Move files to match FreeBSD layout

1 files changed, 1665 insertions, 0 deletions

diff --git a/freebsd/sys/kern/sys_generic.c b/freebsd/sys/kern/sys_generic.c
new file mode 100644
index 00000000..c90d632b
--- /dev/null
+++ b/freebsd/sys/kern/sys_generic.c
@@ -0,0 +1,1665 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * Copyright (c) 1982, 1986, 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * 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.
+ * 4. 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.
+ *
+ *	@(#)sys_generic.c	8.5 (Berkeley) 1/21/94
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+
+#include <freebsd/local/opt_compat.h>
+#include <freebsd/local/opt_ktrace.h>
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/sysproto.h>
+#include <freebsd/sys/filedesc.h>
+#include <freebsd/sys/filio.h>
+#include <freebsd/sys/fcntl.h>
+#include <freebsd/sys/file.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/signalvar.h>
+#include <freebsd/sys/socketvar.h>
+#include <freebsd/sys/uio.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/ktr.h>
+#include <freebsd/sys/limits.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/poll.h>
+#include <freebsd/sys/resourcevar.h>
+#include <freebsd/sys/selinfo.h>
+#include <freebsd/sys/sleepqueue.h>
+#include <freebsd/sys/syscallsubr.h>
+#include <freebsd/sys/sysctl.h>
+#include <freebsd/sys/sysent.h>
+#include <freebsd/sys/vnode.h>
+#include <freebsd/sys/bio.h>
+#ifndef __rtems__
+#include <freebsd/sys/buf.h>
+#endif
+#include <freebsd/sys/condvar.h>
+#ifdef KTRACE
+#include <freebsd/sys/ktrace.h>
+#endif
+
+#include <freebsd/security/audit/audit.h>
+
+#ifdef __rtems__
+typedef long fd_mask;
+#include <freebsd/vm/uma.h>
+#include <freebsd/sys/mutex.h>
+#include <freebsd/machine/rtems-bsd-symbols.h>
+#endif /* __rtems__ */
+
+static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer");
+static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
+#ifndef __rtems__
+MALLOC_DEFINE(M_IOV, "iov", "large iov's");
+#endif /* __rtems__ */
+
+static int	pollout(struct thread *, struct pollfd *, struct pollfd *,
+		    u_int);
+static int	pollscan(struct thread *, struct pollfd *, u_int);
+static int	pollrescan(struct thread *);
+static int	selscan(struct thread *, fd_mask **, fd_mask **, int);
+static int	selrescan(struct thread *, fd_mask **, fd_mask **);
+static void	selfdalloc(struct thread *, void *);
+static void	selfdfree(struct seltd *, struct selfd *);
+static int	dofileread(struct thread *, int, struct file *, struct uio *,
+		    off_t, int);
+static int	dofilewrite(struct thread *, int, struct file *, struct uio *,
+		    off_t, int);
+static void	doselwakeup(struct selinfo *, int);
+static void	seltdinit(struct thread *);
+static int	seltdwait(struct thread *, int);
+static void	seltdclear(struct thread *);
+
+/*
+ * One seltd per-thread allocated on demand as needed.
+ *
+ *	t - protected by st_mtx
+ * 	k - Only accessed by curthread or read-only
+ */
+struct seltd {
+	STAILQ_HEAD(, selfd)	st_selq;	/* (k) List of selfds. */
+	struct selfd		*st_free1;	/* (k) free fd for read set. */
+	struct selfd		*st_free2;	/* (k) free fd for write set. */
+	struct mtx		st_mtx;		/* Protects struct seltd */
+	struct cv		st_wait;	/* (t) Wait channel. */
+	int			st_flags;	/* (t) SELTD_ flags. */
+};
+
+#define	SELTD_PENDING	0x0001			/* We have pending events. */
+#define	SELTD_RESCAN	0x0002			/* Doing a rescan. */
+
+/*
+ * One selfd allocated per-thread per-file-descriptor.
+ *	f - protected by sf_mtx
+ */
+struct selfd {
+	STAILQ_ENTRY(selfd)	sf_link;	/* (k) fds owned by this td. */
+	TAILQ_ENTRY(selfd)	sf_threads;	/* (f) fds on this selinfo. */
+	struct selinfo		*sf_si;		/* (f) selinfo when linked. */
+	struct mtx		*sf_mtx;	/* Pointer to selinfo mtx. */
+	struct seltd		*sf_td;		/* (k) owning seltd. */
+	void			*sf_cookie;	/* (k) fd or pollfd. */
+};
+
+static uma_zone_t selfd_zone;
+static struct mtx_pool *mtxpool_select;
+
+#ifndef _SYS_SYSPROTO_H_
+struct read_args {
+	int	fd;
+	void	*buf;
+	size_t	nbyte;
+};
+#endif
+#ifndef __rtems__
+int
+read(td, uap)
+	struct thread *td;
+	struct read_args *uap;
+{
+	struct uio auio;
+	struct iovec aiov;
+	int error;
+
+	if (uap->nbyte > INT_MAX)
+		return (EINVAL);
+	aiov.iov_base = uap->buf;
+	aiov.iov_len = uap->nbyte;
+	auio.uio_iov = &aiov;
+	auio.uio_iovcnt = 1;
+	auio.uio_resid = uap->nbyte;
+	auio.uio_segflg = UIO_USERSPACE;
+	error = kern_readv(td, uap->fd, &auio);
+	return(error);
+}
+#endif
+
+/*
+ * Positioned read system call
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct pread_args {
+	int	fd;
+	void	*buf;
+	size_t	nbyte;
+	int	pad;
+	off_t	offset;
+};
+#endif
+int
+pread(td, uap)
