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Diffstat (limited to 'sys/sys/sigio.h')
| -rw-r--r-- | sys/sys/sigio.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/sys/sys/sigio.h b/sys/sys/sigio.h new file mode 100644 index 0000000..a20f983 --- /dev/null +++ b/sys/sys/sigio.h @@ -0,0 +1,95 @@ +/* $OpenBSD: sigio.h,v 1.4 2020/01/08 16:27:42 visa Exp $ */ + +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)filedesc.h 8.1 (Berkeley) 6/2/93 + * $FreeBSD: head/sys/sys/sigio.h 326023 2017-11-20 19:43:44Z pfg $ + */ + +#ifndef _SYS_SIGIO_H_ +#define _SYS_SIGIO_H_ + +struct sigio; +LIST_HEAD(sigiolst, sigio); + +/* + * sigio registration + * + * Locking: + * S sigio_lock + */ +struct sigio_ref { + struct sigio *sir_sigio; /* [S] associated sigio struct */ +}; + +#ifdef _KERNEL + +/* + * This structure holds the information needed to send a SIGIO or + * a SIGURG signal to a process or process group when new data arrives + * on a device or socket. The structure is placed on an LIST belonging + * to the proc or pgrp so that the entire list may be revoked when the + * process exits or the process group disappears. + * + * Locking: + * I immutable after creation + * S sigio_lock + */ +struct sigio { + union { + struct process *siu_proc; + /* [I] process to receive + * SIGIO/SIGURG */ + struct pgrp *siu_pgrp; /* [I] process group to receive ... */ + } sio_u; + LIST_ENTRY(sigio) sio_pgsigio; /* [S] sigio's for process or group */ + struct sigio_ref *sio_myref; /* [I] location of the pointer that + * holds the reference to + * this structure */ + struct ucred *sio_ucred; /* [I] current credentials */ + pid_t sio_pgid; /* [I] pgid for signals */ +}; +#define sio_proc sio_u.siu_proc +#define sio_pgrp sio_u.siu_pgrp + +static inline void +sigio_init(struct sigio_ref *sir) +{ + sir->sir_sigio = NULL; +} + +void sigio_copy(struct sigio_ref *, struct sigio_ref *); +void sigio_free(struct sigio_ref *); +void sigio_freelist(struct sigiolst *); +void sigio_getown(struct sigio_ref *, u_long, caddr_t); +int sigio_setown(struct sigio_ref *, u_long, caddr_t); + +#endif /* _KERNEL */ + +#endif /* _SYS_SIGIO_H_ */ |