Linux sandbox: add unit test sanity check.

Explicitly check that it's ok for a subprocess to use exit(3) instead
of exit(2) without breaking the test suite.

TBR=jln

Review URL: https://codereview.chromium.org/224953002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261651 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 21 insertions, 0 deletions

diff --git a/sandbox/linux/tests/unit_tests_unittest.cc b/sandbox/linux/tests/unit_tests_unittest.cc
index e4f03c9..5ec5648 100644
--- a/sandbox/linux/tests/unit_tests_unittest.cc
+++ b/sandbox/linux/tests/unit_tests_unittest.cc
@@ -4,7 +4,11 @@
 
 #include <signal.h>
 #include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
 
+#include "base/posix/eintr_wrapper.h"
 #include "sandbox/linux/tests/unit_tests.h"
 
 namespace sandbox {
@@ -29,6 +33,23 @@ SANDBOX_DEATH_TEST(UnitTests,
   raise(kExpectedSignalNumber);
 }
 
+// Test that a subprocess can be forked() and can use exit(3) instead of
+// _exit(2).
+TEST(UnitTests, SubProcessCanExit) {
+  pid_t child = fork();
+  ASSERT_NE(-1, child);
+
+  if (!child) {
+    exit(kExpectedExitCode);
+  }
+
+  int status = 0;
+  pid_t waitpid_ret = HANDLE_EINTR(waitpid(child, &status, 0));
+  EXPECT_EQ(child, waitpid_ret);
+  EXPECT_TRUE(WIFEXITED(status));
+  EXPECT_EQ(kExpectedExitCode, WEXITSTATUS(status));
+}
+
 }  // namespace
 
 }  // namespace sandbox