File::GetFileSpec() support for linux patch from Stephen Wilson.

llvm-svn: 125181

lldb/include/lldb/Host/File.h

@@ -11,6 +11,8 @@
 #define liblldb_File_h_
 #if defined(__cplusplus)
 
+#include <stdio.h>
+
 #include "lldb/lldb-private.h"
 
 namespace lldb_private {

lldb/include/lldb/lldb-enumerations.h

@@ -85,7 +85,7 @@ typedef enum ByteOrder
     eByteOrderInvalid   = 0,
     eByteOrderBig       = 1,
     eByteOrderPDP       = 2,
-    eByteOrderLittle    = 4,
+    eByteOrderLittle    = 4
 } ByteOrder;
 
 //----------------------------------------------------------------------

lldb/source/Host/common/File.cpp

@@ -269,8 +269,24 @@ File::GetFileSpec (FileSpec &file_spec) const
     {
         error.SetErrorString("invalid file handle");
     }
+#elif defined(__linux__)
+    char proc[64];
+    char path[PATH_MAX];
+    if (::snprintf(proc, sizeof(proc), "/proc/self/fd/%d", GetDescriptor()) < 0)
+        error.SetErrorString ("Cannot resolve file descriptor\n");
+    else
+    {
+        ssize_t len;
+        if ((len = ::readlink(proc, path, sizeof(path) - 1)) == -1)
+            error.SetErrorToErrno();
+        else
+        {
+            path[len] = '\0';
+            file_spec.SetFile (path, false);
+        }
+    }
 #else
-    error.SetErrorString ("fcntl (fd, F_GETPATH, ...) is not supported on this platform");
+    error.SetErrorString ("File::GetFileSpec is not supported on this platform");
 #endif
 
     if (error.Fail())