BSD 4.4 Lite Kernel Sources

2 files changed, 579 insertions, 0 deletions

diff --git a/sys/fs/fifofs/fifo.h b/sys/fs/fifofs/fifo.h
new file mode 100644
index 0000000..e89186d
--- /dev/null
+++ b/sys/fs/fifofs/fifo.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 1991, 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 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.
+ *
+ *	@(#)fifo.h	8.2 (Berkeley) 2/2/94
+ */
+
+#ifdef FIFO
+/*
+ * Prototypes for fifo operations on vnodes.
+ */
+int	fifo_badop(),
+	fifo_ebadf();
+
+int	fifo_lookup __P((struct vop_lookup_args *));
+#define fifo_create ((int (*) __P((struct  vop_create_args *)))fifo_badop)
+#define fifo_mknod ((int (*) __P((struct  vop_mknod_args *)))fifo_badop)
+int	fifo_open __P((struct vop_open_args *));
+int	fifo_close __P((struct vop_close_args *));
+#define fifo_access ((int (*) __P((struct  vop_access_args *)))fifo_ebadf)
+#define fifo_getattr ((int (*) __P((struct  vop_getattr_args *)))fifo_ebadf)
+#define fifo_setattr ((int (*) __P((struct  vop_setattr_args *)))fifo_ebadf)
+int	fifo_read __P((struct vop_read_args *));
+int	fifo_write __P((struct vop_write_args *));
+int	fifo_ioctl __P((struct vop_ioctl_args *));
+int	fifo_select __P((struct vop_select_args *));
+#define fifo_mmap ((int (*) __P((struct  vop_mmap_args *)))fifo_badop)
+#define fifo_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
+#define fifo_seek ((int (*) __P((struct  vop_seek_args *)))fifo_badop)
+#define fifo_remove ((int (*) __P((struct  vop_remove_args *)))fifo_badop)
+#define fifo_link ((int (*) __P((struct  vop_link_args *)))fifo_badop)
+#define fifo_rename ((int (*) __P((struct  vop_rename_args *)))fifo_badop)
+#define fifo_mkdir ((int (*) __P((struct  vop_mkdir_args *)))fifo_badop)
+#define fifo_rmdir ((int (*) __P((struct  vop_rmdir_args *)))fifo_badop)
+#define fifo_symlink ((int (*) __P((struct  vop_symlink_args *)))fifo_badop)
+#define fifo_readdir ((int (*) __P((struct  vop_readdir_args *)))fifo_badop)
+#define fifo_readlink ((int (*) __P((struct  vop_readlink_args *)))fifo_badop)
+#define fifo_abortop ((int (*) __P((struct  vop_abortop_args *)))fifo_badop)
+#define fifo_inactive ((int (*) __P((struct  vop_inactive_args *)))nullop)
+#define fifo_reclaim ((int (*) __P((struct  vop_reclaim_args *)))nullop)
+int	fifo_lock __P((struct vop_lock_args *));
+int	fifo_unlock __P((struct vop_unlock_args *));
+int	fifo_bmap __P((struct vop_bmap_args *));
+#define fifo_strategy ((int (*) __P((struct  vop_strategy_args *)))fifo_badop)
+int	fifo_print __P((struct vop_print_args *));
+#define fifo_islocked ((int (*) __P((struct  vop_islocked_args *)))nullop)
+int	fifo_pathconf __P((struct vop_pathconf_args *));
+int	fifo_advlock __P((struct vop_advlock_args *));
+#define fifo_blkatoff ((int (*) __P((struct  vop_blkatoff_args *)))fifo_badop)
+#define fifo_valloc ((int (*) __P((struct  vop_valloc_args *)))fifo_badop)
+#define fifo_reallocblks \
+	((int (*) __P((struct  vop_reallocblks_args *)))fifo_badop)
+#define fifo_vfree ((int (*) __P((struct  vop_vfree_args *)))fifo_badop)
+#define fifo_truncate ((int (*) __P((struct  vop_truncate_args *)))nullop)
+#define fifo_update ((int (*) __P((struct  vop_update_args *)))nullop)
+#define fifo_bwrite ((int (*) __P((struct  vop_bwrite_args *)))nullop)
+#endif /* FIFO */
diff --git a/sys/fs/fifofs/fifo_vnops.c b/sys/fs/fifofs/fifo_vnops.c
new file mode 100644
index 0000000..bad33a4
--- /dev/null
+++ b/sys/fs/fifofs/fifo_vnops.c
@@ -0,0 +1,494 @@
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 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.
