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- /* _hurd_fd_write -- write to a file descriptor; handles job control et al.
- Copyright (C) 1993, 1994 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <errno.h>
- #include <unistd.h>
- #include <hurd.h>
- #include <hurd/fd.h>
-
- error_t
- _hurd_fd_write (struct hurd_fd *fd, const void *buf, size_t *nbytes)
- {
- error_t err;
- mach_msg_type_number_t wrote;
- int noctty;
- struct hurd_sigstate *ss;
-
- /* Note that __ioctl.c implements the same SIGTTOU behavior.
- Any changes here should be done there as well. */
-
- /* Don't use the ctty io port if we are blocking or ignoring SIGTTOU. */
- ss = _hurd_self_sigstate ();
- noctty = (__sigismember (&ss->blocked, SIGTTOU) ||
- ss->actions[SIGTTOU].sa_handler == SIG_IGN);
- __mutex_unlock (&ss->lock);
-
- err = HURD_FD_PORT_USE
- (fd,
- ({
- const io_t ioport = (!noctty && ctty != MACH_PORT_NULL) ? ctty : port;
- do
- {
- err = __io_write (ioport, buf, *nbytes, -1, &wrote);
- if (ioport == ctty && err == EBACKGROUND)
- {
- if (_hurd_orphaned)
- /* Our process group is orphaned, so we never generate a
- signal; we just fail. */
- err = EIO;
- else
- {
- /* Send a SIGTTOU signal to our process group. */
- err = __USEPORT (CTTYID, _hurd_sig_post (0, SIGTTOU, port));
- /* XXX what to do if error here? */
- /* At this point we should have just run the handler for
- SIGTTOU or resumed after being stopped. Now this is
- still a "system call", so check to see if we should
- restart it. */
- __mutex_lock (&ss->lock);
- if (!(ss->actions[SIGTTOU].sa_flags & SA_RESTART))
- err = EINTR;
- __mutex_unlock (&ss->lock);
- }
- }
- } while (err == EBACKGROUND);
- err;
- }));
-
- if (! err)
- *nbytes = wrote;
-
- return err;
- }
-