Build fixes for fnl/musl

services/native_support/make_pty_pair.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/native_support/make_pty_pair.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
 #include <unistd.h>
 
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 
 namespace native_support {
 
 bool MakePtyPair(base::ScopedFD* master_fd,
                  base::ScopedFD* slave_fd,
                  int* errno_value) {
   DCHECK(master_fd);
   DCHECK(!master_fd->is_valid());  // Not very wrong, but unlikely.
   DCHECK(slave_fd);
   DCHECK(!slave_fd->is_valid());  // Not very wrong, but unlikely.
   DCHECK(errno_value);
 
-  // TODO(vtl): |getpt()| is a glibc extension.
+#if defined(FNL_MUSL)
+  base::ScopedFD master(posix_openpt(O_RDWR | O_NOCTTY));
+#else
+  // Android doesn't yet have posix_openpt
   base::ScopedFD master(getpt());
+#endif
   if (!master.is_valid()) {
     *errno_value = errno;
-    PLOG(ERROR) << "getpt()";
+    PLOG(ERROR) << "posix_openpt/getpt";
     return false;
   }
 
   if (grantpt(master.get()) < 0) {
     *errno_value = errno;
     PLOG(ERROR) << "grantpt()";
     return false;
   }
 
   if (unlockpt(master.get()) < 0) {
@@ skipping 15 matching lines @@
     PLOG(ERROR) << "open()";
     return false;
   }
 
   *master_fd = master.Pass();
   *slave_fd = slave.Pass();
   return true;
 }
 
 }  // namespace native_support