+ *
+ *	@(#)fifo_vnops.c	8.2 (Berkeley) 1/4/94
+ */
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/time.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/stat.h>
+#include <sys/systm.h>
+#include <sys/ioctl.h>
+#include <sys/file.h>
+#include <sys/errno.h>
+#include <sys/malloc.h>
+#include <miscfs/fifofs/fifo.h>
+
+/*
+ * This structure is associated with the FIFO vnode and stores
+ * the state associated with the FIFO.
+ */
+struct fifoinfo {
+	struct socket	*fi_readsock;
+	struct socket	*fi_writesock;
+	long		fi_readers;
+	long		fi_writers;
+};
+
+int (**fifo_vnodeop_p)();
+struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
+	{ &vop_default_desc, vn_default_error },
+	{ &vop_lookup_desc, fifo_lookup },		/* lookup */
+	{ &vop_create_desc, fifo_create },		/* create */
+	{ &vop_mknod_desc, fifo_mknod },		/* mknod */
+	{ &vop_open_desc, fifo_open },			/* open */
+	{ &vop_close_desc, fifo_close },		/* close */
+	{ &vop_access_desc, fifo_access },		/* access */
+	{ &vop_getattr_desc, fifo_getattr },		/* getattr */
+	{ &vop_setattr_desc, fifo_setattr },		/* setattr */
+	{ &vop_read_desc, fifo_read },			/* read */
+	{ &vop_write_desc, fifo_write },		/* write */
+	{ &vop_ioctl_desc, fifo_ioctl },		/* ioctl */
+	{ &vop_select_desc, fifo_select },		/* select */
+	{ &vop_mmap_desc, fifo_mmap },			/* mmap */
+	{ &vop_fsync_desc, fifo_fsync },		/* fsync */
+	{ &vop_seek_desc, fifo_seek },			/* seek */
+	{ &vop_remove_desc, fifo_remove },		/* remove */
+	{ &vop_link_desc, fifo_link },			/* link */
+	{ &vop_rename_desc, fifo_rename },		/* rename */
+	{ &vop_mkdir_desc, fifo_mkdir },		/* mkdir */
+	{ &vop_rmdir_desc, fifo_rmdir },		/* rmdir */
+	{ &vop_symlink_desc, fifo_symlink },		/* symlink */
+	{ &vop_readdir_desc, fifo_readdir },		/* readdir */
+	{ &vop_readlink_desc, fifo_readlink },		/* readlink */
+	{ &vop_abortop_desc, fifo_abortop },		/* abortop */
+	{ &vop_inactive_desc, fifo_inactive },		/* inactive */
+	{ &vop_reclaim_desc, fifo_reclaim },		/* reclaim */
+	{ &vop_lock_desc, fifo_lock },			/* lock */
+	{ &vop_unlock_desc, fifo_unlock },		/* unlock */
+	{ &vop_bmap_desc, fifo_bmap },			/* bmap */
+	{ &vop_strategy_desc, fifo_strategy },		/* strategy */
+	{ &vop_print_desc, fifo_print },		/* print */
+	{ &vop_islocked_desc, fifo_islocked },		/* islocked */
+	{ &vop_pathconf_desc, fifo_pathconf },		/* pathconf */
+	{ &vop_advlock_desc, fifo_advlock },		/* advlock */
+	{ &vop_blkatoff_desc, fifo_blkatoff },		/* blkatoff */
+	{ &vop_valloc_desc, fifo_valloc },		/* valloc */
+	{ &vop_vfree_desc, fifo_vfree },		/* vfree */
+	{ &vop_truncate_desc, fifo_truncate },		/* truncate */
+	{ &vop_update_desc, fifo_update },		/* update */
+	{ &vop_bwrite_desc, fifo_bwrite },		/* bwrite */
+	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
+};
+struct vnodeopv_desc fifo_vnodeop_opv_desc =
+	{ &fifo_vnodeop_p, fifo_vnodeop_entries };
+
+/*
+ * Trivial lookup routine that always fails.
+ */
+/* ARGSUSED */
+fifo_lookup(ap)
+	struct vop_lookup_args /* {
+		struct vnode * a_dvp;
+		struct vnode ** a_vpp;
+		struct componentname * a_cnp;
+	} */ *ap;
+{
+	
+	*ap->a_vpp = NULL;
+	return (ENOTDIR);
+}
+
+/*
+ * Open called to set up a new instance of a fifo or
+ * to find an active instance of a fifo.
