899 lines
20 KiB
C
899 lines
20 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
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* $Id: sys_generic.c,v 1.37 1998/04/05 10:03:52 ache Exp $
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*/
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/filedesc.h>
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#include <sys/filio.h>
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#include <sys/ttycom.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/socketvar.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/poll.h>
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#include <sys/sysent.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer");
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static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
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MALLOC_DEFINE(M_IOV, "iov", "large iov's");
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static int pollscan __P((struct proc *, struct pollfd *, int));
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static int selscan __P((struct proc *, fd_mask **, fd_mask **, int));
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/*
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* Read system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct read_args {
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int fd;
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char *buf;
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u_int nbyte;
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};
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#endif
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/* ARGSUSED */
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int
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read(p, uap)
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struct proc *p;
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register struct read_args *uap;
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{
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register struct file *fp;
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register struct filedesc *fdp = p->p_fd;
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struct uio auio;
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struct iovec aiov;
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long cnt, error = 0;
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#ifdef KTRACE
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struct iovec ktriov;
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#endif
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if (((u_int)uap->fd) >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
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(fp->f_flag & FREAD) == 0)
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return (EBADF);
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aiov.iov_base = (caddr_t)uap->buf;
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aiov.iov_len = uap->nbyte;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = -1;
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auio.uio_resid = uap->nbyte;
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if (auio.uio_resid < 0)
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return (EINVAL);
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auio.uio_rw = UIO_READ;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_procp = p;
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#ifdef KTRACE
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/*
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* if tracing, save a copy of iovec
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*/
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if (KTRPOINT(p, KTR_GENIO))
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ktriov = aiov;
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#endif
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cnt = uap->nbyte;
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if ((error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred)))
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if (auio.uio_resid != cnt && (error == ERESTART ||
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error == EINTR || error == EWOULDBLOCK))
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error = 0;
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cnt -= auio.uio_resid;
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_GENIO) && error == 0)
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ktrgenio(p->p_tracep, uap->fd, UIO_READ, &ktriov, cnt, error);
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#endif
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p->p_retval[0] = cnt;
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return (error);
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}
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/*
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* Scatter read system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct readv_args {
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int fd;
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struct iovec *iovp;
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u_int iovcnt;
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};
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#endif
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int
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readv(p, uap)
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struct proc *p;
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register struct readv_args *uap;
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{
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register struct file *fp;
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register struct filedesc *fdp = p->p_fd;
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struct uio auio;
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register struct iovec *iov;
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struct iovec *needfree;
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struct iovec aiov[UIO_SMALLIOV];
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long i, cnt, error = 0;
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u_int iovlen;
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#ifdef KTRACE
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struct iovec *ktriov = NULL;
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#endif
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if (((u_int)uap->fd) >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
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(fp->f_flag & FREAD) == 0)
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return (EBADF);
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/* note: can't use iovlen until iovcnt is validated */
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iovlen = uap->iovcnt * sizeof (struct iovec);
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if (uap->iovcnt > UIO_SMALLIOV) {
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if (uap->iovcnt > UIO_MAXIOV)
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return (EINVAL);
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MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
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needfree = iov;
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} else {
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iov = aiov;
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needfree = NULL;
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}
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auio.uio_iov = iov;
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auio.uio_iovcnt = uap->iovcnt;
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auio.uio_rw = UIO_READ;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_procp = p;
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auio.uio_offset = -1;
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if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
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goto done;
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auio.uio_resid = 0;
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for (i = 0; i < uap->iovcnt; i++) {
