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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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cfc1be0d61
gst-play-1.0 sets STDIN to non-blocking mode to have the input characters read as soon as they arrive. However, when gst_play_kb_set_key_handler() gets called from restore_terminal() it forgets to restore the STDIN blocking status. This can result in broken behavior for cli command executed in the same terminal after gst-play-1.0 exited. It turns out that putting STDIN in non-blocking mode is not even the proper way to achieve the desired effect, instead VMIN and VTIME in struct termios should be set to 0. Let's do that, and don't mess with the STDIN blocking mode now that it's not necessary. https://bugzilla.gnome.org/show_bug.cgi?id=794591
141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* GStreamer command line playback testing utility - keyboard handling helpers
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*
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* Copyright (C) 2013 Tim-Philipp Müller <tim centricular net>
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* Copyright (C) 2013 Centricular Ltd
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gst-play-kb.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef G_OS_UNIX
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#include <unistd.h>
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#include <termios.h>
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#endif
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#include <gst/gst.h>
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/* This is all not thread-safe, but doesn't have to be really */
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#ifdef G_OS_UNIX
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static struct termios term_settings;
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static gboolean term_settings_saved = FALSE;
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static GstPlayKbFunc kb_callback;
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static gpointer kb_callback_data;
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static gulong io_watch_id;
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static gboolean
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gst_play_kb_io_cb (GIOChannel * ioc, GIOCondition cond, gpointer user_data)
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{
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GIOStatus status;
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if (cond & G_IO_IN) {
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gchar buf[16] = { 0, };
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gsize read;
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status = g_io_channel_read_chars (ioc, buf, sizeof (buf) - 1, &read, NULL);
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if (status == G_IO_STATUS_ERROR)
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return FALSE;
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if (status == G_IO_STATUS_NORMAL) {
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if (kb_callback)
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kb_callback (buf, kb_callback_data);
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}
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}
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return TRUE; /* call us again */
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}
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gboolean
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gst_play_kb_set_key_handler (GstPlayKbFunc kb_func, gpointer user_data)
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{
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GIOChannel *ioc;
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if (!isatty (STDIN_FILENO)) {
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GST_INFO ("stdin is not connected to a terminal");
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return FALSE;
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}
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if (io_watch_id > 0) {
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g_source_remove (io_watch_id);
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io_watch_id = 0;
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}
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if (kb_func == NULL && term_settings_saved) {
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/* restore terminal settings */
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if (tcsetattr (STDIN_FILENO, TCSAFLUSH, &term_settings) == 0)
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term_settings_saved = FALSE;
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else
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g_warning ("could not restore terminal attributes");
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setvbuf (stdin, NULL, _IOLBF, 0);
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}
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if (kb_func != NULL) {
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struct termios new_settings;
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if (!term_settings_saved) {
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if (tcgetattr (STDIN_FILENO, &term_settings) != 0) {
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g_warning ("could not save terminal attributes");
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return FALSE;
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}
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term_settings_saved = TRUE;
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/* Echo off, canonical mode off, extended input processing off */
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new_settings = term_settings;
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new_settings.c_lflag &= ~(ECHO | ICANON | IEXTEN);
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new_settings.c_cc[VMIN] = 0;
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new_settings.c_cc[VTIME] = 0;
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if (tcsetattr (STDIN_FILENO, TCSAFLUSH, &new_settings) != 0) {
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g_warning ("Could not set terminal state");
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return FALSE;
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}
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setvbuf (stdin, NULL, _IONBF, 0);
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}
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}
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ioc = g_io_channel_unix_new (STDIN_FILENO);
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io_watch_id = g_io_add_watch_full (ioc, G_PRIORITY_DEFAULT, G_IO_IN,
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(GIOFunc) gst_play_kb_io_cb, user_data, NULL);
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g_io_channel_unref (ioc);
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kb_callback = kb_func;
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kb_callback_data = user_data;
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return TRUE;
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}
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#else /* !G_OS_UNIX */
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gboolean
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gst_play_kb_set_key_handler (GstPlayKbFunc key_func, gpointer user_data)
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{
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GST_FIXME ("Keyboard handling for this OS needs to be implemented");
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return FALSE;
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}
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#endif /* !G_OS_UNIX */
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