/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include /* * 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 */ }