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auio.uio_resid += iov->iov_len;
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if (auio.uio_resid < 0) {
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error = EINVAL;
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goto done;
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}
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iov++;
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}
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#ifdef KTRACE
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/*
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* if tracing, save a copy of iovec
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*/
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if (KTRPOINT(p, KTR_GENIO)) {
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MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
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bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
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}
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#endif
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cnt = auio.uio_resid;
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if ((error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred)))
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if (auio.uio_resid != cnt && (error == ERESTART ||
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error == EINTR || error == EWOULDBLOCK))
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error = 0;
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cnt -= auio.uio_resid;
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#ifdef KTRACE
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if (ktriov != NULL) {
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if (error == 0)
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ktrgenio(p->p_tracep, uap->fd, UIO_READ, ktriov,
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cnt, error);
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FREE(ktriov, M_TEMP);
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}
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#endif
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p->p_retval[0] = cnt;
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done:
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if (needfree)
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FREE(needfree, M_IOV);
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return (error);
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}
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/*
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* Write system call
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct write_args {
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int fd;
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char *buf;
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u_int nbyte;
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};
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#endif
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int
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write(p, uap)
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struct proc *p;
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register struct write_args *uap;
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{
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register struct file *fp;
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register struct filedesc *fdp = p->p_fd;
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struct uio auio;
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struct iovec aiov;
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long cnt, error = 0;
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#ifdef KTRACE
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struct iovec ktriov;
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#endif
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if (((u_int)uap->fd) >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
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(fp->f_flag & FWRITE) == 0)
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return (EBADF);
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aiov.iov_base = (caddr_t)uap->buf;
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aiov.iov_len = uap->nbyte;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = -1;
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auio.uio_resid = uap->nbyte;
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auio.uio_rw = UIO_WRITE;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_procp = p;
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#ifdef KTRACE
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/*
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* if tracing, save a copy of iovec
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*/
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if (KTRPOINT(p, KTR_GENIO))
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ktriov = aiov;
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#endif
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cnt = uap->nbyte;
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if ((error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred))) {
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if (auio.uio_resid != cnt && (error == ERESTART ||
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error == EINTR || error == EWOULDBLOCK))
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error = 0;
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if (error == EPIPE)
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psignal(p, SIGPIPE);
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}
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cnt -= auio.uio_resid;
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_GENIO) && error == 0)
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ktrgenio(p->p_tracep, uap->fd, UIO_WRITE,
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&ktriov, cnt, error);
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#endif
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p->p_retval[0] = cnt;
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return (error);
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}
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/*
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* Gather write system call
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct writev_args {
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int fd;
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struct iovec *iovp;
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u_int iovcnt;
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};
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#endif
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int
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writev(p, uap)
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struct proc *p;
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register struct writev_args *uap;
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{
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register struct file *fp;
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register struct filedesc *fdp = p->p_fd;
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struct uio auio;
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register struct iovec *iov;
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struct iovec *needfree;
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struct iovec aiov[UIO_SMALLIOV];
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long i, cnt, error = 0;
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u_int iovlen;
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#ifdef KTRACE
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struct iovec *ktriov = NULL;
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#endif
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if (((u_int)uap->fd) >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
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(fp->f_flag & FWRITE) == 0)
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return (EBADF);
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/* note: can't use iovlen until iovcnt is validated */
