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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
166 lines
4.9 KiB
C
166 lines
4.9 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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_preemptor *),
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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_preemptor preemptor =
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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 preemptor for the thread. */
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__spin_lock (&ss->lock);
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preemptor.next = ss->preemptors;
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ss->preemptors = &preemptor;
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__spin_unlock (&ss->lock);
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/* Try the operation that might crash. */
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(*operate) (&preemptor);
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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 preemptor and return. */
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__spin_lock (&ss->lock);
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assert (ss->preemptors == &preemptor);
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ss->preemptors = preemptor.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_preemptor *preemptor)
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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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error_t
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hurd_safe_copyout (void *dest, const void *src, size_t nbytes)
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{
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error_t operate (struct hurd_signal_preemptor *preemptor)
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{
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memcpy (dest, src, 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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error_t
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hurd_safe_copyin (void *dest, const void *src, size_t nbytes)
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{
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error_t operate (struct hurd_signal_preemptor *preemptor)
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{
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memcpy (dest, src, 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) src, (vm_address_t) src + nbytes,
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&operate, SIG_ERR);
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}
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error_t
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hurd_safe_memmove (void *dest, const void *src, size_t nbytes)
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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_preemptor src_preemptor =
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{
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sigmask (SIGBUS) | sigmask (SIGSEGV),
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(vm_address_t) src, (vm_address_t) src + nbytes,
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NULL, (sighandler_t) &throw,
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};
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struct hurd_signal_preemptor dest_preemptor =
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{
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sigmask (SIGBUS) | sigmask (SIGSEGV),
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(vm_address_t) dest, (vm_address_t) dest + nbytes,
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NULL, (sighandler_t) &throw,
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&src_preemptor
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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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/* 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 preemptor for the thread. */
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__spin_lock (&ss->lock);
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src_preemptor.next = ss->preemptors;
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ss->preemptors = &dest_preemptor;
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__spin_unlock (&ss->lock);
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/* Do the copy; it might fault. */
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memmove (dest, src, nbytes);
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}
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/* Either memmove 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 preemptor and return. */
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__spin_lock (&ss->lock);
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assert (ss->preemptors == &dest_preemptor);
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ss->preemptors = src_preemptor.next;
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__spin_unlock (&ss->lock);
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return error;
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}
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