+	struct thread *td;
+	struct pread_args *uap;
+{
+	struct uio auio;
+	struct iovec aiov;
+	int error;
+
+	if (uap->nbyte > INT_MAX)
+		return (EINVAL);
+	aiov.iov_base = uap->buf;
+	aiov.iov_len = uap->nbyte;
+	auio.uio_iov = &aiov;
+	auio.uio_iovcnt = 1;
+	auio.uio_resid = uap->nbyte;
+	auio.uio_segflg = UIO_USERSPACE;
+	error = kern_preadv(td, uap->fd, &auio, uap->offset);
+	return(error);
+}
+
+#ifndef __rtems__
+int
+freebsd6_pread(td, uap)
+	struct thread *td;
+	struct freebsd6_pread_args *uap;
+{
+	struct pread_args oargs;
+
+	oargs.fd = uap->fd;
+	oargs.buf = uap->buf;
+	oargs.nbyte = uap->nbyte;
+	oargs.offset = uap->offset;
+	return (pread(td, &oargs));
+}
+#endif /* __rtems__ */
+
+/*
+ * Scatter read system call.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct readv_args {
+	int	fd;
+	struct	iovec *iovp;
+	u_int	iovcnt;
+};
+#endif
+int
+readv(struct thread *td, struct readv_args *uap)
+{
+	struct uio *auio;
+	int error;
+
+	error = copyinuio(uap->iovp, uap->iovcnt, &auio);
+	if (error)
+		return (error);
+	error = kern_readv(td, uap->fd, auio);
+	free(auio, M_IOV);
+	return (error);
+}
+
+int
+kern_readv(struct thread *td, int fd, struct uio *auio)
+{
+	struct file *fp;
+	int error;
+
+	error = fget_read(td, fd, &fp);
+	if (error)
+		return (error);
+	error = dofileread(td, fd, fp, auio, (off_t)-1, 0);
+	fdrop(fp, td);
+	return (error);
+}
+
+/*
+ * Scatter positioned read system call.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct preadv_args {
+	int	fd;
+	struct	iovec *iovp;
+	u_int	iovcnt;
+	off_t	offset;
+};
+#endif
+int
+preadv(struct thread *td, struct preadv_args *uap)
+{
+	struct uio *auio;
+	int error;
+
+	error = copyinuio(uap->iovp, uap->iovcnt, &auio);
+	if (error)
+		return (error);
+	error = kern_preadv(td, uap->fd, auio, uap->offset);
+	free(auio, M_IOV);
+	return (error);
+}
+
+int
+kern_preadv(td, fd, auio, offset)
+	struct thread *td;
+	int fd;
+	struct uio *auio;
+	off_t offset;
+{
+	struct file *fp;
+	int error;
+
+	error = fget_read(td, fd, &fp);
+	if (error)
+		return (error);
+	if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE))
+		error = ESPIPE;
+#ifndef __rtems__
+	else if (offset < 0 && fp->f_vnode->v_type != VCHR)
+		error = EINVAL;
+#endif /* __rtems__ */
+	else
+		error = dofileread(td, fd, fp, auio, offset, FOF_OFFSET);
+	fdrop(fp, td);
+	return (error);
+}
+
+/*
+ * Common code for readv and preadv that reads data in
+ * from a file using the passed in uio, offset, and flags.
+ */
+static int
+dofileread(td, fd, fp, auio, offset, flags)
+	struct thread *td;
+	int fd;
+	struct file *fp;
+	struct uio *auio;
+	off_t offset;
+	int flags;
+{
+	ssize_t cnt;
+	int error;
+#ifdef KTRACE
+	struct uio *ktruio = NULL;
+#endif
+
+	/* Finish zero length reads right here */
+	if (auio->uio_resid == 0) {
+		td->td_retval[0] = 0;
+		return(0);
+	}
+	auio->uio_rw = UIO_READ;
+	auio->uio_offset = offset;
+	auio->uio_td = td;
+#ifdef KTRACE
+	if (KTRPOINT(td, KTR_GENIO)) 
+		ktruio = cloneuio(auio);
+#endif
+	cnt = auio->uio_resid;
+	if ((error = fo_read(fp, auio, td->td_ucred, flags, td))) {
+		if (auio->uio_resid != cnt && (error == ERESTART ||
+		    error == EINTR || error == EWOULDBLOCK))
+			error = 0;
+	}
+	cnt -= auio->uio_resid;
+#ifdef KTRACE
+	if (ktruio != NULL) {
+		ktruio->uio_resid = cnt;
+		ktrgenio(fd, UIO_READ, ktruio, error);
+	}
+#endif
+	td->td_retval[0] = cnt;
+	return (error);
+}
+
+#ifndef __rtems__
+#ifndef _SYS_SYSPROTO_H_
+struct write_args {
+	int	fd;
+	const void *buf;
+	size_t	nbyte;
+};
+#endif
+int
+write(td, uap)
+	struct thread *td;
+	struct write_args *uap;
+{
+	struct uio auio;
+	struct iovec aiov;
+	int error;
+
+	if (uap->nbyte > INT_MAX)
+		return (EINVAL);
+	aiov.iov_base = (void *)(uintptr_t)uap->buf;
+	aiov.iov_len = uap->nbyte;
+	auio.uio_iov = &aiov;
+	auio.uio_iovcnt = 1;
+	auio.uio_resid = uap->nbyte;
+	auio.uio_segflg = UIO_USERSPACE;
+	error = kern_writev(td, uap->fd, &auio);
+	return(error);
+}
+
+/*
+ * Positioned write system call.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct pwrite_args {
+	int	fd;
+	const void *buf;
+	size_t	nbyte;
+	int	pad;
+	off_t	offset;
+};
+#endif
+int
+pwrite(td, uap)
+	struct thread *td;
+	struct pwrite_args *uap;
+{
+	struct uio auio;
+	struct iovec aiov;
+	int error;
+
+	if (uap->nbyte > INT_MAX)
+		return (EINVAL);
+	aiov.iov_base = (void *)(uintptr_t)uap->buf;
+	aiov.iov_len = uap->nbyte;
+	auio.uio_iov = &aiov;
+	auio.uio_iovcnt = 1;
+	auio.uio_resid = uap->nbyte;
+	auio.uio_segflg = UIO_USERSPACE;
+	error = kern_pwritev(td, uap->fd, &auio, uap->offset);
+	return(error);
+}
+
+int
+freebsd6_pwrite(td, uap)
+	struct thread *td;
+	struct freebsd6_pwrite_args *uap;
