mirror of
https://github.com/MidnightCommander/mc
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115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/*
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Internal stuff of the terminal controlling library.
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Copyright (C) 2019
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Free Software Foundation, Inc.
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Written by:
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Andrew Borodin <aborodin@vmail.ru>, 2019.
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This file is part of the Midnight Commander.
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The Midnight Commander is free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the License,
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or (at your option) any later version.
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The Midnight Commander 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* \brief Source: internal stuff of the terminal controlling library.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "lib/global.h"
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#include "tty-internal.h"
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/*** global variables ****************************************************************************/
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/* pipe to handle SIGWINCH */
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int sigwinch_pipe[2];
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/*** file scope macro definitions ****************************************************************/
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/* some OSes don't provide O_CLOEXEC */
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#if !defined O_CLOEXEC && defined O_NOINHERIT
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/* Mingw spells it 'O_NOINHERIT'. */
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#define O_CLOEXEC O_NOINHERIT
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#endif
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#ifndef O_CLOEXEC
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#define O_CLOEXEC 0
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#endif
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/*** global variables ****************************************************************************/
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/*** file scope type declarations ****************************************************************/
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/*** file scope variables ************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/*** file scope functions ************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/* --------------------------------------------------------------------------------------------- */
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/*** public functions ****************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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void
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tty_create_winch_pipe (void)
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{
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int fd_flags;
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if (pipe (sigwinch_pipe) == -1)
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{
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perror (_("Cannot create pipe for SIGWINCH"));
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exit (EXIT_FAILURE);
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}
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/* If we read from an empty pipe, then read(2) will block until data is available.
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* If we write to a full pipe, then write(2) blocks until sufficient data has been read
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* from the pipe to allow the write to complete..
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* Therefore, use nonblocking I/O.
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*/
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fd_flags = fcntl (sigwinch_pipe[0], F_GETFL, NULL);
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if (fd_flags != -1)
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{
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fd_flags |= O_NONBLOCK | O_CLOEXEC;
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fd_flags = fcntl (sigwinch_pipe[0], F_SETFL, fd_flags);
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}
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if (fd_flags == -1)
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{
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perror (_("Cannot configure write end of SIGWINCH pipe"));
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exit (EXIT_FAILURE);
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}
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fd_flags = fcntl (sigwinch_pipe[1], F_GETFL, NULL);
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if (fd_flags != -1)
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{
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fd_flags |= O_NONBLOCK | O_CLOEXEC;
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fd_flags = fcntl (sigwinch_pipe[1], F_SETFL, fd_flags);
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}
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if (fd_flags == -1)
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{
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perror (_("Cannot configure read end of SIGWINCH pipe"));
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exit (EXIT_FAILURE);
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}
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}
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/* --------------------------------------------------------------------------------------------- */
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