# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1706116171 -3600
# Node ID 7260d016e8f67b69c448b35e3dd1f54f8469dffa
# Parent  39dc43aadc92236e65f711d0df1f6958bd425075
Return a NULL file pointer if a named stream capability is not available.

diff -r 39dc43aadc92 -r 7260d016e8f6 libfsclient/lib/src/client.cc
--- a/libfsclient/lib/src/client.cc	Wed Jan 24 00:12:43 2024 +0100
+++ b/libfsclient/lib/src/client.cc	Wed Jan 24 18:09:31 2024 +0100
@@ -264,11 +264,17 @@
 
 file_t *client_get_stream(const char *name, flags_t flags)
 {
-  file_t *stream = (file_t *) malloc(sizeof(file_t));
+  l4_cap_idx_t ref = l4re_env_get_cap(name);
+  file_t *stream;
+
+  if (l4_is_invalid_cap(ref))
+    return NULL;
+
+  stream = (file_t *) malloc(sizeof(file_t));
 
   file_init(stream);
   stream->flags = flags;
-  stream->ref = l4re_env_get_cap(name);
+  stream->ref = ref;
 
   /* Enforce blocking if necessary.
      NOTE: Ignoring any event subscription error. */