+{
+	struct pwrite_args oargs;
+
+	oargs.fd = uap->fd;
+	oargs.buf = uap->buf;
+	oargs.nbyte = uap->nbyte;
+	oargs.offset = uap->offset;
+	return (pwrite(td, &oargs));
+}
+
+/*
+ * Gather write system call.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct writev_args {
+	int	fd;
+	struct	iovec *iovp;
+	u_int	iovcnt;
+};
+#endif
+int
+writev(struct thread *td, struct writev_args *uap)
+{
+	struct uio *auio;
+	int error;
+
+	error = copyinuio(uap->iovp, uap->iovcnt, &auio);
+	if (error)
+		return (error);
+	error = kern_writev(td, uap->fd, auio);
+	free(auio, M_IOV);
+	return (error);
+}
+
+int
+kern_writev(struct thread *td, int fd, struct uio *auio)
+{
+	struct file *fp;
+	int error;
+
+	error = fget_write(td, fd, &fp);
+	if (error)
+		return (error);
+	error = dofilewrite(td, fd, fp, auio, (off_t)-1, 0);
+	fdrop(fp, td);
+	return (error);
+}
+
+/*
+ * Gather positioned write system call.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct pwritev_args {
+	int	fd;
+	struct	iovec *iovp;
+	u_int	iovcnt;
+	off_t	offset;
+};
+#endif
+int
+pwritev(struct thread *td, struct pwritev_args *uap)
+{
+	struct uio *auio;
+	int error;
+
+	error = copyinuio(uap->iovp, uap->iovcnt, &auio);
+	if (error)
+		return (error);
+	error = kern_pwritev(td, uap->fd, auio, uap->offset);
+	free(auio, M_IOV);
+	return (error);
+}
+
+int
+kern_pwritev(td, fd, auio, offset)
+	struct thread *td;
+	struct uio *auio;
+	int fd;
+	off_t offset;
+{
+	struct file *fp;
+	int error;
+
+	error = fget_write(td, fd, &fp);
+	if (error)
+		return (error);
+	if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE))
+		error = ESPIPE;
+	else if (offset < 0 && fp->f_vnode->v_type != VCHR)
+		error = EINVAL;
+	else
+		error = dofilewrite(td, fd, fp, auio, offset, FOF_OFFSET);
+	fdrop(fp, td);
+	return (error);
+}
+
+/*
+ * Common code for writev and pwritev that writes data to
+ * a file using the passed in uio, offset, and flags.
+ */
+static int
+dofilewrite(td, fd, fp, auio, offset, flags)
+	struct thread *td;
+	int fd;
+	struct file *fp;
+	struct uio *auio;
+	off_t offset;
+	int flags;
+{
+	ssize_t cnt;
+	int error;
+#ifdef KTRACE
+	struct uio *ktruio = NULL;
+#endif
+
+	auio->uio_rw = UIO_WRITE;
+	auio->uio_td = td;
+	auio->uio_offset = offset;
+#ifdef KTRACE
+	if (KTRPOINT(td, KTR_GENIO))
+		ktruio = cloneuio(auio);
+#endif
+	cnt = auio->uio_resid;
+	if (fp->f_type == DTYPE_VNODE)
+		bwillwrite();
+	if ((error = fo_write(fp, auio, td->td_ucred, flags, td))) {
+		if (auio->uio_resid != cnt && (error == ERESTART ||
+		    error == EINTR || error == EWOULDBLOCK))
+			error = 0;
+		/* Socket layer is responsible for issuing SIGPIPE. */
+		if (fp->f_type != DTYPE_SOCKET && error == EPIPE) {
+			PROC_LOCK(td->td_proc);
+			tdksignal(td, SIGPIPE, NULL);
+			PROC_UNLOCK(td->td_proc);
+		}
+	}
+	cnt -= auio->uio_resid;
+#ifdef KTRACE
+	if (ktruio != NULL) {
+		ktruio->uio_resid = cnt;
+		ktrgenio(fd, UIO_WRITE, ktruio, error);
+	}
+#endif
+	td->td_retval[0] = cnt;
+	return (error);
+}
+
+/*
+ * Truncate a file given a file descriptor.
+ *
+ * Can't use fget_write() here, since must return EINVAL and not EBADF if the
+ * descriptor isn't writable.
+ */
+int
+kern_ftruncate(td, fd, length)
+	struct thread *td;
+	int fd;
+	off_t length;
+{
+	struct file *fp;
+	int error;
+
+	AUDIT_ARG_FD(fd);
+	if (length < 0)
+		return (EINVAL);
+	error = fget(td, fd, &fp);
+	if (error)
+		return (error);
+	AUDIT_ARG_FILE(td->td_proc, fp);
+	if (!(fp->f_flag & FWRITE)) {
+		fdrop(fp, td);
+		return (EINVAL);
+	}
+	error = fo_truncate(fp, length, td->td_ucred, td);
+	fdrop(fp, td);
+	return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct ftruncate_args {
+	int	fd;
+	int	pad;
+	off_t	length;
+};
+#endif
+int
+ftruncate(td, uap)
+	struct thread *td;
+	struct ftruncate_args *uap;
+{
+
+	return (kern_ftruncate(td, uap->fd, uap->length));
+}
+
+#if defined(COMPAT_43)
+#ifndef _SYS_SYSPROTO_H_
+struct oftruncate_args {
+	int	fd;
+	long	length;
+};
+#endif
+int
+oftruncate(td, uap)
+	struct thread *td;
+	struct oftruncate_args *uap;
+{
+
+	return (kern_ftruncate(td, uap->fd, uap->length));
+}
+#endif /* COMPAT_43 */
+
+#ifndef _SYS_SYSPROTO_H_
+struct ioctl_args {
+	int	fd;
+	u_long	com;
+	caddr_t	data;
+};
+#endif
+/* ARGSUSED */
+int
+ioctl(struct thread *td, struct ioctl_args *uap)
+{
+	u_long com;
+	int arg, error;
+	u_int size;
+	caddr_t data;
+
+	if (uap->com > 0xffffffff) {
+		printf(
+		    "WARNING pid %d (%s): ioctl sign-extension ioctl %lx\n",
+		    td->td_proc->p_pid, td->td_name, uap->com);
+		uap->com &= 0xffffffff;
+	}
+	com = uap->com;
+
+	/*
+	 * Interpret high order word to find amount of data to be
+	 * copied to/from the user's address space.