+ */
+/* ARGSUSED */
+fifo_open(ap)
+	struct vop_open_args /* {
+		struct vnode *a_vp;
+		int  a_mode;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	register struct vnode *vp = ap->a_vp;
+	register struct fifoinfo *fip;
+	struct socket *rso, *wso;
+	int error;
+	static char openstr[] = "fifo";
+
+	if ((ap->a_mode & (FREAD|FWRITE)) == (FREAD|FWRITE))
+		return (EINVAL);
+	if ((fip = vp->v_fifoinfo) == NULL) {
+		MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
+		vp->v_fifoinfo = fip;
+		if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) {
+			free(fip, M_VNODE);
+			vp->v_fifoinfo = NULL;
+			return (error);
+		}
+		fip->fi_readsock = rso;
+		if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) {
+			(void)soclose(rso);
+			free(fip, M_VNODE);
+			vp->v_fifoinfo = NULL;
+			return (error);
+		}
+		fip->fi_writesock = wso;
+		if (error = unp_connect2(wso, rso)) {
+			(void)soclose(wso);
+			(void)soclose(rso);
+			free(fip, M_VNODE);
+			vp->v_fifoinfo = NULL;
+			return (error);
+		}
+		fip->fi_readers = fip->fi_writers = 0;
+		wso->so_state |= SS_CANTRCVMORE;
+		rso->so_state |= SS_CANTSENDMORE;
+	}
+	error = 0;
+	if (ap->a_mode & FREAD) {
+		fip->fi_readers++;
+		if (fip->fi_readers == 1) {
+			fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
+			if (fip->fi_writers > 0)
+				wakeup((caddr_t)&fip->fi_writers);
+		}
+		if (ap->a_mode & O_NONBLOCK)
+			return (0);
+		while (fip->fi_writers == 0) {
+			VOP_UNLOCK(vp);
+			error = tsleep((caddr_t)&fip->fi_readers,
+			    PCATCH | PSOCK, openstr, 0);
+			VOP_LOCK(vp);
+			if (error)
+				break;
+		}
+	} else {
+		fip->fi_writers++;
+		if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) {
+			error = ENXIO;
+		} else {
+			if (fip->fi_writers == 1) {
+				fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
+				if (fip->fi_readers > 0)
+					wakeup((caddr_t)&fip->fi_readers);
+			}
+			while (fip->fi_readers == 0) {
+				VOP_UNLOCK(vp);
+				error = tsleep((caddr_t)&fip->fi_writers,
+				    PCATCH | PSOCK, openstr, 0);
+				VOP_LOCK(vp);
+				if (error)
+					break;
+			}
+		}
+	}
+	if (error)
+		VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p);
+	return (error);
+}
+
+/*
+ * Vnode op for read
+ */
+/* ARGSUSED */
+fifo_read(ap)
+	struct vop_read_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int  a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap;
+{
+	register struct uio *uio = ap->a_uio;
+	register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
+	int error, startresid;
+
+#ifdef DIAGNOSTIC
+	if (uio->uio_rw != UIO_READ)
+		panic("fifo_read mode");
+#endif
+	if (uio->uio_resid == 0)
+		return (0);
+	if (ap->a_ioflag & IO_NDELAY)
+		rso->so_state |= SS_NBIO;
+	startresid = uio->uio_resid;
+	VOP_UNLOCK(ap->a_vp);
+	error = soreceive(rso, (struct mbuf **)0, uio, (int *)0,
+		(struct mbuf **)0, (struct mbuf **)0);
+	VOP_LOCK(ap->a_vp);
+	/*
+	 * Clear EOF indication after first such return.
+	 */
+	if (uio->uio_resid == startresid)
+		rso->so_state &= ~SS_CANTRCVMORE;
+	if (ap->a_ioflag & IO_NDELAY)
+		rso->so_state &= ~SS_NBIO;
+	return (error);
+}
+
+/*
+ * Vnode op for write
+ */
+/* ARGSUSED */
+fifo_write(ap)
+	struct vop_write_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int  a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap;
+{
+	struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
+	int error;
+
+#ifdef DIAGNOSTIC
+	if (ap->a_uio->uio_rw != UIO_WRITE)
+		panic("fifo_write mode");
+#endif
+	if (ap->a_ioflag & IO_NDELAY)
+		wso->so_state |= SS_NBIO;
+	VOP_UNLOCK(ap->a_vp);
+	error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0);
+	VOP_LOCK(ap->a_vp);
+	if (ap->a_ioflag & IO_NDELAY)
+		wso->so_state &= ~SS_NBIO;
+	return (error);
+}
+
+/*
+ * Device ioctl operation.
