1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
21 #include <hurd/signal.h>
24 /* Change the set of blocked signals to SET,
25 wait until a signal arrives, and restore the set of blocked signals. */
26 /* XXX should be __sigsuspend ? */
31 struct hurd_sigstate
*ss
;
32 sigset_t newmask
, oldmask
, pending
;
34 mach_msg_header_t msg
;
37 /* Crash before locking. */
40 /* Get a fresh port we will wait on. */
41 wait
= __mach_reply_port ();
43 ss
= _hurd_self_sigstate ();
45 __spin_lock (&ss
->lock
);
47 oldmask
= ss
->blocked
;
49 /* Change to the new blocked signal mask. */
50 ss
->blocked
= newmask
& ~_SIG_CANT_MASK
;
52 /* Notice if any pending signals just became unblocked. */
53 pending
= ss
->pending
& ~ss
->blocked
;
55 /* Tell the signal thread to message us when a signal arrives. */
57 __spin_unlock (&ss
->lock
);
60 /* Tell the signal thread to check for pending signals. */
61 __msg_sig_post (_hurd_msgport
, 0, 0, __mach_task_self ());
63 /* Wait for the signal thread's message. */
64 __mach_msg (&msg
, MACH_RCV_MSG
, 0, sizeof (msg
), wait
,
65 MACH_MSG_TIMEOUT_NONE
, MACH_PORT_NULL
);
66 __mach_port_destroy (__mach_task_self (), wait
);
68 __spin_lock (&ss
->lock
);
69 ss
->blocked
= oldmask
; /* Restore the old mask. */
70 pending
= ss
->pending
& ~ss
->blocked
; /* Again check for pending signals. */
71 __spin_unlock (&ss
->lock
);
74 /* Tell the signal thread to check for pending signals. */
75 __msg_sig_post (_hurd_msgport
, 0, 0, __mach_task_self ());
77 /* We've been interrupted! And a good thing, too.
78 Otherwise we'd never return.
79 That's right; this function always returns an error. */