The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/ibcs2/ibcs2_fcntl.c

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    1 /*-
    2  * Copyright (c) 1995 Scott Bartram
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. The name of the author may not be used to endorse or promote products
   14  *    derived from this software without specific prior written permission
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.2/sys/i386/ibcs2/ibcs2_fcntl.c 331722 2018-03-29 02:50:57Z eadler $");
   30 
   31 #include "opt_spx_hack.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/capsicum.h>
   36 #include <sys/fcntl.h>
   37 #include <sys/file.h>
   38 #include <sys/filedesc.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mutex.h>
   42 #include <sys/syscallsubr.h>
   43 #include <sys/sysproto.h>
   44 #include <sys/ttycom.h>
   45 
   46 #include <i386/ibcs2/ibcs2_fcntl.h>
   47 #include <i386/ibcs2/ibcs2_signal.h>
   48 #include <i386/ibcs2/ibcs2_proto.h>
   49 #include <i386/ibcs2/ibcs2_util.h>
   50 
   51 static void cvt_iflock2flock(struct ibcs2_flock *, struct flock *);
   52 static void cvt_flock2iflock(struct flock *, struct ibcs2_flock *);
   53 static int  cvt_o_flags(int);
   54 static int  oflags2ioflags(int);
   55 static int  ioflags2oflags(int);
   56 
   57 static int
   58 cvt_o_flags(flags)
   59         int flags;
   60 {
   61         int r = 0;
   62 
   63         /* convert mode into NetBSD mode */
   64         if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
   65         if (flags & IBCS2_O_RDWR)   r |= O_RDWR;
   66         if (flags & (IBCS2_O_NDELAY | IBCS2_O_NONBLOCK)) r |= O_NONBLOCK;
   67         if (flags & IBCS2_O_APPEND) r |= O_APPEND;
   68         if (flags & IBCS2_O_SYNC)   r |= O_FSYNC;
   69         if (flags & IBCS2_O_CREAT)  r |= O_CREAT;
   70         if (flags & IBCS2_O_TRUNC)  r |= O_TRUNC /* | O_CREAT ??? */;
   71         if (flags & IBCS2_O_EXCL)   r |= O_EXCL;
   72         if (flags & IBCS2_O_RDONLY) r |= O_RDONLY;
   73         if (flags & IBCS2_O_PRIV)   r |= O_EXLOCK;
   74         if (flags & IBCS2_O_NOCTTY) r |= O_NOCTTY;
   75         return r;
   76 }
   77 
   78 static void
   79 cvt_flock2iflock(flp, iflp)
   80         struct flock *flp;
   81         struct ibcs2_flock *iflp;
   82 {
   83         switch (flp->l_type) {
   84         case F_RDLCK:
   85                 iflp->l_type = IBCS2_F_RDLCK;
   86                 break;
   87         case F_WRLCK:
   88                 iflp->l_type = IBCS2_F_WRLCK;
   89                 break;
   90         case F_UNLCK:
   91                 iflp->l_type = IBCS2_F_UNLCK;
   92                 break;
   93         }
   94         iflp->l_whence = (short)flp->l_whence;
   95         iflp->l_start = (ibcs2_off_t)flp->l_start;
   96         iflp->l_len = (ibcs2_off_t)flp->l_len;
   97         iflp->l_sysid = flp->l_sysid;
   98         iflp->l_pid = (ibcs2_pid_t)flp->l_pid;
   99 }
  100 
  101 #ifdef DEBUG_IBCS2
  102 static void
  103 print_flock(struct flock *flp)
  104 {
  105   printf("flock: start=%x len=%x pid=%d type=%d whence=%d\n",
  106          (int)flp->l_start, (int)flp->l_len, (int)flp->l_pid,
  107          flp->l_type, flp->l_whence);
  108 }
  109 #endif
  110 
  111 static void
  112 cvt_iflock2flock(iflp, flp)
  113         struct ibcs2_flock *iflp;
  114         struct flock *flp;
  115 {
  116         flp->l_start = (off_t)iflp->l_start;
  117         flp->l_len = (off_t)iflp->l_len;
  118         flp->l_pid = (pid_t)iflp->l_pid;
  119         switch (iflp->l_type) {
  120         case IBCS2_F_RDLCK:
  121                 flp->l_type = F_RDLCK;
