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 * 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: releng/6.4/sys/sys/sigio.h 139825 2005-01-07 02:29:27Z imp $
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_ */
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