src/runtime/wrap.h

   1 /*
   2  * Data structures used in wrap.c in this directory, moved here from
   3  * wrap.c in November 2007 so that
   4  * src/tools-for-build/grovel-headers.c can grovel the sizes of
   5  * things.
   6  */
   7 #ifndef _SBCL_WRAP_H_
   8 #define _SBCL_WRAP_H_
   9
  10 /* As of 0.6.12, the FFI can't handle 64-bit values. For now, we use
  11  * these munged-to-32-bits values for might-be-64-bit slots of
  12  * stat_wrapper as a workaround, so that at least we can still work
  13  * when values are small.
  14  *
  15  * FIXME: But of course we should fix the FFI so that we can use the
  16  * actual 64-bit values instead.  In fact, we probably have by now
  17  * (2003-10-03) on all working platforms except MIPS and HPPA; if some
  18  * motivated spark would simply fix those, this hack could go away.
  19  * -- CSR, 2003-10-03
  20  *
  21  * Some motivated spark fixed MIPS. -- ths, 2005-10-06 */
  22
  23 /* It would seem as though the FFI would have to be able to handle
  24  * 64-bit values in order for the LARGEFILE && !MIPS case below to
  25  * work, so can the comment above still be right? If FFI can only
  26  * handle 64-bit aliens on some platforms, maybe there should be a
  27  * distinct Lisp feature for 64-bit aliens support? -- RMK,
  28  * 2007-11-14
  29  *
  30  * In any case, since the types defined here exist to give sizes to
  31  * potentially munged or faked data in our stat wrapper, these
  32  * shouldn't be used for any purpose for which the real type can be
  33  * employed. */
  34
  35 #include "sbcl.h"
  36
  37 /* We use an extra layer of aliasing because Linux/MIPS struct stat
  38    doesn't use dev_t. This type is not defined on the Lisp side. */
  39 #ifdef LISP_FEATURE_MIPS
  40 typedef unsigned long aliased_dev_t;
  41 #else
  42 typedef dev_t aliased_dev_t;
  43 #endif
  44
  45 #if defined(LISP_FEATURE_LARGEFILE) || defined(LISP_FEATURE_DARWIN)
  46 typedef aliased_dev_t wst_dev_t;
  47 typedef off_t wst_off_t;
  48 #else
  49 /* These wrappers shouldn't exist, and since pulling in runtime.h caused
  50  * problems on Win32, we don't use the u32 typedef. */
  51 typedef unsigned int wst_dev_t; /* since Linux dev_t can be 64 bits */
  52 typedef unsigned int wst_off_t; /* since OpenBSD 2.8 st_size is 64 bits */
  53 #endif
  54
  55 #ifdef LISP_FEATURE_OS_PROVIDES_BLKSIZE_T
  56 typedef blksize_t wst_blksize_t;
  57 typedef blkcnt_t wst_blkcnt_t;
  58 #else
  59 typedef unsigned long wst_blksize_t;
  60 typedef unsigned long wst_blkcnt_t;
  61 #endif
  62
  63 #ifdef LISP_FEATURE_WIN32 /* Win32 lacks nlink_t, st_uid, st_gid.*/
  64 typedef short wst_nlink_t;
  65 typedef short wst_uid_t;
  66 typedef short wst_gid_t;
  67 #else
  68 typedef nlink_t wst_nlink_t;
  69 typedef uid_t wst_uid_t;
  70 typedef gid_t wst_gid_t;
  71 #endif
  72
  73 /* a representation of stat(2) results which doesn't depend on CPU or OS */
  74 struct stat_wrapper {
  75     /* KLUDGE: The verbose wrapped_st_ prefixes are to protect us from
  76      * the C preprocessor as wielded by the fiends of OpenBSD, who do
  77      * things like
  78      *    #define st_atime        st_atimespec.tv_sec
  79      * I remember when I was young and innocent, I read about how the
  80      * C preprocessor isn't to be used to globally munge random
  81      * lowercase symbols like this, because things like this could
  82      * happen, and I nodded sagely. But now I know better.:-| This is
  83      * another entry for Dan Barlow's ongoing episodic rant about C
  84      * header files, I guess.. -- WHN 2001-05-10 */
  85     wst_dev_t     wrapped_st_dev;         /* device */
  86     ino_t         wrapped_st_ino;         /* inode */
  87     mode_t        wrapped_st_mode;        /* protection */
  88     wst_nlink_t   wrapped_st_nlink;       /* number of hard links */
  89     wst_uid_t     wrapped_st_uid;         /* user ID of owner */
  90     wst_gid_t     wrapped_st_gid;         /* group ID of owner */
  91     wst_dev_t     wrapped_st_rdev;        /* device type (if inode device) */
  92     wst_off_t     wrapped_st_size;        /* total size, in bytes */
  93     wst_blksize_t wrapped_st_blksize;     /* blocksize for filesystem I/O */
  94     wst_blkcnt_t  wrapped_st_blocks;      /* number of blocks allocated */
  95     time_t        wrapped_st_atime;       /* time_t of last access */
  96     time_t        wrapped_st_mtime;       /* time_t of last modification */
  97     time_t        wrapped_st_ctime;       /* time_t of last change */
  98 };
  99
 100 #endif /* _SBCL_WRAP_H_ */