aboutsummaryrefslogtreecommitdiff
path: root/hurd/catch-signal.c
diff options
context:
space:
mode:
authorRoland McGrath <roland@gnu.org>1996-01-04 10:00:22 +0000
committerRoland McGrath <roland@gnu.org>1996-01-04 10:00:22 +0000
commitfb8e70d6dd3a9c3a0e0d2713b5be3cbc9d7a6409 (patch)
treed465aa6b6c500395145dc09bc4ea448392cf1a6a /hurd/catch-signal.c
parent67f27f3a02d623331a56cddee2a56c34b3b13bd9 (diff)
downloadglibc-fb8e70d6dd3a9c3a0e0d2713b5be3cbc9d7a6409.tar
glibc-fb8e70d6dd3a9c3a0e0d2713b5be3cbc9d7a6409.tar.gz
glibc-fb8e70d6dd3a9c3a0e0d2713b5be3cbc9d7a6409.tar.bz2
glibc-fb8e70d6dd3a9c3a0e0d2713b5be3cbc9d7a6409.zip
Wed Jan 3 20:23:42 1996 Roland McGrath <roland@churchy.gnu.ai.mit.edu>cvs/libc-960104
* hurd/catch-signal.c: New file. * hurd/intr-msg.c: When restarting RPC, fetch a new reply port. * hurd/hurdsig.c: Use new hurdfault.h interface. (abort_all_rpcs): Mutate return value to EINTR in threads whose replies we will wait for. * hurd/hurdkill.c (_hurd_sig_post): When doing pgrp, make sure we do ourselves last. Wed Jan 3 19:17:10 1996 Miles Bader <miles@gnu.ai.mit.edu> * sysdeps/mach/hurd/access.c (__access): Put the uid/gid arguments to auth_makeauth() in the right order. Wed Jan 3 17:19:04 1996 Roland McGrath <roland@churchy.gnu.ai.mit.edu> * sysdeps/generic/strsep.c: Rewritten. * sysdeps/mach/hurd/fork.c: Use a different workaround for the suspended page fault deadlock kernel bug: thread_abort our signal thread first thing after proc_dostop. * sysdeps/mach/hurd/setgid.c: Rewrote gid frobnication to recognize rootness properly. * hurd/hurdsig.c: Use new signal preemption interface.
Diffstat (limited to 'hurd/catch-signal.c')
-rw-r--r--hurd/catch-signal.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/hurd/catch-signal.c b/hurd/catch-signal.c
new file mode 100644
index 0000000000..3e8ee6c7e2
--- /dev/null
+++ b/hurd/catch-signal.c
@@ -0,0 +1,87 @@
+/* Convenience function to catch expected signals during an operation.
+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 <hurd/signal.h>
+#include <hurd/sigpreempt.h>
+#include <string.h>
+#include <assert.h>
+
+error_t
+hurd_catch_signal (sigset_t sigset,
+ unsigned long int first, unsigned long int last,
+ error_t (*operate) (struct hurd_signal_preempter *),
+ sighandler_t handler)
+{
+ jmp_buf buf;
+ void throw (int signo, long int sigcode, struct sigcontext *scp)
+ { longjmp (buf, scp->sc_error ?: EGRATUITOUS); }
+
+ struct hurd_signal_preempter preempter =
+ {
+ sigset, first, last,
+ NULL, handler == SIG_ERR ? (sighandler_t) &throw : handler,
+ };
+
+ struct hurd_sigstate *const ss = _hurd_self_sigstate ();
+ error_t error;
+
+ if (handler == SIG_ERR)
+ /* Not our handler; don't bother saving state. */
+ error = 0;
+ else
+ /* This returns again with nonzero value when we preempt a signal. */
+ error = setjmp (buf);
+
+ if (error == 0)
+ {
+ /* Install a signal preempter for the thread. */
+ __spin_lock (&ss->lock);
+ preempter.next = ss->preempters;
+ ss->preempters = &preempter;
+ __spin_unlock (&ss->lock);
+
+ /* Try the operation that might crash. */
+ (*operate) (&preempter);
+ }
+
+ /* Either FUNCTION completed happily and ERROR is still zero, or it hit
+ an expected signal and `throw' made setjmp return the signal error
+ code in ERROR. Now we can remove the preempter and return. */
+
+ __spin_lock (&ss->lock);
+ assert (ss->preempters == &preempter);
+ ss->preempters = preempter.next;
+ __spin_unlock (&ss->lock);
+
+ return error;
+}
+
+
+error_t
+hurd_safe_memset (void *dest, int byte, size_t nbytes)
+{
+ error_t operate (struct hurd_signal_preempter *preempter)
+ {
+ memset (dest, byte, nbytes);
+ return 0;
+ }
+ return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
+ (vm_address_t) dest, (vm_address_t) dest + nbytes,
+ &operate, SIG_ERR);
+}