add example of reading the real user id and the effective user id with chmod u+s"

1 files changed, 9 insertions, 0 deletions

diff --git a/uid_demo.c b/uid_demo.c
new file mode 100644
index 0000000..bcb77cc
--- /dev/null
+++ b/uid_demo.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, const char *argv[])
+{
+  printf("real uid: %d\n", getuid());
+  printf("effective uid: %d\n", geteuid());
+  return 0;
+}