/*
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* Copyright (C) 2006 Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>.
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* Copyright (C) 2013 Philippe Gerum <rpm@xenomai.org>.
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*
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* This 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 of the License, or (at your option) any later version.
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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#ifndef _COBALT_UAPI_SIGNAL_H
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#define _COBALT_UAPI_SIGNAL_H
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/*
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* Those are pseudo-signals only available with pthread_kill() to
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* suspend/resume/unblock threads synchronously, force them out of
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* primary mode or even demote them to the SCHED_OTHER class via the
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* low-level nucleus interface. Can't block those signals, queue them,
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* or even set them in a sigset. Those are nasty, strictly anti-POSIX
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* things; we do provide them nevertheless only because we are mean
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* people doing harmful code for no valid reason. Can't go against
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* your nature, right? Nah... (this said, don't blame us for POSIX,
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* we are not _that_ mean).
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*/
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#define SIGSUSP (SIGRTMAX + 1)
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#define SIGRESM (SIGRTMAX + 2)
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#define SIGRELS (SIGRTMAX + 3)
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#define SIGKICK (SIGRTMAX + 4)
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#define SIGDEMT (SIGRTMAX + 5)
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/*
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* Regular POSIX signals with specific handling by Xenomai.
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*/
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#define SIGSHADOW SIGWINCH
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#define sigshadow_action(code) ((code) & 0xff)
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#define sigshadow_arg(code) (((code) >> 8) & 0xff)
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#define sigshadow_int(action, arg) ((action) | ((arg) << 8))
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/* SIGSHADOW action codes. */
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#define SIGSHADOW_ACTION_HARDEN 1
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#define SIGSHADOW_ACTION_BACKTRACE 2
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#define SIGSHADOW_ACTION_HOME 3
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#define SIGSHADOW_BACKTRACE_DEPTH 16
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#define SIGDEBUG SIGXCPU
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#define sigdebug_code(si) ((si)->si_value.sival_int)
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#define sigdebug_reason(si) (sigdebug_code(si) & 0xff)
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#define sigdebug_marker 0xfccf0000
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#define sigdebug_marked(si) \
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((sigdebug_code(si) & 0xffff0000) == sigdebug_marker)
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/* Possible values of sigdebug_reason() */
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#define SIGDEBUG_UNDEFINED 0
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#define SIGDEBUG_MIGRATE_SIGNAL 1
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#define SIGDEBUG_MIGRATE_SYSCALL 2
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#define SIGDEBUG_MIGRATE_FAULT 3
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#define SIGDEBUG_MIGRATE_PRIOINV 4
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#define SIGDEBUG_NOMLOCK 5
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#define SIGDEBUG_WATCHDOG 6
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#define SIGDEBUG_RESCNT_IMBALANCE 7
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#define SIGDEBUG_LOCK_BREAK 8
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#define SIGDEBUG_MUTEX_SLEEP 9
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#define COBALT_DELAYMAX 2147483647U
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/*
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* Internal accessors to extra siginfo/sigevent fields, extending some
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* existing base field. The extra data should be grouped in a
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* dedicated struct type. The extra space is taken from the padding
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* area available from the original structure definitions.
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*
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* e.g. getting the address of the following extension to
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* _sifields._rt from siginfo_t,
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*
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* struct bar {
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* int foo;
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* };
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*
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* would be noted as:
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*
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* siginfo_t si;
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* struct bar *p = __cobalt_si_extra(&si, _rt, struct bar);
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*
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* This code is shared between kernel and user space. Proper
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* definitions of siginfo_t and sigevent_t should have been read prior
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* to including this file.
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*
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* CAUTION: this macro does not handle alignment issues for the extra
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* data. The extra type definition should take care of this.
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*/
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#ifdef __OPTIMIZE__
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extern void *__siginfo_overflow(void);
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static inline
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const void *__check_si_overflow(size_t fldsz, size_t extrasz, const void *p)
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{
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siginfo_t *si __attribute__((unused));
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if (fldsz + extrasz <= sizeof(si->_sifields))
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return p;
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return __siginfo_overflow();
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}
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#define __cobalt_si_extra(__si, __basefield, __type) \
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((__type *)__check_si_overflow(sizeof(__si->_sifields.__basefield), \
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sizeof(__type), &(__si->_sifields.__basefield) + 1))
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#else
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#define __cobalt_si_extra(__si, __basefield, __type) \
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((__type *)((&__si->_sifields.__basefield) + 1))
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#endif
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/* Same approach, this time for extending sigevent_t. */
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#ifdef __OPTIMIZE__
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extern void *__sigevent_overflow(void);
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static inline
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const void *__check_sev_overflow(size_t fldsz, size_t extrasz, const void *p)
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{
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sigevent_t *sev __attribute__((unused));
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if (fldsz + extrasz <= sizeof(sev->_sigev_un))
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return p;
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return __sigevent_overflow();
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}
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#define __cobalt_sev_extra(__sev, __basefield, __type) \
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((__type *)__check_sev_overflow(sizeof(__sev->_sigev_un.__basefield), \
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sizeof(__type), &(__sev->_sigev_un.__basefield) + 1))
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#else
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#define __cobalt_sev_extra(__sev, __basefield, __type) \
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((__type *)((&__sev->_sigev_un.__basefield) + 1))
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#endif
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#endif /* !_COBALT_UAPI_SIGNAL_H */
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