cast last argument of execl; check for errors in dup2

diff --git a/dyn-nsupdate.cpp b/dyn-nsupdate.cpp
index 4cb7ead86ec2ff1c178cffedee3cbb7037b66597..7c39136e37c1321795ccf7718eb59b4538e874ae 100644 (file)
--- a/dyn-nsupdate.cpp
+++ b/dyn-nsupdate.cpp
@@ -77,9 +77,12 @@ int main(int argc, const char ** argv)
                /* We're in the child */
                /* Close write end, use read and as stdin */
                close(pipe_ends[1]);
-               dup2(pipe_ends[0], fileno(stdin));
+               if (dup2(pipe_ends[0], fileno(stdin)) < 0) {
+                       std::cerr << "There was an error redirecting stdin." << std::endl;
+                       exit(1);
+               }
                /* exec nsupdate */
-               execl(nsupdate.c_str(), nsupdate.c_str(), "-k", keyfile.c_str(), NULL);
+               execl(nsupdate.c_str(), nsupdate.c_str(), "-k", keyfile.c_str(), (char *)NULL);
                /* There was an error */
                std::cerr << "There was an error executing nsupdate." << std::endl;
                exit(1);