db2/os/os_stat.c

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1997, 1998
   5  *      Sleepycat Software.  All rights reserved.
   6  */
   7
   8 #include "config.h"
   9
  10 #ifndef lint
  11 static const char sccsid[] = "@(#)os_stat.c     10.15 (Sleepycat) 4/27/98";
  12 #endif /* not lint */
  13
  14 #ifndef NO_SYSTEM_INCLUDES
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17
  18 #include <errno.h>
  19 #endif
  20
  21 #include "db_int.h"
  22
  23 /*
  24  * __os_exists --
  25  *      Return if the file exists.
  26  *
  27  * PUBLIC: int __os_exists __P((const char *, int *));
  28  */
  29 int
  30 __os_exists(path, isdirp)
  31         const char *path;
  32         int *isdirp;
  33 {
  34         struct stat sb;
  35
  36         if (stat(path, &sb) != 0)
  37                 return (errno);
  38
  39 #if !defined(S_ISDIR) || defined(STAT_MACROS_BROKEN)
  40 #if defined(_WIN32) || defined(WIN16)
  41 #define S_ISDIR(m)      (_S_IFDIR & (m))
  42 #else
  43 #define S_ISDIR(m)      (((m) & 0170000) == 0040000)
  44 #endif
  45 #endif
  46         if (isdirp != NULL)
  47                 *isdirp = S_ISDIR(sb.st_mode);
  48
  49         return (0);
  50 }
  51
  52 /*
  53  * __os_ioinfo --
  54  *      Return file size and I/O size; abstracted to make it easier
  55  *      to replace.
  56  *
  57  * PUBLIC: int __os_ioinfo
  58  * PUBLIC:    __P((const char *, int, u_int32_t *, u_int32_t *, u_int32_t *));
  59  */
  60 int
  61 __os_ioinfo(path, fd, mbytesp, bytesp, iosizep)
  62         const char *path;
  63         int fd;
  64         u_int32_t *mbytesp, *bytesp, *iosizep;
  65 {
  66         struct stat sb;
  67
  68         COMPQUIET(path, NULL);
  69
  70         if (fstat(fd, &sb) == -1)
  71                 return (errno);
  72
  73         /* Return the size of the file. */
  74         if (mbytesp != NULL)
  75                 *mbytesp = sb.st_size / MEGABYTE;
  76         if (bytesp != NULL)
  77                 *bytesp = sb.st_size % MEGABYTE;
  78
  79         /*
  80          * Return the underlying filesystem blocksize, if available.
  81          *
  82          * XXX
  83          * Check for a 0 size -- HP's MPE architecture has st_blksize,
  84          * but it's always 0.
  85          */
  86 #ifdef HAVE_ST_BLKSIZE
  87         if (iosizep != NULL && (*iosizep = sb.st_blksize) == 0)
  88                 *iosizep = DB_DEF_IOSIZE;
  89 #else
  90         if (iosizep != NULL)
  91                 *iosizep = DB_DEF_IOSIZE;
  92 #endif
  93         return (0);
  94 }