+	 */
+	size = IOCPARM_LEN(com);
+	if ((size > IOCPARM_MAX) ||
+	    ((com & (IOC_VOID  | IOC_IN | IOC_OUT)) == 0) ||
+#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
+	    ((com & IOC_OUT) && size == 0) ||
+#else
+	    ((com & (IOC_IN | IOC_OUT)) && size == 0) ||
+#endif
+	    ((com & IOC_VOID) && size > 0 && size != sizeof(int)))
+		return (ENOTTY);
+
+	if (size > 0) {
+		if (com & IOC_VOID) {
+			/* Integer argument. */
+			arg = (intptr_t)uap->data;
+			data = (void *)&arg;
+			size = 0;
+		} else
+			data = malloc((u_long)size, M_IOCTLOPS, M_WAITOK);
+	} else
+		data = (void *)&uap->data;
+	if (com & IOC_IN) {
+		error = copyin(uap->data, data, (u_int)size);
+		if (error) {
+			if (size > 0)
+				free(data, M_IOCTLOPS);
+			return (error);
+		}
+	} else if (com & IOC_OUT) {
+		/*
+		 * Zero the buffer so the user always
+		 * gets back something deterministic.
+		 */
+		bzero(data, size);
+	}
+
+	error = kern_ioctl(td, uap->fd, com, data);
+
+	if (error == 0 && (com & IOC_OUT))
+		error = copyout(data, uap->data, (u_int)size);
+
+	if (size > 0)
+		free(data, M_IOCTLOPS);
+	return (error);
+}
+
+int
+kern_ioctl(struct thread *td, int fd, u_long com, caddr_t data)
+{
+	struct file *fp;
+	struct filedesc *fdp;
+	int error;
+	int tmp;
+
+	AUDIT_ARG_FD(fd);
+	AUDIT_ARG_CMD(com);
+	if ((error = fget(td, fd, &fp)) != 0)
+		return (error);
+	if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
+		fdrop(fp, td);
+		return (EBADF);
+	}
+	fdp = td->td_proc->p_fd;
+	switch (com) {
+	case FIONCLEX:
+		FILEDESC_XLOCK(fdp);
+		fdp->fd_ofileflags[fd] &= ~UF_EXCLOSE;
+		FILEDESC_XUNLOCK(fdp);
+		goto out;
+	case FIOCLEX:
+		FILEDESC_XLOCK(fdp);
+		fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
+		FILEDESC_XUNLOCK(fdp);
+		goto out;
+	case FIONBIO:
+		if ((tmp = *(int *)data))
+			atomic_set_int(&fp->f_flag, FNONBLOCK);
+		else
+			atomic_clear_int(&fp->f_flag, FNONBLOCK);
+		data = (void *)&tmp;
+		break;
+	case FIOASYNC:
+		if ((tmp = *(int *)data))
+			atomic_set_int(&fp->f_flag, FASYNC);
+		else
+			atomic_clear_int(&fp->f_flag, FASYNC);
+		data = (void *)&tmp;
+		break;
+	}
+
+	error = fo_ioctl(fp, com, data, td->td_ucred, td);
+out:
+	fdrop(fp, td);
+	return (error);
+}
+
+int
+poll_no_poll(int events)
+{
+	/*
+	 * Return true for read/write.  If the user asked for something
+	 * special, return POLLNVAL, so that clients have a way of
+	 * determining reliably whether or not the extended
+	 * functionality is present without hard-coding knowledge
+	 * of specific filesystem implementations.
+	 */
+	if (events & ~POLLSTANDARD)
+		return (POLLNVAL);
+
+	return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
+}
+
+int
+pselect(struct thread *td, struct pselect_args *uap)
+{
+	struct timespec ts;
+	struct timeval tv, *tvp;
+	sigset_t set, *uset;
+	int error;
+
+	if (uap->ts != NULL) {
+		error = copyin(uap->ts, &ts, sizeof(ts));
+		if (error != 0)
+		    return (error);
+		TIMESPEC_TO_TIMEVAL(&tv, &ts);
+		tvp = &tv;
+	} else
+		tvp = NULL;
+	if (uap->sm != NULL) {
+		error = copyin(uap->sm, &set, sizeof(set));
+		if (error != 0)
+			return (error);
+		uset = &set;
+	} else
+		uset = NULL;
+	return (kern_pselect(td, uap->nd, uap->in, uap->ou, uap->ex, tvp,
+	    uset, NFDBITS));
+}
+
+int
+kern_pselect(struct thread *td, int nd, fd_set *in, fd_set *ou, fd_set *ex,
+    struct timeval *tvp, sigset_t *uset, int abi_nfdbits)
+{
+	int error;
+
+	if (uset != NULL) {
+		error = kern_sigprocmask(td, SIG_SETMASK, uset,
+		    &td->td_oldsigmask, 0);
+		if (error != 0)
+			return (error);
+		td->td_pflags |= TDP_OLDMASK;
+		/*
+		 * Make sure that ast() is called on return to
+		 * usermode and TDP_OLDMASK is cleared, restoring old
+		 * sigmask.
+		 */
+		thread_lock(td);
+		td->td_flags |= TDF_ASTPENDING;
+		thread_unlock(td);
+	}
+	error = kern_select(td, nd, in, ou, ex, tvp, abi_nfdbits);
+	return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct select_args {
+	int	nd;
+	fd_set	*in, *ou, *ex;
+	struct	timeval *tv;
+};
+#endif
+int
+select(struct thread *td, struct select_args *uap)
+{
+	struct timeval tv, *tvp;
+	int error;
+
+	if (uap->tv != NULL) {
+		error = copyin(uap->tv, &tv, sizeof(tv));
+		if (error)
+			return (error);
+		tvp = &tv;
+	} else
+		tvp = NULL;
+
+	return (kern_select(td, uap->nd, uap->in, uap->ou, uap->ex, tvp,
+	    NFDBITS));
+}
+
+int
+kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou,
+    fd_set *fd_ex, struct timeval *tvp, int abi_nfdbits)
+{
+	struct filedesc *fdp;
+	/*
+	 * The magic 2048 here is chosen to be just enough for FD_SETSIZE
+	 * infds with the new FD_SETSIZE of 1024, and more than enough for
+	 * FD_SETSIZE infds, outfds and exceptfds with the old FD_SETSIZE
+	 * of 256.
+	 */
+	fd_mask s_selbits[howmany(2048, NFDBITS)];
+	fd_mask *ibits[3], *obits[3], *selbits, *sbp;
+	struct timeval atv, rtv, ttv;
+	int error, timo;
+	u_int nbufbytes, ncpbytes, ncpubytes, nfdbits;
+
+	if (nd < 0)
+		return (EINVAL);
+	fdp = td->td_proc->p_fd;
+	if (nd > fdp->fd_lastfile + 1)
+		nd = fdp->fd_lastfile + 1;
+
+	/*
+	 * Allocate just enough bits for the non-null fd_sets.  Use the
+	 * preallocated auto buffer if possible.
