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/svr4/svr4_util.h

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    1 /*-
    2  * Copyright (c) 1998 Mark Newton
    3  * Copyright (c) 1994 Christos Zoulas
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  * 
   28  * $FreeBSD: releng/6.3/sys/compat/svr4/svr4_util.h 141486 2005-02-07 21:53:42Z jhb $
   29  */
   30 
   31 #ifndef _SVR4_UTIL_H_
   32 #define _SVR4_UTIL_H_
   33 
   34 /*#include <compat/common/compat_util.h>*/
   35 #include <vm/vm.h>
   36 #include <vm/vm_param.h>
   37 #include <vm/pmap.h>
   38 #include <machine/vmparam.h>
   39 #include <sys/exec.h>
   40 #include <sys/sysent.h>
   41 #include <sys/cdefs.h>
   42 #include <sys/uio.h>
   43 
   44 #ifdef DEBUG_SVR4
   45 #define DPRINTF(a)      uprintf a;
   46 #else
   47 #define DPRINTF(a)
   48 #endif
   49 
   50 
   51 static __inline caddr_t stackgap_init(void);
   52 static __inline void *stackgap_alloc(caddr_t *, size_t);
   53 
   54 static __inline caddr_t
   55 stackgap_init()
   56 {
   57 #define szsigcode (*(curthread->td_proc->p_sysent->sv_szsigcode))
   58         return (caddr_t)(((caddr_t)PS_STRINGS) - szsigcode - SPARE_USRSPACE);
   59 }
   60 
   61 static __inline void *
   62 stackgap_alloc(sgp, sz)
   63         caddr_t *sgp;
   64         size_t   sz;
   65 {
   66         void    *p = (void *) *sgp;
   67         sz = ALIGN(sz);
   68         if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode))
   69                 return NULL;
   70         *sgp += sz;
   71         return p;
   72 }
   73 
   74 int     svr4_emul_find(struct thread *, char *, enum uio_seg, char **, int);
   75 
   76 #define CHECKALT(td, upath, pathp, i)                                   \
   77         do {                                                            \
   78                 int _error;                                             \
   79                                                                         \
   80                 _error = svr4_emul_find(td, upath, UIO_USERSPACE, pathp, i); \
   81                 if (*(pathp) == NULL)                                   \
   82                         return (_error);                                \
   83         } while (0)
   84 
   85 #define CHECKALTEXIST(td, upath, pathp) CHECKALT(td, upath, pathp, 0)
   86 #define CHECKALTCREAT(td, upath, pathp) CHECKALT(td, upath, pathp, 1)
   87 
   88 #endif /* !_SVR4_UTIL_H_ */

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