  122                 break;
  123         case IBCS2_F_WRLCK:
  124                 flp->l_type = F_WRLCK;
  125                 break;
  126         case IBCS2_F_UNLCK:
  127                 flp->l_type = F_UNLCK;
  128                 break;
  129         }
  130         flp->l_whence = iflp->l_whence;
  131         flp->l_sysid = iflp->l_sysid;
  132 }
  133 
  134 /* convert iBCS2 mode into NetBSD mode */
  135 static int
  136 ioflags2oflags(flags)
  137         int flags;
  138 {
  139         int r = 0;
  140         
  141         if (flags & IBCS2_O_RDONLY) r |= O_RDONLY;
  142         if (flags & IBCS2_O_WRONLY) r |= O_WRONLY;
  143         if (flags & IBCS2_O_RDWR) r |= O_RDWR;
  144         if (flags & IBCS2_O_NDELAY) r |= O_NONBLOCK;
  145         if (flags & IBCS2_O_APPEND) r |= O_APPEND;
  146         if (flags & IBCS2_O_SYNC) r |= O_FSYNC;
  147         if (flags & IBCS2_O_NONBLOCK) r |= O_NONBLOCK;
  148         if (flags & IBCS2_O_CREAT) r |= O_CREAT;
  149         if (flags & IBCS2_O_TRUNC) r |= O_TRUNC;
  150         if (flags & IBCS2_O_EXCL) r |= O_EXCL;
  151         if (flags & IBCS2_O_NOCTTY) r |= O_NOCTTY;
  152         return r;
  153 }
  154 
  155 /* convert NetBSD mode into iBCS2 mode */
  156 static int
  157 oflags2ioflags(flags)
  158         int flags;
  159 {
  160         int r = 0;
  161         
  162         if (flags & O_RDONLY) r |= IBCS2_O_RDONLY;
  163         if (flags & O_WRONLY) r |= IBCS2_O_WRONLY;
  164         if (flags & O_RDWR) r |= IBCS2_O_RDWR;
  165         if (flags & O_NDELAY) r |= IBCS2_O_NONBLOCK;
  166         if (flags & O_APPEND) r |= IBCS2_O_APPEND;
  167         if (flags & O_FSYNC) r |= IBCS2_O_SYNC;
  168         if (flags & O_NONBLOCK) r |= IBCS2_O_NONBLOCK;
  169         if (flags & O_CREAT) r |= IBCS2_O_CREAT;
  170         if (flags & O_TRUNC) r |= IBCS2_O_TRUNC;
  171         if (flags & O_EXCL) r |= IBCS2_O_EXCL;
  172         if (flags & O_NOCTTY) r |= IBCS2_O_NOCTTY;
  173         return r;
  174 }
  175 
  176 int
  177 ibcs2_open(td, uap)
  178         struct thread *td;
  179         struct ibcs2_open_args *uap;
  180 {
  181         struct proc *p;
  182         char *path;
  183         int flags, noctty, ret;
  184 
  185         p = td->td_proc;
  186         noctty = uap->flags & IBCS2_O_NOCTTY;
  187         flags = cvt_o_flags(uap->flags);
  188         if (uap->flags & O_CREAT)
  189                 CHECKALTCREAT(td, uap->path, &path);
  190         else
  191                 CHECKALTEXIST(td, uap->path, &path);
  192         ret = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE, flags, uap->mode);
  193 
  194 #ifdef SPX_HACK
  195         if (ret == ENXIO) {
  196                 if (!strcmp(path, "/compat/ibcs2/dev/spx"))
  197                         ret = spx_open(td);
  198                 free(path, M_TEMP);
  199         } else
  200 #endif /* SPX_HACK */
  201         free(path, M_TEMP);
  202         PROC_LOCK(p);
  203         if (!ret && !noctty && SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
  204                 cap_rights_t rights;
  205                 struct file *fp;
  206                 int error;
  207 
  208                 error = fget(td, td->td_retval[0],
  209                     cap_rights_init(&rights, CAP_IOCTL), &fp);
  210                 PROC_UNLOCK(p);
  211                 if (error)
  212                         return (EBADF);
  213 
  214                 /* ignore any error, just give it a try */
  215                 if (fp->f_type == DTYPE_VNODE)
  216                         fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, td->td_ucred,
  217                             td);