+	 */
+	nfdbits = roundup(nd, NFDBITS);
+	ncpbytes = nfdbits / NBBY;
+	ncpubytes = roundup(nd, abi_nfdbits) / NBBY;
+	nbufbytes = 0;
+	if (fd_in != NULL)
+		nbufbytes += 2 * ncpbytes;
+	if (fd_ou != NULL)
+		nbufbytes += 2 * ncpbytes;
+	if (fd_ex != NULL)
+		nbufbytes += 2 * ncpbytes;
+	if (nbufbytes <= sizeof s_selbits)
+		selbits = &s_selbits[0];
+	else
+		selbits = malloc(nbufbytes, M_SELECT, M_WAITOK);
+
+	/*
+	 * Assign pointers into the bit buffers and fetch the input bits.
+	 * Put the output buffers together so that they can be bzeroed
+	 * together.
+	 */
+	sbp = selbits;
+#define	getbits(name, x) \
+	do {								\
+		if (name == NULL) {					\
+			ibits[x] = NULL;				\
+			obits[x] = NULL;				\
+		} else {						\
+			ibits[x] = sbp + nbufbytes / 2 / sizeof *sbp;	\
+			obits[x] = sbp;					\
+			sbp += ncpbytes / sizeof *sbp;			\
+			error = copyin(name, ibits[x], ncpubytes);	\
+			if (error != 0)					\
+				goto done;				\
+			bzero((char *)ibits[x] + ncpubytes,		\
+			    ncpbytes - ncpubytes);			\
+		}							\
+	} while (0)
+	getbits(fd_in, 0);
+	getbits(fd_ou, 1);
+	getbits(fd_ex, 2);
+#undef	getbits
+
+#if BYTE_ORDER == BIG_ENDIAN && defined(__LP64__)
+	/*
+	 * XXX: swizzle_fdset assumes that if abi_nfdbits != NFDBITS,
+	 * we are running under 32-bit emulation. This should be more
+	 * generic.
+	 */
+#define swizzle_fdset(bits)						\
+	if (abi_nfdbits != NFDBITS && bits != NULL) {			\
+		int i;							\
+		for (i = 0; i < ncpbytes / sizeof *sbp; i++)		\
+			bits[i] = (bits[i] >> 32) | (bits[i] << 32);	\
+	}
+#else
+#define swizzle_fdset(bits)
+#endif
+
+	/* Make sure the bit order makes it through an ABI transition */
+	swizzle_fdset(ibits[0]);
+	swizzle_fdset(ibits[1]);
+	swizzle_fdset(ibits[2]);
+	
+	if (nbufbytes != 0)
+		bzero(selbits, nbufbytes / 2);
+
+	if (tvp != NULL) {
+		atv = *tvp;
+		if (itimerfix(&atv)) {
+			error = EINVAL;
+			goto done;
+		}
+		getmicrouptime(&rtv);
+		timevaladd(&atv, &rtv);
+	} else {
+		atv.tv_sec = 0;
+		atv.tv_usec = 0;
+	}
+	timo = 0;
+	seltdinit(td);
+	/* Iterate until the timeout expires or descriptors become ready. */
+	for (;;) {
+		error = selscan(td, ibits, obits, nd);
+		if (error || td->td_retval[0] != 0)
+			break;
+		if (atv.tv_sec || atv.tv_usec) {
+			getmicrouptime(&rtv);
+			if (timevalcmp(&rtv, &atv, >=))
+				break;
+			ttv = atv;
+			timevalsub(&ttv, &rtv);
+			timo = ttv.tv_sec > 24 * 60 * 60 ?
+			    24 * 60 * 60 * hz : tvtohz(&ttv);
+		}
+		error = seltdwait(td, timo);
+		if (error)
+			break;
+		error = selrescan(td, ibits, obits);
+		if (error || td->td_retval[0] != 0)
+			break;
+	}
+	seltdclear(td);
+
+done:
+	/* select is not restarted after signals... */
+	if (error == ERESTART)
+		error = EINTR;
+	if (error == EWOULDBLOCK)
+		error = 0;
+
+	/* swizzle bit order back, if necessary */
+	swizzle_fdset(obits[0]);
+	swizzle_fdset(obits[1]);
+	swizzle_fdset(obits[2]);
+#undef swizzle_fdset
+
+#define	putbits(name, x) \
+	if (name && (error2 = copyout(obits[x], name, ncpubytes))) \
+		error = error2;
+	if (error == 0) {
+		int error2;
+
+		putbits(fd_in, 0);
+		putbits(fd_ou, 1);
+		putbits(fd_ex, 2);
+#undef putbits
+	}
+	if (selbits != &s_selbits[0])
+		free(selbits, M_SELECT);
+
+	return (error);
+}
+/* 
+ * Convert a select bit set to poll flags.
+ *
+ * The backend always returns POLLHUP/POLLERR if appropriate and we
+ * return this as a set bit in any set.
+ */
+static int select_flags[3] = {
+    POLLRDNORM | POLLHUP | POLLERR,
+    POLLWRNORM | POLLHUP | POLLERR,
+    POLLRDBAND | POLLERR
+};
+
+/*
+ * Compute the fo_poll flags required for a fd given by the index and
+ * bit position in the fd_mask array.
+ */
+static __inline int
+selflags(fd_mask **ibits, int idx, fd_mask bit)
+{
+	int flags;
+	int msk;
+
+	flags = 0;
+	for (msk = 0; msk < 3; msk++) {
+		if (ibits[msk] == NULL)
+			continue;
+		if ((ibits[msk][idx] & bit) == 0)
+			continue;
+		flags |= select_flags[msk];
+	}
+	return (flags);
+}
+
+/*
+ * Set the appropriate output bits given a mask of fired events and the
+ * input bits originally requested.
+ */
+static __inline int
+selsetbits(fd_mask **ibits, fd_mask **obits, int idx, fd_mask bit, int events)
+{
+	int msk;
+	int n;
+
+	n = 0;
+	for (msk = 0; msk < 3; msk++) {
+		if ((events & select_flags[msk]) == 0)
+			continue;
+		if (ibits[msk] == NULL)
+			continue;
+		if ((ibits[msk][idx] & bit) == 0)
+			continue;
+		/*
+		 * XXX Check for a duplicate set.  This can occur because a
+		 * socket calls selrecord() twice for each poll() call
+		 * resulting in two selfds per real fd.  selrescan() will
+		 * call selsetbits twice as a result.
