/* glib-unixprivate.h - Unix specific integration private functions

 *

 * SPDX-License-Identifier: LGPL-2.1-or-later

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#ifndef __G_UNIXPRIVATE_H__

#define __G_UNIXPRIVATE_H__

#include "config.h"

#ifndef G_OS_UNIX

#error "This header may only be used on UNIX"

#endif

/* To make bionic export pipe2() */

#ifndef _GNU_SOURCE

#define _GNU_SOURCE 1

#endif

#include "gmacros.h"

#include "gtypes.h"

#include <errno.h>

#include <fcntl.h>

#include <unistd.h>

G_BEGIN_DECLS

static inline gboolean

g_unix_open_pipe_internal (int *fds,

                           gboolean close_on_exec,

                           gboolean nonblock)

  {

#ifdef HAVE_PIPE2

  do

    {

      int ecode;

      int flags = 0;

      if (close_on_exec)

        flags |= O_CLOEXEC;

      if (nonblock)

        flags |= O_NONBLOCK;

      /* Atomic */

      ecode = pipe2 (fds, flags);

      if (ecode == -1 && errno != ENOSYS)

        return FALSE;

      else if (ecode == 0)

        return TRUE;

      /* Fall through on -ENOSYS, we must be running on an old kernel */

    }

  while (FALSE);

#endif

  if (pipe (fds) == -1)

    return FALSE;

  if (close_on_exec)

    {

      if (fcntl (fds[0], F_SETFD, FD_CLOEXEC) == -1 ||

          fcntl (fds[1], F_SETFD, FD_CLOEXEC) == -1)

        {

          int saved_errno = errno;

          close (fds[0]);

          close (fds[1]);

          fds[0] = -1;

          fds[1] = -1;

          errno = saved_errno;

          return FALSE;

        }

    }

  if (nonblock)

    {

#ifdef O_NONBLOCK

      int flags = O_NONBLOCK;

#else

      int flags = O_NDELAY;

#endif

      if (fcntl (fds[0], F_SETFL, flags) == -1 ||

          fcntl (fds[1], F_SETFL, flags) == -1)

        {

          int saved_errno = errno;

          close (fds[0]);

          close (fds[1]);

          fds[0] = -1;

          fds[1] = -1;

          errno = saved_errno;

          return FALSE;

        }

    }

  return TRUE;

}

G_END_DECLS

#endif  /* __G_UNIXPRIVATE_H__ */