lib: extract igt_drop_root

Useful in other tests.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/drmtest.c b/lib/drmtest.c
index 7275b7fd..246f2f74 100644
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -1659,3 +1659,14 @@ void igt_system_suspend_autoresume(void)
 	ret = system("rtcwake -s 30 -m mem");
 	igt_assert(ret == 0);
 }
+
+void igt_drop_root(void)
+{
+	igt_assert(getuid() == 0);
+
+	igt_assert(setgid(2) == 0);
+	igt_assert(setuid(2) == 0);
+
+	igt_assert(getgid() == 2);
+	igt_assert(getuid() == 2);
+}
diff --git a/lib/drmtest.h b/lib/drmtest.h
index a8de2b49..0240a053 100644
--- a/lib/drmtest.h
+++ b/lib/drmtest.h
@@ -357,4 +357,7 @@ void igt_enable_prefault(void);
 /* suspend and auto-resume system */
 void igt_system_suspend_autoresume(void);
 
+/* dropping priviledges */
+void igt_drop_root(void);
+
 #endif /* DRMTEST_H */