  218                 fdrop(fp, td);
  219         } else
  220                 PROC_UNLOCK(p);
  221         return ret;
  222 }
  223 
  224 int
  225 ibcs2_creat(td, uap)
  226         struct thread *td;  
  227         struct ibcs2_creat_args *uap;
  228 {
  229         char *path;
  230         int error;
  231 
  232         CHECKALTCREAT(td, uap->path, &path);
  233         error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
  234             O_WRONLY | O_CREAT | O_TRUNC, uap->mode);
  235         free(path, M_TEMP);
  236         return (error);
  237 }       
  238 
  239 int
  240 ibcs2_access(td, uap)
  241         struct thread *td;
  242         struct ibcs2_access_args *uap;
  243 {
  244         char *path;
  245         int error;
  246 
  247         CHECKALTEXIST(td, uap->path, &path);
  248         error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE, 0, uap->amode);
  249         free(path, M_TEMP);
  250         return (error);
  251 }
  252 
  253 int
  254 ibcs2_fcntl(td, uap)
  255         struct thread *td;
  256         struct ibcs2_fcntl_args *uap;
  257 {
  258         intptr_t arg;
  259         int error;
  260         struct flock fl;
  261         struct ibcs2_flock ifl;
  262 
  263         arg = (intptr_t)uap->arg;
  264         switch(uap->cmd) {
  265         case IBCS2_F_DUPFD:
  266                 return (kern_fcntl(td, uap->fd, F_DUPFD, arg));
  267         case IBCS2_F_GETFD:
  268                 return (kern_fcntl(td, uap->fd, F_GETFD, arg));
  269         case IBCS2_F_SETFD:
  270                 return (kern_fcntl(td, uap->fd, F_SETFD, arg));
  271         case IBCS2_F_GETFL:
  272                 error = kern_fcntl(td, uap->fd, F_GETFL, arg);
  273                 if (error)
  274                         return error;
  275                 td->td_retval[0] = oflags2ioflags(td->td_retval[0]);
  276                 return error;
  277         case IBCS2_F_SETFL:
  278                 return (kern_fcntl(td, uap->fd, F_SETFL,
  279                     ioflags2oflags(arg)));
  280 
  281         case IBCS2_F_GETLK:
  282             {
  283                 error = copyin((caddr_t)uap->arg, (caddr_t)&ifl,
  284                                ibcs2_flock_len);
  285                 if (error)
  286                         return error;
  287                 cvt_iflock2flock(&ifl, &fl);
  288                 error = kern_fcntl(td, uap->fd, F_GETLK, (intptr_t)&fl);
  289                 if (error)
  290                         return error;
  291                 cvt_flock2iflock(&fl, &ifl);
  292                 return copyout((caddr_t)&ifl, (caddr_t)uap->arg,
  293                                ibcs2_flock_len);
  294             }
  295 
  296         case IBCS2_F_SETLK:
  297             {
  298                 error = copyin((caddr_t)uap->arg, (caddr_t)&ifl,
  299                                ibcs2_flock_len);
  300                 if (error)
  301                         return error;
  302                 cvt_iflock2flock(&ifl, &fl);
  303                 return (kern_fcntl(td, uap->fd, F_SETLK, (intptr_t)&fl));
  304             }
  305 
  306         case IBCS2_F_SETLKW:
  307             {
  308                 error = copyin((caddr_t)uap->arg, (caddr_t)&ifl,
  309                                ibcs2_flock_len);
  310                 if (error)
  311                         return error;
  312                 cvt_iflock2flock(&ifl, &fl);
  313                 return (kern_fcntl(td, uap->fd, F_SETLKW, (intptr_t)&fl));
  314             }
  315         }
  316         return ENOSYS;
  317 }

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