| /* Copyright (C) 1991-2014 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 <errno.h> |
| #include <hurd.h> |
| #include <hurd/signal.h> |
| #include <hurd/msg.h> |
| |
| /* Change the set of blocked signals to SET, |
| wait until a signal arrives, and restore the set of blocked signals. */ |
| int |
| __sigsuspend (set) |
| const sigset_t *set; |
| { |
| struct hurd_sigstate *ss; |
| sigset_t newmask, oldmask, pending; |
| mach_port_t wait; |
| mach_msg_header_t msg; |
| |
| if (set != NULL) |
| /* Crash before locking. */ |
| newmask = *set; |
| |
| /* Get a fresh port we will wait on. */ |
| wait = __mach_reply_port (); |
| |
| ss = _hurd_self_sigstate (); |
| |
| __spin_lock (&ss->lock); |
| |
| oldmask = ss->blocked; |
| if (set != NULL) |
| /* Change to the new blocked signal mask. */ |
| ss->blocked = newmask & ~_SIG_CANT_MASK; |
| |
| /* Notice if any pending signals just became unblocked. */ |
| pending = ss->pending & ~ss->blocked; |
| |
| /* Tell the signal thread to message us when a signal arrives. */ |
| ss->suspended = wait; |
| __spin_unlock (&ss->lock); |
| |
| if (pending) |
| /* Tell the signal thread to check for pending signals. */ |
| __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ()); |
| |
| /* Wait for the signal thread's message. */ |
| __mach_msg (&msg, MACH_RCV_MSG, 0, sizeof (msg), wait, |
| MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL); |
| __mach_port_destroy (__mach_task_self (), wait); |
| |
| __spin_lock (&ss->lock); |
| ss->blocked = oldmask; /* Restore the old mask. */ |
| pending = ss->pending & ~ss->blocked; /* Again check for pending signals. */ |
| __spin_unlock (&ss->lock); |
| |
| if (pending) |
| /* Tell the signal thread to check for pending signals. */ |
| __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ()); |
| |
| /* We've been interrupted! And a good thing, too. |
| Otherwise we'd never return. |
| That's right; this function always returns an error. */ |
| errno = EINTR; |
| return -1; |
| } |
| libc_hidden_def (__sigsuspend) |
| strong_alias (__sigsuspend, sigsuspend_not_cancel) |
| weak_alias (__sigsuspend, sigsuspend) |