96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
/* $OpenBSD: sigio.h,v 1.4 2020/01/08 16:27:42 visa Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)filedesc.h 8.1 (Berkeley) 6/2/93
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* $FreeBSD: head/sys/sys/sigio.h 326023 2017-11-20 19:43:44Z pfg $
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*/
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#ifndef _SYS_SIGIO_H_
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#define _SYS_SIGIO_H_
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struct sigio;
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LIST_HEAD(sigiolst, sigio);
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/*
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* sigio registration
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*
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* Locking:
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* S sigio_lock
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*/
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struct sigio_ref {
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struct sigio *sir_sigio; /* [S] associated sigio struct */
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};
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#ifdef _KERNEL
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/*
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* This structure holds the information needed to send a SIGIO or
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* a SIGURG signal to a process or process group when new data arrives
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* on a device or socket. The structure is placed on an LIST belonging
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* to the proc or pgrp so that the entire list may be revoked when the
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* process exits or the process group disappears.
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*
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* Locking:
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* I immutable after creation
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* S sigio_lock
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*/
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struct sigio {
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union {
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struct process *siu_proc;
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/* [I] process to receive
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* SIGIO/SIGURG */
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struct pgrp *siu_pgrp; /* [I] process group to receive ... */
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} sio_u;
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LIST_ENTRY(sigio) sio_pgsigio; /* [S] sigio's for process or group */
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struct sigio_ref *sio_myref; /* [I] location of the pointer that
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* holds the reference to
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* this structure */
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struct ucred *sio_ucred; /* [I] current credentials */
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pid_t sio_pgid; /* [I] pgid for signals */
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};
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#define sio_proc sio_u.siu_proc
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#define sio_pgrp sio_u.siu_pgrp
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static inline void
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sigio_init(struct sigio_ref *sir)
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{
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sir->sir_sigio = NULL;
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}
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void sigio_copy(struct sigio_ref *, struct sigio_ref *);
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void sigio_free(struct sigio_ref *);
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void sigio_freelist(struct sigiolst *);
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void sigio_getown(struct sigio_ref *, u_long, caddr_t);
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int sigio_setown(struct sigio_ref *, u_long, caddr_t);
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#endif /* _KERNEL */
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#endif /* _SYS_SIGIO_H_ */
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