+		 */
+		if ((obits[msk][idx] & bit) != 0)
+			continue;
+		obits[msk][idx] |= bit;
+		n++;
+	}
+
+	return (n);
+}
+
+/*
+ * Traverse the list of fds attached to this thread's seltd and check for
+ * completion.
+ */
+static int
+selrescan(struct thread *td, fd_mask **ibits, fd_mask **obits)
+{
+	struct filedesc *fdp;
+	struct selinfo *si;
+	struct seltd *stp;
+	struct selfd *sfp;
+	struct selfd *sfn;
+	struct file *fp;
+	fd_mask bit;
+	int fd, ev, n, idx;
+
+	fdp = td->td_proc->p_fd;
+	stp = td->td_sel;
+	n = 0;
+	STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn) {
+		fd = (int)(uintptr_t)sfp->sf_cookie;
+		si = sfp->sf_si;
+		selfdfree(stp, sfp);
+		/* If the selinfo wasn't cleared the event didn't fire. */
+		if (si != NULL)
+			continue;
+		if ((fp = fget_unlocked(fdp, fd)) == NULL)
+			return (EBADF);
+		idx = fd / NFDBITS;
+		bit = (fd_mask)1 << (fd % NFDBITS);
+		ev = fo_poll(fp, selflags(ibits, idx, bit), td->td_ucred, td);
+		fdrop(fp, td);
+		if (ev != 0)
+			n += selsetbits(ibits, obits, idx, bit, ev);
+	}
+	stp->st_flags = 0;
+	td->td_retval[0] = n;
+	return (0);
+}
+
+/*
+ * Perform the initial filedescriptor scan and register ourselves with
+ * each selinfo.
+ */
+static int
+selscan(td, ibits, obits, nfd)
+	struct thread *td;
+	fd_mask **ibits, **obits;
+	int nfd;
+{
+	struct filedesc *fdp;
+	struct file *fp;
+	fd_mask bit;
+	int ev, flags, end, fd;
+	int n, idx;
+
+	fdp = td->td_proc->p_fd;
+	n = 0;
+	for (idx = 0, fd = 0; fd < nfd; idx++) {
+		end = imin(fd + NFDBITS, nfd);
+		for (bit = 1; fd < end; bit <<= 1, fd++) {
+			/* Compute the list of events we're interested in. */
+			flags = selflags(ibits, idx, bit);
+			if (flags == 0)
+				continue;
+			if ((fp = fget_unlocked(fdp, fd)) == NULL)
+				return (EBADF);
+			selfdalloc(td, (void *)(uintptr_t)fd);
+			ev = fo_poll(fp, flags, td->td_ucred, td);
+			fdrop(fp, td);
+			if (ev != 0)
+				n += selsetbits(ibits, obits, idx, bit, ev);
+		}
+	}
+
+	td->td_retval[0] = n;
+	return (0);
+}
+#endif /* __rtems__ */
+
+#ifndef _SYS_SYSPROTO_H_
+struct poll_args {
+	struct pollfd *fds;
+	u_int	nfds;
+	int	timeout;
+};
+#endif
+int
+#ifdef __rtems__
+kern_poll(td, uap)
+#else
+poll(td, uap)
+#endif /* __rtems__ */
+	struct thread *td;
+	struct poll_args *uap;
+{
+	struct pollfd *bits;
+	struct pollfd smallbits[32];
+	struct timeval atv, rtv, ttv;
+	int error = 0, timo;
+	u_int nfds;
+	size_t ni;
+
+	nfds = uap->nfds;
+	if (nfds > maxfilesperproc && nfds > FD_SETSIZE) 
+		return (EINVAL);
+	ni = nfds * sizeof(struct pollfd);
+	if (ni > sizeof(smallbits))
+		bits = malloc(ni, M_TEMP, M_WAITOK);
+	else
+		bits = smallbits;
+	error = copyin(uap->fds, bits, ni);
+	if (error)
+		goto done;
+	if (uap->timeout != INFTIM) {
+		atv.tv_sec = uap->timeout / 1000;
+		atv.tv_usec = (uap->timeout % 1000) * 1000;
+		if (itimerfix(&atv)) {
+			error = EINVAL;
+			goto done;
+		}
+		getmicrouptime(&rtv);
+		timevaladd(&atv, &rtv);
+	} else {
+		atv.tv_sec = 0;
+		atv.tv_usec = 0;
+	}
+	timo = 0;
+	seltdinit(td);
+	/* Iterate until the timeout expires or descriptors become ready. */
+	for (;;) {
+		error = pollscan(td, bits, nfds);
+		if (error || td->td_retval[0] != 0)
+			break;
+		if (atv.tv_sec || atv.tv_usec) {
+			getmicrouptime(&rtv);
+			if (timevalcmp(&rtv, &atv, >=))
+				break;
+			ttv = atv;
+			timevalsub(&ttv, &rtv);
+			timo = ttv.tv_sec > 24 * 60 * 60 ?
+			    24 * 60 * 60 * hz : tvtohz(&ttv);
+		}
+		error = seltdwait(td, timo);
+		if (error)
+			break;
+		error = pollrescan(td);
+		if (error || td->td_retval[0] != 0)
+			break;
+	}
+	seltdclear(td);
+
+done:
+	/* poll is not restarted after signals... */
+	if (error == ERESTART)
+		error = EINTR;
+	if (error == EWOULDBLOCK)
+		error = 0;
+	if (error == 0) {
+		error = pollout(td, bits, uap->fds, nfds);
+		if (error)
+			goto out;
+	}
+out:
+	if (ni > sizeof(smallbits))
+		free(bits, M_TEMP);
+	return (error);
+}
+
+static int
+pollrescan(struct thread *td)
+{
+	struct seltd *stp;
+	struct selfd *sfp;
+	struct selfd *sfn;
+	struct selinfo *si;
+	struct filedesc *fdp;
+	struct file *fp;
+	struct pollfd *fd;
+	int n;
+
+	n = 0;
+	fdp = td->td_proc->p_fd;
+	stp = td->td_sel;
+	FILEDESC_SLOCK(fdp);
+	STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn) {
+		fd = (struct pollfd *)sfp->sf_cookie;
+		si = sfp->sf_si;
+		selfdfree(stp, sfp);
+		/* If the selinfo wasn't cleared the event didn't fire. */
+		if (si != NULL)
+			continue;
+		fp = fdp->fd_ofiles[fd->fd];
+		if (fp == NULL) {
+			fd->revents = POLLNVAL;
+			n++;
+			continue;
+		}
+		/*
+		 * Note: backend also returns POLLHUP and
+		 * POLLERR if appropriate.
