1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * $FreeBSD$ 33 */ 34 35 #ifndef _SYS_SIGIO_H_ 36 #define _SYS_SIGIO_H_ 37 38 /* 39 * This structure holds the information needed to send a SIGIO or 40 * a SIGURG signal to a process or process group when new data arrives 41 * on a device or socket. The structure is placed on an SLIST belonging 42 * to the proc or pgrp so that the entire list may be revoked when the 43 * process exits or the process group disappears. 44 * 45 * (c) const 46 * (pg) locked by either the process or process group lock 47 */ 48 struct sigio { 49 union { 50 struct proc *siu_proc; /* (c) process to receive SIGIO/SIGURG */ 51 struct pgrp *siu_pgrp; /* (c) process group to receive ... */ 52 } sio_u; 53 SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */ 54 struct sigio **sio_myref; /* (c) location of the pointer that holds 55 * the reference to this structure */ 56 struct ucred *sio_ucred; /* (c) current credentials */ 57 pid_t sio_pgid; /* (c) pgid for signals */ 58 }; 59 #define sio_proc sio_u.siu_proc 60 #define sio_pgrp sio_u.siu_pgrp 61 62 SLIST_HEAD(sigiolst, sigio); 63 64 pid_t fgetown(struct sigio **sigiop); 65 int fsetown(pid_t pgid, struct sigio **sigiop); 66 void funsetown(struct sigio **sigiop); 67 void funsetownlst(struct sigiolst *sigiolst); 68 69 #endif /* _SYS_SIGIO_H_ */ 70