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iovlen = uap->iovcnt * sizeof (struct iovec);
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if (uap->iovcnt > UIO_SMALLIOV) {
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if (uap->iovcnt > UIO_MAXIOV)
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return (EINVAL);
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MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
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needfree = iov;
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} else {
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iov = aiov;
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needfree = NULL;
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}
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auio.uio_iov = iov;
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auio.uio_iovcnt = uap->iovcnt;
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auio.uio_rw = UIO_WRITE;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_procp = p;
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auio.uio_offset = -1;
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if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
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goto done;
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auio.uio_resid = 0;
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for (i = 0; i < uap->iovcnt; i++) {
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auio.uio_resid += iov->iov_len;
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if (auio.uio_resid < 0) {
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error = EINVAL;
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goto done;
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}
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iov++;
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}
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#ifdef KTRACE
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/*
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* if tracing, save a copy of iovec
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*/
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if (KTRPOINT(p, KTR_GENIO)) {
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MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
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bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
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}
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#endif
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cnt = auio.uio_resid;
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if ((error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred))) {
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if (auio.uio_resid != cnt && (error == ERESTART ||
|
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error == EINTR || error == EWOULDBLOCK))
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error = 0;
|
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if (error == EPIPE)
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psignal(p, SIGPIPE);
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}
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cnt -= auio.uio_resid;
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#ifdef KTRACE
|
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if (ktriov != NULL) {
|
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if (error == 0)
|
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ktrgenio(p->p_tracep, uap->fd, UIO_WRITE,
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ktriov, cnt, error);
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FREE(ktriov, M_TEMP);
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}
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#endif
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p->p_retval[0] = cnt;
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done:
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if (needfree)
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FREE(needfree, M_IOV);
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return (error);
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}
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|
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/*
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* Ioctl system call
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct ioctl_args {
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int fd;
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int com;
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caddr_t data;
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};
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#endif
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/* ARGSUSED */
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int
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ioctl(p, uap)
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struct proc *p;
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register struct ioctl_args *uap;
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{
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register struct file *fp;
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register struct filedesc *fdp;
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register int com, error;
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register u_int size;
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|
caddr_t data, memp;
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int tmp;
|
|
#define STK_PARAMS 128
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char stkbuf[STK_PARAMS];
|
|
|
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fdp = p->p_fd;
|
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if ((u_int)uap->fd >= fdp->fd_nfiles ||
|
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(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
|
|
if ((fp->f_flag & (FREAD | FWRITE)) == 0)
|
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return (EBADF);
|
|
|
|
switch (com = uap->com) {
|
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case FIONCLEX:
|
|
fdp->fd_ofileflags[uap->fd] &= ~UF_EXCLOSE;
|
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return (0);
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case FIOCLEX:
|
|
fdp->fd_ofileflags[uap->fd] |= UF_EXCLOSE;
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return (0);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
return (ENOTTY);
|
|
memp = NULL;
|
|
if (size > sizeof (stkbuf)) {
|
|
memp = (caddr_t)malloc((u_long)size, M_IOCTLOPS, M_WAITOK);
|
|
data = memp;
|
|
} else
|
|
data = stkbuf;
|
|
if (com&IOC_IN) {
|
|
if (size) {
|
|
error = copyin(uap->data, data, (u_int)size);
|
|
if (error) {
|
|
if (memp)
|
|
free(memp, M_IOCTLOPS);
|
|
return (error);
|
|
}
|
|
} else
|
|
*(caddr_t *)data = uap->data;
|
|
} else if ((com&IOC_OUT) && size)
|
|
/*
|
|
* Zero the buffer so the user always
|
|
* gets back something deterministic.
|
|
*/
|
|
bzero(data, size);
|
|
else if (com&IOC_VOID)
|
|
*(caddr_t *)data = uap->data;
|
|
|
|
switch (com) {
|
|
|
|
case FIONBIO:
|
|
if ((tmp = *(int *)data))
|
|
fp->f_flag |= FNONBLOCK;
|
|
else
|
|
fp->f_flag &= ~FNONBLOCK;
|
|
error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p);
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
if ((tmp = *(int *)data))
|
|
fp->f_flag |= FASYNC;
|
|
else
|
|
fp->f_flag &= ~FASYNC;
|
|
error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p);
|
|
break;
|
|
|
|
case FIOSETOWN:
|
|
tmp = *(int *)data;
|
|
if (fp->f_type == DTYPE_SOCKET) {
|
|
((struct socket *)fp->f_data)->so_pgid = tmp;
|
|
error = 0;
|
|
break;
|
|
}
|
|
if (tmp <= 0) {
|
|
tmp = -tmp;
|
|
} else {
|
|
struct proc *p1 = pfind(tmp);
|
|
if (p1 == 0) {
|
|
error = ESRCH;
|
|
break;
|
|
}
|
|
tmp = p1->p_pgrp->pg_id;
|
|
}
|
|
error = (*fp->f_ops->fo_ioctl)
|
|
(fp, (int)TIOCSPGRP, (caddr_t)&tmp, p);
|
|
break;
|
|
|
|
case FIOGETOWN:
|
|
if (fp->f_type == DTYPE_SOCKET) {
|
|
error = 0;
|
|
*(int *)data = ((struct socket *)fp->f_data)->so_pgid;
|
|
break;
|
|
}
|
|
error = (*fp->f_ops->fo_ioctl)(fp, (int)TIOCGPGRP, data, p);
|
|
*(int *)data = -*(int *)data;
|
|
break;
|
|
|
|
default:
|
|
error = (*fp->f_ops->fo_ioctl)(fp, com, data, p);
|
|
/*
|
|
* Copy any data to user, size was
|
|
* already set and checked above.