+		 */
+		fd->revents = fo_poll(fp, fd->events, td->td_ucred, td);
+		if (fd->revents != 0)
+			n++;
+	}
+	FILEDESC_SUNLOCK(fdp);
+	stp->st_flags = 0;
+	td->td_retval[0] = n;
+	return (0);
+}
+
+
+static int
+pollout(td, fds, ufds, nfd)
+	struct thread *td;
+	struct pollfd *fds;
+	struct pollfd *ufds;
+	u_int nfd;
+{
+	int error = 0;
+	u_int i = 0;
+	u_int n = 0;
+
+	for (i = 0; i < nfd; i++) {
+		error = copyout(&fds->revents, &ufds->revents,
+		    sizeof(ufds->revents));
+		if (error)
+			return (error);
+		if (fds->revents != 0)
+			n++;
+		fds++;
+		ufds++;
+	}
+	td->td_retval[0] = n;
+	return (0);
+}
+
+static int
+pollscan(td, fds, nfd)
+	struct thread *td;
+	struct pollfd *fds;
+	u_int nfd;
+{
+	struct filedesc *fdp = td->td_proc->p_fd;
+	int i;
+	struct file *fp;
+	int n = 0;
+
+	FILEDESC_SLOCK(fdp);
+	for (i = 0; i < nfd; i++, fds++) {
+		if (fds->fd >= fdp->fd_nfiles) {
+			fds->revents = POLLNVAL;
+			n++;
+		} else if (fds->fd < 0) {
+			fds->revents = 0;
+		} else {
+			fp = fdp->fd_ofiles[fds->fd];
+			if (fp == NULL) {
+				fds->revents = POLLNVAL;
+				n++;
+			} else {
+				/*
+				 * Note: backend also returns POLLHUP and
+				 * POLLERR if appropriate.
+				 */
+				selfdalloc(td, fds);
+				fds->revents = fo_poll(fp, fds->events,
+				    td->td_ucred, td);
+				/*
+				 * POSIX requires POLLOUT to be never
+				 * set simultaneously with POLLHUP.
+				 */
+				if ((fds->revents & POLLHUP) != 0)
+					fds->revents &= ~POLLOUT;
+
+				if (fds->revents != 0)
+					n++;
+			}
+		}
+	}
+	FILEDESC_SUNLOCK(fdp);
+	td->td_retval[0] = n;
+	return (0);
+}
+
+/*
+ * OpenBSD poll system call.
+ *
+ * XXX this isn't quite a true representation..  OpenBSD uses select ops.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct openbsd_poll_args {
+	struct pollfd *fds;
+	u_int	nfds;
+	int	timeout;
+};
+#endif
+int
+openbsd_poll(td, uap)
+	register struct thread *td;
+	register struct openbsd_poll_args *uap;
+{
+#ifdef __rtems__
+	return (kern_poll(td, (struct poll_args *)uap));
+#else
+	return (poll(td, (struct poll_args *)uap));
+#endif
+}
+
+/*
+ * XXX This was created specifically to support netncp and netsmb.  This
+ * allows the caller to specify a socket to wait for events on.  It returns
+ * 0 if any events matched and an error otherwise.  There is no way to
+ * determine which events fired.
+ */
+int
+selsocket(struct socket *so, int events, struct timeval *tvp, struct thread *td)
+{
+	struct timeval atv, rtv, ttv;
+	int error, timo;
+
+	if (tvp != NULL) {
+		atv = *tvp;
+		if (itimerfix(&atv))
+			return (EINVAL);
+		getmicrouptime(&rtv);
+		timevaladd(&atv, &rtv);
+	} else {
+		atv.tv_sec = 0;
+		atv.tv_usec = 0;
+	}
+
+	timo = 0;
+	seltdinit(td);
+	/*
+	 * Iterate until the timeout expires or the socket becomes ready.
+	 */
+	for (;;) {
+		selfdalloc(td, NULL);
+		error = sopoll(so, events, NULL, td);
+		/* error here is actually the ready events. */
+		if (error)
+			return (0);
+		if (atv.tv_sec || atv.tv_usec) {
+			getmicrouptime(&rtv);
+			if (timevalcmp(&rtv, &atv, >=)) {
+				seltdclear(td);
+				return (EWOULDBLOCK);
+			}
+			ttv = atv;
+			timevalsub(&ttv, &rtv);
+			timo = ttv.tv_sec > 24 * 60 * 60 ?
+			    24 * 60 * 60 * hz : tvtohz(&ttv);
+		}
+		error = seltdwait(td, timo);
+		seltdclear(td);
+		if (error)
+			break;
+	}
+	/* XXX Duplicates ncp/smb behavior. */
+	if (error == ERESTART)
+		error = 0;
+	return (error);
+}
+
+/*
+ * Preallocate two selfds associated with 'cookie'.  Some fo_poll routines
+ * have two select sets, one for read and another for write.
+ */
+static void
+selfdalloc(struct thread *td, void *cookie)
+{
+	struct seltd *stp;
+
+	stp = td->td_sel;
+	if (stp->st_free1 == NULL)
+		stp->st_free1 = uma_zalloc(selfd_zone, M_WAITOK|M_ZERO);
+	stp->st_free1->sf_td = stp;
+	stp->st_free1->sf_cookie = cookie;
+	if (stp->st_free2 == NULL)
+		stp->st_free2 = uma_zalloc(selfd_zone, M_WAITOK|M_ZERO);
+	stp->st_free2->sf_td = stp;
+	stp->st_free2->sf_cookie = cookie;
+}
+
+static void
+selfdfree(struct seltd *stp, struct selfd *sfp)
+{
+	STAILQ_REMOVE(&stp->st_selq, sfp, selfd, sf_link);
+	mtx_lock(sfp->sf_mtx);
+	if (sfp->sf_si)
+		TAILQ_REMOVE(&sfp->sf_si->si_tdlist, sfp, sf_threads);
+	mtx_unlock(sfp->sf_mtx);
+	uma_zfree(selfd_zone, sfp);
+}
+
+/*
+ * Record a select request.
