426da3bcfb
Seigo Tanimura (tanimura) posted the initial delta.
I've polished it quite a bit reducing the need for locking and
adapting it for KSE.
Locks:
1 mutex in each filedesc
protects all the fields.
protects "struct file" initialization, while a struct file
is being changed from &badfileops -> &pipeops or something
the filedesc should be locked.
1 mutex in each struct file
protects the refcount fields.
doesn't protect anything else.
the flags used for garbage collection have been moved to
f_gcflag which was the FILLER short, this doesn't need
locking because the garbage collection is a single threaded
container.
could likely be made to use a pool mutex.
1 sx lock for the global filelist.
struct file * fhold(struct file *fp);
/* increments reference count on a file */
struct file * fhold_locked(struct file *fp);
/* like fhold but expects file to locked */
struct file * ffind_hold(struct thread *, int fd);
/* finds the struct file in thread, adds one reference and
returns it unlocked */
struct file * ffind_lock(struct thread *, int fd);
/* ffind_hold, but returns file locked */
I still have to smp-safe the fget cruft, I'll get to that asap.
169 lines
4.4 KiB
C
169 lines
4.4 KiB
C
/*
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* Copyright (c) 1998 Mark Newton
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* Copyright (c) 1994 Christos Zoulas
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/fcntl.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/systm.h>
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#include <compat/svr4/svr4.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_util.h>
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#include <compat/svr4/svr4_signal.h>
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#include <compat/svr4/svr4_proto.h>
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#include <compat/svr4/svr4_stropts.h>
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#include <compat/svr4/svr4_ioctl.h>
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#include <compat/svr4/svr4_termios.h>
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#include <compat/svr4/svr4_ttold.h>
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#include <compat/svr4/svr4_filio.h>
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#include <compat/svr4/svr4_sockio.h>
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#ifdef DEBUG_SVR4
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static void svr4_decode_cmd __P((u_long, char *, char *, int *, int *));
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/*
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* Decode an ioctl command symbolically
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*/
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static void
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svr4_decode_cmd(cmd, dir, c, num, argsiz)
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u_long cmd;
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char *dir, *c;
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int *num, *argsiz;
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{
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if (cmd & SVR4_IOC_VOID)
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*dir++ = 'V';
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if (cmd & SVR4_IOC_IN)
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*dir++ = 'R';
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if (cmd & SVR4_IOC_OUT)
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*dir++ = 'W';
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*dir = '\0';
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if (cmd & SVR4_IOC_INOUT)
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*argsiz = (cmd >> 16) & 0xff;
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else
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*argsiz = -1;
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*c = (cmd >> 8) & 0xff;
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*num = cmd & 0xff;
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}
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#endif
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int
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svr4_sys_ioctl(td, uap)
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register struct thread *td;
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struct svr4_sys_ioctl_args *uap;
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{
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int *retval;
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struct file *fp;
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u_long cmd;
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int (*fun) __P((struct file *, struct thread *, register_t *,
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int, u_long, caddr_t));
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int error;
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#ifdef DEBUG_SVR4
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char dir[4];
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char c;
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int num;
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int argsiz;
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svr4_decode_cmd(SCARG(uap, com), dir, &c, &num, &argsiz);
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DPRINTF(("svr4_ioctl[%lx](%d, _IO%s(%c, %d, %d), %p);\n", SCARG(uap, com), SCARG(uap, fd),
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dir, c, num, argsiz, SCARG(uap, data)));
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#endif
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retval = td->td_retval;
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cmd = SCARG(uap, com);
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fp = ffind_hold(td, uap->fd);
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if (fp == NULL)
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return EBADF;
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if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
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fdrop(fp, td);
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return EBADF;
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}
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#if defined(DEBUG_SVR4)
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if (fp->f_type == DTYPE_SOCKET) {
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struct socket *so = (struct socket *)fp->f_data;
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DPRINTF(("<<< IN: so_state = 0x%x\n", so->so_state));
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}
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#endif
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switch (cmd & 0xff00) {
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case SVR4_tIOC:
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DPRINTF(("ttold\n"));
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fun = svr4_ttold_ioctl;
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break;
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case SVR4_TIOC:
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DPRINTF(("term\n"));
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fun = svr4_term_ioctl;
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break;
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case SVR4_STR:
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DPRINTF(("stream\n"));
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fun = svr4_stream_ioctl;
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break;
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case SVR4_FIOC:
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DPRINTF(("file\n"));
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fun = svr4_fil_ioctl;
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break;
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case SVR4_SIOC:
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DPRINTF(("socket\n"));
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fun = svr4_sock_ioctl;
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break;
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case SVR4_XIOC:
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/* We do not support those */
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fdrop(fp, td);
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return EINVAL;
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default:
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fdrop(fp, td);
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DPRINTF(("Unimplemented ioctl %lx\n", cmd));
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return 0; /* XXX: really ENOSYS */
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}
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#if defined(DEBUG_SVR4)
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if (fp->f_type == DTYPE_SOCKET) {
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struct socket *so;
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so = (struct socket *)fp->f_data;
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DPRINTF((">>> OUT: so_state = 0x%x\n", so->so_state));
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}
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#endif
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error = (*fun)(fp, td, retval, SCARG(uap, fd), cmd, SCARG(uap, data));
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fdrop(fp, td);
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return (error);
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}
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