glibc/hurd/catch-signal.c
Roland McGrath fb8e70d6dd Wed Jan 3 20:23:42 1996 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* 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.
1996-01-04 10:00:22 +00:00

88 lines
2.7 KiB
C

/* 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);
}