1 /* Copyright (C) 1991-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 #include <hurd/signal.h>
23 #include <sysdep-cancel.h>
25 /* Change the set of blocked signals to SET,
26 wait until a signal arrives, and restore the set of blocked signals. */
28 __sigsuspend (const sigset_t
*set
)
30 struct hurd_sigstate
*ss
;
31 sigset_t newmask
, oldmask
, pending
;
33 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 _hurd_sigstate_lock (ss
);
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
= _hurd_sigstate_pending (ss
) & ~ss
->blocked
;
55 /* Tell the signal thread to message us when a signal arrives. */
57 _hurd_sigstate_unlock (ss
);
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. */
65 cancel_oldtype
= LIBC_CANCEL_ASYNC();
66 __mach_msg (&msg
, MACH_RCV_MSG
, 0, sizeof (msg
), wait
,
67 MACH_MSG_TIMEOUT_NONE
, MACH_PORT_NULL
);
68 LIBC_CANCEL_RESET (cancel_oldtype
);
69 __mach_port_destroy (__mach_task_self (), wait
);
71 /* Restore the old mask and check for pending signals again. */
72 _hurd_sigstate_lock (ss
);
73 ss
->blocked
= oldmask
;
74 pending
= _hurd_sigstate_pending(ss
) & ~ss
->blocked
;
75 _hurd_sigstate_unlock (ss
);
78 /* Tell the signal thread to check for pending signals. */
79 __msg_sig_post (_hurd_msgport
, 0, 0, __mach_task_self ());
81 /* We've been interrupted! And a good thing, too.
82 Otherwise we'd never return.
83 That's right; this function always returns an error. */
84 return __hurd_fail (EINTR
);
86 libc_hidden_def (__sigsuspend
)
87 weak_alias (__sigsuspend
, sigsuspend
)