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* 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.
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* Convenience function to catch expected signals during an operation.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <hurd/signal.h>
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#include <hurd/sigpreempt.h>
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#include <string.h>
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#include <assert.h>
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error_t
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hurd_catch_signal (sigset_t sigset,
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unsigned long int first, unsigned long int last,
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error_t (*operate) (struct hurd_signal_preempter *),
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sighandler_t handler)
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{
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jmp_buf buf;
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void throw (int signo, long int sigcode, struct sigcontext *scp)
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{ longjmp (buf, scp->sc_error ?: EGRATUITOUS); }
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struct hurd_signal_preempter preempter =
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{
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sigset, first, last,
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NULL, handler == SIG_ERR ? (sighandler_t) &throw : handler,
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};
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struct hurd_sigstate *const ss = _hurd_self_sigstate ();
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error_t error;
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if (handler == SIG_ERR)
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/* Not our handler; don't bother saving state. */
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error = 0;
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else
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/* This returns again with nonzero value when we preempt a signal. */
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error = setjmp (buf);
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if (error == 0)
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{
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/* Install a signal preempter for the thread. */
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__spin_lock (&ss->lock);
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preempter.next = ss->preempters;
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ss->preempters = &preempter;
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__spin_unlock (&ss->lock);
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/* Try the operation that might crash. */
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(*operate) (&preempter);
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}
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/* Either FUNCTION completed happily and ERROR is still zero, or it hit
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an expected signal and `throw' made setjmp return the signal error
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code in ERROR. Now we can remove the preempter and return. */
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__spin_lock (&ss->lock);
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assert (ss->preempters == &preempter);
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ss->preempters = preempter.next;
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__spin_unlock (&ss->lock);
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return error;
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}
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error_t
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hurd_safe_memset (void *dest, int byte, size_t nbytes)
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{
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error_t operate (struct hurd_signal_preempter *preempter)
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{
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memset (dest, byte, nbytes);
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return 0;
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}
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return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
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(vm_address_t) dest, (vm_address_t) dest + nbytes,
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&operate, SIG_ERR);
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}
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