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/compat/linux/linux_util.c

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    1 /*-
    2  * Copyright (c) 1994 Christos Zoulas
    3  * Copyright (c) 1995 Frank van der Linden
    4  * Copyright (c) 1995 Scott Bartram
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  *      from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: src/sys/compat/linux/linux_util.c,v 1.26.2.2 2005/04/23 21:56:04 ps Exp $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/lock.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mutex.h>
   39 #include <sys/namei.h>
   40 #include <sys/proc.h>
   41 #include <sys/syscallsubr.h>
   42 #include <sys/systm.h>
   43 #include <sys/vnode.h>
   44 
   45 #include <machine/stdarg.h>
   46 
   47 #include <compat/linux/linux_util.h>
   48 
   49 const char      linux_emul_path[] = "/compat/linux";
   50 
   51 /*
   52  * Search an alternate path before passing pathname arguments on
   53  * to system calls. Useful for keeping a separate 'emulation tree'.
   54  *
   55  * If cflag is set, we check if an attempt can be made to create
   56  * the named file, i.e. we check if the directory it should
   57  * be in exists.
   58  */
   59 int
   60 linux_emul_find(td, sgp, path, pbuf, cflag)
   61         struct thread    *td;
   62         caddr_t          *sgp;          /* Pointer to stackgap memory */
   63         char             *path;
   64         char            **pbuf;
   65         int               cflag;
   66 {
   67         char *newpath;
   68         size_t sz;
   69         int error;
   70 
   71         error = linux_emul_convpath(td, path, (sgp == NULL) ? UIO_SYSSPACE :
   72             UIO_USERSPACE, &newpath, cflag);
   73         if (newpath == NULL)
   74                 return (error);
   75 
   76         if (sgp == NULL) {
   77                 *pbuf = newpath;
   78                 return (error);
   79         }
   80 
   81         sz = strlen(newpath);
   82         *pbuf = stackgap_alloc(sgp, sz + 1);
   83         if (*pbuf != NULL)
   84                 error = copyout(newpath, *pbuf, sz + 1);
   85         else
   86                 error = ENAMETOOLONG;
   87         free(newpath, M_TEMP);
   88 
   89         return (error);
   90 }
   91 
   92 int
   93 linux_emul_convpath(td, path, pathseg, pbuf, cflag)
   94         struct thread    *td;
   95         char             *path;
   96         enum uio_seg      pathseg;
   97         char            **pbuf;
   98         int               cflag;
   99 {
  100 
  101         return (kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
  102                 cflag));
  103 }
  104 
  105 void
  106 linux_msg(const struct thread *td, const char *fmt, ...)
  107 {
  108         va_list ap;
  109         struct proc *p;
  110 
  111         p = td->td_proc;
  112         printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
  113         va_start(ap, fmt);
  114         vprintf(fmt, ap);
  115         va_end(ap);
  116         printf("\n");
  117 }

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