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31 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93
39 * This structure holds the information needed to send a SIGIO or
40 * a SIGURG signal to a process or process group when new data arrives
41 * on a device or socket. The structure is placed on an SLIST belonging
42 * to the proc or pgrp so that the entire list may be revoked when the
43 * process exits or the process group disappears.
46 * (pg) locked by either the process or process group lock
50 struct proc *siu_proc; /* (c) process to receive SIGIO/SIGURG */
51 struct pgrp *siu_pgrp; /* (c) process group to receive ... */
53 SLIST_ENTRY(sigio) sio_pgsigio; /* (pg) sigio's for process or group */
54 struct sigio **sio_myref; /* (c) location of the pointer that holds
55 * the reference to this structure */
56 struct ucred *sio_ucred; /* (c) current credentials */
57 pid_t sio_pgid; /* (c) pgid for signals */
59 #define sio_proc sio_u.siu_proc
60 #define sio_pgrp sio_u.siu_pgrp
62 SLIST_HEAD(sigiolst, sigio);
64 pid_t fgetown(struct sigio **sigiop);
65 int fsetown(pid_t pgid, struct sigio **sigiop);
66 void funsetown(struct sigio **sigiop);
67 void funsetownlst(struct sigiolst *sigiolst);
69 #endif /* _SYS_SIGIO_H_ */