methods that were recently added to the interface.

llvm-svn: 21401

gdb debugger doesn't get confused on which file it is reading (the one in
lib/System or the one in lib/System/{Win32,Unix})

llvm-svn: 19426

on 64-bit Windows.

llvm-svn: 19393

console or not.

llvm-svn: 19233

llvm-svn: 19201

* Move implementation of sys::PreventCoreFiles function to this file from
  the now defunct SysConfig abstraction.

llvm-svn: 19159

llvm-svn: 19074

the ru_maxrss field as an approximation.

llvm-svn: 19072

llvm-svn: 19071

* Implement GetMallocUsage to get usage of malloc heap
* Implement GetMemoryUsage to get total memory usage of process
* Implement GetTimeUsage to get elapsed/user/system time

llvm-svn: 19055

llvm-svn: 16290

llvm-svn: 16288

"Program" operating system concept (find and execute programs).

llvm-svn: 16084

note individually but these essence of it is to not derive from
std::string, clarify the interface, and provide better documentation.
There is now also (untested) implementations for AIX, Darwin, and SunOS.

llvm-svn: 16078

llvm-svn: 16048