Debugger support: introduce LTTNG_DEBUG_NOCLONE env. var.

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

diff --git a/src/common/runas.c b/src/common/runas.c
index 7dee28abedc6ce1f2d518e32a7d64d5c1a6cd3f4..4742a792eca105f35f1a8e2d194db9aeecd55a66 100644 (file)
--- a/src/common/runas.c
+++ b/src/common/runas.c
@@ -200,7 +200,7 @@ int child_run_as(void *_data)
 }
 
 static
-int run_as(int (*cmd)(void *data), void *data, uid_t uid, gid_t gid)
+int run_as_clone(int (*cmd)(void *data), void *data, uid_t uid, gid_t gid)
 {
        struct run_as_data run_as_data;
        int ret = 0;
@@ -292,6 +292,29 @@ end:
        return retval.i;
 }
 
+/*
+ * To be used on setups where gdb has issues debugging programs using
+ * clone/rfork. Note that this is for debuging ONLY, and should not be
+ * considered secure.
+ */
+static
+int run_as_noclone(int (*cmd)(void *data), void *data, uid_t uid, gid_t gid)
+{
+       return cmd(data);
+}
+
+static
+int run_as(int (*cmd)(void *data), void *data, uid_t uid, gid_t gid)
+{
+       if (!getenv("LTTNG_DEBUG_NOCLONE")) {
+               DBG("Using run_as_clone");
+               return run_as_clone(cmd, data, uid, gid);
+       } else {
+               DBG("Using run_as_noclone");
+               return run_as_noclone(cmd, data, uid, gid);
+       }
+}
+
 int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid)
 {
        struct run_as_mkdir_data data;