Provide IRT process interface

src/untrusted/nacl/nacl.scons

Index: src/untrusted/nacl/nacl.scons
diff --git a/src/untrusted/nacl/nacl.scons b/src/untrusted/nacl/nacl.scons
index 53212f6941accdcc1357f058bd829e731ce2a73e..c1944fb991093cf52a395327082e530ab2d21a00 100644
--- a/src/untrusted/nacl/nacl.scons
+++ b/src/untrusted/nacl/nacl.scons
@@ -43,7 +43,10 @@ SRCS_NEWLIB_SYSCALL =  [
     'getdents.c',
     'getpagesize.c',
     'getpid.c',
+    'getppid.c',
+    'getsid.c',
     'gettimeofday.c',
+    'kill.c',
     'link.c',
     'lock.c',
     'lseek.c',
@@ -57,18 +60,26 @@ SRCS_NEWLIB_SYSCALL =  [
     'nacl_irt_fdio.c',
     'nacl_irt_filename.c',
     'open.c',
+    'pipe.c',
+    'posix_spawn.c',
     'read.c',
     'readlink.c',
     'rename.c',
     'rmdir.c',
     'sbrk.c',
     'sched_yield.c',
+    'setpgid.c',
+    'setsid.c',
+    'signal.c',
+    'sigprocmask.c',
     'stat.c',
     'symlink.c',
     'sysconf.c',
     'truncate.c',
     'unlink.c',
     'utimes.c',
+    'wait.c',
+    'waitpid.c',
     'write.c',
 ]
 
@@ -86,7 +97,6 @@ SRCS_NEWLIB_STUBS = [
     'stubs/getgid.c',
     'stubs/getlogin.c',
     'stubs/getrusage.c',
-    'stubs/getppid.c',
     'stubs/getpwent.c',
     'stubs/getpwnam.c',
     'stubs/getpwnam_r.c',
@@ -96,10 +106,8 @@ SRCS_NEWLIB_STUBS = [
     'stubs/getwd.c',
     'stubs/ioctl.c',
     'stubs/issetugid.c',
-    'stubs/kill.c',
     'stubs/lchown.c',
     'stubs/llseek.c',
-    'stubs/pipe.c',
     'stubs/pselect.c',
     'stubs/select.c',
     'stubs/setegid.c',
@@ -108,16 +116,12 @@ SRCS_NEWLIB_STUBS = [
     'stubs/setpwent.c',
     'stubs/settimeofday.c',
     'stubs/setuid.c',
-    'stubs/signal.c',
-    'stubs/sigprocmask.c',
     'stubs/times.c',
     'stubs/ttyname.c',
     'stubs/ttyname_r.c',
     'stubs/umask.c',
     'stubs/utime.c',
     'stubs/vfork.c',
-    'stubs/wait.c',
-    'stubs/waitpid.c',
 ]
 
 SRCS_NEWLIB_MISC = [