|
|
*/
|
|
if (error == 0 && (com&IOC_OUT) && size)
|
|
error = copyout(data, uap->data, (u_int)size);
|
|
break;
|
|
}
|
|
if (memp)
|
|
free(memp, M_IOCTLOPS);
|
|
return (error);
|
|
}
|
|
|
|
static int nselcoll;
|
|
int selwait;
|
|
|
|
/*
|
|
* Select system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct select_args {
|
|
int nd;
|
|
fd_set *in, *ou, *ex;
|
|
struct timeval *tv;
|
|
};
|
|
#endif
|
|
int
|
|
select(p, uap)
|
|
register struct proc *p;
|
|
register struct select_args *uap;
|
|
{
|
|
/*
|
|
* 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 s, ncoll, error, timo;
|
|
u_int nbufbytes, ncpbytes, nfdbits;
|
|
|
|
if (uap->nd < 0)
|
|
return (EINVAL);
|
|
if (uap->nd > p->p_fd->fd_nfiles)
|
|
uap->nd = p->p_fd->fd_nfiles; /* forgiving; slightly wrong */
|
|
|
|
/*
|
|
* Allocate just enough bits for the non-null fd_sets. Use the
|
|
* preallocated auto buffer if possible.
|
|
*/
|
|
nfdbits = roundup(uap->nd, NFDBITS);
|
|
ncpbytes = nfdbits / NBBY;
|
|
nbufbytes = 0;
|
|
if (uap->in != NULL)
|
|
nbufbytes += 2 * ncpbytes;
|
|
if (uap->ou != NULL)
|
|
nbufbytes += 2 * ncpbytes;
|
|
if (uap->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 (uap->name == NULL) \
|
|
ibits[x] = NULL; \
|
|
else { \
|
|
ibits[x] = sbp + nbufbytes / 2 / sizeof *sbp; \
|
|
obits[x] = sbp; \
|
|
sbp += ncpbytes / sizeof *sbp; \
|
|
error = copyin(uap->name, ibits[x], ncpbytes); \
|
|
if (error != 0) \
|
|
goto done; \
|
|
} \
|
|
} while (0)
|
|
getbits(in, 0);
|
|
getbits(ou, 1);
|
|
getbits(ex, 2);
|
|
#undef getbits
|
|
if (nbufbytes != 0)
|
|
bzero(selbits, nbufbytes / 2);
|
|
|
|
if (uap->tv) {
|
|
error = copyin((caddr_t)uap->tv, (caddr_t)&atv,
|
|
sizeof (atv));
|
|
if (error)
|
|
goto done;
|
|
if (itimerfix(&atv)) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
getmicrouptime(&rtv);
|
|
timevaladd(&atv, &rtv);
|
|
} else
|
|
atv.tv_sec = 0;
|
|
timo = 0;
|
|
retry:
|
|
ncoll = nselcoll;
|
|
p->p_flag |= P_SELECT;
|
|
error = selscan(p, ibits, obits, uap->nd);
|
|
if (error || p->p_retval[0])
|
|
goto done;
|
|
if (atv.tv_sec) {
|
|
getmicrouptime(&rtv);
|
|
if (timevalcmp(&rtv, &atv, >=))
|
|
goto done;
|
|
ttv = atv;
|
|
timevalsub(&ttv, &rtv);
|
|
timo = ttv.tv_sec > 24 * 60 * 60 ?
