2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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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.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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29 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93
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.
44 * (pg) locked by either the process or process group lock
48 struct proc *siu_proc; /* (c) process to receive SIGIO/SIGURG */
49 struct pgrp *siu_pgrp; /* (c) process group to receive ... */
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 */
57 #define sio_proc sio_u.siu_proc
58 #define sio_pgrp sio_u.siu_pgrp
60 SLIST_HEAD(sigiolst, sigio);
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);
67 #endif /* _SYS_SIGIO_H_ */