d2d3e8751c
structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
708 lines
16 KiB
C
708 lines
16 KiB
C
/*
|
|
* 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.
|
|
* 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.
|
|
*
|
|
* @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
|
|
* $Id: sys_generic.c,v 1.15 1995/11/11 06:57:34 bde Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/file.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/malloc.h>
|
|
#ifdef KTRACE
|
|
#include <sys/ktrace.h>
|
|
#endif
|
|
#include <vm/vm.h>
|
|
|
|
int selscan __P((struct proc *, fd_set *, fd_set *, int, int *));
|
|
|
|
/*
|
|
* Read system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct read_args {
|
|
int fd;
|
|
char *buf;
|
|
u_int nbyte;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
read(p, uap, retval)
|
|
struct proc *p;
|
|
register struct read_args *uap;
|
|
int *retval;
|
|
{
|
|
register struct file *fp;
|
|
register struct filedesc *fdp = p->p_fd;
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
long cnt, error = 0;
|
|
#ifdef KTRACE
|
|
struct iovec ktriov;
|
|
#endif
|
|
|
|
if (((u_int)uap->fd) >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
|
|
(fp->f_flag & FREAD) == 0)
|
|
return (EBADF);
|
|
aiov.iov_base = (caddr_t)uap->buf;
|
|
aiov.iov_len = uap->nbyte;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
|
|
auio.uio_resid = uap->nbyte;
|
|
if (auio.uio_resid < 0)
|
|
return (EINVAL);
|
|
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_segflg = UIO_USERSPACE;
|
|
auio.uio_procp = p;
|
|
#ifdef KTRACE
|
|
/*
|
|
* if tracing, save a copy of iovec
|
|
*/
|
|
if (KTRPOINT(p, KTR_GENIO))
|
|
ktriov = aiov;
|
|
#endif
|
|
cnt = uap->nbyte;
|
|
if ((error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred)))
|
|
if (auio.uio_resid != cnt && (error == ERESTART ||
|
|
error == EINTR || error == EWOULDBLOCK))
|
|
error = 0;
|
|
cnt -= auio.uio_resid;
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_GENIO) && error == 0)
|
|
ktrgenio(p->p_tracep, uap->fd, UIO_READ, &ktriov, cnt, error);
|
|
#endif
|
|
*retval = cnt;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Scatter read system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct readv_args {
|
|
int fd;
|
|
struct iovec *iovp;
|
|
u_int iovcnt;
|
|
};
|
|
#endif
|
|
int
|
|
readv(p, uap, retval)
|
|
struct proc *p;
|
|
register struct readv_args *uap;
|
|
int *retval;
|
|
{
|
|
register struct file *fp;
|
|
register struct filedesc *fdp = p->p_fd;
|
|
struct uio auio;
|
|
register struct iovec *iov;
|
|
struct iovec *needfree;
|
|
struct iovec aiov[UIO_SMALLIOV];
|
|
long i, cnt, error = 0;
|
|
u_int iovlen;
|
|
#ifdef KTRACE
|
|
struct iovec *ktriov = NULL;
|
|
#endif
|
|
|
|
if (((u_int)uap->fd) >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
|
|
(fp->f_flag & FREAD) == 0)
|
|
return (EBADF);
|
|
/* note: can't use iovlen until iovcnt is validated */
|
|
iovlen = uap->iovcnt * sizeof (struct iovec);
|
|
if (uap->iovcnt > UIO_SMALLIOV) {
|
|
if (uap->iovcnt > UIO_MAXIOV)
|
|
return (EINVAL);
|
|
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
|
|
needfree = iov;
|
|
} else {
|
|
iov = aiov;
|
|
needfree = NULL;
|
|
}
|
|
auio.uio_iov = iov;
|
|
auio.uio_iovcnt = uap->iovcnt;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_segflg = UIO_USERSPACE;
|
|
auio.uio_procp = p;
|
|
if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
|
|
goto done;
|
|
auio.uio_resid = 0;
|
|
for (i = 0; i < uap->iovcnt; i++) {
|
|
auio.uio_resid += iov->iov_len;
|
|
if (auio.uio_resid < 0) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
iov++;
|
|
}
|
|
#ifdef KTRACE
|
|
/*
|
|
* if tracing, save a copy of iovec
|
|
*/
|
|
if (KTRPOINT(p, KTR_GENIO)) {
|
|
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
|
|
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
|
|
}
|
|
#endif
|
|
cnt = auio.uio_resid;
|
|
if ((error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred)))
