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