FreeBSD/Linux Kernel Cross Reference
sys/sys/sigio.h
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: releng/5.1/sys/sys/sigio.h 108524 2003-01-01 01:56:19Z alfred $
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_ */
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