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term: don't enable ptmx FDM callback until Wayland window has been configured

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The way things works right now, we cannot enable the ptmx FDM callback
right away. We need to wait for the Wayland window to have been
configured.

Before the window is configured, we don't have a size, and no
grid. Thus, if we try to process ptmx data we'll crash since we have
no where to write it to.

So, registering the ptmx fd with the FDM is now delayed until we've
received the first 'configure' event from Wayland.
This commit is contained in:
Daniel Eklöf 2020-04-30 17:22:57 +02:00
parent ae5af7bb06
commit fc2e385d87
No known key found for this signature in database
GPG key ID: 5BBD4992C116573F
3 changed files with 26 additions and 4 deletions
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25
terminal.c
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@ -737,8 +737,13 @@ term_init(const struct config *conf, struct fdm *fdm, struct wayland *wayl,
goto err;
}
if (!fdm_add(fdm, ptmx, EPOLLIN, &fdm_ptmx, term) ||
!fdm_add(fdm, flash_fd, EPOLLIN, &fdm_flash, term) ||
/*
* Enable all FDM callbackes *except* ptmx - we can't do that
* until the window has been 'configured' since we don't have a
* size (and thus no grid) before then.
*/
if (!fdm_add(fdm, flash_fd, EPOLLIN, &fdm_flash, term) ||
!fdm_add(fdm, blink_fd, EPOLLIN, &fdm_blink, term) ||
!fdm_add(fdm, cursor_blink_fd, EPOLLIN, &fdm_cursor_blink, term) ||
!fdm_add(fdm, delay_lower_fd, EPOLLIN, &fdm_delayed_render, term) ||
@ -905,7 +910,7 @@ err:
return NULL;
close_fds:
fdm_del(fdm, ptmx);
close(ptmx);
fdm_del(fdm, flash_fd);
fdm_del(fdm, blink_fd);
fdm_del(fdm, cursor_blink_fd);
@ -917,6 +922,14 @@ close_fds:
return NULL;
}
void
term_window_configured(struct terminal *term)
{
/* Enable ptmx FDM callback */
assert(term->window->is_configured);
fdm_add(term->fdm, term->ptmx, EPOLLIN, &fdm_ptmx, term);
}
static bool
fdm_shutdown(struct fdm *fdm, int fd, int events, void *data)
{
@ -978,7 +991,11 @@ term_shutdown(struct terminal *term)
fdm_del(term->fdm, term->cursor_blink.fd);
fdm_del(term->fdm, term->blink.fd);
fdm_del(term->fdm, term->flash.fd);
fdm_del(term->fdm, term->ptmx);
if (term->window != NULL && term->window->is_configured)
fdm_del(term->fdm, term->ptmx);
else
close(term->ptmx);
term->render.app_sync_updates.timer_fd = -1;
term->delayed_render_timer.lower_fd = -1;