1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93 30 * $FreeBSD$ 31 */ 32 33 #ifndef _SYS_SIGIO_H_ 34 #define _SYS_SIGIO_H_ 35 36 /* 37 * This structure holds the information needed to send a SIGIO or 38 * a SIGURG signal to a process or process group when new data arrives 39 * on a device or socket. The structure is placed on an SLIST belonging 40 * to the proc or pgrp so that the entire list may be revoked when the 41 * process exits or the process group disappears. 42 * 43 * (c) const 44 * (pg) locked by either the process or process group lock 45 */ 46 struct sigio { 47 union { 48 struct proc *siu_proc; /* (c) process to receive SIGIO/SIGURG */ 49 struct pgrp *siu_pgrp; /* (c) process group to receive ... */ 50 } sio_u; 51 SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */ 52 struct sigio **sio_myref; /* (c) location of the pointer that holds 53 * the reference to this structure */ 54 struct ucred *sio_ucred; /* (c) current credentials */ 55 pid_t sio_pgid; /* (c) pgid for signals */ 56 }; 57 #define sio_proc sio_u.siu_proc 58 #define sio_pgrp sio_u.siu_pgrp 59 60 SLIST_HEAD(sigiolst, sigio); 61 62 pid_t fgetown(struct sigio **sigiop); 63 int fsetown(pid_t pgid, struct sigio **sigiop); 64 void funsetown(struct sigio **sigiop); 65 void funsetownlst(struct sigiolst *sigiolst); 66 67 #endif /* _SYS_SIGIO_H_ */ 68