+ */
+void
+selrecord(selector, sip)
+	struct thread *selector;
+	struct selinfo *sip;
+{
+	struct selfd *sfp;
+	struct seltd *stp;
+	struct mtx *mtxp;
+
+	stp = selector->td_sel;
+	/*
+	 * Don't record when doing a rescan.
+	 */
+	if (stp->st_flags & SELTD_RESCAN)
+		return;
+	/*
+	 * Grab one of the preallocated descriptors.
+	 */
+	sfp = NULL;
+	if ((sfp = stp->st_free1) != NULL)
+		stp->st_free1 = NULL;
+	else if ((sfp = stp->st_free2) != NULL)
+		stp->st_free2 = NULL;
+	else
+		panic("selrecord: No free selfd on selq");
+	mtxp = sip->si_mtx;
+	if (mtxp == NULL)
+		mtxp = mtx_pool_find(mtxpool_select, sip);
+	/*
+	 * Initialize the sfp and queue it in the thread.
+	 */
+	sfp->sf_si = sip;
+	sfp->sf_mtx = mtxp;
+	STAILQ_INSERT_TAIL(&stp->st_selq, sfp, sf_link);
+	/*
+	 * Now that we've locked the sip, check for initialization.
+	 */
+	mtx_lock(mtxp);
+	if (sip->si_mtx == NULL) {
+		sip->si_mtx = mtxp;
+		TAILQ_INIT(&sip->si_tdlist);
+	}
+	/*
+	 * Add this thread to the list of selfds listening on this selinfo.
+	 */
+	TAILQ_INSERT_TAIL(&sip->si_tdlist, sfp, sf_threads);
+	mtx_unlock(sip->si_mtx);
+}
+
+/* Wake up a selecting thread. */
+void
+selwakeup(sip)
+	struct selinfo *sip;
+{
+	doselwakeup(sip, -1);
+}
+
+/* Wake up a selecting thread, and set its priority. */
+void
+selwakeuppri(sip, pri)
+	struct selinfo *sip;
+	int pri;
+{
+	doselwakeup(sip, pri);
+}
+
+/*
+ * Do a wakeup when a selectable event occurs.
+ */
+static void
+doselwakeup(sip, pri)
+	struct selinfo *sip;
+	int pri;
+{
+	struct selfd *sfp;
+	struct selfd *sfn;
+	struct seltd *stp;
+
+	/* If it's not initialized there can't be any waiters. */
+	if (sip->si_mtx == NULL)
+		return;
+	/*
+	 * Locking the selinfo locks all selfds associated with it.
+	 */
+	mtx_lock(sip->si_mtx);
+	TAILQ_FOREACH_SAFE(sfp, &sip->si_tdlist, sf_threads, sfn) {
+		/*
+		 * Once we remove this sfp from the list and clear the
+		 * sf_si seltdclear will know to ignore this si.
+		 */
+		TAILQ_REMOVE(&sip->si_tdlist, sfp, sf_threads);
+		sfp->sf_si = NULL;
+		stp = sfp->sf_td;
+		mtx_lock(&stp->st_mtx);
+		stp->st_flags |= SELTD_PENDING;
+		cv_broadcastpri(&stp->st_wait, pri);
+		mtx_unlock(&stp->st_mtx);
+	}
+	mtx_unlock(sip->si_mtx);
+}
+
+static void
+seltdinit(struct thread *td)
+{
+	struct seltd *stp;
+
+	if ((stp = td->td_sel) != NULL)
+		goto out;
+	td->td_sel = stp = malloc(sizeof(*stp), M_SELECT, M_WAITOK|M_ZERO);
+	mtx_init(&stp->st_mtx, "sellck", NULL, MTX_DEF);
+	cv_init(&stp->st_wait, "select");
+out:
+	stp->st_flags = 0;
+	STAILQ_INIT(&stp->st_selq);
+}
+
+static int
+seltdwait(struct thread *td, int timo)
+{
+	struct seltd *stp;
+	int error;
+
+	stp = td->td_sel;
+	/*
+	 * An event of interest may occur while we do not hold the seltd
+	 * locked so check the pending flag before we sleep.
+	 */
+	mtx_lock(&stp->st_mtx);
+	/*
+	 * Any further calls to selrecord will be a rescan.
+	 */
+	stp->st_flags |= SELTD_RESCAN;
+	if (stp->st_flags & SELTD_PENDING) {
+		mtx_unlock(&stp->st_mtx);
+		return (0);
+	}
+	if (timo > 0)
+		error = cv_timedwait_sig(&stp->st_wait, &stp->st_mtx, timo);
+	else
+		error = cv_wait_sig(&stp->st_wait, &stp->st_mtx);
+	mtx_unlock(&stp->st_mtx);
+
+	return (error);
+}
+
+void
+seltdfini(struct thread *td)
+{
+	struct seltd *stp;
+
+	stp = td->td_sel;
+	if (stp == NULL)
+		return;
+	if (stp->st_free1)
+		uma_zfree(selfd_zone, stp->st_free1);
+	if (stp->st_free2)
+		uma_zfree(selfd_zone, stp->st_free2);
+	td->td_sel = NULL;
+	free(stp, M_SELECT);
+}
+
+/*
+ * Remove the references to the thread from all of the objects we were
+ * polling.
+ */
+static void
+seltdclear(struct thread *td)
+{
+	struct seltd *stp;
+	struct selfd *sfp;
+	struct selfd *sfn;
+
+	stp = td->td_sel;
+	STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn)
+		selfdfree(stp, sfp);
+	stp->st_flags = 0;
+}
+
+static void selectinit(void *);
+SYSINIT(select, SI_SUB_SYSCALLS, SI_ORDER_ANY, selectinit, NULL);
+static void
+selectinit(void *dummy __unused)
+{
+
+	selfd_zone = uma_zcreate("selfd", sizeof(struct selfd), NULL, NULL,
+	    NULL, NULL, UMA_ALIGN_PTR, 0);
+	mtxpool_select = mtx_pool_create("select mtxpool", 128, MTX_DEF);
+}