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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93 34 * $FreeBSD$ 35 */ 36 37 #ifndef _SYS_SIGIO_H_ 38 #define _SYS_SIGIO_H_ 39 40 /* 41 * This structure holds the information needed to send a SIGIO or 42 * a SIGURG signal to a process or process group when new data arrives 43 * on a device or socket. The structure is placed on an SLIST belonging 44 * to the proc or pgrp so that the entire list may be revoked when the 45 * process exits or the process group disappears. 46 * 47 * (c) const 48 * (pg) locked by either the process or process group lock 49 */ 50 struct sigio { 51 union { 52 struct proc *siu_proc; /* (c) process to receive SIGIO/SIGURG */ 53 struct pgrp *siu_pgrp; /* (c) process group to receive ... */ 54 } sio_u; 55 SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */ 56 struct sigio **sio_myref; /* (c) location of the pointer that holds 57 * the reference to this structure */ 58 struct ucred *sio_ucred; /* (c) current credentials */ 59 pid_t sio_pgid; /* (c) pgid for signals */ 60 }; 61 #define sio_proc sio_u.siu_proc 62 #define sio_pgrp sio_u.siu_pgrp 63 64 SLIST_HEAD(sigiolst, sigio); 65 66 pid_t fgetown(struct sigio **sigiop); 67 int fsetown(pid_t pgid, struct sigio **sigiop); 68 void funsetown(struct sigio **sigiop); 69 void funsetownlst(struct sigiolst *sigiolst); 70 71 #endif /* _SYS_SIGIO_H_ */ 72