1 files changed, 47 insertions, 0 deletions
diff --git a/reference/C/EXAMPLES/setuid.c b/reference/C/EXAMPLES/setuid.c
new file mode 100644
index 0000000..bce4a3d
--- /dev/null
+++ b/reference/C/EXAMPLES/setuid.c
@@ -0,0 +1,47 @@
+#include <sys/types.h>
+#include <unistd.h>
+main()
+{
+
+	/* Identify the person logged in (real ID). */
+
+  printf("getuid = %d\n", getuid());
+
+	/* Get the ID in use by this process (effective ID).
+	 * Normally this is the same as above but if the program is:
+	 *
+	 * o Owned by root (chown root progname).
+	 * o Had 'Set owner' set in the permissions (chmod u+s progname).
+	 * o The disk is not mounted 'nosetuid'.
+	 *
+	 * We can use 'setuid' and 'seteuid'.
+	 */
+
+  printf("geteuid = %d\n", geteuid());
+
+  (!geteuid())
+      ?
+      puts("setuid//setruid/seteuid will work.")
+      :
+      puts("setuid/setruid/seteuid will fail.");
+
+					/*  0 = OK
+					 * -1 = Fail
+					 */
+/*
+   printf("seteuid return code  = %d\n", seteuid(3570));
+
+   printf("getuid = %d\n", getuid());
+   printf("geteuid = %d\n", geteuid());
+
+   printf("seteuid return code  = %d\n", seteuid(0));
+
+   printf("getuid = %d\n", getuid());
+   printf("geteuid = %d\n", geteuid());
+*/
+
+  printf("setuid return code  = %d\n", setuid(4261));
+
+  printf("getuid = %d\n", getuid());
+  printf("geteuid = %d\n", geteuid());
+}