bmahler commented on code in PR #501:
URL: https://github.com/apache/mesos/pull/501#discussion_r1518222165
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src/linux/ebpf.cpp:
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@@ -14,4 +14,90 @@
// See the License for the specific language governing permissions and
// limitations under the License.
-#include "linux/ebpf.hpp"
\ No newline at end of file
+#include "linux/ebpf.hpp"
+
+#include <linux/bpf.h>
+#include <sys/syscall.h>
+
+#include <string>
+#include <vector>
+
+#include "stout/check.hpp"
+#include "stout/error.hpp"
+#include "stout/try.hpp"
+
+using std::string;
+using std::vector;
+
+namespace ebpf {
+
+Try<int, ErrnoError> bpf(int cmd, bpf_attr* attr, size_t size)
+{
+ // We retry the system call `attempts` times. The default is 5, as per
+ // what's done by libbpf:
+ // https://github.com/libbpf/libbpf/blob/master/src/bpf.h#L71-L75
+ int result, attempts = 5;
+ do {
+ result = (int)syscall(__NR_bpf, cmd, attr, size);
+ } while (result == EAGAIN && --attempts > 0);
Review Comment:
this needs to check errno
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