmd, data, uid, gid);
+               pthread_mutex_lock(&lttng_libc_state_lock);
+               ret = run_as_clone(cmd, data, uid, gid);
+               pthread_mutex_unlock(&lttng_libc_state_lock);
+               return ret;
        } else {
                DBG("Using run_as_noclone");
                return run_as_noclone(cmd, data, uid, gid);