Allow dumpcap to write to a named pipe.

We didn't actually bother *opening* the named pipe if it wasn't named
"-" (meaning "use standard output").  Hilarity^WRandom failure behavior
ensued.

Change-Id: If73cea232b13de664630d587167167ef53a95cba
Reviewed-on: https://code.wireshark.org/review/24454
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 5 insertions, 0 deletions

diff --git a/dumpcap.c b/dumpcap.c
index cc420bae49..f73d60e92e 100644
--- a/dumpcap.c
+++ b/dumpcap.c
@@ -2852,6 +2852,11 @@ capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
                 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF)  */
                 _setmode(1, O_BINARY);
 #endif
+            } else {
+                /* Try to open the specified FIFO for use as a capture buffer.
+                   Do *not* create it if it doesn't exist.  There's nothing
+                   to truncate. If we need to read it, We Have A Problem. */
+                *save_file_fd = ws_open(capfile_name, O_WRONLY|O_BINARY, 0);
             }
         } /* if (...output_to_pipe ... */