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(hurd_preempt_signals, hurd_unpreempt_signals): Decls removed. * hurd/hurd/sigpreempt.h: New file. * hurd/preempt-sig.c: Rewritten with new interface. * sysdeps/mach/hurd/jmp-unwind.c (_longjmp_unwind): Remove local signal preempters being unwound past. * db: New directory, 4.4 BSD db package incorporated from BSD db-1.85 release. * sysdeps/unix/sysv/linux/sys/param.h: Several new macros for BSD compatibility.
91 lines
3.8 KiB
C
91 lines
3.8 KiB
C
/* Preemption of Hurd signals before POSIX.1 semantics take over.
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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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#ifndef _HURD_SIGPREEMPT_H
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#define _HURD_SIGPREEMPT_H 1
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#include <errno.h>
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#include <signal.h> /* For sigset_t, sighandler_t, SIG_ERR. */
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struct hurd_sigstate; /* <hurd/signal.h> */
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struct hurd_signal_preempter
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{
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/* These members select which signals this structure will apply to.
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The rest of the structure is only consulted if these match. */
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sigset_t signals; /* Signals preempted. */
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unsigned long int first, last; /* Range of sigcode values preempted. */
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/* This function will be called (with SS->lock held) to decide what to
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do with the signal described. It may modify the codes of the signal
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passed. If the return value is SIG_ERR, the next matching preempter
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is tried, or the normal handling is done for the signal (which may
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have been changed by the preempter function). Otherwise, the signal
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is processed as if the return value were its handler setting. */
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sighandler_t (*preempter) (struct hurd_signal_preempter *preempter,
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struct hurd_sigstate *ss,
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int *signo, long int *sigcode, int *sigerror);
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/* If PREEMPTER is null, act as if it returned HANDLER. */
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sighandler_t handler;
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struct hurd_signal_preempter *next; /* List structure. */
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};
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#define HURD_PREEMPT_SIGNAL_P(preempter, signo, sigcode) \
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(((preempter)->signals & sigmask (signo)) && \
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(sigcode) >= (preempter)->first && (sigcode) <= (preempter)->last)
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/* Signal preempters applying to all threads; locked by _hurd_siglock. */
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extern struct hurd_signal_preempter *_hurdsig_preempters;
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extern sigset_t _hurdsig_preempted_set;
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/* The caller must initialize all members of *PREEMPTER except `next'.
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The preempter is registered on the global list. */
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void hurd_preempt_signals (struct hurd_signal_preempter *preempter);
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/* Remove a preempter registered with hurd_preempt_signals. */
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void hurd_unpreempt_signals (struct hurd_signal_preempter *preempter);
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/* Call *OPERATE and return its value. If a signal in SIGSET with a sigcode
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in the range [FIRST,LAST] arrives during the call, catch it. If HANDLER
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is a function, it handles the signal in the normal way (i.e. it should
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longjmp unless it can restart the insn on return). If it is SIG_ERR,
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hurd_catch_signal returns the sc_error value from the signal (or
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EGRATUITOUS if that is zero).
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The preempter structure is passed to *OPERATE, which may modify its
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sigcode range or functions at any time during which it is guaranteed no
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signal in SIGSET will arrive. */
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error_t 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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/* Convenience functions using `hurd_catch_signal'. */
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error_t hurd_safe_memmove (void *dest, const void *src, size_t nbytes);
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error_t hurd_safe_memset (void *dest, int byte, size_t nbytes);
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#endif /* hurd/sigpreempt.h */
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