[MIPS] Add seccomp bpf support

sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc

Index: sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
diff --git a/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc b/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
index 3b7470b4176ac10e32ea650823061b3e63c4e431..e4b70f2d28aa65b640d9aed095f5c3835dee1c56 100644
--- a/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
+++ b/sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc
@@ -11,6 +11,7 @@
 #include <sys/types.h>
 #include <sys/utsname.h>
 #include <unistd.h>
+#include <sys/socket.h>
 
 #if defined(ANDROID)
 // Work-around for buggy headers in Android's NDK
@@ -29,6 +30,7 @@
 #include "sandbox/linux/seccomp-bpf/trap.h"
 #include "sandbox/linux/seccomp-bpf/verifier.h"
 #include "sandbox/linux/services/broker_process.h"
+#include "sandbox/linux/services/kernel_to_errno.h"
 #include "sandbox/linux/services/linux_syscalls.h"
 #include "sandbox/linux/tests/unit_tests.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -604,7 +606,7 @@ BPF_TEST(SandboxBPF, SigBus, RedirectAllSyscallsPolicy) {
   // more complex uses of signals where our use of the SIGBUS mask is not
   // 100% transparent. This is expected behavior.
   int fds[2];
-  BPF_ASSERT(pipe(fds) == 0);
+  BPF_ASSERT(socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0);
   bus_handler_fd_ = fds[1];
   struct sigaction sa = {};
   sa.sa_sigaction = SigBusHandler;
@@ -1676,7 +1678,7 @@ intptr_t PthreadTrapHandler(const struct arch_seccomp_data& args, void* aux) {
         (long long)args.args[5],
         msg);
   }
-  return -EPERM;
+  return KernelRetToErrno(EPERM);

[jln (very slow on Chromium), 2014/05/16 19:30:17]

ErrnoToKernelRet()

[nedeljko, 2014/05/22 17:38:55]

Done.

 }
 ErrorCode PthreadPolicyEquality(SandboxBPF* sandbox, int sysno, void* aux) {
   // This policy allows creating threads with pthread_create(). But it
@@ -1799,7 +1801,7 @@ static void PthreadTest() {
                             CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID | SIGCHLD,
                             0,
                             0,
-                            &pid) == -EPERM);
+                            &pid) == KernelRetToErrno(EPERM));
 }
 
 BPF_TEST(SandboxBPF, PthreadEquality, PthreadPolicyEquality) { PthreadTest(); }