1/* $OpenBSD: sigio.h,v 1.4 2020/01/08 16:27:42 visa Exp $ */ 2 3/*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93 32 * $FreeBSD: head/sys/sys/sigio.h 326023 2017-11-20 19:43:44Z pfg $ 33 */ 34 35#ifndef _SYS_SIGIO_H_ 36#define _SYS_SIGIO_H_ 37 38struct sigio; 39LIST_HEAD(sigiolst, sigio); 40 41/* 42 * sigio registration 43 * 44 * Locking: 45 * S sigio_lock 46 */ 47struct sigio_ref { 48 struct sigio *sir_sigio; /* [S] associated sigio struct */ 49}; 50 51#ifdef _KERNEL 52 53/* 54 * This structure holds the information needed to send a SIGIO or 55 * a SIGURG signal to a process or process group when new data arrives 56 * on a device or socket. The structure is placed on an LIST belonging 57 * to the proc or pgrp so that the entire list may be revoked when the 58 * process exits or the process group disappears. 59 * 60 * Locking: 61 * I immutable after creation 62 * S sigio_lock 63 */ 64struct sigio { 65 union { 66 struct process *siu_proc; 67 /* [I] process to receive 68 * SIGIO/SIGURG */ 69 struct pgrp *siu_pgrp; /* [I] process group to receive ... */ 70 } sio_u; 71 LIST_ENTRY(sigio) sio_pgsigio; /* [S] sigio's for process or group */ 72 struct sigio_ref *sio_myref; /* [I] location of the pointer that 73 * holds the reference to 74 * this structure */ 75 struct ucred *sio_ucred; /* [I] current credentials */ 76 pid_t sio_pgid; /* [I] pgid for signals */ 77}; 78#define sio_proc sio_u.siu_proc 79#define sio_pgrp sio_u.siu_pgrp 80 81static inline void 82sigio_init(struct sigio_ref *sir) 83{ 84 sir->sir_sigio = NULL; 85} 86 87void sigio_copy(struct sigio_ref *, struct sigio_ref *); 88void sigio_free(struct sigio_ref *); 89void sigio_freelist(struct sigiolst *); 90void sigio_getown(struct sigio_ref *, u_long, caddr_t); 91int sigio_setown(struct sigio_ref *, u_long, caddr_t); 92 93#endif /* _KERNEL */ 94 95#endif /* _SYS_SIGIO_H_ */ 96