Build ForkWithFlags and part of NamespaceSandbox under nonsfi newlib.

sandbox/linux/system_headers/linux_signal.h

Index: sandbox/linux/system_headers/linux_signal.h
diff --git a/sandbox/linux/system_headers/linux_signal.h b/sandbox/linux/system_headers/linux_signal.h
index 5db7fc5ea1dba01b659232c92c03b21a42380d6e..94ee933e22642b353dfa491cb07d27bfc0fb4b8d 100644
--- a/sandbox/linux/system_headers/linux_signal.h
+++ b/sandbox/linux/system_headers/linux_signal.h
@@ -8,6 +8,27 @@
 // NOTE: On some toolchains, signal related ABI is incompatible with Linux's
 // (not undefined, but defined different values and in different memory
 // layouts). So, fill the gap here.
+#define LINUX_SIGHUP 1
+#define LINUX_SIGINT 2
+#define LINUX_SIGQUIT 3
+#define LINUX_SIGABRT 6
+#define LINUX_SIGBUS 7
+#define LINUX_SIGUSR1 10
+#define LINUX_SIGSEGV 11
+#define LINUX_SIGUSR2 12
+#define LINUX_SIGPIPE 13
+#define LINUX_SIGTERM 15
+#define LINUX_SIGCHLD 17
+#define LINUX_SIGSYS 31
+
+#define LINUX_SIG_BLOCK 0
+#define LINUX_SIG_UNBLOCK 1
+
+#define LINUX_SA_SIGINFO 4
+#define LINUX_SA_NODEFER 0x40000000
+#define LINUX_SA_RESTART 0x10000000
+
+#define LINUX_SIG_DFL 0
 
 #if defined(__native_client_nonsfi__)
 #if !defined(__i386__) && !defined(__arm__)
@@ -16,20 +37,6 @@
 
 #include <signal.h>
 
-#define LINUX_SIGBUS 7    // 10 in PNaCl toolchain.
-#define LINUX_SIGSEGV 11  // 11 in PNaCl toolchain. Defined for consistency.
-#define LINUX_SIGCHLD 17  // 20 in PNaCl toolchain.
-#define LINUX_SIGSYS 31   // 12 in PNaCl toolchain.
-
-#define LINUX_SIG_BLOCK 0    // 1 in PNaCl toolchain.
-#define LINUX_SIG_UNBLOCK 1  // 2 in PNaCl toolchain.
-
-#define LINUX_SA_SIGINFO 4           // 2 in PNaCl toolchain.
-#define LINUX_SA_NODEFER 0x40000000  // Undefined in PNaCl toolchain.
-#define LINUX_SA_RESTART 0x10000000  // Undefined in PNaCl toolchain.
-
-#define LINUX_SIG_DFL 0  // In PNaCl toolchain, unneeded cast is applied.
-
 struct LinuxSigInfo {
   int si_signo;
   int si_errno;
@@ -44,22 +51,27 @@ struct LinuxSigInfo {
 
 #else  // !defined(__native_client_nonsfi__)
 
-// Just alias the toolchain's value.
 #include <signal.h>
 
-#define LINUX_SIGBUS SIGBUS
-#define LINUX_SIGSEGV SIGSEGV
-#define LINUX_SIGCHLD SIGCHLD
-#define LINUX_SIGSYS SIGSYS
-
-#define LINUX_SIG_BLOCK SIG_BLOCK
-#define LINUX_SIG_UNBLOCK SIG_UNBLOCK
-
-#define LINUX_SA_SIGINFO SA_SIGINFO
-#define LINUX_SA_NODEFER SA_NODEFER
-#define LINUX_SA_RESTART SA_RESTART
-
-#define LINUX_SIG_DFL SIG_DFL
+static_assert(LINUX_SIGHUP == SIGHUP, "LINUX_SIGHUP == SIGHUP");
+static_assert(LINUX_SIGINT == SIGINT, "LINUX_SIGINT == SIGINT");
+static_assert(LINUX_SIGQUIT == SIGQUIT, "LINUX_SIGQUIT == SIGQUIT");
+static_assert(LINUX_SIGABRT == SIGABRT, "LINUX_SIGABRT == SIGABRT");
+static_assert(LINUX_SIGBUS == SIGBUS, "LINUX_SIGBUS == SIGBUS");
+static_assert(LINUX_SIGUSR1 == SIGUSR1, "LINUX_SIGUSR1 == SIGUSR1");
+static_assert(LINUX_SIGSEGV == SIGSEGV, "LINUX_SIGSEGV == SIGSEGV");
+static_assert(LINUX_SIGUSR2 == SIGUSR2, "LINUX_SIGUSR2 == SIGUSR2");
+static_assert(LINUX_SIGPIPE == SIGPIPE, "LINUX_SIGPIPE == SIGPIPE");
+static_assert(LINUX_SIGTERM == SIGTERM, "LINUX_SIGTERM == SIGTERM");
+static_assert(LINUX_SIGCHLD == SIGCHLD, "LINUX_SIGCHLD == SIGCHLD");
+static_assert(LINUX_SIGSYS == SIGSYS, "LINUX_SIGSYS == SIGSYS");
+static_assert(LINUX_SIG_BLOCK == SIG_BLOCK, "LINUX_SIG_BLOCK == SIG_BLOCK");
+static_assert(LINUX_SIG_UNBLOCK == SIG_UNBLOCK,
+              "LINUX_SIG_UNBLOCK == SIG_UNBLOCK");
+static_assert(LINUX_SA_SIGINFO == SA_SIGINFO, "LINUX_SA_SIGINFO == SA_SIGINFO");
+static_assert(LINUX_SA_NODEFER == SA_NODEFER, "LINUX_SA_NODEFER == SA_NODEFER");
+static_assert(LINUX_SA_RESTART == SA_RESTART, "LINUX_SA_RESTART == SA_RESTART");
+static_assert(LINUX_SIG_DFL == SIG_DFL, "LINUX_SIG_DFL == SIG_DFL");
 
 typedef siginfo_t LinuxSigInfo;