Move the closes of the save file FD around:

"capture()" should ensure that it's closed before returning, but
	it was only getting closed by "wtap_dump_close()" on success, so
	close the raw FD on failure (no "wtap_dump" stream is opened on
	failure, so we just close the raw FD);

	in a "update the display as packets arrive" capture, we should
	close the FD in the parent as soon as the fork is done, before
	even testing whether the fork succeeded (and we might as well do
	the same with the write side of the sync pipe).

svn path=/trunk/; revision=1988

capture.c

@@ -1,7 +1,7 @@
 /* capture.c
  * Routines for packet capture windows
  *
- * $Id: capture.c,v 1.103 2000/05/19 19:53:48 gram Exp $
+ * $Id: capture.c,v 1.104 2000/05/19 22:37:57 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -223,12 +223,23 @@ do_capture(char *capfile_name)
       _exit(2);
     }
 
+    /* Parent process - read messages from the child process over the
+       sync pipe. */
+
+    /* Close the write side of the pipe, so that only the child has it
+       open, and thus it completely closes, and thus returns to us
+       an EOF indication, if the child closes it (either deliberately
+       or by exiting abnormally). */
+    close(sync_pipe[1]);
+
+    /* Close the save file FD, as we won't be using it - we'll be opening
+       it and reading the save file through Wiretap. */
+    close(cf.save_file_fd);
+
     if (fork_child == -1) {
       /* We couldn't even create the child process. */
       error = errno;
-      close(sync_pipe[1]);
       close(sync_pipe[0]);
-      close(cf.save_file_fd);
       unlink(cf.save_file);
       g_free(cf.save_file);
       cf.save_file = NULL;
@@ -237,12 +248,6 @@ do_capture(char *capfile_name)
       return;
     }
 
-    close(cf.save_file_fd);
-
-    /* Parent process - read messages from the child process over the
-       sync pipe. */
-    close(sync_pipe[1]);
-
     /* Read a byte count from "sync_pipe[0]", terminated with a
        colon; if the count is 0, the child process created the
        capture file and we should start reading from it, otherwise
@@ -340,7 +345,6 @@ do_capture(char *capfile_name)
   } else {
     /* Not sync mode. */
     capture_succeeded = capture();
-    close(cf.save_file_fd);
     if (quit_after_cap) {
       /* DON'T unlink the save file.  Presumably someone wants it. */
       gtk_exit(0);
@@ -880,6 +884,10 @@ capture(void)
   return TRUE;
 
 error:
+  /* We can't use the save file, and we have no wtap_dump stream
+     to close in order to close it, so close the FD directly. */
+  close(cf.save_file_fd);
+
   /* We couldn't even start the capture, so get rid of the capture
      file. */
   unlink(cf.save_file); /* silently ignore error */