Add support for the QNX operating system.

src/platform-posix.cc

Index: src/platform-posix.cc
diff --git a/src/platform-posix.cc b/src/platform-posix.cc
index 923cd8700ed9a062c8ed8ad7a505da253ae084dd..b19c54201c7a1e8adee4f3e26b15a726539e9a23 100644
--- a/src/platform-posix.cc
+++ b/src/platform-posix.cc
@@ -130,6 +130,13 @@ uint64_t OS::TotalPhysicalMemory() {
     return 0;
   }
   return static_cast<uint64_t>(memory_info.dwTotalPhys);
+#elif V8_OS_QNX
+  struct stat stat_buf;
+  if (stat("/proc", &stat_buf) != 0) {
+    UNREACHABLE();
+    return 0;
+  }
+  return static_cast<uint64_t>(stat_buf.st_size);
 #else
   intptr_t pages = sysconf(_SC_PHYS_PAGES);
   intptr_t page_size = sysconf(_SC_PAGESIZE);
@@ -247,7 +254,11 @@ void* OS::GetRandomMmapAddr() {
 
 
 size_t OS::AllocateAlignment() {
+#if defined(V8_OS_QNX)

[Benedikt Meurer, 2013/11/15 11:49:59]

Use #if V8_OS_QNX.

[c.truta, 2013/11/18 13:36:32]

D'oh! Oversight. Thank you.
I also added #if V8_OS_LINUX || ... because I noticed that, in Linux, it is
recommended to use sysconf instead of getpagesize, just as in QNX.

[Benedikt Meurer, 2013/11/19 07:01:27]

sysconf(_SC_PAGESIZE) just calls getpagesize() for glibc, ulibc and bionic, so
there's no reason add special case for Linux here. What is the reason to use
sysconf() on QNX?

+  return static_cast<size_t>(sysconf(_SC_PAGESIZE));
+#else
   return getpagesize();
+#endif
 }