1 | /*- |
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2 | * Copyright (c) 1990, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 4. Neither the name of the University nor the names of its contributors |
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14 | * may be used to endorse or promote products derived from this software |
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15 | * without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | * |
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29 | * @(#)filedesc.h 8.1 (Berkeley) 6/2/93 |
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30 | * $FreeBSD$ |
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31 | */ |
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32 | |
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33 | #ifndef _SYS_SIGIO_H_ |
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34 | #define _SYS_SIGIO_H_ |
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35 | |
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36 | /* |
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37 | * This structure holds the information needed to send a SIGIO or |
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38 | * a SIGURG signal to a process or process group when new data arrives |
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39 | * on a device or socket. The structure is placed on an SLIST belonging |
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40 | * to the proc or pgrp so that the entire list may be revoked when the |
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41 | * process exits or the process group disappears. |
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42 | * |
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43 | * (c) const |
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44 | * (pg) locked by either the process or process group lock |
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45 | */ |
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46 | struct sigio { |
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47 | union { |
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48 | struct proc *siu_proc; /* (c) process to receive SIGIO/SIGURG */ |
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49 | struct pgrp *siu_pgrp; /* (c) process group to receive ... */ |
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50 | } sio_u; |
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51 | SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */ |
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52 | struct sigio **sio_myref; /* (c) location of the pointer that holds |
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53 | * the reference to this structure */ |
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54 | struct ucred *sio_ucred; /* (c) current credentials */ |
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55 | pid_t sio_pgid; /* (c) pgid for signals */ |
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56 | }; |
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57 | #define sio_proc sio_u.siu_proc |
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58 | #define sio_pgrp sio_u.siu_pgrp |
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59 | |
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60 | SLIST_HEAD(sigiolst, sigio); |
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61 | |
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62 | #ifndef __rtems__ |
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63 | pid_t fgetown(struct sigio **sigiop); |
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64 | int fsetown(pid_t pgid, struct sigio **sigiop); |
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65 | void funsetown(struct sigio **sigiop); |
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66 | void funsetownlst(struct sigiolst *sigiolst); |
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67 | #elif defined(__rtems__) && defined(_KERNEL) |
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68 | static inline pid_t |
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69 | fgetown(struct sigio **sigiop) |
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70 | { |
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71 | (void) sigiop; |
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72 | |
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73 | return BSD_DEFAULT_PID; |
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74 | } |
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75 | |
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76 | static inline int |
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77 | fsetown(pid_t pgid, struct sigio **sigiop) |
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78 | { |
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79 | (void) pgid; |
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80 | (void) sigiop; |
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81 | |
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82 | return (0); |
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83 | } |
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84 | |
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85 | static inline void |
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86 | funsetown(struct sigio **sigiop) |
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87 | { |
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88 | (void) sigiop; |
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89 | } |
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90 | |
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91 | static inline void |
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92 | funsetownlst(struct sigiolst *sigiolst) |
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93 | { |
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94 | (void) sigiolst; |
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95 | } |
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96 | #endif /* __rtems__ && _KERNEL */ |
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97 | |
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98 | #endif /* _SYS_SIGIO_H_ */ |
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