|
|
24 * 60 * 60 * hz : tvtohz(&ttv);
|
|
}
|
|
s = splhigh();
|
|
if ((p->p_flag & P_SELECT) == 0 || nselcoll != ncoll) {
|
|
splx(s);
|
|
goto retry;
|
|
}
|
|
p->p_flag &= ~P_SELECT;
|
|
error = tsleep((caddr_t)&selwait, PSOCK | PCATCH, "select", timo);
|
|
splx(s);
|
|
if (error == 0)
|
|
goto retry;
|
|
done:
|
|
p->p_flag &= ~P_SELECT;
|
|
/* select is not restarted after signals... */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
if (error == EWOULDBLOCK)
|
|
error = 0;
|
|
#define putbits(name, x) \
|
|
if (uap->name && (error2 = copyout(obits[x], uap->name, ncpbytes))) \
|
|
error = error2;
|
|
if (error == 0) {
|
|
int error2;
|
|
|
|
putbits(in, 0);
|
|
putbits(ou, 1);
|
|
putbits(ex, 2);
|
|
#undef putbits
|
|
}
|
|
if (selbits != &s_selbits[0])
|
|
free(selbits, M_SELECT);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
selscan(p, ibits, obits, nfd)
|
|
struct proc *p;
|
|
fd_mask **ibits, **obits;
|
|
int nfd;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register int msk, i, j, fd;
|
|
register fd_mask bits;
|
|
struct file *fp;
|
|
int n = 0;
|
|
/* Note: backend also returns POLLHUP/POLLERR if appropriate. */
|
|
static int flag[3] = { POLLRDNORM, POLLWRNORM, POLLRDBAND };
|
|
|
|
for (msk = 0; msk < 3; msk++) {
|
|
if (ibits[msk] == NULL)
|
|
continue;
|
|
for (i = 0; i < nfd; i += NFDBITS) {
|
|
bits = ibits[msk][i/NFDBITS];
|
|
while ((j = ffs(bits)) && (fd = i + --j) < nfd) {
|
|
bits &= ~(1 << j);
|
|
fp = fdp->fd_ofiles[fd];
|
|
if (fp == NULL)
|
|
return (EBADF);
|
|
if ((*fp->f_ops->fo_poll)(fp, flag[msk],
|
|
fp->f_cred, p)) {
|
|
obits[msk][(fd)/NFDBITS] |=
|
|
(1 << ((fd) % NFDBITS));
|
|
n++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
p->p_retval[0] = n;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Poll system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct poll_args {
|
|
struct pollfd *fds;
|
|
u_int nfds;
|
|
int timeout;
|
|
};
|
|
#endif
|
|
int
|
|
poll(p, uap)
|
|
register struct proc *p;
|
|
register struct poll_args *uap;
|
|
{
|
|
caddr_t bits;
|
|
char smallbits[32 * sizeof(struct pollfd)];
|
|
struct timeval atv, rtv, ttv;
|
|
int s, ncoll, error = 0, timo;
|
|
size_t ni;
|
|
|
|
if (SCARG(uap, nfds) > p->p_fd->fd_nfiles) {
|
|
/* forgiving; slightly wrong */
|
|
SCARG(uap, nfds) = p->p_fd->fd_nfiles;
|
|
}
|
|
ni = SCARG(uap, nfds) * sizeof(struct pollfd);
|
|
if (ni > sizeof(smallbits))
|
|
bits = malloc(ni, M_TEMP, M_WAITOK);
|
|
else
|
|
bits = smallbits;
|
|
error = copyin(SCARG(uap, fds), bits, ni);
|
|
if (error)
|
|
goto done;
|
|
if (SCARG(uap, timeout) != INFTIM) {
|
|
atv.tv_sec = SCARG(uap, timeout) / 1000;
|
|
atv.tv_usec = (SCARG(uap, timeout) % 1000) * 1000;
|
|
if (itimerfix(&atv)) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
getmicrouptime(&rtv);
|
|
timevaladd(&atv, &rtv);
|
|
} else
|
|
atv.tv_sec = 0;
|
|
timo = 0;
|
|
retry:
|
|
ncoll = nselcoll;
|
|
p->p_flag |= P_SELECT;
|
|
error = pollscan(p, (struct pollfd *)bits, SCARG(uap, nfds));
|
|
if (error || p->p_retval[0])
|
|
goto done;
|
|
if (atv.tv_sec) {
|
|
getmicrouptime(&rtv);
|
|
if (timevalcmp(&rtv, &atv, >=))
|
|
goto done;
|
|
ttv = atv;
|
|
timevalsub(&ttv, &rtv);
|
|
timo = ttv.tv_sec > 24 * 60 * 60 ?
