* spawn.cc (spawn_guts): Remove long path prefix from win32 path

	before calling CreateProcess if path length is < MAX_PATH.

1 files changed, 14 insertions, 0 deletions

diff --git a/winsup/cygwin/spawn.cc b/winsup/cygwin/spawn.cc
index f90ffbcea..0a94282f0 100644
--- a/winsup/cygwin/spawn.cc
+++ b/winsup/cygwin/spawn.cc
@@ -472,6 +472,20 @@ spawn_guts (const char *prog_arg, const char *const *argv,
     }
 
   runpath = null_app_name ? NULL : real_path.get_wide_win32_path (runpath);
+  { /* If the executable path length is < MAX_PATH, make sure the long path
+       win32 prefix is removed from the path to make subsequent native Win32
+       child processes happy which are not long path aware. */
+    USHORT len = real_path.get_nt_native_path ()->Length;
+    if (len < (MAX_PATH + 4) * sizeof (WCHAR)
+    	|| (runpath[5] != L':'				/* UNC path */
+	    && len < (MAX_PATH + 6) * sizeof (WCHAR)))
+      {
+        PWCHAR r = runpath + 4;
+	if (r[1] != L':') /* UNC path */
+	  r += 2;
+	runpath = r;
+      }
+  }
 
   syscall_printf ("null_app_name %d (%W, %.9500W)", null_app_name,
 		  runpath, wone_line);