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 * 4. 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 */
46struct 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
60SLIST_HEAD(sigiolst, sigio);
61
62pid_t	fgetown(struct sigio **sigiop);
63int	fsetown(pid_t pgid, struct sigio **sigiop);
64void	funsetown(struct sigio **sigiop);
65void	funsetownlst(struct sigiolst *sigiolst);
66
67#endif /* _SYS_SIGIO_H_ */
68