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Re: [RFA] create_file_handler thinko?
- From: Elena Zannoni <ezannoni at redhat dot com>
- To: Keith Seitz <keiths at redhat dot com>
- Cc: <gdb-patches at sources dot redhat dot com>
- Date: Mon, 13 May 2002 23:00:01 -0400
- Subject: Re: [RFA] create_file_handler thinko?
- References: <Pine.GSO.4.33.0205131451430.25762-100000@makita.cygnus.com>
Keith Seitz writes:
> Hi,
>
> According to comments in create_file_handler, calling create_file_handler
> twice with the same fd should result in only a modification of the
> parameters for the fd.
>
> However, the source doesn't read this way. This patch changes
> create_file_handler so that it behaves in a way consistent with its
> comments.
>
> Of course, if the comments are wrong, this patch is also completely
> wrong...
>
The comment is fine. I think the code and the comment got out of
synch in one of the HAVE_POLL, use_poll etc cleanups.
Please check it in.
Thanks
Elena
> Keith
>
> ChangeLog
> 2002-05-13 Keith Seitz <keiths@redhat.com>
>
> * event-loop.c (create_file_handler): Don't do anything but
> update data when we are given a fd which we are already
> monitoring.
>
> Patch (mostly whitespace)
> Index: event-loop.c
> ===================================================================
> RCS file: /cvs/src/src/gdb/event-loop.c,v
> retrieving revision 1.17
> diff -p -r1.17 event-loop.c
> *** event-loop.c 27 Nov 2001 04:15:09 -0000 1.17
> --- event-loop.c 13 May 2002 21:59:26 -0000
> *************** create_file_handler (int fd, int mask, h
> *** 494,544 ****
> file_ptr->ready_mask = 0;
> file_ptr->next_file = gdb_notifier.first_file_handler;
> gdb_notifier.first_file_handler = file_ptr;
> - }
> - file_ptr->proc = proc;
> - file_ptr->client_data = client_data;
> - file_ptr->mask = mask;
>
> ! if (use_poll)
> ! {
> #ifdef HAVE_POLL
> ! gdb_notifier.num_fds++;
> ! if (gdb_notifier.poll_fds)
> ! gdb_notifier.poll_fds =
> ! (struct pollfd *) xrealloc (gdb_notifier.poll_fds,
> ! (gdb_notifier.num_fds
> ! * sizeof (struct pollfd)));
> ! else
> ! gdb_notifier.poll_fds =
> ! (struct pollfd *) xmalloc (sizeof (struct pollfd));
> ! (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->fd = fd;
> ! (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->events = mask;
> ! (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->revents = 0;
> #else
> ! internal_error (__FILE__, __LINE__,
> ! "use_poll without HAVE_POLL");
> #endif /* HAVE_POLL */
> ! }
> ! else
> ! {
> ! if (mask & GDB_READABLE)
> ! FD_SET (fd, &gdb_notifier.check_masks[0]);
> else
> ! FD_CLR (fd, &gdb_notifier.check_masks[0]);
>
> ! if (mask & GDB_WRITABLE)
> ! FD_SET (fd, &gdb_notifier.check_masks[1]);
> ! else
> ! FD_CLR (fd, &gdb_notifier.check_masks[1]);
>
> ! if (mask & GDB_EXCEPTION)
> ! FD_SET (fd, &gdb_notifier.check_masks[2]);
> ! else
> ! FD_CLR (fd, &gdb_notifier.check_masks[2]);
>
> ! if (gdb_notifier.num_fds <= fd)
> ! gdb_notifier.num_fds = fd + 1;
> }
> }
>
> /* Remove the file descriptor FD from the list of monitored fd's:
> --- 494,545 ----
> file_ptr->ready_mask = 0;
> file_ptr->next_file = gdb_notifier.first_file_handler;
> gdb_notifier.first_file_handler = file_ptr;
>
> ! if (use_poll)
> ! {
> #ifdef HAVE_POLL
> ! gdb_notifier.num_fds++;
> ! if (gdb_notifier.poll_fds)
> ! gdb_notifier.poll_fds =
> ! (struct pollfd *) xrealloc (gdb_notifier.poll_fds,
> ! (gdb_notifier.num_fds
> ! * sizeof (struct pollfd)));
> ! else
> ! gdb_notifier.poll_fds =
> ! (struct pollfd *) xmalloc (sizeof (struct pollfd));
> ! (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->fd = fd;
> ! (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->events = mask;
> ! (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->revents = 0;
> #else
> ! internal_error (__FILE__, __LINE__,
> ! "use_poll without HAVE_POLL");
> #endif /* HAVE_POLL */
> ! }
> else
> ! {
> ! if (mask & GDB_READABLE)
> ! FD_SET (fd, &gdb_notifier.check_masks[0]);
> ! else
> ! FD_CLR (fd, &gdb_notifier.check_masks[0]);
>
> ! if (mask & GDB_WRITABLE)
> ! FD_SET (fd, &gdb_notifier.check_masks[1]);
> ! else
> ! FD_CLR (fd, &gdb_notifier.check_masks[1]);
>
> ! if (mask & GDB_EXCEPTION)
> ! FD_SET (fd, &gdb_notifier.check_masks[2]);
> ! else
> ! FD_CLR (fd, &gdb_notifier.check_masks[2]);
>
> ! if (gdb_notifier.num_fds <= fd)
> ! gdb_notifier.num_fds = fd + 1;
> ! }
> }
> +
> + file_ptr->proc = proc;
> + file_ptr->client_data = client_data;
> + file_ptr->mask = mask;
> }
>
> /* Remove the file descriptor FD from the list of monitored fd's: