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glibc/hurd/ctty-output.c
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/* _hurd_ctty_output -- Do an output RPC and generate SIGTTOU if necessary. | |
Copyright (C) 1995-2016 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 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. | |
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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <hurd.h> | |
#include <hurd/signal.h> | |
/* Call *RPC on PORT and/or CTTY. If a call on CTTY returns EBACKGROUND, | |
generate SIGTTOU if appropriate. */ | |
error_t | |
_hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t)) | |
{ | |
if (ctty == MACH_PORT_NULL) | |
return (*rpc) (port); | |
else | |
{ | |
struct hurd_sigstate *ss = _hurd_self_sigstate (); | |
error_t err; | |
do | |
{ | |
/* Don't use the ctty io port if we are blocking or ignoring | |
SIGTTOU. We redo this check at the top of the loop in case | |
the signal handler changed the state. */ | |
__spin_lock (&ss->lock); | |
if (__sigismember (&ss->blocked, SIGTTOU) || | |
ss->actions[SIGTTOU].sa_handler == SIG_IGN) | |
err = EIO; | |
else | |
err = 0; | |
__spin_unlock (&ss->lock); | |
if (err) | |
return (*rpc) (port); | |
err = (*rpc) (ctty); | |
if (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. | |
We must remember here not to clobber ERR, since | |
the loop condition below uses it to recall that | |
we should retry after a stop. */ | |
__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. */ | |
__spin_lock (&ss->lock); | |
if (!(ss->actions[SIGTTOU].sa_flags & SA_RESTART)) | |
err = EINTR; | |
__spin_unlock (&ss->lock); | |
} | |
} | |
/* If the last RPC generated a SIGTTOU, loop to try it again. */ | |
} while (err == EBACKGROUND); | |
return err; | |
} | |
} |