|
|
if (auio.uio_resid != cnt && (error == ERESTART ||
|
|
error == EINTR || error == EWOULDBLOCK))
|
|
error = 0;
|
|
cnt -= auio.uio_resid;
|
|
#ifdef KTRACE
|
|
if (ktriov != NULL) {
|
|
if (error == 0)
|
|
ktrgenio(p->p_tracep, uap->fd, UIO_READ, ktriov,
|
|
cnt, error);
|
|
FREE(ktriov, M_TEMP);
|
|
}
|
|
#endif
|
|
*retval = cnt;
|
|
done:
|
|
if (needfree)
|
|
FREE(needfree, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Write system call
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct write_args {
|
|
int fd;
|
|
char *buf;
|
|
u_int nbyte;
|
|
};
|
|
#endif
|
|
int
|
|
write(p, uap, retval)
|
|
struct proc *p;
|
|
register struct write_args *uap;
|
|
int *retval;
|
|
{
|
|
register struct file *fp;
|
|
register struct filedesc *fdp = p->p_fd;
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
long cnt, error = 0;
|
|
#ifdef KTRACE
|
|
struct iovec ktriov;
|
|
#endif
|
|
|
|
if (((u_int)uap->fd) >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
|
|
(fp->f_flag & FWRITE) == 0)
|
|
return (EBADF);
|
|
aiov.iov_base = (caddr_t)uap->buf;
|
|
aiov.iov_len = uap->nbyte;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_resid = uap->nbyte;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_segflg = UIO_USERSPACE;
|
|
auio.uio_procp = p;
|
|
#ifdef KTRACE
|
|
/*
|
|
* if tracing, save a copy of iovec
|
|
*/
|
|
if (KTRPOINT(p, KTR_GENIO))
|
|
ktriov = aiov;
|
|
#endif
|
|
cnt = uap->nbyte;
|
|
if ((error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred))) {
|
|
if (auio.uio_resid != cnt && (error == ERESTART ||
|
|
error == EINTR || error == EWOULDBLOCK))
|
|
error = 0;
|
|
if (error == EPIPE)
|
|
psignal(p, SIGPIPE);
|
|
}
|
|
cnt -= auio.uio_resid;
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_GENIO) && error == 0)
|
|
ktrgenio(p->p_tracep, uap->fd, UIO_WRITE,
|
|
&ktriov, cnt, error);
|
|
#endif
|
|
*retval = cnt;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Gather write system call
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct writev_args {
|
|
int fd;
|
|
struct iovec *iovp;
|
|
u_int iovcnt;
|
|
};
|
|
#endif
|
|
int
|
|
writev(p, uap, retval)
|
|
struct proc *p;
|
|
register struct writev_args *uap;
|
|
int *retval;
|
|
{
|
|
register struct file *fp;
|
|
register struct filedesc *fdp = p->p_fd;
|
|
struct uio auio;
|
|
register struct iovec *iov;
|
|
struct iovec *needfree;
|
|
struct iovec aiov[UIO_SMALLIOV];
|
|
long i, cnt, error = 0;
|
|
u_int iovlen;
|
|
#ifdef KTRACE
|
|
struct iovec *ktriov = NULL;
|
|
#endif
|
|
|
|
if (((u_int)uap->fd) >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL ||
|
|
(fp->f_flag & FWRITE) == 0)
|
|
return (EBADF);
|
|
/* note: can't use iovlen until iovcnt is validated */
|
|
iovlen = uap->iovcnt * sizeof (struct iovec);
|
|
if (uap->iovcnt > UIO_SMALLIOV) {
|
|
if (uap->iovcnt > UIO_MAXIOV)
|
|
return (EINVAL);
|
|
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
|
|
needfree = iov;
|
|
} else {
|
|
iov = aiov;
|
|
needfree = NULL;
|
|
}
|
|
auio.uio_iov = iov;
|
|
auio.uio_iovcnt = uap->iovcnt;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_segflg = UIO_USERSPACE;
|
|
auio.uio_procp = p;
|
|
if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
|
|
goto done;
|
|
auio.uio_resid = 0;
|
|
for (i = 0; i < uap->iovcnt; i++) {
|
|
auio.uio_resid += iov->iov_len;
|
|
if (auio.uio_resid < 0) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
iov++;
|
|
}
|
|
#ifdef KTRACE
|
|
/*
|
|
* if tracing, save a copy of iovec
|
|
*/
|
|
if (KTRPOINT(p, KTR_GENIO)) {
|
|
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
|
|
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
|
|
}
|
|
#endif
|
|
cnt = auio.uio_resid;
|
|
if ((error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred))) {
|
|
if (auio.uio_resid != cnt && (error == ERESTART ||
|
|
error == EINTR || error == EWOULDBLOCK))
|
|
error = 0;
|
|
if (error == EPIPE)
|
|
psignal(p, SIGPIPE);