|
|
24 * 60 * 60 * hz : tvtohz(&ttv);
|
|
}
|
|
s = splhigh();
|
|
if ((p->p_flag & P_SELECT) == 0 || nselcoll != ncoll) {
|
|
splx(s);
|
|
goto retry;
|
|
}
|
|
p->p_flag &= ~P_SELECT;
|
|
error = tsleep((caddr_t)&selwait, PSOCK | PCATCH, "poll", timo);
|
|
splx(s);
|
|
if (error == 0)
|
|
goto retry;
|
|
done:
|
|
p->p_flag &= ~P_SELECT;
|
|
/* poll is not restarted after signals... */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
if (error == EWOULDBLOCK)
|
|
error = 0;
|
|
if (error == 0) {
|
|
error = copyout(bits, SCARG(uap, fds), ni);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
out:
|
|
if (ni > sizeof(smallbits))
|
|
free(bits, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
pollscan(p, fds, nfd)
|
|
struct proc *p;
|
|
struct pollfd *fds;
|
|
int nfd;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
int i;
|
|
struct file *fp;
|
|
int n = 0;
|
|
|
|
for (i = 0; i < nfd; i++, fds++) {
|
|
if ((u_int)fds->fd >= fdp->fd_nfiles) {
|
|
fds->revents = POLLNVAL;
|
|
n++;
|
|
} else {
|
|
fp = fdp->fd_ofiles[fds->fd];
|
|
if (fp == 0) {
|
|
fds->revents = POLLNVAL;
|
|
n++;
|
|
} else {
|
|
/*
|
|
* Note: backend also returns POLLHUP and
|
|
* POLLERR if appropriate.
|
|
*/
|
|
fds->revents = (*fp->f_ops->fo_poll)(fp,
|
|
fds->events, fp->f_cred, p);
|
|
if (fds->revents != 0)
|
|
n++;
|
|
}
|
|
}
|
|
}
|
|
p->p_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(p, uap)
|
|
register struct proc *p;
|
|
register struct openbsd_poll_args *uap;
|
|
{
|
|
return (poll(p, (struct poll_args *)uap));
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
seltrue(dev, events, p)
|
|
dev_t dev;
|
|
int events;
|
|
struct proc *p;
|
|
{
|
|
|
|
return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
|
|
}
|
|
|
|
/*
|
|
* Record a select request.
|
|
*/
|
|
void
|
|
selrecord(selector, sip)
|
|
struct proc *selector;
|
|
struct selinfo *sip;
|
|
{
|
|
struct proc *p;
|
|
pid_t mypid;
|
|
|
|
mypid = selector->p_pid;
|
|
if (sip->si_pid == mypid)
|
|
return;
|
|
if (sip->si_pid && (p = pfind(sip->si_pid)) &&
|
|
p->p_wchan == (caddr_t)&selwait)
|
|
sip->si_flags |= SI_COLL;
|
|
else
|
|
sip->si_pid = mypid;
|
|
}
|
|
|
|
/*
|
|
* Do a wakeup when a selectable event occurs.
|
|
*/
|
|
void
|
|
selwakeup(sip)
|
|
register struct selinfo *sip;
|
|
{
|
|
register struct proc *p;
|
|
int s;
|
|
|
|
if (sip->si_pid == 0)
|
|
return;
|
|
if (sip->si_flags & SI_COLL) {
|
|
nselcoll++;
|
|
sip->si_flags &= ~SI_COLL;
|
|
wakeup((caddr_t)&selwait);
|
|
}
|
|
p = pfind(sip->si_pid);
|
|
sip->si_pid = 0;
|
|
if (p != NULL) {
|
|
s = splhigh();
|
|
if (p->p_wchan == (caddr_t)&selwait) {
|
|
if (p->p_stat == SSLEEP)
|
|
setrunnable(p);
|
|
else
|
|
unsleep(p);
|
|
} else if (p->p_flag & P_SELECT)
|
|
p->p_flag &= ~P_SELECT;
|
|
splx(s);
|
|
}
|
|
}
|