Use of NULL in execlp() must have a pointer cast.

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/linux/SystemdMeter.c b/linux/SystemdMeter.c
index 567cfc7c..297cc253 100644
--- a/linux/SystemdMeter.c
+++ b/linux/SystemdMeter.c
@@ -219,6 +219,8 @@ static void updateViaExec(void) {
          exit(1);
       dup2(fdnull, STDERR_FILENO);
       close(fdnull);
+      // Use of NULL in variadic functions must have a pointer cast.
+      // The NULL constant is not required by standard to have a pointer type.
       execlp("systemctl",
              "systemctl",
              "show",
@@ -227,7 +229,7 @@ static void updateViaExec(void) {
              "--property=NNames",
              "--property=NJobs",
              "--property=NInstalledJobs",
-             NULL);
+             (char *)NULL);
       exit(127);
    }
    close(fdpair[1]);