|
|
}
|
|
cnt -= auio.uio_resid;
|
|
#ifdef KTRACE
|
|
if (ktriov != NULL) {
|
|
if (error == 0)
|
|
ktrgenio(p->p_tracep, uap->fd, UIO_WRITE,
|
|
ktriov, cnt, error);
|
|
FREE(ktriov, M_TEMP);
|
|
}
|
|
#endif
|
|
*retval = cnt;
|
|
done:
|
|
if (needfree)
|
|
FREE(needfree, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Ioctl system call
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ioctl_args {
|
|
int fd;
|
|
int com;
|
|
caddr_t data;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
ioctl(p, uap, retval)
|
|
struct proc *p;
|
|
register struct ioctl_args *uap;
|
|
int *retval;
|
|
{
|
|
register struct file *fp;
|
|
register struct filedesc *fdp;
|
|
register int com, error;
|
|
register u_int size;
|
|
caddr_t data, memp;
|
|
int tmp;
|
|
#define STK_PARAMS 128
|
|
char stkbuf[STK_PARAMS];
|
|
|
|
fdp = p->p_fd;
|
|
if ((u_int)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
|
|
if ((fp->f_flag & (FREAD | FWRITE)) == 0)
|
|
return (EBADF);
|
|
|
|
switch (com = uap->com) {
|
|
case FIONCLEX:
|
|
fdp->fd_ofileflags[uap->fd] &= ~UF_EXCLOSE;
|
|
return (0);
|
|
case FIOCLEX:
|
|
fdp->fd_ofileflags[uap->fd] |= UF_EXCLOSE;
|
|
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);
|
|
}
|
|
|
|
int selwait, nselcoll;
|
|
|
|
/*
|
|
* Select system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct select_args {
|
|
u_int nd;
|
|
fd_set *in, *ou, *ex;
|
|
struct timeval *tv;
|
|
};
|
|
#endif
|
|
int
|
|
select(p, uap, retval)
|
|
register struct proc *p;
|
|
register struct select_args *uap;
|
|
int *retval;
|
|
{
|
|
fd_set ibits[3], obits[3];
|
|
struct timeval atv;
|
|
int s, ncoll, error = 0, timo;
|
|
u_int ni;
|
|
|
|
bzero((caddr_t)ibits, sizeof(ibits));
|
|
bzero((caddr_t)obits, sizeof(obits));
|
|
if (uap->nd > FD_SETSIZE)
|
|
return (EINVAL);
|
|
if (uap->nd > p->p_fd->fd_nfiles)
|
|
uap->nd = p->p_fd->fd_nfiles; /* forgiving; slightly wrong */
|
|
ni = howmany(uap->nd, NFDBITS) * sizeof(fd_mask);
|
|
|
|
#define getbits(name, x) \
|
|
if (uap->name && \
|
|
(error = copyin((caddr_t)uap->name, (caddr_t)&ibits[x], ni))) \
|
|
goto done;
|
|
getbits(in, 0);
|
|
getbits(ou, 1);
|
|
getbits(ex, 2);
|
|
#undef getbits
|
|
|
|
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;
|
|
}
|
|
s = splclock();
|
|
timevaladd(&atv, (struct timeval *)&time);
|
|
timo = hzto(&atv);
|
|
/*
|
|
* Avoid inadvertently sleeping forever.
|
|
*/
|
|
if (timo == 0)
|
|
timo = 1;
|
|
splx(s);
|
|
} else
|
|
timo = 0;
|
|
retry:
|
|
ncoll = nselcoll;
|
|
p->p_flag |= P_SELECT;
|
|
error = selscan(p, ibits, obits, uap->nd, retval);
|
|
if (error || *retval)
|
|
goto done;
|
|
s = splhigh();
|
|
/* this should be timercmp(&time, &atv, >=) */
|
|
if (uap->tv && (time.tv_sec > atv.tv_sec ||
|
|
(time.tv_sec == atv.tv_sec && time.tv_usec >= atv.tv_usec))) {
|
|
splx(s);
|
|
goto done;
|
|
}
|
|
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((caddr_t)&obits[x], (caddr_t)uap->name, ni))) \
|
|
error = error2;
|
|
if (error == 0) {
|
|
int error2;
|
|
|
|
putbits(in, 0);
|
|
putbits(ou, 1);
|
|
putbits(ex, 2);
|
|
#undef putbits
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
selscan(p, ibits, obits, nfd, retval)
|
|
struct proc *p;
|
|
fd_set *ibits, *obits;
|
|
int nfd, *retval;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register int msk, i, j, fd;
|
|
register fd_mask bits;
|
|
struct file *fp;
|
|
int n = 0;
|
|
static int flag[3] = { FREAD, FWRITE, 0 };
|
|
|
|
for (msk = 0; msk < 3; msk++) {
|
|
for (i = 0; i < nfd; i += NFDBITS) {
|
|
bits = ibits[msk].fds_bits[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_select)(fp, flag[msk], p)) {
|
|
FD_SET(fd, &obits[msk]);
|
|
n++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*retval = n;
|
|
return (0);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
seltrue(dev, flag, p)
|
|
dev_t dev;
|
|
int flag;
|
|
struct proc *p;
|
|
{
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|