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authorThomas Bushnell, BSG <thomas@gnu.org>1996-11-05 05:07:48 +0000
committerThomas Bushnell, BSG <thomas@gnu.org>1996-11-05 05:07:48 +0000
commit0f110f410020b780e777de364553d0bf8d5e7ab4 (patch)
tree467074379860386c73f276ffdd594a1e2d6c7b48 /sysdeps/mach/hurd/sigwait.c
parent050a966adc1830841802dbbd803b7cc1d792af4d (diff)
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*** empty log message ***
Tue Nov 5 00:04:48 1996 Thomas Bushnell, n/BSG <thomas@gnu.ai.mit.edu> * stdio-common/vfprintf.c: Include <libc-lock.h>.
Diffstat (limited to 'sysdeps/mach/hurd/sigwait.c')
-rw-r--r--sysdeps/mach/hurd/sigwait.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/sigwait.c b/sysdeps/mach/hurd/sigwait.c
new file mode 100644
index 0000000000..b3916f83ae
--- /dev/null
+++ b/sysdeps/mach/hurd/sigwait.c
@@ -0,0 +1,136 @@
+/* Copyright (C) 1996 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 <errno.h>
+#include <hurd.h>
+#include <hurd/signal.h>
+#include <hurd/msg.h>
+#include <hurd/sigpreempt.h>
+#include <assert.h>
+
+/* Select any of pending signals from SET or wait for any to arrive. */
+int
+__sigwait (const sigset_t *set, int *sig)
+{
+ struct hurd_sigstate *ss;
+ sigset_t mask;
+ int signo = 0;
+ struct hurd_signal_preempter preempter;
+ jmp_buf buf;
+ mach_port_t wait;
+ mach_msg_header_t msg;
+
+ sighandler_t
+ preempt_fun (struct hurd_signal_preempter *pe,
+ struct hurd_sigstate *ss,
+ int *sigp,
+ struct hurd_signal_detail *detail)
+ {
+ if (signo)
+ /* We've already been run; don't interfere. */
+ return SIG_ERR;
+
+ signo = *sigp;
+
+ /* Make sure this is all kosher */
+ assert (__sigismember (&mask, signo));
+
+ /* Make sure this signal is unblocked */
+ __sigdelset (&ss->blocked, signo);
+
+ return pe->handler;
+ }
+
+ void
+ handler (int sig)
+ {
+ assert (sig == signo);
+ longjmp (buf, 1);
+ }
+
+ wait = __mach_reply_port ();
+
+ if (set != NULL)
+ /* Crash before locking */
+ mask = *set;
+
+ ss = _hurd_self_sigstate ();
+ __spin_lock (&ss->lock);
+
+ /* See if one of these signals is currently pending */
+ if (ss->pending & mask)
+ {
+ for (signo = 1; signo < NSIG; signo++)
+ if (__sigismember (&ss->pending, signo))
+ {
+ __sigdelset (&ss->pending, signo);
+ goto all_done;
+ }
+ /* Huh? Where'd it go? */
+ abort ();
+ }
+
+ /* Wait for one of them to show up */
+
+ if (!setjmp (buf))
+ {
+ /* Make the preempter */
+ preempter.signals = mask;
+ preempter.first = 0;
+ preempter.last = -1;
+ preempter.preempter = preempt_fun;
+ preempter.handler = handler;
+
+ /* Install this preempter */
+ preempter.next = ss->preempters;
+ ss->preempters = &preempter;
+
+ __spin_unlock (&ss->lock);
+
+ /* Wait. */
+ __mach_msg (&msg, MACH_RCV_MSG, 0, sizeof (msg), wait,
+ MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
+ abort ();
+ }
+ else
+ {
+ assert (signo);
+
+ __spin_lock (&ss->lock);
+
+ /* Delete our preempter. */
+ assert (ss->preempters == &preempter);
+ ss->preempters = preempter.next;
+ }
+
+
+all_done:
+ /* Cause the pointless side-effect. */
+ __sigfillset (&ss->blocked);
+ for (signo = 1; signo < NSIG; signo++)
+ if (__sigismember (&mask, signo))
+ __sigdelset (&ss->blocked, signo);
+
+ spin_unlock (&ss->lock);
+
+ __mach_port_destroy (__mach_task_self (), wait);
+ *sig = signo;
+ return 0;
+}
+
+weak_alias (__sigwait, sigwait)