+ */
+/* ARGSUSED */
+fifo_ioctl(ap)
+	struct vop_ioctl_args /* {
+		struct vnode *a_vp;
+		int  a_command;
+		caddr_t  a_data;
+		int  a_fflag;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct file filetmp;
+
+	if (ap->a_command == FIONBIO)
+		return (0);
+	if (ap->a_fflag & FREAD)
+		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
+	else
+		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
+	return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p));
+}
+
+/* ARGSUSED */
+fifo_select(ap)
+	struct vop_select_args /* {
+		struct vnode *a_vp;
+		int  a_which;
+		int  a_fflags;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct file filetmp;
+
+	if (ap->a_fflags & FREAD)
+		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
+	else
+		filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
+	return (soo_select(&filetmp, ap->a_which, ap->a_p));
+}
+
+/*
+ * This is a noop, simply returning what one has been given.
+ */
+fifo_bmap(ap)
+	struct vop_bmap_args /* {
+		struct vnode *a_vp;
+		daddr_t  a_bn;
+		struct vnode **a_vpp;
+		daddr_t *a_bnp;
+	} */ *ap;
+{
+
+	if (ap->a_vpp != NULL)
+		*ap->a_vpp = ap->a_vp;
+	if (ap->a_bnp != NULL)
+		*ap->a_bnp = ap->a_bn;
+	return (0);
+}
+
+/*
+ * At the moment we do not do any locking.
+ */
+/* ARGSUSED */
+fifo_lock(ap)
+	struct vop_lock_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	return (0);
+}
+
+/* ARGSUSED */
+fifo_unlock(ap)
+	struct vop_unlock_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	return (0);
+}
+
+/*
+ * Device close routine
+ */
+/* ARGSUSED */
+fifo_close(ap)
+	struct vop_close_args /* {
+		struct vnode *a_vp;
+		int  a_fflag;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	register struct vnode *vp = ap->a_vp;
+	register struct fifoinfo *fip = vp->v_fifoinfo;
+	int error1, error2;
+
+	if (ap->a_fflag & FWRITE) {
+		fip->fi_writers--;
+		if (fip->fi_writers == 0)
+			socantrcvmore(fip->fi_readsock);
+	} else {
+		fip->fi_readers--;
+		if (fip->fi_readers == 0)
+			socantsendmore(fip->fi_writesock);
+	}
+	if (vp->v_usecount > 1)
+		return (0);
+	error1 = soclose(fip->fi_readsock);
+	error2 = soclose(fip->fi_writesock);
+	FREE(fip, M_VNODE);
+	vp->v_fifoinfo = NULL;
+	if (error1)
+		return (error1);
+	return (error2);
+}
+
+/*
+ * Print out the contents of a fifo vnode.
+ */
+fifo_print(ap)
+	struct vop_print_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	printf("tag VT_NON");
+	fifo_printinfo(ap->a_vp);
+	printf("\n");
+}
+
+/*
+ * Print out internal contents of a fifo vnode.
+ */
+fifo_printinfo(vp)
+	struct vnode *vp;
+{
+	register struct fifoinfo *fip = vp->v_fifoinfo;
+
+	printf(", fifo with %d readers and %d writers",
+		fip->fi_readers, fip->fi_writers);
+}
+
+/*
+ * Return POSIX pathconf information applicable to fifo's.
+ */
+fifo_pathconf(ap)
+	struct vop_pathconf_args /* {
+		struct vnode *a_vp;
+		int a_name;
+		int *a_retval;
+	} */ *ap;
+{
+
+	switch (ap->a_name) {
+	case _PC_LINK_MAX:
+		*ap->a_retval = LINK_MAX;
+		return (0);
+	case _PC_PIPE_BUF:
+		*ap->a_retval = PIPE_BUF;
+		return (0);
+	case _PC_CHOWN_RESTRICTED:
+		*ap->a_retval = 1;
+		return (0);
+	default:
+		return (EINVAL);
+	}
+	/* NOTREACHED */
+}
+
+/*
+ * Fifo failed operation
+ */
+fifo_ebadf()
+{
+
+	return (EBADF);
+}
+
+/*
+ * Fifo advisory byte-level locks.
+ */
+/* ARGSUSED */
+fifo_advlock(ap)
+	struct vop_advlock_args /* {
+		struct vnode *a_vp;
+		caddr_t  a_id;
+		int  a_op;
+		struct flock *a_fl;
+		int  a_flags;
+	} */ *ap;
+{
+
+	return (EOPNOTSUPP);
+}
+
+/*
+ * Fifo bad operation
+ */
+fifo_badop()
+{
+
+	panic("fifo_badop called");
+	/* NOTREACHED */
+}