GN: aix port along with linux_s390x, linux_ppc64 and linux_ppc64le support.

base/process/launch_posix.cc

Index: base/process/launch_posix.cc
diff --git a/base/process/launch_posix.cc b/base/process/launch_posix.cc
index 2184051552ddb708feaba23fa70d3b3f3837cd0d..7550a36f521440e0189603846d5d10f1bd4ed413 100644
--- a/base/process/launch_posix.cc
+++ b/base/process/launch_posix.cc
@@ -44,7 +44,7 @@
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_AIX)
 #include <sys/prctl.h>
 #endif
 
@@ -113,7 +113,7 @@ sigset_t SetSignalMask(const sigset_t& new_sigmask) {
   return old_sigmask;
 }
 
-#if !defined(OS_LINUX) || \
+#if (!defined(OS_LINUX) && !defined(OS_AIX)) || \
     (!defined(__i386__) && !defined(__x86_64__) && !defined(__arm__))
 void ResetChildSignalHandlersToDefaults() {
   // The previous signal handlers are likely to be meaningless in the child's
@@ -211,7 +211,7 @@ struct ScopedDIRClose {
 // Automatically closes |DIR*|s.
 typedef std::unique_ptr<DIR, ScopedDIRClose> ScopedDIR;
 
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_AIX)
 static const char kFDDir[] = "/proc/self/fd";
 #elif defined(OS_MACOSX)
 static const char kFDDir[] = "/dev/fd";
@@ -341,7 +341,7 @@ Process LaunchProcess(const std::vector<std::string>& argv,
   }
 
   pid_t pid;
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_AIX)
   if (options.clone_flags) {
     // Signal handling in this function assumes the creation of a new
     // process, so we check that a thread is not being created by mistake
@@ -476,7 +476,7 @@ Process LaunchProcess(const std::vector<std::string>& argv,
 
     // Set NO_NEW_PRIVS by default. Since NO_NEW_PRIVS only exists in kernel
     // 3.5+, do not check the return value of prctl here.
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_AIX)
 #ifndef PR_SET_NO_NEW_PRIVS
 #define PR_SET_NO_NEW_PRIVS 38
 #endif
@@ -681,7 +681,7 @@ bool GetAppOutputWithExitCode(const CommandLine& cl,
 
 #endif  // !defined(OS_NACL_NONSFI)
 
-#if defined(OS_LINUX) || defined(OS_NACL_NONSFI)
+#if defined(OS_LINUX) || defined(OS_NACL_NONSFI) || defined(OS_AIX)
 namespace {
 
 bool IsRunningOnValgrind() {