Add a new abstraction, SysConfig for platform independent system

configuration calls. Right now this just contains PreventCoreFiles so that
bugpoint can by platform independent.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16124 91177308-0d34-0410-b5e6-96231b3b80d8

lib/System/AIX/SysConfig.cpp

@@ -0,0 +1,27 @@
+//===- AIX/SysConfig.cpp - AIX SysConfig Implementation ---------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the AIX specific implementation of the SysConfig class.
+//
+//===----------------------------------------------------------------------===//
+
+// Include the generic unix implementation
+#include "../Unix/SysConfig.cpp"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only AIX specific code 
+//===          and must not be generic UNIX code (see ../Unix/SysConfig.cpp)
+//===----------------------------------------------------------------------===//
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab

lib/System/Cygwin/SysConfig.cpp

@@ -0,0 +1,27 @@
+//===- Cygwin/SysConfig.cpp - Cygwin SysConfig Implementation ---*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Cygwin specific implementation of the SysConfig class.
+//
+//===----------------------------------------------------------------------===//
+
+// Include the generic unix implementation
+#include "../Unix/SysConfig.cpp"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only Cygwin specific code 
+//===          and must not be generic UNIX code (see ../Unix/SysConfig.cpp)
+//===----------------------------------------------------------------------===//
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab

lib/System/Darwin/SysConfig.cpp

@@ -0,0 +1,27 @@
+//===- Darwin/SysConfig.cpp - Darwin SysConfig Implementation ---*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Darwin specific implementation of the SysConfig class.
+//
+//===----------------------------------------------------------------------===//
+
+// Include the generic unix implementation
+#include "../Unix/SysConfig.cpp"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only Darwin specific code 
+//===          and must not be generic UNIX code (see ../Unix/SysConfig.cpp)
+//===----------------------------------------------------------------------===//
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab

lib/System/Linux/SysConfig.cpp

@@ -0,0 +1,27 @@
+//===- Linux/SysConfig.cpp - Linux SysConfig Implementation -----*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Linux specific implementation of the Signals class.
+//
+//===----------------------------------------------------------------------===//
+
+// Include the generic unix implementation
+#include "../Unix/SysConfig.cpp"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only Linux specific code 
+//===          and must not be generic UNIX code (see ../Unix/Signals.cpp)
+//===----------------------------------------------------------------------===//
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab

lib/System/SunOS/SysConfig.cpp

@@ -0,0 +1,27 @@
+//===- SunOS/SysConfig.cpp - SunOS SysConfig Implementation -----*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the SunOS specific implementation of the SysConfig class.
+//
+//===----------------------------------------------------------------------===//
+
+// Include the generic unix implementation
+#include "../Unix/SysConfig.cpp"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only SunOS specific code 
+//===          and must not be generic UNIX code (see ../Unix/SysConfig.cpp)
+//===----------------------------------------------------------------------===//
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab

lib/System/SysConfig.cpp

@@ -0,0 +1,29 @@
+//===- SysConfig.cpp - System Configuration Support ---------------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencerand is distributed under the University 
+// of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file defines the operating system independent SysConfig abstraction.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/System/SysConfig.h"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//===          independent code. 
+//===----------------------------------------------------------------------===//
+
+}
+
+// Include the platform-specific parts of this class.
+#include "platform/SysConfig.cpp"
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab

lib/System/Unix/SysConfig.cpp

@@ -0,0 +1,35 @@
+//===- SysConfig.cpp - Generic UNIX System Configuration --------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file defines some functions for managing system configuration on Unix
+// systems.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include <sys/resource.h>
+
+namespace llvm {
+using namespace sys;
+
+
+// Some LLVM programs such as bugpoint produce core files as a normal part of
+// their operation. To prevent the disk from filling up, this configuration item
+// does what's necessary to prevent their generation.
+void PreventCoreFiles() {
+  struct rlimit rlim;
+  rlim.rlim_cur = rlim.rlim_max = 0;
+  int res = setrlimit(RLIMIT_CORE, &rlim);
+  if (res != 0)
+    ThrowErrno("Can't prevent core file generation");
+}
+
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab

lib/System/Unix/Unix.h

@@ -25,6 +25,7 @@
 #include <sys/types.h>
 #include <sys/param.h>
 #include <assert.h>
+#include <string>
 
 inline void ThrowErrno(const std::string& prefix) {
 #if defined __USE_XOPEN2K || defined __USE_MISC