add new Linux close_range() system call to bionic
See:
https://man7.org/linux/man-pages/man2/close_range.2.html
Note: 'man close_range' documents 'flags' as unsigned int,
while glibc unistd.h as just 'int'. Picking 'int' to match glibc,
though it probably doesn't matter.
BYPASS_INCLUSIVE_LANGUAGE_REASON=man is a cli command
Test: TreeHugger
Bug: 229913920
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1e2d1c8edc2ea28922d60f3ce3e534a784622cd1
diff --git a/tests/unistd_test.cpp b/tests/unistd_test.cpp
index 6d7e687..293b45a 100644
--- a/tests/unistd_test.cpp
+++ b/tests/unistd_test.cpp
@@ -1648,3 +1648,23 @@
auto t1 = std::chrono::steady_clock::now();
ASSERT_GE(t1-t0, 1s);
}
+
+TEST(UNISTD_TEST, close_range) {
+#if defined(__GLIBC__)
+ GTEST_SKIP() << "glibc too old";
+#else // __GLIBC__
+ int fd = open("/proc/version", O_RDONLY);
+ ASSERT_GE(fd, 0);
+
+ // Try to close the file descriptor (this requires a 5.9+ kernel)
+ if (close_range(fd, fd, 0) == 0) {
+ // we can't close it *again*
+ ASSERT_EQ(close(fd), -1);
+ ASSERT_EQ(errno, EBADF);
+ } else {
+ ASSERT_EQ(errno, ENOSYS);
+ // since close_range() failed, we can close it normally
+ ASSERT_EQ(close(fd), 0);
+ }
+#endif // __GLIBC__
+}