aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/mach/hurd/sigsuspend.c
diff options
context:
space:
mode:
authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/mach/hurd/sigsuspend.c
downloadglibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar
glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.gz
glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.bz2
glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.zip
initial import
Diffstat (limited to 'sysdeps/mach/hurd/sigsuspend.c')
-rw-r--r--sysdeps/mach/hurd/sigsuspend.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/sigsuspend.c b/sysdeps/mach/hurd/sigsuspend.c
new file mode 100644
index 0000000000..aa0b2876a4
--- /dev/null
+++ b/sysdeps/mach/hurd/sigsuspend.c
@@ -0,0 +1,81 @@
+/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 <ansidecl.h>
+#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
+DEFUN(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, __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, __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;
+}