libbsd: Add a basic kqueue implementation.

It only supports file descriptors and processes (threads), and a few flags (not all) to go with them. This has been tested extensively against libuv. Change-Id: I6fc5930fa7273698172c9c695965842b5df44f03 Reviewed-on: https://review.haiku-os.org/c/haiku/+/6746 Reviewed-by: waddlesplash <[email protected]> Reviewed-by: Jérôme Duval <[email protected]>
2023-07-29 15:53:15 +00:00
parent f66d2b46a8
commit 3386b8b785
3 changed files with 384 additions and 0 deletions
@@ -0,0 +1,118 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 1999,2000,2001 Jonathan Lemon <[email protected]>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+#ifndef _BSD_SYS_EVENT_H_
+#define _BSD_SYS_EVENT_H_
+
+#include <features.h>
+
+#ifdef _DEFAULT_SOURCE
+
+#include <stdint.h>
+
+
+#define EVFILT_READ			(-1)
+#define EVFILT_WRITE		(-2)
+#define EVFILT_PROC			(-5)
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#define	EV_SET(kevp_, a, b, c, d, e, f) do {	\
+	*(kevp_) = (struct kevent){		\
+		.ident = (a),			\
+		.filter = (b),			\
+		.flags = (c),			\
+		.fflags = (d),			\
+		.data = (e),			\
+		.udata = (f),			\
+		.ext = {0},				\
+	};					\
+} while (0)
+#else /* Pre-C99 or not STDC (e.g., C++) */
+/*
+ * The definition of the local variable kevp could possibly conflict
+ * with a user-defined value passed in parameters a-f.
+ */
+#define EV_SET(kevp_, a, b, c, d, e, f) do {	\
+	struct kevent *kevp = (kevp_);		\
+	(kevp)->ident = (a);			\
+	(kevp)->filter = (b);			\
+	(kevp)->flags = (c);			\
+	(kevp)->fflags = (d);			\
+	(kevp)->data = (e);			\
+	(kevp)->udata = (f);			\
+	(kevp)->ext[0] = 0;			\
+	(kevp)->ext[1] = 0;			\
+	(kevp)->ext[2] = 0;			\
+	(kevp)->ext[3] = 0;			\
+} while (0)
+#endif
+
+struct kevent {
+	uintptr_t	ident;		/* identifier for this event */
+	short		filter;		/* filter for event */
+	unsigned short	flags;		/* action flags for kqueue */
+	unsigned int	fflags;		/* filter flag value */
+	int64_t	data;		/* filter data value */
+	void		*udata;		/* opaque user data identifier */
+	uint64_t	ext[4];		/* extensions */
+};
+
+/* actions */
+#define EV_ADD		0x0001		/* add event to kq (implies enable) */
+#define EV_DELETE	0x0002		/* delete event from kq */
+
+/* flags */
+#define EV_ONESHOT	0x0010		/* only report one occurrence */
+#define EV_CLEAR	0x0020		/* clear event state after reporting */
+
+/* returned values */
+#define EV_EOF		0x8000		/* EOF detected */
+#define EV_ERROR	0x4000		/* error, data contains errno */
+
+/* data/hint flags for EVFILT_PROC */
+#define	NOTE_EXIT	0x80000000		/* process exited */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int     kqueue(void);
+int     kevent(int kq, const struct kevent *changelist, int nchanges,
+			struct kevent *eventlist, int nevents,
+			const struct timespec *timeout);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif	/* _DEFAULT_SOURCE */
+
+#endif	/* _BSD_SYS_EVENT_H_ */